A normally closed automatic reset micro switch

Abstract

The present invention discloses a normally closed automatic reset micro switch, which relates to the field of micro switches. In view of the problem that existing micro switches are difficult to assemble and have low production efficiency due to their complex structure, the following solution is proposed, which includes a plastic shell and a base, the plastic shell is sleeved on the top of the base, and a control mechanism is provided between the plastic shell and the base. The control mechanism is a spring-controlled single-bridge normally closed structure, the control mechanism includes a first terminal, a second terminal and a contact piece, the top of the first terminal is semi-annularly bent and provided with a first bend, the top of the second terminal is right-angled and provided with a second bend, one end of the contact piece is semi-annularly bent and provided with a third bend, and the third bend is sleeved with the first bend. The present invention has a novel structure and effectively solves the problem that existing micro switches are difficult to assemble and have low production efficiency due to their complex structure.

Description

Technical Field

[0001] The present invention relates to the field of micro switches, and in particular to a normally closed automatic reset micro switch. Background Art

[0002] Micro switches are small in size and are very suitable for use in micro electrical equipment. Most micro switches have very delicate structures, and the production process steps of their components are many and complex, so they can only be semi-automated. Many parts with complex shapes have to be assembled manually, making it difficult to improve production efficiency and yield. Therefore, in order to simplify the micro switch structure, reduce the difficulty of micro switch assembly and improve production efficiency, we proposed a normally closed automatic reset micro switch. Summary of the Invention

[0003] The invention provides a normally closed automatic reset micro switch, which solves the problem of difficult assembly and low production efficiency of existing micro switches due to their complex structure.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A normally closed automatic reset micro switch comprises a plastic shell and a base. The plastic shell is sleeved on the top of the base, and a control mechanism is provided between the plastic shell and the base. The control mechanism is a spring-controlled single-bridge normally closed structure.

[0006] Preferably, the control mechanism includes a first terminal, a second terminal, and a contact piece, wherein the top end of the first terminal is bent in a semi-circular shape and provided with a first bend, the top end of the second terminal is bent in a right-angle shape and provided with a second bend, one end of the contact piece is bent in a semi-circular shape and provided with a third bend, and the third bend is sleeved with the first bend, and the end of the contact piece away from the first terminal is overlapped with the bottom of the second bend;

[0007] Preferably, a third spring is provided downwardly at one end of the contact piece located at the third bend, a circular hole is provided in the middle of the contact piece, and a second spring is provided at the bottom end of the contact piece located at the circular hole.

[0008] Preferably, a first contact is provided at one end of the contact piece close to the second terminal, and a second contact is provided at the second bend located at the first contact.

[0009] Preferably, the first terminal and the second terminal are both arranged vertically downward.

[0010] Preferably, a groove is provided at the top of the plastic shell, and a button is sleeved on the groove, and slots are provided on both sides of the plastic shell.

[0011] Preferably, external cards are provided on both sides of the base, and the external cards are matched with the card slots, and the top of the base is provided with a first circular groove, a second circular groove, a first slot and a second slot, and the first slot and the second slot are distributed at both ends of the base.

[0012] Preferably, the first terminal is plugged into the first slot, the second terminal is plugged into the second slot, the bottom end of the second spring is socketed into the first circular groove, and the bottom end of the third spring is socketed into the second circular groove, a cylinder is provided in the second circular groove, and the cylinder is plugged into the bottom end of the third spring.

[0013] Preferably, a first spring is provided at the bottom end of the button, the first spring passes through the circular hole, and the first spring is sleeved with the second spring.

[0014] The beneficial effects of the present invention are:

[0015] 1. The contact piece of the device is connected to the first terminal in a semi-ring manner and is compressed by a third spring. While meeting the requirements of small deflection of the contact piece and contact reliability, it also reduces the assembly difficulty compared to the ordinary hinged structure with a shaft.

