TWI701115B - Impacting tool head assembling mechanism - Google Patents

Abstract

An impacting tool head assembling mechanism is provided, including: an engaging sleeve, being disposed on a front end of an impacting tool, including a tubular wall and at least one projection, the tubular wall defining an axial direction, the at least one projection being protrudingly and retractably disposed on an inner wall of the tubular wall; an impacting tool head, including a rod body and a flange radially protruding from the rod body, the flange including an inclined surface facing toward the front end and an outermost peripheral edge, a contact position being defined as a position where the inclined surface contact with the at least one projection; wherein as viewed along the axial direction, a distance between the contact position and the outermost peripheral edge is larger than or equal to 0.5mm.

Description

Impact tool head clamping mechanism

The invention relates to an impact tool head clamping mechanism.

Impact tools are widely used in engineering operations, such as building construction or vehicle maintenance. The types of impact tools include power type and manual type. The tool head is usually detachably and replaceably connected to the impact tool, which can be replaced and used according to different operation requirements. For example, Taiwan Patent Publication No. I468268 and M507829 are such types. The conventional impact tool is provided with a set of joints, the tool head is provided with a radial flange, and the set of joints can be blocked by a blocking mechanism (such as a steel ball) on the flange to limit the tool head. Wherein, the radial size of the tool head corresponds to the radial size of the set of joints and can be connected stably. However, under long-term use, the flange is easily deformed due to repeated impacts of the blocking mechanism, thereby causing the flange The radial size becomes larger or the shape changes, and the set of joints cannot be pulled out, causing inconvenience in use.

Therefore, it is necessary to provide a novel and progressive impact tool head clamping mechanism to solve the above-mentioned problems.

The main purpose of the present invention is to provide an impact tool head clamping mechanism, which can prevent the impact tool head from being deformed and difficult to disassemble.

In order to achieve the above object, the present invention provides an impact tool head clamping mechanism, including: a clamping sleeve, which is arranged at a front end of an impact tool, includes a cylinder wall and at least one clamping protrusion, the cylinder wall defines an axial direction, the At least one card protrusion is releasably and retractably protruding on an inner wall surface of the barrel wall; an impact tool head includes a shaft and a card edge protruding radially outward from the shaft, the card edge includes a front end facing The inclined surface and an outermost peripheral edge of the inclined surface define a contact position where the inclined surface contacts the at least one protrusion; wherein, viewed along the axial direction, the distance between the contact position and the outermost peripheral edge is not less than 0.5 mm.

1: Impact tool head clamping mechanism

2: Impact tool

10: Card sleeve

11: Tube wall

111: inner wall

12: Card convex

13: Accept oblique hole

20: Impact tool head

22: card edge

221: Slope

222: outermost edge

223: upper edge

224: lower edge

225: arc concave

23: abutting slope

L: axial

21: Shaft

P: contact position

Figure 1 is a perspective view of a preferred embodiment of the present invention.

Figure 2 is an exploded view of a preferred embodiment of the present invention.

Figure 3 is a partial cross-sectional view of a preferred embodiment of the present invention.

Fig. 4 is a cross-sectional view of end A-A in Fig. 3;

5 and 6 are schematic diagrams of the operation of a preferred embodiment of the present invention.

Figure 7 is a partial enlarged view of Figure 6;

Figure 8 is a partial enlarged view of the impact tool head of a preferred embodiment of the present invention after use.

The following examples are only used to illustrate the possible implementation aspects of the present invention, but they are not intended to limit the scope of protection of the present invention, and are described first.

Please refer to FIGS. 1 to 8, which show a preferred embodiment of the present invention. The impact tool head clamping mechanism 1 of the present invention includes a ferrule 10 and an impact tool head 20.

The ferrule 10 is arranged at a front end of an impact tool 2 and includes a cylinder wall 11 and at least one protrusion 12, the cylinder wall 11 defines an axial direction L, and the at least one protrusion 12 protrudes in a releasable and retractable manner. An inner wall surface 111 of the barrel wall 11; the impact tool head 20 includes a shaft 21 and a card edge 22 projecting radially outward from the shaft 21. The card edge 22 includes an inclined surface 221 facing the front end and a maximum The outer peripheral edge 222 defines a contact position P where the inclined surface 221 contacts the at least one protrusion 12; wherein, viewed along the axial direction L, the distance between the contact position P and the outermost peripheral edge 222 is not less than 0.5 mm; The card edge 22 further includes a turning connection position between the inclined surface 221 and the outermost peripheral edge 222. When the inclined surface 221 abuts the at least one engaging protrusion 12, the at least one engaging protrusion 12 and the turning connection position Keep a gap between. Thereby, the card edge 22 is not easy to interfere with the cylinder wall 11 due to radial deformation, which makes it difficult to disassemble.

