Large-stroke protection type microswitch

Abstract

The utility model relates to a large-stroke protection type microswitch, which comprises a shell and is characterized in that a button is arranged on the microswitch; one end of the push rod directly faces a button of the microswitch body, the push rod is sleeved with a first elastic piece, a contact section is arranged on the side, facing the microswitch body, of the push rod, and one end of the first elastic piece abuts against the contact section; the second elastic piece is sleeved on the first elastic piece; one end of the transmission rod penetrates through the shell and is coaxial with the push rod, the end, facing the push rod, of the transmission rod abuts against one end of the first elastic piece and one end of the second elastic piece, the end, facing the transmission rod, of the push rod can slidably stretch into the transmission rod, and the transmission rod is used for pushing the push rod to move towards the microswitch body; the support is arranged between the microswitch body and the push rod, one end, opposite to the transmission rod, of the second elastic piece abuts against the support, and the microswitch has the advantages that external impact force cannot be directly transmitted to the microswitch body, the microswitch is protected, and the service life of the microswitch is prolonged.

Description

Technical Field

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

[0002] A micro switch is a switch with a small contact spacing and a snap-action mechanism. It uses a specified stroke and a specified force to perform a switching action. It is covered with a shell and has a transmission element on the outside. Because the contact spacing of the switch is relatively small, it is called a micro switch. As a high-precision and high-reliability switching device, the micro switch has been widely used in many fields such as aviation, automobiles, home appliances, and industrial control.

[0003] In existing micro switches, external mechanical force usually directly acts on the inside of the micro switch through a transmission element, so that the moving contact and the static contact inside the micro switch are turned on or off to realize the switching function.

[0004] When the external impact force is large, the impact force will be directly transmitted to the inside of the micro switch. After long-term use, the micro switch will be damaged and the service life of the micro switch will be affected. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a large-stroke protection type micro switch to solve the technical problems in the prior art that the impact force is large, the micro switch is damaged, and the service life of the micro switch is affected.

[0006] The utility model provides a large-stroke protection type micro switch, comprising:

[0007] The shell body is hollow inside;

[0008] A micro switch body is arranged inside the housing, and a button for controlling the opening and closing of the micro switch is arranged on the micro switch;

[0009] A push rod, one end of which is directly facing the button of the micro switch body, a first elastic member is sleeved on the push rod, the first elastic member and the push rod are coaxial, a contact section is arranged on the side of the push rod facing the micro switch body, and one end of the first elastic member is in contact with the contact section;

[0010] a second elastic member, sleeved on the first elastic member, the first elastic member and the second elastic member are coaxially arranged, and the elastic coefficient of the first elastic member is smaller than the elastic coefficient of the second elastic member;

[0011] A transmission rod is coaxial with the push rod and one end of the transmission rod is inserted into the housing, one end of the transmission rod facing the push rod contacts one end of the first elastic member facing away from the contact section, one end of the transmission rod facing the push rod contacts one end of the second elastic member, one end of the push rod facing the transmission rod can slide into the interior of the transmission rod, and the transmission rod is used to push the push rod to move toward the micro switch body;

[0012] The bracket is arranged between the micro switch body and the push rod, the second elastic member is in contact with the bracket at one end facing away from the transmission rod, and the contact section is slidably arranged on the bracket.

[0013] Optionally, a sealing member is provided at the gap between the transmission rod and the housing for sealing between the transmission rod and the housing.

[0014] Optionally, the sealing member comprises a bellows sleeved on the surface of the transmission rod, one end of the bellows is sealingly connected to the side wall of the transmission rod, and the other end is sealingly connected to the inner wall of the housing located at the transmission rod.

[0015] Optionally, a push plate is provided at the micro switch body, and the push plate is connected to the outer wall of the micro switch body through a third elastic member. When the contact section moves to the push plate, the contact section pushes the push plate to move toward the button until the push plate presses the button.

[0016] Optionally, a retaining ring is sleeved on the push rod, and the retaining ring is located between the transmission rod and the first elastic member, the first elastic member contacts the retaining ring toward one end of the transmission rod, and the second elastic member contacts the retaining ring toward one end of the transmission rod;

[0017] The transmission rod pushes the retaining ring and the push rod to move and pushes the first elastic member and the second elastic member to contract.

[0018] Optionally, a positioning head is integrally formed on a side of the retaining ring facing the first elastic member, and the positioning head extends into the first elastic member and contacts an inner wall of the first elastic member.

