Tip tool for air -type impact tool

Abstract

To provide a tip tool for an air-type impact tool, which is provided with a grip part capable of safe gripping even during an operation of the impact tool.SOLUTION: A tip tool body 20 of a tip tool 1 for an air-type impact tool comprises: a coil spring member 40 close to a tip; and a coil spring member 50 close to a base end. In a use state where an operator grips a grip member 30 to apply impacts to a workpiece W, the coil spring member 40 close to the tip can telescopically move within an elastic deformation range between a pressing part 62 close to the body member side tip and a pressing part 32 closed to the grip member side base end, and the coil spring member 50 close to the base end can telescopically move within the elastic deformation range between the pressing part 62 close to the body member side tip and the pressing part 33 closed to the grip member side base end.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a tip for a pneumatic impact tool that applies impact to a workpiece by the action of a mechanism in which a hammer reciprocates. [Background technology]

[0002] Conventionally, various tip tools have been proposed for attachment to an impact tool body, such as the chisel disclosed in Patent Document 1. Such tip tools for impact tools vibrate violently during operation of the impact tool, and therefore it is dangerous to touch them, for example, by holding them in the hand or placing your hand on them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-15165 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in an actual work site, there are cases where the tip of the tip tool needs to be touched because it needs to be pressed against or rubbed against a specific part of the workpiece. In particular, in a tip tool whose overall length is longer than the impact tool body, the position of the tip of the tip tool is not well determined, and it is necessary to guide the tip to the required position while holding the tip tool with one hand.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a tip tool for a pneumatic impact tool that is equipped with a gripping portion that can be safely gripped even during operation of the impact tool. [Means for solving the problem]

[0006] The present invention relates to a tip tool for a pneumatic impact tool, which is equipped with a tool body, and which includes a cylinder portion and a hammer reciprocating within the cylinder portion, and which is attached to a tip of the pneumatic impact tool that applies an impact to a predetermined workpiece by reciprocating the hammer using compressed air introduced from outside the tool body to generate an impact force and apply an impact to a predetermined workpiece, the tip tool comprising: a long body member having a base end with which the hammer collides and a tip end that abuts against the workpiece; a cylindrical gripping member into which the body member is inserted so as to be axially movable; and a tip-side coil spring member disposed near the tip of the body member and a base-side coil spring member disposed near the base end of the body member by the body member being inserted into the gripping member, the tip-side coil spring member being disposed near the base end of the body member, the tip-side coil spring member being disposed near the base end of the body member, the tip-side coil spring member being disposed near the base end of the body member, and the body member further comprising: the tip end of the tip-nearest coil spring member is pressed against a main body member-side pressure contact portion, and the base end of the base-nearest coil spring member is pressed against a main body member-side pressure contact portion, the gripping member is provided with a gripping member-side pressure contact portion near the tip end with which the base end of the base-nearest coil spring member is pressed against, and a gripping member-side pressure contact portion near the base end with which the tip end of the base-nearest coil spring member is pressed against, and the tip end of the base-nearest coil spring member is pressed against the main body member-side pressure contact portion, and the base-nearest coil spring member is disposed between the main body member-side pressure contact portion near the tip end and the gripping member-side pressure contact portion near the tip end in a state in which it can expand and contract within a range of elastic deformation when an operator grips the gripping member to apply an impact to the workpiece.

[0007] In this configuration, even during the operation of the tip tool for the pneumatic impact tool (hereinafter also simply referred to as the tip tool), the gripping member can be gripped and the work can be continued. In other words, while the main body member is repeatedly subjected to impact force from the hammer, the gripping member has a structure in which vibrations are appropriately absorbed by the coil spring member near the tip end and the coil spring member near the base end, and vibrations are not easily transmitted to the operator's hands. This allows the gripping member to be gripped safely and the tip of the tip tool to be accurately guided and applied to a specific part of the workpiece.

[0008] In addition, a configuration is proposed in which a thread groove is formed on the outer peripheral surface of the main body member, a nut member that screws into the thread groove is attached to the main body member, and an end of the nut member forms at least one of a pressure-contact portion near the tip end of the main body member and a pressure-contact portion near the base end of the main body member.

