Flat snap-action two-contact travel switch

Abstract

The utility model relates to circuit on, switch technical field provides a kind of flat snap type double-contact travel switch, comprising: shell is equipped with mounting cavity, and middle part is equipped with the through-hole being linked with mounting cavity;Base is buckled in the bottom of shell;Button is worn in the through-hole, side wall is sealedly connected with the inner wall of through-hole, bottom is supported on base by spring;Static contact piece group, symmetrically and fixedly set in the mounting cavity of both sides of through-hole;Dynamic contact piece group, symmetrically and fixedly set in the bottom of button, with button axial reciprocating movement, prompting dynamic contact on dynamic contact piece group respectively with static contact piece on static contact piece group contact and disconnect, realize the on-off of circuit.According to the scheme of the utility model, when pressing button, compression spring, dynamic contact piece group moves downward, dynamic contact and static contact piece disconnect, travel switch circuit breaker, when the pressure of button is removed, the restoring force provided by spring, dynamic contact piece group moves upward with button axial, contact with static contact piece group, realize the connection of circuit.

Description

Technical Field

[0001] This utility model relates to the field of circuit on / off switching technology, and in particular to a flat, snap-fit ​​type double-contact limit switch. Background Technology

[0002] Currently, control systems typically employ single-contact limit switches or contact-type microswitches when pursuing flat limit switches, focusing on meeting on / off requirements within a given size range. However, when pursuing high-reliability limit switches, traditional solutions usually only select larger double-contact or multi-contact limit switches to ensure stable contact and reliable disconnection. Therefore, current solutions still cannot meet the requirements of both flatness and high-reliability on / off switching for limit switches. Thus, to satisfy both requirements, there is an urgent need to design a flat double-contact limit switch that meets both criteria. Utility Model Content

[0003] The purpose of this utility model is to solve at least one technical problem in the background art and to provide a flat snap-fit ​​double contact limit switch.

[0004] To achieve the above objectives, this utility model provides a flat, snap-fit, double-contact limit switch, comprising:

[0005] The outer casing has a mounting cavity, and a through hole in the middle communicating with the mounting cavity;

[0006] The base is fastened to the bottom of the outer casing;

[0007] A button is inserted through the through hole, with its sidewalls sealed to the inner wall of the through hole, and its bottom supported on the base by a spring.

[0008] The stationary contact pieces are symmetrically and fixedly arranged in the mounting cavities on both sides of the through hole;

[0009] The moving contact group is symmetrically and fixedly arranged at the bottom of the button. As the button moves axially back and forth, the moving contacts on the moving contact group contact and disconnect from the stationary contacts on the stationary contact group, thereby realizing the switching on and off of the circuit.

[0010] According to one aspect of the present invention, a boss is provided in the mounting cavity of the housing, a through hole is provided at the center of the boss, and an annular groove is provided on the inner wall of the boss, and a sealing ring is provided in the annular groove for sliding and sealing connection with the outer wall of the button.

[0011] According to one aspect of the present invention, the stationary contact assembly includes: a stationary contact base, an insulating base, two first stationary contacts, and two second stationary contacts;

[0012] The stationary contact plate seat is fixedly installed on the top wall of the mounting cavity, and a mounting hole is provided in the middle of the cavity. The stationary contact plate seat is sleeved on the outer wall of the boss through the mounting hole.

[0013] The bottom of the stationary contact plate holder has four symmetrically bent mounting slots at both ends, and the mounting slots on the same side are symmetrical and connected, respectively used to symmetrically install two first stationary contact plates and two second stationary contact plates;

[0014] The insulating base is a ring frame structure with mating grooves on both sides of its top. The mating grooves engage with the portions of each bent mounting groove near the edge of the stationary contact base to define the positions of each first stationary contact and each second stationary contact.

[0015] Each of the first stationary contact pieces and each of the second stationary contact pieces are symmetrically arranged correspondingly, and each of the first stationary contact pieces and each of the second stationary contact pieces has a first part, a second part and a third part connected in sequence. The second part and the first part are connected end to end to form a horizontal L-shaped structure and are supported in the mounting groove. The third part and the second part are connected end to end to form a vertical L-shaped structure. The third part is located in the mounting cavity and has a hole for welding with the wire.

