TWM569274U - Pneumatic tool - Google Patents

Abstract

A pneumatic tool includes an outer casing and an output mechanism mounted inside the outer casing, the output mechanism having a cylinder unit having a cylinder chamber, and a forward passage and a reverse passage communicating with the cylinder chamber The pneumatic tool further includes a reversing mechanism for selectively introducing a gas into the forward passage and the reverse passage, and a regulating portion for assisting a portion of the gas to be discharged from the forward passage when the pneumatic tool is in a reverse mode Gas mechanism. The cooperation of the foregoing structure can accelerate the discharge of gas which would generate back pressure in the cylinder chamber when the pneumatic tool is in the reverse mode, thereby improving the lack of torque in the conventional pneumatic tool during reversal.

Description

Pneumatic tool

The present invention relates to a portable impact tool, and more particularly to a pneumatic tool that uses gas to come in and out and rotate the animal piece forward and reverse.

The conventional pneumatic tool basically comprises an outer casing, an output mechanism mounted inside the outer casing, and an intake and exhaust mechanism for controlling gas in and out of the output mechanism, the output mechanism comprising a cylinder unit having a cylinder chamber, and a a rotor eccentrically disposed inside the cylinder chamber, and an impact unit having an output shaft that can be driven to rotate forward and reverse, and the intake and exhaust mechanism controls the amount of intake air entering and exiting the cylinder chamber And the direction, the purpose of controlling the speed and the direction of rotation of the output shaft can be achieved.

Conventional pneumatic tools can drive the output shaft to rotate forward and reverse, and to rotate objects such as screws, etc., by the cooperation of the members. However, under normal use conditions, the pneumatic tool is relatively easy to drive the screw forward and screwed onto a workpiece, but when the screw is mounted on the workpiece for a period of time, it is easily caught by rust and dust. On the workpiece, at this time, it is relatively difficult to reverse and loosen the screw by using the pneumatic workpiece.

In addition to the problems from the screw itself, the aforementioned structure of the pneumatic tool is also a factor of influence. That is, although the conventional pneumatic tool can drive the output shaft to reverse, when the gas enters the cylinder chamber, most of the gas can be discharged from the plurality of vent holes of the cylinder unit, but part of the gas passes over the vent holes. The back pressure is formed in the cylinder chamber, which causes the rotor to continue to rotate smoothly at a high speed, and thus the output torque is degraded.

It is an object of the present invention to provide a pneumatic tool that can ameliorate at least one of the disadvantages of the prior art.

The pneumatic tool of the present invention comprises a housing defining an assembly space, an output mechanism mounted in the assembly space, a reversing mechanism, and a damper mechanism including a cylinder unit defining a cylinder chamber And a rotor rotatably mounted in the cylinder chamber, the cylinder unit having a forward passage that introduces gas into the cylinder chamber to drive the rotor to rotate forward, and a reversal that introduces gas into the cylinder chamber to drive the rotor to reverse a passage, and an exhaust passage having an assembly section in communication with the forward passage, and an exhaust section communicating with the assembly space and the assembly section, the reversing mechanism being mounted on the outer casing, and Optionally introducing a gas into the forward rotation passage and the reverse passage, the air regulation mechanism including a tempering control rotatably mounted on the assembly section of the exhaust passage, the tempering control having a communicationable The exhaust section and the air passage of the forward passage.

When the pneumatic tool is in a reverse mode and the air conditioning passage of the air conditioning mechanism communicates with the forward passage and the exhaust section, gas will enter the cylinder chamber from the reverse passage, and a portion of the gas located in the cylinder chamber will be The forward rotation passage is discharged through the air passage.

The utility model has the following effects: the gas regulating mechanism can accelerate the discharge of gas which is generated in the cylinder chamber to generate back pressure when the pneumatic tool is located in the reverse mode, so as to improve the lack of torque in the reverse of the conventional pneumatic tool. At the same time, the torque can be adjusted without any adjustment when the pneumatic tool is rotating forward to meet a wide range of needs.

Referring to Figures 1, 2, and 3, an embodiment of the present pneumatic tool includes a housing 1 and an output mechanism 2, a reversing mechanism 3, and a damper mechanism 4 mounted to the housing 1. The outer casing 1 includes a rear casing 11 for gripping, and a front casing 12 that is anteriorly coupled to the rear casing 11, the rear casing 11 cooperating with the front casing 12 to define a lateral assembly The space 10, the rear housing 11 defines an air inlet 110 communicating with the assembly space 10, and the rear housing 11 has a rear end wall 111 having a front and rear through and a left and right A through hole 112 and a second through hole 113.

