WO2012006948A1

WO2012006948A1 - Power tool

Info

Publication number: WO2012006948A1
Application number: PCT/CN2011/077089
Authority: WO
Inventors: 李成道; 霍立祥; 吴海全; 李辉
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2010-07-12
Filing date: 2011-07-12
Publication date: 2012-01-19
Also published as: CN102328304A; CN102328304B

Abstract

A power tool comprising: a head shell (2), an output shaft (3) extending from within the head shell and used for driving a working head (6), and fastening elements (50, 51, 52, 53, 54, 55) mounted on the output shaft and used for securing the working head. The fastening element is provided with rods (502, 512, 522, 532, 542, 552) extending into the output shaft. The power tool further comprises a quick change clamping device, and the quick change clamping device comprises a locking element (320) disposed in the output shaft and an actuating assembly able to make the locking element move with respect to the fastening element. The locking element is provided with a hole (323) through which the rod of the fastening element passes. The hole on the locking element is selectively mated with the rod of the fastening element so that the locking element can selectively clamp or release the fastening element, thus the working head can be fastened onto the output shaft in a simple and reliable way. Such a power tool has a simple structure, is easy to use, and provides a strong clamping force.

Description

Power tools

The invention relates to a power tool, in particular a hand-held power tool.

Background technique

The multi-function machine is a common hand-held power tool in the industry. It works by swinging the output shaft around its own axis. Therefore, when the user installs different working heads on the free end of the output shaft, such as a straight saw blade, a circular saw blade, a triangular sanding disc, and a shovel-type scraper, a variety of different operating functions can be realized, such as sawing and cutting. , grinding, scraping, etc., to adapt to different work needs.

At present, the more common multi-function machine on the market generally includes a motor. The motor shaft of the motor is connected with an eccentric pin, and a bearing is sleeved on the eccentric pin to form an eccentric wheel structure. When the motor shaft rotates, the eccentric structure can perform an eccentric rotational motion about the axis of the motor shaft. The output shaft of the multi-function machine is disposed perpendicular to the motor shaft, and a fixed fork assembly is connected to the output shaft, and the fork assembly is formed with two opposite extending arms, which surround the eccentric structure, and the two extending arms The inner side is in close contact with the bearing in the eccentric wheel structure, so that when the eccentric wheel is eccentrically rotated, the eccentric wheel structure drives the shifting fork to generate a horizontal oscillating motion, and the output shaft is fixed by the fixed connection of the shift fork and the output shaft. Swing around its axis. After installing different working heads on the free end of the output shaft, the multi-function machine can realize a variety of operating functions under high-speed oscillating motion.

However, the current multi-function machine still uses the more primitive work head installation method, that is, the fastening bolt is loosened by a wrench, and then the fastening component is removed from the output shaft; likewise, in the installation and replacement of the accessory In the same way, you need to use a wrench to loosen the fastening bolts before you can replace the work head and tighten the installation. It is cumbersome and time-consuming to operate.

Therefore, it is necessary to provide an improved power tool to solve the above problems.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power tool that can quickly and easily mount a work head on an output shaft of the power tool.

To achieve the above object, the present invention provides a power tool including a head case, an output shaft extending from the head case and used to drive the work head, and mounted on the output shaft and used to fix the work A fastening element of the head, the fastening element being provided with a stem extending into the output shaft. The power tool also includes a quick change clamp that includes a lock disposed within the output shaft and an actuating assembly that moves the lock relative to the fastening member. Wherein, the locking member is provided with a hole, and the rod portion of the fastening element passes through the hole of the locking member. Actuating assembly drive Said fastener is rotated about a line perpendicular to a longitudinal axis of said output shaft, said bore of said lock being selectively engageable with a stem of said fastening element such that said lock selectively enables said tightening The solid element is in a clamped position that is clamped within the output shaft and a release position that is removable from within the output shaft.

Preferably, the locking member comprises a body having a flat shape, the hole is axially penetrated through the main body, and an inner side wall of the hole is provided with a locking portion, and the locking device is fastened by the locking portion The stem of the component cooperates to grip or release the stem of the fastening element.

Preferably, the locking member has two positions of inclination and vertical with respect to a longitudinal axis of the output shaft, and in the inclined position, the locking portion of the locking member interferes with the rod portion of the fastening member to clamp the position The fastening element; in the vertical position, the locking portion of the locking member is disengaged from the stem portion of the fastening member to release the fastening member.

Preferably, the fastening element comprises a pressure plate, the rod portion extends axially from the center of the pressure plate, and the rod portion is provided with a plurality of grooves in the circumferential direction, and the fastening element is clamped by the locking member. The locking portion of the fastener is just snapped into the recess.

Preferably, the radial dimension of the hole of the fastener gradually decreases from the two ends to the middle portion, the hole has an upper inner surface and a lower inner surface which are arranged in a circular shape and are symmetrically disposed, and the locking portion is disposed in the upper portion. Between the surface and the lower inner surface. By providing a sloping lower inner surface, the fastening element can be guided smoothly into the hole of the lock, further cooperating with the locking portion located in the hole.

Preferably, the power tool further includes a self-locking sleeve, the self-locking sleeve includes a sleeve and a self-locking cavity connected to the sleeve, and the lock is received in the self-locking cavity, The lock cavity includes a side wall and a top wall, and an opening is formed at one side of the side wall, and a mounting opening opposite to the opening is formed on the other side of the side wall, and the lock is provided to be received in the A pivot joint in the opening.

Preferably, a first elastic member is disposed between the opposite end of the main body of the fastener and the top wall of the self-locking sleeve.

Preferably, the first elastic members are two and symmetrically disposed with respect to the pivot joint, so that the lock member is smoothly held in the self-locking cavity of the self-locking sleeve.