[0016] 2. The device deflects the contact piece and disconnects the connection by pressing the button, and at the same time, compresses the first spring and the second spring, so that after releasing the button, the button is reset by the first spring, and the contact piece is reset by the second spring. The first spring and the second spring of the device are sleeved, and the button and the first spring and the second spring are also on the same axis, so that the device can achieve the normally closed automatic reset function while maintaining a simple and compact structure. The simple reset structure helps to reduce the difficulty of assembly.

[0017] In summary, the device effectively solves the problems of the existing micro switch, such as difficult assembly and low production efficiency due to its complex structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the plastic shell of the present invention after it is opened.

[0020] Figure 3 It is an exploded view of the assembly structure of the present invention.

[0021] Figure 4 It is a schematic diagram of the internal structure of the closed state of the present invention.

[0022] Figure 5 Schematic diagram of the internal structure of the present invention in the disconnected state.

[0023] Numbers in the figure: 1, plastic shell; 101, groove; 102, button; 103, card slot; 2, base; 201, outer card; 202, first circular groove; 203, second circular groove; 204, cylinder; 205, first slot; 206, second slot; 3, control mechanism; 301, first terminal; 302, first bend; 303, second terminal; 304, second bend; 305, second contact; 306, contact piece; 307, circular hole; 308, first contact; 309, third bend; 310, first spring; 311, second spring; 312, third spring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figure 1-Figure 5 A normally closed automatic reset micro switch includes a plastic shell 1 and a base 2. The plastic shell 1 is sleeved on the top of the base 2, and a control mechanism 3 is provided between the plastic shell 1 and the base 2. The control mechanism 3 is a spring-controlled single-bridge normally closed structure. The control mechanism 3 includes a first terminal 301, a second terminal 303 and a contact piece 306. The top of the first terminal 301 is semi-circular and has a first bend 302. The top of the second terminal 303 is right-angled and has a second bend 304. One end of the contact piece 306 is semi-circular and has a third bend 309. The third bend 309 is aligned with the first bend. Bend 302 is sleeved, and the end of the contact piece 306 away from the first terminal 301 overlaps the bottom of the second bend 304. The end of the contact piece 306 close to the second terminal 303 is provided with a first contact 308, and the second bend 304 is provided with a second contact 305 at the first contact 308. The first terminal 301 and the second terminal 303 are both arranged vertically downward. The end of the contact piece 306 located at the third bend 309 is provided with a third spring 312 downward. A circular hole 307 is opened in the middle of the contact piece 306, and a second spring 311 is provided at the bottom end of the contact piece 306 located at the circular hole 307;

[0026] The contact piece 306 and the first terminal 301 of the device are connected (overlapped) by the first bend 302 and the third bend 309. Since the first bend 302 and the third bend 309 both have a semi-annular structure, the third bend 309 and the first bend 302 are pressed from bottom to top by the third spring 312, so that the entire contact piece 306 can be slightly deflected with the arc-shaped contact point between the first bend 302 and the third bend 309 as the axis.

[0027] The top of the plastic shell 1 is provided with a groove 101, and the groove 101 is sleeved with a button 102. Both sides of the plastic shell 1 are provided with a card slot 103. Both sides of the base 2 are provided with an external card 201, and the external card 201 is matched with the card slot 103. The top of the base 2 is provided with a first circular groove 202, a second circular groove 203, a first slot 205 and a second slot 206. The first slot 205 and the second slot 206 are distributed at both ends of the base 2. The first terminal 301 is connected to the first plug. The second terminal 303 is plugged into the second slot 206, the bottom end of the second spring 311 is sleeved with the first circular groove 202, and the bottom end of the third spring 312 is sleeved with the second circular groove 203. A cylinder 204 is provided in the second circular groove 203, and the cylinder 204 is plugged into the bottom end of the third spring 312. A first spring 310 is provided at the bottom end of the button 102, the first spring 310 passes through the circular hole 307, and the first spring 310 is sleeved with the second spring 311.

