Tip tool holding member and impact tool

Abstract

To provide a tip tool holding member that does not interfere with work. [Solution] A tip tool holding member (30) has an attachment section (31) arranged at the rear end, and a holding section (32) formed continuously from the tip of the attachment section (31) and arranged at the tip, and an insertion hole (35) through which the tip tool (20) is inserted is formed at the tip of the holding section (32), and the insertion hole (35) is shaped so that the locking section (21) formed on the tip tool (20) cannot be inserted into it, and the part of the wire rod of the attachment section (31) on the tip tool (20) side is a helical convex section (37), and the wire rod of the attachment section (31) elastically deforms relative to a helical concave groove (11) formed helically around the axis of the tip tool (20) on the outer peripheral surface of the tip of the tool body (10), causing the inner diameter of the attachment section (31) to increase and the helical convex section (37) to be crimped, thereby attaching the attachment section (31) to the tool body (10).

Description

[Technical Field]

[0001] The present invention relates to a tip tool holding member for holding a tip tool on a tool body, and to an impact tool equipped with the tip tool holding member. [Background technology]

[0002] BACKGROUND ART Conventionally, a tip tool holding member having a coil spring shape for holding a tip tool on a tool body of an impact tool, such as the spring retainer disclosed in Patent Document 1, has been known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication No. 52-005166 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional tip tool holding members as described above, a protruding portion that protrudes outward is formed to serve as a knob to facilitate attachment and detachment, but this protruding portion often gets in the way when working with an impact tool. Specifically, when it is desired to apply an impact to the deep part of a groove or hole formed in a workpiece, the working environment is narrow, and this protruding portion gets caught on the protrusion of the groove or hole and cannot reach the deep part, making it impossible to perform the work properly, or the worker's hand gets caught in the protruding portion.

[0005] Therefore, an object of the present invention is to provide a tip tool holding member that does not interfere with work.

[0006] Another object of the present invention is to provide an impact tool equipped with a tip tool holding member that does not interfere with work. [Means for solving the problem]

[0007] The present invention relates to a tip tool holding member having a coil spring shape formed by spirally winding a wire rod for holding a tip tool on a tool body of an impact tool, wherein an attachment part to be attached to the tip part of the tool body is arranged on the base end side, a holding part formed continuously with the tip of the attachment part is arranged on the tip side, an insertion hole part through which the tip tool is inserted is formed at the tip of the holding part, and the insertion hole part has a shape that prevents an engagement part formed on the tip tool from being inserted, and a portion of the wire rod of the attachment part on the tip tool side is made into a spiral convex part, The tip tool holding member is characterized in that the wire rod of the attachment part elastically deforms relative to a helical concave groove part formed helically around the axis of the tip tool on the outer peripheral surface of the tip part of the tool body, thereby increasing the inner diameter of the attachment part and causing the helical convex part to be pressed against the attachment part, thereby elastically contacting the tool body, the tip tool is inserted into the insertion hole part in an attachment state in which the attachment part is attached to the outer peripheral surface of the tip part of the tool body, and the helical convex part at the base end of the attachment part is also pressed against the helical concave groove part in the attachment state.

[0008] The present invention is also an impact tool comprising a tool body, a tip tool held by the tool body, and a tip tool holding member having a coil spring shape formed by spirally winding a wire rod for holding the tip tool on the tool body, wherein the tip tool holding member has an attachment portion attached to the tip part of the tool body arranged on the base end side, and a holding portion formed continuously with the tip of the attachment portion arranged on the tip end side, and an insertion hole portion through which the tip tool is inserted is formed at the tip of the holding portion, and the insertion hole portion has a shape that prevents an engagement portion formed on the tip tool from being inserted, and the wire rod of the attachment portion is a portion of the attachment portion on the tip tool side is a helical convex portion, an inner diameter of the attachment portion increases as the wire rod of the attachment portion elastically deforms relative to a helical concave groove portion formed helically around the axis of the tip tool on the outer circumferential surface of the tip part of the tool body, and the helical convex portion is pressed against the attachment portion, thereby elastically contacting the tool body, the tip tool is inserted into the insertion hole in an attachment state in which the attachment portion is attached to the outer circumferential surface of the tip part of the tool body, and the helical convex portion at the base end of the attachment portion is also pressed against the helical concave groove portion in the attachment state.

[0009] In such a configuration, the tip tool is prevented from being unintentionally detached from the tool body, and since there is no protruding part on the tip tool holding member attached to the tool body, there is no part that can get caught when working with the impact tool, and work efficiency is improved dramatically. [Effects of the Invention]

[0010] The tip tool holding member according to the present invention has the excellent effect of not interfering with work.

[0011] Furthermore, the impact tool according to the present invention has the excellent effect of being provided with a tip tool holding member that does not get in the way of work. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a partially enlarged perspective view of the impact tool according to the embodiment. [Figure 2]FIG. 1 is a partially enlarged perspective view of an impact tool from which a tip tool holding member according to an embodiment has been removed. [Figure 3] FIG. 1 is a perspective view of a tip tool holding member according to an embodiment. [Figure 4] FIG. 2 is a partially enlarged vertical cross-sectional view of the impact tool according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes in detail an embodiment of the present invention.

[0014] The present invention is not limited to the examples shown below, and design modifications are possible as appropriate.

[0015] As shown in FIG. 1, the impact tool 1 includes a tool body 10, a tip tool 20 held at the tip of the tool body 10, and a tip tool holding member 30 having a coil spring shape for holding the tip tool 20 on the tool body 10.

