CN209895930U - Action assembly of travel switch - Google Patents

Abstract

The utility model provides a travel switch's action subassembly, the contact of having solved current travel switch's action subassembly takes place to damage easily, and life is short, the great problem of volume. The utility model discloses an action subassembly includes casing, ears gasket, contact piece, compressing tightly piece, first terminal, second terminal, third terminal, first square nut, the square nut of second, third square nut, first rivet, H3 overlap joint piece, HP overlap joint piece, bracing piece and fourth spring down. Through the structural design of the action assembly, space factors are fully considered during product design, and the size of the switch is obviously reduced compared with similar products while good insulation and pressure resistance among contacts and between the contacts and the shell are ensured; the travel switch has been strengthened to life's requirement, simultaneously the utility model discloses the contact piece adopts the punching press of stainless steel cold-rolled steel band 07Cr17Ni7Al and bends to make, is difficult to damage, has reduced the defective rate of part production, has practiced thrift the cost.

Description

Action assembly of travel switch

Technical Field

The utility model belongs to the technical field of travel switch, in particular to travel switch's action subassembly.

Background

The contact piece of the action assembly of the existing travel switch is easy to damage, the service life of the whole product is short, and the volume of the existing action assembly is large, so that the whole volume of the travel switch is large.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a contact is not fragile, long service life, small travel switch's action subassembly.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an action assembly of a travel switch comprises a lower shell, a double-lug gasket, a contact piece, a pressing sheet, a first binding post, a second binding post, a third binding post, a first square nut, a second square nut, a third square nut, a first rivet, an H3 lap joint sheet, an HP lap joint sheet, a support rod and a fourth spring; the lower shell is a cylinder with an opening at the upper part, a bulge is formed by extending downwards at the center of the bottom surface of the cylinder, a circular groove is arranged at the center of the bulge, a rectangular limit groove arranged in the vertical direction is arranged below the circular groove, a first boss and a second boss are respectively arranged at two sides in the cylinder, a first binding post and a second binding post are respectively and vertically arranged on the first boss, a third binding post and a first rivet are respectively and vertically arranged on the second boss, 2 circular through holes are arranged on the reversed-U-shaped double-lug gasket, the 2 circular through holes are respectively sleeved on the first binding post and the first rivet, the double-lug gasket is arranged above the first boss and the second boss, a pressing sheet is arranged above the double-lug gasket, the first binding post is screwed and fixed by adopting a first square nut, the first rivet firmly rivets the double-lug gasket and the pressing sheet, an H3 lap joint sheet is arranged on the second binding post and is screwed and fixed by adopting a second square nut, an HP overlapping plate is installed on the third binding post and is screwed and fixed by a third square nut, a gap is formed between the H3 overlapping plate and the HP overlapping plate, and the tail end of the contact plate is installed between the pressing plate and the groove of the inverted U-shaped double-lug gasket; the lower extreme of bracing piece is arranged in the rectangle spacing groove, the upper end of bracing piece is worn out the holding down piece and is blocked by the holding down piece, the bracing piece periphery cover of holding down piece below is equipped with the fourth spring, the tail end and the bracing piece of contact piece are fixed, the bracing piece is along with the reciprocating motion of fourth spring at the inherent vertical direction up-and-down motion of rectangle spacing groove, thereby drive the front end up-and-down motion between H3 overlap joint piece and HP overlap joint piece of contact piece, realize the front end and the contact of H3 overlap joint piece or HP overlap joint piece contact of contact piece.

Furthermore, after the first binding post, the second binding post and the third binding post are respectively screwed with the first square nut, the second square nut and the third square nut, four points are evenly riveted on the end faces of the tail parts of the screws of the first binding post, the second binding post and the third binding post respectively to prevent the nuts from loosening and falling off.

