TWI630993B - Pneumatic tool - Google Patents

Abstract

A pneumatic tool has a hollow body, and a pneumatic motor is connected to one end of the body. The air motor has a transmission shaft extending into the body, and the other end of the body is provided with a connecting member axially slidable, and the connecting member is A connecting portion is formed at one end of the body, and a cutter assembly portion is formed at the other end of the connecting member, and a rotatable driving gear is disposed in the body, the driving gear and the transmission shaft are meshed with each other, and the driving gear is offset from the axial center thereof. The position is provided with a protruding post, and a connecting rod has a first end and an opposite second end, and the connecting rod is pivotally connected to the protruding post by the first end thereof, and is pivotally connected to the connecting end by the second end thereof. The link of the piece.

Description

Pneumatic tool

The present invention relates to automated hand tools, and more particularly to a pneumatic tool that can drive a tool to reciprocate.

As shown in Figures 7 and 8, the conventional pneumatic saw drive structure is mainly provided with a drive gear 92 inside the pneumatic saw 91, and an eccentric post 93 is disposed on the drive gear 92, and a saw blade unit 94 is A transmission block 95 is fixed to the end, and the transmission block 95 has a long slot 951, and the eccentric post 93 is slidably abutted in the long slot 951. When the driving gear 92 rotates, the eccentric post 93 can push the transmission block 95 along the long groove 951 to move, so that the saw blade unit 94 can reciprocate in a linear casing.

However, the eccentric post 93 reciprocates along the long groove 951 to push the transmission block 95. Since the long groove 951 must have a sliding space for the eccentric post 93 to slide, the eccentric post 93 and the long groove 951 There is a gap 96 between them, that is, the saw blade unit 94 connected by such a transmission mode, the transmission block 95 and the boss 93 at the end of the saw blade unit 94 are actually non-fixable Since the saw blade unit 94 reciprocates at a high speed, the phenomenon of swaying is likely to occur, and the member is easily worn and noise is generated.

In view of this, how to improve the lack of the conventional pneumatic saw transmission structure is the primary problem to be solved by the present invention.

The main object of the present invention is to provide a pneumatic tool which has the advantages of simple structure and reliable transmission.

For the purpose of the foregoing, the present invention provides a pneumatic tool comprising: a body having a hollow shape and having a chamber, and one end of the body is terminated with a pneumatic motor, the air motor having a cavity extending into the chamber a drive shaft, and a drive tooth portion is disposed on the drive shaft, and the other end of the body is provided with an axially slidable connecting member, and the connecting member forms a joint portion toward one end of the chamber, and The connecting member is formed at a further distance from the other end of the chamber to form a cutter assembly portion; a drive gear is rotatably disposed in the chamber, the drive gear has a helical tooth portion, the helical tooth portion and the transmission tooth The first portion of the connecting rod is pivotally connected to the first end of the connecting rod and the opposite end of the connecting rod. The second end of the connecting rod is pivotally connected to the connecting portion of the connecting member.

Preferably, the tool assembly portion is formed by an engaging block that is inserted into the other end of the connecting member, and a slot for the clamping tool is formed on the engaging block.

Preferably, the body is fixed with a hollow tubular sleeve in the other end, and the connecting member is disposed in the sleeve, and two circumferentially disposed convex ring portions are formed on the outer circumference of the connecting member, and the connecting member is The two convex ring portions abut against the inner wall of the sleeve.

Preferably, the first end of the connecting rod defines a first through hole, and a first sliding member formed by a ball bearing is disposed in the first through hole. The first sliding member has a hollow annular shape and has a first outer wall and a first inner wall, the outer peripheral shape of the first outer wall corresponds to the inner edge shape of the first perforation, the first outer wall of the first sliding member abuts against the inner edge of the first perforation, and the shape of the first inner wall Rod with stud Corresponding to the shape of the body, the stud is disposed with the shaft and correspondingly abuts against the first inner wall of the first sliding member, and the second end of the connecting rod defines a second perforation, and a second perforation is provided therein. a second sliding member composed of a ball bearing, the second sliding member has a hollow outer ring shape and has a second outer wall and a second inner wall, and the outer peripheral shape of the second outer wall corresponds to the inner edge shape of the second perforation, and the second The second outer wall of the sliding member abuts against the inner edge of the second perforation, and the shape of the second inner wall corresponds to the shape of the shaft of the positioning post, and the positioning post passes through the connecting portion and the connecting body simultaneously with the shaft The second through hole of the rod is correspondingly abutted against the second inner wall of the second sliding member by the shaft.

