JPH0121734Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an impact machine that performs chiseling work by applying an impact to a tool such as a chisel using a piston that reciprocates using a fluid such as compressed air.

[Conventional technology]

Impact machines generally house a piston in a cavity formed inside the cylinder so that it can move back and forth, and by automatically switching the flow path of compressed air by moving the piston, the impact machine intermittently hits tools such as chisels. It has a shocking composition. This flow path consists of a ventilation hole formed in the longitudinal direction of the cylinder around a cavity inside the cylinder, and a small hole for communicating this ventilation hole with the cavity.

Conventionally, when creating a ventilation hole in a cylinder, the side wall of the cylinder was directly drilled to form the hole, so the side wall of the cylinder needed to have a certain thickness after the cavity was formed. For this reason, the outer diameter of the cylinder has a certain limit due to processing problems, and the outer diameter of the cylinder has to be considerably larger than the piston diameter.

Particularly in small impact machines used for light work such as engraving, metal engraving, and plaster processing, the outer diameter of the cylinder is larger than necessary, making it inconvenient to handle.

[Problem that the invention attempts to solve]

Therefore, this idea solves the above-mentioned difficulties of the conventional example, and because the wall thickness of the cylinder is small, the entire impact machine can be made smaller.Moreover, it is very easy to process the fluid flow path formed in the cylinder. The purpose is to provide a machine.

[Means for solving problems]

The technical measures taken by this invention to solve the above problems are as follows.

That is, a cylinder 1 has a cavity 3 inside and a tool such as a chisel 5 is attached to the front end so as to be movable back and forth, and the cylinder 1 is housed in the cavity 3 and intermittently impacts the tool by reciprocating. A piston 4 having at least two large diameter parts adapted to apply force, a sleeve 24 attached to the outer periphery of the cylinder 1, and another piston 4 connected to a fluid supply source provided at the rear of the cylinder 1. a small hole 12 provided in the side wall of the cylinder 1 through which a supply channel supplies fluid from the other cavity 14 to the large diameter portion of the piston 4; 1
3, and a groove 11 formed on the outer surface of the side wall so as to connect the small holes 12 and 13 to each other, and whose opening is closed by the sleeve 24.
and a communication flow path that passes through the side wall of the cylinder 1 and supplies fluid between the large diameter portions of the piston 4 to a space behind the large diameter portion when the piston 4 is at the rearmost end. small holes 19 and 20 provided in the side wall, and a groove 16 formed on the outer surface of the side wall so as to connect the small holes 19 and 20 to each other and whose opening is closed by the sleeve 24. When the piston 4 is at the frontmost end, a communication flow path for supplying fluid between the large diameter portions of the piston 4 to the space in front of the large diameter portion extends through the side wall of the cylinder 1. The small holes 17 and 18 provided, and the groove 15 formed on the outer surface of the side wall so as to connect the small holes 17 and 18 to each other and whose openings are closed by the sleeve 24. Further, a discharge flow path for discharging the fluid in the cylinder 1 to the outside includes small holes 22 and 23 provided in the side wall of the cylinder 1 so as to penetrate therethrough, and the small hole 22 on the outer surface of the side wall. , 23, and a groove 21 whose opening is closed by the sleeve 24.

[Effect]

Therefore, the openings of the grooves 11, 16, 15, and 21 formed on the outer surface of the side wall of the cylinder 1 are closed by the sleeve 24 attached to the outer side of the side wall of the cylinder 1, and the small holes are closed. 12, 13, 19, 2
0, 17, 18, 22, and 23 can serve as communication holes that communicate with each other. For this reason, each groove 11, 16, 15, 21 and each small hole 12, 1
3, 19, 20, 17, 18, 22, 23, fluid is supplied to cylinder 1, and cylinder 1
It is possible to drain fluid from.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 1 is an overall view of the impact machine according to this invention, and hereinafter, when viewing the drawings, the left side will be referred to as the front. 1 is a cylinder, 2 is a valve case connected to the rear end of the cylinder 1, and these form the main body of the impact machine. A piston 4 is reciprocatably housed in a cavity 3 formed inside the cylinder 1, and its front end surface is in contact with the rear end surface of a chisel 5 fitted into the front end of the cylinder 1 so as to be reciprocally movable. It's getting old. When the piston 4 reciprocates with compressed air,
Impact force is applied to the chisel 5 intermittently.

