WO2016145701A1 - Multifunctional tool and rapid replacement structure thereof - Google Patents

Abstract

A multifunctional tool and a rapid replacement structure thereof, comprise an output shaft assembly. An elastic chuck (16) capable of moving axially is arranged in the output shaft assembly. A locking shaft (10) is arranged in the elastic chuck (16) and driven by an elastic assembly to move axially in the elastic chuck (16), thus expansion opening and closing of the elastic chuck (16) are achieved. The present invention controls the axial sliding of the output shaft assembly and the locking shaft assembly by rotating a knob at the head of the machine, thus the saw web is controlled to be loosened or clamped and the rapid replacement function is achieved.

Description

Multifunctional tool and its quick change structure Technical field

The invention belongs to the technical field of electric tools in the mechanical industry, and particularly relates to a multifunctional tool capable of performing various operations such as cutting and sanding, and a quick change structure thereof.

Background technique

Multi-tools can be used to hold woodworking saw blades, metal saw blades and triangular sanding discs. The woodworking saw blade or the metal saw blade can be cut on metal materials such as wood or aluminum alloy, and the sandpaper can be sanded and polished on the wood board, gypsum board or wall surface.

The saw blade and the triangular sand disc are mounted on the output shaft of the multi-tool. The output end surface of the output shaft has small bosses uniformly distributed on the circumference. The small bosses are used for positioning the saw blade and the triangular sand disc, and the output shaft is also With threaded holes, use a hex wrench to tighten the screws to secure the saw blade and the triangular sanding disc.

When replacing the saw blade and the triangular sanding disc, completely remove the screws, put on the triangular sanding disc or the saw blade, and then tighten the screws with a hex wrench. Therefore, the replacement of the triangular sand disc and the saw blade is not efficient, and the hex wrench is easy to lose, and cannot be replaced after being lost.

Summary of the invention

The technical problem to be solved by the present invention is that in order to solve the technical problem that the multi-tool replaces the saw blade in the prior art, the present invention provides a screw blade that can be quickly replaced and clamped without fixing the saw blade. Quick change structure and its tools.

The technical solution adopted by the present invention to solve the technical problem thereof is: a quick change structure of a multifunctional tool, comprising an output shaft assembly, wherein the output shaft assembly is provided with an axially movable elastic collet, and the elastic collet is provided A locking shaft is provided, and the locking shaft is driven to move axially in the elastic collet by the elastic component, thereby realizing the elastic collet opening and closing. The traditional replacement method is to completely remove the screws on the saw blade and the triangular sand disc, and then put on the triangular sand disc or the saw blade, and then tighten the screw with a hex wrench, not only the replacement efficiency is not high, but also the hex wrench is easy to be lost, and after being lost It cannot be replaced. The invention does not require a screw to fix the saw blade, and controls the loosening or clamping of the saw blade by rotating the knob of the machine head to control the axial sliding of the output shaft assembly and the locking shaft assembly, thereby realizing the quick change function.

Further, in order to facilitate the structural design of the present invention, the elastic collet and the elastic component can only be axially slid, and cannot be rotated axially, and the following improvements are made: the output shaft assembly includes a main structure The output shaft and the auxiliary output shaft, the upper half of the auxiliary output shaft is located in the lower end of the main output shaft, the outer diameter of the lower half is larger than the inner diameter of the main output shaft, the inner diameter of the main output shaft is uniform, and the inner wall of the main output shaft is also opened. There are symmetrical longitudinal straight grooves.

The specific structure of the elastic collet capable of clamping is as follows: the elastic collet has a unitary annular card and an elastic claw disposed under the circular card, and the annular card has the same inner diameter as the elastic claw, and both are locked The outer diameter d of the tight shaft is matched, and the outer ring of the circular card is symmetrically provided with a circular ring edge, and the annular convex edge can slide up and down in the longitudinal straight groove, and the bottom of the elastic claw has an elastic claw round step, and the elastic claw round step The outer diameter is slightly smaller than the inner diameter of the auxiliary output shaft and is located outside the auxiliary output shaft.

