CN211414943U - Knocking spanner - Google Patents
Knocking spanner Download PDFInfo
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- CN211414943U CN211414943U CN201921839709.5U CN201921839709U CN211414943U CN 211414943 U CN211414943 U CN 211414943U CN 201921839709 U CN201921839709 U CN 201921839709U CN 211414943 U CN211414943 U CN 211414943U
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- impact
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- connecting rod
- hole
- wrench
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Abstract
The utility model provides a knocking wrench, which comprises a connecting rod component, an impact component and an execution component fixedly connected with one end of the connecting rod component; a bayonet matched with the shape of the bolt, the screw and/or the nut is arranged on the execution assembly; the impact assembly comprises an impact piece, a first through hole extending along the axis direction of the connecting rod assembly is formed in the impact piece, the connecting rod assembly penetrates through the first through hole, and the impact assembly moves on the connecting rod assembly in a reciprocating mode along the axis direction of the connecting rod assembly. The utility model discloses can solve among the prior art use heavy instrument such as hand hammer hit when hitting the handle that strikes the spanner hit the position inaccurate and hit the problem that power is not enough, moreover the utility model discloses simple structure, the simple operation.
Description
Technical Field
The utility model relates to a mechanical maintenance technical field especially relates to a strike spanner.
Background
The wrench is a common mounting and dismounting tool, and refers to a manual tool for screwing bolts, screws, nuts and other threads to tightly hold open or trepanning fasteners of the bolts or nuts by utilizing the lever principle. The wrench is usually provided with an opening or a trepan for clamping the handle part and applying external force to the handle part so as to screw the bolt or the nut to hold the bolt or the nut, at one end or two ends of the handle part. When the screw is used, external force is applied to the handle part along the rotation direction of the screw thread, and the bolt or the nut can be screwed. However, in the actual installation and disassembly process, when the weight of the bolt, the screw, the nut and other screw threads for tightly holding the opening or trepanning firmware of the bolt or the nut is too large or the nut is rusted after long-time use, the pre-tightening or rotating effect cannot be fully achieved by using a common wrench for installation or disassembly, and the installation and the disassembly are not easy.
In the prior art, tools such as a hand hammer are generally used for assisting operation, and in the process of detaching or installing components such as bolts, nuts and the like, the handle of a knocking wrench is hit by a heavy tool such as the hand hammer so as to achieve the purpose of detaching or installing the components such as the bolts, the nuts and the like.
However, the above-mentioned method has problems of inaccurate striking position and insufficient striking force, and is inconvenient to carry heavy tools such as a hammer while going out.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one problem mentioned in the background art, the utility model provides a strike spanner can solve among the prior art and use heavy instrument such as hand hammer to strike and hit and strike the problem that the position is inaccurate and the power of beating is not enough when striking the handle of striking spanner, moreover the utility model discloses simple structure, simple operation.
In order to achieve the purpose, the utility model provides a knocking wrench, which comprises a connecting rod component, an impact component and an execution component fixedly connected with one end of the connecting rod component; and a bayonet matched with the shape of the bolt, the screw and/or the nut is arranged on the execution assembly.
The impact assembly comprises an impact piece, a first through hole extending along the axis direction of the connecting rod assembly is formed in the impact piece, the connecting rod assembly penetrates through the first through hole, and the impact assembly moves on the connecting rod assembly in a reciprocating mode along the axis direction of the connecting rod assembly.
In the above striking wrench, optionally, the impact assembly further includes: a protruding member; the protruding member is disposed on an outer wall of the impact member.
In the knocking wrench, optionally, at least two protruding parts are arranged, and the at least two protruding parts are uniformly distributed on the outer wall of the impact piece at intervals along the circumferential direction of the impact piece.
In the impact wrench, optionally, the connecting rod assembly includes: a connecting rod and a blocking piece; one end of the connecting rod is connected with the execution assembly, and the other end of the connecting rod is provided with the blocking piece; the maximum dimension of the blocking member in the direction perpendicular to the axis of the link is larger than the maximum dimension of the first through hole in the direction perpendicular to the axis of the link.
In the above impact wrench, optionally, a sliding groove extending along the axial direction of the first through hole is formed in an inner wall of the first through hole of the impact member, and a sliding block is arranged on the connecting rod and slides in the sliding groove along the axial direction of the first through hole.
