TWI866851B - Impact tool head assembly structure - Google Patents

Abstract

An impact tool head assembly structure is composed of a power impact tool, a connector and a tool head. The impact tool is provided with an inner tube, which has a chamber in which an impact block that can be driven to move back and forth is provided. The inner tube is provided with a positioning hole at one end thereof, and the positioning hole is in the shape of a hexagonal hole. A assembling portion is formed at one end of the connector, and an extension section and an insertion section are sequentially extended at the other end of the connector. The insertion section is used to be inserted into the positioning hole, and the insertion section has a shape corresponding to the positioning hole, so that the connector and the impact tool can be assembled together and at the same time the connector is restricted from rotating. The tool head is rotatably arranged on the assembling portion, and the tool head has a head, and the head is in the shape of a quadrangular column so that a sleeve tool can be mounted.

Description

Impact tool head assembly structure

The present invention relates to a power impact tool, and more particularly to an impact tool head assembly structure capable of performing removal work on a threaded component that has been tightly stuck in a workpiece.

Common threaded components such as nuts, if locked into a workpiece for a long time and not removed, may be stuck in the workpiece due to rust or thermal expansion and contraction and difficult to remove. At this time, impact hand tools must be used to disassemble the threaded components. The impact hand tools on the market are mainly to first assemble tools such as screwdrivers or sockets at the working end of the impact hand tools, hold the handle of the impact screwdriver with one hand, and then connect the screwdriver or socket to the threaded component, while the other hand uses a hammer to repeatedly strike the end of the handle of the impact screwdriver. The vibration generated by the hammer drives the tool to rotate at a predetermined angle, so that the stuck threaded component can be gradually unscrewed.

However, in actual use, existing impact hand tools must be held in one hand and the hammer must be held in the other hand to perform the striking action. In addition to being time-consuming and labor-intensive to use, the manual striking method is also prone to accidentally hitting the hand, and people are often injured. This problem has existed for a long time, but there is currently no definite solution, and it has become a long-standing problem in this technical field.

In addition, the existing impact hand tools also lack a reasonable assembly mechanism, which makes it impossible to directly install them on a power impact tool (such as a pneumatic impact tool) for use. Although there are many power impact tools on the market, there is no power impact tool that can be specifically used to remove threaded components that are tightly stuck in the workpiece. Therefore, it is necessary to further improve the existing technology to solve the above problems.

The object of the present invention is to provide an impact tool head assembly structure that can perform removal work on a threaded element that has been tightly stuck in a workpiece.

In order to solve the above technical problems, the present invention provides an impact tool head assembly structure, comprising:

A power impact tool has a handle, an inner tube is arranged in the handle, a chamber is formed inside the inner tube, an impact block is arranged in the chamber and can be driven by an external power to move back and forth in the chamber, one end of the inner tube is provided with a hexagonal positioning hole connected to the chamber, so that the positioning hole is non-circular and has six abutment surfaces;

A connecting piece, one end of which is expanded to form a connecting portion, and the other end of the connecting piece is integrally connected to form an extension section and an insertion section in a direction relatively far away from the connecting portion, the connecting portion and the extension section are integrally connected by an annular slope that tapers toward the extension section, and an arc section is formed at the intersection of the annular slope and the extension section, the total length of the extension section and the insertion section is greater than the length of the connecting piece, the connecting piece is inserted into the positioning hole with its insertion section, and the outer periphery of the insertion section forms a hexagonal column corresponding to the positioning hole, thereby restricting the connecting piece from rotating; and

A tool head is rotatably assembled on the assembly part, the tool head has a head portion exposed outside the assembly part, and the head portion is in the shape of a quadrangular column and can be mounted on a sleeve tool, the assembly part is in the shape of an expansion and has an open receiving groove formed inside, and the tool head has a body portion extending in the receiving groove, the assembly part is provided with an annular concave section, and two opposite sides of the annular concave section are divided into A bevel groove is separately provided, and a spring is arranged in the groove. The two ends of the spring respectively abut against the bottom surface of the groove and the body of the tool head to push the tool head relative to each other, and a pin is passed through the bevel groove of the assembly part and is arranged on the body of the tool head, and the two ends of the pin are respectively passed through the bevel grooves on two opposite sides of the assembly part, and then a lining ring is arranged on the annular concave section to cover the bevel groove and the pin.