[0016] According to one aspect of the present invention, the button includes: a pressing part and a connecting part;

[0017] The pressing part passes through the through hole and is slidably connected to the inner wall of the through hole;

[0018] The connecting part is disposed at the bottom of the pressing part, and the outer diameter of the connecting part is smaller than the outer diameter of the pressing part;

[0019] The end of the connecting portion away from the pressing portion is bent outward;

[0020] The pressing part has a spring mounting groove inside, and the spring mounting groove passes through the connecting part;

[0021] One end of the spring is supported in the spring mounting groove, and the other end is supported on the inner wall of the base.

[0022] According to one aspect of the present invention, the movable contact assembly includes: a movable contact base, two movable contacts, four movable contacts, and two rivets;

[0023] The movable contact plate seat is provided with a central hole, which is a stepped hole and includes a first central hole portion and a second central hole portion. The movable contact plate seat is sleeved on the connecting portion through the first central hole portion. The second central hole portion is located on the side of the first central hole portion facing the pressing portion.

[0024] The movable contact holder has symmetrical vertical grooves at both ends. The vertical grooves are stepped grooves, including a first vertical part and a second vertical part. The second vertical part is located on the side of the first vertical part facing the stationary contact group, and the groove width of the second vertical part is greater than the groove width of the first vertical part. The movable contact is supported in the second vertical part. The rivet is set in the first vertical part and the movable contact is fixed in the second vertical part by riveting at both ends.

[0025] Two moving contacts are symmetrically arranged on one moving contact piece, and each moving contact is respectively set to correspond to each stationary contact piece.

[0026] According to one aspect of the present invention, a retaining ring is provided in the second central hole, and the retaining ring is sleeved on the connecting portion;

[0027] The bottom of the movable contact plate seat is provided with a washer, which is fitted onto the outwardly bent part of the end of the connecting part.

[0028] According to one aspect of the present invention, a cylindrical protrusion is provided on the inner wall of the base, the cylindrical protrusion being disposed opposite to the button and used to install the other end of the spring.

[0029] According to one aspect of the present invention, square posts are provided on both sides of the mounting cavity on the outer shell, and threaded holes are provided at the bottom of each square post;

[0030] The base has square mounting ears at both ends, each corresponding to a square post. Each mounting ear has a through stepped hole, which is opposite to the threaded hole. The outer shell and the base are locked together by fastening screws, the through holes, and the threaded hole.

[0031] According to one aspect of the present invention, the housing is further provided with a wire receiving cavity for accommodating wires neatly led out from the mounting cavity, the wire receiving cavity being located outside one of the square posts, the wire receiving cavity surrounding the base from the side, and the bottom inner wall of the wire receiving cavity being sealed to the outer wall of the base by a cover plate.

[0032] According to one aspect of the present invention, an mounting platform is provided on the outer side of the wire receiving cavity, an arc-shaped groove is provided on the mounting platform, a cable clamp is supported on the mounting platform, and an arc-shaped part is provided on the cable clamp, the arc-shaped part cooperating with the arc-shaped groove to fix the wire led out from the wire receiving cavity.

[0033] According to the present invention, when an external force presses the button, the button compresses the spring, and the moving contact group moves axially downward with the button, disconnecting the moving contact from the corresponding stationary contact, thus breaking the circuit with the limit switch. When the pressure of pressing the button is released, the moving contact group moves axially upward with the button through the restoring force provided by the spring, making contact with the stationary contact group, thus connecting the circuit.

[0034] According to the present invention, to ensure the limit switch is waterproof, an annular groove is provided on the wall of the through hole at the top of the housing, and a sealing ring is embedded therein, which slides with the upper part of the button to seal the gap between the button and the through hole at the top of the housing. A base and a cover plate are installed at the bottom of the housing, and the gap is sealed by laser welding.

[0035] According to the present invention, in order to fix and protect the wire, a cable clamp and a mounting platform are provided on the left side of the limit switch, which are fixed and installed with screws so that the wire can be fixed and protected.

[0036] According to the present invention, in order to facilitate the installation of the limit switch, the overall shape is a flat square, and the switch mounting holes are symmetrically distributed on both sides of the lower end of the housing, so that the limit switch can be quickly installed through the switch mounting holes.

[0037] According to the solution of this utility model, the flat, snap-fit ​​double-contact limit switch of this utility model can achieve the following beneficial effects:

[0038] The switch contacts make and break quickly; the contact-type contact enables the moving contact to make and break contact with the stationary contact instantaneously when the moving contact moves axially.

[0039] The switch contacts have high reliability, and the double sets of contacts ensure the reliability of circuit switching, and have strong vibration resistance.

