Quick-change structure and clamping device for a handheld tool

Abstract

Quick-change structure and clamping device for a handheld tool, comprising a head shell, a wrench, an elastic O-ring, a fixed bracket, a locking sleeve, a first bearing, an output shaft, a second bearing, a fork and a spacer sleeve, a locking nut, a limit seat and a locking pull rod. The fixed bracket is detachably arranged above the head shell. The locking sleeve is rotatable and vertically movable within the fixed bracket. The wrench is rotatably arranged at the upper end of the locking sleeve. The output shaft is rotatably arranged on the first bearing and the second bearing. The fork is fixedly arranged on the output shaft, and a first spring, a locking nut and a limit seat are arranged inside the output shaft, and the limit seat is located below the locking nut. The wrench drives the locking sleeve, enabling the locking pull rod to selectively cooperate with and disengage from the locking nut. The present invention can easily and quickly replace the tool without additional tools, can firmly clamp the blade or accessory to prevent loosening, and has a simple and reliable structure and strong operating comfort.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical equipment, and particularly relates to a quick-change structure and a clamping device for a handheld tool. Background Art

[0002] Common handheld tools in the market, such as multi-functional saws, oscillating shovels, multi-purpose tools, etc., work on the principle that the output shaft makes a certain amplitude of left and right swinging motion around its own axis. Users need to replace and install different accessories or working heads on the output shaft, such as straight saw blades, circular saw blades, triangular abrasive discs, shoveled scrapers, etc., to achieve various different operation functions such as sawing, cutting, grinding, scraping, etc., to meet different working use requirements.

[0003] However, current multi-functional saws and the like still adopt the original installation method, that is, loosening or tightening the fastening bolts with a wrench to achieve the installation and replacement of accessories or working heads, and the operation is very cumbersome and time-consuming.

[0004] In response to this, industry technicians have also made some improvements, and solved the problem of quick replacement of accessories by means of pressing with a strong spring and clamping with an elastic chuck. However, there are many problems, such as uncomfortable operation, complex structure and process, high cost, etc. The existing installation and replacement method of loosening or tightening accessories with a wrench is not comfortable enough to operate, the steps are relatively cumbersome, the efficiency is low, and it is time-consuming and laborious. The existing improved quick-change clamping device has a complex structure and process, and the clamping is unreliable, resulting in low product use efficiency. The most serious problem is that the clamping of the accessory saw blade is unreliable, the product vibrates and makes a lot of noise, the accessory is loose, and even the saw blade breaks and poses a danger. Summary of the Invention

[0005] Aiming at the problems existing in the above-mentioned prior art, the present invention aims to provide a quick-change structure and a clamping device for a handheld tool with a simple, stable, reliable, component-saving and high working efficiency structure.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A quick-change structure and a clamping device for a handheld tool, comprising a head shell, a wrench, a fixed bracket, a locking sleeve, a bearing I, an output shaft, a bearing II, a fork, an isolation sleeve, a locking nut, a locking pull rod, a limit seat, a spring I and a spring II.

[0008] The fixed bracket is detachably arranged above the head shell.

[0009] The locking sleeve is rotatably and vertically movable in the fixed bracket. The wrench is rotatably arranged at the upper end of the locking sleeve. The bearing 1 and the bearing 2 are concentrically fixed in the head shell.

[0010] The output shaft is rotatably arranged on the first bearing and the second bearing. The fork is rotatably arranged on the output shaft. An isolating sleeve is arranged on the output shaft, and the isolating sleeve is located below the fork. The fork and the isolating sleeve are located between the first bearing and the second bearing.

[0011] A locking pull rod is detachably arranged in the output shaft. A saw blade is detachably arranged between the output shaft and the locking pull rod.

