# US 11,114,260 B2 · Scissor-leg structural key and its switch device, and a keyboard applying the key

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,114,260 B2
- Document ID: US11114260B2
- Status: Granted
- Kind: B2
- Application number: 16/076,334
- Filed: 2017-09-01
- Published: 2021-06-17
- Granted: 2021-09-07
- Earliest claimed: 2017-04-07
- Applicants: Dongguan Mingjian Electronic Technology Co., Ltd
- Inventors: Jianping Li
- Web page: https://patentgrep.com/patent/US11114260B2

## CPC

- H01H 3/125: {using a scissor mechanism as stabiliser}
- H01H 13/7065: characterised by the mechanism between keys and layered keyboards
- H01H 13/83: characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
- H01H 13/85: characterised by tactile feedback features
- H03K 17/965: Switches controlled by moving an element forming part of the switch
- H03K 17/969: having a plurality of control members, e.g. keyboard
- H03K 17/972: having a plurality of control members, e.g. keyboard
- H03K 17/98: having a plurality of control members, e.g. keyboard
- H01H 2215/03: Sound
- H01H 2231/002: Calculator, computer
- H01H 2235/01: Spiral spring
- H03K 2217/9651: the moving element acting on a force, e.g. pressure sensitive element
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)

## Abstract

A switch device, having a reset assistant part arranged at the second end of a male leg, and a ram; the reset assistant part being provided with a holding station, both sidewalls of which are each provided with a saddle, both sides of the ram being provided, with a cam matching with the saddle, the ram is hung from the saddle through two cams. Accordingly, a photoelectrical type switch of scissor-leg structure is realized, and the key is enabled to have an obvious stage sense and sound.

## Claims

### Claim 1

A switch device comprising resettable scissor-legs which include a male leg and a female leg, forming a scissor structure, and a mounting receptacle, a first end of the male leg hinged to the mounting receptacle, and a first end of the female leg slidably arranged in the mounting receptacle a reset assistant part arranged a second end of the male leg, the reset assistant part provided with a holding station, both sidewalls of which are each provided with a saddle: a ram, both sides of which are provided with a cam matching with the saddle, the ram hanged from the saddles through the two cams; the mounting receptacle provided with a recess portion for receiving the ram; the ram arranged on the sidewalls of the recess portion when the scissor-leg structure is in an original position, and moved in a direction capable of dropping into the recess portion when the scissor-leg structure is depressed, and dropped in the recess portion after the scissor-legs are depressed into a stagnation point, and the saddle resetting the ram during the scissor-leg structure reset.

### Claim 2 (depends on 1)

The switch device according to the claim 1, further comprises a push part for pushing the ram, the push part arranged at the first end of the female leg, the push part pushing the ram to move when the scissor-legs are furled.

### Claim 3 (depends on 1)

The switch device according to the claim 1, characterized in that, the saddles are on a dropping locus of the cam after the scissor-legs are depressed into the stagnation point.

### Claim 4 (depends on 1)

The switch device according to the claim 1, characterized in that, the saddle comprises a concave curved surface having a rising trend from one end of the concave curved surface to a connection portion, and a platform surface connected with the concave curved surface, a bottom of the cam being a surface with a top recess portion.

### Claim 5 (depends on 1)

The switch device according to the claim 1, characterized in that, the sidewalls of the recess portion forming into a first stop, an outside of the ram is provided with a second stop matching with the first stop, and the first stop interlocked with the second stop when the ram is dropped in the recess portion.

### Claim 6 (depends on 5)

The switch device according to the claim 5, characterized in that, the sidewalls form into three stop grooves as the first stops, which are distributed as a triangle, and three stop blocks are formed on the outside of the ram as the second stops and distributed as a triangle.

### Claim 7 (depends on 5)

The switch device according to the claim 5, characterized in that, the holding station is a stop frame which is nested on the outside of the ram.

### Claim 8 (depends on 1)

A scissor-leg structural key comprising a switch device according to claim 1, and a key cap is arranged on the scissor-legs.

### Claim 9 (depends on 8)

The scissor-leg structural key according to the claim 8, further comprises a return spring arranged between the key cap and the ram; one end of the return spring is arranged at the key cap, and another end of the return spring is arranged at the ram.

### Claim 10 (depends on 8)

The scissor-leg structural key according to the claim 8, further comprises a pedestal for mounting the scissor-leg structural key on a circuit board, and the mounting receptacle is arranged on the pedestal.

