WO2014019277A1 - Draw bar box - Google Patents

Description

 Trolley case

 The present invention relates to everyday articles, and more particularly to a trolley case. Background technique

 With the development of modern economy and commerce, people often travel to other places or travel, and carry more items while traveling or traveling. In order to save energy during long-distance journeys, people generally use trolley bags to hold luggage items; because the trolley case not only has a large volume for placing items, but also has wheels on the bottom of the box, and there are pull rods on the box, the user can The box can be freely towed by the lever, which is convenient to carry and saves time and effort. The inside of the trolley case of the prior art is generally supported by a steel frame, which causes the overall weight of the trolley case to be heavy, which increases the overall weight of the luggage; and in the long distance journey, even if the weight is increased, the people will consume more. At the same time, when riding the plane, if the weight of the bag itself is close to the weight carried, the weight of the trolley case will be overweight and cause a lot of trouble.

Summary of the invention

 In view of the above, it is an object of the present invention to provide a trolley case which is capable of minimizing its own weight without substantially reducing the load carrying capacity, thereby making it more labor-saving and convenient to use.

Based on the above object, the present invention provides a trolley case which is basically composed of a drawbar base, a telescopic pull rod which can be retracted into the pull rod seat, a chassis with a pull rod assembly positioning hole, a wheel and a box body; the top end of the pull rod base is connected a bottom end of the telescopic pull rod, the bottom end of the draw rod base is fixed in the pull rod assembly positioning hole; the wheel is fixed under the chassis; at least one opening is disposed on the chassis; a reinforcing rib is disposed on the inner surface; the box is disposed on the chassis and includes a fixing frame supporting the outline of the box and a peripheral material surrounding the fixing frame, the peripheral material further wrapping the rod seat, the The telescopic pull rod and the chassis are fixed in the peripheral material by stitching and are located at both sides of the box. Optionally, the reinforcing rib comprises at least one transverse reinforcing rib, at least one longitudinal reinforcing rib perpendicular to the transverse reinforcing rib, and an angle of 15 to 75° with the transverse reinforcing rib or the longitudinal reinforcing rib An oblique reinforcing rib, wherein the lateral direction refers to a left-right direction of the chassis, and is also a longitudinal direction; and the longitudinal direction refers to a front-rear direction of the chassis, which is also a width direction.

 Optionally, two sides of each of the tie rod assembly positioning holes on the chassis are respectively provided with longitudinal reinforcing ribs connected to the bottom end of the rod positioning holes; and/or two on the chassis At least one longitudinal reinforcing rib is disposed between the positioning holes; and/or at least one longitudinal reinforcing rib is disposed between the longitudinal edge of the chassis and the adjacent positioning hole of the tie rod assembly.

 Optionally, at least two longitudinal reinforcing ribs are disposed between the longitudinal edge of the chassis and the adjacent positioning hole of the tie rod assembly, and a diagonal is disposed between the adjacent at least two longitudinal reinforcing ribs And a diagonal stiffener is disposed between the two longitudinal stiffeners connecting the bottom ends of each of the tie rod assembly positioning holes.

 Optionally, 2-5 longitudinal reinforcing ribs are disposed between the positioning holes of the two tie rod assemblies, and the reinforcing ribs may be evenly distributed or unevenly distributed; and/or any one of the pulling rods may be There are 2-5 longitudinal reinforcing ribs between the positioning holes and the adjacent longitudinal edges of the bottom plate, and the reinforcing ribs may be evenly distributed or unevenly distributed.

 Optionally, there are 3-8 lateral reinforcing ribs between the front and rear edges of the chassis, and the lateral reinforcing ribs may be evenly distributed or unevenly distributed.

 Optionally, the at least one opening is disposed in a rectangular or triangular region formed by the longitudinal reinforcing ribs, the lateral reinforcing ribs and the diagonal reinforcing ribs intersecting each other, and the shape of the opening is selected from a circle and an ellipse. Any of shapes, rectangles, diamonds, trapezoids, and stars.

 Optionally, the rib height is 2-20 mm.

 Optionally, the rib height is selected from any one of 2-4 mm, 4-6 mm, 6-8 mm, 8- 10 mm, 10- 12 mm, 12-14 mm, 14-16 mm, 16-18 mm, and 18-20 mm. One or a combination thereof.

 Optionally, the angle between the diagonal stiffener and the transverse stiffener or the longitudinal stiffener is 40°-50°.

 Optionally, the chassis includes a bottom plate and a front side plate and a rear side plate extending upward at the front and rear edges of the bottom plate, and the connecting portions of the front side plate and the rear side plate and the bottom plate are rounded Arc shape.