[0009] With this configuration, the state of elastic deformation of the distal end coil spring member and the proximal end coil spring member can be changed by disposing the nut member at a desired position on the main body member. This makes it possible to adjust the striking force of the tip tool, adjust the vibration absorption force applied to the gripping member, or adjust the vibration frequency, thereby optimizing the strength of the striking force, the level of vibration performance, or noise reduction. Effect of the Invention

[0010] The tip tool for a pneumatic impact tool of the present invention has the excellent effect of being able to be safely held even during operation of the impact tool. [Brief description of the drawings]

[0011] [Figure 1] 1A and 1B are explanatory views showing a state in which the tip tool for a pneumatic impact tool according to an embodiment is used, in which (a) shows a plan view and (b) shows a side view. [Diagram 2] FIG. 2 is a cross-sectional view of the tip tool for a pneumatic impact tool according to the embodiment, showing the inside by cutting away the portion of the gripping member. [Diagram 3] 1A is a plan view of a main body member according to an embodiment, FIG. 1B is a side view seen from the tip end side, and FIG. 1C is a side view seen from the base end side. [Figure 4] 1A and 1B show a gripping member according to an embodiment, in which (a) is a front view partially showing the inside, and (b) is a side view. [Diagram 5] 1A and 1B are a front view and a bottom view of a seat member according to an embodiment of the present invention, respectively, in which FIG. [Figure 6] FIG. 1 is an explanatory diagram showing a state in which the tip tool for a pneumatic impact tool according to an embodiment is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The embodiment of the present invention will be described according to the examples. Note that the present invention is not limited to the examples shown below, and design changes are possible as appropriate. For convenience, the examples are described by specifying the beginning and end, but the present invention is not limited thereto.

[0013] As shown in FIG. 1, a tip tool 1 for a pneumatic impact tool (hereinafter also simply referred to as tip tool 1) is attached to a tool body 11 of a pneumatic impact tool 10.

[0014] The pneumatic impact tool 10 includes a cylinder portion 12 in a tool body 11 and a hammer 13 that reciprocates in the cylinder portion 12. The pneumatic impact tool 10 employs a known mechanism in which the hammer 13 is caused to repeatedly collide with the tip tool 1 by reciprocating the hammer 13 using compressed air introduced from outside the tool body 11.

[0015] The tip tool 1 includes a tip tool body 20, a gripping member 30, a distal coil spring member 40, a proximal coil spring member 50, a pair of seat members 60, 61, and a pair of double nuts 70, 71, each of which is constructed as a separate body. The distal double nut 70 and the proximal double nut 71 each achieve an anti-loosening effect by using two nuts adjacent to each other.

[0016] First, the tip tool body 20 will be described. As shown in Figs. 2 and 3, the tip tool body 20 is made of a long rod material and has a base end 21 with which the hammer 13 strikes, a tip end 22 that comes into contact with the workpiece W, and an intermediate portion 23 that connects the base end 21 and the tip end 22.

[0017] The base end 21 is the part that is inserted into the cylinder portion 12 of the tool body 11 of the air impact tool 10 and is the part against which the hammer 13 collides, and its cross-sectional shape is polygonal (hexagonal) so that it fits snugly into the shape of the mounting hole provided in the cylinder portion 12 so that it cannot rotate freely around the axis when inserted into the cylinder portion 12.

[0018] On the other hand, the tip portion 22 is formed into a flat chisel shape, which allows the material adhering to a specific portion of the workpiece W to be suitably peeled off.

[0019] The intermediate portion 23 is in the form of a round bar, and has a screw groove 23a formed on the entire surface.

[0020] Next, the gripping member 30 will be described. As shown in FIG. 4, the gripping member 30 has a cylindrical shape, and the tip tool main body 20 is inserted into the cylinder.

[0021] A protruding step 31 is formed in the middle of the inner circumferential surface of the gripping member 30, and a step surface on the tip side of the protruding step 31 constitutes a gripping member side pressure contact portion 32 near the tip end. In contrast, a step surface on the base end side of the protruding step 31 constitutes a gripping member side pressure contact portion 33 near the base end.

