A current carrying device for overcurrent switch

Abstract

The present invention discloses an overcurrent switch current-carrying device, the structure of which includes a bottom shell, a first conductive sheet having a first upper terminal and a first lower terminal, a second conductive sheet having a second upper terminal and a second lower terminal, a push rod, a first conductive component and a second conductive component, etc.; when working, the push rod first conductively connects the first lower terminal and the second lower terminal to form a first conductive loop through the reciprocating movement of the push rod, and then conductively connects the first upper terminal and the second upper terminal to form a second conductive loop, or first disconnects the second conductive loop and then disconnects the first conductive loop. Since the setting and movement of the two conductive loops are separated in sequence, the movement process is more stable and safe. At the same time, the first conductive component also adopts surface contact conduction or disconnection, so it can more stably withstand the load current generated by the electric tool, and will not cause problems such as increased resistance and excessive temperature rise after long-term use. It also has the advantages of compact structural design, small size, low production cost, etc.

Description

Technical Field

[0001] The invention relates to an overcurrent current carrying device, in particular to an overcurrent switch current carrying device used for opening or closing electric tools such as electric wrenches. Background Art

[0002] The overcurrent carrying device of the switch is mainly used in electric tools such as electric wrenches with relatively large power. In actual applications, these types of electric tools have relatively harsh operating environments, relatively heavy loads, and relatively long service lives. Therefore, the requirements for the use of switches are relatively stringent. The switch must be able to withstand the instantaneous large current generated by the electric tool when it is started, and provide stable current output during use. At the same time, the switch can also withstand a large instantaneous breaking current when it is disconnected; therefore, the switch current carrying device needs to be able to stably withstand the load current generated by the electric tool.

[0003] Most similar switches on the market currently have defects such as short electrical life and inability to withstand high-power tool applications. The root cause is that the structure layout of the switch current-carrying device is not reasonable and all wire contacts are used for conductive connection. Figure 3 The figure shows the common internal structure of the overcurrent switch, which is mainly composed of a housing 1, a first conductive sheet 2 and a second conductive sheet 3 on the housing, and a push rod 4 reciprocatingly installed in the housing 1. The first conductive sheet 2 and the second conductive sheet 3 are not only arranged adjacent to each other, but also the first conductive component 5 and the second conductive component 6 for conductive matching are also arranged adjacent to each other, and a seesaw-type installation structure is adopted. During operation, the reciprocating movement of the push rod 4 successively drives the first conductive component 5 and the second conductive component 6 to form contact conduction similar to the seesaw movement. Therefore, designing the two conductive contact motion mechanisms too close not only easily leads to safety hazards, but also increases the friction resistance of the switch current-carrying device by adopting the line contact conduction mode, resulting in too small a current-carrying area of ​​the switch. After a certain number of times of use, the conductive silver layer is often damaged, causing increasing resistance and high temperature rise; in addition, the structural design of the current-carrying device of the overcurrent switch is not compact enough, the volume is too large, and the production cost is also increased. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an overcurrent switch current-carrying device that can stably withstand the load current generated by the electric tool, will not increase resistance and excessive temperature rise during long-term use, and is safer to use.

[0005] The technical problem of the present invention is achieved through the following technical solutions:

[0006] A current-carrying device of an overcurrent switch comprises a shell, a first conductive sheet and a second conductive sheet on the shell, and a push rod reciprocatingly installed in the shell, wherein the first conductive sheet has a first upper terminal and a first lower terminal respectively arranged on both sides of the push rod, the second conductive sheet has a second upper terminal and a second lower terminal respectively arranged on both sides of the push rod, and the push rod is provided with a first conductive component and a second conductive component; the first conductive sheet is bent into a "[" shape, the upper bending end of the "[" shape is set as the first upper terminal located on the upper side of the push rod, and the lower bending end of the "[" shape is set as the first lower terminal located on the lower side of the push rod; the second conductive sheet is bent into a "]" shape, the upper bending end of the "]" shape is set as the first lower terminal located on the upper side of the push rod The second upper terminal, the "]"-shaped lower bent end is set as the second lower terminal located on the lower side of the push rod; the first conductive component includes an upper conductive bridge arranged on the upper side of the push rod, and the upper conductive bridge contacts and conductively connects with the second upper terminal; the second conductive component includes a lower conductive bridge installed in a seesaw style on the second lower terminal; the reciprocating movement of the push rod first drives the second conductive component to conductively connect the first lower terminal and the second lower terminal respectively, and then drives the first conductive component to conductively connect the first upper terminal and the second upper terminal respectively, or first drives the first conductive component to disconnect the conductive connection between the first upper terminal and the second upper terminal, and then drives the second conductive component to disconnect the conductive connection between the first lower terminal and the second lower terminal.