In the impact wrench described above, optionally, one end of the blocking member is detachably connected to the other end of the link rod away from the actuating assembly.
In the impact wrench described above, the blocking member may be of a solid cylindrical structure or a hollow cylindrical structure.
In the knocking wrench, optionally, the actuating assembly includes an actuating member and a contact member connected to the actuating member, and the contact member is provided with a bayonet matched with the shape of the bolt, the screw and/or the nut.
In the knocking wrench, optionally, a second through hole is formed in one end of the actuating element, which is away from the contact element, and a preset included angle is formed between the extending direction of the second through hole and the axial direction of the actuating element 301; one end of the connecting rod, which is far away from the blocking piece, is provided with a connecting part, and the connecting part is fixed in the second through hole.
In the knocking wrench, optionally, the connecting portion is provided with an external thread, the inner wall of the second through hole is provided with an internal thread, and the connecting portion is connected with the second through hole through a thread.
The utility model provides a strike spanner, including link assembly, impact the subassembly and with link assembly's one end fixed connection's executive component. Wherein, be provided with the bayonet socket that matches with the shape of bolt, screw and/or nut on the executive component, the inside of the impact piece of impact subassembly is provided with the first through-hole that extends along link assembly's axis direction, and link assembly's connecting rod is worn to establish in first through-hole, and the impact subassembly is along link assembly's axis direction reciprocating motion on the connecting rod to accurate execution component that strikes. The inner wall of the first through hole of the impact piece is provided with a sliding groove extending along the axis direction of the first through hole, the connecting rod is provided with a sliding block, and the sliding block slides in the sliding groove along the axis direction of the first through hole, so that the impact assembly can slide on the connecting rod more smoothly. Through set up on the connecting rod and stop piece and be greater than the biggest size of first through-hole on the axis direction of perpendicular to connecting rod at the axis direction of perpendicular to connecting rod, when pulling link assembly drive execute subassembly installation or dismantle parts such as bolt and nut, stop the piece and can inject the subassembly that strikes on link assembly, prevent to strike the subassembly and drop from link assembly. Through set up the protrusion piece at the outer wall of impact piece, thereby can make operating personnel grip the protrusion piece and stimulate impact assembly and strike the executive component to avoid hitting the problem that the power is not enough. Therefore, the utility model discloses a thereby set up the impact assembly on link assembly and slide on the connecting rod and realize hitting the purpose of beating the execution module and reach parts such as dismantlement or screw up bolt and nut, simple structure, the simple operation can solve moreover and use heavy tools such as hand hammer to beat when hitting the handle of strikeing the spanner and hit the problem that the position is inaccurate and beat the power not enough among the prior art.
The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a striking wrench according to an embodiment of the present invention;
fig. 2 is a schematic structural view of another impact wrench according to an embodiment of the present invention;
fig. 3 is a schematic structural view of another knocking wrench according to an embodiment of the present invention;
fig. 4 is a schematic structural view of another impact wrench according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a connecting rod assembly of the impact wrench according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an impact assembly of a striking wrench according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an execution assembly of the impact wrench according to an embodiment of the present invention.
Description of reference numerals:
100-knocking spanner;
10-a linkage assembly;
101-a barrier;
102-a connecting rod;
103-a connecting portion;
20-an impact assembly;
201-a striker;
202-a first via;
203-a projection;
30-an execution component;
301-an executive;
3011-a second via;
302-a contact;
3021-bayonet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the present invention, unless otherwise explicitly specified or limited, terms such as "mounted," "connected," and "fixed" are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; it can be mechanically coupled, directly coupled, indirectly coupled through intervening media, coupled between two elements, or coupled between two elements in a mutual relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Fig. 1 is a schematic structural view of a knocking wrench according to an embodiment of the present invention. Fig. 2 is a schematic structural view of another knocking wrench according to an embodiment of the present invention. Fig. 3 is a schematic structural view of another knocking wrench according to an embodiment of the present invention. Fig. 4 is a schematic structural view of another knocking wrench according to an embodiment of the present invention. Fig. 5 is a schematic structural view of a connecting rod assembly of the impact wrench according to an embodiment of the present invention. Fig. 6 is a schematic structural diagram of an impact assembly of a knocking wrench according to an embodiment of the present invention. Fig. 7 is a schematic structural diagram of an execution assembly of the impact wrench according to an embodiment of the present invention.