[0022] Furthermore, an impact reduction portion 35 is formed on the outer peripheral surface of the gripping member 30 and is made of an elastic material such as urethane rubber.

[0023] Next, the arrangement of the two coil spring members 40, 50 will be described. As shown in FIG. 2 , the tip-side coil spring member 40 is disposed around the intermediate portion 23 of the tip tool body 20 by having the tip tool body 20 inserted therein, and is also disposed on the tip side of the gripping member side pressure contact portion 32 of the gripping member 30 near the tip.

[0024] As shown in FIG. 2, the tip tool body 20 is inserted into the base-side coil spring member 50, so that the tip tool body 20 is disposed around the intermediate portion 23 of the tip tool body 20, and the base-side coil spring member 50 is disposed on the base-side relative to the gripping member side pressure contact portion 33.

[0025] Here, as shown in Fig. 2, the distal end coil spring member 40 is disposed in the gap between the outer peripheral surface of the tip tool main body 20 and the inner peripheral surface of the gripping member 30, and is interposed between the distal end seat member 60 and the gripping member side distal end pressure contact portion 32. As shown in Fig. 5, the distal end seat member 60 has a ring shape, and the tip tool main body 20 is inserted into the ring. The distal end seat member 60 is positioned by a double nut 70 screwed to the distal end side of the distal end seat member 60. The distal end seat member 60 on one side (rear side) constitutes the main body member side distal end pressure contact portion 62.

[0026] On the other hand, the base-side coil spring member 50 is disposed in the gap between the outer peripheral surface of the tip tool main body 20 and the inner peripheral surface of the gripping member 30, and is interposed between the gripping member-side base-side pressure contact portion 33 and the base-side seat member 61. Here, the base-side seat member 61 has a structure similar to that of the tip-side seat member 60 (see FIG. 5), and is positioned by a double nut 71 screwed to the base end side of the base-side seat member 61. The other side (front side) end of the base-side seat member 61 constitutes the body member-side base-side pressure contact portion 63. The pair of seat members 60, 61 and the pair of double nuts 70, 71 constitute a nut member according to the present invention, and the tip tool main body 20, the seat members 60, 61, and the double nuts 70, 71 constitute a body member according to the present invention.

[0027] Next, the manner in which the distal end coil spring member 40 and the proximal end coil spring member 50 expand and contract will be described. In such a tip portion 1, in a usage state in which a worker grips the gripping member 30 and applies an impact to the workpiece W, the tip portion of the tip-near coil spring member 40 is in pressure contact with the main member-side tip-near pressure contact portion 62 of the tip-near seat member 60, and the base end portion is in pressure contact with the gripping member-side tip-near pressure contact portion 32 of the gripping member 30, so that the tip-near coil spring member 40 is in a state of being able to expand and contract based on the reciprocating motion of the hammer 13 within a range in which it can be elastically deformed. Similarly, the tip portion of the base-near coil spring member 50 is in pressure contact with the gripping member-side base-near pressure contact portion 33 of the gripping member 30, and the base end portion is in pressure contact with the main member-side base-near pressure contact portion 63 of the base-near seat member 61, so that the base-near coil spring member 50 is in a state of being able to expand and contract based on the reciprocating motion of the hammer 13 within a range in which it can be elastically deformed.

[0028] In other words, when an impact force is applied to the tip tool body 20 from the hammer 13, only the impact force attenuated by the coil spring member 40 near the tip end and the coil spring member 50 near the base end is transmitted to the gripping member 30, and therefore the operator can safely grip the gripping member 30 and operate the tip portion 22 without receiving a strong impact.

[0029] For example, as shown in Fig. 6, when the tip 22 of the tip tool 1 is placed in contact with a deep portion of the workpiece W, the tip tool 1 cannot rotate around its axis relative to the tool body 11, so the tool body 11 is rotated around its axis to determine the direction of the tip 22. At this time, the tip tool 1 can safely grip the gripping member 30, so that the stability is very high, and the work efficiency is remarkably improved compared to the conventional one. In particular, since the tip 22 is a flat chisel-like shape having a direction (directionality) as described above, there is an advantage that, for example, the tool body 11 held in the right hand is rotated to rotate the tip 22 around its axis, while the angle of the left hand gripping the gripping member 30 can be maintained as it is.