Furthermore, the pressing sheet comprises a T-shaped pressing sheet body, a vertically downward bending body is arranged in the middle of the tail end of the pressing sheet body, a convex block is arranged at the bottom end of the bending body, and a square through hole with a round angle at the inner periphery for the top end of the supporting rod to penetrate out is arranged at the front end of the pressing sheet body;

furthermore, the whole support rod is rectangular plate-shaped, two sides above the rectangular plate are respectively provided with a bulge, a rectangular opening is arranged on the rectangular plate between the two bulges, and the left side and the right side in the rectangular opening are respectively provided with a square groove;

the top end of the supporting rod penetrates through the square through hole of the pressing piece, the pressing piece is arranged above the two bulges, the fourth spring is sleeved on the supporting rod below the two bulges and is vertically arranged in the circular groove of the lower shell together, the lower end of the supporting rod is arranged in the rectangular limiting groove, and the supporting rod moves up and down in the rectangular limiting groove along with the reciprocating motion of the fourth spring in the vertical direction;

furthermore, the contact piece comprises a contact piece body of a rectangular frame body, a first circular through hole is formed in the rear end of the contact piece body, a lug of a pressing piece is arranged in the circular through hole to limit the movement of the contact piece, the middle position of the inner side of the tail end of the contact piece body extends forwards to form a connecting piece in a shape like a Chinese character 'tu', the corresponding positions of the long sides of the two sides of the rectangular frame body are bent twice to form a first bending part and a second bending part, a second circular through hole is formed in the front end of the contact piece body, a second rivet is installed in the second circular through hole, and a protruding part is formed by extending forwards at the middle position of the contact piece body connected with the front end; the lowest point of the first bending part is abutted against the bottom surface of the cylinder body, the top point of the first bending part is abutted against the lower surface of the pressing sheet, the front end of the convex connecting sheet is arranged in a square groove in a rectangular opening of the supporting rod, when the contact sheet is not stressed, the front ends of the second bending part and the contact sheet body are tilted upwards, the front end of the contact sheet body is arranged in a gap between the H3 lap sheet and the HP lap sheet, the second rivet is contacted with the lower surface of the HP lap sheet, the supporting rod is stressed to move downwards, the convex connecting sheet of the supporting rod and the contact sheet body are stressed together, the supporting rod vertically moves downwards in the rectangular limiting groove, the convex connecting sheet is stressed to drive the second bending part and the front end of the contact body to move downwards together, the second rivet at the front end of the contact sheet body is separated from the H3 lap sheet, and the supporting rod moves downwards to the maximum stroke, at the moment, the topmost end of the supporting rod is parallel to the plane of the square through hole in the pressing sheet, and at the moment, the second rivet is in contact with the upper surface of the H3 lapping sheet to complete the switching of the contacts.

Furthermore, the contact piece is made by stamping and bending a stainless steel cold-rolled steel strip 07Cr17Ni7 Al.

Compared with the prior art, the utility model discloses following beneficial effect has: through the structural design of the action assembly, space factors are fully considered during product design, and the size of the switch is obviously reduced compared with similar products while good insulation and pressure resistance among contacts and between the contacts and the shell are ensured; the travel switch has been strengthened to life's requirement, simultaneously the utility model discloses the contact piece adopts the punching press of stainless steel cold-rolled steel band 07Cr17Ni7Al and bends to make, is difficult to damage, has reduced the defective rate of part production, has practiced thrift the cost.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic half-section view of FIG. 1;

FIG. 3 is a schematic view of a contact sheet;

FIG. 4 is a schematic structural view of a compression tab;

FIG. 5 is a schematic view of the support rod;

fig. 6 is a schematic structural diagram of a travel switch to which the present invention is applied;

FIG. 7 is a cross-sectional view of FIG. 6;

FIG. 8 is a schematic structural view of the button assembly;

FIG. 9 is a schematic view of the structure of the button;

FIG. 10 is a schematic structural view of a control cable assembly;

