Structure of a percussion tool head assembly

Abstract

A structure of a percussion tool head assembly comprising a driven percussion tool (11), a connecting piece (21) and a tool head (31), wherein the percussion tool is provided with an inner tube element (13) and the inner tube element has a chamber (131) and the chamber is provided with a percussion block (14) which can be driven, and wherein the inner tube element is provided at one end with a hexagonal, perforated positioning hole (15) and a mounting part (22) is located at one end of the connecting piece, wherein the tool head is rotatably installed in the mounting part, and the other end of the connecting piece successively forms an extension section (23) and an insertion part (24), wherein the insertion part serves to be snapped into the positioning hole in order to assemble the connecting piece and the percussion tool while preventing rotation of the connecting piece.

Description

Technical field

[0001] The present invention relates to power-driven impact tools and in particular to a structure of an impact tool head arrangement that can perform disassembly work on threaded components that are firmly embedded in a workpiece. State of the art

[0002] If common threaded components such as nuts are not removed after being fixed in the workpiece for an extended period, they can become firmly stuck due to rust or thermal expansion and contraction, making removal difficult. In such cases, disassembly must be carried out using impact tools. With commercially available impact tools designed for removing threaded components, the main method involves first attaching a screwdriver or socket to the working end of the impact tool, holding the handle of the impact tool firmly with one hand, then connecting the screwdriver or socket to the threaded part and repeatedly striking the end of the impact tool handle with a hammer in the other hand.so that the vibration generated by the hammering drives the tool into a rotation through a predetermined angle, gradually loosening the stuck threaded part.

[0003] In actual use, however, conventional striking tools must be held with one hand while the hammer is held with the other hand to perform the striking action. This is not only quite time-consuming and tedious, but manual hammering also makes it easy to accidentally hit your hand, often resulting in injuries. This has been a long-standing problem for which there is still no reliable solution, thus becoming a long-standing issue in this technical field.

[0004] Although there are, as disclosed for example in DE 20 2018 103 297 U1, impact tools which can be installed directly onto power-driven impact tools, and impact tools themselves are also known, such as the one proposed in DE 23 51 242 A1, there is no power-driven impact tool that can remove threaded parts firmly embedded in the workpiece, so it is necessary to further improve the existing technology to solve the problems mentioned above. Brief summary of the invention

[0005] The objective of the present invention is to provide a structure of a percussion tool head arrangement that can perform disassembly work on a threaded element that is firmly embedded in a workpiece.

[0006] To solve the aforementioned technical problems, the present invention provides a structure for a percussion tool head arrangement comprising the following: a powered striking tool having a handle, wherein an inner tube element is attached in the handle, and wherein inside the inner tube element is a chamber, the chamber being equipped with a striking block which can be driven by an external force to move back and forth in the chamber, wherein one end of the inner tube element is provided with a hexagonal, perforated positioning hole connected to the chamber such that the positioning hole is not circular and has six detent surfaces; a connector, wherein one end is extended outwards to form a mounting part and the other end of the connector is integrally connected and successively extends away from the mounting part in one direction to form an extension section and an insertion part with a smaller outer diameter; wherein the mounting part and the extension section are integrally connected by an annular chamfer tapering towards the extension section, the intersection of the annular chamfer and the extension section forming an arc segment, the total length of the extension section and the insertion part being greater than the length of the mounting part, the connector being inserted into the positioning hole with its insertion part, the outer circumference of the insertion part forming a hexagonal column corresponding to the positioning hole, thereby preventing rotation of the connector; a tool head rotatably mounted on the mounting part, wherein the head of the tool head projects from the mounting part and has the shape of a square column so that a socket wrench can be placed on it, wherein the mounting part has an outwardly expanding shape and an open receiving groove is located in its interior, and wherein the tool head has a body that extends into the receiving groove, wherein the mounting part is provided with an annular concave section, and an inclined groove is provided on each of the two opposite sides of the annular concave section, wherein a spring is located in the receiving groove and the two ends of the spring are each in contact with the bottom surface of the receiving groove and the body of the tool head in order to press against the tool head, wherein a pin is inserted through the inclined groove of the mounting part into the body of the tool head.and wherein the two ends of the pin are each inserted into the inclined grooves on the two opposite sides of the mounting part and a sleeve is then fitted to the annular concave section to cover the inclined grooves and the pin.