Referring to fig. 1 to 7, the embodiment of the present invention provides a striking wrench 100, which includes a connecting rod assembly 10, an impact assembly 20, and an actuating assembly 30 fixedly connected to one end of the connecting rod assembly 10. Wherein, the actuating assembly 30 is provided with a bayonet 3021 matching with the shape of the bolt, the screw and/or the nut.
As shown in fig. 1 and 6, the impact assembly 20 includes an impact member 201, a first through hole 202 extending along an axial direction of the connecting rod assembly 10 is provided inside the impact member 201, the connecting rod assembly 10 is inserted into the first through hole 202, and the impact assembly 20 reciprocates on the connecting rod assembly 10 along the axial direction of the connecting rod assembly 10.
As shown in fig. 2 and 6, the impact assembly 20 further includes: a projection 203; the bulge 203 is provided at the outer wall of the impact member 201.
When it is desired to install or remove bolts, screws, nuts, and other threaded fasteners that hold open or trepanned bolts or nuts, the protrusion 203 may be used to facilitate an operator pulling the impact member 201 closer to or further away from the actuator assembly 30 to provide a forceful and accurate impact on the actuator assembly 30.
As an alternative embodiment, at least two protruding members 203 are provided, and at least two protruding members 203 are evenly spaced on the outer wall of the impact member 201 along the circumferential direction of the impact member 201. It should be noted that the number of the protruding members 203 may be two, three or more (two are taken as examples in the drawings), and the present invention is not limited thereto as long as the effect of pulling the impact member 201 can be achieved.
As an alternative embodiment, the protruding part 203 may further be provided with anti-slip threads (not shown in the drawings), and the anti-slip threads may increase friction force, so that an operator can hold the protruding part 203 more stably to drive the impact member 201 to strike the actuating assembly 30.
As shown in fig. 3 to 5, the connecting rod assembly 10 includes: a link 102 and a stopper 101; one end of the connecting rod 102 is connected with the execution assembly 30, and the other end of the connecting rod 102 is provided with a blocking part 101; the maximum dimension of the stopper 101 in the direction perpendicular to the axis of the link 102 is larger than the maximum dimension of the first through hole 202 in the direction perpendicular to the axis of the link 102.
It should be noted that, the maximum dimension of the blocking member 101 in the direction perpendicular to the axis of the connecting rod 102 is larger than the maximum dimension of the first through hole 202 in the direction perpendicular to the axis of the connecting rod 102, and the blocking member 101 can limit the impact assembly 20 on the connecting rod assembly 10, so as to prevent the impact assembly 20 from falling off the connecting rod assembly 10.
It should be noted that the blocking member 101 and the other end of the connecting rod 102 away from the actuating assembly 30 can be detachably connected, for example, by a threaded connection, a pin connection or a snap connection, wherein the specific structure of the detachable connection is not limited in this embodiment. Further, the other ends of the blocking member 101 and the connecting rod 102 far away from the actuating assembly 30 may also be connected in a non-detachable manner, for example, the connecting ends of the blocking member 101 and the connecting rod 102 far away from the actuating assembly 30 are both made of metal, and at this time, the blocking member 101 and the connecting rod 102 may be connected in a welding manner.
In a preferred embodiment, one end of the blocking member 101 is detachably connected to an end of the link 102 remote from the actuating assembly 30. In the actual installation and disassembly process, under the condition that the weight of bolts, screws, nuts and other openings or trepanning fasteners for tightly clamping the bolts or the nuts through threads is small or corrosion does not occur, the pre-tightening or rotating effect can be achieved without using the impact assembly 20, and when one end of the blocking piece 101 is detachably connected with one end of the connecting rod 102 far away from the execution assembly 30, the impact assembly 20 can be conveniently detached from the connecting rod assembly 10 after the blocking piece 101 and one end of the connecting rod 102 far away from the execution assembly 30 are detached.
It should be noted that the blocking member 101 may be a cylinder structure, a rectangular parallelepiped structure, etc., and the present invention is not limited to the specific structure of the blocking member 101 as long as the effect of limiting the impact assembly 20 on the connecting rod assembly 10 can be achieved.
As a preferred embodiment, the barrier 101 may have a cylindrical structure. When stopping piece 101 can be the cylinder structure, when using the utility model provides a strike spanner 100 installation or dismantlement, stop piece 101 can be convenient for operating personnel more and carry out gripping and application of force.
