TWM481796U - Pneumatic tool - Google Patents

Description

Pneumatic tool

This creation is about a pneumatic tool, especially a pneumatic tool that combines light weight and air tightness.

The Taiwan M316787 patent discloses an air intake control structure of a pneumatic tool, the air motor group of which can form a positive and negative state by controlling the introduction direction of the high pressure gas.

In order to reduce the weight of the pneumatic tool, the M316787 patent uses a plastic outer casing. However, since the metal valve sleeve 14 cannot be accurately matched with the plastic outer casing to achieve airtightness, the valve sleeve 14 and the cylinder 15 are made of integrally formed metal. A control rod 30 is further disposed in the sleeve 14 to control the flow path of the high-pressure gas. However, the structural design is such that once the valve sleeve 14 is damaged, it must be replaced together with the cylinder 15, or once the cylinder 15 is damaged, it must be combined with the valve sleeve. 14 Replacement together, increasing the user's maintenance costs, and wasting more limited earth resources.

In addition, in the prior art, the design of the valve sleeve 14 and the cylinder 15 are made of metal, so that the pneumatic tool still has a considerable weight. If the valve sleeve 14 and the cylinder 15 are independently designed, the weight can be reduced, but the two are not easy to be used. It has good air tightness, which affects the output power of pneumatic tools. Therefore, how to overcome this problem is really considered by people in the field.

The main purpose of this creation is to provide a pneumatic tool that combines light weight and high output power. Another object of the present creation is to provide a pneumatic tool that reduces maintenance costs.

The present invention provides a pneumatic tool comprising a casing, a valve cover, a plurality of airtight rings and a control rod, wherein the casing has a pipe portion, the inner diameter of the pipe portion is gradually reduced in the axial direction thereof, and the circumference of the pipe portion is set a plurality of through holes, the valve sleeve has a shaft hole, and a protruding portion is disposed in the tube portion of the outer casing, the outer diameter of the extending portion is gradually reduced in the axial direction, and the extending portion has a plurality of perforations respectively corresponding to the Each of the through holes of the tube portion is disposed on the surface of the valve sleeve and abuts against the inner edge of the tube portion, and each of the perforations is located between the two airtight rings in the axial direction, and the control rod is Pass through the shaft hole of the valve sleeve.

With the above design, even if the outer casing is made of plastic, it can ensure good airtightness between the outer casing, the valve cover and the control rod, thereby achieving the purpose of achieving both weight reduction and high output power, and reducing the user. Maintenance costs.

10‧‧‧ Shell

11‧‧‧ Department of Management

111, 112, 113, 114, 115, 116, 117, 118‧‧‧ ring segments

12‧‧‧Air motor

13‧‧‧through hole

14‧‧‧ positioning slot

15‧‧‧Ontology

151‧‧‧

152‧‧‧ grip

16‧‧‧ front housing

17‧‧‧ Rear housing

20‧‧‧Valve sets

21‧‧‧Axis hole

221‧‧‧ front retaining ring

222, 223, 224, 225, 227, 228, 229, 230‧‧ ‧ outer annulus

226‧‧‧Back ring

22‧‧‧ into the paragraph

23‧‧‧Perforation

24‧‧‧ Positioning block

31, 32, 33, 34, 35‧ ‧ airtight ring

40‧‧‧Control lever

41‧‧‧ Ring groove

42‧‧‧elastic ring

Figure 1 is a perspective view of a first embodiment of the present creation.

Fig. 2 is an exploded view of the first embodiment of the present creation.

Figure 3 is a right side partial cross-sectional view of the first embodiment of the present creation.

Figure 4 is a left side partial cross-sectional view of the first embodiment of the present creation.

Fig. 5 is an enlarged plan view showing a right side view of the first embodiment of the present invention. Fig. 6 is an enlarged plan view showing a right side view of the second embodiment of the present invention.