In this embodiment, the inclined surface 221 is an inclined plane; the slope of the inclined plane is preferably between 0.5 and 3, so that there is an appropriate distance between the contact position P and the outermost peripheral edge 222. The inclined surface 221 and the at least one protrusion 12 are preferably in point contact, whereby the contact area between the at least one protrusion 12 and the inclined surface 221 is small, which can reduce the amount of deformation caused by impact and allow a larger deformation margin. degree. In other embodiments, the inclined surface may also be an inclined convex surface or an inclined concave surface. In detail, the hardness of the at least one card protrusion 12 (such as HRC60) is greater than the hardness (such as HRC50) of the card edge 22, and has better structural strength to stably block the card edge 22; the at least one card protrusion 12 is a ball , The diameter of the ball is between 6 to 10mm; the inclined surface 221 includes an upper edge 223, and the distance between the upper edge 223 and the outermost peripheral edge 222 is between 1.5 to 5.0mm; the contact position P is between the outermost peripheral edge 222 The distance is between 0.75 and 2.5mm. Thereby, when the impact tool head 20 is impacted outward by force, the ball can contact the inclined surface 221 within a predetermined range, and the deformation of the inclined surface 221 is generated in the predetermined range, which can avoid interference with the barrel wall 11 The doubts are shown in Figure 8. The inclined surface 221 includes a lower end edge 224. The distance between the lower end edge 224 and the contact position P is not greater than 0.75 mm. The lower end edge 224 is preferably separated from the outermost peripheral edge 222 by a distance to prevent the inclined surface 221 from being deformed. The cylinder wall 11 interferes. Viewed along the axis L, the At least one protrusion 12 overlaps with the inclined surface 221 by at least one third, so that the impact tool head 20 can be blocked more firmly, and the contact position P can be farther away from the barrel wall 11 to allow a larger deformation margin. In this embodiment, the ferrule 10 includes a plurality of the engaging protrusions 12 arranged on the inner wall surface 111 at intervals, and the inclined surface 221 is in point contact with each of the engaging protrusions 12 to stably block the impact tool head 20 and Not easy to skew. An arc concave surface 225 is preferably provided between the shaft 21 and the inclined surface 221. The radius of curvature of the arc concave surface 225 is not greater than 5 mm; in this embodiment, the radius of curvature of the arc concave surface 225 is 2.5 mm, thereby enabling The power transmission path is short and efficient.

The ferrule 10 further includes a receiving inclined hole 13 that gradually expands toward the front end, and the impact tool head 20 further includes an abutting inclined surface 23 that can be accommodated in the receiving inclined hole 13, the abutting inclined surface 23 and the receiving inclined The hole wall surface of the hole 13 has complementary shapes, whereby the impact tool head 20 and the hole wall surface of the receiving oblique hole 13 are completely in close contact with each other, so that the force transmission efficiency is high and not easy to be damaged, and the contact area is large and the impact tool 2 can be dispersed In addition, the abutting inclined surface 23 allows the card edge 22 to pass through the at least one protrusion 12 more smoothly during assembly.

1: Impact tool head clamping mechanism

10: Card sleeve

20: Impact tool head

L: axial

Claims (10)

An impact tool head clamping mechanism, comprising: a clamping sleeve, arranged at a front end of an impact tool, comprising a cylinder wall and at least one clamping protrusion, the cylinder wall defines an axial direction, and the at least one clamping protrusion is releasable and retractable Protruding from an inner wall surface of the barrel wall; an impact tool head, including a shaft and a card edge protruding radially outward from the shaft, the card edge including an inclined surface facing the front end and an outermost peripheral edge, The contact position between the inclined surface and the at least one card protrusion defines a contact position; wherein, viewed along the axial direction, the distance between the contact position and the outermost peripheral edge is not less than 0.5 mm; the card edge further includes a contact position between the inclined surface and At the turning connection position between the outermost peripheral edges, when the inclined surface abuts the at least one locking protrusion, a gap is maintained between the at least one locking protrusion and the turning connection position. The impact tool head clamping mechanism according to claim 1, wherein the inclined surface is an inclined plane. The impact tool head clamping mechanism according to claim 2, wherein the slope of the inclined plane is between 0.5 and 3. The impact tool head clamping mechanism according to claim 1, wherein the inclined surface is an inclined convex surface or an inclined concave surface. The impact tool head clamping mechanism according to claim 1, wherein the inclined surface is in point contact with the at least one protrusion; the at least one protrusion is a ball, and the diameter of the ball is between 6mm and 10mm; the inclined surface includes a On the upper edge, the distance between the upper edge and the outermost periphery is between 1.5mm and 5.0mm; the distance between the contact position and the outermost periphery is between 0.75mm and 2.5mm. The impact tool head clamping mechanism according to claim 1, wherein the ferrule further includes a receiving inclined hole gradually expanding toward the front end, and the impact tool head further includes an abutting inclined surface that can be accommodated in the receiving inclined hole , The abutting inclined surface and the hole wall of the receiving inclined hole have complementary shapes. The impact tool head clamping mechanism according to claim 1, wherein an arc concave surface is provided between the shaft and the inclined surface, and the curvature radius of the arc concave surface is not greater than 5 mm. The impact tool head clamping mechanism according to claim 3, wherein the clamping sleeve includes a plurality of the clamping protrusions arranged on the inner wall surface at intervals; the inclined surface is in point contact with each of the clamping protrusions; each of the clamping protrusions is one The diameter of the ball is between 6mm and 10mm; the distance between the contact position and the outermost edge is between 0.75mm and 2.5mm; the inclined surface includes an upper edge, and the distance between the upper edge and the outermost edge is 1.5 mm to 5.0mm; the ferrule further includes a receiving inclined hole that gradually expands toward the front end, the impact tool head also includes an abutting inclined surface that can be accommodated in the receiving inclined hole, the abutting inclined surface and the receiving inclined hole The shape of the hole wall surface is complementary; an arc concave surface is provided between the shaft and the inclined surface, and the radius of curvature of the arc concave surface is not greater than 5mm. The impact tool head clamping mechanism according to any one of claims 1 to 8, wherein viewed along the axial direction, the at least one clamping protrusion overlaps with the inclined surface by at least one third. The impact tool head clamping mechanism according to any one of claims 1 to 8, wherein the inclined surface includes a lower end edge, and the distance from the lower end edge to the contact position is not greater than 0.75 mm.

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