Preferably, an outer side of the side wall of the self-locking cavity is provided with an anti-rotation groove, and an inner portion of the output shaft is further provided with an anti-rotation pin, and the anti-rotation pin is received in the anti-rotation groove to limit the self-locking Radial rotation of the casing.

Preferably, the actuating assembly comprises an operating member disposed on the head casing and a pressing rod disposed in the output shaft, and the pressing rod is mounted with a second thread for moving the pressing rod in the axial direction. An elastic member, the operating member can press the pressing rod to move axially downward, and drive the locking member to move around in the axial direction A linear rotation perpendicular to the longitudinal axis of the output shaft.

Preferably, the output shaft is provided with a stopping member extending into the inner portion of the output shaft, and when the pressing rod drives the locking member to move downward under the action of the operating member, one end of the locking member is abutted Rely on the stop.

Preferably, the power tool further includes an elastic clamping member disposed at a free end of the output shaft, the working head is radially sleeved on the clamping member, and the free end of the output shaft is disposed to extend into the a push rod in the clamping member, the quick-change clamping device can drive the clamping member to move relative to the push rod along a longitudinal axis of the output shaft, and the push rod can open the clamping member The working head is clamped radially.

The beneficial effects of the present invention are: By providing a locking member in the internal chamber of the output shaft, the user only needs to operate the assembly, that is, the clamping and releasing of the fastening member by the locking member can be achieved. Therefore, the working head can be fastened to the output shaft in a reliable and reliable manner, and the manner in which the fastening element is originally required to be removed by means of the tool can be spliced, and has the advantages of a structural unit, convenient use, and strong clamping force. DRAWINGS

1 is a perspective view of a first embodiment of a power tool according to the present invention.

Figure 2 is a perspective exploded view of the power tool of Figure 1.

Figure 3 is a cross-sectional view showing the state of the first position of the power tool of Figure 1, wherein the quick-change clamping device is in the clamped position, and the working head holding the anti-slip mechanism is in the tensioned position.

Figure 4 is a cross-sectional view showing the second positional state of the power tool of Figure 1, in which the lock of the quick change clamp just abuts against the stop.

Figure 5 is a cross-sectional view showing the state of the fourth position of the power tool of Figure 1, wherein the working head holding the anti-slip mechanism is in the retracted position.

Fig. 6 is a partially enlarged schematic view showing the position A in Fig. 3.

Fig. 7 is a partially enlarged schematic view showing the position B of Fig. 4.

Figure 8 is an enlarged partial cross-sectional view showing the third positional state of the power tool of Figure 1, wherein the quick-change clamping device is in the released position.

Figure 9 is a partially enlarged schematic view of the position C in Figure 5.

Figure 10 is a perspective view of the self-locking sleeve of Figure 2.

Figure 1 1 is a perspective view of the fastener in Figure 2.

Figure 12 is a perspective view of the self-locking assembly of Figure 2.

Figure 13 is a cross-sectional view of the self-locking assembly of Figure 12.

Figure 14 is a cross-sectional view of the self-locking assembly of Figure 2 mated with the chamber of the output shaft. 15 is an exploded schematic view of the working head holding anti-slip mechanism in FIG.

16 is a schematic view in which the holding member of the working head holding the anti-slip mechanism is radially expanded and tensioned.

17 is a schematic view in which the holding member of the working head holding the anti-slip mechanism is in a state of being radially contracted and closed.

Figure 18 is a schematic view showing the cooperation of the fastener and the '-solid element in the second embodiment.

Figure 19 is a schematic view showing the cooperation of the fastener and the '-solid element in the third embodiment.

Figure 20 is a schematic view showing the cooperation of the fastener and the '-solid element in the fourth embodiment.

Figure 21 is a schematic view showing the cooperation of the fastener and the '-solid element in the fifth embodiment.

Figure 22 is a schematic view showing the cooperation of the lock member and the '-solid member in the sixth embodiment.

Figure 23 is a schematic view showing the fastener in the seventh embodiment.

Figure 24 is a schematic view showing the fastener in the eighth embodiment.

Figure 25 is a schematic view showing the fastener in the ninth embodiment.

Fig. 26 is a schematic view showing the holding anti-slip mechanism in the tenth embodiment.

Figure 27 is a schematic view showing the anti-slip mechanism of the eleventh embodiment.

Figure 28 is a schematic view showing the clamping anti-slip mechanism in the twelfth embodiment.

Figure 29 shows a schematic view of the bushing in Figure 28.

The corresponding component numbers in the illustration are as follows:

1. Case 22. Vertical part 321. Main body

100. Operating member 220. Second elastic member 322. Pivot joint

101. First rotating surface 23. Bearing 323. Perforation

102. Second rotating surface 24. Bearing 324. Locking

110. Cam portion 230. Baffle 3241. Coating

120. Pivot pin 240. Pressure head 3242 . Depression

130. Support frame 250. Pressure rod tail 324'. Locking part

140. Support frame 260. Gasket 324" . Locking

150. Handle 3. Output shaft 325. Upper inner surface

151. Pivot joints 300. Self-locking components 326. Lower inner surface

2. Head shell 31. Upper housing 327. First groove

200. Pressure 4 dry components 310. Self-locking sleeve 328. First elastic member

21. Horizontal part 32. Lower case 33. Chamber

210. Pressure bar 320. Locking 330. Casing 34. Upper surface 450, . Gasket 6. Working head

340 . Self-locking cavity 50. Fastening element 61. Mounting hole

341 . Side wall 501. . Pressure plate 700. Push rod

342 . Top wall 502. . Rod 701. Boss

343 . Opening 503. Mating portion 702. Third KJ slot

344 . Mounting port 51. Fastening element 703. Transmission parts

345 . Anti-rotation groove 511. Pressure plate 710. Clamping parts

347, . Second groove 512. Rod 711. Flange

35. Lower surface 513. Mating part 712. Fourth groove

36. Shaft shoulder 514. Groove 800. Push rod

37. Anti-revolution 52. Fastening element 801. Boss

38. Containment 孑 L 521. Pressure plate 802. Third groove

39. Stop pin 522. Rod 803. 夕 thread

4. Switch 523. Mating part 810. Clamping parts

400. Push rod 53. Fastening element 811. Flange

401. Boss 531. Platen 812. Pawl

402. First bevel 532. Rod 813. Internal thread

410. Clamping parts 533. Mating part 900. Putter

411. Flange 54. Fastening element 901. Boss

412. Pawl 541. Platen 910. Clamping parts

413. Containment cavity 542. Rod 911. Flange

414. Second bevel 543. Mating part 912. Pawl

415. Mounting section 55. Fastening element 913. Raised

420. Hollow bushing 551. Pressure plate 920. Bushing

421. Inner end face 552. Rod 921. Guide groove

430. Third elastic member 553. Mating portion 922. Track

440. Pins 554. Coatings

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

Referring to FIG. 1 and FIG. 2, a power tool, in particular, an oscillating machine, comprising a casing 1 extending longitudinally and a head connected to the front end of the casing 1 (defined as the front end in the right side of FIG. 1) Shell 2 and self An output shaft 3 extending from the head casing 2. A motor (not shown) is disposed in the casing 1, and a switch 4 is further disposed on the casing 1 to control the opening or closing of the motor. The head case 2 includes a horizontal portion 21 connected to the cabinet 1 and disposed in the horizontal direction in Fig. 1 and a vertical portion 22 extending substantially vertically downward from the end of the horizontal portion 21. The output shaft 3 is disposed in a vertical direction, one end of which is mounted in the head casing 2, and the other end extends downward from the vertical portion 22 of the head casing 2, and is oscillatingly movable about its longitudinal axis X, such as a swinging direction The double arrow in Figure 1 shows.

In addition, an eccentric wheel (not shown) and a fork assembly (not shown) commonly used in the swing machine are also provided inside the head casing 2 for converting the rotational output torque of the motor into the output shaft 3. Swing output torque. As shown in FIG. 1, a working head 6 can be mounted on the free end of the output shaft 3 via a fastening member 50. In the present embodiment, the working head 6 is a straight saw blade, and the working head 6 is driven by the output shaft 3. The oscillating motion can be made in the direction of the double arrow in Fig. 1. The fastening member 50 includes a flat platen 501 and a stem portion 502 extending upward from the center of the presser plate 501. The end of the stem portion 502 is provided with a fitting portion 503 having a smooth cylindrical surface.

Referring to Figures 2 and 3, the oscillating machine includes a quick change clamp that is changeable in a release position and a clamp position for quickly disassembling the fastening member 50 mounted at the end of the output shaft 3. The quick change clamping device includes a self-locking assembly 300 disposed within the output shaft 3 and capable of clamping or releasing the fastening member 50 and a brake assembly for clamping or releasing the fastening member 320. In this embodiment, the brake assembly includes an operating member 100 disposed on the horizontal portion 21 of the head casing 2 and a pressure bar assembly 200 selectively contacting the operating member 100. The self-locking assembly 300 includes a self-locking sleeve 310 and receiving The lock 320 is within the self-locking sleeve 310. In the present embodiment, the output shaft 3 includes an upper casing 31 and a lower casing 32, which are respectively supported by upper and lower bearings 23, 24 located inside the head casing 2. When the upper casing 31 and the lower casing 32 are integrally connected, the inside of the output shaft 3 is formed with a chamber 33 having oppositely disposed upper surfaces 34 and lower surfaces 35 in the axial direction, and the above The plunger assembly 200 and the self-locking assembly 300 of the quick change clamp are disposed in the chamber 33 of the output shaft 3.

2 and FIG. 3, the operating member 100 is a cam wrench including a separately disposed handle 150 and a cam portion 110. The end of the handle 150 is provided with two parallel opposing pivot joints 151. When the handle 150 is rotated, the cam is driven. The portion 110 is rotated. In addition, two support frames 130 and 140 are disposed on the horizontal portion 21 of the head case 2, and the pivot joint 151 of the handle 150 is placed between the support frames 130 and 140. The cam portion 110 is further placed on the two pivot joints 151. The handle 150 and the cam portion 110 are pivotally connected between the two support frames 130, 140, respectively, by a pivot pin 120. The cam portion 110 has two arcuate rotating surfaces 101, 102 with respect to the pivot pin 120, wherein the distance of the first rotating surface 101 from the pivot pin 120 is smaller than the distance from the second rotating surface 102 to the pivot pin 120. the distance. The user can rotate the operating member 100 between two rotational positions by pulling the handle 150. In the first rotational position, the first rotating surface 101 of the cam portion 110 is disengaged from the pressing rod assembly 200, and in the second rotation. Positionally, the second rotating surface 102 of the cam portion 110 is in contact with the strut assembly 200. It should be noted that the first rotating surface 10 1 of the cam portion 1 10 and the pressing rod assembly 200 may not be disengaged, but are always in contact with the pressing rod assembly 200 during the rotation of the operating member 100 as long as the first rotating surface The distance from the pivot pin 120 is less than the distance of the second rotating surface 102 from the pivot pin 120.