Please refer to Figures 1 and 2. This creation provides a pneumatic tool such as pneumatic a wrench or a pneumatic screwdriver comprising a casing 10, a valve cover 20, a plurality of airtight rings 31, 32, 33, 34, 35 and a control rod 40, and the pneumatic tool usually further comprises a pneumatic motor 12, an impact group 121 and An output shaft 122 is disposed in front of the impact group 121. However, the air motor 12, the impact group 121 and the output shaft 122 are conventional components, and thus will not be further described herein.

Please refer to Figures 1 to 5 for further details. The outer casing 10 has a tube portion 11 and a pneumatic motor 12 above the tube portion 11, wherein the tube portion 11 is for accommodating the valve sleeve 20. The inner diameter of the tube portion 11 is gradually reduced in the axial direction thereof, and a plurality of through holes 13 are formed in the periphery of the tube portion 11. The through hole 13 functions to guide the air flow to each predetermined flow path, but the design of the flow path is also known. Not the characteristics of this creation. The inner edge of the pipe portion 11 has a plurality of ring segments 111, 112, 113, 114 in the axial direction, and the inner diameter of the ring segment located at the front is larger than the inner diameter of the ring segment located at the rear, that is, the inner diameter of the pipe portion 11. In the axial direction, the diameter of the ring segment 111 is gradually larger than that of the ring segment 112. The inner diameter of the ring segment 112 is larger than the ring segment 113, and the inner diameter of the ring segment 113 is larger than the ring segment 114, and each ring segment 111-114 There is one of the through holes 13. The front in this paper refers to the direction indicated by the output shaft 122 of the pneumatic tool, and the rear is the opposite direction of the front.

The valve sleeve 20 has a shaft hole 21, and an extending portion 22 is disposed in the tube portion 11. The outer diameter of the extending portion 11 is gradually reduced in the axial direction, and the extending portion 22 has a plurality of perforations 23 respectively corresponding to The through holes 13 of the tube portion 11, that is, the wearing The holes 23 are respectively communicated with the through holes 13, and the holes 23 are communicated with the shaft holes 21. The extending section 22 has a front retaining ring 221, and a plurality of outer annular faces 222, 223, 224, 225 are sequentially arranged from the front retaining ring 221, and the outer diameter of the front retaining ring 221 is larger than the outer annular faces 222- 225, the front retaining ring 221 is located in the ring segment 111 at the forefront of the tube portion 11, the outer diameter of the outer ring surface at the front is larger than the outer diameter of the outer ring surface at the rear, that is, the outer diameter of the extending portion 22 is After the travel, the outer ring surface 222 has an outer diameter larger than the outer ring surface 223, and the outer ring surface 223 has an outer diameter larger than the outer ring surface 224, and the outer ring surface 224 has an outer diameter larger than the outer ring surface 225, and each The outer ring surface 224 is provided with one of the perforations 23.

The airtight rings 31-35 are disposed on the surface of the valve cover 20 and are attached to At the inner edge of the tube portion 11, each of the through holes 23 is located between the two airtight rings 31-35 in the axial direction. The airtight ring 35 at the rear end is attached to the tail end of the valve sleeve 20 and is sleeved on the outer edge of the control rod 40. The airtight ring 31 located at the forefront is a front retaining ring that is sleeved on the valve cover 20. 221, the remaining partial airtight rings 32-34 are respectively sleeved on a part of the outer annular surface 222, 223, 225 of the valve sleeve 20, and the annular end of the valve sleeve 20 has an axially recessed annular groove for the airtight ring 35 to be accommodated. The front retaining ring 221 and the outer annular faces 222, 223, 225 have radially recessed annular grooves for the airtight rings 31-34.

The control rod 40 is a shaft hole 21 that is disposed through the valve sleeve 20, and the control rod 40 It is used to control the flow path of the high pressure gas to realize the positive, reverse and/or rotational speed control of the air motor. Therefore, the control rod 40 has a plurality of grooves and holes and is selectively communicated between the through holes 23.

With the above design, the through hole 13 and the through hole 23 can be kept in communication without leaking, so that the high pressure gas can flow in the predetermined passage, even if The outer casing 10 and the tube portion 11 are made of a plastic material, and the tube portion 11 and the valve sleeve 20 are also excellent in airtightness, so that the high output power and weight reduction requirements of the pneumatic tool can be satisfied at the same time, and When the valve sleeve 20 is damaged, it is not necessary to replace the air motor 12 together, and only a single component of the valve sleeve 20 needs to be replaced, which not only reduces the maintenance cost of the user, but also reduces the waste of the earth resources.

