TWI602665B - Quick release of pneumatic tools - Google Patents

Description

Pneumatic tool quick release device

The invention relates to an impact tool, in particular to a quick release device for a pneumatic tool.

Referring to Figure 1, a pneumatic tool 10 includes a gun body 11, a cylinder unit 12 disposed on the gun body 11 and extending along an axis L1, one of which is drivable by the cylinder unit 12 and linearly movable along the axis L1. The hammer 13 and a quick release device 14 mounted between the cylinder unit 12 and the hammer 13.

The cylinder unit 12 has a cylinder 121 and a piston 122 that can be driven by high pressure gas.

The hammer 13 has a driven rod 131 located in the cylinder 121 and drivable by the piston 122, a chisel rod 132 connecting the driven rod 131, and a convex ring disposed on the chisel rod 132. 133.

The quick release device 14 has a fixing sleeve 15 which is screwed to the cylinder 121, and a movable sleeve 16 which is movably sleeved outside the fixing sleeve 15 along the axis L1, and a set is placed on the fixed sleeve a sleeve 17 is disposed outside the sleeve 17 and a spring 17 between the movable sleeve 16 and the fixed sleeve 15 . The fixed sleeve 15 is inserted to block the movable sleeve. A retaining ring 18 of 16 and a plurality of positioning beads 19 embedded in the fixing sleeve 15 . The movable sleeve 16 has an inner cylindrical surface 161 and a back ring groove 162 disposed on the inner cylindrical surface 161 .

The movable sleeve 16 is pushed by the spring 17 to make the movable sleeve 16 have a tendency to move toward the buckle 18, and the inner cylinder surface 161 of the movable sleeve 16 can be pressed against the positioning beads 19, The convex ring 133 of the hammer 13 can be blocked by the positioning beads 19, thereby preventing the hammer 13 from being detached from the cylinder 121 during the forward movement. Referring to FIG. 2, when the user wants to replace the chisel The hammer 13 only needs to push or pull the movable sleeve 16 backward along the axis L1 to align the back ring groove 162 with the positioning beads 19, so that the hammer 13 can be along the axis L1. The front ring is pulled, and the protruding ring 133 can push the positioning beads 19 into the back ring groove 162 without being blocked by the positioning beads 19, so that the hammer 13 can be disengaged from the cylinder 121.

Although the pneumatic tool 10 has the above-mentioned effects, the following problems still exist:

1. Referring to Figures 1 and 2, the movable sleeve 16 is movable from the blocking position to the non-blocking position by pushing or pulling the movable sleeve 16 to move along the axis L1. There must be an axial movement spacing 101 between the fixed sleeves 15. There must also be an axial movement spacing 102 between the movable sleeve 16 and the buckle 18 to enable the movable sleeve 16 to move axially. Space, in this way, during operation, it is easy to be pinched by the user's fingers accidentally placed in the axial movement intervals 101, 102, and the safety of use is not good.

2. The movable sleeve 16 is pushed by the spring 17 and has the characteristic of being automatically reset after the external force disappears. It is often caused that the finger is still placed in the axial movement interval 102 after the user releases the movable sleeve 16. However, the movable sleeve 16 that is automatically reset is pinched, and the use safety is not good.

3. Because the operating direction of the movable sleeve 16 is the same as the working direction of the hammer 13 , it is linearly moved along the axis L1. In addition, the movable sleeve 16 is easier because the hammer 13 is in operation. When it is touched by a foreign object, linear movement occurs, which causes the hammer 13 to fall off accidentally, which affects work efficiency.

Accordingly, it is an object of the present invention to provide a quick release device for a pneumatic tool which can prevent a user's fingers from being pinched to improve the safety of use while avoiding accidental dropping of the hammer during operation.

Thus, the quick release device of the present invention is suitable for mounting on a pneumatic tool comprising a gun body, a cylinder unit disposed on the gun body, and a chisel inserted in the cylinder unit and extending along an axis a hammer having a cylinder coupled to the gun body and defining a first axial passageway around the axis, and a piston located in the first axial passage, the hammer including an insert a first axial passage is a driven rod driven by the piston, a chisel rod connected to the driven rod, and a convex ring disposed on the chisel rod, the quick release device comprises a fixed cylinder and an operation a barrel, a blocking unit and a buckle.