Further, the connecting portion is formed by two lugs arranged at intervals, and the two lugs are provided with openings formed in the same axial direction, and the second end of the connecting rod extends at the connecting portion Between the ears, the second through hole is disposed coaxially with the opening on the two lugs, and the positioning post penetrates the opening and the second through hole simultaneously with the shaft.

The above objects and advantages of the present invention will be readily understood from the following detailed description of the embodiments of the invention.

(previous part)

91‧‧‧Pneumatic saw

92‧‧‧ drive gear

93‧‧‧Eccentric column

94‧‧‧Saw blade unit

95‧‧‧Transport block

951‧‧‧Long slot

96‧‧‧ gap

(part of the invention)

10‧‧‧ pneumatic tools

11‧‧‧Ontology

111‧‧‧ 容容

12‧‧ ‧ room

13‧‧‧Air motor

14‧‧‧Drive shaft

141‧‧‧ Drive tooth

15‧‧‧Links

151‧‧‧ convex ring

16‧‧‧Connecting Department

161‧‧‧ lugs

162‧‧‧ openings

17‧‧‧Tools Department

171‧‧‧ slotting

18‧‧‧ casing

19‧‧‧ Ball Bearings

191‧‧‧ shaft hole

21‧‧‧ drive gear

22‧‧‧ pivot

23‧‧‧ helical tooth

24‧‧‧Bump

241‧‧‧ shaft

31‧‧‧ Connecting rod

32‧‧‧ first end

321‧‧‧First perforation

33‧‧‧ second end

331‧‧‧Second perforation

34‧‧‧Positioning column

341‧‧‧ shaft

41‧‧‧First slide

42‧‧‧First outer wall

43‧‧‧First inner wall

51‧‧‧Second slide

52‧‧‧Second outer wall

53‧‧‧Second inner wall

61‧‧‧Tools

Figure 1 is an exploded perspective view of the present invention.

Figure 2 is a perspective view of the assembled body of the present invention.

Figure 3 is a schematic cross-sectional view of the present invention.

Figure 4 is a schematic cross-sectional view showing another perspective of the present invention.

Figures 5 and 6 are schematic views of the operation of the present invention.

Figure 7 is a schematic view of the structure of a conventional pneumatic saw.

Figure 8 is a schematic view of the operation of a conventional pneumatic saw when yaw is generated.

As shown in FIG. 1 to FIG. 4, the present invention provides a pneumatic tool 10, which mainly comprises: a body 11 having a hollow shell shape with both ends transparent, and a chamber 12 formed at one end of the body 11 A pneumatic motor 13 is disposed. The air motor 13 has a transmission shaft 14 extending into the chamber 12, and a transmission tooth portion 141 is disposed on the transmission shaft 14. The other end of the body 11 is provided along the shaft. The connecting member 15 is formed with a connecting portion 16 at one end of the connecting portion 15 , and the connecting portion 16 is formed by two spaced lugs 161 , and is disposed on the two lugs 161 . An opening 162 is formed in the same axial direction, and the connecting member 15 is disposed at a distance from the other end of the chamber 12 to provide a cutter assembly portion 17 which is embedded in the other end of the joint member 15. The block is formed, and a slot 171 for clamping the cutter 61 (for example, a saw blade or a trowel) is formed on the insert block. In the embodiment, the body 11 is further provided with a hollow tubular sleeve 18 in the other end, and the connecting member 15 is disposed in the sleeve 18, and is formed at two intervals on the outer circumference of the connecting member 15. The protruding ring portion 151 and the connecting member 15 abut against the inner wall of the sleeve 18 by the two convex ring portions 151.

