Power tool

Abstract

Power tool, characterized in that it comprises: a housing (100) for defining a cavity (101) arranged therein, wherein at least a part of the cavity (101) extends in the axial direction (AA); a percussion hammer assembly (200) inserted into the cavity (101) and configured for reciprocating movement in the axial direction (AA); a striker pin assembly (300) inserted into the cavity (101) and located near the striker hammer assembly (200); an electric motor for delivering driving power to the impact hammer assembly (200); and a tool head connected to the striker pin assembly (300) and extending outside the housing (100); wherein an axial recess (211) which is concave in the axial direction (AA) is arranged at one end of the impact hammer arrangement (200) near the striking pin arrangement (300), wherein a first raised portion is formed on the inner wall of the axial recess (211), wherein a second raised portion (322) which is annular is arranged at one end of the striking pin arrangement (300) near the impact hammer arrangement (200), wherein the first elevation portion and the second elevation portion (322) are dimensioned to mate with each other so that the hammer assembly (200) and the striker pin assembly (300) can be selectively locked together.

Description

FIELD OF THE INVENTION

[0001] The present application relates to the field of power tool structures. More specifically, the present application relates to a power tool and aims to reduce the size of the power tool and increase operating efficiency. STATE OF THE ART

[0002] Power tools such as electric hammers or impact hammers typically feature reciprocating impact hammers and strikers. The impact hammer and striker must be connected during operation to transmit the driving force. Suitable locking structures allow the impact hammer and striker to be selectively connected and / or separated. Such a connecting and / or separating structure means that both the impact hammer and striker are movable and have a mechanical connecting and / or separating structure. Therefore, the design of electric hammers and impact hammers requires a certain amount of movement for the components. Therefore, specific component sizes are required, and high demands are placed on component quality and workmanship. DISCLOSURE OF THE INVENTION

[0003] The purpose of the present application is, in one aspect, to provide a power tool in which improvements in structure and space requirements can be provided.

[0004] The objectives of the present application are met by the following technical solutions: a power tool comprising: a housing for defining an internally disposed cavity, at least a portion of the cavity extending in the axial direction; a percussion hammer assembly inserted into the cavity and configured for reciprocating movement in the axial direction; a firing pin assembly inserted into the cavity and located proximate to the hammer assembly; an electric motor for delivering driving power to the impact hammer assembly; and a tool head connected to the firing pin assembly and extending outside the housing; wherein an axial recess, which is concave in the axial direction, is arranged at one end of the striking hammer assembly near the striking pin assembly, wherein a first raised portion is formed on the inner wall of the axial recess, wherein a second raised portion, which is annular, is arranged at one end of the striking pin assembly near the striking hammer assembly, wherein the first raised portion and the second raised portion are dimensioned such that they adapt to one another so that the striking hammer assembly and the striking pin assembly can be selectively locked together. DESCRIPTION OF THE CHARACTERS

[0005] The present application will be described in more detail below with reference to the figures and preferred embodiments. Those skilled in the art will understand that the figures are prepared only to illustrate the preferred embodiments and are therefore not to be construed as limiting the scope of the present application. Furthermore, unless otherwise noted, the figures are to be understood only as conceptual representations of the composition or construction of the described objects and may contain exaggerated representations. Furthermore, the figures are not necessarily drawn to scale. Fig. 1 is a schematic cross-sectional view of an embodiment of a power tool according to the present application in a first state. Fig. 2 is a schematic representation of the cross section of the Fig. 1 illustrated embodiment in a second state. Fig. 3 is a schematic cross-sectional view of another embodiment of the present application in a first state. Fig. 4 is a schematic representation of the cross section of the Fig. 3 illustrated embodiment in a second state. Fig. 5 is another view of a power tool according to the Fig. 1 illustrated embodiment. Fig. 6 is a schematic cross-sectional view of another embodiment of the present application. Fig. 7 is a schematic representation of a cross section of another embodiment according to the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0006] Preferred embodiments of the present application are described in more detail below with reference to the figures. Those skilled in the art will understand that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the present application.

[0007] First, it should be noted that the terms "upper part," "lower part," "upward," "downward," and other orientation terms mentioned herein are defined with reference to the directions in the figures. These orientations are relative and therefore vary depending on the position and condition in which they are located. Therefore, these or other orientation terms should not be construed as limiting.

[0008] It should further be noted that for each individual technical feature described or implied in the embodiments of this document, or each individual technical feature shown or implied in the figures, these technical features (or their equivalents) may be further combined to obtain other embodiments not directly mentioned in this document.

[0009] It should be noted that in the various figures the same reference numerals designate the same or substantially the same components.