[0016] As shown in FIG. 2, the outer peripheral surface of the tip of the tool body 10 is provided with a spiral groove portion 11 that is formed in a spiral shape around the axis of the tip tool 20 attached to the tool body 10.

[0017] The tip tool 20 has a locking portion 21 formed on the base end side of the tip end (not shown), which has a larger diameter than other portions.

[0018] 3, the tip tool holding member 30 has an attachment portion 31 on the base end side which is formed by spirally winding a wire rod 40 having a circular cross section and which has a coil spring shape, and a holding portion 32 on the tip end side which has a tapered shape continuing from the tip of the attachment portion 31. An insertion hole portion 35 through which the tip tool is inserted is formed at the tip of the holding portion 32. The insertion hole portion 35 has a shape that prevents the large diameter portion 21 of the tip tool 20 from being inserted therethrough.

[0019] In addition, a portion of the wire rod 40 of the attachment portion 31 on the tip tool side is formed as a spiral convex portion 37. Specifically, in the circular cross section of the wire rod 40, a portion including a curved surface that is on the inside of the attachment portion 31 is formed as the spiral convex portion 37.

[0020] In the impact tool 1, the wire rod 40 of the tip tool holding member 30 elastically deforms relative to the spiral recessed groove portion 11 of the tool body 10, thereby increasing the inner diameter of the mounting portion 31 and crimping the spiral convex portion 37, thereby bringing the impact tool 1 into an mounted state α in which the mounting portion 31 is mounted on the tool body 10, as shown in Figs. 1 and 4. In this mounted state α, the tip tool 20 is inserted into the insertion hole portion 35. At this time, the locking portion 21 of the tip tool 20 is arranged to be housed inside the holding portion 32.

[0021] In addition, in the attached state α, the spiral convex portion 37 at the base end 31a of the attachment portion 31 is also pressed against the spiral concave groove portion 11. That is, the tip tool holding member 30 is made up of only the spirally wound wire rod 40 from the base end 31a of the attachment portion 31 to the insertion hole portion 35 formed at the tip of the holding portion 32, and does not have any portion that protrudes outward. This prevents unintentional removal of the tip tool 20 during work using the impact tool 1, and there is no protruding portion that would cause the tip tool holding member 30 to come into contact with the workpiece, the hand of a worker, the arm of a robot arm, or the like, thereby significantly improving work efficiency.

[0022] In the above embodiment, the dimensions and shapes of each part can be freely selected as appropriate. The impact tool to which the present invention is applicable is not particularly limited to fluid-driven, electric, etc. Furthermore, the impact tool may be used by being held by a worker's hand or by being attached to, for example, a robot arm. [Explanation of symbols]

[0023] 1 Impact tools 10 Tool body 11 Spiral groove 20 Tip Tool 21 Locking portion 30 Tip tool holding member 31 Mounting part 31a proximal end 32 Holding part 35 Insertion hole 37 Spiral convex part 40 wire rod α Wearing state

Claims

1. A tip tool holding member having a coil spring shape formed by spirally winding a wire rod for holding a tip tool on a tool body of an impact tool, a mounting portion to be mounted on the tip end portion of the tool body is disposed on the base end side; a holding portion formed continuously with the tip of the attachment portion is disposed on the tip side; an insertion hole through which the tip tool is inserted is formed at the tip of the holding part, the insertion hole portion has a shape that prevents an engagement portion formed on the tip tool from being inserted therethrough, a portion of the wire rod of the attachment portion on the tip tool side is formed as a spiral convex portion, a spiral concave groove portion formed spirally around the axis of the tip tool on the outer peripheral surface of the tip portion of the tool body, the wire rod of the attachment portion elastically deforms relative to the spiral concave groove portion, thereby increasing the inner diameter of the attachment portion and crimping the spiral convex portion, thereby elastically contacting the attachment portion with the tool body, the tip tool is inserted through the insertion hole portion in an attached state in which the attachment portion is attached to the outer peripheral surface of the tip portion of the tool body, In the attached state, the spiral convex portion at the base end of the attachment portion is also pressed against the spiral concave groove portion. A tip tool holding member characterized by:

2. An impact tool comprising: a tool body; a tip tool held by the tool body; and a tip tool holding member having a coil spring shape formed by spirally winding a wire rod for holding the tip tool on the tool body, The tip tool holding member is a mounting portion to be mounted on the tip end portion of the tool body is disposed on the base end side; a holding portion formed continuously with the tip of the attachment portion is disposed on the tip side; an insertion hole through which the tip tool is inserted is formed at the tip of the holding part, the insertion hole portion has a shape that prevents an engagement portion formed on the tip tool from being inserted therethrough, a portion of the wire rod of the attachment portion on the tip tool side is formed as a spiral convex portion, a spiral concave groove portion formed spirally around the axis of the tip tool on the outer peripheral surface of the tip portion of the tool body, the wire rod of the attachment portion elastically deforms relative to the spiral concave groove portion, thereby increasing the inner diameter of the attachment portion and crimping the spiral convex portion, thereby elastically contacting the attachment portion with the tool body, the tip tool is inserted through the insertion hole portion in an attached state in which the attachment portion is attached to the outer peripheral surface of the tip portion of the tool body, In the attached state, the spiral convex portion at the base end of the attachment portion is also pressed against the spiral concave groove portion. An impact tool characterized by:

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