The elastic claw is composed of two circular arc bodies with a symmetrical shape, and the outer contour is columnar, and the outer diameter of the outer contour is slightly smaller than the inner diameter of the auxiliary output shaft, and the upper end surface of the two circular arc bodies is opposite to the lower end surface of the circular card. In one piece structure, the spacing between the two arc bodies forms two vertical grooves. The inner and outer diameters of the elastic claws are in a state in which they are not expanded, that is, in a contracted state.

The structure of the elastic component selection of the present invention is as follows:

The utility model comprises a fixed retaining ring disposed in the main output shaft, a elastic collet return spring, a locking shaft return spring and a circlip for the hole, wherein the fixed retaining ring is located above the circlip for the hole and is mounted on the locking shaft of The upper end, the ring card is located below the circlip for the hole, and the elastic collet return spring is set on the locking shaft, and the two ends are in plane contact with the upper end surface of the ring card and the lower end surface of the fixed ring, respectively. The locking shaft return spring is disposed in the shaft hole of the main output shaft, and the two ends are in plane contact with the lower end surface of the fixed retaining ring and the upper end surface of the circlip with the hole.

The elastic assembly further includes a pressing block disposed in the main output shaft, a cam and a knob disposed above the pressing block, the knob being fixed to the cam by a screw, and the pressing block is pressed on the fixed retaining ring by the knob and the cam. The cam has two spiral cones, and any one of the spiral cones is rotated by 180° to coincide with the other spiral cone. The bottom of the spiral cone has a concave arc-shaped card table, and the pressure block includes one body. a pressing block ring, two pressing block bosses and a pressing block protruding edge, wherein the pressing block bosses are symmetrically disposed on the upper end surface of the pressing block ring, and the upper end surface of the pressing block boss is arc-shaped and The arc card table is symmetrically disposed on the outer ring of the ring of the pressing block and is slidable in the longitudinal straight groove, and the lower end surface of the ring of the pressing block is pressed on the upper end surface of the ring.

In order to clamp and position the locking shaft, an elastic collet clamping assembly is also arranged on the output shaft assembly.

The clamping assembly is further improved by: at least two clamping holes are formed in the lower half of the auxiliary output shaft, the clamping holes are symmetrically disposed, and the axis of the clamping hole is perpendicular to the axis of the auxiliary output shaft, The elastic collet clamping assembly comprises a return spring, a reset sleeve and a fixing sleeve sleeved on the auxiliary output shaft for blocking the clamping hole, the reset sleeve being disposed in the clamping hole, and the return spring being disposed in the reset sleeve.

Preferably, the clamping holes are two, and the axis of the clamping holes is perpendicular to the plane A formed by the axial centerlines of the two vertical grooves.

In order to facilitate the replacement and fixing of the saw blade, the bottom of the locking shaft is arranged downwardly and has a conical surface and a locking shaft circular step. The outer diameter of the conical surface increases from top to bottom, and the outer diameter of the locking shaft circular step is slightly larger than The largest outer diameter of the conical surface.

The quick change structure of the multi-tool also includes a saw blade, and one end of the saw blade is provided with an inner diameter of the auxiliary output shaft A uniform mounting hole and a plurality of positioning holes are arranged in the circumferential direction of the mounting hole, and the lower end surface of the auxiliary output shaft has a plurality of bosses matched with the positioning holes.

Further, in order to facilitate the fixing of the circlip for the hole, the main output shaft is provided with a retaining ring groove, and the hole is fixed in the retaining ring groove by the circlip.

Further, the elastic collet return spring, the lock shaft return spring and the return spring are both compression springs.

Further, the fixed retaining ring is fixed to the locking shaft by a spring washer and a nut.

Further, for ease of installation, the output shaft assembly is also mounted with an upper bearing and a lower bearing.

Further, in order to position the fixing sleeve, the auxiliary output shaft is further provided with a wire retaining ring for positioning the fixing sleeve, and is attached to the lower end of the fixing sleeve.

A multi-function tool equipped with the quick-change structure described above, comprising a casing in which a power component and a mechanical transmission component are disposed, the mechanical transmission component including a quick-change structure and a shifting fork, the dialing The fork is placed on the main output shaft, and the fork is connected to the power component.