[0007] Preferably, the front end of the inner tube element is provided with a socket, wherein, when the connecting piece with its insertion part is inserted into the positioning hole, the extension section is inserted into the socket, and wherein the socket has a contact part that can contact the extension section relative to it.In a preferred embodiment, the bushing is formed by the front end of the inner tube element, which extends integrally outside the handle and has the form of a hollow tube, and the contact part consists of a quick-release joint attached to the bushing, wherein the contact part has a collar and several beads are attached in the collar which extend partially into the bushing, and wherein, when the connector with its insertion part is inserted into the positioning hole, the insertion part and the extension section are each supported by the positioning hole and the beads of the contact section. Brief description of the illustrations Fig. is a schematic exploded view of the present invention. Fig. This is an assembly diagram of the present invention. Fig. Figure 1 is a schematic three-dimensional view of the present invention after assembly. Fig. is a cross-sectional view of the present invention after assembly. Fig. is a partially enlarged schematic diagram of Fig. . Detailed description of preferred embodiments

[0008] As in the Fig. , Fig. , Fig. , Fig. until Fig. As shown, the structure of a percussion tool head arrangement provided by the present invention consists mainly of a driven percussion tool 11, a connecting piece 21 and a tool head 31, wherein: The driven striking tool 11 has a handle 12, wherein in this embodiment the handle 12 is pistol-shaped and an inner tube element 13 is provided on the top of the handle 12, wherein a chamber 131 is formed inside the inner tube element 13, the chamber 131 being provided with a striking block 14 which can be driven by high-pressure air to move back and forth in the chamber 131, and since the operation of the striking block 14 is a common technology that is not the focus of this case, it will not be discussed in detail here. The inner tube element 13 has a front end 132, wherein the front end 132 is provided with a positioning hole 15 which is connected to the chamber 131, wherein the inner edge of the positioning hole 15 is not circular and has at least one detent surface 151.wherein in this embodiment the positioning hole 15 has the form of a hexagonal hole and has six detent surfaces 151, wherein the front end 132 of the inner tube element 13 is provided with a bushing 16, wherein in this embodiment the front end 132 of the inner tube element 13 is integrally extended to form a bushing 16 which extends from the handle 12 and has the form of a hollow tube, and wherein a contact part 17 is located on the outer circumference of the bushing 16, which consists of a quick-release connector, wherein the contact part 17, which consists of a quick-release connector, has a collar 171, a return spring 172 for pressing against the collar, and several beads 173 which are located in the collar 171 and extend partially into the bushing 16. At one end of the connecting piece 21, a mounting part 22 is formed, which has the form of an outwardly expanding sleeve, wherein the mounting part 22 has an open receiving groove 221 on the inside, and the other end of the connecting piece 21 is integrally connected and extends successively in one direction away from the mounting part to form an extension section 23 and an insertion part 24 with a smaller outer diameter, wherein the ratio of the outer diameters of the mounting part 22, the extension section 23 and the insertion part 24 is approximately 2:1:0.8 in order to reduce the overall weight of the connecting piece 21, wherein it should be noted that the mounting part 22 and the extension section 23 are integrally connected by an annular chamfer 222 which tapers towards the extension section 23, wherein the annular chamfer 222 increases the wall thickness between the mounting part 22 and the extension section 23.This improves their structural strength and impact resistance, and an arc segment 223 is formed at the intersection of the annular chamfer 222 and the extension section 23, the design of the arc end angle ensuring good stress distribution and preventing fractures due to strong vibrations. An annular flange 25 is integrally widened between the extension section 23 and the insert 24. The connector 21 is inserted into the positioning hole 15 with its insert 24, and the extension section 23 is inserted into the bushing 16, the outer circumference of the insert 24 having a shape corresponding to the positioning hole, thus preventing radial rotation of the connector 21. In this embodiment, the insert 24 is formed by directly cutting the outer circumference of a round bar 241 to form six flat surfaces 242.which correspond to the shape of the inner edge of the positioning hole 15, such that the insert part 24 has a hexagonal column shape corresponding to the inner edge shape of the positioning hole 15, wherein, in order to ensure the stability of the center of gravity after assembly of the connector 21, the total length L1 of the extension section 23 and the insert part 24 is greater than the length L2 of the mounting part 22, and when the connector 21 is inserted into the positioning hole 15, the insert part 24 and the extension section 23 are each supported by the positioning hole 15 and the beads 173 of the contact part 17, in order to effectively reduce the vibration of the insert part 24 and the extension section 23 of the connector 21 and to ensure the reliability of the transmission, wherein furthermore, when the connector 21 with its insert part 24 is inserted relatively into the positioning hole 15,The end of the insertion part 24 extends into the chamber 131 of the inner tube element 13, with the annular flange 25 bearing against the inner tube element 13 on the side facing the positioning hole 15 with its arcuate surface 251, specifically against the inner circumferential wall 133 between the bushing 16 and the positioning hole 15, which corresponds to the shape of the arcuate surface 251, thereby providing a limiting function when the connecting piece 21 is reset, while simultaneously ensuring straightness after reset so that the central position of the connecting piece 21 can be aligned with the axis of the chamber 131. The tool head 31 is rotatably mounted in the receiving groove 221 of the mounting part 22, the tool head 31 having a body 32 extending into the receiving groove 221 and a head 33 exposed outside the receiving groove 221, and the head 33 having the shape of a square column and being able to be encased with a cylindrical tool (not shown in the figure). In this embodiment, the mounting part 22 is provided with an annular concave section 26 having a smaller outer diameter, the two opposite sides of the annular concave section 26 each having V-shaped inclined grooves 27 that communicate with the receiving groove 221, a spring 28 being provided in the receiving groove 221, and the two ends of the spring 28 being used to contact the bottom surface of the receiving groove 221 and the body 32 of the tool head 31 respectively, in order to press the tool head 31 relative to the receiving groove 221.wherein a pin 29 is inserted through the inclined groove 27 of the mounting part 22 into the body 32 of the tool head 31, wherein the two ends of the pin 29 are each inserted into the inclined grooves 27 on the two opposite sides of the mounting part 22, and then a sleeve 34 is arranged on the annular concave section 26 to cover the inclined grooves 27 and the pin 29 and to prevent the pin 29 from falling out of the inclined grooves 27, thereby completing the assembly of the present invention.

