Microswitch

Abstract

The microswitch comprises a shell, a first metal contact piece and a second metal contact piece, the second metal contact piece is provided with an elastic bending part which extends towards the direction of the first metal contact piece, and the free end of the bending part is in disconnectable connection with the first metal contact piece; a pressing piece is arranged on the shell, one end of the pressing piece extends into the shell and abuts against the upper end face of the bent part, a reset spring is arranged in the shell, one end of the reset spring abuts against the inner bottom wall of the shell, and the other end of the reset spring abuts against the lower end face of the bent part; the bending part extending towards the direction of the first metal contact piece is arranged on the second metal contact piece to replace a metal connecting piece, and only one silver contact needs to be arranged on each of the first metal contact piece and the bending part, so that the number of the silver contacts is reduced, and the cost is reduced; the reduction of contact points also reduces the occurrence of poor contact, and the reduction of parts also makes the assembly of the microswitch simpler.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a micro switch. Background Art

[0002] A micro switch is a contact mechanism with a tiny contact spacing and a quick-action mechanism. It uses a specified stroke and a specified force to perform a switching action. Because the contact spacing of the switch is relatively small, it is called a micro switch, also known as a sensitive switch. It is widely used in electronic equipment, instruments, household appliances and other fields, playing an irreplaceable role.

[0003] A micro switch usually includes a housing, a pressing piece, a metal connecting piece, a reset spring and two metal contact pieces. The upper and lower end surfaces of the metal connecting piece are respectively against the pressing piece and the reset spring, and the contact points at both ends of the metal connecting piece are respectively in contact with the contact points of one of the metal contact pieces. By applying a downward force to the pressing piece, the metal connecting piece can be quickly driven downward, so that the contact points at both ends of the metal connecting piece are disconnected from the contact points of the metal contact piece. After the force applied to the pressing piece is withdrawn, the reset spring will drive the pressing piece and the metal connecting piece to reset, so that the contact points at both ends of the metal connecting piece are in contact with the contact points of the metal contact piece again.

[0004] Since the contact points of metal conductors are prone to instantaneous heating and sparks at the moment of contact, the contact points are prone to oxidation and electrolysis during the multi-frequency process. In order to ensure the conductive effect and prevent oxidation, the contact points usually use silver contacts made of silver. However, at present, a total of four silver contacts are set on the metal connecting plate and two metal contact plates of this type of micro switch, which leads to a high cost of the micro switch; and after long-term use, this type of switch is prone to poor contact of the silver contacts, and the setting of too many contact points also makes it more likely to have poor contact. In addition, due to the small size of the micro switch, too many accessories also make it more troublesome to assemble. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a micro switch which is low in cost and convenient to assemble.

[0006] The technical solution of the utility model is to provide a micro switch with the following structure:

[0007] It includes a shell, a first metal contact sheet and a second metal contact sheet, wherein the first metal contact sheet and the second metal contact sheet are respectively arranged at two ends of the inner cavity of the shell; the second metal contact sheet is provided with a bending portion extending in the direction of the first metal contact sheet and having elasticity, and the free end of the bending portion is disconnectably connected to the first metal contact sheet; a pressing piece is provided on the shell, one end of the pressing piece extends into the shell and abuts against the upper end surface of the bending portion, and a return spring is provided in the shell, one end of the return spring abuts against the inner bottom wall of the shell, and the other end abuts against the lower end surface of the bending portion; the pressing piece is used to drive the bending portion to be pressed downward and compress the return spring so that the free end of the bending portion is separated from the contact with the first metal contact sheet; the return spring is used to drive the bending portion and the pressing piece to reset, and make the free end of the bending portion contact with the first metal contact sheet.

[0008] After adopting the above structure, the micro switch of the utility model has the following advantages compared with the prior art:

[0009] The utility model replaces the metal connecting sheet by arranging a bending portion extending toward the first metal contact sheet on the second metal contact sheet, and only needs to arrange one silver contact (contact point) on the first metal contact sheet and the bending portion, thereby reducing the number of silver contacts and achieving the purpose of reducing costs; in addition, since the bending portion and the first metal contact sheet are connected together, a pair of contact points is reduced, and the occurrence of poor contact is also reduced; and the reduction of parts also makes it easier to assemble the micro switch.

[0010] Preferably, two symmetrically arranged first fixing blocks are provided on the inner top wall of the housing, a guide groove is formed between the two first fixing blocks, and the lower end of the pressing member is slidably connected in the guide groove. The guide groove can guide the pressing member to prevent it from deflecting during the pressing process.

[0011] Preferably, the pressing member includes a pressing portion and a driving portion, and a through hole is provided on the outer shell, the inner diameter of the through hole is smaller than the outer diameter of the driving portion and larger than the outer diameter of the pressing portion; the driving portion is arranged in the guide groove and can slide up and down along the guide groove, the pressing portion is connected to the top of the driving portion, and its free end passes through the through hole and extends outside the outer shell.