The utility model has the beneficial effects that the multifunctional tool of the invention and the quick-change structure thereof have the advantages of eliminating the locking screw and the hex wrench compared with the prior art, locking the saw blade with the elastic collet, and being compact and simple to operate. By turning the knob, the saw blade can be easily installed and disassembled, which significantly improves work efficiency.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing the three-dimensional structure of a saw blade in a quick-change structure of the multi-function tool of the present invention.

2 is a schematic perspective view showing the clamped state of the saw blade in the quick change structure of the multi-function tool of the present invention.

Fig. 3 is a structural schematic view showing the loose state of the multi-function tool of the present invention.

Fig. 4 is a structural schematic view showing the clamped state of the multi-function tool of the present invention.

Figure 5 is a cross-sectional view taken along line A-A of Figure 4;

Figure 6 is a cross-sectional view taken along line B-B of Figure 4;

Fig. 7 is a perspective view showing the three-dimensional structure of the output shaft and the circlip for the hole of the quick-change structure of the multi-function tool of the present invention.

Figure 8 is a schematic view of plane A.

In the figure: 1, auxiliary output shaft, 2, knob, 3, upper bearing, 4, clamp, 5, cam, 6, screw, 7, nut, 8, spring washer, 9, fixed retaining ring, 11, locking Axle reset bomb, 10, locking shaft, 12, shift fork, 13, elastic collet return spring, 14, main output shaft, 15, circlip with holes, 16, elastic collet, 18, lower bearing, 19, Fixing sleeve, 21, wire retaining ring for shaft, 22, saw blade, 23, conical surface, 24, boss, 25, return spring, 26, reset sleeve, 27, clamping hole, 29, longitudinal straight groove, 32, Annular flange, 35, mounting hole, 36, positioning hole, 37, elastic claw round step, 38, locking shaft round step, 39, retaining ring groove, 40, vertical groove, 41, briquetting ring, 42, Clamping boss, 43, brim flange, 45, elastic claw, 46, ring card, 50, casing, 51, spiral cone, 52, arc card.

detailed description

The invention will now be described in further detail with reference to the drawings. The drawings are simplified schematic diagrams, and only the basic structure of the present invention is illustrated in a schematic manner, and thus only the configurations related to the present invention are shown.

As shown in FIG. 1-8, in a preferred embodiment of the present invention, the quick-change structure output shaft assembly of the multi-function tool is provided with an axially movable elastic collet 16, and the elastic collet 16 is provided with a locking shaft 10 The locking shaft 10 is driven to move axially within the collet 16 by a resilient member to effect the opening and closing of the collet 16 .

The detailed structure is described as follows:

The output shaft assembly includes a main output shaft 14 and an auxiliary output shaft 1 of an integral structure. The upper half of the auxiliary output shaft 1 is located in the lower end of the main output shaft 14, and the outer diameter of the lower half is larger than the inner diameter of the main output shaft 14 (not exceeding the main The outer diameter of the output shaft 14 is larger than the outer diameter, and the upper and lower bearings and the fixed sleeve cannot be mounted on the main output shaft. The inner diameter of the main output shaft 14 is uniform, and the inner wall of the main output shaft 14 is also symmetric. The longitudinal straight groove 29, the output shaft assembly is also mounted with an upper bearing 3 and a lower bearing 18.

The elastic collet 16 has a unitary annular card 46 and an elastic claw 45 disposed under the annular card 46. The annular card 46 conforms to the inner diameter of the elastic claw 45 and is matched with the outer diameter d of the locking shaft 10. The outer ring of the ring card 46 is symmetrically disposed with a ring-shaped flange 32. The ring-shaped flange 32 can slide up and down in the longitudinal straight groove 29. The bottom of the elastic claw 45 has a resilient claw round step 37, and the elastic claw round step 37 The outer diameter is slightly smaller than the inner diameter of the auxiliary output shaft 1 (slightly smaller than the inner diameter of the auxiliary output shaft 1 for ease of mounting), and is located outside the auxiliary output shaft 1. The elastic claw 45 is composed of two circular arc bodies having a shape symmetrical, and the outer contour is columnar, and the outer diameter of the outer contour is slightly smaller than the inner diameter of the auxiliary output shaft 1, which is smaller than the elastic claw 45 to be opened or opened. The upper end surface of the two circular arc bodies is integrated with the lower end surface of the circular ring card 46, and the interval between the two circular arc bodies forms two vertical grooves 40.