Continuing to refer to Figures 2 and 3, the above-described strut assembly 200 includes a strut 210, a second resilient member 220, and a spacer 260 located below the second resilient member 220. A baffle 230 is formed on the press bar 2 10 in a radial direction, by means of which the press bar 210 can be divided into two parts, that is, a press bar extending from the horizontal portion 21 of the head case 2 The head 240 and the circumferential diameter are slightly smaller than the strut tail 250 of the plunger head 240. Wherein, the pressure bar head 240 extends out of the head case 2, is located below the pivot pin 120 and opposite the cam portion 110, and the press bar tail 250 is mated with the self-locking assembly 300 also disposed inside the output shaft 3. In addition, the second elastic member 220 is sleeved on the presser tail 250, one end of which abuts the baffle 230, and the other end is located in the chamber 33 of the output shaft 3 and is also sleeved on the tail end 250 of the press rod. The spacers 260 are abutted. It should be noted that in the inner chamber 33 of the output shaft 3, a shoulder portion 36 is also formed, and the spacer 260 is disposed on the shoulder portion 36 to restrict the axial movement of the second elastic member 220.

Referring to Figure 3, Figure 4, Figure 8, and Figure 5, the operating members 100 are sequentially located at the first, second, third, and fourth rotational positions, respectively. The strut assembly 200 is disposed in the internal chamber 33 of the output shaft 3 and is movable in the axial direction of the output shaft 3 in accordance with the rotation of the operating member 100. As shown in FIG. 3, when the user rotates the operating member 100 to the first rotational position, the first rotating surface 101 and the pressing head 240 are disengaged, and at this time, the elastic force of the pressing rod 2 10 at the second elastic member 220 Moving to the top of the inner chamber 33 of the output shaft 3, the baffle 230 is in contact with the upper surface 34 of the inner chamber 33. As shown in FIG. 4, FIG. 8 and FIG. 5, when the user rotates the operating member 100 to the second rotational position to the fourth rotational position, the second rotating surface 102 and the pressure head 240 are always in contact with each other. During the process, the pressing rod 210 moves along the axial direction of the output shaft 3 away from the operating member 100 under the action of the operating member 100, and compresses the second elastic member 220 through the baffle 230, so that the second elastic member 220 is in a contracted state. .

Referring to Figures 2, 10-13, the self-locking assembly 300 includes a self-locking sleeve 3 10 and a lock 320 located within the self-locking sleeve 3 10 . The self-locking sleeve 3 10 is substantially stepped, and includes a sleeve 330 having a substantially hollow cylindrical shape and a self-locking cavity 340 connected to the sleeve 330 and also having a hollow cylindrical shape, and the self-locking cavity 340 The radial dimension is greater than the radial dimension of the sleeve 330. The above pressure bar 210 The plunger tail 250 is inserted and secured in the sleeve 330 so that the sleeve 330 can be moved in the axial direction. The self-locking cavity 340 is for receiving the locking member 320, and includes a side wall 341 and a top wall 342, and a circular opening 343 is formed in the side wall 341. A square mounting opening 344 is formed on the other side of the side wall 341 with respect to the opening 343 for mounting the locking member 320 in the self-locking cavity 340. The locker 320 includes a body 321 in the form of a flat plate that can be inserted into the self-locking cavity 340 from the mounting opening 344. Moreover, the locking member 320 has a pivot joint 322 extending from one side of the main body 321 corresponding to the opening 343, and the pivot joint 322 can be inserted into the opening 343. The main body 321 of the locker 320 is provided with a through hole 323 penetrating in the axial direction of the output shaft 3 for insertion of the fastening member 50, and the inner side wall of the through hole 323 is provided with a locking portion 324. When the locking member 320 is axially inclined at an angle as a whole, the locking portion 324 can be mated with the outer surface of the mating portion 503 of the fastening member 50 to clamp the fastening member 50.

It should be noted that, in the present embodiment, the perforation 323 is not a standard cylindrical shape, but is substantially in the shape of an inner spindle, and specifically, the radial dimension from the both ends to the middle portion is gradually reduced. The perforation 323 has an upper inner surface 325 and a lower inner surface 326 which are arranged in a circular table shape and are symmetrically disposed. The locking portion 324 is disposed between the upper inner surface 325 and the lower inner surface 326 and has an inner surface which is a smooth cylindrical surface. On the main body 321 of the locker 320, with respect to one end of the pivot joint 322, two side-by-side first grooves 327 are also disposed along the axial direction of the output shaft 3. In contrast, the first recess 327 is also disposed on the top wall 342 of the self-locking cavity 340, and the two first recesses 327 are respectively inserted into the first recess 327 and the second. In the groove 347. By providing the first elastic member 328, the lock member 320 can be held in the tilt lock position in the initial state.

In addition, referring to Fig. 2, Fig. 12 and Fig. 14, on the outer side of the side wall 341 of the self-locking cavity 340, an anti-rotation groove 345 is further provided. Corresponding to the anti-rotation groove 345, an anti-rotation pin 37 is further disposed in the inner chamber 33 of the output shaft 3, and the anti-rotation pin 37 is directly received in the anti-rotation groove 345 for limiting the radial direction of the self-locking assembly 300. Rotate.

The output shaft 3 is further provided with a stopping member extending into the chamber 33. When the pressing rod 3 10 moves the self-locking assembly 300 axially downward under the action of the operating member 100, one end of the locking member 320 abuts against the above. The stop, thereby moving the lock 320 from the tilted position to a vertical position perpendicular to the longitudinal axis of the output shaft 3. Specifically, referring to FIG. 2 and FIG. 3, in the embodiment, the stopper is a stopper pin 39. On the lower casing 32, a receiving hole 38 is provided along the extending direction of the locking member 320, and the above-mentioned stopper pin 39 is mounted in the receiving hole 38. In the axial direction, the stop pin 39 is located directly below the lock 320.