FIG. 11 is a schematic view of the overall construction of the travel switch and control cable assembly;

in the figure: 1-an upper end cover assembly; 2-an action component; 3-fixing the column; 4-lower end cap; 5-a threaded cylinder; 6-a locking assembly; 7-a first O-ring seal; 8-a second O-ring seal; 9-a first cable; 10-a second cable; 11-a third cable;

1-1-upper end cap; 1-2-a button assembly; 1-2-1-button; 1-2-1-1-button housing; 1-2-1-2-collar; 1-2-1-3-slider contact; 1-2-1-4-a first spring; 1-2-1-5-groove; 1-2-2-second spring; 1-2-3-third spring; 1-2-4-liner; 1-2-4-1-annular boss; 1-2-5-locking ring; 1-2-6-internal tooth gasket; 1-2-7-stainless steel gasket; 1-2-8-rubber flat gasket; 1-2-9-sealing gasket; 1-2-10-insulation;

2-1-lower shell; 2-1-1-projection; 2-1-2-circular grooves; 2-1-3-rectangular limiting groove; 2-1-4-a first boss; 2-1-5-a second boss; 2-2-a binaural gasket; 2-3-touch pieces; 2-4-a compression sheet; 2-5-a first terminal post; 2-6-second terminal; 2-7-a third terminal; 2-8-a first square nut; 2-9-a second square nut; 2-10-third square nut; 2-11-a first rivet; 2-12-H3 lap tabs; 2-13-HP lap; 2-14-support bar; 2-15-fourth spring;

2-3-1-contact piece body; 2-3-2- "convex" type connecting piece; 2-3-3-a first bend; 2-3-4-a second bending part; 2-3-5-a second circular through hole; 2-3-6-second rivet; 2-3-7-projection; 2-3-8-a first circular through hole;

2-4-1-T type pressing sheet body; 2-4-2-bending body; 2-4-3-bumps; 2-4-4-square through holes;

2-14-1-projection; 2-14-2-rectangular opening; 2-14-3-square groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

Referring to fig. 1-2, an action assembly of a travel switch, the action assembly 2 comprises a lower shell 2-1, a double-lug gasket 2-2, a contact piece 2-3, a pressing piece 2-4, a first binding post 2-5, a second binding post 2-6, a third binding post 2-7, a first square nut 2-8, a second square nut 2-9, a third square nut 2-10, a first rivet 2-11, an H3 strap 2-12, an HP strap 2-13, a support rod 2-14 and a fourth spring 2-15; the lower shell 2-1 is a cylinder with an opening at the upper part, a convex part 2-1-1 is formed by extending downwards at the center of the bottom surface of the cylinder, a round groove 2-1-2 is arranged at the center of the convex part 2-1-1, a rectangular limit groove 2-1-3 arranged in the vertical direction is arranged below the round groove 2-1-2, a first boss 2-1-4 and a second boss 2-1-5 are respectively arranged at the two sides in the cylinder, a first wiring terminal 2-5 and a second wiring terminal 2-6 are respectively and vertically arranged on the first boss 2-1-4, a third wiring terminal 2-7 and a first rivet 2-11 are respectively and vertically arranged on the second boss 2-1-5, 2 round through holes are arranged on the inverted U-shaped double-lug gasket 2-2, 2 circular through holes are respectively sleeved on a first binding post 2-5 and a first rivet 2-11, a double-lug gasket 2-2 is arranged above a first boss 2-1-4 and a second boss 2-1-5, a pressing sheet 2-4 is arranged above the double-lug gasket 2-2, the first binding post 2-5 is screwed and fixed by adopting a first square nut 2-8, the double-lug gasket 2-2 and the pressing sheet 2-4 are riveted and fixed firmly by the first rivet 2-11, an H3 lapping sheet 2-12 is arranged on a second binding post 2-6 and is screwed and fixed by adopting a second square nut 2-9, an HP lapping sheet 2-13 is arranged on a third binding post 2-7 and is screwed and fixed by adopting a third square nut 2-10, a gap is arranged between the H3 lapping sheet 2-12 and the HP sheet 2-13, the tail end of the contact piece 2-3 is arranged between the pressing piece 2-4 and the groove of the inverted 'U' -shaped double-lug gasket 2-2; the lower ends of the supporting rods 2-14 are arranged in a rectangular limiting groove, the upper ends of the supporting rods 2-14 penetrate through the pressing pieces 2-4 and are clamped by the pressing pieces 2-4, fourth springs 2-15 are sleeved on the peripheries of the supporting rods 2-14 below the pressing pieces 2-4, the tail ends of the contact pieces 2-3 are fixed with the supporting rods 2-14, and the supporting rods 2-14 move up and down in the rectangular limiting groove along with the reciprocating motion of the fourth springs 2-15 in the vertical direction, so that the front ends of the contact pieces 2-3 are driven to move up and down between an H3 lap joint and an HP lap joint, and the front ends of the contact pieces 2-3 are in contact with an H3 lap joint or an HP lap joint.