 Optionally, there are left and right side plates extending vertically upward at the left and right edges of the bottom plate.

Optionally, the box is fixed to the chassis by stitching or riveting. Optionally, the fixing frame fixed in the peripheral material is a rounded rectangular ring or a rounded trapezoidal ring.

 Optionally, the fixing frame is wound by a wire having a diameter of l~3 mm, wherein the wire is selected from the group consisting of a steel wire and an alloy wire, wherein the alloy is selected from the group consisting of an aluminum alloy, a magnesium alloy, a titanium alloy, a tungsten alloy, and Any one or combination of zirconium alloys.

 Optionally, the chassis and the reinforcing rib are made of a plastic material, a fiber reinforced composite material or a metal material, wherein the plastic material is selected from the group consisting of polypropylene, acrylonitrile-butadiene-styrene copolymer, and benzene. An ethylene-acrylonitrile copolymer, impact-resistant polystyrene, polycarbonate, polyoxymethylene, and polyphenylene ether; the fiber-reinforced composite material is selected from the group consisting of a carbon fiber reinforced composite material and a glass fiber reinforced composite material; and the metal material It is selected from the group consisting of aluminum alloys, magnesium alloys, and titanium alloys, wherein the chassis and the reinforcing ribs are made of the same or different materials.

 Optionally, the peripheral material of the box is made of Oxford cloth.

 Optionally, the bottom plate is a wave-shaped plate, and/or the front side plate, the rear side plate, the left side plate and/or the right side plate are wavy plates.

 Optionally, the area of the opening is 10%-80% of the total area of the chassis.

 Optionally, the ratio of the area of the opening to the total area of the chassis is 50%-80%.

 As can be seen from the above, the trolley case provided by the present invention adopts a lightweight structural design that reduces the weight of the structure, and at the same time adopts a lighter weight material, so that the weight of the trolley case is greatly reduced, and the use of the trolley case is improved. Comfort and convenience. At the same time, the strength, durability and service life of the trolley case provided by the invention can also meet the requirements of people. DRAWINGS

 1 is a schematic structural view of a prior art trolley frame assembly;

 2 is a schematic structural view of a skeleton of a trolley case according to an embodiment of the present invention;

 Figure 3 is an enlarged schematic view of A of Figure 2;

 Figure 4 is an enlarged view of the chassis of Figure 2;

 Figure 5 is a schematic diagram of an optional layout scheme of the rib reinforcement of the trolley case of the present invention

 Figure 6 is an enlarged view of B at Fig. 2;

 Figure 7 is a schematic overall view of a trolley case in accordance with one embodiment of the present invention. detailed description

In order to make the objects, technical solutions and advantages of the present invention more clear, the following specific combinations The invention will now be described in further detail with reference to the accompanying drawings.

 FIG. 1 is a schematic structural view of a prior art trolley frame assembly. Including the tie rod assembly 1, the chassis 2, the box frame 3, the wheel 4. Wherein, the pull rod assembly 1 is retractable; the chassis 2 is a rectangular disc, and the inner surface of the chassis 2 is provided with reinforcing ribs; the box frame 3 is a rectangular frame, which is equal to the chassis 2, and the two lengths of the box frame 3 The lower end of the side is fixed on the chassis 2, and the rectangular surface of the box frame 3 is parallel to the tie rod assembly 1; the wheel 4 is provided with four, which are both universal wheels. In the assembled state, the wheel 4 is located at the bottom of the chassis 2, and the case is enclosed outside the case frame 3 and fixed to the tie bar assembly 1. When you do not need to drag the trolley case, press the handle on the top of the lever assembly 1 to retract the lever. The larger size trolley case of the prior art generally has a weight of 2.5kg-3kg.

 2 is a schematic structural view of a skeleton of a trolley case according to an embodiment of the present invention. Including tie rod assembly

21, chassis 22, wheels 23. The pull rod assembly 21 includes a pull rod base 211, a telescopic pull rod 212, a horizontal bar 213, and a handle 214. The wheel 23 includes two front wheels 231 and two rear wheels 232. In order to reduce the weight, the box frame of the present embodiment does not include a box frame.