[0040] It has rainproof and sealing properties;

[0041] The switch has a compact structure and small size;

[0042] The switch is easy to install, as it is mounted through the four switch mounting holes on the housing.

[0043] It has good versatility and is suitable for various control systems with small installation space and high requirements for the switching performance of electrical circuits. Attached Figure Description

[0044] Figure 1 A perspective view schematically illustrating a flattened snap-fit ​​double-contact limit switch according to one embodiment of the present invention;

[0045] Figure 2 This schematic diagram shows a cross-sectional view of a flat, snap-fit ​​type double-contact limit switch according to one embodiment of the present invention.

[0046] Figure 3 This schematic diagram shows a cross-sectional view of a static contact assembly according to one embodiment of the present invention.

[0047] Figure 4 illustrative representation Figure 3 AA section view in the middle;

[0048] Figure 5 A schematic cross-sectional view illustrating the mating structure of a button and movable contact assembly according to one embodiment of the present invention;

[0049] Figure 6 This schematic diagram shows a cross-sectional view of the moving contact assembly according to one embodiment of the present invention.

[0050] Figure 7 This schematic diagram shows a front view of the structure of a movable contact piece according to one embodiment of the present invention.

[0051] Figure 8 The schematic diagram shows a top view of the structure of the movable contact piece according to one embodiment of the present invention. Detailed Implementation

[0052] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the present invention, and are not intended to imply any limitation on the scope of the present invention.

[0053] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".

[0054] Figure 1 A perspective view schematically illustrating a flattened snap-fit ​​double-contact limit switch according to one embodiment of the present invention; Figure 2 This schematic diagram shows a cross-sectional view of a flattened, snap-fit, double-contact limit switch according to one embodiment of the present invention. Figure 1 and Figure 2 As shown, in this embodiment, the flat-type snap-fit ​​double-contact limit switch includes:

[0055] The outer casing 1 has a mounting cavity 6 and a through hole 7 in the middle that communicates with the mounting cavity;

[0056] Base 2 is fastened to the bottom of outer shell 1;

[0057] Button 3 is inserted through the through hole 7, with its side wall sealed to the inner wall of the through hole 7, and its bottom supported on the base 2 by a spring 8;

[0058] The stationary contact plate group 4 is symmetrically and fixedly arranged in the mounting cavity 6 on both sides of the through hole 7;

[0059] The moving contact group 5 is symmetrically and fixedly arranged at the bottom of the button 3. As the button 3 moves axially back and forth, the moving contacts on the moving contact group 5 contact and disconnect with the stationary contacts on the stationary contact group 4 respectively, so as to realize the circuit switching.

[0060] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the mounting cavity 6 of the outer shell 1 is provided with a boss 9, the center of the boss 9 is provided with the aforementioned through hole 7, and the inner wall of the boss 9 is provided with an annular groove 10, in which a sealing ring 11 is provided that slides and seals with the outer wall of the button.

[0061] Furthermore, Figure 3 This schematic diagram shows a cross-sectional view of a static contact assembly according to one embodiment of the present invention. Figure 4 illustrative representation Figure 3 AA section view in the image. Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the stationary contact assembly 4 includes: a stationary contact base 12, an insulating base 13, two first stationary contacts 14, and two second stationary contacts 15;

[0062] The stationary contact plate seat 12 is fixedly installed on the top wall of the mounting cavity 6, and a mounting hole 16 is provided in the middle. The stationary contact plate seat 12 is sleeved on the outer wall of the boss 9 through the mounting hole 16.

[0063] The bottom of the stationary contact plate holder 12 has four symmetrically bent mounting slots 17 at both ends, and as shown in the figure. Figure 4 As shown, the mounting slots 17 on the same side are symmetrical and connected, and are used to symmetrically install two first stationary contact pieces and two second stationary contact pieces respectively;

[0064] The insulating base 13 is an annular frame structure with mating grooves (not shown in the figure) on both sides of its top. The mating grooves cooperate with the portions of each bent mounting groove 17 near the edge of the stationary contact base 12 to define the positions of each first stationary contact 14 and each second stationary contact 15.

[0065] Each first stationary contact 14 and each second stationary contact 15 are symmetrically arranged correspondingly, and each first stationary contact 14 and each second stationary contact 15 has a first part 18, a second part 19 and a third part 20 connected in sequence. The second part 19 and the first part 18 are connected end to end to form a horizontal L-shaped structure and are supported in the mounting groove. The third part 20 and the second part 19 are connected end to end to form a vertical L-shaped structure. The third part 20 is located in the mounting cavity 6 and has a hole for welding with the wire.