[0009] When using the present invention, if it is necessary to remove threaded parts that are difficult to loosen (e.g., nuts), the user simply needs to first mount a socket wrench of a suitable size onto the head 33 of the tool head 31, then place the socket wrench onto the threaded part, and then press the button 18 on the handle 12 so that high-pressure air is filled into the chamber 131 of the inner tube element 13 and the impact block 14 is pushed forward so that it strikes the end of the insertion part 24 of the connector 21 projecting into the chamber 131 at high speed, whereby at this moment the radial rotation of the connector 21 is restricted by the shape of the insertion part 24 and the positioning hole 15, so that the connector 21 can only move forward in its axial direction, thereby allowing the impact force to be fully transferred.When the connecting piece 21 moves forward, the spring 28 is compressed relatively to force the tool head 31 to retract, allowing the pin 29 to slide along the inclined groove 27, thereby driving the tool head 31 and the socket wrench mounted on the tool head 31 to rotate together, and at the same time allowing the vibration generated by the impact block 14 to be fully transmitted to the threaded component, so that the threaded component, which is firmly attached to the workpiece, can be easily turned and removed.

[0010] In the present invention, the front end 132 of the inner tube element 13 of the driven impact tool 11 is provided with a positioning hole 15 which is connected to the chamber 131, and the snap-in surface 151 formed by the inner edge of the positioning hole 15 serves to insert the plug-in part 24 of the connecting piece 21, whereby the connecting piece 21 can be mounted for use directly on the driven impact tool 11 without substantially altering the internal mechanism of the driven impact tool 11; since, moreover, the outer diameter of the mounting part 22 is larger than that of the extension section 23 and the plug-in part 24, and the weight of the mounting part 22 is also higher when the tool head 31 is installed, it is therefore necessary to ensure the stability of the center of gravity after mounting the connecting piece 21,The total length L1 of the extension section 23 and the insertion part 24 is greater than the length L2 of the assembly section 22, so that when the insertion part 24 and the extension section 23 of the connector 21 are simultaneously inserted into the inner tube element 13, they can be contacted and supported by the positioning hole 15 and the beads 173 of the contact section 17, respectively, and wherein the annular chamfer 222 and the arc section 223, which are integrally connected between the assembly part 22 and the extension section 23, can additionally ensure good stress distribution, which not only effectively reduces the vibrations caused by the impacts and ensures the reliability of the transmission, but, since the present invention is driven by a driven impact tool 11, ensures high power output and extremely high work efficiency.