The rod holder 211 comprises two tubes arranged in parallel, the lower end of which is fixed in the positioning hole of the rod assembly on the chassis 22, the top end of the rod holder 211 is connected with the bottom end of the telescopic rod 212; the tops of the two tubes parallel to the rod holder 211 They are respectively fixed to both ends of the horizontal bar 213. The telescopic pull rod 212 includes a first-stage telescopic tube 2121 and a second-stage telescopic tube 2122. The first-stage telescopic tube 2121 is slightly thicker than the second-stage telescopic tube 2122. The bottom end of the first-stage telescopic tube 2121. The top end of the second stage telescopic tube 2122 is connected to the top end of the first stage telescopic tube 2121. and can be retracted into the thick tube and can be positioned at the top end and the bottom end of the first stage telescopic tube 2121. The entire telescopic pull rod 212 can be retracted into the rod holder 211 or telescopically slid in the rod holder 211, and can be positioned at the positions of the top end and the bottom end of the rod holder 211. The handle 214 is fixed to the top end of the telescopic pull rod 212. The handle 214 is provided with a spring button. When the spring button is not pressed, the position of the telescopic pull rod 212 is locked at the top end or the bottom end of the rod base 211, and the second stage telescopic tube of the telescopic pull rod 212 The 2122 position is locked at the top end or the bottom end of the first stage telescopic tube 2121; when the spring button is pressed, the current fixed position of the telescopic pull rod 212 and the second stage telescopic tube 2122 of the telescopic pull rod 212 is unlocked, and the user can push the handle to make the telescopic The pull rod 212 contracts or causes the telescopic pull rod 212 to retract into the pull rod seat 211. The cross-sectional shape of the drawbar base 211, the first-stage telescopic tube 2121, and the second-stage telescopic tube 2122 may be the same or different, and the optional shapes are rectangular, circular, elliptical, triangular, etc.; in this embodiment, the drawbar The seat 211, the first stage telescopic tube 2121, and the second stage telescopic tube 2122 have the same cross-sectional shape and are substantially oblate. 3 is an enlarged view of A of FIG. 2, reflecting the cross section of the tie rod seat 211, the first stage telescopic tube 2121, and the second stage telescopic tube 2122. Face shape.

 Both the rod holder 211 and the telescopic rod 212 may be made of stainless steel, or may be made of other lightweight metals such as alloy or fiber reinforced composite materials; specifically, the alloy may be aluminum alloy, magnesium alloy or titanium alloy. , a tungsten alloy or a zirconium alloy, etc.; the fiber reinforced composite material may be a carbon fiber reinforced composite material or a glass fiber reinforced composite material. In the present embodiment, the drawbar base 211 and the telescopic pull rod 212 are made of aluminum alloy and have a thickness of not more than 1 mm, so that the drawbar assembly 21 is light in weight, good in strength, and easy to be surface-treated. Specifically, the aluminum alloy may be an aluminum silicon alloy, an aluminum copper alloy, an aluminum magnesium alloy, an aluminum zinc alloy or an aluminum rare earth alloy. Further, the thickness of the aluminum alloy tube for the tie rod holder 211 and the telescopic rod 212 is about 0.5 mm.

 The bar 213 and the handle 214 are made of a lightweight, strong material such as a plastic, resin or fiber reinforced composite; the plastic may be PP (polypropylene), ABS (acrylonitrile butadiene styrene) Copolymer), AS (styrene-acrylonitrile copolymer) or HIPS (impact resistant polystyrene), etc.; the fiber-reinforced composite material may be a carbon fiber reinforced composite material or a glass fiber reinforced composite material. The materials used for the bar 213 and the handle 214 may be the same or different. PP plastic is one of the lightest hard plastics. PP plastic is the preferred material because it has a lower density than ABS plastic, AS plastic, HIPS plastic and has sufficient strength. Therefore, in this embodiment, the horizontal bar 213 is made of PP plastic, and the handle 214 is also made of PP plastic.

 The front wheel 231 and the rear wheel 232 are both universal wheels, and the wheels 23 are respectively fixed to the four corners of the chassis 22 by fasteners, the front wheel 231 is next to the two corners of the lower part of the front side plate 223, and the rear wheel 232 is tight. The two corners of the lower part of the rear side plate 224 are next to each other. Alternatively, it is also possible to provide at least two rear wheels below the chassis, the rear wheels being universal wheels; and one or a set of support legs at the bottom of the chassis and in front of the rear wheels. As an alternative, wheels other than the universal wheel can also be used, and the number of wheels can be determined according to design needs.

 3 is a partial enlarged view of the portion A of FIG. 2, showing the cross-sectional shape of the first-stage telescopic tube 2121. In this embodiment, the cross-section of the rod holder 211, the first-stage extension tube 2121, and the second-stage extension tube 2122 The shape is the same, consisting of two identical arcs and two straight lines tangent to the arc. The cross-sectional shape of the corresponding tie rod assembly positioning hole 221 is the same as that of the tie rod holder 211. The use of such an oblate rod can meet the strength requirements of the tie rod and reduce the material of the tie rod, thereby reducing the weight of the tie rod.

