JP5366897B2 - Trolley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carriage which has a simple structure, can be reduced in manufacturing cost and can be operated easily. <P>SOLUTION: The carriage 1 has casters 4 which are attached to the front and back sides and the left and right sides of a base frame 3, and which lock a wheel 22 by energizing a lock member 29 to the lower side with a spring 31 and unlock the wheel by pulling-up a lock member-pulling-up shaft 8 against the spring 31. The casters 4 are attached to the front and back parts of each of left and right longitudinal frames 5 of the base frame 3, an actuation frame 7 is retained freely vertically movably within each longitudinal frame 5, the lock member-pulling-up shaft 8 of each caster 4 is fixed to the actuation frame 7, a pedal shaft 10 to which a pedal 9 is projectingly provided is bridged between front end parts of both longitudinal frames 5, 5, a plurality of cam shafts 11, 12 which are integrally connected with each other are horizontally laid on the back side of the pedal shaft 10, rotors 13 attached to both end parts of each cam shafts 11, 12 are interposed between the longitudinal frame 5 and the actuation frame 7 and a slider crank mechanism 14 is interposed between the pedal shaft 10 and the front side cam shaft 11. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention mainly relates to a bedtop for a hospital room (a table with drawers and cupboards that is used near a hospital bed and is used for a patient's daily necessities or in place of a table), a small locker for a hospital room, etc. In particular, the present invention relates to a carriage in which casters attached to the front, rear, left and right of a base frame are locked and unlocked by operating one pedal.

  Conventionally, various types of carts for mobile beds used in hospitals and the like have been proposed, but these carts are much more complicated in structure, have a large number of parts, and are expensive to manufacture, so they are smaller than beds. Applying it to carts such as bedside beds for hospital rooms and small lockers has been inappropriate due to the high cost of the carts.

  An object of the present invention is to provide a carriage that has a simple structure, has a small number of parts, can be manufactured at low cost, and can be easily locked and unlocked by casters.

Means for solving the above problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 locks the wheel 22 by urging the lock member 29 downward with a spring 31. The caster 4 is attached to the front, rear, left, and right of the base frame 3 by lifting the lock member lifting shaft 8 against the spring 31. The casters 4 are attached to the front and rear portions of the frame 5, and the operation frames 7 for lifting the lock members are held up and down in the respective longitudinal frames 5, and the upper ends of the lock member lifting shafts 8 of the casters 4 are held in the operation frames 7. The pedal shaft 10 with a pedal 9 projecting between the front end portions of the left and right longitudinal frames 5 and 5 is pivoted, and the pedal shaft 10 is integrated with each other at a predetermined interval behind the pedal shaft 10. A plurality of connected camshafts 11 and 12 are horizontally mounted between the left and right longitudinal frames 5 and 5, and a trochanter 13 attached to both ends of each camshaft 11 and 12 is disposed between the longitudinal frame 5 and the operation frame 7. A cam in which a slider crank mechanism 14 is interposed between the pedal shaft 10 and the front cam shaft 11 and each trochanter 13 is provided on the lower surface side of the operating frame 7 in the upward inclined posture of the pedal 9. 15, the operating frame 7 is lifted, thereby lifting the lock member lifting shaft 8 to unlock each caster 4, and depressing the pedal 9, thereby causing each trochanter 13 to protrude from the cam 15. The operating frame 7 is moved down from 16 to the recess 17 and the lock member lifting shaft 8 is pulled down by the urging force of the spring 31 to lock each caster 4.

  According to a second aspect of the present invention, in the carriage according to the first aspect, the left and right longitudinal frames 5 of the base frame 3 are respectively formed from a frame main body portion 19 having a U-shaped cross-section upward and both side wall portions 19 a and 19 a of the frame main body portion 19. It comprises support flange portions 20 and 20 with screw holes 26 projecting horizontally outward, and the operating frame 7 for lifting the lock member is fitted into the frame main body portion 19 of the longitudinal frame 5 so as to be freely raised and lowered. It is formed in the shape of a U-shaped frame with a downward cross-section.