[0012] Furthermore, a first retaining ring and a second retaining ring are respectively arranged on the outer sides of the first bearing and the second bearing. A rotating seat is arranged at one end of the head shell. An upper clamping groove, a first retaining ring clamping groove, a first bearing groove, a second bearing groove, a first retaining ring clamping groove, and a lower clamping groove are concentrically arranged in the rotating seat from top to bottom in sequence. The first bearing is arranged in the first bearing groove, the second bearing is arranged in the second bearing groove, the first retaining ring is arranged in the first retaining ring clamping groove, and the second retaining ring is arranged in the second retaining ring clamping groove.

[0013] Furthermore, a positioning seat is arranged on the fixed bracket. A round hole is arranged at the top of the positioning seat. The positioning seat is detachably arranged in the upper clamping groove. Two mounting holes are arranged on the fixed bracket. A sliding seat is arranged at one end of the locking sleeve. The sliding seat can slide up and down and is rotatably arranged in the positioning seat of the fixed bracket. The upper end of the sliding seat extends out of the round hole of the fixed bracket. A slot is arranged in the sliding seat. A spring positioning seat is arranged on the sliding seat, and a first spring is arranged on the spring positioning seat.

[0014] Furthermore, a platform is arranged at the upper end of the locking sleeve. A round hole is arranged on the platform. Two top plates are arranged in parallel at one end of the wrench. A pin hole is arranged on the top plate. A cylindrical pin is arranged in the round hole on the locking sleeve and the pin hole on the wrench. The round hole on the locking sleeve and the pin hole on the wrench are connected together through the cylindrical pin.

[0015] Furthermore, the two opposite end faces of the top plate are respectively a first pressing surface and a second pressing surface. The distance from the first pressing surface to the center of the pin hole is larger than the distance from the second pressing surface to the center of the pin hole.

[0016] Furthermore, a guide post is arranged at the upper end of the output shaft. A first bearing clamping platform is arranged at the upper end of the guide post. The first bearing clamping platform is arranged in the first bearing. The rear end of the guide post is arranged in the second bearing.

[0017] Furthermore, a locking pull rod jack is arranged in the output shaft. A locking nut cavity is arranged at the rear end of the locking pull rod jack. A limit seat clamping groove is arranged at the rear end of the locking nut cavity. A limit seat is arranged in the limit seat clamping groove.

[0018] Further, a pull rod head is provided at the lower end of the locking pull rod, and a screw rod is provided above the pull rod head; a plug rod is provided at the upper end of the locking pull rod, and the shape of the plug rod matches that of the slot. The plug rod at the upper end of the locking pull rod is detachably arranged in the slot of the locking sleeve.

[0019] Further, a plurality of positioning holes are provided on the saw blade, and a plurality of clamping columns are provided at the lower end of the output shaft. The size and shape of the clamping columns are consistent with the corresponding positioning holes on the saw blade, and the clamping columns can be clamped in the corresponding positioning holes on the saw blade.

[0020] Further, a positioning column is provided on one side of the wrench, the positioning column and the pressing surface are on the same side of the wrench, a rubber ring clamping groove is provided on the positioning column, and an elastic O-ring is provided in the rubber ring clamping groove. The positioning column is rotatably clamped in the limiting hole on the fixed bracket.

[0021] Further, a dust-proof ring is provided on the output shaft, and the dust-proof ring is arranged in the lower clamping groove of the head shell.

[0022] Further, a snap ring is provided on the shift fork, and the shift fork is fixedly arranged on the output shaft through the snap ring.

[0023] Further, a fixed bracket mounting platform is provided at the upper end of the head shell, and the fixed bracket is arranged on the fixed bracket mounting platform. A shift fork action cavity is arranged in the head shell.

[0024] Further, the slot is a groove in the shape of a plum blossom, square, pentagon, triangle or other shapes.

[0025] Further, a positioning groove is provided at the top of the fixed bracket, and a limiting hole is provided on the positioning groove.

[0026] Further, the saw blade can be a straight saw blade, circular saw blade, triangular abrasive disc, shovel-shaped scraper, etc.

[0027] Further, the limiting seat can be arranged in the output shaft positioning hole by means of tight fitting, welding or threaded fitting.

