# US 5,704,812 A · Car plug

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

- Number: US 5,704,812 A
- Document ID: US5704812A
- Status: Granted
- Kind: A
- Application number: 08/712,465
- Filed: 1996-09-11
- Granted: 1998-01-06
- Earliest claimed: 1995-09-11
- Inventors: Eiro Moji
- Web page: https://patentgrep.com/patent/US5704812A

## CPC

- H01R 24/58: Contacts spaced along longitudinal axis of engagement
- H01H 85/54: Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
- H01R 2103/00: Two poles
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- 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)

## Abstract

A car plug used to derive power comprises notches provided at alternate positions among positions obtained by circumferentially dividing a peripheral wall of a body into quarters, terminals of an elastic terminal board incorporated in the body and externally exposed through the notches, notched window-holes formed at alternate remaining positions among the positions obtained by the division into quarters, arm portions having one end connected with the peripheral wall of the body, and the other end for supporting pressure-contact members disposed in the notched window-holes so as to move in a radial direction of the body by the arm portions, the body incorporating a switching cam having cam portions switched over between positions in pressure contact with inner surfaces of arm portions of the elastic terminal board and positions to release the pressure contact, and having cam portions switched over between positions to push out the pressure-contact members to the outer surface side of the body and positions to release the pushing, and operation members for switch-over operation of the switching cam and externally exposed through operation openings in the peripheral wall of the body.

## Claims

### Claim 1

A car plug used to derive power by removably inserting a body having a cylindrical form into a bayonet socket for a cigar lighter, mounted in a cabin of an automobile, the car plug comprising:
notches provided in the body at alternate positions among four positions obtained by circumferentially dividing a peripheral wall of the body into quarters;
terminals of an elastic terminal board incorporated in the body and externally exposed through the notches;
notched window-holes formed at alternate remaining positions among the four positions obtained by the division into quarters;
arm portions having one end connected with the peripheral wall of the body, and the other end for supporting pressure-contact members which are disposed in the notched window-holes so as to move in a radial direction of the body by the arm portions;
the body incorporating a switching cam having cam portions switched over between positions in pressure contact with inner surfaces of arm portions of the elastic terminal board and positions to release the pressure contact, and cam portions switched over between positions to push out the pressure-contact members to the outer surface side of the body and positions to release the pushing; and
operation members for switch-over operation of the switching cam and externally exposed through operation openings in the peripheral wall of the body.

### Claim 2 (depends on 1)

A car plug according to claim 1, wherein the operation openings through which the operation members of the switching cam can be operated are formed behind the notched window-holes and are communicated with the notched window-holes in which the pressure-contact members are disposed.

### Claim 3 (depends on 1)

A car plug according to claim 1, wherein the switching cam is provided in a ring form, and is rotatably supported on an outer periphery of a fuse case incorporated as an inner cylinder in the body, the cam portions being disposed in a first half of the switching cam to be switched over between a state to push out the pressure-contact members and a state to release the pushing, and the cam portions being disposed in the latter half to be switched over between a state in pressure contact with the inner surfaces of the arm portions of the elastic terminal board and a state to release the pressure contact.

### Claim 4 (depends on 2)

A car plug according to claim 2, wherein the operation members are mounted on the switching cam at intermediate positions between the cam portions in the first half and the cam portions in the latter half.