The elastic assembly includes a fixed retaining ring 9 disposed in the main output shaft 14, a resilient collet return spring 13, a locking shaft return spring 11 and an annular circlip for the hole 15, and the main output shaft 14 is provided with a retaining ring in the inner ring The groove 39 is fixed in the retaining ring groove 39 by the circlip 15 and partially protruded outside the retaining ring groove 39. The fixed retaining ring 9 is fixed on the locking shaft 10 by the spring washer 8 and the nut 7, and the ring card 46 Located below the circlip 15 for the hole, the elastic collet return spring 13 is fitted on the locking shaft 10, and the two ends are in plane contact with the upper end surface of the annular card 46 and the lower end surface of the fixed retaining ring 9, respectively, and the locking shaft is reset. The spring 11 is fitted in the shaft hole of the main output shaft 14, and the two ends are in planar contact with the lower end surface of the fixed retaining ring 9 and the upper end surface of the hole circlip 15 respectively.

The elastic assembly further includes a pressing block 4 disposed in the main output shaft 14, and a cam 5 is disposed above the pressing block 4 Knob 2, the knob 2 is fixed to the cam 5 by screws 6, and the pressing block 4 is pressed against the fixed retaining ring 9 by the knob 2 and the cam 5.

The cam 5 has two spiral cone faces 51, and any one of the spiral taper faces 51 is rotated by 180° to coincide with the other spiral taper face 51. The bottom of the spiral taper face 51 has a concave arc-shaped card table 52, and the press block 4 includes The compact block ring 41, the two block bosses 42 and the block flanges 43 of the unitary structure are symmetrically disposed on the upper end surface of the block ring 41, on the block boss 42 The end surface has an arc shape and is matched with the circular arc table 52. The pressing block flange 43 is symmetrically disposed on the outer ring of the pressing ring 41 and can slide up and down in the longitudinal straight groove 29, and the lower end surface of the pressing ring 41 is pressed. On the upper end face of the retaining ring 9.

A resilient collet clamping assembly is also provided on the output shaft assembly. At least two clamping holes 27 are defined in the lower half of the auxiliary output shaft 1. The clamping holes 27 are symmetrically disposed. The axis of the clamping hole 27 is perpendicular to the axis of the auxiliary output shaft 1, and the elastic collet clamping assembly includes a reset. The spring 25, the reset sleeve 26 and the fixing sleeve 19 which is sleeved on the auxiliary output shaft 1 for blocking the clamping hole 27, and the auxiliary output shaft 1 is further provided with a wire retaining ring 21 for positioning the fixing sleeve 19, which is attached to The lower end of the sleeve 19 is fixed. The reset sleeve 26 is disposed within the clamping bore 27 and the return spring 25 is disposed in the reset sleeve 26. When the clamping holes 27 are two, the reset sleeve 26 is placed on both sides of the elastic claws 45 by the thrust of the return spring, and the elastic claws 45 are pressed to clamp the locking shaft 10, and may also be provided as a plurality of clamping holes. 27, symmetrically arranged as needed.

The bottom of the locking shaft 10 is arranged in a downwardly-oriented structure with a conical surface 23 and a locking shaft circular step 38. The outer diameter of the conical surface 23 is increased from top to bottom, and the outer diameter of the locking shaft circular step 38 is slightly larger than that of the conical surface 23. Maximum outer diameter.

The saw blade 22 further includes a mounting hole 35 and a plurality of positioning holes 36 corresponding to the inner diameter of the auxiliary output shaft 1 at one end of the saw blade 22, the positioning holes are evenly distributed outside the mounting hole 35, and the lower end surface of the auxiliary output shaft 1 has a plurality of A boss 24 that cooperates with the positioning hole 36.

The elastic collet return spring 13, the lock shaft return spring 11 and the return spring 25 are both compression springs.

A multi-function tool for mounting the quick-change structure of the present embodiment includes a casing 50 in which a power component and a mechanical transmission component are disposed, the mechanical transmission component including a quick-change structure and a shift fork 12, The shift fork 12 is fitted on the main output shaft 14, and the shift fork 12 is connected to the power component.