In addition, the blocking member 101 may further have anti-slip threads (not shown in the figure), and the anti-slip threads may increase friction force, so that an operator can more stably hold the blocking member 101 to pull the connecting rod assembly and drive the actuating assembly 30 to mount or dismount a bolt, a screw, a nut, or the like.
The specific connection position of the blocking member 101 and the connecting rod 102 has the following two possible implementation manners:
one possible implementation is: the end of the blocking member 101 is fixedly connected to the end of the connecting rod 102, and in this case, the blocking member 101 may have a solid cylindrical structure or a hollow cylindrical structure.
Another possible implementation is: the blocking member 101 is a hollow cylinder structure, and the blocking member 101 is sleeved on an end of the connecting rod 102 far away from the actuating assembly 30.
In addition, in order to make the impact member 201 slide on the connecting rod 102 more smoothly, the inner wall of the first through hole 202 of the impact member 201 may further be provided with a sliding groove extending along the axial direction of the first through hole 202, and the connecting rod 102 may further be provided with a sliding block sliding in the sliding groove along the axial direction of the first through hole 202.
Specifically, as shown in fig. 7, the actuator assembly 30 includes an actuator 301 and a contact 302 connected to the actuator 301, wherein the contact 302 is provided with a bayonet 3021 matching the shape of a bolt, a screw and/or a nut.
For example, when the bolt, screw and/or nut is hexagonal in shape, the bayonet 3021 provided on the contact 302 is also hexagonal in shape.
A second through hole 3011 is formed in one end, away from the contact piece 302, of the actuator 301, and a preset included angle is formed between the extending direction of the second through hole 3011 and the axial direction of the actuator 301; one end of the connecting rod 102 away from the blocking member 101 is provided with a connecting portion 103, and the connecting portion 103 is fixed in the second through hole 3011.
It should be noted that the utility model discloses the angle to predetermine the contained angle between the extending direction of second through-hole 3011 and the axial direction of executive 301 does not restrict, can set up according to the demand of practical application scene. Generally, the second through hole 3011 extends in a direction perpendicular to the axial direction of the actuator 301.
It should be noted that the present invention does not limit the maximum size of the connecting portion 103 in the direction perpendicular to the axis of the connecting rod 102, and the maximum size can be set according to the requirements of the actual application scenario. For example, the maximum dimension of the connecting portion 103 in the direction perpendicular to the axis of the link 102 may be larger than the maximum dimension of the link 102 in the direction, may be equal to the maximum dimension of the link 102 in the direction, or may be smaller than the maximum dimension of the link 102 in the direction.
As a preferred embodiment, the maximum dimension of the connecting portion 103 in the direction perpendicular to the axis of the link 102 is smaller than the maximum dimension of the link 102 in that direction. In the actual assembling and disassembling process, under the condition that the weight of a bolt, a screw, a nut and other opening or trepanning fasteners for tightly clamping the bolt or the nut in a threaded mode is small or corrosion does not occur, the pre-tightening or rotating effect can be achieved without using the impact assembly 20, and when the maximum size of the connecting part 103 in the direction perpendicular to the axis of the connecting rod 102 is smaller than the maximum size of the connecting rod 102 in the direction, the impact assembly 20 can be conveniently detached from the connecting rod assembly 10.
In addition, the connecting portion 103 may further have an external thread, the inner wall of the second through hole 3011 has an internal thread, and the connecting portion 103 and the second through hole 3011 are connected by a thread.