Further, the body 11 is recessed with a cavity 111 on the inner wall of the opposite chamber 12, and a ball bearing 19 is disposed in the cavity 111, and a driving gear 21 is formed by a bevel gear, and one end of the driving gear 21 A pivot shaft 22 is formed, and a beveled tooth portion 23 is formed at the other end. The drive gear 21 is pivotally connected to the shaft hole 191 of the ball bearing 19 by the pivot shaft 22, so that the drive gear 21 is rotatably pivoted in the chamber 12. And a protruding post 24 is disposed at a position of the driving gear 21 away from the axial center thereof, and the driving shaft 14 is engaged with the helical tooth portion 23 by the driving tooth portion 141, so that the driving shaft 14 can drive the driving gear 21 to rotate.

The connecting portion 16 of the stud 24 and the connecting member 15 is coupled to each other by a connecting rod 31 having a first end 32 and an opposite second end 33, and the connecting rod 31 is at the first end 32. The post 24 is pivotally connected to the post 24 and the second end 33 is pivotally connected to the connecting portion 16 of the connecting member 15 . In the embodiment, the first end 32 of the connecting rod 31 defines a first through hole 321 , and a first sliding member 41 formed by a needle bearing is accommodated in the first through hole 321 , and the first sliding member 41 is hollow. The first outer wall 42 and the first inner wall 43 are annular, and the outer peripheral shape of the first outer wall 42 corresponds to the inner edge shape of the first through hole 321 so that the first outer wall 42 of the first sliding member 41 can be correspondingly received. The first inner wall 43 is shaped to correspond to the shape of the shaft 241 of the stud 24, and the stud 24 is bored by the shaft 241 and correspondingly abuts the first sliding portion. The first inner wall 43 of the member 41 allows the stud 24 to be pivotally connected to the first end 32 of the link 31.

The second end 33 of the connecting rod 31 extends between the two lugs 161 of the connecting portion 16, and a second through hole 331 is defined in the second end 33 thereof, and the second through hole 331 and the two lugs 161 are opened. The hole 162 is disposed in a relatively coaxial manner, and a second sliding member 51 formed by a needle bearing is disposed in the second through hole 331. The second sliding member 51 has a hollow annular shape and has a second outer wall 52 and a second inner portion. The outer peripheral shape of the second outer wall 52 corresponds to the inner edge shape of the second through hole 331, so that the second outer wall 52 of the second sliding member 51 can abut against the inner edge of the second through hole 331, and the second inner portion The shape of the wall 53 corresponds to the shape of the shaft 341 of the positioning post 34, and the positioning post 34 is simultaneously inserted through the opening 162 of the connecting portion 16 and the second through hole 331 of the connecting rod 31 with the shaft 341 thereof. The second end 33 of the connecting rod 31 can be pivotally connected to the connecting portion 16 of the connecting member 15 with the shaft 341 correspondingly abutting against the second inner wall 53 of the second sliding member 51.

The pneumatic tool composed of the above structural features is actually used, as shown in FIGS. 5 and 6, when the user activates the air motor 13, the drive shaft 14 drives the drive gear 2 When rotating, the eccentrically disposed stud 24 rotates around the axis of the drive gear 21, and the link 31 is pivotally connected to the stud 24 by its first end 32, and the second end 33 of the link 31 Then, the connecting portion 16 of the connecting member 15 is pivotally connected, and thus the first end 32 and the second end 33 of the connecting rod 31 can respectively form a pivot joint, so when the stud 24 starts to rotate, the joint is pulled. The rod 31 synchronously drives the coupling member 15 to reciprocately move in the axial direction of the sleeve 18.