Referring to FIG. 3 to FIG. 9, the specific operation process of the quick-change clamping device of the power tool of the present invention is as follows. When the fastening member 50 is inserted into the self-locking assembly 300, that is, the stem portion 502 of the fastening member 50 is inserted. After the perforation 323 in the locker 320, as shown in FIG. 4 and FIG. 7, when the user rotates the operating member 100 to the second rotational position, the pressure bar assembly 200 is caused to drive the self-locking sleeve 3 10 along the output. The longitudinal axis of the shaft 3 moves away from the operating member 100, at which time the body 321 of the locking member 320 comes into contact with the stop pin 39 and is blocked by the stop pin 39.

As shown in FIG. 8, the operating member 100 continues to rotate to the third rotational position, and the pressing rod assembly 200 is further axially moved downward, thereby driving the self-locking assembly 300 to continue axially downward; one end of the locking member 320 is stopped by the pin. 39, the other end of the pivot joint 322 continues to move axially downwards by the self-locking sleeve 3 10, thereby integrally rotating around a line perpendicular to the longitudinal axis of the output shaft 3 to a horizontal position, and relative to the output shaft The longitudinal axis of 3 is in a vertical position; at this time, the locking portion 324 in the through hole 323 of the locking member 320 is not in contact with the engaging portion 503 of the fastening member 50, and the fastening member 50 is released, which can be easily Removed from output shaft 3.

As shown in Figures 3 and 6, when the user rotates the operating member 100 back to the first rotational position, the plunger assembly 200 will move the self-locking sleeve 3 10 axially upward, and further, with the aid of the fastener The mating between the pivot joint 322 of the 320 and the circular opening 343 on the self-locking cavity 340 also drives the lock 320 up. At the same time, since the first elastic member 328 is disposed between the other end of the locking member 320 and the self-locking cavity 340, the other end of the locking member 320 is not moved upward by the elastic force, and the final result is the locking device. 320 is restored within the self-locking cavity 340 to a state that is inclined relative to the longitudinal axis of the output shaft 3, and in turn clamps the fastening element 50, and the angle of inclination θ of the fastener 320 in the horizontal direction is at least 4.7. .

As shown in FIG. 11, a lateral clamping force is generated between the locking portion 324 in the through hole 323 and the engaging portion 503 of the fastening member 50, and at the same time, the main body 321 and the stopper pin 39 of the locking member 320 are not produced. Contact, thereby tightly clamping the stem 502 of the fastening element 50 to the fastener 320. It should be noted that the size of the tilt angle 是 is determined according to the specific size of the fastener 320 and the fastening component 50 and the friction coefficient between the two. Therefore, the inclination angle 会 will vary with the lock 320 and The specific dimensions and materials of the fastening elements 50 vary.

On the other hand, when the user rotates the operating member 100 to the third rotational position again, the pressing rod assembly 200 moves downward against the elastic force of the second elastic member 220, and the self-locking sleeve 3 10 is also moved downward, so that the locking member 320 is restored to In the horizontal state, the lateral clamping force generated between the locking portion 324 of the locking member 320 and the fastening member 50 is unloaded, so that the fastening member 50 can be freely moved axially and detached by the user. In addition, in the second rotational position between the first rotational position and the third rotational position, the operating member 100 is rotated as shown in FIGS. 4 and 6, the self-locking assembly 300 is axially moved downward by a distance, The main body 321 of the locking member 320 comes into contact with the stopper pin 39, and the inclination angle of the locking member 320 becomes small, but the locking member 320 has not yet arrived. Up to the vertical position, the force between the fastening element 50 and the lock 320 is reduced. With such a quick-change clamping device, the user can quickly mount the fastening member 50 to the output shaft 3 or quickly remove the fastening member 50 from the output shaft 3 by merely operating the operating member 100. Quickly install or replace the work head for quick and easy operation and strong clamping force.

Referring to FIG. 2, the power tool further includes a working head clamping anti-skid mechanism for preventing the radial clamping force of the output shaft 3 and the working head 6 from being attached to the output shaft 3 after the working head 6 is connected to the output shaft 3. And the phenomenon that the work head 6 slips.

Referring to FIG. 15 to FIG. 17, the clamping anti-slip mechanism includes a push rod 400 extending downward from the free end of the output shaft 3, a hollow sleeve 420 connected to the end of the output shaft, and being received in the sleeve 420. A hollow clamping member 410 for mounting the working head. The clamping member 410 is sleeved on the push rod 400, and a third elastic member 430 is axially disposed between the clamping member 410 and the sleeve 420, so that the clamping member 410 can move axially relative to the sleeve 420.

Further, a rib-shaped boss 401 is extended at the end of the push rod 400, and a side surface of the boss 401 is formed as a first slope 402. The clamping member 410 itself is an elastic material, and includes a flange portion 411 and a pawl 412 extending downward from one side of the flange portion 411. The pawl 412 is substantially cylindrical and is radially spaced apart into the same size. Six equal parts. The end of the pawl 412 is provided with a mounting portion 415 for mounting the working head 6 and having a hexagonal cross section. The inside of the pawl 412 is formed with a hexagonal-shaped receiving cavity 413, and the receiving cavity 413 and the protruding rod 400 are convex. The table 401 is fitted and sleeved on the outside of the boss 401. A second inclined surface 414 is formed in the receiving cavity 413 of the holding member 410 with respect to the first inclined surface 402 of the push rod 400. The sleeve 420 has an inner end surface 421 along the axial direction and a spacer 450 on the inner end surface 421. The third elastic member 430 is sleeved on the pawl 412, one end of which is in contact with the flange portion 411 of the clamping member 410, and the other end is in contact with the spacer 450 on the inner end surface 421 of the sleeve 420. Additionally, the flange portion 411 is selectively coupled to the self-locking assembly 300 by a plurality of pins 440 extending through the lower surface 35 of the interior chamber 33 to permit the clamp member 410 to move in the axial direction. The bottom end of the pin 440 abuts against the upper surface of the flange portion 411 of the holder 410, and the top end thereof opposes the bottom of the self-locking sleeve 310 of the self-locking assembly 300. With the above structure, the outer radial dimension of the mounting portion 415 of the pawl 412 of the clamp member 410 can be made at the first radial dimension A of the clamping work head 6 and the second radial dimension B of the release working head 6. Change between.

