JPH0585576U - Hammer tool - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a striking element of a striking tool, and an object of the present invention is to provide a striking portion having a structure in which the outer peripheral sliding length of the striking element can be made larger than the diameter of the striking element. Is to improve the life of the. A striking element 8 reciprocates in a reciprocating piston 6 by an air spring of an air chamber 11. The striker 8 has a sliding surface length with the piston 6 larger than the diameter of the striker,
Minimize the tilt of the striker when sliding in the piston. The weight of the hitting element is optimized by setting the hitting end with the intermediate member 9 to be a concave end surface so as to be inside the sliding surface end of the hitting element.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the shape of a striker of an impact tool that strikes a tip tool through a striker such as a hammer or hammer drill.

[0002]

[Prior Art]

 The position of the striking end of the striking element of the conventional striking tool is the same as that of the front end surface of the striking element, or the convex striking end is positioned further forward.

[0003]

[Problems to be solved by the device]

 With the shape of the conventional striker described above, it is difficult to select the dimensions that optimize the diameter of the striker, the tracing length of the striker (the axial length of the sliding outer circumference) and the weight of the striker for the impact tool. There was a new problem. That is, the shape of the hitting element must satisfy the relationship of the diameter of the hitting element ≦ the tracing length of the hitting element. In the opposite case, the hitting element tilts when sliding and the galling life on the sliding surface is shortened. The diameter of the striker is to increase the air spring property of the air chamber and to receive the pressure at the time of compression. Furthermore, it is desirable that the tracing length be long so that the striker does not easily tilt. An object of the present invention is to provide a striker shape that satisfies this condition.

[0004]

[Means for Solving the Problems]

 The purpose is to strike with the length from the rear end of the striker (air chamber side) to the end face that strikes the intermediate of the striker shorter than the total length of the striker, that is, the length of the sliding outer circumference (tracing length). This is achieved by making the end face of the striker concave.

[0005]

[Action]

 As described above, a striker configured such that the axial length of the sliding outer peripheral portion of the striker is made larger than the diameter dimension of the striker and the striking end with the intermediate is inside the front end face of the striker is The reciprocating motion of the piston causes the air spring in the air chamber between the piston and the striker to make a reciprocating motion within the range of collision with the rear end (striking end) of the meson.

[0006]

【Example】

 An embodiment of the present invention is shown in FIG. The rotational movement of the output shaft pinion 1 is transmitted to the intermediate shaft 3 via the first gear 2. Further, the intermediate shaft 3 rotates the cylinder 7 via a second gear 16 provided on the cylinder 7 and constantly transmits the rotation to the tip tool 10. A reciprocating bearing 4 and a clutch 13 are rotatably loosely fitted on the intermediate shaft 3, and the clutch 13 is movable in the axial direction so that the intermediate shaft 3 and the reciprocating bear ring 4 can be engaged by a steel ball 14. It is installed in. The cylinder 7 is constantly urged forward by a spring 17 via a thrust plate 15 and a thrust bearing 18, and is arranged so as to be movable in the axial direction. The thrust plate 15 contacts the groove of the clutch 13 and engages the movement of the cylinder, and the clutch 13 also moves at the same time. When the clutch 13 is retracted, the intermediate shaft 3 and the reciprocal bearing 4 are engaged by the steel ball 14. In this structure, when the tip tool 10 is pressed against the work material as shown in FIG. 1, the cylinder 7 moves rearward against the spring 18. At the same time, the thrust plate 15 retracts, and the clutch 13 with which the thrust plate 15 abuts is retracted. When the steel ball 14 arranged between the intermediate shaft 3 and the reciprocating bearing ring 4 is engaged, the clutch 13 is fully retracted rearward, the driving force of the intermediate shaft 3 is transmitted to the reciprocating bearing 4, and the piston 6 is transferred to the piston pin. It reciprocates via 5. Further, the impact element 8 is followed by the air spring of the air chamber 11 provided in the piston 6, and the tip tool 10 is impacted via the intermediate element 9.

When the tip tool 10 is separated from the work material, the spring 17 moves the thrust plate 15, the thrust bearing 18, and the cylinder 7 forward. At the same time, since the thrust plate 15 is in contact with the groove of the clutch 13, the clutch 13 also moves forward, releasing the engagement between the intermediate shaft 3 and the reciprocating bearing 4, and stopping the reciprocating motion and the striking motion. Is. An O-ring 12 that seals air is attached to the air chamber 11 side of the striker 8, and a concave shape is provided on the opposite side so that the strike end that strikes the meson 9 is inside the outer peripheral end surface of the striker.

This makes it possible to set the outer peripheral tracing length of the striker 8 that reciprocates in the piston 6 to be larger than the diameter of the striker 8.

[0009]

[Effect of the device]

 According to the present invention, the position of the striking end between the striking member and the intermediate member of the striking member is located inside the outer end surface of the striking member such as the outer periphery of the striking member. The ratio of the sliding surface length of the striker to the diameter can be increased. Furthermore, the weight of the striker itself is reduced to reduce the load generated from the striker, the surface pressure of the sliding surface is reduced, and the striker is prevented from sagging. Have.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a striking tool according to the present invention.

FIG. 2 is an enlarged view of the periphery of the striker shown in FIG.

FIG. 3 is a perspective view of the striker shown in FIG.

[Explanation of symbols]

6 is a piston, 7 is a cylinder, 8 is a striker, and 11 is an air chamber.

Claims (1)

[Scope of utility model registration request] 1. A reciprocating piston, a cylindrical cylinder for guiding the piston, a striker disposed inside the cylinder, and a reciprocating drive through an air chamber between the striker and the piston. In the striking tool, the striking end surface of the striking element is located closer to the air chamber than the end of the outer peripheral sliding surface of the striking element.