In order to prevent the valve sleeve 20 from rotating in the outer casing 10, the outer casing 10 can be made The interior has at least one (two in this embodiment) positioning slots 14, and the valve sleeve 20 has at least one (two in this embodiment) positioning blocks 24 embedded in the positioning slots 14. However, the manner in which the valve sleeve 20 is prevented from rotating relative to the outer casing 10 is not limited thereto. For example, the non-circular joint between the valve sleeve 20 and the outer casing 10 can also be realized.

The lever 40 can be designed to be axially displaceable in the shaft hole 21, and The control rod 40 can be positioned at different axial positions. The control rod 40 can have a two-ring groove 41 in front of the valve sleeve 20, and an elastic ring 42 can be selectively sleeved in one of the two ring grooves 41. The elastic ring 42 abuts against the front end of the valve sleeve 20, in other words, as the axial position of the control rod 40 is different, the elastic ring 42 is selectively embedded in one of the annular grooves 41 to position the control rod 40, but the elastic ring The axial relative position of the 42 and the valve sleeve 20 does not change.

In order to facilitate the assembly of the components, the outer casing 10 can be divided into a plurality of main For example, the outer casing 10 can have a body 15, a front casing 16 and a rear casing 17, the body 15 having a barrel 151 and a grip 152 extending downward from the barrel 151. The front shell The body 16 is disposed at a front end of the barrel 151, and the rear housing 17 is disposed at a rear end of the barrel 151, and the barrel 151 has the tube portion 11 extending in the axial direction of the barrel 151. Of course However, the assembled structure of the outer casing 10 is not limited thereto.

In the foregoing embodiment, the inner diameter of the tube portion 11 and the extension of the valve sleeve 20 The segment 22 is gradually reduced in the axial direction from the front to the rear, but in other possible embodiments, the inner diameter of the tubular portion and the extended portion may also be gradually reduced in the axial direction from the rear to the front. For example, in the embodiment shown in Fig. 6, the tube portion 11 also has a plurality of ring segments 115, 116, 117, 118, the inner diameter of the ring segment at the front is smaller than the inner diameter of the ring segment at the rear, and thus the ring segment 115 has an inner diameter smaller than the ring segment 116, the inner diameter of the ring segment 116 is smaller than the ring segment 117, and the inner diameter of the ring segment 117 is smaller than the ring segment 118. Each ring segment 115-118 also has one of the through holes 13 and extends into the segment 22 There is a rear retaining ring 226, and a plurality of outer annular surfaces 227, 228, 229, 230 are arranged in sequence from the rear retaining ring 226. The outer diameter of the rear retaining ring 226 is larger than the outer annular surfaces 227-230, the rear gear The ring 226 is located in the last ring segment 118 of the tube portion 11, and the airtight ring 35 at the rear is attached to the rear ring 226, and the airtight ring 31 at the forefront is attached to the valve sleeve. The front end of the 20 is sleeved on the outer edge of the control rod 40. In addition, the outer diameter of the outer annular surface located at the front is smaller than the outer diameter of the outer annular surface located at the rear, so that the outer diameter of the outer annular surface 227 is larger than the outer annular surface 228, and the outer diameter of the outer annular surface 228 is larger than the outer annular surface 229, and the outer ring The outer diameter of the face 229 is again greater than the outer annulus 230, and each outer annulus 227-230 has a perforation. In the present embodiment, the remaining components of the pneumatic tool are substantially the same as in the previous embodiment. Based on the above-mentioned changes, it is possible to achieve both the airtightness of the pneumatic tool, the high output power and the light weight, and also reduce the maintenance cost of the user.

Finally, it must be stated that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention. Alternatives or variations of other equivalent elements should also be applied for in this case. Covered by the scope.