Further, the connecting rod 31 is provided with a first sliding member 41 and a second sliding member 51 formed by a needle bearing at the pivot joints at both ends thereof (that is, the first through hole 321 and the second through hole 331), respectively. It can effectively improve the smoothness of its pivoting, and since the stud 24 is threaded by its shaft 241 and correspondingly abuts against the first inner wall 43 of the first sliding member 41, the fixing post 34 is The shaft 341 is disposed and correspondingly abuts against the second inner wall 53 of the second sliding member 51, and thereby the protrusion 24 and the first sliding member 41 and the fixing post 34 and the second sliding member 51 are respectively separable. The connection state of the fixed point pivot connection is formed, so that no gap is generated at the two pivot joints, and the joint member 15 can be effectively restricted to reciprocate only in the axial direction of the sleeve 18. There is no swaying of the yaw, and thus the pneumatic tool provided by the present invention can have the effect of the transmission, and since the transmission can effectively avoid the swaying of the yaw, it is further possible Prevent wear of components and noise.

The disclosure of the above-described embodiments is intended to be illustrative of the present invention and is not intended to limit the scope of the invention.

In summary, when it is known to those skilled in the art that the present invention can achieve the foregoing objectives, it has been in compliance with the provisions of the Patent Law, and therefore an application is made according to law.

Claims (6)

A pneumatic tool comprising: a body having a hollow shape and having a chamber, and one end of the body is terminated with a pneumatic motor, the air motor having a drive shaft extending into the chamber, and the transmission A shaft is disposed on the shaft, and the other end of the body is provided with an axially slidable connecting member, the connecting member is formed with a connecting portion toward one end of the chamber, and the connecting member is relatively far away from the chamber The other end is formed with a cutter assembly portion; a drive gear is rotatably disposed in the chamber, the drive gear has a helical tooth portion, the helical tooth portion and the transmission tooth portion mesh with each other, and the drive gear a protrusion is disposed at a position away from the axis thereof; a connecting rod has a first end and an opposite second end, and the first end of the connecting rod is pivotally connected to the protruding post, and the connecting rod is The two ends are pivotally connected to the joint of the connecting member. The pneumatic tool of claim 1, wherein the cutter assembly portion is formed by an engagement block that is plugged into the other end of the coupling member, and a clamping tool is provided on the engagement block. The slot. The pneumatic tool of claim 1, wherein the body is fixed with a hollow tubular sleeve in the other end, and the connecting member is disposed in the sleeve and is formed on the outer circumference of the connecting member. And a protruding ring portion disposed at intervals, and the connecting member is oppositely abutted against an inner wall of the sleeve by the two convex ring portions. The pneumatic tool of claim 1, wherein the first end of the connecting rod defines a first through hole, and a first sliding member is received in the first through hole, the first sliding member a first outer wall and a first inner wall, wherein the outer peripheral shape of the first outer wall corresponds to the inner edge shape of the first perforation, and the first outer wall of the first sliding member abuts An inner edge of the first perforation, the protrusion has a shaft, and the shape of the first inner wall corresponds to the shape of the shaft of the protrusion, and the protrusion is pierced by the shaft and correspondingly abuts a first inner wall of the sliding member, and a second through hole is formed in the second end of the connecting rod, and a second sliding member is received in the second through hole, the second sliding member has a hollow ring shape and has a a second outer wall and a second inner wall, wherein the outer peripheral shape of the second outer wall corresponds to the inner edge shape of the second through hole, and the second outer wall of the second sliding member abuts against the inner edge of the second through hole. The positioning post has a shaft, and the shape of the second inner wall corresponds to the shape of the shaft of the positioning post, and the positioning post simultaneously passes the connecting portion and the second through hole of the connecting rod with the shaft. And corresponding to the second inner wall of the second sliding member. The pneumatic tool of claim 4, wherein the connecting portion is formed by two spaced apart lugs, and the two lugs are provided with openings extending in the same axial direction, and the connecting rod is The second end extends between the two lugs of the connecting portion, and the second through hole is disposed coaxially with the opening of the two lugs, and the positioning post passes through the opening and the second with the shaft perforation. The pneumatic tool of claim 4, wherein the first sliding member and the second sliding member are respectively a needle bearing.