The situation of the functions implemented in this embodiment is as follows:

The knob 2 rotates counterclockwise to the bottom, and the cam 5 rotates simultaneously under the driving of the knob 2. The two symmetrical spiral cones 51 on the cam 5 push the two pressing block bosses 42 on the block 4 to push the pressure block 4 axis. To move, the pressing block 4 pushes the locking shaft assembly to move outward, and the elastic collet return spring 13 pushes the elastic collet 16 to move outward at the same time. The elastic claw 45 of the elastic collet 16 is under the action of the return spring 25 and the reset sleeve 26. Shrinking inward, the collet 16 is in a contracted state, and the saw blade can be removed or attached;

When the elastic collet 16 is in the contracted state, the positioning hole 36 of the saw blade 22 is fitted on the boss 24 of the lower end surface of the auxiliary output shaft 1, and the knob is rotated clockwise to the bottom, and two symmetrical spiral cone faces 51 on the cam 5 are provided. Separated from the two pressing block bosses 42, the locking shaft assembly is moved inwardly by the locking shaft return spring 11, and the elastic claws 45 are common to the elastic collet return spring 13 and the conical surface 23 of the locking shaft 10. When the elastic claw 45 is opened, the elastic collet 16 is moved inwardly under the pushing of the locking shaft circular step 38 of the locking shaft 10, and the elastic claw round step 37 on the elastic collet 16 is pressed. The edge of the circular hole 35 in the saw blade 22 locks the saw blade 22.

In view of the above-described embodiments of the present invention, various changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and the technical scope thereof must be determined according to the scope of the claims.

Claims (18)