[0028] Further, a locking nut is provided above the limiting seat, the shape of the locking nut matches the shape of the output shaft groove, and the two are in clearance fit. A second spring is arranged between the locking nut and the output shaft.

[0029] Further, the isolation sleeve is made of metal or plastic materials.

[0030] The beneficial effects of the present invention are as follows: The tool can be easily and quickly replaced without the need for additional tools. The blade or accessory can be firmly clamped to prevent loosening and avoid danger. Moreover, it can meet the comfort requirements of the user during operation, improve work efficiency, save components, and simplify the structure, making it more stable and reliable. The structure is simple and reliable, and the operation comfort is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic structural diagram of the present invention when the locking rod and the locking sleeve are disengaged;

[0032] Figure 2 Schematic structural diagram of the overall structure of the present invention;

[0033] Figure 3 Schematic structural diagram of the present invention when the locking rod and the locking sleeve are locked and engaged;

[0034] Figure 4 Schematic structural diagram when the locking nut is pushed up during the installation of the saw blade;

[0035] Figure 5 Schematic assembly diagram of the various components of the present invention;

[0036] Figure 6 Schematic structural diagram of the fixed bracket;

[0037] Figure 7 Schematic structural diagram of the locking sleeve;

[0038] Figure 8 Schematic structural diagram of the bottom slot of the locking sleeve;

[0039] Figure 9 Schematic structural diagram of the wrench;

[0040] Figure 10 Schematic structural diagram of the fork;

[0041] Figure 11 Schematic structural diagram of the output shaft;

[0042] Figure 12 For Figure 11 Cross-sectional view taken along line B-B in

[0043] Figure 13 Schematic structural diagram of the locking rod;

[0044] Figure 14 Schematic structural diagram of the bottom plug of the locking rod;

[0045] Figure 15 Schematic structural diagram of the dust ring;

[0046] Figure 16 Schematic structural diagram of the spacer sleeve;

[0047] Figure 17 It is a schematic structural diagram of the limit seat;

[0048] Figure 18 It is a schematic structural diagram of the head shell;

[0049] Figure 19 It is Figure 18 The A-A sectional view in

[0050] Reference numerals in the drawings: 1 - head shell, 2 - wrench, 3 - fixed bracket, 4 - locking sleeve, 5 - bearing I, 6 - output shaft, 7 - bearing II, 8 - fork, 9 - retaining ring I, 10 - retaining ring II, 11 - locking nut, 12 - limit seat, 13 - locking pull rod, 14 - saw blade, 15 - spacer sleeve, 16 - elastic O-ring, 17 - dust ring, 18 - cylindrical pin, 19 - spring I, 20 - spring II, 21 - rotating seat, 22 - upper card slot, 23 - retaining ring card slot I, 24 - bearing slot I, 25 - bearing slot II, 26 - retaining ring card slot II, 27 - lower card slot, 28 - top plate, 29 - first pressing surface, 30 - pin hole, 31 - positioning post, 32 - rubber ring card slot, 33 - second pressing surface, 34 - snap ring, 35 - clamping post, 36 - bearing clamping platform I, 37 - guide post, 38 - locking nut cavity, 39 - limit seat card slot, 40 - locking pull rod insertion hole, 41 - sliding seat, 42 - platform, 43 - spring positioning seat, 44 - round hole, 45 - slot, 46 - pull rod head, 47 - screw rod, 48 - inserting rod, 49 - fixed bracket mounting platform, 50 - fork action cavity, 51 - positioning seat, 52 - round hole, 53 - positioning groove, 54 - limit hole, 55 - mounting hole, 56 - screw. Detailed implementation manners

[0051] For the convenience of understanding, the technical solution of the present invention will be further specifically described below with reference to the drawings and through embodiments:

[0052] As Figures 1 - 19 shown, a quick-change structure and a clamping device of a handheld tool include a head shell 1, a wrench 2, a fixed bracket 3, a locking sleeve 4, a bearing I 5, an output shaft 6, a bearing 27, a fork 8, an elastic O-ring 16, a locking nut 11, a limit seat 12, a spring I 19, a spring II 20, a locking pull rod 13 and a spacer sleeve 15.