[0066] Furthermore, Figure 5 This schematic diagram illustrates a cross-sectional view of the button and movable contact assembly structure according to one embodiment of the present invention. Figure 2 and Figure 5 As shown, in this embodiment, button 3 includes: a pressing part 21 and a connecting part 22;

[0067] The pressing part 21 passes through the through hole 7 and is slidably connected to the inner wall of the through hole 7;

[0068] The connecting part 22 is provided at the bottom of the pressing part 21, and the outer diameter of the connecting part 22 is smaller than the outer diameter of the pressing part 21;

[0069] The end of the connecting part 22 away from the pressing part 21 is bent outward;

[0070] The pressing part 21 has a spring mounting groove 23 inside, and the spring mounting groove 23 passes through the connecting part 22;

[0071] One end of the spring 8 is supported in the spring mounting groove 23, and the other end is supported on the inner wall of the base 2.

[0072] Furthermore, Figure 6 This schematic diagram shows a cross-sectional view of the moving contact assembly according to one embodiment of the present invention. Figure 2 , Figure 5 and Figure 6 As shown, in this embodiment, the movable contact assembly 5 includes: a movable contact base 24, two movable contacts 25, four movable contacts 26, and two rivets 27;

[0073] The movable contact plate seat 24 is provided with a central hole 28, which is a stepped hole and includes a first central hole portion 29 and a second central hole portion 30. The movable contact plate seat 24 is sleeved on the connecting portion 22 through the first central hole portion 29; the second central hole portion 30 is located on the side of the first central hole portion 29 facing the pressing portion 21.

[0074] The movable contact base 24 has symmetrical through vertical grooves 31 at both ends. The vertical grooves 31 are stepped grooves, including a first vertical part 32 and a second vertical part 33. The second vertical part 33 is located on the side of the first vertical part 32 facing the stationary contact group 4, and the groove width of the second vertical part 33 is greater than the groove width of the first vertical part 32. The movable contact 25 is supported in the second vertical part 33. Rivets are set in the first vertical part 32, and the movable contact 25 is fixed in the second vertical part 33 by riveting at both ends.

[0075] Two moving contacts 26 are symmetrically arranged on one moving contact piece 25, and each moving contact 26 is respectively set to correspond to each stationary contact piece (first stationary contact piece 14 and second stationary contact piece 15).

[0076] In this embodiment, the structure of the moving contact is as follows: Figure 7 and Figure 8 As shown, the moving contact 25 is a rectangular plate structure with its middle section bent to raise both ends. Connecting holes 34 are provided at the center and both ends. T-shaped moving contacts 26 pass through the connecting holes 34 at both ends and are fixed to both ends of the moving contact 25 by riveting, forming a circuit with the two stationary contacts. Rivets 27 fix the moving contact 25 through the central connecting hole 34.

[0077] In this embodiment, the stationary contact plate seat 12 is symmetrically arranged with clearance holes 35 on the left and right sides. Each clearance hole 35 is coaxial with the rivet 27 of the moving contact plate group 5 to avoid interference between the stationary contact plate group 4 and the moving contact plate group 5 when the moving contact plate group 5 moves.

[0078] Furthermore, such as Figure 2 and Figure 5 As shown, in this embodiment, a retaining ring 36 is provided in the second central hole 30, and the retaining ring 36 is sleeved on the connecting part 22;

[0079] The bottom of the movable contact plate seat 24 is provided with a washer 37, which is fitted onto the outward bend at the bottom of the connecting part 22.

[0080] Furthermore, such as Figure 2 As shown, in this embodiment, a cylindrical protrusion 38 is provided on the inner wall of the base 2. The cylindrical protrusion 38 is positioned opposite to the button 3 and is used to mount the bottom end of the spring 8. The cylindrical protrusion 38 fixes the position and axial movement of the spring 8, preventing the spring 8 from tilting and causing uneven pressing.

[0081] Furthermore, such as Figure 2 As shown, in this embodiment, square posts 39 are provided on both sides of the mounting cavity 6 on the outer shell 1, and each square post 39 is provided with a threaded hole 40 at its bottom.