After the first binding post 2-5, the second binding post 2-6 and the third binding post 2-7 are respectively screwed with the first square nut 2-8, the second square nut 2-9 and the third square nut 2-10, four points are evenly riveted on the end faces of the tail parts of the screws of the first binding post 2-5, the second binding post 2-6 and the third binding post 2-7 respectively to prevent the nuts from loosening and falling off.

Referring to fig. 4, the pressing sheet 2-4 comprises a T-shaped pressing sheet body 2-4-1, a vertically downward bending body 2-4-2 is arranged in the middle of the tail end of the pressing sheet body 2-4-1, a convex block 2-4-3 is arranged at the bottom end of the bending body 2-4-2, and a square through hole 2-4-4 with a round angle on the inner periphery for enabling the top end of a supporting rod 2-14 to penetrate out is arranged at the front end of the pressing sheet body 2-4-1;

referring to fig. 5, the support rod 2-14 is integrally rectangular plate-shaped, the two sides above the rectangular plate are respectively provided with a protrusion 2-14-1, the rectangular plate between the two protrusions 2-14-1 is provided with a rectangular opening 2-14-2, and the left side and the right side in the rectangular opening 2-14-2 are respectively provided with a square groove 2-14-3 with a round angle;

the top end of the supporting rod 2-14 penetrates through a square through hole 2-4-4 of the pressing piece 2-4, the pressing piece 2-4 is arranged above the two bulges 2-14-1, the fourth spring 2-15 is sleeved on the supporting rod 2-14 below the two bulges 2-14-1 and is vertically arranged in the round groove 2-1-2 of the lower shell 2-1 together, the lower end of the supporting rod 2-14 is arranged in the rectangular limiting groove 2-1-3, and the supporting rod 2-14 moves up and down in the rectangular limiting groove 2-1-3 along with the reciprocating motion of the fourth spring 2-15 in the vertical direction;