[0053] The fixed bracket 3 is detachably arranged above the head shell 1.

[0054] The bearing I 5 and the bearing II 7 are concentrically fixed in the head shell 1.

[0055] The outer sides of the bearing I 5 and the bearing II 7 are respectively provided with a retaining ring I 9 and a retaining ring II 10.

[0056] The output shaft 6 is rotatably arranged on the bearing I 5 and the bearing II 7.

[0057] The output shaft 6 is provided with a fork 8 and an isolating sleeve 15. The fork 8 is rotatable. The isolating sleeve 15 is located below the fork 8. The fork 8 and the isolating sleeve 15 are located between the first bearing 5 and the second bearing 7. The material of the isolating sleeve 15 is a metal or plastic material.

[0058] The locking pull rod 13 is detachably arranged inside the output shaft 6.

[0059] The locking sleeve 4 is rotatable and vertically movable and is arranged inside the fixed bracket 3.

[0060] The wrench 2 is rotatably arranged at the upper end of the locking sleeve 4.

[0061] A saw blade 14 is detachably arranged between the output shaft 6 and the locking pull rod 13. A number of positioning holes are provided on the saw blade 14.

[0062] The upper end of the head shell 1 is provided with a fixed bracket mounting platform 49. A fork operating cavity 50 is arranged inside the head shell 1.

[0063] A swivel base 21 is arranged at one end of the head shell 1. An upper clamping groove 22, a first snap ring clamping groove 23, a first bearing groove 24, a second bearing groove 25, a second snap ring clamping groove 26 and a lower clamping groove 27 are concentrically arranged inside the swivel base 21 from top to bottom.

[0064] The fixed bracket 3 is provided with a positioning seat 51 and two mounting holes 55. A round hole 52 is provided at the top of the positioning seat 51; the positioning seat 51 is detachably arranged inside the upper clamping groove 22.

[0065] The fixed bracket 3 is fixed to the head shell 1 by screws 56.

[0066] The top of the fixed bracket 3 is provided with a positioning groove 53, and a limiting hole 54 is provided on the positioning groove 53.

[0067] One end of the locking sleeve 4 is provided with a sliding seat 41. The sliding seat 41 is vertically slidable and rotatable and is arranged inside the positioning seat 51 of the fixed bracket 3. The upper end of the sliding seat 41 extends out from the round hole 52 of the fixed bracket 3.

[0068] The sliding seat 41 is provided with a spring positioning seat 43, and a first spring 19 is arranged on the spring positioning seat 43.

[0069] The upper end of the locking sleeve 4 is provided with a platform 42, and a round hole 44 is provided on the platform 42.

[0070] A slot 45 is arranged inside the sliding seat 41. The slot 45 is a spline groove, and the number of grooves can be several. The slot 45 can also be designed as a polygon groove such as pentagon, hexagon, heptagon, octagon,... etc.

[0071] The wrench 2 can rotate 180° around the cylindrical pin 18

[0072] At one end of the wrench 2, two top plates 28 are arranged in parallel. A pin hole 30 is arranged on the top plate 28. The two opposite end faces of the top plate 28 are respectively a first pressing surface 29 and a second pressing surface 33. The distance from the first pressing surface 29 to the center of the pin hole 30 is larger than the distance from the second pressing surface 33 to the center of the pin hole 30.

[0073] A positioning post 31 is arranged on one side of the wrench 2. The positioning post 31 and the first pressing surface 29 are located on the same side of the wrench 2. A rubber ring clamping groove 32 is arranged on the positioning post 31, and an elastic O-ring 16 is arranged in the rubber ring clamping groove 32. The positioning post 31 is rotatably clamped in the limiting hole 54 on the fixed bracket 3.

[0074] The locking sleeve 4 can be selectively engaged or disengaged with the locking pull rod 13. Rotating the wrench 2 drives the locking sleeve 4 to loosen or lock the locking pull rod 13 and the locking nut 11.