### Claim 11 (depends on 8)

The scissor-leg structural key according to the claim 8, characterized in that, a LED lamp is arranged on the mounting receptacle near a middle of the scissor-leg.

### Claim 12

The scissor-leg structural key according to the claim characterized in that, a primary spring is arranged at a middle of the scissor-leg for actuating the scissor-leg to reset; one end of the primary spring is arranged at the mounting receptacle; the key cap depresses the primary spring and the scissor-leg when the key cap is depressed, and the primary returns after external force is removed, and actuates the key cap and the scissor-leg to reset.

### Claim 13 (depends on 1)

A scissor-leg structural key comprises a switch device according to claim 1; a key cap is arranged above the scissor-leg; optical element holding stations are arranged respectively on both of the opposite sides of the recess portion a light receiver element and a light transmitter element are respectively arranged at the two optical element holding stations.

### Claim 14 (depends on 13)

The scissor-leg structural key according to the claim 13, characterized in that, the optical element holding station is connected with the recess portion by arranging a transmission hole.

### Claim 15 (depends on 13)

The scissor-leg structural key according to the claim 13, further comprises a return spring arranged between the key cap and the ram; one end of the return spring is arranged at the key cap, and another end of the return spring is arranged at the ram.

### Claim 16 (depends on 15)

The scissor-leg structural key according to the claim 15, characterized in that, a top of the ram is provided with a recess for stopping the return spring, the end portion of the return spring arranged in the recess.

### Claim 17 (depends on 13)

The scissor-leg structural key according to the claim 13, further comprises a pedestal for mounting the scissor-leg structural key on a circuit board, and the mounting receptacle is removably mounted on the pedestal.

### Claim 18 (depends on 13)

The scissor-leg structural key according to the claim 13, further comprises a pedestal for mounting the scissor-leg structural key on a circuit board, and the mounting receptacle is secured on the pedestal, the mounting receptacle and the pedestal being an unbreakable unity.

### Claim 19 (depends on 13)

The scissor-leg structural key according to the claim 13, characterized in that, a dirt-proof cover is provided between the male and female legs and the key cap; the dirt-proof cover closes on the male and female legs, and the opening edge is embedded in the mounting receptacle; a second end of the female leg is hinged to the dirt-proof cover, and the second end of the male leg, is slidably arranged in the dirt-proof cover.

### Claim 20 (depends on 13)

The scissor-leg structural key according to the claim 13, characterized in that, a LED lamp is arranged on the mounting receptacle near one side of the scissor-leg.

### Claim 21 (depends on 20)

The scissor-leg structural key according to the claim 20, characterized in that, the LED lamp is at a middle of the scissor-leg.

### Claim 22 (depends on 1)

The scissor-leg structural key according to the claim 1, characterized in that, a primary spring is arranged at a middle of the scissor-leg for actuating the scissor-leg to reset; one end of the primary spring is arranged at the mounting receptacle; the key cap depresses the primary spring and the scissor-leg when the key cap is depressed, and the primary returns after external force is removed, and actuates the key cap and the scissor-leg to reset.

### Claim 23 (depends on 8)

A scissor-leg structural keyboard comprises a scissor-leg structural key according to claim 8, and a chassis having a circuit board, the scissor-leg structural key arranged on the chassis.

### Claim 24 (depends on 23)

The scissor-leg structural keyboard according the claim 23, characterized in that, a layer of protection film is provided on the circuit board.

### Claim 25 (depends on 13)

A scissor-leg structural keyboard comprises a scissor-leg structural key according to claim 13, and a chassis having a circuit board, the scissor-leg structural key arranged on the chassis.

### Claim 26 (depends on 25)

The scissor-leg structural keyboard according to the claim 25, characterized in that, the chassis comprises a flexible circuit board, a protection plate and a mounting panel arranged from bottom to top; a pedestal is arranged on the mounting panel; the light receiver element and the light transmitter element are connected with the flexible circuit board.

### Claim 27 (depends on 26)

The scissor-leg structural keyboard according to the claim 26, characterized in that, the optical element holding station is a hollow structure, the pedestal is provided with a hollow structure corresponding to the light transmitter element and light receiver element, the light transmitter element and light receiver element are arranged on the mounting panel, and first through-holes are provided on the protection plate respectively corresponding to the light transmitter element and light receiver element.

### Claim 28 (depends on 27)

The scissor-leg structural keyboard according to the claim 27, characterized in that, the recess portion is a structure penetrating through the mounting receptacle, and second through-holes corresponding to the recess portion are respectively provided on the mounting panel and the protection plate.