The fixed barrel is coupled to the cylinder and extends in the opposite direction of the gun body along the axis, the fixed barrel defining a second axial passage surrounding the axis and communicating with the first axial passage, the second shaft The passage channel is for receiving the convex ring of the hammer.

The operating cylinder is rotatably disposed outside the fixed cylinder about the axis, and includes an inner cylinder surface and an outer cylinder surface.

The blocking unit includes a plurality of radial perforations disposed in the fixed cylinder and communicating with the second axial passage, respectively, a plurality of blocking beads movably mounted in the radial perforations, and respectively corresponding to the radial direction a plurality of beading portions disposed on the inner cylinder surface of the operation cylinder, the barrier beads being movable between a blocking position and a non-blocking position relative to the convex ring of the hammer, when the operation cylinder is inside The tubular surface is pressed against the blocking beads, the blocking beads are located at the blocking position, and the convex ring is blocked to prevent the hammer from being detached from the fixed cylinder, and when the operating cylinder is rotated, the protruding beads are aligned with the blocking The beads, the barrier beads can enter the retraction and move to the non-blocking position such that the chisel can be detached from the fixed barrel.

The buckle is fixedly mounted on the fixing cylinder to prevent the operating cylinder from being detached from the fixing cylinder.

The invention has the effect that the invention can prevent the user's fingers from being pinched to improve the safety of use by rotating the operation cylinder so that the barrier beads are located at the blocking position or the non-blocking position, and the hammer can be avoided. Unexpected fall off during work.

20‧‧‧ pneumatic tools

21‧‧‧ gun body

211‧‧‧ guns

41‧‧‧ inner cylinder

42‧‧‧Outer tube surface

50‧‧‧block unit

212‧‧‧ gun body

22‧‧‧Cylinder unit

221‧‧‧Cylinder

222‧‧‧First axial channel

223‧‧‧Piston

23‧‧‧Chisel

231‧‧‧Driver

232‧‧‧Drilling rod

233‧‧ ‧ convex ring

30‧‧‧ fixed cylinder

31‧‧‧Second axial channel

40‧‧‧Operator

51‧‧‧radial perforation

52‧‧‧Blocking beads

53‧‧‧Withdrawing

60‧‧‧ buckle

70‧‧‧Carmen unit

71‧‧‧Axial groove

72‧‧‧ accommodating holes

73‧‧‧Flexible parts

74‧‧‧Kanzhu

L2‧‧‧ axis

80‧‧‧Arrow

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: Figure 1 is a cross-sectional view of a conventional pneumatic tool showing a hammer in a blocked state; Figure 2 is a similar Figure 1 is a view showing the hammer in an unblocked state; Figure 3 is an external view showing an embodiment of the quick release device of the present invention mounted on a pneumatic tool; Figure 4 is an exploded perspective view showing a gun body, a cylinder unit and a hammer of the pneumatic tool, the embodiment comprises a fixed cylinder, an operating cylinder, a blocking unit, a latching unit and a buckle; FIG. 5 is another angle of the operating cylinder Figure 6 is an incomplete sectional view of the embodiment showing that the number of blocking beads of the blocking unit is in a blocking position to prevent the hammer from being detached from the fixed cylinder; Figure 7 is taken from Figure 3 A cross-sectional view of line VII-VII showing that the barrier beads are located at the blocking position; and FIG. 8 is a cross-sectional view taken from line VIII-VIII of FIG. 3, showing the state in which the operation cylinder is jammed by the cassette unit; Is a view similar to Figure 7, showing the rotation As the number of cylinder back bead portion aligned such barrier beads; Figure 10 is a view similar to Figure 6, showing the blocking beads being pushed into the non-blocking position by the convex ring of the chisel, and the state in which the convex ring can pass the blocking beads; Figure 11 Is a view similar to FIG. 9 showing the state in which the blocking beads enter the retracting bead and are in the non-blocking position, and FIG. 12 is a view similar to FIG. 10, showing the chiseling off the fixed cylinder; FIG. Similar to the view of Fig. 7, it is shown that four backing portions and four axial grooves are provided, and the backing portions are staggered from the axial grooves; and Fig. 14 is a view similar to Fig. 6, showing The fixed cylinder is connected to a cylinder screw.