[0012] Preferably, two symmetrically arranged second fixing blocks are provided on the inner bottom wall of the housing, a limiting groove is formed between the two second fixing blocks, and the lower end of the reset spring is arranged in the limiting groove. The limiting groove can limit the reset spring to prevent its position from being offset.

[0013] Preferably, the outer shell includes a front shell and a rear shell, the first fixing block and the second fixing block are fixedly arranged in the rear shell, and the first fixing block and the second fixing block are respectively provided with a first connecting hole and a second connecting hole, and an end surface of the front shell facing the rear shell is provided with a first connecting column and a second connecting column corresponding to the first connecting hole and the second connecting hole respectively, and the first connecting column and the second connecting column are respectively detachably plugged into the corresponding first connecting hole and the second connecting hole.

[0014] The outer shell is configured as a front shell and a rear shell, which is convenient for assembling the internal parts thereof. The front shell and the rear shell can be quickly disassembled and assembled by cooperating the first connecting column, the second connecting column and the first connecting hole, the second connecting hole.

[0015] Preferably, a mounting hole is provided on the second connecting column, and two ends of the mounting hole respectively penetrate the outer end surfaces of the front shell and the rear shell.

[0016] Preferably, the connection between the second metal contact sheet and the bent portion is arranged in an arc or at a right angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is a partial structural schematic diagram of the utility model.

[0019] Figure 3 It is a structural schematic diagram of the rear shell in the utility model.

[0020] Figure 4 It is a half-section view of the utility model.

[0021] Description of reference numerals:

[0022] 1. Shell, 11. Front shell, 111. First connecting column, 112. Second connecting column, 12. Rear shell, 121. First connecting hole, 122. Second connecting hole, 13. Mounting hole, 2. First metal contact sheet, 3. Second metal contact sheet, 31. Bending portion, 4. Pressing piece, 41. Pressing portion, 42. Driving portion, 5. Reset spring, 6. First fixing block, 61. Guide groove, 7. Second fixing block, 71. Limiting groove. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. At the same time, the terms "first", "second" and the like are only used to distinguish the names of the components, and have no primary or secondary relationship, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown;

[0026] The utility model discloses a micro switch, comprising a shell 1, a first metal contact piece 2 and a second metal contact piece 3. The first metal contact piece 2 and the second metal contact piece 3 are arranged at two ends of an inner cavity of the shell 1 respectively.

[0027] The second metal contact sheet 3 is provided with an elastic bent portion 31 extending toward the first metal contact sheet 2 , and a free end of the bent portion 31 is disconnectably connected to the first metal contact sheet 2 .

[0028] A pressing piece 4 is provided on the shell 1, one end of the pressing piece 4 extends into the shell 1 and abuts against the upper end surface of the bending portion 31, and a return spring 5 is provided in the shell 1, one end of the return spring 5 abuts against the inner bottom wall of the shell 1, and the other end abuts against the lower end surface of the bending portion 31; the pressing piece 4 is used to drive the bending portion 31 to be pressed downward and compress the return spring 5 so that the free end of the bending portion 31 is separated from the contact with the first metal contact sheet 2; the return spring 5 is used to drive the bending portion 31 and the pressing piece 4 to reset and make the free end of the bending portion 31 contact with the first metal contact sheet 2.

[0029] The utility model replaces the metal connecting sheet by providing a bent portion 31 extending toward the first metal contact sheet 2 on the second metal contact sheet 3. Only one silver contact (contact point) needs to be provided on the first metal contact sheet 2 and the bent portion 31, respectively, thereby reducing the number of silver contacts and achieving the purpose of reducing costs.

[0030] In addition, since the bent portion 31 and the first metal contact sheet 2 are connected together, a pair of contact points is reduced, and the occurrence of poor contact is also reduced; and the reduction of parts also makes the micro switch easier to assemble.

[0031] Two symmetrically arranged first fixing blocks 6 are provided on the inner top wall of the housing 1, and a guide groove 61 is formed between the two first fixing blocks 6, and the lower end of the pressing member 4 is slidably connected in the guide groove 61. The guide groove 61 can guide the pressing member 4 to prevent it from deflecting during the pressing process.

[0032] The pressing member 4 includes a pressing portion 41 and a driving portion 42. A through hole is provided on the outer shell 1. The inner diameter of the through hole is smaller than the outer diameter of the driving portion 42 and larger than the outer diameter of the pressing portion 41. The driving portion 42 is arranged in the guide groove 61 and can slide up and down along the guide groove 61. The pressing portion 41 is connected to the top of the driving portion 42, and its free end passes through the through hole and extends to the outside of the outer shell 1.