Preferably, a sleeve is provided at the front end of the inner tube, and when the connector is inserted into the positioning hole with its insertion section, the extension section is inserted into the sleeve, and the sleeve has an abutment portion that can abut against the extension section. In a preferred embodiment, the sleeve extends from the front end of the inner tube to the outside of the handle and is in a hollow tube shape, and the abutment portion is composed of a quick-release connector provided on the sleeve, and the abutment portion has a ring and a plurality of beads located in the ring and can partially extend into the sleeve, and when the connector is inserted into the positioning hole with its insertion section, the extension section is inserted into the sleeve, and the insertion section and the extension section are supported by the positioning hole and the beads of the abutment portion, respectively.

The above-mentioned objects and advantages of the present invention can be more clearly understood from the following detailed description of the embodiments and the accompanying drawings.

As shown in FIGS. 1 to 5, the impact tool head assembly structure provided by the present invention is mainly composed of a power impact tool 11, a connecting member 21 and a tool head 31, wherein:

The power impact tool 11 has a handle 12. In this embodiment, the handle 12 is pistol-shaped, and an inner tube 13 is provided at the top of the handle 12. A chamber 131 is formed inside the inner tube 13. An impact block 14 is provided in the chamber 131 and can be driven by high-pressure air to reciprocate in the chamber 131. Since the operation method of the impact block 14 is a known technology and is not the focus of this case, it will not be described here. The inner tube 13 has a front end 132, and the front end 132 is provided with a positioning hole 15 connected to the chamber 131, and the inner edge of the positioning hole 15 is non-circular and has at least one abutment surface 151. In this embodiment, the positioning hole 15 is a hexagonal hole with six abutment surfaces 151, and the front end 132 of the inner tube 13 is provided with a sleeve 16. In this embodiment, the front end 132 of the inner tube 13 is provided with a sleeve 16. The end 132 is integrally extended to form a hollow tubular sleeve 16 extending out of the handle 12, and an abutment portion 17 composed of a quick-release joint is provided on the outer periphery of the sleeve 16, wherein the abutment portion 17 composed of the quick-release joint has a ring 171, a return spring 172 for pushing the ring, and a plurality of beads 173 arranged in the ring 171 and partially extending into the sleeve 16.

The connecting member 21 has an assembly portion 22 in the shape of an outwardly expanding sleeve formed at one end thereof. The assembly portion 22 has an opening inside thereof. The other end of the connecting member 21 is integrally connected and extends in a direction relatively far from the assembly portion 22 to form an extension section 23 and an insertion section 24 with a smaller outer diameter. The outer diameter ratios of the assembly portion 22, the extension section 23 and the insertion section 24 are approximately 2:1:0.8, respectively, so as to reduce the overall weight of the connecting member 21. It should be noted that the assembly part 22 and the extension section 23 are connected by an annular bevel 222 that tapers toward the extension section 23. The wall thickness between the assembly part 22 and the extension section 23 is increased by the configuration of the annular bevel 222, thereby improving the structural strength and shock resistance of the assembly part 22 and the extension section 23. The intersection of the annular bevel 222 and the extension section 23 forms an arc section 223. The arc end angle design provides a good stress dispersion effect and can avoid fracture due to severe vibration. Between the extension section 23 and the insertion section 24, an annular flange 25 is integrally formed. The connector 21 is inserted into the positioning hole 15 with its insertion section 24, and the extension section 23 is inserted into the sleeve 16. The outer periphery of the insertion section 24 has a shape corresponding to the positioning hole, thereby limiting the connector 21 from radial rotation. In this embodiment, the insertion section 24 is formed by cutting six flat surfaces 242 that match the inner shape of the positioning hole 15 directly on the outer circumference of a round rod 241, so that the insertion section 24 is formed into a hexagonal column shape corresponding to the inner shape of the positioning hole 15, and in order to ensure the stability of the center of gravity of the connector 21 after assembly, the total length L1 of the extension section 23 and the insertion section 24 is greater than the length L2 of the assembly portion 22, and when the connector 21 is inserted into the positioning hole 15 with its insertion section 24, the insertion section 24 and the extension section 23 are respectively supported by the positioning hole 15 and the bead 173 of the abutment portion 17, so as to effectively reduce the insertion of the connector 21. The insertion section 24 and the extension section 23 produce shaking to ensure the accuracy of its transmission. In addition, when the connector 21 is inserted into the positioning hole 15 with its insertion section 24, the end of the insertion section 24 extends into the cavity 131 of the inner tube 13, and the annular flange 25 is relatively abutted against an inner peripheral wall 133 of the inner tube 13 located between the sleeve 16 and the positioning hole 15 with its arc surface 251 facing the side of the positioning hole 15, which has a shape corresponding to the arc surface 251, so as to provide a limiting effect when the connector 21 is reset, and at the same time ensure its straightness after reset, so that the center position of the connector 21 can be aligned with the axis of the cavity 131.

