TWI401141B - Pneumatic tool - Google Patents

Description

Pneumatic machine tool

The invention relates to a machine tool, in particular to a pneumatic machine tool.

Please refer to FIG. 1 , which illustrates a conventional pneumatic power tool. The pneumatic power tool 10 has a gun-shaped housing 11 , a drive shaft 12 , and a trigger 13 . A lock member (not shown) can be mounted on the front end of the drive shaft 12 . The lock member is a bolt or a nut. . In addition, the trigger 13 is used to illuminate an air intake device (not shown) installed inside the casing 11. When the trigger 13 is pressed, the drive shaft 12 rotates.

In addition, a knob 141 is disposed at the rear of the housing 11. The steering of the drive shaft 12 can be controlled by adjusting the knob 141. For example, after the knob 141 is rotated clockwise by a predetermined angle, the drive shaft 12 can be rotated clockwise. After the knob 141 is rotated counterclockwise by a predetermined angle, the drive shaft 12 can be rotated counterclockwise.

Please refer to FIG. 2 , which is a partial component of the pneumatic machine tool, from left to right: the cylinder 15 , the intake valve 16 , and the adjustment mechanism 14 . An impeller (not shown) is disposed inside the cylinder 15 , a vane is disposed on the impeller, the intake valve 16 includes a front cover 161 and a rear seat 162 , and the adjustment mechanism 14 includes a knob 141 and a linkage 142 . In FIG. 2, in addition to the knob 141, other components are located inside the housing 11. By rotating the knob 141, the link 142 and the intake valve 16 can be rotated. In addition, the rear end of the cylinder 15 is further provided with a forward rotation air inlet hole and a reverse rotation air inlet hole (not shown). By rotating the front cover 161, the forward rotation air inlet hole or the reverse rotation air inlet hole can be opened or closed to control The steering of the internal impeller of the cylinder 15 controls the steering of the drive shaft 12.

When the pneumatic machine tool 10 is in operation, the vibrations generated may cause the intake valve 16 to deviate from the original predetermined angle, resulting in the pneumatic machine tool 10 not functioning effectively. In order to maintain the intake valve 16 at a predetermined angle, it is currently practice to bring the O-ring 1621 on the rear seat 162 into intimate contact with the inner wall of the housing 11. The intake valve 16 can be maintained at a predetermined angle by the friction between the housing 11 and the O-ring 1621. However, as the friction between the housing 11 and the O-ring 1621 is greater, the user has to spend more effort to turn the knob 141, resulting in inconvenience in use. Moreover, the O-ring 1621 is a soft material, and the longer the use time, the more serious the problem of wear.

Therefore, how to design a pneumatic machine tool that can easily change the direction of rotation of the drive shaft by the user is a problem worthy of consideration in the art.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a pneumatic power tool that facilitates the user to change the direction of rotation of the drive shaft.

For the above and other purposes, the pneumatic machine tool includes a housing, a drive shaft, a cylinder, an intake valve, and a switching mechanism. The cylinder is disposed inside the casing and has a forward rotation air inlet and a reverse air intake hole. The intake valve is disposed behind the cylinder to close or open the forward air inlet or reverse the air inlet to adjust the steering of the drive shaft. The switching mechanism is disposed behind the intake valve and includes an adjustment mechanism, an elastic element, and a fixing bolt. The spring element exerts an elastic force on the adjusting mechanism, and a part of the volume of the adjusting mechanism is exposed outside the casing, and a sliding groove is disposed on the adjusting mechanism, and two slots are respectively disposed at two ends of the sliding groove. In addition, one end of the fixing bolt is fixed to the casing, and the other end protrudes into the sliding groove. Moreover, the adjusting mechanism is coupled to the intake valve. When the adjusting mechanism is rotated by a predetermined angle, the position of the fixing bolt corresponds to the card slot. At this time, the elastic force applied by the elastic member to the adjusting mechanism causes the fixing bolt to enter and engage. In the card slot.