10‧‧‧ Shell

11‧‧‧ Department of Management

12‧‧‧Air motor

14‧‧‧ positioning slot

15‧‧‧Ontology

151‧‧‧

152‧‧‧ grip

16‧‧‧ front housing

17‧‧‧ Rear housing

20‧‧‧Valve sets

21‧‧‧Axis hole

221‧‧‧ front retaining ring

222, 223, 224, 225‧‧ ‧ outer annulus

22‧‧‧ into the paragraph

23‧‧‧Perforation

24‧‧‧ Positioning block

31, 32, 33, 34, 35‧ ‧ airtight ring

40‧‧‧Control lever

41‧‧‧ Ring groove

42‧‧‧elastic ring

Claims (11)

A pneumatic tool comprising: a casing having a tubular portion therein, an inner diameter of the tubular portion gradually decreasing in an axial direction thereof, a plurality of through holes at a periphery of the tubular portion; a valve sleeve having a shaft hole and a stretch The inlet portion is disposed in the tube portion of the outer casing, and the outer diameter of the extending portion is gradually reduced in the axial direction, and the extending portion has a plurality of perforations respectively corresponding to the through holes of the tube portion; a plurality of airtight rings are disposed at the The surface of the valve sleeve is attached to the inner edge of the tube portion, each of the perforations is located between the two airtight rings in the axial direction; and a control rod is disposed through the shaft hole of the valve sleeve. The pneumatic tool according to claim 1, wherein the inner edge of the tube portion of the outer casing has a plurality of ring segments in the axial direction, and the inner diameter of the front ring segment is larger than the inner diameter of the rear ring segment, and each ring segment has a The through hole, the extending portion of the valve sleeve has a front retaining ring, and a plurality of outer annular surfaces are sequentially arranged from the front retaining ring to the rear, and the outer retaining ring is larger than the outer annular surface, and is located in front of the outer ring The outer ring of the torus is larger than the outer ring surface of the rear outer ring, and the front retaining ring is located in the ring segment at the forefront of the pipe portion, and each outer ring surface is provided with one of the perforations. The pneumatic tool according to claim 1, wherein the inner edge of the tube portion of the outer casing has a plurality of ring segments in the axial direction, and the inner diameter of the front ring segment is smaller than the inner diameter of the rear ring segment, and each ring segment has a The through hole, the extending portion of the valve sleeve has a rear retaining ring, and a plurality of outer annular surfaces are arranged in sequence from the rear retaining ring, and the outer ring of the rear retaining ring is larger than the outer annular surface, and is located in front of the outer ring Outside the torus, less than the outer ring surface In addition, the rear retaining ring is located in the ring segment of the last side of the pipe portion, and each of the outer ring faces is provided with the perforation. The pneumatic tool of any one of claims 1 to 3, wherein the outer casing has at least one positioning groove therein, and the valve sleeve has at least one positioning block embedded in the positioning groove. The pneumatic tool according to any one of claims 1 to 3, wherein the control rod has a two-ring groove located in front of the valve sleeve, and an elastic ring is sleeved on one of the two ring grooves, and the elastic ring is attached. Arrive at the front end of the valve sleeve. The pneumatic tool according to any one of claims 1 to 3, wherein the outer casing has a body, a front casing and a rear casing, the body has a barrel body, and a grip is downwardly from the barrel body Extendingly, the front housing is disposed at a front end of the barrel, and the rear housing is disposed at a rear end of the barrel, the barrel having the tube portion extending along an axial direction of the barrel. The pneumatic tool of claim 1 or 2, wherein the airtight ring at the rear end is attached to the trailing end of the valve sleeve and sleeved on the outer edge of the control rod. The pneumatic tool of claim 1 or 3, wherein the airtight ring located at the forefront is attached to the front end of the valve sleeve and sleeved on the outer edge of the control rod. The pneumatic tool of claim 2 or 3, wherein a part of the airtight ring is sleeved on a part of the outer annular surface of the valve sleeve. The pneumatic tool of claim 2, wherein the airtight ring system located at the forefront is sleeved on the front retaining ring of the valve sleeve. The pneumatic tool of claim 3, wherein the airtight ring system located at the rear end is sleeved on the rear retaining ring of the valve cover.