referring to fig. 3, the contact piece 2-3 comprises a contact piece body 2-3-1 with a rectangular frame body, a first circular through hole 2-3-8 is arranged at the rear end of the contact piece body, a convex block 2-4-3 of a pressing piece is arranged in the circular through hole 2-3-8 to limit the movement of the contact piece, the middle position of the inner side of the tail end of the contact piece body 2-3-1 extends forwards to form a connecting piece 2-3-2 in a shape like a Chinese character 'tu', the corresponding positions of the long sides of the rectangular frame body are bent twice to form a first bent part 2-3-3 and a second bent part 2-3-4, the first bent part 2-3-3 is a linear part inclined towards the lower part of the front end, the second bent part is in a shape like Chinese character 'Λ', and the first bent part, the front end of the contact piece body 2-3-1 is provided with a second circular through hole 2-3-5, a second rivet 2-3-6 is arranged in the second circular through hole 2-3-5, and the middle position of the contact piece body at the front end of the second circular through hole 2-3-5 extends forwards to form a protruding part 2-3-7, so that the contact piece 2-3 is ensured not to generate transverse displacement in the lower shell; the lowest point of the first bending part 2-3-3 is abutted against the bottom surface of the cylinder body, the top point of the first bending part 2-3-3 is abutted against the lower surface of the pressing sheet 2-4, the front end of the convex connecting sheet 2-3-2 is arranged in a square groove in a rectangular opening of the supporting rod, when the button 1-2-1 does not apply pressure, the front ends of the second bending part 2-3-4 and the contact sheet body 2-3-1 are tilted upwards, the front end of the contact sheet body 2-3-1 is arranged in a gap between the H3 lap joint sheet 2-12 and the HP lap joint sheet 2-13, the second rivet 2-3-6 is contacted with the lower surface of the HP lap joint sheet 2-13, the supporting rod is stressed to move downwards, the supporting rod 2-14 is stressed together with the convex connecting sheet 2-3-2 of the contact sheet body 2-3, the support rod 2-14 vertically moves downwards in the rectangular limiting groove 2-1-3, the convex connecting piece 2-3-2 is driven by a downward force to move downwards together with the second bending part 2-3-4 and the front end of the contact body, the second rivet 2-3-6 at the front end of the contact body 2-3-1 is separated from the H3 lap joint piece 2-12, when the support rod moves downwards to the maximum stroke, the topmost end of the support rod 2-14 is parallel to the plane of the square through hole 2-4-4 on the pressing piece 2-4, and at the moment, the second rivet 2-3-6 is in contact with the upper surface of the H3 lap joint piece 2-12 to complete contact switching.

As shown in fig. 6-7, the travel switch using the actuating assembly of the present invention includes an upper end cap assembly, an actuating assembly 2, a fixing column 3, a lower end cap 4, a threaded cylinder 5, and a locking assembly 6; the upper end cover assembly comprises an upper end cover 1-1 and a button assembly 1-2, a through hole is formed in the center of the upper end cover 1-1, the button assembly 1-2 is rolled in the through hole, fixing columns 3 are respectively riveted on two sides of the button assembly 1-2, the fixing columns 3 are arranged in an inner cavity of the upper end cover 1-1, inner threads are arranged on the inner periphery of the upper ends of the fixing columns 3 and are used for being connected with a butt joint piece, outer threads are arranged on the lower ends of the fixing columns 3, the button assembly 1-2 is vertically arranged on the upper end cover 1-1, the action assembly 2 is arranged in the inner cavity of the upper end cover 1-1 (a lower shell 2-1 of the action assembly 2 is arranged in the upper end cover 1-1), the button assembly 1-2 is matched with the action assembly 2 to achieve switching of on-off states of contacts, the lower ends of the two fixing columns 3, the action assembly 2 is clamped and fixed in the upper end cover assembly and the lower end cover 4, the lower ends of the two threaded cylinders 5 are respectively fixed with the lower end cover 4 through the locking assembly 6, and the upper end cover assembly is fixed with the lower end cover 4.

Referring to fig. 8, the button assembly 1-2 includes a button 1-2-1, a second spring 1-2-2, a third spring 1-2-3, a bushing 1-2-4, a locking ring 1-2-5, an internal tooth gasket 1-2-6, a stainless steel gasket 1-2-7, a rubber flat gasket 1-2-8, a sealing gasket 1-2-9, and an insulator 1-2-10;