[0082] The base 2 has square mounting ears 41 at both ends, which correspond to each square column. Each square mounting ear 41 has a through stepped hole 42. The stepped hole 42 is opposite to the threaded hole 40. The outer shell 1 and the base 2 are connected and locked by the cooperation of the fastening screw 43, the stepped hole 42 and the threaded hole 40.

[0083] Furthermore, such as Figure 2As shown, in this embodiment, the outer casing also has a wire receiving cavity 44 for accommodating and neatly accommodating the wires led out from the mounting cavity. The wire receiving cavity 44 is located outside the left square post 39 and surrounds the base 2 from the side. The bottom inner wall of the wire receiving cavity 44 is sealed to the outer wall of the base 2 by a cover plate 45. In this embodiment, the cover plate 45 has a groove (not shown in the figure). The groove is located away from the square mounting ear 41 of the base, which facilitates the neat handling of the wire harness and the sealing of the wire lead-out end inside the casing. After the cover plate 45 is closed, the bottom gap of the limit switch is filled by laser welding to achieve the overall rainproof function of the switch.

[0084] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, a mounting platform 46 is provided on the outside of the wire receiving cavity 44. An arc-shaped groove 47 is provided on the mounting platform 46. A cable clamp 48 is supported on the mounting platform 46. An arc-shaped part 49 is provided on the cable clamp 48. The arc-shaped part 49 and the arc-shaped groove 47 cooperate to fix the wires led out from the wire receiving cavity 44. The cable clamp 48 and the mounting platform 46 are locked together by screws 50.

[0085] According to the above-mentioned solution of this utility model, when an external force presses the button 3, the button 3 compresses the spring 8, and the moving contact group 5 moves downward along the button axis. The moving contact disconnects from the corresponding stationary contact, and the limit switch breaks the circuit. When the pressure of pressing the button 3 is released, the moving contact group moves upward along the button axis through the restoring force provided by the spring 8, and contacts the stationary contact group to realize the connection of the circuit.

[0086] According to the above-described solution of this utility model, in order to ensure that the limit switch is waterproof, an annular groove 10 is provided on the wall of the through hole at the top of the housing, and a sealing ring 11 is embedded therein, which slides with the upper part of the button 3 to seal the gap between the button 3 and the through hole at the top of the housing 1. A base 2 and a cover plate 45 are installed at the bottom of the housing 1, and the gap is sealed by laser welding.

[0087] According to the above-described solution of this utility model, in order to fix and protect the wire, a cable clamp 48 and a mounting platform 46 are provided on the left side of the limit switch, which are fixed and installed with screws so that the wire can be fixed and protected.

[0088] According to the above-mentioned solution of this utility model, in order to facilitate the installation of the limit switch, the whole is flat and square, and the switch mounting holes 51 are symmetrically distributed on both sides of the lower end of the housing, so that the quick-closing limit switch can be installed through the switch mounting holes 51.

[0089] According to the above-described solution of this utility model, the flat, snap-fit, double-contact limit switch of this utility model can achieve the following beneficial effects:

[0090] The switch contacts make and break quickly; the contact-type contact enables the moving contact to make and break contact with the stationary contact instantaneously when the moving contact moves axially.

[0091] The switch contacts have high reliability, and the double sets of contacts ensure the reliability of circuit switching, and have strong vibration resistance.

[0092] It has rainproof and sealing properties;

[0093] The switch has a compact structure and small size (50mm×17.8mm×12mm).

[0094] The switch is easy to install, as it is mounted through the four switch mounting holes on the housing.

[0095] It has good versatility and is suitable for various control systems with small installation space and high requirements for the switching performance of electrical circuits.

[0096] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A flat snap-action two-contact travel switch characterized in that, include: The outer casing has a mounting cavity, and a through hole in the middle communicating with the mounting cavity; The base is fastened to the bottom of the outer casing; A button is inserted through the through hole, with its sidewalls sealed to the inner wall of the through hole, and its bottom supported on the base by a spring. The stationary contact pieces are symmetrically and fixedly arranged in the mounting cavities on both sides of the through hole; The moving contact group is symmetrically and fixedly arranged at the bottom of the button. As the button moves axially back and forth, the moving contacts on the moving contact group contact and disconnect from the stationary contacts on the stationary contact group, thereby realizing the switching on and off of the circuit.

2. The flattened snap-action dual-contact travel switch of claim 1, wherein, The mounting cavity of the outer casing is provided with a boss, the center of the boss is provided with a through hole, and the inner wall of the boss is provided with an annular groove, and a sealing ring is provided in the annular groove for sliding and sealing connection with the outer wall of the button.