The output mechanism 2 includes a cylinder unit 20 adjacent to the rear end wall 111, a rotor 21 that is eccentrically rotatable and erectable inside the cylinder unit 20, and an impact unit 22 that can be driven to rotate forward and reverse by the rotor 21. The impact unit 22 has an output shaft 221 that horizontally protrudes from the front housing 12. In the present embodiment, the cylinder unit 20 is formed by a cylinder block 201 and a rear bearing block 202 which are butt-joined back and forth, and are fixedly coupled by a plurality of screws, but are not limited to the foregoing examples in manufacturing.

After being combined, the cylinder unit 20 has substantially a front mounting wall 23, a rear mounting wall 24 spaced from the front mounting wall 23, and a master cylinder connected between the front mounting wall 23 and the rear mounting wall 24. The wall 25, which cooperates to define a cylinder chamber 26 for accommodating the rotor 21, has a front frame wall 231 having a front peripheral wall 231 having an inner peripheral surface adjacent the rear housing 11. a surrounding surface 241, a rear frame hole 242 axially corresponding to the front frame hole 231, a first end surface 243 facing the cylinder chamber 26, a second end surface 244 spaced parallel to the first end surface 243, and a An exhaust passage 245 having an assembly section 246 extending through the first end surface 243 and the second end surface 244, and an exhaust section 247 connecting the surrounding surface 241 and the assembly section 246, ie, assembled The exhaust section 247 communicates with the assembly section 246 and the assembly space 10.

The master cylinder wall 25 surrounds the cylinder chamber 26 and has a plurality of exhaust holes 251 communicating with the cylinder chamber 26 and the assembly space 10, and a forward passage 252 for introducing a gas into the cylinder chamber 26, and a reverse passage 253. . The forward rotation passage 252 has a forward rotation guide groove 254 extending forward and backward and surrounding the cylinder chamber 26, two forward rotation through holes 255 communicating with the forward rotation guide groove 254 and the cylinder chamber 26, and one toward the intake air. The forward direction of the passage 110 and the forward rotation guide groove 254 is the same as that of the forward rotation passage 252, and is symmetrically located on the opposite side of the cylinder chamber 26, and has a reverse guide groove 257, Two reverse through holes 258 communicating with the reverse guide groove 257 and the cylinder chamber 26, and a reverse air inlet port 259 facing the intake passage 110 and communicating with the reverse rotation guide groove 257.

The reversing mechanism 3 includes a reversing valve 31 rotatably mounted in the intake passage 110, and a forward rotation control 32 for driving the reversing valve 31 to rotate forward or reverse, and a reversing control 33, the reversing control The valve 31 has a connecting passage 311 for allowing outside air to enter, and a engaging portion 312 surrounding the engaging passage 311. The engaging passage 311 has an optional connection with the forward-in port 256 and the reverse-in port 259. The forward control 32 has a control portion 321 that is laterally displaceably mounted in the first through hole 112, and a lever portion 322 that engages with the engaging portion 312 of the reversing valve 31. The reversing control 33 has the same configuration as the forward rotation control 32, and therefore has a manipulation portion 331 which is laterally displaceably mounted in the second perforation 113, and a lever engageable with the engagement portion 312. Part 332.

Referring to Figures 2, 3 and 4, the air conditioning mechanism 4 includes a tempering control 41, and a control button 42 projecting from the rear end wall 111 of the outer casing 1 and coupled with the damper control 41. The gas control 41 defines an L-shaped venting passage 410 having a conditioned inlet 411 communicating with the forward directional groove 254 and a venting gas corresponding to and offset from the venting section 247. Exit 412.

Referring to Figures 4, 5 and 6, the pneumatic tool of the present embodiment can be switched between a forward rotation mode and a reverse rotation mode according to the needs of use. When the pneumatic tool is in the reverse rotation mode, the reversing mechanism 3 will The position is in a reverse position shown in Fig. 6, and the damper mechanism 4 can be switched to an exhaust position shown in Fig. 4. At this time, by control, the external gas will enter the connecting passage 311, and then enter the reverse guiding groove 257 along the reverse inlet port 259, and finally enter the cylinder chamber 26 from the reverse through holes 258 to drive the rotor 21. reverse.

Referring to Figures 4, 5 and 7, most of the gas entering the cylinder chamber 26 is discharged from the exhaust holes 251, and a small portion of the gas passing through the exhaust holes 251 passes through the positive through holes 255. Entering the positive transfer channel 254, since the air conditioning outlet 412 of the air conditioning mechanism 4 is in communication with the exhaust section 247 of the cylinder unit 20, the gas entering the forward rotation guide groove 254 will pass through the air conditioning channel. 410 discharge. That is, when the pneumatic tool is in the reverse mode, and the gas regulating mechanism 4 is in the exhaust position, the gas that is back pressure formed in the cylinder chamber 26 may be accumulated, which can be quickly adopted by the gas regulating mechanism 4 The discharge prevents the rotor 21 from rotating due to the back pressure when rotating, resulting in a loss of torque.