The embodiment of the utility model provides a strike spanner, including link assembly, impact the subassembly and with link assembly's one end fixed connection's executive component. Wherein, be provided with the bayonet socket that matches with the shape of bolt, screw and/or nut on the executive component, the inside of the impact piece of impact component is provided with the first through-hole that extends along link assembly's axis direction, and link assembly's connecting rod is worn to establish in first through-hole, and the impact component is along link assembly's axis direction reciprocating motion on the connecting rod to reach the effect of accurate execution component of knocking. The inner wall of the first through hole of the impact piece is provided with a sliding groove extending along the axis direction of the first through hole, the connecting rod is provided with a sliding block, and the sliding block slides in the sliding groove along the axis direction of the first through hole, so that the impact assembly can slide on the connecting rod more smoothly. Through set up on the connecting rod and stop piece and be greater than the biggest size of first through-hole on the axis direction of perpendicular to connecting rod at the axis direction of perpendicular to connecting rod, when pulling link assembly drive execute subassembly installation or dismantle parts such as bolt and nut, stop the piece and can inject the subassembly that strikes on link assembly, prevent to strike the subassembly and drop from link assembly. Through set up the protrusion piece at the outer wall of impact piece, thereby can make operating personnel grip the protrusion piece and stimulate impact assembly and strike the executive component to avoid hitting the problem that the power is not enough. Therefore, the utility model discloses a thereby set up the impact assembly on link assembly and slide on the connecting rod and realize hitting the purpose of beating the execution module and reach parts such as dismantlement or screw up bolt and nut, simple structure, the simple operation can solve moreover and use heavy tools such as hand hammer to beat when hitting the handle of strikeing the spanner and hit the problem that the position is inaccurate and beat the power not enough among the prior art.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The knocking wrench is characterized by comprising a connecting rod assembly, an impact assembly and an execution assembly fixedly connected with one end of the connecting rod assembly; a bayonet matched with the shape of the bolt, the screw and/or the nut is arranged on the execution assembly;
the impact assembly comprises an impact piece, a first through hole extending along the axis direction of the connecting rod assembly is formed in the impact piece, the connecting rod assembly penetrates through the first through hole, and the impact assembly moves on the connecting rod assembly in a reciprocating mode along the axis direction of the connecting rod assembly.
2. The impact wrench of claim 1, wherein the impact assembly further comprises: a protruding member; the protruding member is disposed on an outer wall of the impact member.
3. The impact wrench as claimed in claim 2, wherein said projecting members are provided in at least two numbers, and at least two of said projecting members are evenly spaced on an outer wall of said impact member in a circumferential direction of said impact member.
4. The impact wrench of claim 1, wherein the linkage assembly comprises: a connecting rod and a blocking piece; one end of the connecting rod is connected with the execution assembly, and the other end of the connecting rod is provided with the blocking piece; the maximum dimension of the blocking member in the direction perpendicular to the axis of the link is larger than the maximum dimension of the first through hole in the direction perpendicular to the axis of the link.
5. The impact wrench according to any one of claims 1 to 4, wherein the inner wall of the first through hole of the impact member is provided with a slide groove extending in the axial direction of the first through hole, and the link is provided with a slider sliding in the slide groove in the axial direction of the first through hole.
6. The impact wrench of claim 4, wherein one end of the blocking member is removably coupled to the other end of the linkage remote from the actuating assembly.
7. The impact wrench of claim 6, wherein the blocking member is of a solid cylindrical configuration or a hollow cylindrical configuration.
8. The impact wrench as claimed in claim 4, wherein the actuating assembly comprises an actuating member and a contact member connected to the actuating member, wherein the contact member is provided with a bayonet matching the shape of the bolt, screw and/or nut.
9. The impact wrench as claimed in claim 8, wherein a second through hole is formed at an end of the actuating member away from the contact member, and the extending direction of the second through hole forms a predetermined included angle with the axial direction of the actuating member; one end of the connecting rod, which is far away from the blocking piece, is provided with a connecting part, and the connecting part is fixed in the second through hole.
10. The impact wrench as claimed in claim 9, wherein the connecting portion is provided with external threads, the inner wall of the second through hole is provided with internal threads, and the connecting portion is connected with the second through hole through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921839709.5U CN211414943U (en) | 2019-10-30 | 2019-10-30 | Knocking spanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921839709.5U CN211414943U (en) | 2019-10-30 | 2019-10-30 | Knocking spanner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211414943U true CN211414943U (en) | 2020-09-04 |
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ID=72251123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921839709.5U Active CN211414943U (en) | 2019-10-30 | 2019-10-30 | Knocking spanner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211414943U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026755A (en) * | 2022-06-13 | 2022-09-09 | 满洲里达赉湖热电有限公司 | Diversified safe fixing device of spanner strikes |
-
2019
- 2019-10-30 CN CN201921839709.5U patent/CN211414943U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026755A (en) * | 2022-06-13 | 2022-09-09 | 满洲里达赉湖热电有限公司 | Diversified safe fixing device of spanner strikes |
| CN115026755B (en) * | 2022-06-13 | 2023-11-07 | 满洲里达赉湖热电有限公司 | Multidirectional safety fixing device for knocking wrench |
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