JP2005066775A - Tool mounting device for air hammer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool mounting device for an air hammer facilitating the change of a tool. <P>SOLUTION: This tool mounting device for the air hammer for reciprocating a piston inserted in a cylinder 3 to strike the tool 7 provided at the cylinder 3 is provided with a bush 8 provided to project from the cylinder 3 to insert the tool 7 therein, and a tool support member fitted to cover the bush 8 and tool 7 to mount the tool 7 to the bush 8. A chisel engaging part 7a is formed at the tool 7, and a bush engaging part 8a is formed at the bush 8. The tool support member 9 has constitutive members 9A and a fixing member 9B for combining the constitutive members 9A with each other to integrate them. A first engaging part 9c for putting an annular projection of the bush 8, and a second engaging part 9d put in the chisel engaging part 7a of the tool 7, are formed on the inner surface of the constitutive member 9A. The constitutive members 9A are formed in radially bisected shape of a cylinder. The fixing member 9B is provided with a clamping part 9f for clamping the constitutive member, and a release part 9g for releasing the clamping. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tool mounting device for an air hammer. In particular, the present invention relates to an air hammer suitable for dropping sand or the like adhering to a cast workpiece, that is, a tool mounting device for an air hammer used in a so-called knockout machine.

  Conventional air hammers of this type include those described in Japanese Utility Model Laid-Open No. 7-20274 and those described in Japanese Patent Laid-Open No. 7-323368. (See Patent Documents 1 and 2).

  In this air hammer, a chisel is attached to a cylinder by screwing a spring into a spring screw-in part formed on the outer periphery of the cylinder tip with the chisel inserted into the cylinder.

  By the way, Japanese Utility Model Laid-Open No. 7-20274 is a so-called pistol type air hammer. However, in a knockout machine that removes sand or the like adhering to a cast workpiece, a so-called Japanese Patent Laid-Open No. 7-323368 is disclosed. A plurality of straight type air hammers may be used simultaneously (see Patent Document 3).

  In the knockout machine, a plurality of air hammers are provided upright in the box so as to strike a workpiece disposed below the air hammer.

Japanese Utility Model Publication No. 7-20274 JP-A-7-323368 Japanese Patent Laid-Open No. 10-29055

  In such a knockout machine, the chisel is usually replaced with the air hammer attached to the knockout machine. However, it is difficult to replace the chisel by attaching and removing the spring while it is attached to the box.

  An object of the present invention is to provide a tool mounting device for an air hammer in which a tool such as a chisel can be easily replaced.

In order to solve the above-mentioned problems, the air hammer tool mounting apparatus according to the present invention is configured to reciprocate a piston inserted in a cylinder by hitting a tool provided in a protruding manner at the tip of the cylinder by switching a valve. An air hammer tool attachment device for attaching a tool to an air hammer,
Provided at one end of the cylinder is a bush provided so as to protrude from the cylinder and having a tool inserted therein, and a cylindrical tool support member that is fitted onto the bush and the tool and attaches the tool to the bush. A tool engaging portion consisting of either an annular groove or an annular protrusion is formed on the side, a bush engaging portion consisting of either an annular groove or an annular protrusion is formed on the outer surface of the bush, and the tool support member is a cylinder. An annular groove and an annular protrusion having a plurality of constituent members constituting the cylindrical main body and a fixing member for integrally fixing the constituent members to each other in a cylindrical shape and fitting with the bush engaging portion on the inner surface of the cylindrical main body And a second engagement portion formed of any one of an annular groove and an annular protrusion that fits with the tool engagement portion, and the component member has a cylindrical main body in the radial direction. No minute shape, the fixing member includes a fastening portion for integrally fastening the components, and a releasing portion for releasing the clamping, but.

  In the air hammer tool mounting apparatus described above, the fixing member is made of a spring material, and includes an annular portion serving as a tightening portion and a knob portion projecting radially from the annular portion to serve as a releasing portion. It is preferable that the overlapping portion of the annular portion is reduced and the radius of the annular portion is increased so that the cylindrical main body can be separated into two components.