[0010] Fig. 1 and Fig. 2 show the operation of an embodiment of a power tool according to the present application. For reasons of clarity, Fig. 1 and Fig. 2, only a portion of the components of the power tool is shown. The power tool may be of any suitable type, for example, a shock hammer or an electric hammer or the like. In such power tools, a portion of the components within the power tool are reciprocated to periodically discharge shocks or energy to the outside. The power tool may comprise a housing 100, and the interior of the housing 100 comprises a cavity 101. In Fig. 1 and Fig. 2, the cavity 101 is shown extending approximately in the axial direction AA.

[0011] A percussion hammer assembly 200 and a striker assembly 300 may be inserted inside the cavity 101. In one embodiment, the percussion hammer assembly 200 and / or the striker assembly 300 may be disposed adjacent the inner surface of the housing 100. In one embodiment, the percussion hammer assembly 200 and / or the striker assembly 300 may be configured for reciprocating movement in the axial direction AA. The striker assembly 300 may be positioned proximate the percussion hammer assembly 200. In addition, the power tool may further include an electric motor (not shown) and a tool head (not shown). The driving force may be delivered to the percussion hammer assembly 200 via the electric motor, and the tool head may be directly or indirectly coupled to the striker assembly 300. In one embodiment, the tool head may extend outside the housing 100.

[0012] The impact hammer assembly 200 may include an impact hammer body 210, an inner liner 220, a fourth O-ring 240, and the like. The inner liner 220 may be plugged into the inner wall of the housing 100, providing a movement space for the impact hammer body 210. The impact hammer body 210 may be plugged inside the inner liner 220, and the fourth O-ring 240 may be plugged onto the impact hammer body 210 and extend around the impact hammer body 210. In one embodiment, the impact hammer body 210 may extend approximately in the axial direction AA, and the fourth O-ring 240 may have approximately the axial direction AA as its axis of symmetry.

[0013] A portion of the percussion hammer body 210 may include an axial recess 211. The axial recess 211 may be a recess recessed into the interior of the percussion hammer body 210 in the axial direction AA. A first raised portion may be formed on the inner wall of the axial recess 211. In one embodiment, the first raised portion may be formed by a first O-ring 230. For example, the first O-ring 230 may be disposed in a recess on the side wall of the axial recess 211 such that at least a portion of the first O-ring 230 protrudes from the side wall of the axial recess 211 to form the first raised portion.

[0014] The firing pin assembly 300 may include a firing pin body 310, a guide sleeve 320, a detent spring 330, and the like. The firing pin body 310 may have an elongated portion 311 and a ramp portion 313, and the elongated portion 311 may be oriented to extend approximately in the axial direction AA. As shown in the figure, at least a portion of the elongated portion 311 may extend into the axial recess 211. At least a portion of the elongated portion 311 may movably extend into the axial recess 211.

[0015] The guide sleeve 320 may be fitted onto the elongated portion 311, and the guide sleeve 320 may be movably fitted onto the elongated portion 311.

[0016] The guide sleeve 320 may include a second raised portion 322 and a first locking portion 321. In one embodiment, the second raised portion 322 and the first locking portion 321 may each be disposed at both ends of the guide sleeve 320. In one embodiment, the second raised portion 322 may be disposed closer to the axial recess 211 than the first locking portion 321. The second raised portion 322 may be a portion protruding from the outer surface of the guide sleeve 320, and the second raised portion 322 may be configured to mate with the first raised portion or the first O-ring 230 described in detail above.In one embodiment, the first raised portion or the first O-ring 230 can be dimensioned to match the second raised portion 322 so that the percussive hammer assembly 200 and the striker assembly 300 can be selectively locked together or selectively separated from each other. In one embodiment, the first O-ring 230 is arranged in a recess on the inner wall of the housing 100. In one embodiment, the guide sleeve 320 is fixed relative to the housing 100 by means of the first O-ring 230. In one embodiment, the striker body 310 is movable relative to the guide sleeve 320 and can be movable in the axial direction AA.

[0017] In one embodiment, a first step portion 110 is formed on the inner wall of the housing 100. The first locking portion 321 can be adapted to the first step portion 110, for example, abutting the first step portion 110. In this way, the movement limit position of the guide sleeve 320 in the axial direction AA can be limited by the first step portion 110.

[0018] In one embodiment, the detent spring 330 can be inserted on the outer circumference of the first detent portion 321, for example, between the first detent portion 321 and the inner wall of the housing 100. Furthermore, the guide sleeve 320 can also have a second detent portion 323, wherein the second detent portion 323 can be arranged at the end of the guide sleeve 320, and the first detent portion 321 can be arranged between the second detent portion 323 and the second raised portion 322. The second detent portion 323 can be configured to mate with the ramp portion 313 of the striker body 310 to assist in positioning the guide sleeve 320.