The present invention will be described in detail below with reference to the drawings and embodiments. Before the present invention is described in detail, the relative positional terms used in the following description, such as "front" and "rear", are The indication and normal use orientation are the benchmark.

Referring to FIGS. 3-6, an embodiment of the quick release device of the present invention is suitable for being mounted on a pneumatic tool 20, the pneumatic tool 20 including a gun body 21, a cylinder unit 22 disposed on the gun body 21, and a a hammer 23 inserted in the cylinder unit 22 and extending along an axis L2. The gun body 21 has a gun handle 211 and a gun body 212. The cylinder unit 22 has a coupling body 212 and defines a surrounding portion. a cylinder 221 of the first axial passage 222 of the axis L2, located in the first axial passage 222 and capable of being pressurized with high pressure gas a piston 223 that is driven to move back and forth along the axis L2. The hammer 23 includes a driven rod 231 that is inserted into the first axial passage 222 and can be driven by the piston 223, and a chisel that connects the driven rod 231. The arbor 232 and a convex ring 233 disposed on the boring bar 232 have general knowledge in the technical field of the present invention due to the structure and action of the gun body 21 and the cylinder unit 22 and the hammer 23 It is easy to understand, and it is not the feature of the present invention, so the detailed structure and the action means are not described herein.

The embodiment of the present invention comprises a fixed cylinder 30, an operating cylinder 40, a blocking unit 50, a buckle 60 and a cassette unit 70.

The fixing cylinder 30 is connected to the cylinder block 221 and extends in the opposite direction of the gun body 212 of the gun body 21 along the axis L2. The fixing cylinder 30 defines a circumference around the axis L2 and the first axial passage 222. A second axial passage 31 that is in communication. The second axial passage 31 is configured to receive the convex ring 233 of the hammer 23, the second axial passage 31 has a large aperture section and a small aperture section, and the aperture of the small aperture section is smaller than the convex ring 233 The outer diameter, by which the convex ring 233 cannot enter the small aperture section, can control the retracting stroke of the hammer 23.

The operation cylinder 40 is sleeved around the fixed cylinder 30 so as to be rotatable about the axis L2, and includes an inner cylinder surface 41 and an outer cylinder surface 42.

The blocking unit 50 includes a plurality of radial through holes 51 disposed in the fixed cylinder 30 and communicating with the second axial passage 31, respectively movably mounted on the radial wear A plurality of blocking beads 52 in the holes 51 and a plurality of decanting portions 53 respectively corresponding to the radial perforations 51 are provided in the inner cylindrical surface 41 of the operating cylinder 40.

The blocking beads 52 are movable between a blocking position (see FIGS. 6 and 7) and a non-blocking position (see FIGS. 10 and 11) relative to the convex ring 233 of the hammer 23, when the operating cylinder The inner cylinder surface 41 of the 40 is pressed against the blocking beads 52, and the blocking beads 52 are located in the blocking position at the same time in front of the convex ring 233, so that when the hammer 23 moves forward, the blocking beads can be used 52 blocking the convex ring 233 to prevent the hammer 23 from coming off the fixed cylinder 30. When the operating cylinder 40 is rotated to align the falling beads 53 with the blocking beads 52, the blocking beads 52 can move into the retreating The bead 53 is located in the non-blocking position so that the hammer 23 can be detached from the fixed barrel 30.

In this embodiment, the retreating portions 53 are communicating with the through-holes of the outer cylinder surface 42 and the inner cylinder surface 41. This allows the user to conveniently view whether the retreating portions 53 are aligned with the blocking beads 52. However, the anti-bead portion 53 may be a blind hole that does not connect the outer cylinder surface 42 and the inner cylinder surface 41, and is fitted with a mark corresponding to the position of the outer cylinder surface 42 corresponding to the retreat portions 53. The user can easily know whether the anti-bead portions 53 are aligned with the blocking beads 52.

The buckle 60 is fixedly mounted outside the fixed cylinder 30 and located in front of the operating cylinder 40, so that the operating cylinder 40 can be restrained between the buckle 60 and the fixed cylinder 30 to prevent the operating cylinder 40 from being detached from the The cartridge 30 is fixed.