Referring to Figures 5, 7, and 8, when the pneumatic tool is to be switched from the reverse mode to the forward mode, the forward rotation control 32 is pushed forward, the steering valve 31 is pushed to rotate by an angle, and the change is made. The interface 313 of the engagement passage 311 to the valve 32 corresponds to the forward-in port 256 of the cylinder unit 20. As shown in FIG. 7, when the pneumatic tool is in the forward rotation mode and the air conditioning mechanism 4 is in the exhausting position, the gas enters the air inlet 110, and the normal rotation channel can be accessed through the connecting passage 311. In the positive transducing channel 254 of the 252, part of the gas will enter the cylinder chamber 26 from the positive through hole 255 to drive the rotor 21 to rotate forward, and part of the gas flows to the tempering control 41. The gas passage 410 is finally discharged by the exhaust section 247. In other words, when the air conditioning mechanism 4 is located at the exhaust position, since a part of the gas is discharged, the amount of gas acting on the rotor 21 is relatively small.

Referring to Figures 2, 5 and 7, when the user rotates the air-conditioning control 41 by the control button 42, the corresponding area between the air-conditioning outlet 412 and the exhaust section 247 will be changed. The smaller the area, the smaller the amount of gas discharged, that is, the greater the amount of gas entering the cylinder chamber 26, so that the rotor 21 can be driven to accelerate the rotation. When the venting outlet 412 is completely offset from the venting section 247 of the exhaust passage 245, the gas entering the forward directional guide 254 will all enter the cylinder chamber 26 and push the rotor 21 forward at full speed. That is, the air conditioning mechanism 4 can adjust the rotational speed of the rotor 21 during forward rotation when the pneumatic tool is in the forward rotation mode. In other words, when the control button 42 is rotated in the clockwise direction of FIG. 2, the corresponding area of the air outlet 412 and the exhaust section 247 will become smaller and smaller, when the knob 42 is rotated clockwise to the maximum angle. At this time, the venting outlet 412 is completely offset from the venting section 247, at which time the gas will not be discharged by the venting section 247.

Specifically, the air conditioning mechanism 4 is biased on one side of the outer casing 1 and communicates with the forward rotation passage 252. Therefore, when the pneumatic tool is located in the forward rotation mode, the embodiment can be borrowed. By rotating the air conditioning mechanism 4, part of the gas is discharged in advance, that is, an appropriate amount of gas is introduced into the cylinder chamber 26 to prevent excess gas from working inside the cylinder chamber 26. When the pneumatic tool is in the reverse mode, by adjusting the air conditioning mechanism 4, the gas that has completed the rotation of the rotor 21 can be quickly discharged to the cylinder chamber 26, thereby preventing the gas volume from being generated in the cylinder chamber 26. Back pressure.

It can be seen from the above description that the speed governing mechanism 4 of the present invention can generate the effect of adjusting the rotational speed of the rotor 21 without a step, in addition to the pneumatic tool being in the forward rotation mode, when the pneumatic tool is switched to the reverse mode, the air conditioning is performed. The mechanism 4 also has the effect of accelerating the gas after the discharge, thereby solving the problem that the conventional pneumatic tool may have insufficient torque due to back pressure during the reverse rotation. Therefore, in addition to the novel structure, the pneumatic tool of the present invention also has industrial utilization value.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