Figure 4 is an enlarged view of the chassis of Figure 2 showing the detailed structure of the chassis. In this embodiment, the chassis 22 includes two tie rod assembly positioning holes 221, a bottom plate 222, a front side plate 223, a rear side plate 224, and a plurality of Reinforcing rib 225 and opening 226. Reinforcing ribs 225 are provided on the inner surface of the chassis 22 to increase the strength of the chassis 22.

 The tie rod assembly positioning hole 221 on the chassis 22 is fixed to the inner side of the rear side plate 224. The front side panel 223 can be designed as a curved panel. In the present embodiment, the bottom plate 222 can be designed as a wave-shaped plate, so that the thickness of the chassis 22 can be minimized while increasing the strength of the chassis. Alternatively, the bottom plate 222 can also be designed as a flat plate to reduce the cost of mold manufacturing. The bottom plate 222 is generally rectangular in shape, and may be designed as a substantially trapezoidal or a combination of a plurality of differently sized rectangles, and/or the edges may have a circular arc shape. The length of the front side panel 223 and the rear side panel 224 may or may not be equal to the length of the bottom panel 222. The chassis 22 can be integrally molded in one injection at the time of manufacture.

 The bottom end of the drawbar base 211 is wedged into the pull rod assembly positioning hole; the front side plate 223, the rear side plate 224 and the bottom plate 222 have an arc-shaped transition joint; the bottom plate 22 has an upturned edge 227 at the left and right ends.

 The rib 225 is an elongated rib, and its cross section may be any shape, for example, may be selected from a rectangle, a triangle, a trapezoid, a circle, a semicircle, an I-shape, etc.; the rib 225 may be lateral, longitudinal, and/or Or it is fixed obliquely to the inner surface of the chassis 22 to enhance the chassis 22; the length of the ribs 225 may be different. In addition, the ribs 225 may also be parallel or at an angle to the edge of the chassis. In the present embodiment, the rib 225 has a rectangular cross section.

 In an alternative embodiment, the length of the front side panel 223 is different from the length of the bottom panel 222 and/or the length of the rear side panel 224 is different than the length of the bottom panel 222. The wave shape of the chassis 22 may be a smooth wave or sawtooth wave, and the bottom plate 222 and/or the front side plate 223 and/or the rear side plate 224 of the chassis 22 may also be plates or the like provided with a groove shape at the edge. The chassis 22 can also be partially formed by a flat plate, such as a flat plate on the front side plate or a flat plate on the rear side plate or a flat plate on the bottom plate.

 In an alternative embodiment, the front side panel 223, the rear side panel 224, and the ribs 225 may be partially or fully formed separately from the bottom panel 222. For example, after the bottom plate 222 is injection molded, the front side plate 223 and the rear side plate 224 may be respectively fixed to the front and rear edges of the bottom plate 222 by bonding, sewing or riveting; and the tie rod assembly positioning holes 221 are bonded to each other. It is fixed to the inner side of the rear side plate 224 or the like by sewing or riveting. The ribs 225 may be secured to the inner surface of the chassis 22 by gluing, stitching or riveting.

The positioning hole 221, the bottom plate 222, the front side plate 223, the rear side plate 224, and the reinforcing rib 225 may be made of the same material or may be made of different materials. In an alternative embodiment, the locating holes 221, the bottom plate 222, the front side panel 223, the rear side panel 224, and the ribs 225 may all be fabricated from PP plastic. The opening 226 can be disposed at any vacant position on the chassis 22 other than the ribs 225. The shape, size, position and number of the openings 226 can be arbitrarily set on the premise that the strength of the chassis 22 can be ensured. In the present embodiment, the opening 226 includes a circular opening and an elliptical opening.

 The reinforcing rib may include a lateral reinforcing rib extending along the left and right lengthwise directions of the chassis 22, a longitudinal reinforcing rib perpendicular to the lateral reinforcing rib along the chassis 22 and extending in the front-rear width direction, and/or with the lateral reinforcing rib or The longitudinal reinforcing ribs are oblique reinforcing ribs at an angle of an angle. In this embodiment, longitudinal reinforcement ribs 227 connected to the bottom ends of the rod assembly positioning holes 221 are disposed on both sides of each of the tie rod assembly positioning holes 221 on the chassis 22; and two tie rod assemblies on the chassis 22 are positioned. At least one longitudinal reinforcing rib 227 is disposed between the holes 221; two longitudinal reinforcing ribs 227 are respectively disposed between the left and right side edges of the chassis 22 and the adjacent tie rod assembly positioning holes 221, and the two longitudinal reinforcing ribs 227 can be placed at 3 to 10 mm from the left and right side edges of the chassis 22. An oblique reinforcing rib 229 is disposed between the two longitudinal reinforcing ribs 227 closest to the left side edge of the chassis 22; oblique reinforcing ribs 229 are also disposed between the two longitudinal reinforcing ribs 227 closest to the right side edge of the chassis 22. An oblique reinforcing rib 229 is also disposed between the two longitudinal reinforcing ribs 227 connected to the bottom end of each of the tie rod assembly positioning holes 221 .