referring to fig. 9, the button 1-2-1 comprises a button housing 1-2-1-1, a collar 1-2-1-2, a slider contact 1-2-1-3, and a first spring 1-2-1-4; the inner cavity of the button shell 1-2-1-1 is provided with a first spring 1-2-1-4, the lower end of the first spring 1-2-1-4 is sleeved with a sliding block contact body 1-2-1-3, the upper end of the sliding block contact body 1-2-1-3 is arranged in the inner cavity of the button shell 1-2-1-1, the periphery of the lower end of the sliding block contact body 1-2-1-3 is processed into M2 screw threads, an insulating part 1-2-10 is screwed into the lower end of the sliding block contact body 1-2-1-3 through the screw threads to be fixed to play an insulating role of the button, a clamping ring 1-2-1-2 is arranged between the bottom end of the button shell 1-2-1-1 and the sliding block contact body 1-2, the bottom end edge of the button shell 1-2-1-1 is riveted inwards, and the clamping ring 1-2-1-2 supports the sliding block contact body 1-2-1-3 so that the sliding block contact body cannot slide out of the button shell 1-2-1-1;

the button 1-2-1 is vertically arranged in the bushing 1-2-4 with the insulating part 1-2-10 facing downwards, the bushing 1-2-4 is riveted in a through hole of the upper end cover 1-1, the bushing 1-2-4 is internally provided with a second spring 1-2-2 and a third spring 1-2-3 which are concentrically arranged, the second spring 1-2-2 and the third spring 1-2-3 are sleeved on the periphery of the button 1-2-1, the upper end of the periphery of the button shell 1-2-1-1 is provided with a groove 1-2-1-5, an internal tooth gasket 1-2-6 is clamped in the groove 1-2-1-5, the lower surface of the internal tooth gasket 1-2-6 is contacted with the top ends of the second spring 1-2-2 and the third spring 1-2-3, a stainless steel washer 1-2-7 is sleeved on the periphery of a button shell 1-2-1-1 above an internal tooth gasket 1-2-6, an annular boss 1-2-4-1 is arranged on the inner periphery of a bushing 1-2-4, the stainless steel washer 1-2-7 is arranged above the annular boss 1-2-4-1, a rubber flat washer 1-2-8 and a sealing washer 1-2-9 are sequentially arranged above the stainless steel washer 1-2-7, the rubber flat washer 1-2-8 and the sealing washer 1-2-9 are respectively sleeved on the periphery of the button shell 1-2-1-1, a locking ring 1-2-5 is arranged above the sealing washer 1-2-9, the locking ring 1-2-5 is sleeved on the periphery of the button shell 1-2-1-1 and is pressed with the bushing 1-2-4 in an interference manner;

when the button 1-2-1 is pressed downwards, the button 1-2-1 drives the internal tooth gasket 1-2-6 to compress the second spring 1-2-2 and the third spring 1-2-3 downwards, and when the button 1-2-1 is released, the second spring 1-2-2 and the third spring 1-2-3 bounce, so that the button 1-2-1 and the internal tooth gasket 1-2-6 are restored to the original positions;

when the button is pressed downwards, the supporting rod is driven to move downwards, and when the button is released, the supporting rod moves upwards.

Referring to fig. 7, the locking assembly 6 includes a full locking screw 6-1, a flat washer 6-2 and an elastic washer 6-3, a threaded end of the full locking screw 6-1 is vertically installed in the lower end cap 4 and fixes the full locking screw 6-1 with the threaded cylinder 5 in cooperation with the threads of the threaded cylinder 5, and the flat washer 6-2 and the elastic washer 6-3 are installed between the lower end cap 4 and the full locking screw 6-1. And the full locking screw 6-1 is externally fused by a phi 0.5 stainless steel fuse.

Referring to fig. 7, a first O-ring 7 is installed between the upper end cap 1-1 and the lower housing 2-1 of the actuating assembly 2, and a second O-ring 8 is installed between the upper end cap 1-1 and the lower end cap 4.

The contact pieces 2-3 are made by stamping and bending stainless steel cold-rolled steel strips 07Cr17Ni7 Al.

Referring to fig. 7, the bottom end of the lower end cover 4 is further provided with a through hole 4-1 for a cable to pass through.