1‧‧‧Shell

10‧‧‧Assembly space

11‧‧‧ Rear housing

110‧‧‧ Inlet

111‧‧‧ rear end wall

112‧‧‧First perforation

113‧‧‧Second perforation

12‧‧‧ front housing

2‧‧‧Output agency

20‧‧‧Cylinder unit

201‧‧‧Cylinder seat

202‧‧‧ rear bearing housing

21‧‧‧Rotor

22‧‧‧ impact unit

221‧‧‧ Output shaft

23‧‧‧Front wall

231‧‧‧Front hole

24 ‧ ‧ erection wall

241‧‧‧ Around the surface

242‧‧‧ Rear frame hole

243‧‧‧ first end face

244‧‧‧second end face

245‧‧‧Exhaust passage

246‧‧‧ Assembly section

247‧‧‧Exhaust section

25‧‧‧Master cylinder wall

251‧‧‧ venting holes

252‧‧‧ Forwarding channel

253‧‧‧Reversal channel

254‧‧‧正转槽

255‧‧‧turning through hole

256‧‧‧turned into the gas port

257‧‧‧Reverse guide channel

258‧‧‧Reverse through hole

259‧‧‧Reversing the air inlet

26‧‧‧Cylinder room

3‧‧‧Reversing agency

31‧‧‧Reversing valve

311‧‧‧Connected channel

312‧‧‧ teeth

313‧‧‧ Interface

32‧‧‧ Forward control

321‧‧‧Control Department

322‧‧‧Clamps

33‧‧‧Reverse control

331‧‧‧Control Department

332‧‧‧Clamp parts

4‧‧‧ gas regulating mechanism

41‧‧‧Ventilation control

410‧‧‧ air conditioning channel

411‧‧‧ gas inlet

412‧‧‧ Ventilation outlet

42‧‧‧ controls

BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the present invention will be apparent from the embodiments of the drawings, wherein: Figure 1 is a longitudinal sectional partial cross-sectional view of one embodiment of the present pneumatic tool; Figure 2 is a 3 is an exploded perspective view showing the relative relationship between a cylinder unit, a reversing mechanism and a gas regulating mechanism of the pneumatic tool; FIG. 4 is a 4-4 along FIG. 1 is a cross-sectional view of the embodiment; FIG. 5 is an incomplete transverse cross-sectional view of the embodiment; FIG. 6 is a top plan view of the embodiment, mainly illustrating the case where the reversing mechanism is in a reverse position; An incomplete combined cross-sectional view of the embodiment primarily illustrates the plenum mechanism; and Figure 8 is a view similar to Figure 6, with the reversing mechanism in a forward position.

Claims (8)

A pneumatic tool comprising: a housing defining an assembly space; an output mechanism mounted in the assembly space and including a cylinder unit defining a cylinder chamber, and a rotor rotatably mounted within the cylinder chamber The cylinder unit has a forward passage that introduces a gas into the cylinder chamber to drive the rotor to rotate forward, a reverse passage that introduces gas into the cylinder chamber to drive the rotor to reverse, and an exhaust passage having An assembly section in communication with the forward passage, and an exhaust section communicating the assembly space and the assembly section; a reversing mechanism mounted on the housing to selectively introduce a gas into the forward passage and the reversing And a gas regulating mechanism comprising a ventilating control rotatably mounted on the assembly section of the exhaust passage, the tempering control having a venting passage communicating with the exhaust section and the forward passage When the pneumatic tool is in a reverse mode, and the air conditioning passage of the air conditioning mechanism is connected to the forward rotation passage and the exhaust section The reversing passage by the gas enters the cylinder chamber, located in the cylinder chamber via a further portion of the gas passage to the forward passage of the exhaust gas transfer. The pneumatic tool of claim 1, wherein the venting passage has a venting inlet in communication with the forward passage, and a venting outlet corresponding to the venting section of the exhaust passage; When the gas control is rotated, the corresponding area between the ventilating outlet and the venting section is changed. The pneumatic tool of claim 2, wherein the damper mechanism further comprises a control button protruding from the outer casing and driving the damper control to rotate. The pneumatic tool of claim 2, wherein the outer casing comprises a rear casing, and a front casing that interfaces with the rear casing and collectively defines the assembly space, the rear casing having an assembly space a communicating inlet passage, the forward rotation passage of the cylinder unit has a forward rotation guide groove surrounding the cylinder chamber, at least one forward rotation through hole communicating with the forward rotation guide groove and the cylinder chamber, and a forward rotation inlet port The reverse passage has a reverse guide groove surrounding the cylinder chamber, at least one reverse through hole communicating with the reverse guide groove and the cylinder chamber, and a reverse inlet port; the reversing mechanism includes a front mounted on the outer casing a reversing valve in the air passage, and a forward rotation control and a reversing control capable of driving the reversing valve, the reversing valve having a connecting passage for allowing outside air to enter, the connecting passage having an optional Forward to the air port and the corresponding interface of the reverse air inlet. The pneumatic tool of claim 4, wherein the reversing valve further has a latching portion, and the forward rotation control and the reversing control each have a control portion protruding from the outer casing, and a reversing valve The lever portion of the engaging portion of the engaging portion. The pneumatic tool of claim 4, wherein the cylinder unit has a front mounting wall, a rear mounting wall spaced from the front mounting wall and having the exhaust passage, and a connection to the front mounting wall and the rear The main cylinder wall between the erecting walls and having the forward rotation passage and the reverse passage, the main cylinder wall further having at least one vent hole for discharging the gas inside the cylinder chamber. The pneumatic tool of claim 6, wherein the rear mounting wall has a first end surface, a second end surface spaced back and forth from the first end surface, and a connection between the first end surface and the second end surface Surrounding the surface; the assembly section of the exhaust passage extends through the first end surface and the second end surface and communicates with the forward rotation guide groove, and the exhaust section of the exhaust passage communicates with the surrounding surface and the assembly section. The pneumatic tool of any one of claims 1 to 7, wherein the output mechanism further comprises an impact unit driven to rotate by the rotor, the impact unit having an output shaft projecting from the outer casing.