At least one lateral stiffener 228 may be provided on the chassis 22, for example, lateral stiffeners 228 may be provided at the midpoints of the front and rear edges of the bottom panel 222 and/or quarters and quarters between the front and rear edges of the bottom panel 22 The lateral reinforcing ribs 228 are respectively disposed; the lateral reinforcing ribs 228 may be disposed at the boundary between the bottom plate 22 and the front side plates 223; and the lateral reinforcing ribs 228 are disposed at the boundary between the bottom plate 22 and the rear side plates 224. In an alternative embodiment, the manner in which the lateral reinforcing ribs 228, the longitudinal reinforcing ribs 227, and the diagonal reinforcing ribs 229 are disposed may be arbitrarily combined; the setting between the diagonal reinforcing ribs 229 and the lateral reinforcing ribs 228 or the longitudinal reinforcing ribs 227 The angle may be any angle between 15° and 75°. Specifically, the set angle may be 30°-60°, preferably 40°-50°, and most preferably, the set angle is about 45°, which provides the best reinforcement for the strength of the chassis structure. Additionally, in other embodiments, the longitudinal stiffeners may be provided as follows: longitudinal stiffeners are provided at approximately one-half of the spacing of the tie rod assembly locating holes; and/or approximately three of the spacing of the locating holes in the tie rod assembly One-third, two-thirds are respectively provided with longitudinal reinforcing ribs; and/or approximately one-quarter, two-quarters, three-quarters of the spacing of the positioning holes of the tie rod assemblies are respectively provided with longitudinal reinforcement And ribs; and/or longitudinal ribs are respectively disposed at about one-third, two-thirds of the distance between any one of the tie rod assembly locating holes and the same side edge of the bottom plate; and/or any one of the tie rods Approximately one quarter, two quarters, and three quarters of the distance from the positioning hole to the same side edge of the bottom plate are respectively provided with longitudinal reinforcing ribs; and/or any one of the tie rod assemblies is positioned to the bottom plate About one-fifth, two-fifths, three-fifths, and four-fifths of the distance between the side edges are respectively provided with longitudinal reinforcing ribs. In other embodiments 2-5 longitudinal reinforcing ribs may be disposed between the positioning holes of the tie rod assembly, and the reinforcing ribs may be evenly distributed or unevenly distributed; any one of the pulling rod assemblies may be positioned on the same side of the bottom plate There are 2-5 longitudinal stiffeners between the longitudinal edges, which can be evenly distributed or unevenly distributed. In other embodiments, lateral stiffeners are provided at approximately one-half of the distance between the front and rear edges of the bottom panel; and/or approximately one-third, two-thirds of the distance between the front and rear edges of the bottom panel a transverse stiffener; and/or a transverse stiffener at about a quarter, two quarters, three quarters of the distance between the front and rear edges of the soleplate; and/or about five of the distance between the front and rear edges of the bottom panel One-third, two-fifths, three-fifths, four-fifths with transverse stiffeners; and/or about one-sixth, two-sixth, six-sixth of the distance between the front and rear edges of the bottom plate Three, six-fifths, five-fifths with lateral stiffeners; and/or about one-seventh, two-sevenths, three-sevenths, seven-sevenths of the distance between the front and rear edges of the floor. Seven-fifths and seven-sevenths of them have horizontal reinforcements. In other embodiments, there may be 3-8 lateral stiffeners between the front and rear edges of the chassis, which may be evenly distributed or unevenly distributed.

 The layout of the ribs can also be used in a variety of flexible ways. For example, the ribs shown in Figure 5 can be selected as schematic diagrams. Including rectangular frame ribs, these rectangular frame ribs may be similar rectangles, centered on the midpoint of the chassis or the bottom plate, and the length and width are sequentially increased from the center to the edge, and the ridge is added on the basis of the rectangular frame ribs. Reinforcement. The diagonal stiffeners may be designed to be secured between the rectangular frame stiffeners and along the diagonal of the chassis or base. The rectangular frame ribs may be arranged in 2-6 pieces, may be equally spaced, or may be unequally spaced.

 All of the ribs described in this embodiment have a height of about 2-20 mm.