Referring to Figures 3 and 16, when the operating member 100 is in the first rotational position, the self-locking sleeve 310 of the self-locking assembly 300 is disengaged from the pin 440 and the fastening member 50 is clamped. At this time, under the action of the third elastic member 430, the second inclined surface 411 of the clamping member 410 abuts against the first inclined surface 402 of the push rod 400, so that the mounting portion 415 of the pawl 412 of the clamping member 410 is Maintain maximum in the radial direction The outer radial dimension, i.e., the first radial dimension A, in turn, exerts a maximum lateral force on the mounting aperture 61 of the working head 6, preventing the working head 6 from slipping laterally during the swing.

As shown in Figures 9 and 17, after the user toggles the operating member 100 to the fourth rotational position, the plunger assembly 200 will move the self-locking assembly 300 further axially downward. After the self-locking assembly 300 is axially moved down a certain distance, the bottom of the self-locking sleeve 310 will contact the top end of the pin 440, and the pressure is transmitted to the clamping member 410 by the pin 440, thereby driving the clamping member 410. Move down axially. After the clamp member 410 is axially moved downward, the second ramp 411 of the clamp member 410 will disengage from the first slope 402 of the push rod 400 since the push rod 400 remains stationary in the axial direction. Moreover, due to the elasticity of the pawl 412 of the clamping member 410, when the second inclined surface 411 of the clamping member 410 is disengaged from the first inclined surface 402 of the push rod 400, the pawl 412 is contracted to the initial state, and the pawl 412 is mounted. The outer radial dimension of the portion 415 becomes the smallest second radial dimension B, and the lateral force applied by the pawl 412 to the mounting hole 61 of the working head 6 is then unloaded. At this time, the user first removes the fastening member 50, and then the working head 6 can be easily removed from the holder 410.

On the contrary, when the user needs to reinstall the unloaded working head 6, only when the operating member 100 is in the second rotational position, the working head 6 is first mounted to the end of the clamping member 410, and then the fastening member 50 is used. Inserted into the self-locking assembly 300 in the output shaft 3; the operating member 100 is then pulled to the first rotational position, during which the operating member 100 undoes the force on the pressing rod assembly 200, in the second elastic member 220. Under the action of the pressure bar assembly 200, the self-locking assembly 300 is moved up to the initial position, the bottom of the self-locking sleeve 310 will be gradually separated from the top end of the pin 440; the clamping member 410 is in the third elastic member. The elastic force of the 430 is axially moved upward, so that the second inclined surface 411 is gradually fitted to the first inclined surface 402 of the push rod 400, and the pawl 412 of the clamping member 410 is gradually convex by the push rod 400 in the radial direction. The table 401 is opened to clamp the working head 6 by applying a sufficient lateral clamping force to the mounting hole 61 of the working head 6 through the mounting portion 415, thereby preventing the working head 6 from being opposed to the clamping member 410 during operation. Rotate, guarantee output 3 the rotational torque transmitted through the holder 410 to better working head 6, the working head 6 has a higher efficiency.

In the first embodiment described above, the inner surface of the locking portion 324 of the locking member 320 of the quick-change clamping device is a smooth cylindrical surface, and the engaging portion 502 of the fastening member 50 and the locking portion 324 also has a smooth cylindrical surface. . The cooperation of the fastener and the fastening member of the present invention is not limited to the above embodiment, and other embodiments of the present invention will be further described below with reference to Figs. 18 to 23 .

Referring to Figure 18, the second embodiment of the present invention is substantially identical in construction to the first embodiment described above, except for the fastening member 51. In the present embodiment, the fastening member 51 also includes a flat platen 511 and a rod portion 512 extending upward from the center of the pressure plate 511. A fitting portion 513 that cooperates with the locking portion 324 of the above-described fastener 320 is provided. The difference is that a plurality of recesses 514 are formed in the circumferential direction of the engaging portion 513. When the fastening member 51 is clamped by the locking portion 324 of the locking member 320, the locking portion 324 is just retained in the recess 513. By providing the grooves 513 in the mating portions 512 of the fastening elements 51, it is ensured that there is a greater axial force between the fastening elements 51 and the locking portions 324 of the locking members 320 in the clamped position, thereby The fastening member 51 is prevented from slipping and moving axially.

Referring to Fig. 19, in the third embodiment of the present invention, the difference from the first embodiment is also in the fastening member 52. In the present embodiment, the fastening member 52 also includes a flat plate-shaped pressure plate 521 and a rod portion 522 extending upward from the center of the pressure plate 521. The end portion of the rod portion 522 is also provided with a fitting portion 523 that cooperates with the locking portion 324 of the above-mentioned fastener 320. . The difference is that the shape of the fitting portion 523 is not a cylindrical shape, but a waist shape which is gradually reduced from the both ends to the intermediate diameter, and the axial action between the engaging portion 523 and the locking portion 324 of the lock member 320 can also be increased. The force, thereby preventing the fastening element 52 from slipping and moving axially.

Referring to Fig. 20, in the fourth embodiment of the present invention, the difference from the foregoing embodiment is also in the fastening member 53. In the present embodiment, the fastening member 53 also includes a pressing plate 531 and a rod portion 532 extending upward from the center of the pressing plate 531. The end portion of the rod portion 532 is also provided with a fitting portion 533 that cooperates with the locking portion 324 of the locking member 320. The difference is that the fitting portion 533 of the fastening member 53 has a small top end and a middle portion of a wine barrel shape which allows the rod portion 532 of the fastening member to be more easily inserted into the through hole 323 of the lock member 320.