[0007] The push rod is composed of a working head arranged in a shell and an extension rod extending out of the shell, and the working head is driven to move back and forth in the shell through the extension rod.

[0008] A return spring is arranged in the shell, one end of the return spring is pushed and installed on the guide shaft in the shell, and the other end of the return spring is pushed and installed in the guide hole of the working head, and the return spring elastically pushes the working head to move outward.

[0009] The extension rod drives the working head in the shell to move inward, and pushes the inner end of the lower conductive bridge to descend to respectively connect the first lower terminal and the second lower terminal conductively; the reset spring elastically pushes the working head to move outward, and pushes the outer end of the lower conductive bridge to descend, and the inner end of the lower conductive bridge rises and disengages from the first lower terminal, thereby disconnecting the conductive connection between the first lower terminal and the second lower terminal.

[0010] The lower side of the working head is provided with a bullet that elastically pushes downward and contacts the lower conductive bridge; the working head moves inward and drives the bullet to move inward along the lower conductive bridge to push the inner end of the lower conductive bridge down; the working head moves outward and drives the bullet to move outward along the lower conductive bridge to push the outer end of the lower conductive bridge down.

[0011] A dynamic conductive contact is arranged at the inner end of the lower conductive bridge, and a static conductive contact is arranged on the first lower terminal accordingly. The dynamic and static conductive contacts are in contact with each other for conduction or are disconnected.

[0012] The second conductive component includes an upper conductive bridge arranged on the side of the working head, which contacts and electrically connects the second upper terminal; the extension rod drives the working head in the shell to move inward, and drives the upper conductive bridge to electrically connect the first upper terminal and the second upper terminal respectively; the reset spring elastically pushes the working head to move outward, and drives the upper conductive bridge to separate from the first upper terminal, thereby disconnecting the conductive connection between the first upper terminal and the second upper terminal.

[0013] The upper conductive bridge is bent into a "bow" shape, and the "bow"-shaped upper conductive bridge is horizontally positioned and installed in the positioning groove of the working head, and is elastically pushed outward in the radial direction by the upper elastic element in the positioning groove.

[0014] The first upper terminal is provided with a first contact piece, and the second upper terminal is provided with a second contact piece; the upper conductive bridges respectively conductively connect the first contact piece and the second contact piece, or disconnect the conductive connection between the first contact piece and the second contact piece.

[0015] Compared with the prior art, the present invention mainly designs the first conductive sheet to have the first upper terminal and the first lower terminal respectively arranged on both sides of the push rod, and the second conductive sheet to have the second upper terminal and the second lower terminal respectively arranged on both sides of the push rod, and the push rod is provided with the first conductive component and the second conductive component; when working, the reciprocating movement of the push rod will first drive the second conductive component on the lower side to respectively connect the first lower terminal and the second lower terminal to form a first conductive loop, and then drive the first conductive component on the upper side to respectively connect the first upper terminal and the second upper terminal to form a second conductive loop, or first drive the first conductive component on the upper side to disconnect the conductive connection between the first upper terminal and the second upper terminal, that is, first disconnect the second conductive loop, and then drive the second conductive component on the lower side to disconnect the conductive connection between the first lower terminal and the second lower terminal, that is, disconnect the first conductive loop. Since the two conductive loops are separately arranged, the movement process is also carried out separately, so the stability and safety of the conductive movement process can be better guaranteed. At the same time, the first conductive component also conducts or disconnects the first upper terminal and the second upper terminal according to the surface contact structure. Compared with the traditional line contact conduction, it can not only more stably withstand the load current generated by the power tool, but also will not have problems such as increased resistance and excessive temperature rise during long-term use, thereby effectively solving the drawbacks of line contact conduction in this field. In addition, this overcurrent switch current-carrying device also has the advantages of compact structural design, small size, and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of the present invention.

[0017] Figure 2 for Figure 1 Exploded three-dimensional diagram.

[0018] Figure 3 This is a schematic diagram of the internal structure of a common overcurrent switch. DETAILED DESCRIPTION

[0019] The embodiments of the present invention will be described in detail below with reference to the above-mentioned drawings.

[0020] like Figure 1 to Figure 3 As shown, 1. housing, 11. guide shaft, 2. first conductive sheet, 21. first upper terminal, 22. first lower terminal, 23. static conductive contact, 24. first contact sheet, 3. second conductive sheet, 31. second upper terminal, 32. second lower terminal, 33. rocker seat, 34. second contact sheet, 4. push rod, 41. working head, 42. extension rod, 43. guide hole, 44. bottom hole, 45. positioning groove, 5. first conductive component, 51. upper conductive bridge, 52. upper elastic element, 6. second conductive component, 61. lower conductive bridge, 62. moving conductive contact, 7. bullet head, 71. lower elastic element, 8. reset spring, 9. wire.