[0019] Optionally, the push rod is provided with an annular slot at the retaining ring, a retaining spring is clamped in the slot, the retaining spring is located on the side of the retaining ring facing the transmission rod, and the retaining spring is in contact with the retaining ring.

[0020] Optionally, a limiting sleeve is integrally formed on a side of the transmission rod facing the push rod, and the limiting sleeve is arranged on the second elastic member.

[0021] The technical solution of the utility model has the following advantages:

[0022] 1. The long-stroke protection micro switch provided by the utility model, when in use, the external mechanical force will push the transmission rod to move in the direction of the push rod, at this time the transmission rod will push the first elastic member and the second elastic member to compress, because the first elastic member is arranged on the push rod, and a contact section is arranged on the side of the push rod facing the micro switch body, and the contact section and the bracket are slidably connected, so that the transmission rod at this time can directly push the push rod to move until the contact section on the push rod contacts the button on the micro switch, and the button is pressed to start the micro switch body. When the external impact force continues to push the transmission rod, the second elastic member and the first elastic member are compressed, and the push rod slides into the inside of the transmission rod. Since the elastic coefficient of the first elastic member is smaller than the elastic coefficient of the second elastic member, the second elastic member disperses the external impact force, and the button position at this time will only bear the elastic force of the first elastic member, thereby reducing the influence of the external impact force on the micro switch body, and the external impact force will not be directly transmitted to the micro switch body, thereby protecting the micro switch and improving the service life of the micro switch.

[0023] 2. The utility model provides a large-stroke protection type micro switch, and the sealing member adopts a bellows, thereby improving the sealing performance, and the bellows can withstand a higher air pressure inside the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the overall structure of the micro switch of the utility model;

[0026] Figure 2 for Figure 1 Enlarged view of part A in .

[0027] Description of reference numerals:

[0028] 1. Shell; 2. Micro switch body; 3. Button; 4. Push rod; 5. Contact section; 6. First elastic member; 7. Second elastic member; 8. Transmission rod; 9. Bracket; 10. Sealing member; 101. Bellows; 11. Push plate; 12. Third elastic member; 13. Retaining ring; 14. Positioning head; 15. Slot; 16. Retaining spring; 17. Limiting sleeve; 18. Placement slot. DETAILED DESCRIPTION

[0029] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Unless otherwise clearly specified and limited, the terms "disposed", "installed", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0032] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0033] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0034] Example

[0035] Reference Figure 1 and Figure 2 As shown, the utility model provides a large-stroke protection type micro switch, including a shell 1, a micro switch body 2, a second elastic member 7, a transmission member and a bracket 9, wherein the shell 1 is vertical and hollow inside, the shell 1 is filled with gas for air-tight sealing, the micro switch body 2 is arranged at the bottom of the shell 1, and a button 3 for controlling the opening and closing of the micro switch is arranged at the bottom of the micro switch body 2. The internal structure of the micro switch body 2 is not explained or limited herein, and the micro switches in the prior art can be used in this embodiment.

[0036] The push rod 4 is vertically arranged, and one end of it is facing the button 3 of the micro switch body 2. A first elastic member 6 is sleeved on the push rod 4. The first elastic member 6 is vertically arranged and coaxial with the push rod 4. A contact section 5 is integrally formed at the bottom of the push rod 4. A step for placing the push rod 4 is formed between the contact section 5 and the push rod 4. The bottom end of the first elastic member 6 is in contact with the contact section 5 toward the push rod 4, and the top end is in contact with the bottom of the transmission rod 8.

[0037] The second elastic member 7 is sleeved on the first elastic member 6. The second elastic member 7 is vertically and coaxially arranged with the first elastic member 6. The elastic coefficient of the first elastic member 6 is smaller than that of the second elastic member 7. In the present embodiment, the first elastic member 6 and the second elastic member 7 are both arranged as compression springs. The top of the second elastic member 7 also contacts the bottom of the transmission rod 8.

[0038] The transmission rod 8 is vertically arranged and coaxial with the push rod 4. The transmission rod 8 is passed through the top of the shell 1, and its bottom end extends into the shell 1, so that the bottom end of the transmission rod 8 conflicts with the top of the first elastic member 6 and the second elastic member 7. The transmission rod 8 is hollow inside and has an opening at the bottom. The push rod 4 can slide into the transmission rod 8 toward one end of the transmission rod 8. The transmission rod 8 is used to push the push rod 4 to move toward the micro switch body 2.