[0075] The round hole 44 on the locking sleeve 4 and the pin hole 30 on the wrench 2 are connected together by a cylindrical pin 18.

[0076] The first bearing 5 is arranged in the first bearing groove 24 on the head shell 1, and the second bearing 7 is arranged in the second bearing groove 25 on the head shell 1.

[0077] The first retaining ring 9 is arranged in the first retaining ring groove 23 on the head shell 1; the second retaining ring 10 is arranged in the second retaining ring groove 26 on the head shell 1.

[0078] A dust-proof ring 17 is arranged on the output shaft 6, and the dust-proof ring 17 is arranged in the lower clamping groove 27 of the head shell 1.

[0079] A guide post 37 is arranged at the upper end of the output shaft 6. A first bearing clamping platform 36 is arranged at the upper end of the guide post 37, and the first bearing clamping platform 36 is arranged in the first bearing 5. The rear end of the guide post 37 is arranged in the second bearing 7.

[0080] A plurality of clamping posts 35 are arranged at the lower end of the output shaft 6. The size and shape of the clamping posts 35 are consistent with the size and position of the corresponding clamping holes on the saw blade 14, and the clamping posts 35 can be clamped in the corresponding clamping holes on the saw blade 14.

[0081] A locking pull rod jack 40 is arranged in the output shaft 6. A locking nut cavity 38 is arranged at the rear end of the locking pull rod jack 40, and a limiting seat clamping groove 39 is arranged at the rear end of the locking nut cavity 38. A limiting seat 12 is arranged in the limiting seat clamping groove 39.

[0082] The limiting seat 12 can be arranged in the dust-proof ring clamping groove 39 by means of tight fitting, welding or thread fitting.

[0083] The locking nut 11 can move up and down inside the output shaft 6 under the action of the first spring 19.

[0084] A locking nut 11 is provided at the rear end of the locking nut cavity 38. A second spring 20 is provided between the locking nut 11 and the output shaft 6.

[0085] A snap ring 34 is provided on the fork 8, and the fork 8 is fixedly arranged on the output shaft 6 through the snap ring 34.

[0086] A pull rod head 46 is provided at the lower end of the locking pull rod 13, and a screw rod 47 is provided above the pull rod head 46; a plug rod 48 is provided at the upper end of the locking pull rod 13, and the shape of the plug rod 48 is matched with the slot 45. The plug rod 48 at the upper end of the locking pull rod 13 is detachably arranged in the slot 45.

[0087] When the cutting, grinding or sawing is in normal working state, the positioning post 31 on the wrench 2 is engaged in the limit hole 54 on the fixed bracket 3, and the wrench 2 pulls up the locking sleeve 4 and keeps it in the pulled-up and elevated position. The locking nut cavity 38 and the second spring 20 firmly clamp the locking pull rod 13 to prevent the blade or accessory from loosening. When the blade or accessory needs to be replaced, pull the wrench 2 by hand to disengage the positioning post 31 from the limit hole 54, turn the wrench 2 by 180 degrees, the wrench 2 drives the locking sleeve 4 to move downward, and the slot 45 at the lower end of the locking sleeve 4 is inserted onto the plug rod 48 at the upper end of the locking pull rod 13 to lock the locking sleeve 4 and the locking pull rod 13 to each other. Rotate the wrench 2, the wrench 2 drives the locking pull rod 13 to rotate through the locking sleeve 4, so that the screw rod 47 at the lower end of the locking pull rod 13 gradually disengages from the locking nut 11 in the output shaft 6, then remove the locking pull rod 13 and remove the saw blade 14 for replacement. When installing the saw blade 14, insert the locking pull rod 13 into the output shaft 6, screw the screw rod 47 on the locking pull rod 13 into the locking nut 11 by one or two threads, the locking pull rod 13 pushes up the locking nut 11, and then rotate the wrench 2 in the reverse direction to screw the screw rod 47 of the locking pull rod 13 into the locking nut 11 to firmly lock the locking nut 11 and the locking pull rod 13. The clamping post 35 at the lower end of the output shaft 6 is tightly and firmly buckled in the clamping hole of the blade or accessory to prevent loosening. Then turn the wrench 2 by 180 degrees again and engage the positioning post 31 on the wrench 2 into the limit hole 54 to perform cutting, grinding or sawing work.