[0021] An overcurrent switch current carrying device, such as Figure 1 , Figure 2 As shown, it mainly relates to an overcurrent switch current-carrying device for opening or closing an electric tool such as an electric wrench, and its structure includes a housing 1, a first conductive sheet 2, a second conductive sheet 3 and a push rod 4, etc. The push rod is installed in the housing 1 and can move back and forth inward and outward along the axial direction, that is, along the horizontal direction. Figure 1 The left side of the view shown is used as the inward movement direction of the push rod 4, and the right side of the view is used as the outward movement direction of the push rod 4.

[0022] The shell 1 is the installation base of the current-carrying device and is made of non-conductive plastic material into a rectangular box shape; the first conductive sheet 2 and the second conductive sheet 3 are respectively embedded and fixed on both sides of the shell 1, i.e., the left side and the right side, and wires 9 are connected thereto, and the first conductive sheet 2 has a first upper terminal 21 respectively arranged on both sides of the push rod 4, i.e., the upper side of the push rod and a first lower terminal 22 on the lower side of the push rod, and the second conductive sheet 3 also has a second upper terminal 31 respectively arranged on both sides of the push rod 4, i.e., the upper side of the push rod and a second lower terminal 32 on the lower side of the push rod.

[0023] The specific structure is as follows: the first conductive sheet 2 is bent into a “[” shape, the upper bent end of the “[” shape is located on the upper side of the push rod 4 and serves as the first upper terminal 21, the lower bent end of the “[” shape is located on the lower side of the push rod 4 and serves as the first lower terminal 22, a first contact sheet 24 is provided at the first upper terminal 21, and its position is on the rear side of the push rod 4, and a fixed static conductive contact 23 is provided on the first lower terminal 22.

[0024] The second conductive sheet 3 is bent into a “]” shape, the upper bent end of the “]” shape is located on the upper side of the push rod 4 and serves as the second upper terminal 31, the lower bent end of the “]” shape is located on the lower side of the push rod 4 and serves as the second lower terminal 32, a second contact sheet 34 is provided at the second upper terminal 31, and its position is also on the rear side of the push rod 4, and a bent rocker seat 33 is provided on the second lower terminal 32.

[0025] The push rod 4 is composed of a working head 41 arranged in the shell 1 and an extension rod 42 extending out of the shell. The working head 41 is in the shape of a rectangular block, and the extension rod 42 is in the shape of a cylindrical rod. The two are on the same axial line, and the extension rod 42 is also a driving rod that receives force for switch operation. The extension rod 42 can drive the working head 41 to reciprocate inward and outward in the shell 1.

[0026] However, a return spring 8 is also provided in the housing 1, and one end of the return spring, i.e. the inner end, is pushed and installed on the guide shaft 11 in the housing 1, and the other end of the return spring 8, i.e. the outer end, is pushed and installed in the guide hole 43 of the working head 41. Therefore, under normal circumstances, the working head 41 is always in an outward moving state due to the elastic push of the return spring 8, that is, the outward movement of the working head 41 is provided by the elastic push force of the return spring 8, and the working head 41 can only be driven to move inward by pushing the extension rod 42 inward to overcome the elastic push force of the return spring 8, that is, the inward movement of the working head 41 is achieved by operating the extension rod 42 to push inward.

[0027] The push rod 4 is provided with a first conductive component 5 and a second conductive component 6 .

[0028] The second conductive component 6 is arranged below the push rod 4, and its structure is as follows: Figure 2 As shown, it mainly includes a lower conductive bridge 61 installed in a seesaw style on the second lower terminal 32 and in the seesaw seat 33. Since the lower conductive bridge and the second lower terminal 32 are both metal conductors, the installation of the lower conductive bridge 61 in the seesaw seat 33 can actually constitute a conductive connection between the lower conductive bridge 61 and the second lower terminal 32. A dynamic conductive contact 62 is provided at the inner end of the lower conductive bridge 61, which is mainly to follow the movement of the lower conductive bridge 61 and cooperate with the static conductive contact 23 on the first lower terminal 22, that is, the dynamic and static conductive contacts can form contact and conduction or be separated and disconnected with each other.