  The effect of the invention by the above-described solution means will be described with reference numerals of the embodiments described later. According to the cart of the invention according to claim 1, the base frame 3 is attached to the front, rear, left and right by depressing the pedal 9. The four casters 4... Can be locked all at once, and all the casters 4... Can be unlocked all at once by kicking up the pedal 9 and tilting upward. . The carriage 1 also includes a base frame 3 equipped with casters 4 on the front, rear, left and right, a pedal shaft 10 laid between the front end portions of the left and right longitudinal frames 5 and 5 of the base frame 3, and both The camshafts 11 and 12 that are horizontally mounted between the longitudinal frames 5 and 5, the slider crank mechanism 14 that is interposed between the pedal shaft 10 and the front camshaft 11, and the longitudinal frames 5 can be raised and lowered freely. And the cam 15 provided on the lower surface side of the operating frame 7, and the trochanter 13 attached to both ends of each of the cam shafts 11 and 12 and moving along the cam 15. Since the structure is simple and the number of parts is small, the manufacturing cost can be reduced, and the caster 4 can be easily locked and unlocked.

  According to the second aspect of the present invention, the left and right longitudinal frames 5 of the base frame 3 are respectively formed horizontally outwardly from the frame main body portion 19 having an upward U-shaped cross section and the side wall portions 19 a and 19 a of the frame main body portion 19. The operating frame 7 for lifting the lock member is formed in a downward-facing cross-section so that it can be raised and lowered into the frame main body 19 of the longitudinal frame 5. It is formed in a frame shape

It is an external appearance perspective view which shows the use condition of the trolley | bogie which concerns on this invention. It is a perspective view which shows the trolley | bogie which concerns on this invention. It is a vertical side view which shows a part of the cart. It is a vertical side view which shows especially a cam, a trochanter, and a slider crank mechanism part of the cart. (a) is the front view of the caster attachment structure part to a trolley | bogie, the state which shows the caster being locked is shown, (b) is the longitudinal section side view. (a) is the front view of the caster attachment structure part to a trolley | bogie, the state which the caster is unlocked is shown, (b) is the longitudinal section side view. (a) is an enlarged cross-sectional view in a state where the caster is locked, (b) is an enlarged cross-sectional view in a state where the caster is unlocked, and (c) is an enlarged perspective view showing a part of the turning lock means of the wheel. It is.

  A preferred embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a cart according to the present invention, 2 is a floor head for a hospital room mounted on the cart 1, and the front of the base body A A door B is housed in the lower part of the side, and drawers C and D are accommodated in the upper part. A shelf E is provided on the upper side of the drawer C. The cart 1 shown in FIG. 2 includes a base frame 3 and four casters 4 which incorporate a lock mechanism as will be described later and are attached to the front, rear, left and right of the base frame 3. The base frame 3 includes a pair of left and right longitudinal frames 5, 5 and a connecting frame 6 that connects the both longitudinal frames 5, 5.

The carriage 1 has casters 4 attached to the front and rear portions of the left and right longitudinal frames 5 constituting the base frame 3, and the long operation members 7 for lifting the locking members can be raised and lowered in the respective longitudinal frames 5. At the same time, the upper end of the lock member lifting shaft 8 of each caster 4 is fixed to the operation frame 7, and a pedal shaft 10 with a pedal 9 protruding between the front end portions of the left and right longitudinal frames 5, 5 is pivoted. Then, behind the pedal shaft 10, two cam shafts 11 and 12 on the front side and the rear side, which are integrally connected to each other with a predetermined interval, are horizontally mounted between the left and right longitudinal frames 5 and 5, respectively. A trochanter 13 attached to each end of each of the cam shafts 11 and 12 is interposed between the longitudinal frame 5 and the operation frame 7, and a slider crank mechanism 14 is interposed between the pedal shaft 10 and the front cam shaft 11. In the upward inclined posture of the pedal 9, each trochanter 13 is moved to the operating frame 7. The operating frame 7 is lifted by being positioned on the convex portion 16 of the cam 15 provided on the lower surface side, thereby pulling up the lock member lifting shaft 8 to unlock each caster 4 and depressing the pedal 9, thereby each trochanter 13. Is moved from the convex portion 16 of the cam 15 to the concave portion 17, the operating frame 7 is pulled down by the urging force of the coil spring 31 provided on the caster 4, and the lock member lifting shaft 8 is pulled down to lock each caster 4. It is a thing.

  As shown in FIGS. 5 and 6, the left and right longitudinal frames 5 of the base frame 3 are respectively outward outward from the upper ends of the frame main body 19 and the upper side walls 19 a and 19 a of the frame main body 19. The frame main body portion 19 includes side wall portions 19a and 19a and a bottom wall portion 19b. Further, the operating frame 7 for lifting the lock member is formed into a U-shaped frame having a downward cross section by both side wall portions 7a and 7a and the upper wall portion 7b so as to be able to be raised and lowered in the frame main body portion 19 of the longitudinal frame 5. Is formed.