Referring to Fig. 21, in the fifth embodiment of the present invention, the difference from the foregoing embodiment is also in the fastening member 54. In the present embodiment, the fastening member 54 also includes a flat plate-shaped pressure plate 541 and a rod portion 542 extending upward from the center of the pressure plate 541. The end portion of the rod portion 542 is also provided with a fitting portion 543 that cooperates with the locking portion 324 of the above-mentioned fastener 320. . The difference is that the engaging portion 543 of the fastening member 54 is substantially in the shape of a truncated cone, and the structure can also increase the axial force between the engaging portion 543 and the locking portion 324 of the locking member 320, preventing the fastening member 54 from slipping. And the axial movement.

Referring to Fig. 22, in the sixth embodiment of the present invention, the fastening member 55 and the lock member 320 are different from the foregoing embodiment. In the present embodiment, the fastening member 55 also includes a flat plate-shaped pressure plate 551 and a rod portion 552 extending upward from the center of the pressure plate 551. The end portion of the rod portion 552 is also provided with a fitting portion 553 that cooperates with the locking portion 324 of the above-mentioned fastener 320. . The difference is that the outer surface of the engaging portion 553 of the fastening member 55 and the inner surface of the locking portion 324 of the locking member 320 are respectively coated with friction layers 554, 3241 to increase the locking portion 324 and the fitting portion 553. The clamping force between the two prevents the fastening member 55 from slipping and moving axially. Please refer to FIG. 23 to FIG. 25, which are respectively the seventh to ninth embodiments of the present invention. As shown in FIG. 23, in the seventh embodiment, the inner surface of the locking portion 324 of the locking member 320 is further provided with a recessed portion 3242 to increase the force between the locking portion 324 and the engaging portion of the fastening member. . As shown in FIG. 24, in the eighth embodiment, the inner surface of the locking portion 324' of the locking member 320 is not a smooth cylindrical surface, but a partially spherical surface that protrudes outward; likewise, as shown in FIG. 25, the ninth In the embodiment, the inner surface of the locking portion 324" of the locking member 320 is in the shape of a truncated cone, and the locking portions 324' and 324" can be well matched with the mating portions of the fastening member.

In the above embodiment, various structural cooperation modes of the engaging portion of the locking member of the present invention and the engaging portion of the fastening member are respectively shown. In addition to the above matching manner, the inner surface of the locking portion of the locking member may be provided with an internal thread, and correspondingly, the outer surface of the engaging portion of the fastening member is provided with an external thread, and the locking member is in the tilt locking position. The thread is mated with the external thread so that the locking portion of the locking member can stably hold the engaging portion of the fastening member.

It is to be understood that the grip anti-slip mechanism in the present invention is not limited to the structure used in the above embodiment. As long as the clamping member is movable relative to the push rod on the longitudinal axis of the output shaft, the clamping member is expanded by the push rod to have a larger first radial dimension to clamp the working head or to contract and have a smaller second Radial size to release the working head. Next, the nip prevention mechanism in the tenth to twelfth embodiments of the present invention will be further described with reference to Figs. 26 to 29, respectively.

Referring to Fig. 26, in the tenth embodiment of the present invention, the boss 701 at the end of the push rod 700 has a truncated cone shape instead of a hexagonal prism. A third groove 702 is defined in a sidewall of the lower casing 32 of the output shaft, and a transmission member 703 extending in the axial direction from the third groove 702 is further disposed in the third groove 702. The third recess 702 of the flange portion 71 1 of the clamping member 710 corresponding to the lower housing 32 is provided with a fourth recess 7 12 , and after assembly, the transmission member 703 partially protrudes into the fourth recess 7 12 . In the first embodiment, the boss 401 at the end of the push rod 400 has a hexagonal shape, and the lower casing 32 of the output shaft transmits torque to the holder 4 10 through the boss 401. In the present embodiment, the lower housing 32 of the output shaft transmits torque to the holder 710 via the transmission member 703.

Referring to FIG. 27, in the eleventh embodiment of the present invention, the quick change clamp device, the boss 420, the third elastic member 430, and the spacer 450 in the first embodiment are not provided. In the present embodiment, the nip prevention mechanism includes only the push rod 800 and the elastic holding member 810 which are disposed at the end of the lower casing 32 of the output shaft. The end of the push rod 800 is provided with a truncated cone 801, and the top end of the push rod 800 is provided with an external thread 802. The clamping member 8 1 0 includes a flange portion 8 1 1 and a pawl 8 12 . The inner side wall of the clamping member 8 10 is provided with an internal thread 8 13 engageable with the external thread 802 of the push rod 800. The clamping member 8 10 is coupled to the push rod 800 by the internal thread 8 13 and the external thread 802 of the push rod 800, and the rotating clamping member 8 10 can be clamped. The member 810 is moved up and down along the longitudinal axis of the output shaft such that the boss 801 of the push rod 800 is engaged or disengaged from the pawl 812 of the clamp member 810, causing the pawl 812 to be expanded or contracted, thereby being radially clamped. Or release the work head (not shown).