The tool head 31 is rotatably assembled in the receiving groove 221 of the assembly part 22. The tool head 31 has a body 32 extending from the receiving groove 221 and a head 33 exposed outside the receiving groove 221. The head 33 is in the shape of a quadrangular column and can be mounted on a sleeve tool (not shown in the figure). In this embodiment, the assembly part 22 is provided with an annular concave section 26 with a smaller outer diameter, and two opposite sides of the annular concave section 26 are respectively provided with a "V"-shaped inclined groove 27 that is connected to the receiving groove 221, and a spring 28 is provided in the receiving groove 221. The two ends of the spring 28 are respectively used to abut against the bottom surface of the receiving groove 221 and the body 32 of the tool head 31 to push relative to each other. The tool head 31 is abutted against the tool head 31, and a pin 29 is passed through the inclined groove 27 of the assembly part 22 and is set on the body 32 of the tool head 31, and the two ends of the pin 29 are respectively passed through the inclined grooves 27 on the two opposite sides of the assembly part 22, and then a sleeve 34 is arranged on the annular recess section 26 to cover the inclined groove 27 and the pin 29 to prevent the pin 29 from falling out of the inclined groove 27, and the assembly of the present invention can be completed.

When the present invention is actually used, when it is necessary to remove a threaded component (such as a nut) that is difficult to unscrew, the user only needs to first assemble a socket tool of appropriate size on the head 33 of the tool head 31, and then sleeve the socket tool on the threaded component. Then, by pressing the button 18 on the handle 12, high-pressure air can be injected into the chamber 131 of the inner tube 13, thereby pushing the impact block 14 to hit the end of the insertion section 24 of the connector 21 extending into the chamber 131 at high speed. At this time, the radial rotation of the connector 21 is limited by the shape of the insertion section 24 and the positioning hole 15 that cooperate with each other, so that the connector 21 can only move forward in its axial direction, thereby ensuring that its impact force can be fully output. When the connecting member 21 moves forward, the relative compression spring 28 forces the tool head 31 to retract, so that the pin 29 can slide along the inclined groove 27, thereby driving the tool head 31 and the sleeve tool assembled on the tool head 31 to rotate together, and at the same time, the vibration generated by the impact block 14 can be completely transmitted to the threaded element, so that the threaded element tightly stuck on the workpiece can be easily rotated and removed.

The present invention provides a positioning hole 15 connected to the chamber 131 at the front end 132 of the inner tube 13 of the power impact tool 11, and utilizes the abutment surface 151 formed on the inner edge of the positioning hole 15 for the insertion section 24 of the connector 21 to be correspondingly inserted, thereby allowing the connector 21 to be directly assembled on the power impact tool 11 for use without significantly changing the internal structure of the power impact tool 11; furthermore, since the outer diameter of the assembly portion 22 is larger than the extension section 23 and the insertion section 24, and the weight of the assembly portion 22 after the tool head 31 is installed is also heavier, in order to ensure the stability of the center of gravity of the connector 21 after assembly, the extension section 23 is The total length L1 after adding the insertion section 24 is greater than the length L2 of the assembly portion 22, so that when the insertion section 24 and the extension section 23 of the connecting member 21 are simultaneously inserted into the inner part of the inner tube 13, they can be respectively supported by the positioning hole 15 and the bead 173 of the abutment portion 17, and the annular bevel 222 and the arc section 223 integrally connected between the assembly portion 22 and the extension section 23 can provide additional good stress dispersion effect, which can not only effectively reduce the shaking generated during impact and ensure its transmission reliability, but also, through the present invention, it is driven by a power-type impact tool 11, so it can provide high force output and extremely high work efficiency.

In addition, the present invention uses external power, such as high-pressure air in the present embodiment, to drive the impact block 14 to automatically perform the striking action. Therefore, it can not only avoid the physical exertion of striking with a hand-held hammer, but also effectively solve the accidental injury to the hand that is easy to be accidentally hit by manual striking, and is very practical.

However, the disclosure of the above embodiments is only used to illustrate the present invention, not to limit the present invention. Any replacement of equivalent elements should still fall within the scope of the present invention.

In summary, those familiar with the art can understand that the present invention can achieve the aforementioned purpose and is in compliance with the provisions of the Patent Law, and therefore an application is filed in accordance with the law.