[0011] Furthermore, the present invention uses external energy, such as high-pressure air in this embodiment, to drive the striking block 14 and to perform the tapping process automatically, thereby not only eliminating the physical effort of tapping with a hand hammer, but also effectively avoiding accidental injuries caused by manual tapping, which can easily lead to accidental blows to the hand, which is very practical.

Claims

[1] A structure of a percussion tool head assembly comprising the following: a power-operated striking tool (11) having a handle (12), wherein the handle (12) is provided with an inner tube element (13) and a chamber (131) is formed inside the inner tube element (13) and a striking block (14) is provided in the chamber (131) which can be driven by an external force to move back and forth in the chamber (131), wherein one end of the inner tube element (13) is provided with a hexagonal, perforated positioning hole (15) which is connected to the chamber (131) such that the positioning hole (15) has a non-circular shape and has six detent surfaces (151); a connecting piece (21) which widens outwards at one end to form a mounting part (22), wherein the other end of the connecting piece (21) is integrally connected and extends successively in one direction away from the mounting part (22) to form an extension section (23) and an insertion part (24) with a smaller outer diameter, wherein the mounting part (22) and the extension section (23) are integrally connected by an annular chamfer (222) which tapers towards the extension section (23), wherein the intersection of the annular chamfer (222) and the extension section (23) forms an arc segment (223), wherein the total length (L1) of the extension section (23) and the insertion part (24) is greater than the length (L2) of the mounting part (22), wherein the connecting piece (21) with its insertion part (24) is inserted into the positioning hole (15), wherein the outer circumference of the insertion part (24) forms a hexagonal column,which corresponds to the positioning hole (15), thereby preventing rotation of the connecting piece (21); , a tool head (31) rotatably mounted on the mounting part (22), wherein the head (33) of the tool head (31) projects from the mounting part (22) and has the shape of a square column so that a socket wrench can be placed on it, wherein the mounting part (22) has an outwardly expanding shape and has an open receiving groove (221) in its interior, and wherein the tool head (31) has a body (32) extending into the receiving groove (221), wherein the mounting part (22) is provided with an annular concave section (26), and an inclined groove (27) is provided on each of the two opposite sides of the annular concave section (26), wherein a spring (28) is located in the receiving groove (221) and the two ends of the spring (28) are each in contact with the bottom surface of the receiving groove (221) and the body (32) of the tool head (31) to act against the tool head (31) to pressand wherein a pin (29) is inserted through the inclined groove (27) of the mounting part (22) into the body of the tool head (31), and wherein the two ends of the pin (29) are each inserted into the inclined grooves (27) on the two opposite sides of the mounting part (22), and subsequently a sleeve (34) is attached to the annular concave section (26) to cover the inclined grooves (27) and the pin (29). [2] The structure of a percussion tool head arrangement according to claim 1, wherein a bushing (16) is provided at the front end of the inner tube element (13) such that when the connecting piece (21) with its insertion part (24) is inserted into the positioning hole (15), the extension section (23) passes through the bushing (16) and the bushing (16) has a contact part (17) that can bear relative to the extension section (23). [3] The structure of a striking tool head assembly according to claim 2, wherein the bushing (16) extends integrally from the front end of the inner tube element (13) outside the handle (12) and has the form of a hollow tube, wherein the contact part (17) consists of a quick-release joint provided on the bushing (16) and the contact part (17) has a collar (171) and several beads (173) arranged in the collar (171) and extending partially into the bushing, and wherein, when the connecting piece (21) with its insertion part (24) is inserted into the positioning hole (15), the insertion part (24) and the extension section (23) are each supported by the positioning hole (15) and the beads (173) of the contact section (17). [4] The structure of a percussion tool head arrangement according to claim 1, wherein an annular flange (25) is integrally formed between the extension section (23) and the insertion part (24), and wherein, when the insertion part (24) of the connecting piece (21) is inserted into the positioning hole (15), the end of the insertion part (24) projects into the chamber (131) of the inner tube element (13) and the annular flange (25) is in relative contact with an inner circumferential wall (133) of the inner tube element (13). [5] The structure of a percussion tool head arrangement according to claim 1, wherein the inclined grooves (27) on the two opposite sides of the mounting part (22) are V-shaped.

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