Claims

1. Quick-change structure and clamping device of a handheld tool, comprising a head shell, a wrench, an elastic O-ring, a fixed bracket, a locking sleeve, a first bearing, an output shaft, a second bearing, a fork and a spacer sleeve, a locking nut, a locking pull rod, a first limit seat spring and a second spring It is characterized in that: The wrench is connected to the locking sleeve by a cylindrical pin and is detachably arranged on the fixed bracket. A second spring is arranged above the locking sleeve, and the fixed bracket is fixed to the head shell with screws; A first spring, a locking nut and a limit seat are arranged inside the output shaft, and the limit seat is fixed on the output shaft; A saw blade is detachably arranged between the output shaft and the locking pull rod; One end of the locking sleeve is provided with a sliding seat. The sliding seat can slide up and down and rotate in the positioning seat of the fixed bracket. A slot is arranged inside the sliding seat. A spring positioning seat is arranged on the sliding seat, and a first spring is arranged on the spring positioning seat. A platform is arranged at the upper end of the locking sleeve, and a round hole is arranged on the platform; Two top plates are arranged in parallel at one end of the wrench. Pin holes are arranged on the top plates. A cylindrical pin is arranged in the round hole on the locking sleeve and the pin holes on the wrench; The two opposite end faces of the top plate are respectively a first pressing surface and a second pressing surface. The distance from the first pressing surface to the center of the pin hole is greater than the distance from the second pressing surface to the center of the pin hole; The upper end of the locking pull rod is provided with a spline boss or a polygonal boss. The number of polygon sides or the number of bosses is the same as the number of slots in the locking sleeve. The boss of the locking pull rod and the groove of the locking sleeve are in clearance fit; A screw rod is arranged at the lower end of the locking pull rod, and the screw rod is matched with the locking nut.

2. The quick-change structure and clamping device of the handheld tool according to claim 1, characterized in that: The head shell is provided with a rotating seat. An upper clamping groove, a first snap ring groove, a first bearing groove, a second bearing groove, a second snap ring groove and a lower clamping groove are concentrically arranged in the rotating seat from top to bottom. A first bearing is arranged in the first bearing groove, a second bearing is arranged in the second bearing groove, a first snap ring is arranged in the first snap ring groove, a second snap ring is arranged in the second snap ring groove, and a dust ring is arranged below the head shell.

3. The quick-change structure and clamping device of the handheld tool according to claim 1, characterized in that: The fixed bracket is provided with a positioning seat. A round hole is arranged at the top of the positioning seat, and the positioning seat is detachably arranged in the upper clamping groove of the head shell.

4. The quick-change structure and clamping device of the handheld tool according to claim 3, characterized in that: The slot in the locking sleeve is a spline groove, and the number of the grooves is several polygonal grooves.

5. The quick-change structure and clamping device of the hand-held tool according to claim 4, characterized in that: A positioning post is arranged on one side of the wrench. The positioning post and the first pressing surface are on the same side of the wrench. A rubber ring groove is arranged on the positioning post, and an elastic O-ring is arranged in the rubber ring groove. The positioning post can be clamped in the limit hole on the fixed bracket.

6. The quick-change structure and clamping device of the handheld tool according to claim 1, characterized in that: The output shaft penetrates along the axis. The output shaft is provided with a polygonal groove or a spline groove; A second spring, a locking nut and a limit seat are arranged inside the output shaft; A limit seat is arranged below the locking nut.

7. The quick-change structure and clamping device of the hand-held tool according to claim 6, characterized in that: The connection between the limit seat and the output shaft is an interference fit; The limit seat and the output shaft are connected by threading, welding or riveting.

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