Referring to Fig. 28 and Fig. 29, in the twelfth embodiment of the present invention, the quick change clamp, the third elastic member 430, and the spacer 450 in the first embodiment are not provided. In this embodiment, the clamping anti-slip mechanism includes a push rod 900 disposed at an end of the lower housing 32 of the output shaft, a sleeve 920 connected to the end of the lower housing 32, and a sleeve disposed around the push rod 90 and received in the sleeve 920. Clamping member 910. The sleeve 920 is radially rotatable relative to the lower housing 32. The inner side wall of the sleeve 920 is axially provided with a guiding groove 921 and a spiral track 922 disposed radially and communicating with the guiding groove 921. The clamping member 910 includes a flange portion 911 and a pawl 912 extending from a side of the flange portion 911. The outer side wall of the pawl 912 is provided with a projection 913. The projection 913 can be received in the guide groove 921 and the rail 922, and can slide in the guide groove 921 and the rail 922.

When assembled, the protrusion 913 of the clamping member 910 is first aligned with the guiding groove 921 of the sleeve 920 and axially slid into the guiding groove 921, so that the clamping member 910 is received in the sleeve 920. The sleeve 920 carrying the clamping member 910 is then coupled to the free end of the lower housing 32, at which time the inner side wall of the clamping member 910 mates with the ribbed boss 901 of the push rod 900, the clamping member 910 The radial rotation is limited by the boss 901. Next, a working head (not shown) is mounted on the pawl 912 of the clamping member 910, and then the sleeve 920 is rotated clockwise so that the projection 913 of the clamping member 910 slides within the rail 922 of the sleeve 920. At the same time, the clamping member 910 is moved upwardly in the axial direction, so that the clamping member 910 is engaged with the boss 901 of the push rod 900 to be expanded, so that the radial dimension of the pawl 912 of the clamping member 910 is increased in the diameter. Clamp the working head up. Obviously, after the working head is radially clamped, the sleeve 920 is rotated counterclockwise, and the clamping member 910 is driven by the sleeve 920 to move axially downward and separate from the push rod 900, thereby making the diameter of the pawl 912 The size is reduced to release the work head.

Claims

Claim

What is claimed is: 1. A power tool comprising a head case, an output shaft extending from the head case and for driving a work head, and a fastening member mounted on the output shaft and for fixing the work head, the tight The solid element is provided with a rod portion extending into the output shaft, the power tool further comprising a quick change clamping device, the quick change clamping device comprising a lock provided in the output shaft and allowing the lock to be relatively An actuating assembly for moving the fastening element, wherein: the lock is provided with a hole, a rod portion of the fastening element passes through a hole of the lock, and the actuating assembly drives the lock The firmware rotates about a line perpendicular to a longitudinal axis of the output shaft, the aperture of the lock optionally mating with a stem of the fastening element such that the fastener selectively causes the fastening element A clamping position that is clamped within the output shaft and a release position that is removable from the output shaft.

2. The power tool according to claim 1, wherein: the lock body comprises a body having a flat shape, the hole is axially penetrated through the main body, and a locking portion is disposed on an inner side wall of the hole. The fastener cooperates with the stem of the fastening element by the locking portion to clamp or release the fastening element.

3. The power tool according to claim 2, wherein: the locking member has two positions of inclination and vertical with respect to a longitudinal axis of the output shaft, and in the inclined position, the locking portion of the locking member is The stem of the fastening element interferes to grip the fastening element; in the vertical position, the locking portion of the fastener disengages from the stem of the fastening element to release the fastening element.

4. The power tool according to claim 3, wherein the fastening member comprises a pressure plate, the rod portion extends axially from a center of the pressure plate, and the rod portion is provided with a plurality of grooves in a circumferential direction. When the fastening element is clamped by the locking element, the locking portion of the locking element just snaps into the recess.

5. The power tool according to claim 2, wherein: a radial dimension of the hole of the fastener gradually decreases from both ends to a middle portion, the hole having an upper inner surface that is symmetrical and arranged symmetrically and a lower inner surface, the locking portion being disposed between the upper inner surface and the lower inner surface.

The power tool according to any one of claims 1 to 5, wherein: the power tool further comprises a self-locking sleeve, the self-locking sleeve comprising a sleeve and a self-locking connection under the sleeve a cavity, the lock is received in the self-locking cavity, the self-locking cavity includes a side wall and a top wall, and an opening is opened on one side of the side wall, and is formed on the other side of the side wall The mounting opening opposite to the opening, the locking member is provided with a pivot joint received in the opening.

7. The power tool according to claim 6, wherein: a first elastic member is disposed between an end of the main body of the fastener opposite to the pivot joint and a top wall of the self-locking sleeve.

8. The power tool according to claim 7, wherein: said first elastic member is two And symmetrically disposed relative to the pivot joint, such that the lock is smoothly retained within the self-locking cavity of the self-locking sleeve.

The swinging tool according to claim 8, wherein: an outer side of the side wall of the self-locking cavity is provided with an anti-rotation groove, and an inner portion of the output shaft is further provided with an anti-rotation pin, and the anti-rotation pin It is housed in the anti-rotation groove to limit the radial rotation of the self-locking sleeve.

10. The power tool according to claim 1, wherein: the actuating assembly comprises an operating member disposed on the head casing and a pressing rod disposed in the output shaft, the pressing rod is mounted a second elastic member for moving the pressing rod in the axial direction, the operating member pressing the pressing rod axially downward and driving the locking member to be perpendicular to the output while moving axially downward A linear rotation of the longitudinal axis of the shaft.

1 . The power tool according to claim 10, wherein: the output shaft is provided with a stopper extending into an inner portion of the output shaft, and the pressing rod drives the operation member under the action of the operating member When the lock is moved down, one end of the lock will abut against the stop.

12. The power tool according to claim 1, wherein: the power tool further comprises an elastic clamping member disposed at a free end of the output shaft, the working head being radially disposed on the clamping member, The free end of the output shaft is provided with a push rod extending into the clamping member, and the quick-change clamping device can drive the clamping member to move relative to the push rod along a longitudinal axis of the output shaft, The push rod can open the clamping member to radially clamp the working head.