  According to the air hammer tool mounting apparatus of the first aspect, when the tightening by the tightening portion is released, the cylindrical main body is separated into two components, and the tool can be detached from the bush. Therefore, the tool can be easily replaced.

  According to the tool attachment device air hammer of the second aspect, the tightening portion and the annular portion can be formed with a simple configuration. Further, even if the force for bringing the knob portion close is a normal human force, the constituent members are surely integrated, so that no tool is required to bisect the cylindrical main body into the constituent members.

  Hereinafter, a tool mounting device for an air hammer according to an embodiment of the present invention will be described with reference to FIGS. The air hammer 1 strikes the work W to discharge the core S such as sand from the work W.

  The air hammer 1 is vertically attached to a fixed frame F that is installed horizontally, and strikes a workpiece W below the air hammer 1.

  On the fixed frame F, a vertical cylindrical outer cylinder 2 of an air hammer 1 is fixed. Near the upper end and near the lower end of the outer cylinder 2, a descending air inflow conduit 2c and an ascending air inflow conduit 2d through which high-pressure air is sent are provided.

  An inner cylinder 3 that moves downward and upward by high-pressure air supplied into the outer cylinder 2 through the ascending air inlet 2d and the descending air inlet 2c is inserted into the outer cylinder 2 concentrically.

  The inner cylinder 3 is loosely inserted into the hole Fa of the fixed frame F, and an annular protrusion 3 a that projects the outer cylinder 2 into an upper air chamber and a lower air chamber projects from the outer peripheral surface of the inner cylinder 3.

  A power air supply pipe 5 for supplying power air into the inner cylinder 3 is inserted through the upper end of the inner cylinder 3. Although not shown, a valve that is operated by the supplied power air is disposed on the upper part of the inner cylinder 3, and the piston 6 moves up and down by this valve to strike the chisel 7.

  A bush 8 is press-fitted into the lower portion of the inner cylinder 3 so as to protrude downward, and a chisel 7 is attached to the bush 8 so as to protrude downward. The chisel 7 is attached to the bush 8 by a cylindrical tool support member 9, and the configuration of the chisel 7, the bush 8 and the tool support member 9 will be described below.

  A chisel engaging portion 7a made of an annular groove is formed on the outer surface of a portion of the chisel 7 that protrudes downward from the bush 8. A bush engaging portion 8 a made of an annular protrusion is formed on the outer surface of the portion of the bush 8 that protrudes downward from the inner cylinder 3.

  The tool support member 9 has a cylindrical main body configured by combining two arc-shaped component members 9A and a fixing member 9B that integrates the component members 9A. On the inner surface of the cylindrical main body, a first engagement portion 9c made of an annular groove into which the bush engagement portion 8a of the bush 8 enters, and a second engagement portion made up of an annular protrusion entering the chisel engagement portion 7a of the chisel 7 9d is formed. Further, an annular groove 9e for receiving the fixing member 9B is formed on the outer surface of the cylindrical main body.

  The fixing member 9B includes two annular tightening portions 9f each having a wire-like ring shape and a double portion, and a fixing release knob portion 9g protruding radially from the annular portion 9f.

  The chisel 7 having the above configuration is attached to the bush 8 as follows.

  First, the chisel 7 is inserted into the bush 8. Next, the component members 9 </ b> A are combined into a cylindrical shape, and are fitted on the lower portions of the bush 8 and the chisel 7. At this time, the bush engaging portion 8a of the bush 8 enters the first engaging portion 9c, and the second engaging portion 9d enters the chisel engaging portion 7a of the chisel 7.

  Next, the fixing member 9B is fitted and the constituent members 9A are integrated. In order to integrate them, the annular portion 9f whose radius is increased by bringing the knob portion 9g of the fixing member 9B closer to each other is put into the annular groove 9e of the component member 9A, and then the knob portion 9g is returned to the normal position. Then, the radius of the annular portion 9f is reduced, the component 9A is tightened and integrated, and the chisel 7 is attached to the bush 8.