[0019] In the Fig. 1, the second locking portion 323 is in contact with the ramp portion 313 and the first locking portion 321 is in contact with the first step portion 110, and the first raised portion or the first O-ring 230 is separated from the second raised portion 322. In this case, the impact hammer assembly 200 is freely movable and does not transmit any driving force or energy to the impact pin assembly 300. In the state shown in Fig. In the second state shown in Figure 2, the second locking portion 323 is separated from the ramp portion 313 and the first locking portion 321 is separated from the first step portion 110, and the first raised portion or the first O-ring 230 is fitted to the second raised portion 322. At this time, the impact hammer assembly 200 and the striker pin assembly 300 are locked together, so that the impact hammer assembly 200 can transmit driving force or energy to the striker pin assembly 300. In this way, the power tool of the present application can connect and disconnect the impact hammer assembly and the striker pin assembly. Due to the connection method of the power tool of the present application, a dimensional reduction in the axial direction AA can be achieved, and the mechanical processing of the individual components is relatively simple, thereby reducing manufacturing and production costs.

[0020] Fig. 3 and Fig. 4 show the operation of another embodiment of a power tool according to the present application. For reasons of clarity, Fig. 3 and Fig. 4 only some of the components of the power tool are shown. Fig. 3 and Fig. In the embodiments shown in Figure 4, the firing pin assembly 300 may further include a third O-ring 350. The third O-ring 350 may be disposed in a recess on the inside of the guide sleeve 320 and positioned between the guide sleeve 320 and the elongated portion 311 of the firing pin body 310. Similarly, a second stepped portion 312 may be disposed on the outer surface of the elongated portion 311, wherein the second stepped portion 312 is adapted to the third O-ring 350. The third O-ring 350 may provide the power tool with a sealing capability to block the indiscriminate flow of lubricating oil. Fig. 3 and Fig. 4 show embodiments in a first state and a second state.

[0021] In one embodiment, the guide sleeve 320 and the detent spring 330 can be arranged near the opening 120 on the housing 100. The opening 120 can be an opening for a lubricating fluid. In one embodiment, openings 120 are arranged on the top and bottom of the housing 100, respectively.

[0022] Fig. Figure 5 shows further features of a power tool according to the present application. As in Fig. 5, the power tool according to the present application may be a shock hammer or an electric hammer, and the individual features described in detail above may be incorporated inside the power tool as components on the drive force transmission path.

[0023] Fig. Figure 6 shows a further embodiment of a power tool according to the present application. For reasons of clarity, Fig. 6 only a part of the components of the power tool is shown. Fig. 6, the percussion hammer body 210 may, in addition to the features shown in the embodiments in Fig. 3 and Fig. 4, have one or more through-holes 360. The through-hole 360 ​​can extend from the axial recess 211 to the outer surface of the percussion hammer body 210, i.e., the through-hole 360 ​​can extend through the percussion hammer body 210. In the illustrated embodiment, the through-hole 360 ​​is positionable near the first O-ring 230 and can extend in the radial direction RR, which is approximately perpendicular to the axial direction AA. In one embodiment, the through-hole 360 ​​can be a linear hole. The through-hole 360 ​​can serve as a vent hole to provide gas passage within the axial recess 211, thereby preventing overpressure or underpressure in the axial recess 211 during operation.

[0024] The term axial direction AA refers here to the essentially horizontal direction in the individual figures, i.e., the direction in which the lengths of the impact hammer body 210 and the impact pin body 310 extend. The term radial direction RR refers here to the essentially vertical direction in the individual figures, i.e., the direction in which a ray emanating from a point in the axial direction AA is directed in a plane perpendicular to the axial direction AA.

[0025] Fig. Figure 7 shows a further embodiment of a power tool according to the present application. For reasons of clarity, Fig. 7 only a part of the components of the power tool is shown. Fig. 7, the firing pin assembly 300 may comprise a second O-ring 340 in addition to the third O-ring 350. The second O-ring 340 may be arranged between the first step portion 110 and the first locking portion 321. Between the firing pin assembly 300 and the housing 100, a certain amount of damping may be provided by the second O-ring 340. In addition, in the embodiment shown in Fig. 7, a second stepped portion 312 and a third O-ring are arranged on the outer surface of the elongated portion 311. In one embodiment, the outer surface of the elongated portion 311 may be smooth and may not include the second stepped portion and the third O-ring.