 In other embodiments, the rib height may be selected from any of 2-4 mm, 4-6 mm, 6-8 mm, 8- 10 mm, 10-12 mm, 12-14 mm, 14-16 mm, 16-18 mm, 18-20 mm. One or a combination thereof.

The ribs are designed to be oriented transversely, longitudinally and at an angled angle, ensuring that the chassis has sufficient strength in all directions. The individual ribs are staggered and a rectangular or triangular area is defined on the chassis 22. In the embodiment, an opening 226 is opened in the rectangular area. According to the aspect ratio of the rectangular region, a circular or elliptical opening may be opened in the rectangular region, and the opening 226 is a through hole penetrating the bottom plate 222. The distance between the edge of the opening 226 and its adjacent reinforcing rib 225 may be 2 mm to 2 cm. For example, an equal-sized elliptical opening may be formed in a rectangular area between the two tie rod assembly positioning holes 221; a circle may be formed on a rectangular area located on the left side and/or the right side of the rod assembly positioning hole 221 Opening; near the front and rear edges of the chassis 22 The area may be smaller than the open area near the centerline of the chassis 22. At the same time, the chassis 22 having the ribs 225 and the opening 226 can reduce the weight of the chassis 22 while meeting the load bearing requirements of the trolley case.

 The chassis and the reinforcing ribs may be made of a plastic material, a fiber reinforced composite material or a metal material, wherein the plastic material may be selected from the group consisting of polypropylene, acrylonitrile-butadiene-styrene (ABS) copolymer, a styrene-acrylonitrile copolymer, impact-resistant polystyrene, polycarbonate, polyoxymethylene, and polyphenylene ether; the fiber-reinforced composite material may be selected from the group consisting of a carbon fiber reinforced composite material and a glass fiber reinforced composite material; The metal material may be selected from the group consisting of aluminum alloys, magnesium alloys, and titanium alloys.

 In an alternative embodiment, the length of the front side panel 223 or the rear side panel 224 may be different from the length of the bottom panel 222, for example, the length of the front side panel 223 is less than the length of the bottom panel 222; or the length of the rear side panel 224 is less than the bottom panel 222. length.

 In an alternative embodiment, a plurality of openings 226 may also be formed in a single rectangular or triangular region formed by staggered ribs, and the spacing between the edges of each opening 226 may be no less than 2 mm.

 A connecting hole is formed at a suitable position on the bottom plate 222, and the wheel 23 can be fixed to the chassis 22 through the connecting hole by a fastening nail or other fastener, and the position of the connecting hole matches the position at which the wheel is fixed.

 After the finished trolley case is completed, the weight of the chassis can be tested by loading heavy objects into the box in a suspended state. The chassis 22 of the present embodiment can be subjected to different weights when manufactured in different sizes. When the size of the chassis 22 is about 45 x 25 mm, the weight it can withstand is about 35 kg. When the weight of the chassis is 23 kg, the chassis does not substantially sag.

 The ratio of the total area of the openings provided on the chassis to the total area of the chassis is about 10%-80%. Preferably, the total area of the openings accounts for about 50% to 80% of the total area of the chassis.

 In order to further reduce the weight, a certain number of holes can be provided on the tie rod holder and the tie rod without affecting the strength.

Fig. 6 is an enlarged view of the portion B of Fig. 2 showing the shape of the right side edge 230 of the chassis 22 in the present embodiment. In this embodiment, the bottom plate 222 is a wave-shaped plate, and the left end edge and the right end edge of the bottom plate 222 have the same shape. In other embodiments, the left and right end edges may also be different. The right end edge 230 shown in FIG. 5 includes a lengthwise convex arcuate edge and a length of a planar edge that is curved toward the inner direction of the bottom plate 222; the planar edge is perpendicular to the bottom plate 222. The rim structure of such a chassis can serve to enhance the strength of the chassis. In other embodiments, the rim 227 can include a length of arcuate surface that curves toward the exterior of the bottom plate 22. 7 is a schematic view of the entire trolley case according to the embodiment of the present invention, showing the state in which the box body 41 in the embodiment is mounted on the frame assembly of the trolley case, wherein the surface on which the telescopic pull rod is located is the back side of the trolley case, and the back side is opposite The surface of the chassis is the front surface of the trolley case; the corresponding surface of the chassis is the bottom surface of the trolley case, the opposite surface of the bottom surface is the top surface of the trolley case; and the other two faces are the sides of the trolley case. Compared with the prior art trolley case, the present invention does not employ a support frame surrounding the entire case, but supports the case by using a fixing frame fixed to the side of the case and surrounded by the peripheral material. The holder is fixed in the peripheral material by stitching and is located at both sides of the box. In this embodiment, the fixing frame is a fixing ring 411. The casing 41 includes two fixed rings 411, a peripheral material 412, and a zipper opening 413. The two fixing rings 411 are respectively located on the left and right sides of the box, and have a substantially rounded trapezoid shape. The retaining ring 411 is sewn into the peripheral material, the lower end of which has a width substantially equal to the width of the chassis 22, the height of which is substantially equal to the height of the drawbar base 211, and the distance between the two retaining rings 411 is substantially equal to the length of the chassis. In the assembled state, the retaining ring 411 is wrapped by the peripheral material 412, so the retaining ring 411 is indicated by a dashed line in FIG.