[0030] In addition, the position of the seat members 60, 61 can be adjusted by changing the position of the double nuts 70, 71, and the elastic deformation state of the distal coil spring member 40 and the proximal coil spring member 50 in the use state can be changed by adjusting the position of the seat members 60, 61. That is, by further compressing the distal coil spring member 40 and the proximal coil spring member 50, the impact force absorbed by each coil spring member can be reduced and the impact force of the tip tool 1 can be improved. In addition, by further expanding the distal coil spring member 40 and the proximal coil spring member 50, the impact force transmitted to the grip member 30 can be further reduced and the impact force transmitted to the operator's hand can be reduced. Furthermore, the impact sound generated by the tip tool 1 can be mitigated. That is, by adjusting the degree of expansion and contraction of the distal coil spring member 40 and the proximal coil spring member 50, the frequency of the sound generated by the tip tool 1 can be changed to suppress the generation of sounds that seem to be noise.

[0031] In the above embodiment, the dimensions and shapes of each part can be freely selected as appropriate. The gripping member 30 may have a tubular shape other than a cylindrical shape. Furthermore, the distal coil spring member 40 and the proximal coil spring member 50 do not need to be independent, and may be composed of a combination of multiple coil springs. [Explanation of symbols]

[0032] 1 Tips for air-powered impact tools 10 Air impact tool 11 Tool body 12 Cylinder section 13 Hammer 20 Tip tool body 21 Proximal end 22 Tip 23 Middle Section 23a Thread groove 30 Gripping member 31 Convex step part 32 Pressure contact part near the tip of the gripping member 33 Pressure contact portion near the base end of the gripping member 35 Impact reduction section 40 Coil spring member near the tip 50 Coil spring member near base end 60 Tip seat member 61 Base end seat member 62 Pressure welded part near the tip of the main body 63 Pressure welded part near the base end of the main body 70 Double nut near the tip 71 Base end double nut Double work

Claims

1. A tip tool for an air-type impact tool, comprising a tool body, a cylinder portion and a hammer reciprocating within the cylinder portion, the tip tool being attached to a tip of the air-type impact tool that applies an impact to a workpiece by reciprocating the hammer using compressed air introduced from outside the tool body to generate an impact force, the tip tool providing an impact to a predetermined workpiece, An elongated main body member having a base end portion against which the hammer strikes and a tip end portion that contacts the workpiece; A gripping member having a cylindrical shape, the main body member being inserted into the cylindrical shape so as to be movable in the axial direction; a distal end coil spring member disposed near the distal end of the main body member and a proximal end coil spring member disposed near the proximal end of the main body member, the distal end coil spring member being disposed in a gap between an outer peripheral surface of the main body member and an inner peripheral surface of the grip member by inserting the main body member therethrough; Equipped with The body member further comprises: a main body member-side pressure contact portion to which a tip end of the tip end-side coil spring member is pressure-contacted; a main body member-side proximal end pressure contact portion to which a proximal end of the proximal end coil spring member is pressure-contacted; It is equipped with The gripping member is a gripping member-side pressure contact portion near the tip end with which a base end portion of the coil spring member near the tip end is in pressure contact; a gripping member-side proximal end pressure contact portion to which a tip end of the proximal end coil spring member is in pressure contact; It is equipped with In a usage state in which an operator holds the gripping member and applies an impact to the workpiece, the distal end-side coil spring member is disposed between the body member-side distal end-side pressure contact portion and the grip member-side distal end-side pressure contact portion in a state in which the coil spring member can freely expand and contract within an elastic deformation range, The base-side coil spring member is disposed between the base-side pressure contact portion of the main body member and the base-side pressure contact portion of the grip member in a state in which it can expand and contract within an elastic deformation range. A tip for a pneumatic impact tool, characterized in that

2. A thread groove is formed on the outer circumferential surface of the main body member, A nut member that screws into the thread groove is attached to the main body member, An end of the nut member constitutes at least one of the main body member side pressure contact portion near the tip end and the main body member side pressure contact portion near the base end. The tip for a pneumatic impact tool according to claim 1.

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