11: Power impact tool 12: Handle 13: Inner tube 131: Chamber 132: Front end 133: Inner wall 14: Impact block 15: Positioning hole 151: Card surface 16: Sleeve 17: Abutment 171: Ring 18: Button 172: Return spring 173: Bead 21: Connector 22: Assembly 221: Receiving groove 222: Ring bevel 223: Circular arc section 23: Extension section 24: Insertion section 241: Round rod 242: Plane 25: Ring flange 251: Arc surface 26: Ring concave section 27: Slot 28: Spring 29: Pin L1: Total length L2: Length 31: Tool head 32: Body 33: Head 34: Bushing

Figure 1 is a schematic diagram of the decomposition of the present invention. Figure 2 is a schematic diagram of the assembly of the present invention. Figure 3 is a three-dimensional schematic diagram of the present invention after assembly. Figure 4 is a cross-sectional view of the present invention after assembly. Figure 5 is a partial enlarged schematic diagram of Figure 4.

11: Power impact tool

12: Handle

13: Internal pipe fittings

131: Chamber

132:Front end

14: Impact block

15: Positioning hole

151: Card surface

16: Socket

17: Butt joint

171: Ring

172:Reset spring

173: Pearl

18: Button

21: Connectors

22: Assembly and connection part

23: Extension section

24: Insert segment

241: Round rod

242: Plane

25: Ring flange

26: Annular concave section

27: Chute

29: Sales

31: Tool head

33: Head

34: lining

Claims (5)

An impact tool head assembly structure includes: A power impact tool, having a handle, an inner tube member disposed in the handle, a chamber formed inside the inner tube member, an impact block that can be driven by an external power to reciprocate in the chamber, one end of the inner tube member is provided with a hexagonal positioning hole that is connected to the chamber, so that the positioning hole is non-circular and has six abutment surfaces; A connecting piece, one end of which is expanded to form a connecting part, and the other end of the connecting piece is integrally connected to form an extension section and an insertion section in a direction relatively far away from the connecting part, the connecting part and the extension section are integrally connected by an annular slope that tapers toward the extension section, and an arc section is formed at the intersection of the annular slope and the extension section, the total length of the extension section and the insertion section is greater than the length of the connecting part, the connecting piece is inserted into the positioning hole with its insertion section, and the outer periphery of the insertion section forms a hexagonal column corresponding to the positioning hole, thereby restricting the connecting piece from rotating; and A tool head is rotatably assembled on the assembly part, the tool head has a head portion exposed outside the assembly part, and the head portion is in the shape of a quadrangular column and can be mounted on a sleeve tool, the assembly part is in the shape of an expansion and has an open receiving groove formed inside, and the tool head has a body portion extending in the receiving groove, the assembly part is provided with an annular concave section, and two opposite sides of the annular concave section are divided into A bevel groove is provided, and a spring is provided in the groove. The two ends of the spring respectively abut against the bottom surface of the groove and the body of the tool head to push the tool head relative to each other. A pin is passed through the bevel groove of the assembly part and is provided on the body of the tool head. The two ends of the pin are respectively passed through the bevel grooves on the two opposite sides of the assembly part. A sleeve ring is then provided on the annular concave section to cover the bevel groove and the pin. As described in claim 1, the impact tool head assembly structure, wherein a sleeve is provided at the front end of the inner tube, and when the connecting part is inserted into the positioning hole with its insertion section, the extension section is inserted into the sleeve, and the sleeve has an abutment portion that can abut against the extension section. An impact tool head assembly structure as described in claim 2, wherein the sleeve extends integrally from the front end of the inner tube to the outside of the handle and is in the shape of a hollow tube, and the abutment portion is composed of a quick-release connector provided on the sleeve, the abutment portion has a ring and a plurality of beads located in the ring and partially extending into the sleeve, and when the connector is inserted into the positioning hole with its insertion section, the extension section is inserted into the sleeve, and the insertion section and the extension section are respectively supported by the positioning hole and the beads of the abutment portion. An impact tool head assembly structure as described in claim 1, wherein an annular flange is integrally formed between the extension section and the insertion section, and when the connector is inserted into the positioning hole with its insertion section, the distal end of the insertion section extends into the chamber of the inner tube, and the annular flange is relatively abutted against an inner circumferential wall of the inner tube. An impact tool head assembly structure as described in claim 1, wherein the inclined grooves on two opposite sides of the assembly portion are V-shaped.

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