 The chassis 22 is surrounded by a peripheral material 412 at the bottom of the retaining ring 411, and fasteners or other fasteners are passed through the peripheral material 412 to secure the wheel 23 to the corresponding position of the chassis 22. A zipper opening 413 is disposed on the rear edge of the top surface of the casing 41; the position of the zipper opening 413 corresponds to the position of the rod base 211, and the width thereof is larger than the width of the rod base 211, so that the telescopic rod 212 and the handle of FIG. 214 can protrude from the zipper opening. After the telescopic rod 212 is retracted into the rod base 211, the zipper opening 413 is closed, so that the handle 214 can be protected. At the same time, the zipper opening 413 is also provided to prevent foreign matter from entering the cabinet. The material of the fixing ring 411 and the peripheral material 412 can be selected as needed. For example, the retaining ring 411 can be made of a light-weight, non-deformable metal material or composite material, such as steel wire, alloy wire or rigid composite material; the peripheral material 412 can be selected as a strong, wear-resistant, lightweight fabric. In this embodiment, the fixing ring 411 is a bead ring having a diameter of l-3 mm, and the peripheral material 412 is an Oxford cloth. The bottom surface of the casing 41 is fixed to the chassis 22 by sewing or riveting.

In other embodiments, the retaining ring can be designed in a different shape, such as a rounded rectangle or the like. It is also possible to use a fixing frame, a shaping mesh or the like instead of the fixing ring; in particular, the shaping frame can be formed by two cross-welding wires of the same length, and arc-shaped steel wires are welded at both ends of the steel wire as roundings of the casing; The mesh may be a rounded trapezoidal mesh or a rounded rectangular mesh made of any suitable wire. The case can be fixed in a manner other than stitching or riveting. The fixing ring may be an aluminum alloy ring, a titanium alloy ring or the like. The Oxford fabric used for the outer material can be a set of oxford cloth, full-elastic oxford cloth, For oxford cloth, weft oxford cloth, etc., the outer material can also be made of materials other than oxford, such as canvas, composite fabric, cotton cloth and so on.

 The dimensions of the finished trolley case can be designed according to the needs of the use, and the weight of the finished product of different sizes will also be different. A trolley case made of the structure and material provided in accordance with an embodiment of the present invention, when its size is

At 69x45.8x26.8cm, the weight can be as low as about 1.4kg, while still meeting the structural strength requirements.

 As can be seen from the above, the trolley case provided by the present invention is ingeniously improved from the aspects of structure and material, and the weight of the trolley case is remarkably reduced; the tie rod and the chassis can meet the required strength and can withstand the use. Use the required weight. The box body of the trolley case provided by the invention is made of a fine, firm and light material, and the frame zipper opening is designed to prevent foreign matter from entering the box body and at the same time providing a certain protection to the tie rod.

 The trolley case provided by the invention reduces the weight and reduces the unnecessary burden for the user's journey. At the same time, the trolley case provided by the invention also has sufficient structural strength to satisfy the user carrying the baggage during the journey. demand.

 It should be understood by those skilled in the art that the above description is only the embodiment of the present invention, and is not intended to limit the invention, and any modifications, equivalents, and improvements made within the spirit and principles of the present invention. And so on, should be included in the scope of protection of the present invention.