[0029] A bottom hole 44 with an opening facing downward is provided on the lower side of the working head 41, in which a bullet 7 is installed, which is elastically pushed downward by a lower elastic element 71 and contacts the lower conductive bridge 61. The purpose of designing the lower elastic element 71 is to ensure that the bullet 7 can better fit the lower conductive bridge 61, so that the subsequent actions of the bullet 7 can be more stable and reliable.

[0030] In this way, when the working head 41 is driven to move inward by the extension rod 42 to overcome the elastic thrust of the reset spring 8, the bullet head 7 will be driven to move inward along the lower conductive bridge 61, thereby pushing the inner end of the lower conductive bridge 61 down, so that the moving conductive contact 62 and the static conductive contact 23 on the first lower terminal 22 are in contact, and at this time, the first lower terminal 22 and the second lower terminal 32 can be respectively conductively connected.

[0031] When the thrust on the extension rod 42 is released, the reset spring 8 will push the working head 41 outward due to elastic reset, and drive the bullet 7 to move outward along the lower conductive bridge 61 to push the outer end of the lower conductive bridge 61 down. At the same time, due to the particularity of the seesaw structure, the inner end of the lower conductive bridge 61 rises synchronously, thereby driving the moving conductive contact 62 to disengage from the static conductive contact 23 on the first lower terminal 22. At this time, the conductive connection between the first lower terminal 22 and the second lower terminal 32 can be disconnected.

[0032] The first conductive component 5 includes an upper conductive bridge 51 arranged on the upper side of the working head 41. The upper conductive bridge is always in contact with the second upper terminal 31 to form a conductive connection, and can also conductively connect the first contact piece 24 and the second contact piece 34 respectively, and can also disconnect the conductive connection between the first contact piece 24 and the second contact piece 34.

[0033] The upper conductive bridge 51 is bent into a "bow" shape, and the "bow"-shaped upper conductive bridge is horizontally positioned in the positioning groove 45 of the working head 41, that is, the bow shape faces the rear side and can only move forward and backward, and is also always elastically pushed outward in the radial direction, that is, backward, by a pair of upper elastic elements 52 in the positioning groove 45.

[0034] The purpose of designing a pair of upper elastic elements 52 is to ensure that the upper conductive bridge 51 can better fit the second contact piece 34 at the second upper terminal 32 and the first contact piece 24 at the first upper terminal 21 .

[0035] In this way, when the working head 41 is driven to move inward by the extension rod 42, the upper conductive bridge 51 can be driven to respectively connect the first upper terminal 21 and the second upper terminal 31 conductively. When the thrust on the extension rod 42 is released, the reset spring 8 will push the working head 41 to move outward due to elastic reset, and drive the upper conductive bridge 51 to separate from the first upper terminal 21, thereby disconnecting the conductive connection between the first upper terminal 21 and the second upper terminal 31.

[0036] The present invention relates to a reciprocating movement of the push rod 4 that has a sequential action, which first drives the second conductive component 6 on the lower side to respectively connect the first lower terminal 22 and the second lower terminal 32 to form a first conductive loop, and then drives the first conductive component 5 on the upper side to respectively connect the first upper terminal 21 and the second upper terminal 31 to form a second conductive loop. The dual-loop design can better achieve the shunting effect.

[0037] When disconnecting, the first conductive component 5 on the upper side is first driven to disconnect the conductive connection between the first upper terminal 21 and the second upper terminal 31, that is, the second conductive loop is first disconnected, and then the second conductive component 6 on the lower side is driven to disconnect the conductive connection between the first lower terminal 22 and the second lower terminal 32, that is, the first conductive loop is disconnected.

[0038] Since the two conductive loops are separately arranged and the movement process is also carried out separately, the stability and safety of the conductive movement process can be better guaranteed. At the same time, the first conductive component 5 also conducts or disconnects the first upper terminal 21 and the second upper terminal 31 according to the surface contact structure. Compared with the traditional line contact conduction, it can not only more stably withstand the load current generated by the power tool, but also will not cause problems such as increased resistance and excessive temperature rise after long-term use, thereby effectively solving the drawbacks of line contact conduction in the current field; in addition, this overcurrent switch current-carrying device also has the advantages of compact structural design, small size, and low production cost.

[0039] The above description is only a specific embodiment of the present invention. Those skilled in the art should understand that any structural design similar to this embodiment should be included in the protection scope of the present invention.

