A microswitch with adjustable acting force

Abstract

The present invention relates to a microswitch with adjustable acting force. One end of a beryllium copper elastic piece is provided with a common terminal contact. The other end of the beryllium copper elastic piece is a large arm of the beryllium copper elastic piece for applying acting force to a thimble. Both sides of the large arm of the beryllium copper elastic piece are elastic piece end faces. The end of the large arm of the beryllium copper elastic piece is fixedly arranged between two fulcrum brackets. The two elastic piece end faces are abutted against fulcrum card slots on one end face of the corresponding fulcrum brackets. A normally closed contact is arranged above the common terminal contact, and a normally open contact is arranged below the common terminal contact. Its advantages are as follows: The end of the fulcrum bracket in contact with the elastic piece end face is provided with vertically arranged fulcrum card slots, and the position of the fulcrum card slot contacted by the elastic piece end face is adjusted according to the elastic force required in actual use.

Description

Technical Field

[0001] The present invention belongs to the field of switches and relates to a microswitch with adjustable acting force. Background Art

[0002] A microswitch is a very widely used switch in the field of control applications, with a simple structure and reliable use. In order to ensure reliable switching contact between the common terminal contact and the normally open contact and the normally closed contact after the ejector pin applies a force to the large arm of the beryllium copper elastic sheet, the end face of the elastic sheet and the fixed point of the large arm of the elastic sheet need to be on the same horizontal plane. After the force applied by the ejector pin to the large arm of the beryllium copper elastic sheet disappears, the beryllium copper elastic sheet can provide a force of 0.7 - 0.9 N to make the common terminal contact and the normally closed contact in contact.

[0003] In existing products, when used in places with external force impact, the beryllium copper elastic sheet cannot provide a greater force to drive the common terminal contact and the normally closed contact to contact reliably. When the common terminal contact and the normally open contact are in contact, the hardness of the large arm of the beryllium copper elastic sheet is insufficient to withstand the force applied by the ejector pin. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art and propose a microswitch with adjustable acting force.

[0005] To achieve the above purpose, the present invention adopts the following technical solution: A microswitch with adjustable acting force includes a beryllium copper elastic sheet, a fulcrum bracket, a normally open contact, a normally closed contact, and a common terminal contact. One end of the beryllium copper elastic sheet is provided with a common terminal contact, and the other end of the beryllium copper elastic sheet is the large arm of the beryllium copper elastic sheet to which the ejector pin applies a force. The two sides of the large arm of the beryllium copper elastic sheet are the end faces of the elastic sheet. The end of the large arm of the beryllium copper elastic sheet is fixedly arranged between two fulcrum brackets. The two end faces of the elastic sheet are abutted against the fulcrum slots at one end face of the corresponding fulcrum brackets. A normally closed contact is arranged above the common terminal contact, and a normally open contact is arranged below the common terminal contact;

[0006] The fulcrum bracket includes a horizontal section and a vertical section. The end of the horizontal section facing the end face of the elastic sheet is connected to the vertical section to form an L shape. The two fulcrum brackets are arranged in parallel. The ends of the two horizontal sections are fixed to the end of the large arm of the beryllium copper elastic sheet through a connecting plate and a bolt; Several vertically arranged fulcrum slots are provided on the side of the vertical section facing the end face of the elastic sheet, and the end face of the elastic sheet selects the corresponding fulcrum slot according to the actual required elastic force.

[0007] Further, a reinforcing arm covering the point where the large arm of the beryllium copper elastic sheet is applied with a force by the ejector pin is arranged above the end of the large arm of the beryllium copper elastic sheet.

[0008] Further, the reinforcing arm is sleeved on the end of the large arm of the beryllium copper elastic sheet.

[0009] Further, one end of the reinforcing arm is fixed to the end of the large arm of the beryllium copper elastic sheet.

[0010] The beneficial effects of the present invention are as follows: first, a vertically arranged fulcrum slot is provided at one end of the fulcrum bracket that contacts the end face of the spring sheet, and the position of the fulcrum slot that contacts the end face of the spring sheet can be adjusted according to the elastic force provided in actual needs.

[0011] Secondly, a reinforcing arm is arranged on the outside of the end of the beryllium copper shrapnel arm. The ejector applies force on the reinforcing arm, and the reinforcing arm applies force on the beryllium copper shrapnel arm, thereby changing the force point and force stroke of the beryllium copper shrapnel arm. There is a force large enough to separate the common end contact from the normally closed contact and to make the common end contact contact with the normally open contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the invention.