In the above pneumatic machine tool, the intake valve has a blind hole, and the adjustment mechanism includes a trigger member and a connecting shaft. The triggering member is disposed above the housing, and the sliding groove is disposed on one side of the pulling member, and the elastic member applies an elastic force to the pulling member. The connecting shaft penetrates the trigger member, and one end of the connecting shaft is inserted into the blind hole. When the trigger member is pulled, the connecting shaft is driven, so that the connecting shaft drives the intake valve to close or open the forward air inlet or reverse the air inlet.

Moreover, the intake valve includes a front cover and a rear seat. The steering of the pneumatic power tool can be adjusted by turning the front cover to close or open the forward air inlet or reverse the air inlet. In addition, the rear seat is fixedly connected to the front cover, and the blind hole is disposed on the rear seat. In addition, the switching mechanism further includes a support collar that is located directly above the blind hole and bears against the intake valve. The elastic element is sleeved on the support collar, and the connecting shaft extends through the support collar.

In the above pneumatic power tool, the adjustment mechanism includes a knob and a linkage. The knob is disposed at the rear of the housing, and the linkage is disposed in the housing, and the linkage is coupled to the knob and the intake valve. In addition, the sliding groove is disposed on the linking member, and the elastic member applies the elastic force to the linking member. The adjustment mechanism further includes a plurality of latches, one end of the latch is inserted on the knob, and the other end of the latch is inserted on the linkage. With the latch, when the knob is rotated, the linkage will also rotate. Therefore, when the knob is rotated, the linkage is driven, so that the linkage drives the intake valve to close or open the forward intake or reverse the intake.

Since the pneumatic machine tool of the present invention fixes the intake valve by means of the engagement, it can be used for a long time without the problem of wear of the conventional O-ring. Moreover, since the intake valve is not fixed by the frictional force of the O-ring, the user does not need to use a large amount of force to turn the knob or the trigger member compared to the conventional pneumatic machine tool.

Please refer to FIG. 3. FIG. 3 illustrates a pneumatic power tool according to a first embodiment of the present invention. The pneumatic power tool 20 has a gun-shaped housing 21, a drive shaft 22, and a trigger 23. A lock member (not shown) can be mounted on the front end of the drive shaft 22, and the lock member is a bolt or a nut. . In addition, the trigger 23 is used to illuminate an air intake device (not shown) installed inside the casing 21. When the trigger 23 is pressed, the drive shaft 22 starts to rotate. In addition, a knob 2611 is further disposed at the rear of the housing 21. When the knob 2611 is rotated clockwise by a predetermined angle, the drive shaft 22 rotates clockwise. Conversely, when the knob 2611 is rotated counterclockwise by a predetermined angle, the drive shaft 22 is rotated counterclockwise.

4A and FIG. 4B, FIG. 4A is an internal view of the pneumatic power tool of the first embodiment, and FIG. 4B is an exploded view of the cylinder, the impeller and the intake valve. The pneumatic power tool 20 further includes a cylinder 24, an impeller 27 and an intake valve 25, wherein the cylinder 24 is disposed inside the casing 21 and has a forward rotation air inlet 241 and a reverse air intake hole 242 (as shown in FIG. 4C). ). In addition, the intake valve 25 is disposed behind the cylinder 24, and the intake valve 25 is used to close or open the forward air inlet 241 or the reverse air inlet 242 of the cylinder 24 to adjust the drive shaft 22 (as shown in FIG. 3). ) The turn. The impeller 27 is provided with vanes 271 which are gaps 272 interposed in the impeller 27. When the high pressure gas enters from the forward rotation air inlet 241 or the reverse air inlet 242, it pushes the blade 271 and rotates the impeller 27, thereby rotating the drive shaft 22.

In addition, please refer to FIG. 4B and FIG. 4D simultaneously, and FIG. 4D illustrates an exploded view of the intake valve and the switching mechanism. The switching mechanism 26 (shown in FIG. 4A ) is disposed behind the intake valve 25 . The switching mechanism 26 includes an adjusting mechanism 261 , an elastic element 262 , and a fixing bolt 263 . The adjusting mechanism 261 includes a knob 2611 and a linking member 2613. The knob 2611 is disposed at the rear of the housing 21, and the linking member 2613 is disposed inside the housing 21. As shown in FIG. 4D, the adjusting mechanism 261 further includes two latches 2615. One end of the latch 2615 is inserted into the knob 2611, and the other end of the latch 2615 is inserted into the linking member 2613. Therefore, when the knob 2611 is rotated, the link member 2613 is also driven and rotated. In the present embodiment, the spring element 262 is a coil spring, but other types of spring elements are also available to those of ordinary skill in the art.