The stainless steel cold-rolled steel strip 07Cr17Ni7Al for the spring is good in electrical conductivity and elasticity and is suitable for being used as a material of an elastic piece, and the contact pieces 2-3 are subjected to aging treatment after being bent and formed, so that the HV of the part is more than or equal to 360, the contact pieces are guaranteed to have good hardness and elasticity, and the contact pieces are not prone to deformation under stress. The spring leaf adopts circular arc transition corner when bending, avoids the part fracture that hard angle bending caused, improves the yield of part promptly, when can making the switch switching state again, and contact piece deformation atress is more dispersed, does not concentrate on the department of bending a bit, improves the part life-span to promote the whole life-span of product.

The bush 1-2-4 is formed by adding a lead brass bar material machine.

The travel switch of the embodiment belongs to an engine in-place signal judgment device, and is connected with a first cable 9, a second cable 10 and a third cable 11 of a control cable assembly (KZDL195 series control cable) shown in FIG. 10 when in use, the first cable 9, the second cable 10 and the third cable 11 which are respectively connected with pins 1, 2 and 3 penetrate into a lower end cover from a through hole 4-1, and connecting terminals on the first cable 9, the second cable 10 and the third cable 11 are respectively fixed with a first binding post 2-5, a second binding post 2-6 and a third binding post 2-7 through threaded connection:

the utility model discloses travel switch's corresponding wiring point is as shown in table 1:

TABLE 1 corresponding connection points

As shown in the above table, switch contact "O" is the public contact, "H3" is normally open contact, "HP" is normally closed contact, when pressing the utility model discloses a travel switch button is when the biggest stroke, normally closed contact disconnection, and normally open contact switch-on, contact pin "3" and "1" disconnection on the electric connector plug, contact pin "2" and "1" switch-on. When the travel switch button is loosened, the normally open contact is disconnected, the normally closed contact is connected, the contact pin 2 on the plug of the electric connector is disconnected with the contact pin 1, and the contact pin 3 is connected with the contact pin 1. For the action that the button is touched by mistake, when the button moves a small amount of travel by force, the first spring is arranged in the button, the mistaken pressing pressure on a part of the button can be neutralized, the contact piece can not be converted into the contact, when the button is pressed excessively, the first spring in the button can neutralize a part of force, the overtravel protection effect can be achieved, the product can not be damaged, and the performance of the travel switch can not be influenced.

The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims (6)

1. The action assembly of the travel switch is characterized by comprising a lower shell, a double-lug gasket, a contact piece, a pressing sheet, a first binding post, a second binding post, a third binding post, a first square nut, a second square nut, a third square nut, a first rivet, an H3 lapping sheet, an HP lapping sheet, a support rod and a fourth spring; the lower shell is a cylinder with an opening at the upper part, a bulge is formed by extending downwards at the center of the bottom surface of the cylinder, a circular groove is arranged at the center of the bulge, a rectangular limit groove arranged in the vertical direction is arranged below the circular groove, a first boss and a second boss are respectively arranged at two sides in the cylinder, a first binding post and a second binding post are respectively and vertically arranged on the first boss, a third binding post and a first rivet are respectively and vertically arranged on the second boss, 2 circular through holes are arranged on the reversed-U-shaped double-lug gasket, the 2 circular through holes are respectively sleeved on the first binding post and the first rivet, the double-lug gasket is arranged above the first boss and the second boss, a pressing sheet is arranged above the double-lug gasket, the first binding post is screwed and fixed by adopting a first square nut, the first rivet firmly rivets the double-lug gasket and the pressing sheet, an H3 lap joint sheet is arranged on the second binding post and is screwed and fixed by adopting a second square nut, an HP overlapping plate is installed on the third binding post and is screwed and fixed by a third square nut, a gap is formed between the H3 overlapping plate and the HP overlapping plate, and the tail end of the contact plate is installed between the pressing plate and the groove of the inverted U-shaped double-lug gasket; the lower extreme of bracing piece is arranged in the rectangle spacing groove, the upper end of bracing piece is worn out the holding down piece and is blocked by the holding down piece, the bracing piece periphery cover of holding down piece below is equipped with the fourth spring, the tail end and the bracing piece of contact piece are fixed, the bracing piece is along with the reciprocating motion of fourth spring at the inherent vertical direction up-and-down motion of rectangle spacing groove, thereby drive the front end up-and-down motion between H3 overlap joint piece and HP overlap joint piece of contact piece, realize the front end and the contact of H3 overlap joint piece or HP overlap joint piece contact of contact piece.