Reference numeral 6 denotes a ball for preventing the chisel 5 from coming off. This ball 6 is fitted into a fitting hole 7, and can be taken out by attaching and detaching a retaining ring 8.

A cylinder cover 9 is fitted to the rear end of the empty chamber 3 and supported by the valve case 2 via a damper 10.

The following grooves and small holes are formed on the outer surface of the side wall of the cylinder 1. That is, a first groove 11 is formed in the lower part of the outer surface, as shown in FIG.
A first small hole 12 in which a small hole 13 is formed communicates with a cavity 14 outside the cylinder cover 9, and a second small hole 13 communicates with a central portion of the cavity 3. The piston 4 has two large diameter parts, and the second small hole 1
3 always communicates with the space between the two large diameter portions regardless of the position of the piston 4. The small holes 12 and 13 and the groove 11 form a supply flow path for supplying compressed air into the cylinder 1.

Further, on the side of the outer surface, as shown in FIGS. 3 and 4, a second groove 15 and a third groove 16 are formed, and each groove has two small holes, that is, a third groove.
Small hole 17, fourth small hole 18, fifth small hole 19, sixth small hole
A small hole 20 is formed. The third small hole 17 communicates with the front end of the cavity 3, and the sixth small hole 20 communicates with the rear end of the cavity 3. Further, the fourth small hole 18 is located at a position communicating with the space between both large diameter parts of the piston 4 when the piston 4 moves most forward, and the fifth small hole 19 is located at a position communicating with the space between both large diameter parts of the piston 4 when the piston 4 moves most backward. It is located at a position that communicates with the space between both large diameter portions of the piston 4. The second groove 15, the third small hole 17 and the fourth
The small hole 18 constitutes one communication channel, and the third groove 16, the fifth small hole 19, and the sixth small hole 20
also constitutes another communication flow path.

Further, a fourth groove 21 is formed in the upper part of the outer surface as shown in FIG. 5, and this groove 21 communicates with the cavity 3 through a seventh small hole 22 and an eighth small hole 23. There is. The seventh small hole 22 communicates with the third small hole 17 through the space in front of the piston 4 when the piston 4 moves most backward, and the eighth small hole 23 communicates with the third small hole 17 when the piston 4 moves most forward. It communicates with the sixth small hole 20 through the space behind the piston 4. The fourth groove 21, the seventh small hole 22, and the eighth small hole 23 constitute a discharge flow path.

A sleeve 24 is fitted onto the outer surface of the cylinder 4 so as to cover each of the grooves described above. Since this sleeve 24 is in close contact with the outer surface of the cylinder 4, air will not leak from these gaps.
An exhaust port 25 is formed in the sleeve 24,
This exhaust port 25 communicates with the fourth groove 21.

Inside the valve case 2, an air supply valve 29 is provided in the middle of the ventilation hole 26, which is formed by a ball 28 pressed by a spring 27 on the side wall of the ventilation hole 26. The air supply valve 29 is opened and closed via a push rod 31 by pressing the operating lever 30 . Vent hole 26
is an air supply port 3 formed on the rear end surface of the valve case 2.
2 and vacant room 14 are in contact.

Reference numeral 33 denotes an adjustment handle, which allows the number of blows to be adjusted by adjusting the flow rate of compressed air.

Next, the operating state of the impact machine according to this invention will be explained.

When compressed air is supplied from the air supply port 32 and the operating lever 30 is pressed, the compressed air enters the cavity 14 through the ventilation hole 26, and then enters the first small hole 12, the first groove 11, and the second small hole. 13 into the space between the two large diameter parts of the piston 4.

When the piston 4 is in the state shown in FIG.
It reaches the front of the piston 4 through a communication channel consisting of the small hole 18, the second groove 15, and the third small hole 17, and presses the piston 4 backward. At this time, piston 4
The compressed air behind the 8th small hole 23 and the 4th groove 21
Since the piston 4 is discharged from the exhaust port 25 through the discharge flow path, the piston 4 moves rearward.