4B and 4D, the intake valve 25 includes a front cover 252 and a rear seat 254, wherein the front cover 252 is engaged with the rear seat 254. The intake valve 25 further includes two pins 253. One end of the pin 253 is inserted into the hole of the linking member 2613, and the other end of the pin 253 is inserted into the rear seat 254 of the intake valve 25. Therefore, when the linking member 2613 rotates, the rear seat 254 and the front cover 252 are also rotated. By the rotation of the front cover 252, the notch 2521 of the front cover 252 can be aligned with the forward rotation air inlet 241 of the cylinder 24 or the reverse air inlet hole 242 (as shown in FIG. 4C), when the notch 2521 is aligned with the forward rotation air inlet. At the time of the hole 241, the forward rotation air inlet 241 is opened, and the reverse air intake hole 242 is closed. When the forward rotation air inlet 241 is opened, the drive shaft 22 is rotated in the clockwise direction. Conversely, when the reverse intake port 242 is opened, the drive shaft 22 is rotated in the counterclockwise direction.

Please refer to FIG. 5A and FIG. 5B . FIG. 5A and FIG. 5B are perspective views of the adjustment mechanism. A sliding groove 2612 is disposed on the linking member 2613, and a latching groove 2614 is defined at each end of the sliding groove 2612. Wherein, one end of the fixing bolt 263 is inserted into the sliding groove 2612, and the other end of the fixing bolt 263 is fixed on the casing 21 (shown in FIG. 3). Further, one end of the elastic member 262 is pressed against the rear seat 254 of the intake valve 25, and the other end is pressed against the link member 2613. Next, referring to FIG. 5B, when the knob 2611 is rotated and the fixing bolt 263 is corresponding to the position of the card slot 2614, the elastic force applied by the elastic member 262 causes the adjustment mechanism 261 to be displaced backward, and the fixing bolt 263 and the card slot are fixed. 2614 phase engagement. Therefore, when the pneumatic power tool 20 is in operation, the intake valve 25 is fixed at a predetermined angle without deviation. In the present embodiment, the rear seat 254 is fixed by the snapping manner, so that the front cover 252 is maintained at a predetermined angle, so that the service life can be long, unlike the conventional O-ring 1621 (eg, Figure 2 shows a problem with wear. Moreover, since the rear seat 254 is not fixed by the frictional force, the user does not need to use a large amount of effort to turn the knob 2611 as compared with the conventional pneumatic power tool 10.

Please refer to FIG. 6A. FIG. 6A illustrates a pneumatic power tool according to a second embodiment of the present invention. In the present embodiment, the same or similar elements as those in FIG. 3 will be denoted by the same reference numerals and will not be described again. Compared to the pneumatic power tool 20 of FIG. 3, the pneumatic power tool 30 of the present embodiment controls the steering of the drive shaft 22 by means of a trigger member 3611 disposed above the housing 31.

Referring to FIG. 6B and FIG. 6C, FIG. 6B is an internal view of the pneumatic power tool of the second embodiment, and FIG. 6C is an exploded view of the intake valve and the switching mechanism of the second embodiment. The intake valve 35 includes a front cover 252 and a rear seat 354. The rear seat 354 is fixedly coupled to the front cover 252, and a blind hole 351 is defined in the rear seat 354. In addition, the switching mechanism 36 of the present embodiment includes an adjusting mechanism 361, a resilient member 362, and a fixing bolt 363. The adjusting mechanism 361 includes a triggering member 3611, a supporting collar 3613, and a connecting shaft 3615. The trigger member 3611 is disposed above the housing 31. The connecting shaft 3615 is inserted through the trigger member 3611 and the support collar 3613, and the trailing end thereof is inserted into the blind hole 351. Moreover, the support collar 3613 bears against the rear seat 354 and directly above the blind hole 351, and the elastic member 362 is sleeved on the support collar 3613. One end of the elastic member 362 is a chassis that presses against the support collar 3613, and the other end is pressed against the trigger member 3611, so that the elastic member 362 exerts an elastic force on the trigger member 3611.