  Next, the structure of the caster 4 and its locking mechanism will be described with reference to FIGS. The caster 4 is disposed in a yoke portion 21, a pair of left and right wheels 22 and 22 rotatably mounted on the yoke portion 21 by an axle 23, and a mounting hole 24 provided on the front side in the traveling direction of the yoke portion 21. The yoke portion 21 is attached to the flange shaft 25 so as to turn 360 ° around the flange shaft 25.

  When attaching the caster 4 to the front and rear end portions of the longitudinal frame 5, the flange shaft 25 has a required length upward from a bolt insertion hole (not shown) provided in the bottom wall portion 19 b of the frame main body portion 19. The bottom wall portion 19b is fastened with nuts 27 and 28 that are inserted through and screwed so as to sandwich the bottom wall portion 19b, thereby being fixed to the frame main body portion 19 of the longitudinal frame 5.

  A lower portion of the mounting hole 24 provided in the yoke portion 21 forms a guide hole 30 that guides the lock member 29 so as to be slidable up and down. As shown in FIGS. 5 and 6, the lock member 29 is inserted into the shaft 25 through the shaft insertion hole 29 o provided on the lock member 29 slidably in the axial direction, and is vertically moved into the guide hole 30 of the yoke portion 21. In a slidably fitted state, it is biased downward by a coil spring 31 interposed between the yoke portion 21 and the lock member 29, and the lock piece 29 a at the lower end portion is applied to the left and right wheels 22, 22. Each is engaged with an engaging groove 32 provided at a constant pitch, thereby preventing the rotation of both wheels 22 and 22.

  A lock member lifting shaft 8 passes through the shaft 25 made of a hollow bolt along the center axis thereof, and a lower end portion 8b thereof is an end attached to a lower end portion of the shaft insertion hole 29o of the lock member 29. The end plate 33 is held by a nut 34 that protrudes through the plate 33 and is screwed to the protruding end portion, and the upper end portion 8 a of the lock member lifting shaft 8 is located above the operation frame 7 disposed in the longitudinal frame 5. It penetrates the wall 7b, is bent sideways and is locked to the operating frame 7. 5A and 5B, the operating frame 7 is urged downward by the coil spring 31 and the lock piece 29a engages with the engagement groove 32 of the wheel 22 so that the wheel 22 When the rotation is prevented, the operating frame 7 is at the lower limit position in the longitudinal frame 5. From this state, the operating frame 7 is attached to the coil spring 31 as shown in FIGS. 6 (a) and 6 (b). By lifting the lock member lifting shaft 8 against the force and lifting the lock member lifting shaft 8 to a predetermined height, the lock piece 29a of the lock member 29 is detached from the engagement groove 32 of the wheel 22, and the wheel 22 becomes rotatable.

  In each caster 4, the lock member 29 is biased downward by the coil spring 31 as described above, and the lock piece 29 a at the lower end engages with the engagement groove 32 of the wheel 22, thereby preventing the rotation of the wheel 22. However, in a state where the lock member 29 is urged downward by the coil spring 31, the yoke portion 21 is also prevented from turning. 7 (a) is a partially enlarged view of FIG. 5 (b), and FIG. 7 (b) is a partially enlarged view of FIG. 6 (b), as can be seen from these drawings. For example, turning lock pieces 35, 35 project from the lower end of the shaft 25 at both ends in the diametrical direction, and each turning lock piece 35 is prevented from rotating the wheel 22 by the lock member 29 being biased downward. In this state, as shown by the solid lines in FIG. 7A and FIG. 7C, the lock member 29 is provided on the upper side of the inner peripheral surface of the lower end portion of the shaft insertion hole 29o at regular intervals in the circumferential direction. By engaging the recess 36, the rotation of the lock member 29 is prevented to prevent the yoke portion 21 from turning, and the lock member 29 is pulled up by the lock member lifting shaft 8 and the lock of the wheel 22 is released. In this state, each swivel lock piece 35 is inserted into the vertical axis as shown in the phantom lines in FIGS. 7 (b) and (c). Located in an annular groove 37 provided on the lower side of the hole 29o lower end inner peripheral surface, allowing rotation of locking member 29, so as to permit pivoting of the yoke 21.