The state in which the piston 4 is moved to the rearmost position, that is, the space between both large diameter parts of the piston 4 is the fifth small hole 19.
When the compressed air is in communication with the fifth small hole 19,
It reaches the rear of the piston 4 through a communication channel consisting of the third groove 16 and the sixth small hole 20, and presses the piston 4 forward. At this time, the compressed air in front of the piston 4 is discharged from the exhaust port 25 through the discharge flow path consisting of the seventh small hole 22 and the fourth groove 21, so the piston 4 moves forward. Become.
During this process, the rear end surface of the chisel 5 is struck. Repeat this from now on.

[Effect of idea]

This invention has the above-mentioned configuration, and has the following unique effects.

(a) The supply, discharge and movement of fluid such as compressed air to the cavity 3 in the cylinder 1 is carried out through small holes 12, 13, 17 provided in the side wall of the cylinder 1 through the holes 12, 13, 17.
18, 19, 20, 22, 23 and cylinder 1
Concave grooves 11, 15, 16, 21 formed on the outer surface of
Since this is carried out through a flow path consisting of ,15,1
6 and 21 can be formed very shallow by reducing the depth, and therefore the wall thickness of the side wall of the cylinder 1 can be made very thin. For this reason,
The impact machine can be made smaller and lighter. Further, if the depth of the grooves 11, 15, 16, 21 is small and the cross-sectional area of the flow path is insufficient, this can be easily dealt with by widening the width.

(b) Since the grooves 11, 15, 16, and 21 can be easily machined with a tool such as an end mill,
This is much simpler and easier to manufacture than the conventional method of drilling the side wall of the cylinder 1 along its central axis using a drill press or the like. This also contributes to reducing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the impact machine according to this invention. FIG. 2 is a side view of the same. FIG. 3 is a longitudinal sectional plan view of the cylinder. Figure 4 is a rear view of the same. FIG. 5 is a plan view of the same part. FIG. 6 is a bottom view of the same part. 1...Cylinder, 3...Empty chamber, 4...Piston, 5...Chisel, 11, 15, 16, 21...
Concave groove, 12, 13, 17, 18, 19, 20, 2
2, 23...Small hole, 24...Sleeve.

Claims (1)

[Claims for Utility Model Registration] A cylinder 1 having a vacant chamber 3 inside and having a tool such as a chisel 5 attached to the front end so as to be movable back and forth.
a piston 4, which is housed in the cavity 3 and has at least two large-diameter portions and is configured to intermittently apply an impact force to the tool through reciprocating motion; Sleeve 24 and
and another cavity 14 communicating with a fluid supply source provided at the rear of the cylinder 1, and a supply channel for supplying fluid between the large diameter portions of the piston 4 from the other cavity 14. , a small hole 12,1 formed in the side wall of the cylinder 1 and passing through it.
3, and a groove 11 formed on the outer surface of the side wall so as to connect the small holes 12 and 13 to each other, and whose opening is closed by the sleeve 24.
and a communication flow path that passes through the side wall of the cylinder 1 and supplies fluid between the large diameter portions of the piston 4 to a space behind the large diameter portion when the piston 4 is at the rearmost end. small holes 19 and 20 provided in the side wall, and a groove 16 formed on the outer surface of the side wall so as to connect the small holes 19 and 20 to each other and whose opening is closed by the sleeve 24. When the piston 4 is at the frontmost end, a communication flow path for supplying fluid between the large diameter portions of the piston 4 to the space in front of the large diameter portion extends through the side wall of the cylinder 1. The small holes 17 and 18 provided, and the groove 15 formed on the outer surface of the side wall so as to connect the small holes 17 and 18 to each other and whose openings are closed by the sleeve 24. Further, a discharge flow path for discharging the fluid in the cylinder 1 to the outside includes small holes 22 and 23 provided in the side wall of the cylinder 1 so as to penetrate therethrough, and the small hole 22 on the outer surface of the side wall. , 23 and a concave groove 21 whose opening is closed by the sleeve 24.