Please refer to FIG. 6C, FIG. 7A, and FIG. 7B simultaneously. FIG. 7A and FIG. 7B are perspective views of the adjustment mechanism. The sliding member 3611 is provided with a sliding groove 3612, and two ends of the sliding groove 3612 are respectively provided with a locking groove 3614. One end of the fixing bolt 363 is inserted into the sliding groove 3612, and the other end of the fixing bolt 363 is fixed to the casing 31. Next, referring to FIG. 7B, when the trigger member 3611 is pulled and the fixing bolt 363 corresponds to the position of the card slot 3614, the elastic force exerted by the elastic member 362 causes the trigger member 3611 to move upward, and the fixing bolt is fixed. The 363 is engaged with the card slot 3614. Therefore, when the pneumatic power tool 30 is in operation, the intake valve 35 is fixed at a predetermined angle without deviation. In the present embodiment, the intake valve 35 is also prevented from being deviated by the engagement, so that the O-ring 1621 (shown in Fig. 2) is not worn as is conventional. Moreover, the user can easily pull the trigger member 3611 without spending a large amount of force.

In addition, in the above-mentioned embodiments, the housings of the pneumatic machine tool are all gun-shaped, but the housing of the pneumatic machine tool is not limited to a gun shape, and the switching mechanism of the above embodiment can also be applied to other forms of pneumatic tools. machine. Please refer to FIG. 8. FIG. 8 illustrates a pneumatic power tool according to a third embodiment of the present invention. The casing 41 of the pneumatic power tool 40 has a straight shape, and its internal components (including the switching mechanism 36) are similar to the second embodiment described above, and therefore will not be described again.

The present invention has been described above by way of examples, and is not intended to limit the scope of the claims. The scope of patent protection is subject to the scope of the patent application and its equivalent fields. Modifications or modifications made by those skilled in the art, without departing from the spirit or scope of the invention, are equivalent to the equivalents or modifications made in the spirit of the invention and should be included in the following claims. Inside.

<Prior technology>

10. . . Pneumatic machine tool

11. . . case

12. . . Drive shaft

13. . . trigger

14. . . Adjustment mechanism

141. . . Knob

142. . . Linkage

15. . . cylinder

16. . . Intake valve

161. . . The front cover

162. . . Rear seat

1621. . . O-ring

<Embodiment>

20. . . Pneumatic machine tool

twenty one. . . case

twenty two. . . Drive shaft

twenty three. . . trigger

twenty four. . . cylinder

241. . . Forward air intake

242. . . Reverse air intake

25. . . Intake valve

252. . . The front cover

2521. . . gap

253. . . plug

254. . . Rear seat

26. . . Switching mechanism

261. . . Adjustment mechanism

2611. . . Knob

2612. . . Sliding groove

2613. . . Linkage

2614. . . Card slot

2615. . . plug

262. . . Elastic component

263. . . Fixing bolt

27. . . impeller

271. . . blade

272. . . gap

30. . . Pneumatic machine tool

31. . . case

35. . . Intake valve

351. . . Blind hole

354. . . Rear seat

361. . . Adjustment mechanism

3611. . . Trigger

3612. . . Sliding groove

3613. . . Support collar

3614. . . Card slot

3615. . . Connecting shaft

362. . . Elastic component

363. . . Fixing bolt

40. . . Pneumatic machine tool

41. . . case

FIG. 1 illustrates a conventional pneumatic power tool.

Figure 2 depicts a partial component of a pneumatic machine tool.

FIG. 3 illustrates a pneumatic power tool according to a first embodiment of the present invention.

4A is an internal view of the pneumatic power tool of the first embodiment.

Figure 4B shows an exploded view of the cylinder, impeller and intake valve.

4C is a perspective view of the cylinder.