Referring to FIG. 4 , FIG. 5 and FIG. 8 , the latch unit 70 includes a plurality of axial grooves 71 disposed on the inner cylinder surface 41 of the operating cylinder 40 and extending along the axis L2 , and a capacity disposed on the fixed cylinder 30 . The hole 72, an elastic member 73 mounted in the receiving hole 72, and a resilient member 73 mounted in the receiving hole 72, and having a constant orientation toward the operating cylinder 40 74, when the card bead 74 enters one of the axial grooves 71, the operating cylinder 40 can be given a rotational clamping force, and in the case where the rotational force of the operating cylinder 40 is greater than the rotational clamping force, The operation cylinder 40 can be rotated, and thus, the positioning effect of the operation cylinder 40 can be improved, so that the operation cylinder 40 is not easily rotated.

In this embodiment, the number of the radial through holes 51, the blocking beads 52, and the backing beads 53 are all four, and are disposed at an equal angle, that is, 90 degrees, and the number of the axial grooves 71. It is eight, and is equiangular, that is, 45 degrees. Thus, four axial grooves 71 are in communication with the retreating portions 53, and the four axial grooves 71 are staggered and disconnected from the retreating portions 53. The operation cylinder 40 is clamped every time it is rotated by 45 degrees, and the operation cylinder 40 can be jammed without being easily rotated regardless of whether the barrier beads 52 are in the blocking position or the non-blocking position. effect.

Referring to FIG. 13, it is easy to understand that the number of the axial grooves 71 may be four and is not connected to the backing portions 53 so that only when the blocking beads 52 are at the blocking position, The operating cylinder 40 will be jammed.

Referring to Figures 6, 7, and 8, when the hammer 23 is in the working state, the operating cylinder 40 must be rotated to a position where the inner cylinder surface 41 presses against the blocking beads 52, such as Therefore, the blocking beads 52 are located at the blocking position while being restrained from moving in the radial through holes 51. When the hammer 23 is driven forward by the piston 223 along the axis L2, by the When the blocking bead 52 blocks the convex ring 233, the hammer 23 can be prevented from coming off the fixing cylinder 30.

Referring to FIG. 9 to FIG. 12, when the hammer 23 is to be replaced, the operation cylinder 40 is first rotated to align the ball-removing portions 53 with the blocking beads 52, and then the hammer 23 is pulled forward along the axis L2. (See the direction of the arrow 80 in FIG. 10). When the convex ring 233 touches the blocking beads 52, the blocking beads 52 can be pushed into the radial through holes 51 and enter the falling beads 53. And then moving the blocking beads 52 to the non-blocking position, and continuously pulling the hammer 23 forward, the hammer 23 can be disengaged from the fixing cylinder 30, referring to FIG. 6, waiting for the new hammer 23 to be inserted After the first axial passage 222, the operating cylinder 40 is rotated, and the inner cylinder surface 41 is pressed against the blocking beads 52 again, so that the blocking beads 52 can be moved to the blocking position again and can start working. .

It should be noted that, referring to FIG. 6 , the fixed cylinder 30 and the cylinder 221 of the present invention may be an integral connection structure. Referring to FIG. 14 , the fixed cylinder 30 and the cylinder 221 of the present invention may also be a screw-lock connection structure. The advantage of the structure shown in Fig. 14 is that it is not necessary to modify the conventional pneumatic tool, and it is only necessary to screw the fixing cylinder 30 of the present invention to the cylinder block 221, and it can be used.

In summary, the quick release device of the pneumatic tool of the present invention has the following advantages and advantages, and thus the object of the present invention can be achieved.

1. The present invention is to rotate the operating cylinder 40 such that the blocking beads 52 are in the blocking position or the non-blocking position because there is no need to push or pull the operating cylinder 40 to move along the axis L2, and the operation does not need to exist. The axial movement distance of the cylinder 40 can prevent the user's fingers from being pinched and can improve the safety of use.

2. The present invention is to rotate the operating cylinder 40 such that the blocking beads 52 are located at the blocking position or the non-blocking position because the operating direction is different from the working direction of the hammer 23, and the operating cylinder 40 is less susceptible to external forces. When the touch is generated, the rotation is generated, so that the probability that the hammer 23 accidentally disengages from the fixed cylinder 30 can be reduced, and the work efficiency can be improved.