  On the contrary, when the chisel 7 is removed from the bush 8, the knob portion 9g in the normal position is brought closer to increase the radius of the annular portion 9f and removed from the annular groove 9e. If it does so, fixation of 9 A of structural members will be cancelled | released and the chisel 7 can be extracted from the bush 8. FIG.

  The force for bringing the knob portion 9g closer is a normal human force, and is a force that does not require a tool. Even with this level of force, the structural member 9A is reliably integrated by the fixing member 9B.

  In the air hammer 1 having the above-described configuration, the inner cylinder 3 is lowered by supplying air from 2c, the inner cylinder 3 is raised by supplying air from 2d, and the distance between the chisel 7 and the workpiece w is adjusted. The Then, by supplying air from the air supply pipe 5, the piston 6 moves up and down, the chisel 7 is hit by the piston 6, and as a result, the work W is hit by the chisel 7.

  The air hammer of the present invention is not limited to the one in the above embodiment. For example, a chisel engaging portion made of an annular protrusion may be formed on the chisel, and a second engaging portion made of an annular groove in which the chisel engaging portion is fitted may be formed on the component member. In addition, the fixing member is constituted by a leaf spring, and a plate-like knob portion protrudes from one end portion of the leaf spring. While forming an attaching part, you may make it the diameter of a fastening part change by moving a knob part within a long hole.

1 is a partially cutaway view of an air hammer to which a tool mounting device for an air hammer according to an embodiment of the present invention is applied. It is a disassembled perspective view of the principal part of the tool mounting apparatus of the same air hammer.

Explanation of symbols

1 Air Hammer 2 Outer Cylinder 2c Lowering Air Inflow Pipeline 2d Ascending Air Inflow Pipeline 3 Inner Cylinder 3a Annular Projection 5 Power Air Supply Pipe 6 Piston 7 Chisel
7a Chisel engaging part 8 Bush 8a Bush engaging part 9 Tool support member 9A Component member 9B Fixing member 9c First engaging part 9d Second engaging part 9e Annular groove 9f Annular tightening part 9g Release knob F Fixed frame Fa hole S Core W Work

Claims (2)

A tool mounting device for an air hammer that attaches a tool to an air hammer that reciprocates a piston inserted into a cylinder by hitting a tool provided in a projecting manner at the tip of the cylinder by switching a valve,
A bush provided at one end of the cylinder so as to protrude from the cylinder and having a tool inserted therein;
A cylindrical tool support member fitted to the bush and the tool to attach the tool to the bush;
The tool is formed with a tool engaging portion made of either an annular groove or an annular protrusion near the outer peripheral surface tip,
A bush engaging portion consisting of either an annular groove or an annular protrusion is formed on the outer surface of the bush,
The tool support member has a plurality of constituent members constituting the cylindrical main body, and a fixing member that fixes the constituent members in a cylindrical shape by combining the constituent members with each other,
A first engagement portion made of any one of an annular groove and an annular protrusion that fits with the bush engagement portion on the inner surface of the cylindrical main body, and a first engagement portion made of any of the annular groove and the annular protrusion that fits with the tool engagement portion. Two engaging parts are formed,
The component has a shape that bisects the cylindrical body in the radial direction,
A tool mounting device for an air hammer, wherein the fixing member includes a tightening portion that tightens the constituent members to be integrated, and a release portion for releasing the tightening. The fixing member is made of a spring material, and an annular portion serving as a tightening portion;
It consists of a knob part that protrudes in the radial direction from the annular part and serves as a release part. By bringing the knob part closer, the overlapping part of the annular part becomes smaller and the radius of the annular part becomes larger, and the cylindrical body becomes two components. The tool mounting device for an air hammer according to claim 1, wherein the tool mounting device can be separated into two parts.