A quick change structure of a multifunctional tool, comprising: an output shaft assembly, an axially movable elastic collet (16) disposed in the output shaft assembly, and a locking shaft disposed in the elastic collet (16) 10), the locking shaft (10) is driven to move axially in the elastic collet (16) by the elastic component, thereby achieving the opening and closing of the elastic collet (16). The quick-change structure of the multi-function tool according to claim 1, wherein said output shaft assembly comprises a main output shaft (14) and a sub-output shaft (1) of an integral structure, and an auxiliary output shaft (1) The upper half is located in the lower end of the main output shaft (14), the outer diameter of the lower half is larger than the inner diameter of the main output shaft (14), the inner diameter of the main output shaft (14) is uniform, and the inner wall of the main output shaft (14) is also A symmetrical longitudinal straight groove (29) is opened. A quick change structure for a multi-function tool according to claim 2, wherein said elastic collet (16) has a unitary annular card (46) and an elasticity disposed under the circular card (46) The claw (45), the circular card (46) and the elastic claw (45) have the same inner diameter, and are matched with the outer diameter d of the locking shaft (10), and the outer ring of the circular card (46) is symmetrically arranged with a circle The annular flange (32), the annular flange (32) can slide up and down in the longitudinal straight groove (29), the bottom of the elastic claw (45) has a resilient claw round step (37), and the elastic claw round step (37) The outer diameter is slightly smaller than the inner diameter of the auxiliary output shaft (1) and is located outside the auxiliary output shaft (1). The quick-change structure of the multi-function tool according to claim 3, characterized in that: the elastic claw (45) is composed of two circular arc bodies of symmetrical shape, the outer contour is columnar, and the outer diameter of the outer contour is slightly It is smaller than the inner diameter of the auxiliary output shaft (1), and the upper end faces of the two circular arc bodies are integrated with the lower end surface of the annular card (46), and the interval between the two circular arc bodies forms two vertical grooves (40). The quick change structure of the multi-function tool according to claim 3, wherein the elastic component comprises a fixed retaining ring (9) disposed in the main output shaft (14), a resilient collet return spring (13), and a locking Axle return spring (11) and circlip (15) for the hole, The fixed retaining ring (9) is located above the hole circlip (15) and is mounted on the upper end of the locking shaft (10), and the annular card (46) is located below the circlip (15) for the hole. The elastic collet return spring (13) is sleeved on the locking shaft (10), and the two ends are in planar contact with the upper end surface of the annular card (46) and the lower end surface of the fixed retaining ring (9), respectively. The locking shaft return spring (11) is set in the shaft hole of the main output shaft (14), and the two ends are in plane contact with the lower end surface of the fixed retaining ring (9) and the upper end surface of the circlip with the circlip (15). The quick change structure of the multi-function tool according to claim 4, wherein the elastic assembly further comprises a pressing block (4) disposed in the main output shaft (14), and a cam disposed above the pressing block (4) (5) and knob (2), the knob (2) is fixed on the cam (5) by screws (6), and the pressure block (4) is pressed against the fixed ring by the knob (2) and the cam (5) (9) Upper. The quick change structure of the multifunctional tool according to claim 6, wherein said cam (5) has two spiral tapered surfaces (51), and any one of the spiral tapered surfaces (51) is rotated by 180°. The other spiral conical surface (51) is coincident, and the bottom of the spiral conical surface (51) has a concave arc-shaped card table (52), and the pressing block (4) comprises an integral structure of the briquetting ring (41), Two pressing block bosses (42) and a pressing block flange (43), the pressing block bosses (42) are symmetrically disposed on the upper end surface of the pressing block ring (41), and the pressing block bosses (42) The upper end surface has an arc shape and is matched with the circular arc table (52). The pressing block flange (43) is symmetrically disposed on the outer ring of the pressing ring (41) and can slide up and down in the longitudinal straight groove (29). The lower end surface of the pressing ring (41) is pressed against the upper end surface of the retaining ring (9). The quick change structure of the multi-function tool according to claim 2, wherein the output shaft assembly is further provided with an elastic collet clamping assembly. The quick-change structure of the multi-function tool according to claim 8, characterized in that: at least two clamping holes (27) are opened in the lower half of the auxiliary output shaft (1), the clamping The holes (27) are symmetrically arranged, the axis of the clamping holes (27) being perpendicular to the axis of the auxiliary output shaft (1), the elastic collet clip The clamping assembly comprises a return spring (25), a reset sleeve (26) and a fixing sleeve (19) fitted on the auxiliary output shaft (1) for blocking the clamping hole (27), the reset sleeve (26) being arranged Within the clamping bore (27), a return spring (25) is disposed in the reset sleeve (26). The quick-change structure of the multi-function tool according to claim 9, characterized in that: the clamping holes (27) are two, the axis of the clamping hole (27) and the axial direction of the two vertical grooves (40) The plane A formed by the center line is perpendicular. The quick-change structure of the multi-function tool according to claim 1, characterized in that: the bottom of the locking shaft (10) is arranged downwardly and has a conical surface (23) and a locking shaft circular step (38). The outer diameter of the conical surface (23) is increased from top to bottom, and the outer diameter of the locking shaft circular step (38) is slightly larger than the maximum outer diameter of the conical surface (23). The quick change structure of the multi-function tool according to claim 2, further comprising a saw blade (22), wherein one end of the saw blade (22) is provided with a mounting hole corresponding to the inner diameter of the auxiliary output shaft (1) ( 35) and a plurality of positioning holes (36), the positioning holes are circumferentially distributed outside the mounting hole (35), and the lower end surface of the auxiliary output shaft (1) has a plurality of bosses matched with the positioning holes (36) (twenty four). The quick-change structure of the multi-function tool according to claim 4, characterized in that: the main output shaft (14) is provided with a retaining ring groove (39), and the hole is fixed by a circlip (15) In the retaining ring groove (39). The quick change structure of the multi-function tool according to claim 9, wherein the elastic collet return spring (13), the lock shaft return spring (11) and the return spring (25) are compression springs. The quick change structure of the multi-function tool according to claim 5, characterized in that the fixed retaining ring (9) is fixed to the locking shaft (10) by a spring washer (8) and a nut (7). A quick change structure for a multi-function tool according to claim 1, wherein said output shaft assembly is further provided with an upper bearing (3) and a lower bearing (18). The quick-change structure of the multi-function tool according to claim 9, characterized in that: the auxiliary output shaft (1) is further provided with a wire retaining ring (21) for positioning the fixing sleeve (19), which is located at The lower end of the fixing sleeve (19). A multi-function tool mounted with the quick-change structure according to any one of claims 1-17, characterized in that it comprises a casing (50), and a power component and a mechanical transmission component are arranged in the casing (50). The mechanical transmission component includes a quick change structure and a shift fork (12), the shift fork (12) is fitted on the main output shaft (14), and the shift fork (12) is connected to the power component.

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