[0033] Two symmetrically arranged second fixing blocks 7 are provided on the inner bottom wall of the housing 1, and a limiting groove 71 is formed between the two second fixing blocks 7, and the lower end of the reset spring 5 is arranged in the limiting groove 71. The limiting groove 71 can limit the reset spring 5 to prevent its position from being offset.

[0034] The outer shell 1 includes a front shell 11 and a rear shell 12, the first fixing block 6 and the second fixing block 7 are fixedly arranged in the rear shell 12, and the first fixing block 6 and the second fixing block 7 are respectively provided with a first connecting hole 121 and a second connecting hole 122, and an end surface of the front shell 11 facing the rear shell 12 is provided with a first connecting column 111 and a second connecting column 112 which correspond to the first connecting hole 121 and the second connecting hole 122 respectively, and the first connecting column 111 and the second connecting column 112 are respectively detachably inserted into the corresponding first connecting hole 121 and the second connecting hole 122.

[0035] The housing 1 is configured as a front housing 11 and a rear housing 12 to facilitate assembly of internal parts thereof. The front housing 11 and the rear housing 12 can be quickly disassembled and assembled by cooperation between the first connecting column 111, the second connecting column 112 and the first connecting hole 121, the second connecting hole 122.

[0036] The second connecting column 112 is provided with a mounting hole 13, and both ends of the mounting hole 13 respectively penetrate the outer end surfaces of the front shell 11 and the rear shell 12. The mounting hole 13 is provided on the second connecting column 112 and is cocentric with the second connecting column 112, which can reduce the material consumption of the plastic part, thereby reducing the cost.

[0037] The connection (bending point) between the second metal contact sheet 3 and the bending portion 31 is arranged in an arc or a right angle, and can also be chamfered.

[0038] The above description is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A micro switch, comprising a housing (1), a first metal contact sheet (2) and a second metal contact sheet (3), wherein the first metal contact sheet (2) and the second metal contact sheet (3) are respectively arranged at two ends of an inner cavity of the housing (1); characterized in that: The second metal contact sheet (3) is provided with a bending portion (31) extending in the direction of the first metal contact sheet (2) and having elasticity, and the free end of the bending portion (31) is disconnectably connected to the first metal contact sheet (2); the housing (1) is provided with a pressing piece (4), one end of the pressing piece (4) extends into the housing (1) and abuts against the upper end surface of the bending portion (31); a return spring (5) is provided in the housing (1), one end of the return spring (5) abuts against the inner bottom wall of the housing (1), and the other end abuts against the lower end surface of the bending portion (31); the pressing piece (4) is used to drive the bending portion (31) to be pressed downward and compress the return spring (5) so that the free end of the bending portion (31) is separated from the contact with the first metal contact sheet (2); the return spring (5) is used to drive the bending portion (31) and the pressing piece (4) to be reset and to make the free end of the bending portion (31) contact with the first metal contact sheet (2).

2. The micro switch according to claim 1, characterized in that: Two symmetrically arranged first fixing blocks (6) are provided on the inner top wall of the housing (1), a guide groove (61) is formed between the two first fixing blocks (6), and the lower end of the pressing member (4) is slidably connected in the guide groove (61).

3. The micro switch according to claim 2, characterized in that: The pressing member (4) comprises a pressing portion (41) and a driving portion (42); a through hole is provided on the housing (1); the inner diameter of the through hole is smaller than the outer diameter of the driving portion (42) and larger than the outer diameter of the pressing portion (41); the driving portion (42) is arranged in the guide groove (61) and can slide up and down along the guide groove (61); the pressing portion (41) is connected to the top of the driving portion (42), and its free end passes through the through hole and extends to the outside of the housing (1).

4. The micro switch according to claim 3, characterized in that: Two symmetrically arranged second fixing blocks (7) are provided on the inner bottom wall of the housing (1), a limiting groove (71) is formed between the two second fixing blocks (7), and the lower end of the return spring (5) is arranged in the limiting groove (71).

5. The micro switch according to claim 4, characterized in that: The housing (1) comprises a front housing (11) and a rear housing (12); the first fixing block (6) and the second fixing block (7) are fixedly arranged in the rear housing (12); the first fixing block (6) and the second fixing block (7) are respectively provided with a first connecting hole (121) and a second connecting hole (122); an end surface of the front housing (11) facing the rear housing (12) is provided with a first connecting column (111) and a second connecting column (112) which respectively correspond to the first connecting hole (121) and the second connecting hole (122); the first connecting column (111) and the second connecting column (112) are respectively detachably plugged into the corresponding first connecting hole (121) and the second connecting hole (122).

6. The micro switch according to claim 5, characterized in that: The second connecting column (112) is provided with a mounting hole (13), and both ends of the mounting hole (13) respectively penetrate the outer end surfaces of the front shell (11) and the rear shell (12).

7. The micro switch according to claim 1, characterized in that: The connection between the second metal contact sheet (3) and the bent portion (31) is arranged in an arc or at a right angle.

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