As shown in FIGS. 2 to 4, both end portions of the pedal shaft 10 are rotatably mounted on brackets 38, 38 fixed to opposite side surfaces of the left and right longitudinal frames 5, 5, respectively. Is fixed so that a U-shaped pedal 9 is projected forward. The front camshaft 11 closer to the pedal 9 and the rear camshaft 12 farther from the pedal 9 are both end portions of the camshafts 11 and 12 by left and right slide rods 40 and 40 extending along the longitudinal frame 5. The slide rods 40 are integrally connected to each other, and are supported by the fitting recesses 38a and 39a of the front and rear brackets 38 and 39 fixed to the front and rear ends of the longitudinal frame 5 so as to be slidable in the front and rear direction.

  The slider crank mechanism 14 interposed between the pedal shaft 10 and the front camshaft 11 includes, as shown in FIGS. 2 and 4, a swing crank 41 having a base end portion fixed to the pedal shaft 10, A mounting piece 42 integrally projecting downward on the front camshaft 11; a linkage 43 pivotally connected to the tip of the swing crank 41 and the tip of the mounting piece 42 by pins 44 and 45; When the swinging crank 41 swings from the solid line illustrated position in FIG. 4 to the virtual line illustrated position, the attachment piece 42 moves horizontally from the solid line illustrated position in FIG. Accordingly, the cam shaft 11 integrated with the mounting piece 42 moves horizontally from the position shown in the solid line in the drawing to the position shown in the phantom line, so that the trochanter 13 located on the concave portion 17 side of the cam 15 becomes the convex portion 16 of the cam 15. I will change to the side. Since the front camshaft 11 and the rear camshaft 12 are integrally connected by the slide rod 40, the front trochanter 13 and the rear trochanter 13 are simultaneously moved forward and backward. By moving from the concave portions 17 and 17 of the cams 15 and 15 on both sides to the convex portions 16 and 16, the operating frame 7 is lifted from the solid line illustrated position in the figure to the virtual line illustrated position.

  Further, when the swinging crank 41 swings from the phantom line illustrated position in FIG. 4 to the solid line illustrated position, the attachment piece 42 is retracted from the phantom line illustrated position to the solid line illustrated position by the linkage 43, and the camshafts 11, 12 are moved. Is retracted from the position shown in the phantom line to the position shown in the solid line, whereby each trochanter 13 on the convex portion 16 side of each cam 15 moves to the concave portion 17 side. It descends from the illustrated position to the state shown by the solid line. The slider crank mechanism 14 swings the swing crank 41 by the rotation of the pedal shaft 10 by the depression / pick-up operation of the pedal 9.

  Next, the use of the carriage 1 having the above-described configuration will be described. The carriage 1 is configured such that each caster 4 is locked when the pedal 9 is in a horizontal position as shown in FIGS. Is in a stopped state and stopped at that position.

  Now, when the pedal 9 is kicked up from the horizontal posture shown by the solid line in FIG. 4 to the upward inclined posture as shown in the phantom line in FIG. 4, the pedal shaft 10 rotates by an angle corresponding to the kicking angle of the pedal 9. The rotation of the shaft 10 causes the cam shafts 11 and 12 to move horizontally from the position indicated by the solid line in FIG. 4 to the position indicated by the phantom line via the slider crank mechanism 14. Transfering to the convex portion 16 side of the cam 15, the operating frames 7, 7 in the left and right longitudinal frames 5, 5 are lifted from the solid line illustrated position in FIG. 4 to the phantom line illustrated position. Pull up the lifting shaft 8.

  Each of the casters 4 has the lock member 29 urged downward by the coil spring 31 so that the lock piece 29a engages with the engagement groove 32 of the wheel 22 to prevent the wheel 22 from rotating. In the locked state (see FIG. 5 and FIG. 7 (a)), the turning lock pieces 35 of 25 are engaged with the recesses 36 of the lock member 29 and the turning of the wheels 22 (yoke part 21) is prevented. Since the lock is released by raising the lock member lifting shaft 8 to a predetermined height, the operation frames 7 and 7 in the left and right longitudinal frames 5 and 5 are lifted as described above, and the lock member lifting shaft 8 of each caster 4 is lifted. By pulling up, each caster 4 is unlocked.

  Further, when the pedal 9 is depressed from the state in which the caster 4 is in the upward inclined posture as shown by the phantom line in FIG. 4 and each caster 4 is unlocked, the pedal shaft 10 rotates in the reverse direction, and the slider The camshafts 11 and 12 move horizontally from the phantom line illustrated position in FIG. 4 to the solid line illustrated position via the crank mechanism 14, whereby the trochanter 13 on the convex portion 16 side of the cam 15 moves to the concave portion 17 side. The operating frames 7 and 7 are lowered from the phantom line illustrated position in FIG. 4 to the solid line illustrated position, whereby the lock member lifting shaft 8 of each caster 4 is pulled down, and the lock member 29 is pushed down by the biasing force of the coil spring 31. The wheel 22 is locked and prevented from rotating and turning.