2. The operating assembly of a travel switch according to claim 1, wherein four points are uniformly riveted on the end surfaces of the tail portions of the screws of the first terminal, the second terminal and the third terminal to prevent the nuts from loosening and falling off after the first terminal, the second terminal and the third terminal are respectively screwed with the first square nut, the second square nut and the third square nut.

3. The stroke switch action assembly according to claim 1, wherein the pressing piece comprises a T-shaped pressing piece body, a vertically downward bending body is arranged in the middle of the tail end of the pressing piece body, a convex block is arranged at the bottom end of the bending body, and a square through hole with a round angle at the inner periphery for the top end of the supporting rod to penetrate out is arranged at the front end of the pressing piece body.

4. The actuating assembly of a limit switch as claimed in claim 1, wherein the support rod has a rectangular plate shape as a whole, the rectangular plate is provided with protrusions at both sides thereof, a rectangular opening is formed in the rectangular plate between the protrusions, and square grooves are formed in the rectangular opening at both left and right sides thereof;

the top end of the supporting rod penetrates out of the square through hole of the pressing piece, the pressing piece is arranged above the two bulges, the fourth spring is sleeved on the supporting rod below the two bulges and is vertically arranged in the circular groove of the lower shell together, the lower end of the supporting rod is arranged in the rectangular limiting groove, and the supporting rod moves up and down in the rectangular limiting groove along with the reciprocating motion of the fourth spring in the vertical direction.

5. The operating assembly of a travel switch according to claim 1, wherein the contact piece comprises a contact piece body of a rectangular frame, the rear end of the contact piece body is provided with a first circular through hole, the protrusion of the pressing piece is arranged in the circular through hole to limit the movement of the contact piece, the middle position of the inner side of the tail end of the contact piece body extends forward to form a connecting piece in a shape like a Chinese character 'tu', the corresponding positions of the long sides of the rectangular frame are bent twice to form a first bent part and a second bent part, the front end of the contact piece body is provided with a second circular through hole, a second rivet is arranged in the second circular through hole, and the middle position of the front end of the second circular through hole, which is connected with the contact piece body, extends forward to form a protruding part to; the lowest point of the first bending part is abutted against the bottom surface of the cylinder body, the top point of the first bending part is abutted against the lower surface of the pressing sheet, the front end of the convex connecting sheet is arranged in a square groove in a rectangular opening of the supporting rod, when the contact sheet is not stressed, the front ends of the second bending part and the contact sheet body are tilted upwards, the front end of the contact sheet body is arranged in a gap between the H3 lap sheet and the HP lap sheet, the second rivet is contacted with the lower surface of the HP lap sheet, the supporting rod is stressed to move downwards, the convex connecting sheet of the supporting rod and the contact sheet body are stressed together, the supporting rod vertically moves downwards in the rectangular limiting groove, the convex connecting sheet is stressed to drive the second bending part and the front end of the contact body to move downwards together, the second rivet at the front end of the contact sheet body is separated from the H3 lap sheet, and the supporting rod moves downwards to the maximum stroke, at the moment, the topmost end of the supporting rod is parallel to the plane of the square through hole in the pressing sheet, and at the moment, the second rivet is in contact with the upper surface of the H3 lapping sheet to complete the switching of the contacts.

6. The operating assembly of a travel switch according to claim 1, wherein said contact plate is stamped and bent from a stainless steel cold rolled strip 07Cr17Ni7 Al.

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