[0026] The power tool according to the present application has the advantages of simplicity, reliability, ease of implementation, and user-friendliness. The power tool according to the present application has reduced axial dimensions and achieves improved connection stability between components and reduced assembly difficulty.

[0027] The present application is disclosed in this specification with reference to the figures and enables those skilled in the art to implement the present application, including making and using any device or system, selecting suitable materials, and using any combination of methods. The scope of the present application is defined by the technical solutions for which patent protection is sought and also includes other examples that may occur to those skilled in the art.To the extent that these further examples comprise structural elements which do not differ from the literal formulation of the technical solutions for which patent protection is claimed, or to the extent that these further examples comprise equivalent structural elements which do not differ substantially from the literal formulation of the technical solutions for which patent protection is claimed, these further examples are to be considered as falling within the scope of protection of the technical solutions for which patent protection is claimed in this application.

Claims

[1] Power tool, characterized by that it includes: a housing (100) for defining a cavity (101) arranged therein, wherein at least a part of the cavity (101) extends in the axial direction (AA); a percussion hammer assembly (200) inserted into the cavity (101) and configured for reciprocating movement in the axial direction (AA); a striker pin assembly (300) inserted into the cavity (101) and located near the striker hammer assembly (200); an electric motor for delivering driving power to the impact hammer assembly (200); and a tool head connected to the striker pin assembly (300) and extending outside the housing (100); wherein an axial recess (211) which is concave in the axial direction (AA) is arranged at one end of the impact hammer arrangement (200) near the impact pin arrangement (300), wherein a first raised portion is formed on the inner wall of the axial recess (211), wherein a second raised portion (322) which is annular is arranged at one end of the impact pin arrangement (300) near the impact hammer arrangement (200), wherein the first elevation portion and the second elevation portion (322) are dimensioned to mate with each other so that the hammer assembly (200) and the striker pin assembly (300) can be selectively locked together. [2] Power tool according to claim 1, characterized bythat at least a part of the striking pin arrangement (300) is positioned within the axial recess (211) when the hammer arrangement (200) and the striking pin arrangement (300) are selectively locked together. [3] Power tool according to claim 1, characterized by that the impact hammer assembly (200) comprises: a percussion hammer body (210), wherein the axial recess (211) is arranged at one end of the percussion hammer body (210); wherein the firing pin assembly (300) comprises: a firing pin body (310) having an elongated portion (311) extending in the axial direction (AA), the elongated portion (311) being oriented to face the axial recess (211); and a guide sleeve (320) fitted onto the outer surface of the elongated portion (311) to guide the movement of the firing pin body (310) in the axial direction (AA), wherein the second raised portion (322) is formed on the outer surface of one end of the guide sleeve (320), wherein a first detent portion (321) is formed on the outer surface of the other end of the guide sleeve (320). [4] Power tool according to claim 3, characterized by that the impact hammer assembly (200) further comprises: an inner lining (220) which is attached to the hammer body (210) from the outside and is located between the hammer body (210) and the housing (100). [5] Power tool according to claim 3, characterized by that the firing pin assembly (300) further comprises: a detent spring (330) which is attached to the outer circumference of the first detent section (321). [6] Power tool according to claim 3, characterized by that the housing (100) has a first step portion (110), wherein the first step portion (110) is adapted to the first locking portion (321) in order to limit the movement of the guide sleeve (320) in the axial direction (AA). [7] Power tool according to claim 6, characterized by that the firing pin assembly (300) further comprises: a second O-ring (340) disposed between the first step portion (110) and the first locking portion (321). [8] Power tool according to one of claims 3 to 7, characterized by that the firing pin assembly (300) further comprises: a third O-ring (350) disposed in a recess on the inner wall of the guide sleeve (320) and in contact with the outer surface of the elongated portion (311). [9] Power tool according to claim 8, characterized bythat the outer surface of the elongated portion (311) has a second step portion (312), wherein the third O-ring (350) is dimensioned to adapt to the second step portion (312). [10] Power tool according to one of claims 3 to 7, characterized by that the impact hammer body (210) further comprises one or more through holes (360), wherein the through hole (360) extends from the axial recess (211) to the outer surface of the impact hammer body (210). [11] Power tool according to one of claims 1 to 7, characterized by in that the first raised portion comprises a first O-ring (230), wherein the first O-ring (230) is arranged in a recess on the inner wall of the axial recess (211), wherein the outer surface of the first O-ring (230) protrudes from the inner wall of the axial recess (211) to form the first raised portion. [12] Power tool according to one of claims 1 to 7, characterized by that the power tool is an electric hammer or a shock hammer.

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