3. The flattened snap-action dual-contact travel switch of claim 2, wherein, The stationary contact assembly includes: a stationary contact base, an insulating base, two first stationary contacts, and two second stationary contacts; The stationary contact plate seat is fixedly installed on the top wall of the mounting cavity, and a mounting hole is provided in the middle of the cavity. The stationary contact plate seat is sleeved on the outer wall of the boss through the mounting hole. The bottom of the stationary contact plate holder has four symmetrically bent mounting slots at both ends, and the mounting slots on the same side are symmetrical and connected, respectively used to symmetrically install two first stationary contact plates and two second stationary contact plates; The insulating base is a ring frame structure with mating grooves on both sides of its top. The mating grooves engage with the portions of each bent mounting groove near the edge of the stationary contact base to define the positions of each first stationary contact and each second stationary contact. Each of the first stationary contact pieces and each of the second stationary contact pieces are symmetrically arranged correspondingly, and each of the first stationary contact pieces and each of the second stationary contact pieces has a first part, a second part and a third part connected in sequence. The second part and the first part are connected end to end to form a horizontal L-shaped structure and are supported in the mounting groove. The third part and the second part are connected end to end to form a vertical L-shaped structure. The third part is located in the mounting cavity and has a hole for welding with the wire.

4. The flattened snap-action dual-contact travel switch of claim 1, wherein, The button includes: a pressing part and a connecting part; The pressing part passes through the through hole and is slidably connected to the inner wall of the through hole; The connecting part is disposed at the bottom of the pressing part, and the outer diameter of the connecting part is smaller than the outer diameter of the pressing part; The end of the connecting portion away from the pressing portion is bent outward; The pressing part has a spring mounting groove inside, and the spring mounting groove passes through the connecting part; One end of the spring is supported in the spring mounting groove, and the other end is supported on the inner wall of the base.

5. The flattened snap-action dual-contact travel switch of claim 4, wherein, The movable contact assembly includes: a movable contact base, two movable contacts, four movable contacts, and two rivets; The movable contact plate seat is provided with a central hole, which is a stepped hole and includes a first central hole portion and a second central hole portion. The movable contact plate seat is sleeved on the connecting portion through the first central hole portion. The second central hole portion is located on the side of the first central hole portion facing the pressing portion. The movable contact holder has symmetrical vertical grooves at both ends. The vertical grooves are stepped grooves, including a first vertical part and a second vertical part. The second vertical part is located on the side of the first vertical part facing the stationary contact group, and the groove width of the second vertical part is greater than the groove width of the first vertical part. The movable contact is supported in the second vertical part. The rivet is set in the first vertical part and the movable contact is fixed in the second vertical part by riveting at both ends. The two moving contacts are symmetrically arranged on one moving contact piece, and each moving contact is respectively set to correspond to each stationary contact piece.

6. The flattened snap-action dual-contact travel switch of claim 5, wherein, A retaining ring is provided in the second central hole, and the retaining ring is sleeved on the connecting part; The bottom of the movable contact plate seat is provided with a washer, which is fitted onto the outwardly bent part of the end of the connecting part.

7. The flattened snap-action dual-contact travel switch of claim 1, wherein, The inner wall of the base is provided with a cylindrical protrusion, which is positioned opposite to the button and is used to install the other end of the spring.

8. The flattened, snap-action, dual-contact travel switch of claim 1, wherein, The outer shell has square posts on both sides of the mounting cavity, and each square post has a threaded hole at its bottom; The base has square mounting ears at both ends, each corresponding to a square post. Each square mounting ear has a through stepped hole. The through stepped hole is opposite to the threaded hole. The outer shell and the base are locked together by fastening screws, the through stepped hole and the threaded hole.

9. The flattened snap-action dual-contact travel switch of claim 8, wherein, The housing also has a wire receiving cavity for accommodating wires neatly led out from the mounting cavity. The wire receiving cavity is located outside one of the square pillars and surrounds the base from the side. The bottom inner wall of the wire receiving cavity is sealed to the outer wall of the base by a cover plate.

10. The flat snap-action double-contact travel switch according to claim 9, characterized in that An installation platform is provided on the outside of the wire receiving cavity. An arc-shaped groove is provided on the installation platform. A cable clamp is supported on the installation platform. An arc-shaped part is provided on the cable clamp. The arc-shaped part cooperates with the arc-shaped groove to fix the wire led out from the wire receiving cavity.

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