[0013] 1 is a beryllium copper shrapnel; 2 is a fulcrum bracket; 3 is a normally open contact; 4 is a normally closed contact; 5 is a ejector pin; 6 is a reinforcing arm; 12 is a beryllium copper shrapnel arm; 13 is a shrapnel end face; 11 is a common terminal contact; 14 is the end of the beryllium copper shrapnel arm; 21 is a fulcrum slot; 22 is a horizontal section; 23 is a vertical section; 31 is a normally open contact bracket; 41 is a normally closed contact bracket. DETAILED DESCRIPTION

[0014] The following will be combined with the attached embodiment of the present invention Figure 1 , the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0015] Example 1 Reference Figure 1 A micro switch with adjustable force comprises a beryllium copper shrapnel 1, a fulcrum bracket 2, a normally open contact 3, a normally closed contact 4 and a common end contact 11. The common end contact 11 is provided at one end of the beryllium copper shrapnel 1, and the other end of the beryllium copper shrapnel 1 is a beryllium copper shrapnel arm 12 on which a pin 5 applies force. Both sides of the beryllium copper shrapnel arm 12 are shrapnel end faces 13. The end of the beryllium copper shrapnel arm 12 is fixedly arranged between two fulcrum brackets 2, and the two shrapnel end faces 13 are against the fulcrum card slot 21 of one end face of the corresponding fulcrum bracket. A normally closed contact 4 is provided above the common end contact 11, and a normally open contact 3 is provided below the common end contact 11.

[0016] A micro switch with adjustable force, the fulcrum bracket includes a horizontal section 22 and a vertical section 23, the horizontal section is connected to the vertical section towards the end face of the spring piece to form an L shape, the two fulcrum brackets are arranged in parallel, the beryllium copper spring piece upper arm end 14 is fixed between the two horizontal sections by a connecting plate and bolts; the vertical section is provided with a plurality of vertically arranged fulcrum slots towards the end face of the spring piece. The spring piece end face selects the corresponding fulcrum slot according to the elastic force actually required to be provided.

[0017] A microswitch with adjustable acting force, and the normally-closed contact 4 is arranged above the common terminal contact through the normally-closed contact bracket 41.

[0018] A microswitch with adjustable acting force, and the normally-open contact 3 is arranged below the common terminal contact through the normally-open contact bracket 31.

[0019] A microswitch with adjustable acting force, and a reinforcing arm 6 covering the acting force point of the beryllium copper spring arm applied by the ejector pin is arranged above the end of the beryllium copper spring arm.

[0020] A microswitch with adjustable acting force, and the reinforcing arm is sleeved on the end of the beryllium copper spring arm.

[0021] A microswitch with adjustable acting force, and one end of the reinforcing arm is fixed to the end of the beryllium copper spring arm through a connecting plate and a bolt.

[0022] A microswitch with adjustable acting force, and one end of the reinforcing arm is fixed to the end of the beryllium copper spring arm in a snap-fastening manner.

[0023] A microswitch with adjustable acting force, and one end of the reinforcing arm is fixed to the end of the beryllium copper spring arm through other existing structures.

[0024] A microswitch with adjustable acting force, in the same environment, the farther the distance between the end face of the spring piece and the horizontal plane of the fixed point of the spring arm, the greater the acting force exerted by the common terminal contact on the normally-closed contact. Therefore, we set the fulcrum bracket into an L shape, arrange a number of vertically arranged fulcrum slots at the end in contact with the end face of the spring piece of the fulcrum bracket, and select the position of the fulcrum slot matching the end face of the spring piece according to the required elastic force in actual needs.

[0025] A microswitch with adjustable acting force, a reinforcing arm is arranged at the position of the acting force point of the ejector pin on the beryllium copper spring arm, changing the acting force point and acting force stroke of the beryllium copper spring arm, so that the beryllium copper spring arm has a large enough acting force to separate the common terminal contact from the normally-closed contact, and make the common terminal contact contact with the normally-open contact. It will not cause the problem that the beryllium copper spring arm bends due to insufficient stress of the beryllium copper spring arm to offset the acting force generated by the beryllium copper spring piece.

[0026] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A micro switch with adjustable force, comprising a beryllium copper spring, a fulcrum bracket, a normally open contact, a normally closed contact and a common terminal contact, characterized in that: A common terminal contact is arranged at one end of the beryllium copper shrapnel, and a beryllium copper shrapnel arm to which the ejector pin applies force is arranged at the other end of the beryllium copper shrapnel. Both sides of the beryllium copper shrapnel arm are shrapnel end faces. The end of the beryllium copper shrapnel arm is fixedly arranged between two fulcrum brackets, and the two shrapnel end faces are against the fulcrum card slots of one end face of the corresponding fulcrum bracket. A normally closed contact is arranged above the common terminal contact, and a normally open contact is arranged below the common terminal contact. The fulcrum bracket includes a horizontal section and a vertical section. The horizontal section is connected to the vertical section toward the end face of the spring piece to form an L shape. The two fulcrum brackets are arranged in parallel. The end of the beryllium copper spring arm is fixed between the two horizontal sections by a connecting plate and a bolt. The vertical section is provided with a plurality of vertically arranged fulcrum slots toward the end face of the spring piece. The spring piece end face selects the corresponding fulcrum slot according to the elastic force actually required to be provided. A reinforcing arm is arranged above the end of the beryllium copper shrapnel arm and covers the point where the beryllium copper shrapnel arm is applied with a force by the ejector pin.

2. A micro switch with adjustable force according to claim 1, characterized in that: The reinforcing arm is sleeved on the end of the beryllium copper shrapnel arm.

3. The micro switch with adjustable force according to claim 1, characterized in that: One end of the reinforcing arm is fixed to the end of the large arm of the beryllium copper shrapnel.

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