FIG. 4D is an exploded view of the intake valve and the switching mechanism.

5A and 5B are perspective views of the adjustment mechanism.

FIG. 6A illustrates a pneumatic power tool according to a second embodiment of the present invention.

Figure 6B shows an internal view of the pneumatic machine tool of the second embodiment.

6C is an exploded view of the intake valve and the switching mechanism of the second embodiment.

7A and 7B are perspective views of the adjustment mechanism.

FIG. 8 illustrates a pneumatic power tool according to a third embodiment of the present invention.

2611‧‧‧ knob

2612‧‧‧ sliding groove

2613‧‧‧ linkages

2614‧‧‧ card slot

263‧‧‧fixing bolt

Claims (8)

A pneumatic machine tool includes: a casing; a drive shaft; a cylinder disposed inside the casing, the cylinder having a forward rotation air inlet and a reverse air intake hole; an intake valve, the intake air a valve is disposed behind the cylinder, the intake valve is configured to close or open the forward air inlet or the reverse air inlet to adjust the steering of the driving shaft; and a switching mechanism, the switching mechanism is disposed at the air inlet After the valve, the switching mechanism includes an adjusting mechanism, an elastic component, and a fixing bolt. A part of the volume of the adjusting mechanism is exposed outside the casing, and a sliding groove is disposed on the adjusting mechanism, and the two ends of the sliding groove are respectively a spring slot is provided, the elastic element applies an elastic force to the adjusting mechanism, one end of the fixing bolt is fixed to the housing, and the other end of the fixing bolt extends into the sliding groove; wherein the adjusting mechanism and the adjusting mechanism The intake valve is connected, and when the adjusting mechanism is rotated by a predetermined angle, the position of the fixing bolt corresponds to the slot, and the elastic force applied by the elastic element to the adjusting mechanism causes the fixing bolt to enter and engage In the card slot. The pneumatic power tool of claim 1, wherein the intake valve has a blind hole, and the adjusting mechanism comprises: a triggering member, the triggering member is disposed above the housing, and the sliding a groove is disposed on one side of the trigger member, the elastic member applies an elastic force to the trigger member; and a connecting shaft, the connecting shaft extends through the trigger member, and one end of the connecting shaft is inserted therein In the blind hole; when the trigger member is pulled, the connecting shaft is driven to cause the connecting shaft to drive the intake valve, so that the intake valve can close or open the forward air inlet or the reverse Stomata. The pneumatic power tool of claim 2, wherein the intake valve comprises: a front cover, which can be closed or opened by rotating the front cover to adjust or open the forward air inlet or the reverse air inlet to adjust The steering of the pneumatic machine tool; and a rear seat, the rear seat is fixedly connected to the front cover, and the blind hole is disposed on the rear seat. The pneumatic power tool of claim 2, wherein the switching mechanism further comprises a support collar, the support collar being located directly above the blind hole and resting on the intake valve, The elastic element is sleeved on the support collar, and the connecting shaft extends through the support collar. The pneumatic power tool of claim 1, wherein the adjustment mechanism comprises: a knob disposed at a rear of the housing; and a linkage member disposed in the housing, the linkage member is Corresponding to the knob and the intake valve, and the sliding groove is disposed on the linking member, the elastic member applies an elastic force to the linking member; when the knob is rotated, the linking member is driven, thereby allowing The linkage drives the intake valve to close or open the forward intake port or the reverse intake port. The pneumatic power tool of claim 5, wherein the intake valve comprises: a front cover, which can be closed or opened by rotating the front cover to adjust or open the forward air inlet or the reverse air inlet to adjust Steering of the pneumatic power tool; and a rear seat fixedly coupled to the front cover, and the rear seat is fixedly coupled to the linkage. The pneumatic power tool of claim 6, wherein the intake valve further comprises a plurality of latches, one end of the latch is inserted on the linking member, and the other end of the latch is inserted in the On the back seat. The pneumatic machine tool of claim 5, wherein the adjusting mechanism further comprises a plurality of latches, one end of the latch is inserted on the knob, and the other end of the latch is inserted in the linkage With the latch, when the knob is rotated, the linkage will also rotate.