[0039] The bracket 9 is arranged in the shell 1, and the bracket 9 and the shell 1 are integrally formed. The bracket 9 is arranged between the microswitch body 2 and the push rod 4, and the microswitch body 2 and the push rod 4 are placed separately. At the same time, the bottom end of the second elastic member 7 will conflict with the top side of the bracket 9. At this time, when the transmission rod 8 is pushed, the second elastic member 7 can be compressed between the bracket 9 and the transmission rod 8, and the contact segment 5 on the push rod 4 is slidably set on the bracket 9. The transmission rod 8 can push the push rod 4 and the contact segment 5 on the push rod 4 to slide on the bracket 9, thereby moving the contact segment 5 to the button 3 and pressing the button 3.

[0040] When in use, the external mechanical force will push the transmission rod 8 to move in the direction of the push rod 4. At this time, the transmission rod 8 will push the first elastic member 6 and the second elastic member 7 to compress. Since the first elastic member 6 is arranged on the push rod 4, a contact section 5 is arranged on the side of the push rod 4 facing the micro switch body 2. The contact section 5 and the bracket 9 are slidably connected. At this time, the transmission rod 8 can directly push the push rod 4 to move until the contact section 5 on the push rod 4 contacts the button 3 on the micro switch. The micro switch body 2 is started by pressing the button 3. When the external impact force continues to push the transmission rod 8, the second elastic member 7 and the first elastic member 6 are compressed, and the push rod 4 will slide into the transmission rod 8. Since the elastic coefficient of the first elastic member 6 is less than the elastic coefficient of the second elastic member 7, the second elastic member 7 will disperse the external impact force. At this time, the button 3 will only bear the elastic force of the first elastic member 6, thereby reducing the influence of the external impact force on the micro switch body 2. The external impact force will not be directly transmitted to the micro switch body 2, thereby protecting the micro switch and improving the service life of the micro switch.

[0041] As a specific implementation, a placement groove 18 is opened at the top of the shell 1, and a through hole is opened at the bottom of the placement groove 18. At this time, the transmission rod 8 is inserted into the through hole, so that the bottom end of the transmission rod 8 is inserted into the shell 1, and a seal 10 is provided in the placement groove 18, that is, in the gap between the transmission rod 8 and the shell 1, for sealing the transmission rod 8 and the shell 1, so that the gap between the transmission rod 8 and the through hole will not affect the sealing effect inside the shell 1.

[0042] The sealing member 10, in the present embodiment, comprises a bellows 101 sleeved on the surface of the transmission rod 8, the bellows 101 is vertically arranged, the top end of the bellows 101 and the side wall of the transmission rod 8 are sealed and welded, and the bottom end of the bellows 101 and the bottom wall of the groove are sealed and welded, thereby sealing the transmission rod 8 and the through hole. By using the bellows 101 instead of the sealing ring, the sealing is improved, and the bellows 101 can withstand a higher air pressure inside the housing 1.

[0043] As a specific implementation, a limiting sleeve 17 is integrally formed at one end of the transmission rod 8 facing the push rod 4. The limiting sleeve 17 is vertically arranged and has an opening at the bottom. The limiting sleeve 17 is sleeved on the second elastic member 7 and the inner wall of the limiting sleeve 17 is in contact with the outer wall of the second elastic member 7, thereby limiting the top of the second elastic member 7 within the limiting sleeve 17.

[0044] As another embodiment, a retaining ring 13 is provided on the push rod 4. The retaining ring 13 is located inside the limiting sleeve 17 and is arranged on the top of the limiting sleeve 17. The retaining ring 13 is located between the transmission rod 8 and the first elastic member 6. The bottom side of the retaining ring 13 is in contact with a section of the first elastic member 6 toward the transmission rod 8, and is also in contact with an end of the second elastic member 7 toward the transmission rod 8. The transmission rod 8 is in contact with the top of the first elastic member 6 and the second elastic member 7 through the retaining ring 13. When the transmission rod 8 is pushed, the transmission rod 8 can drive the retaining ring 13 to move, so that the retaining ring 13 can push the first elastic member 6 and the second elastic member 7 to compress, thereby pushing the push rod 4 to move.

[0045] A positioning head 14 is integrally formed on the side of the retaining ring 13 facing the first elastic member 6. The positioning head 14 extends into the first elastic member 6 and contacts the inner wall of the first elastic member 6. The positioning head 14 can limit the left and right movement of the first elastic member 6, and the installation of the first elastic member 6 and the second elastic member 7 is more convenient and quick.