Claims

Claim 1. A trolley case, which is basically composed of a drawbar base, a telescopic pull rod that can be retracted into the drawbar base, a chassis with a pull rod assembly positioning hole, a wheel, and a box body;  a top end of the pull rod base is connected to a bottom end of the telescopic pull rod, and a bottom end of the pull rod base is fixed in the positioning hole of the pull rod assembly;  The wheel is fixed below the chassis;  Providing at least one opening in the chassis;  a reinforcing rib is disposed on an inner surface of the chassis;  The case is disposed on the chassis and includes a fixing frame supporting the outline of the box and a peripheral material surrounding the fixing frame, the peripheral material further wrapping the rod seat, the telescopic rod and the chassis, The holder is fixed in the peripheral material by stitching and is located at both sides of the box.  2. The trolley case according to claim 1, wherein the reinforcing rib comprises at least one lateral reinforcing rib, at least one longitudinal reinforcing rib perpendicular to the transverse reinforcing rib, and the transverse reinforcing rib or the The longitudinal reinforcing rib is an oblique reinforcing rib having an angle of 15 to 75°, wherein the lateral direction refers to the left-right direction of the chassis and also the longitudinal direction thereof, and the longitudinal direction refers to the front-rear direction of the chassis, and also the width thereof. direction.  3. The trolley case according to claim 2, wherein  Two longitudinal ribs respectively connected to the bottom ends of the locating holes of the pull rod assembly are respectively disposed on two sides of each of the two locating holes of the pull rod assembly on the chassis; and/or  Providing at least one longitudinal reinforcing rib between the two positioning holes on the chassis; and/or at least one of a longitudinal side edge of the chassis and an adjacent positioning hole of the adjacent tie rod assembly Longitudinal reinforcement.  4. The trolley case according to claim 3, wherein at least two longitudinal reinforcing ribs are disposed between the lateral side edges of the chassis and the adjacent tie rod positioning holes, and adjacent to each other An oblique stiffener is disposed between the at least two longitudinal stiffeners; and/or  An oblique rib is disposed between the two longitudinal ribs connecting the bottom ends of each of the tie rod assembly locating holes. The trolley case according to claim 3, wherein 2-5 longitudinal reinforcing ribs are disposed between the positioning holes of the two tie rod assemblies, and the reinforcing ribs may be evenly distributed or unevenly distributed. Cloth; and/or  Between the adjacent longitudinal edges of any one of the tie rod assembly positioning holes and the bottom plate, there are provided 2 to 5 longitudinal reinforcing ribs which may be evenly distributed or unevenly distributed. 6. The trolley case according to claim 3, wherein 3-8 lateral reinforcing ribs are provided between the front and rear edges of the chassis, and the lateral reinforcing ribs may be evenly distributed or unevenly distributed. 7. The trolley case according to claim 2, wherein the at least one opening is disposed in a rectangular or triangular region formed by the longitudinal reinforcing ribs, the lateral reinforcing ribs, and the diagonal reinforcing ribs crossing each other The shape of the opening is selected from any one of a circle, an ellipse, a rectangle, a diamond, a trapezoid, and a star.  The trolley case according to claim 2, wherein an angle between the diagonal reinforcing rib and the lateral reinforcing rib or the longitudinal reinforcing rib is 40°-50°.  9. The trolley case according to claim 1, wherein the chassis includes a bottom plate and a front side plate and a rear side plate extending upward at front and rear edges of the bottom plate, the front side plate and the front side The connecting portion of the rear side plate and the bottom plate has an arc shape.  10. The trolley case according to claim 9, wherein a left side plate and a right side plate extending vertically upward are provided at left and right edges of the bottom plate.  11. The trolley case according to claim 1, wherein the case is fixed to the chassis by stitching or riveting.  12. The trolley case according to claim 1, wherein the fixing frame fixed in the peripheral material is a rounded rectangular ring or a rounded trapezoidal ring.  The trolley case according to claim 12, wherein the fixing frame is wound by a wire having a diameter of l~3 mm, the wire is selected from the group consisting of a steel wire and an alloy wire, wherein the alloy is selected from the group consisting of a steel wire and an alloy wire. Any one or a combination of an aluminum alloy, a magnesium alloy, a titanium alloy, a tungsten alloy, and a zirconium alloy.  The trolley case according to claim 1, wherein the chassis and the reinforcing rib are made of a plastic material, a fiber reinforced composite material or a metal material, wherein the plastic material is selected from the group consisting of polypropylene and propylene. a nitrile-butadiene-styrene copolymer, a styrene-acrylonitrile copolymer, an impact-resistant polystyrene, a polycarbonate, a polyoxymethylene, and a polyphenylene ether; the fiber-reinforced composite material is selected from the group consisting of carbon fiber reinforced composite materials And a glass fiber reinforced composite material; and the metal material is selected from the group consisting of aluminum alloys, magnesium alloys, and titanium alloys, wherein the chassis and the reinforcing ribs are made of the same or different materials. 15. The trolley case according to claim 1, wherein the peripheral material of the case is made of Oxford cloth. 16. The trolley case according to claim 1, wherein the bottom plate is a wave-shaped plate, and/or the front side panel, the rear side panel, the left side panel, and/or the right side The board is a wavy board. The trolley case according to any one of claims 1 to 16, wherein the area of the opening is 10% to 80% of the total area of the chassis. 18. The trolley case according to claim 17, wherein the ratio of the area of the opening to the total area of the chassis is 50% - 80%.