Claims

1. An overcurrent switch current-carrying device, comprising a housing (1), a first conductive sheet (2) and a second conductive sheet (3) on the housing, and a push rod (4) reciprocatingly mounted in the housing (1), characterized in that The first conductive sheet (2) has a first upper terminal (21) and a first lower terminal (22) respectively arranged on both sides of the push rod (4); the second conductive sheet (3) has a second upper terminal (31) and a second lower terminal (32) respectively arranged on both sides of the push rod (4); and the push rod (4) is provided with a first conductive component (5) and a second conductive component (6); The first conductive sheet (2) is bent into a "[" shape, the upper bent end of the "[" shape being set as a first upper terminal (21) located on the upper side of the push rod (4), and the lower bent end of the "[" shape being set as a first lower terminal (22) located on the lower side of the push rod (4); the second conductive sheet (3) is bent into a "]" shape, the upper bent end of the "]" shape being set as a second upper terminal (31) located on the upper side of the push rod (4), and the lower bent end of the "]" shape being set as a second lower terminal (32) located on the lower side of the push rod (4); The first conductive component (5) comprises an upper conductive bridge (51) arranged on the upper side of the push rod (4), the upper conductive bridge being in contact with and conductively connected to the second upper terminal (31); the second conductive component (6) comprises a lower conductive bridge (61) mounted on the second lower terminal (32) in a seesaw-like manner; The push rod (4) reciprocates to first drive the second conductive component (6) to respectively connect the first lower terminal (22) and the second lower terminal (32) conductively, and then drive the first conductive component (5) to respectively connect the first upper terminal (21) and the second upper terminal (31) conductively, or first drive the first conductive component (5) to disconnect the conductive connection between the first upper terminal (21) and the second upper terminal (31), and then drive the second conductive component (6) to disconnect the conductive connection between the first lower terminal (22) and the second lower terminal (32).

2. The overcurrent switch current carrying device according to claim 1, characterized in that The push rod (4) is composed of a working head (41) arranged in the housing (1) and an extension rod (42) extending out of the housing, and the extension rod (42) drives the working head (41) to reciprocate in the housing (1).

3. The overcurrent switch current carrying device according to claim 2, characterized in that A return spring (8) is provided in the housing (1), one end of the return spring being pushed and installed on a guide shaft (11) in the housing (1), and the other end of the return spring (8) being pushed and installed in a guide hole (43) of the working head (41), and the return spring (8) elastically pushes the working head (41) to move outward.

4. The overcurrent switch current carrying device according to claim 3, characterized in that The extension rod (42) drives the working head (41) in the housing (1) to move inwards, and pushes the inner end of the lower conductive bridge (61) downwards to respectively connect the first lower terminal (22) and the second lower terminal (32) electrically; the return spring (8) elastically pushes the working head (41) to move outwards, and pushes the outer end of the lower conductive bridge (61) downwards, and the inner end of the lower conductive bridge (61) rises and detaches from the first lower terminal (22), thereby disconnecting the conductive connection between the first lower terminal (22) and the second lower terminal (32).

5. The overcurrent switch current carrying device according to claim 2, characterized in that A bullet (7) is provided on the lower side of the working head (41) for elastically pushing downward and contacting the lower conductive bridge (61); the working head (41) moves inward and drives the bullet (7) to move inward along the lower conductive bridge (61) to push the inner end of the lower conductive bridge (61) downward; the working head (41) moves outward and drives the bullet (7) to move outward along the lower conductive bridge (61) to push the outer end of the lower conductive bridge (61) downward.

6. The overcurrent switch current carrying device according to claim 2, characterized in that A moving conductive contact (62) is provided at the inner end of the lower conductive bridge (61), and a static conductive contact (23) is correspondingly provided on the first lower terminal (22), the moving and static conductive contacts being in contact with each other for conduction or disconnection.

7. The overcurrent switch current carrying device according to claim 3, characterized in that The extension rod (42) drives the working head (41) in the housing (1) to move inwards, and drives the upper conductive bridge (51) to respectively connect the first upper terminal (21) and the second upper terminal (31) in a conductive manner; the return spring (8) elastically pushes the working head (41) to move outwards, and drives the upper conductive bridge (51) to separate from the first upper terminal (21), thereby disconnecting the conductive connection between the first upper terminal (21) and the second upper terminal (31).

8. The overcurrent switch current carrying device according to claim 2, characterized in that The upper conductive bridge (51) is bent into a "bow" shape, and the "bow"-shaped upper conductive bridge (51) is horizontally positioned and installed in a positioning groove (45) of the working head (41), and is elastically pushed outward in the radial direction by an upper elastic element (52) in the positioning groove.

9. The overcurrent switch current carrying device according to claim 1, characterized in that The first upper terminal (21) is provided with a first contact piece (24), and the second upper terminal (31) is provided with a second contact piece (34); the upper conductive bridge (51) respectively conductively connects the first contact piece (24) and the second contact piece (34), or disconnects the conductive connection between the first contact piece (24) and the second contact piece (34).

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