[0046] An annular groove 15 is provided on the push rod 4 at the retaining ring 13, and a retaining spring 16 is clamped in the groove 15. The retaining spring 16 is located on the side of the retaining ring 13 facing the transmission rod 8. The retaining spring 16 and the retaining ring 13 are in conflict with each other. At this time, the retaining spring 16 can prevent the push rod 4 from sliding down from the retaining ring 13, and the push rod 4 can only move downward with the retaining ring 13 or move into the transmission rod 8.

[0047] As another embodiment, a push plate 11 is provided at the micro switch body 2, and a third elastic member 12 is provided at the bottom of the push plate 11. The push plate 11 is connected to the outer wall of the micro switch body 2 through the third elastic member 12. When the contact section 5 moves to the push plate 11, the contact section 5 pushes the push plate 11 to move toward the button 3 until the push plate 11 presses the button 3. The contact section 5 contacts the button 3 through the push plate 11. For the push plate 11, both sides of the connection with the third elastic member 12 are inclined upward. The third elastic member 12 is also set as a spring in this embodiment.

[0048] The above is only a specific implementation 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.

Claims

1. A long-stroke protection type micro switch, characterized in that: include: The shell body is hollow inside; A micro switch body is arranged inside the housing, and a button for controlling the opening and closing of the micro switch is arranged on the micro switch; A push rod, one end of which is directly facing the button of the micro switch body, a first elastic member is sleeved on the push rod, the first elastic member and the push rod are coaxial, a contact section is arranged on the side of the push rod facing the micro switch body, and one end of the first elastic member is in contact with the contact section; a second elastic member, sleeved on the first elastic member, the first elastic member and the second elastic member are coaxially arranged, and the elastic coefficient of the first elastic member is smaller than the elastic coefficient of the second elastic member; A transmission rod is coaxial with the push rod and one end of the transmission rod is inserted into the housing, one end of the transmission rod facing the push rod contacts one end of the first elastic member facing away from the contact section, one end of the transmission rod facing the push rod contacts one end of the second elastic member, one end of the push rod facing the transmission rod can slide into the interior of the transmission rod, and the transmission rod is used to push the push rod to move toward the micro switch body; The bracket is arranged between the micro switch body and the push rod, the second elastic member is in contact with the bracket at one end facing away from the transmission rod, and the contact section is slidably arranged on the bracket.

2. The long-stroke protection type micro switch according to claim 1, characterized in that: A sealing member is provided at the gap between the transmission rod and the housing, for sealing between the transmission rod and the housing.

3. The long-stroke protection type micro switch according to claim 2, characterized in that: The sealing element comprises a bellows sleeved on the surface of the transmission rod, one end of the bellows is sealingly connected to the side wall of the transmission rod, and the other end is sealingly connected to the inner wall of the housing located at the transmission rod.

4. The long-stroke protection type micro switch according to claim 1, characterized in that: A push plate is provided at the micro switch body, and the push plate is connected to the outer wall of the micro switch body through a third elastic member. When the contact section moves to the push plate, the contact section pushes the push plate to move toward the button until the push plate presses the button.

5. The long-stroke protection type micro switch according to claim 1, characterized in that: A retaining ring is sleeved on the push rod, and the retaining ring is located between the transmission rod and the first elastic member, the first elastic member contacts the retaining ring toward one end of the transmission rod, and the second elastic member contacts the retaining ring toward one end of the transmission rod; The transmission rod pushes the retaining ring and the push rod to move and pushes the first elastic member and the second elastic member to contract.

6. The long-stroke protection type micro switch according to claim 5, characterized in that: A positioning head is integrally formed on one side of the retaining ring facing the first elastic member. The positioning head extends into the first elastic member and contacts the inner wall of the first elastic member.

7. The long-stroke protection type micro switch according to claim 5, characterized in that: The push rod is provided with an annular clamping groove at the retaining ring, a clamping spring is clamped in the clamping groove, and the clamping spring is located on the side of the retaining ring facing the transmission rod, and the clamping spring and the retaining ring are in conflict.

8. The long-stroke protection type micro switch according to any one of claims 1 to 7, characterized in that: A limiting sleeve is integrally formed on the side of the transmission rod facing the push rod, and the limiting sleeve is arranged on the second elastic member.

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