3. The card cartridge unit 70 of the present invention can produce a click effect on the operation cylinder 40, so that the operation cylinder 40 is not easily rotated, thereby effectively preventing the hammer 23 from being detached from the fixed cylinder 30. Improve work efficiency.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

21‧‧‧ gun body

211‧‧‧ guns

212‧‧‧ gun body

22‧‧‧Cylinder unit

221‧‧‧Cylinder

23‧‧‧Chisel

231‧‧‧Driver

232‧‧‧Drilling rod

42‧‧‧Outer tube surface

50‧‧‧block unit

51‧‧‧radial perforation

52‧‧‧Blocking beads

53‧‧‧Withdrawing

60‧‧‧ buckle

70‧‧‧Carmen unit

71‧‧‧Axial groove

233‧‧ ‧ convex ring

30‧‧‧ fixed cylinder

40‧‧‧Operator

41‧‧‧ inner cylinder

72‧‧‧ accommodating holes

73‧‧‧Flexible parts

74‧‧‧Kanzhu

Claims (8)

A quick release device for a pneumatic tool, which is suitable for being mounted on the pneumatic tool, the pneumatic tool comprising a gun body, a cylinder unit disposed on the gun body, and a chisel inserted in the cylinder unit and extending along an axis a hammer having a cylinder coupled to the gun body and defining a first axial passageway around the axis, and a piston located in the first axial passage, the hammer including an insert a first axial passage is a driven rod driven by the piston, a chisel rod connected to the driven rod, and a convex ring disposed on the chisel rod, the quick release device comprises: a fixed cylinder, and The cylinder is coupled and extends in the opposite direction of the gun body along the axis, the stationary cylinder defining a second axial passageway around the axis and in communication with the first axial passage, the second axial passage being for a collar for receiving the hammer; an operating cylinder that is rotatably disposed around the fixed cylinder and includes an inner cylinder surface and an outer cylinder surface; and a blocking unit including a plurality of Fixing the cylinder and communicating the radial perforations of the second axial passage, respectively a plurality of barrier beads movably mounted in the radial perforations, and a plurality of repellent portions respectively disposed on the inner cylindrical surface of the operation cylinder corresponding to the radial perforations, the barrier beads being opposite to the Moving between a blocking position and a non-blocking position of the convex ring of the hammer, when the inner cylindrical surface of the operating cylinder is pressed against the blocking beads, the blocking beads are located at the blocking position, and the convex ring can be blocked to prevent The hammer is disengaged from the fixed cylinder, and when the operating cylinder is rotated to align the falling beads to the blocking beads, the blocking beads can enter The ball is moved into the non-blocking position to enable the hammer to be detached from the fixed cylinder; and a buckle is mounted and fixed on the fixed cylinder to prevent the operating cylinder from being detached from the fixed cylinder. The quick release device for a pneumatic tool according to claim 1, wherein the fixed cylinder and the cylinder are integrally connected. The quick release device for a pneumatic tool according to claim 1, wherein the fixed cylinder and the cylinder are screw-locked. The quick release device for a pneumatic tool according to claim 2 or claim 3, further comprising a latching unit, comprising: a plurality of axial grooves disposed on the inner cylindrical surface of the operating cylinder and extending along the axis, one disposed on The accommodating hole of the fixing cylinder, an elastic member installed in the accommodating hole, and a cymbal bead which is mounted in the accommodating hole and is pushed by the elastic member, and has a tendency to move toward the operating cylinder. When the latching bead enters one of the axial grooves, the operating cylinder can be given a turning force. The quick release device for a pneumatic tool according to claim 4, wherein the retreating portions of the blocking unit are through holes of the outer cylinder surface and the inner cylinder surface of the operation cylinder. The quick release device for a pneumatic tool according to claim 5, wherein the radial perforations, the number of the blocking beads and the retreating portions are all four, and are disposed at equal angles. The quick release device for a pneumatic tool according to claim 6, wherein the number of the axial grooves is four, and is disposed at an equal angle, and is not connected to the abduction portions. The quick release device for a pneumatic tool according to claim 6, wherein the number of the axial grooves is eight and is equiangularly arranged, wherein four axial grooves communicate with the retreating portions, and the other four axes The groove is staggered from the beading portions.