  As described above, in this cart 1, by depressing the pedal 9, all four casters 4, front, rear, left and right can be locked simultaneously, and the pedal 9 is kicked up. All the casters 4... Can be unlocked all at once by using the upward inclined posture. Further, the carriage 1 includes a base frame 3 equipped with casters 4 on the front, rear, left and right, a front pedal shaft 10 horizontally mounted between front end portions between the left and right longitudinal frames 5 and 5 of the base frame 3, Behind this, rear camshafts 11 and 12 that are horizontally mounted between the two longitudinal frames 5 and 5, and a slider crank mechanism 14 that is interposed between the front pedal shaft 10 and the front camshaft 11. And an operating frame 7 fitted and disposed in each longitudinal frame 5 so as to be freely raised and lowered, a cam 15 provided on the lower surface side of the operating frame 7, and attached to both ends of each of the cam shafts 11 and 12, Since the structure is simple and the number of parts is small, the production cost of the carriage 1 can be reduced, and the caster 4 can be easily locked and unlocked. it can.

  In order to mount and install a floor pedestal 2 for a hospital room as illustrated in FIG. 1 on the carriage 1, the floor pedestal 2 is placed on both left and right longitudinal frames 5, 5 forming a base frame 3. The floor head base 2 can be fixed by screwing a screw (not shown) into the bottom surface side of the floor head base 2 from a screw hole 26 provided in the support flange portion 20 of each longitudinal frame 5.

  Further, in this carriage 1, the left and right longitudinal frames 5 of the base frame 3 project outwardly and horizontally from a frame main body portion 19 having an upward U-shaped cross section and both side wall portions 19 a and 19 a of the frame main body portion 19. The operating frame 7 for lifting the lock member is formed in a U-shaped frame with a downward cross section so that it can be freely raised and lowered into the frame body 19 of the longitudinal frame 5. Therefore, the operation frame 7 of the long object can be lifted and lowered in the longitudinal frame 5 and can be held accurately, and when mounting a floor head stand for a hospital room, a small locker, etc. By placing the screws on the support flange portions 20 and 20 of the frames 5 and 5 and screwing the screws to the bottom surface side of the load from the screw holes 26 provided in the support flange portion 20, the load can be quickly made. Easy and stable mounting and fixing Kill.

DESCRIPTION OF SYMBOLS 1 Carriage 2 Mounted objects, such as a floor head stand for patient rooms 3 Base frame 4 Caster 5 Long frame 8 Locking member raising shaft 9 Pedal 10 Pedal shaft 11, 12 Cam shaft 13 Trochanter 14 Slider crank mechanism 15 Cam 16 Convex part 17 Concave part
31 Coil spring

Claims (2)

  It is a cart that has casters attached to the front, back, left, and right of the base frame that lock the wheels by urging the lock member downward with a spring and unlocking the lock member by pulling up the lock member lifting shaft against the spring. The casters are attached to the front and rear portions of the left and right longitudinal frames of the base frame, and the operation frames for lifting the lock members are held up and down freely in the respective longitudinal frames. A plurality of camshafts that are fixedly connected to each other with a predetermined interval between the pedal shafts and a pedal shaft projecting between the front end portions of the left and right longitudinal frames. Are placed between the left and right longitudinal frames, and a trochanter attached to each end of each camshaft is interposed between the longitudinal frame and the operating frame, and the slider clutch is placed between the pedal shaft and the front camshaft. In the upward inclined posture of the pedal, the operating frame is lifted by the trochanter being located on the convex portion of the cam provided on the lower surface side of the operating frame, thereby lifting the lock member lifting shaft and Is unlocked and the pedal is depressed to move each trochanter from the convex part of the cam to the concave part to lower the operating frame, and the lock member lifting shaft is lowered by the biasing force of the spring to lock each caster. A dolly like that.   Each of the left and right longitudinal frames of the base frame is composed of a frame body portion with an upward U-shaped cross section and support flange portions with screw holes projecting horizontally outward from both side wall portions of the frame body portion. 2. The carriage according to claim 1, wherein the working frame is formed into a U-shaped frame having a downward cross-section so as to be fitted in the frame main body portion of the longitudinal frame so as to be freely raised and lowered.

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