[0028] At this time Figure 5 As shown, the device presses the button 102 downward, causing the button 102 to compress the first spring 310 downward. Continuing to press the button 102, the button 102 contacts and presses down the contact piece 306, while compressing the second spring 311. At this time, the contact piece 306 is separated from the second terminal 303 (if connected to a short circuit, the circuit will be disconnected). After releasing the button 102, the first spring 310 resets the button 102, and the second spring 311 resets the contact piece 306, so that the contact piece 306 and the second terminal 303 are re-closed. Figure 4 shown.

[0029] Working principle: The contact piece 306 of the device is connected (overlapped) to the first terminal 301 through the first bend 302 and the third bend 309. Since the first bend 302 and the third bend 309 both have a semi-annular structure, the third bend 309 is pressed from bottom to top by the third spring 312, so that the entire contact piece 306 can be slightly deflected with the arc-shaped contact point of the first bend 302 and the third bend 309 as the axis, and then the second spring 311 pushes upward from the middle of the contact piece 306, so that the other end of the contact piece 306 presses the second terminal 301 upward. The second bend 304 at the top of 03 realizes the normally closed structure between the first terminal 301 and the second terminal 303. The device presses the button 102 downward, causing the button 102 to compress the first spring 310 downward. Continuing to press the button 102, the button 102 contacts and presses down the contact piece 306, while compressing the second spring 311. At this time, the contact piece 306 is separated from the second terminal 303. After releasing the button 102, the first spring 310 resets the button 102, and the second spring 311 resets the contact piece 306, so that the contact piece 306 and the second terminal 303 are closed again.

[0030] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A normally closed automatic reset micro switch, comprising a plastic shell (1) and a base (2), characterized in that The plastic shell (1) is sleeved on the top of the base (2), and a control mechanism (3) is provided between the plastic shell (1) and the base (2), and the control mechanism (3) is a spring-controlled single-bridge normally closed structure; The control mechanism (3) comprises a first terminal (301), a second terminal (303) and a contact piece (306); the top of the first terminal (301) is bent in a semi-circular shape and is provided with a first bend (302); the top of the second terminal (303) is bent in a right-angle shape and is provided with a second bend (304); one end of the contact piece (306) is bent in a semi-circular shape and is provided with a third bend (309); the third bend (309) is sleeved with the first bend (302); and the end of the contact piece (306) away from the first terminal (301) is overlapped with the bottom of the second bend (304); A third spring (312) is provided downwardly at one end of the contact piece (306) located at the third bend (309), a circular hole (307) is provided in the middle of the contact piece (306), and a second spring (311) is provided at the bottom end of the contact piece (306) located at the circular hole (307); The first terminal (301) is plugged into the first slot (205), the second terminal (303) is plugged into the second slot (206), the bottom end of the second spring (311) is sleeved into the first circular groove (202), and the bottom end of the third spring (312) is sleeved into the second circular groove (203), a cylinder (204) is provided in the second circular groove (203), and the cylinder (204) is plugged into the bottom end of the third spring (312).

2. A normally closed automatic reset micro switch according to claim 1, characterized in that: A first contact point (308) is provided at one end of the contact piece (306) close to the second terminal (303), and a second contact point (305) is provided at the second bend (304) located at the first contact point (308).

3. A normally closed automatic reset micro switch according to claim 1, characterized in that: The first terminal (301) and the second terminal (303) are both arranged vertically downward.

4. A normally closed automatic reset micro switch according to claim 1, characterized in that: A groove (101) is provided at the top of the plastic shell (1), and a button (102) is sleeved on the groove (101). Card slots (103) are provided on both sides of the plastic shell (1).

5. The normally closed automatic reset micro switch according to claim 1, characterized in that: External cards (201) are provided on both sides of the base (2), and the external cards (201) are matched and snap-connected with the card slots (103). A first circular groove (202), a second circular groove (203), a first slot (205) and a second slot (206) are provided on the top of the base (2), and the first slot (205) and the second slot (206) are distributed at both ends of the base (2).

6. A normally closed automatic reset micro switch according to claim 4, characterized in that: A first spring (310) is provided at the bottom end of the button (102), the first spring (310) passes through the circular hole (307), and the first spring (310) is sleeved with the second spring (311).

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