# US 4,400,678 A · Fuse switch box

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- Number: US 4,400,678 A
- Document ID: US4400678A
- Status: Granted
- Kind: A
- Application number: 06/258,812
- Filed: 1981-04-29
- Granted: 1983-08-23
- Earliest claimed: 1981-04-29
- Inventors: Chang C. Chen; Chei P. Chan
- Web page: https://patentgrep.com/patent/US4400678A

## CPC

- H01H 85/545: {with pivoting fuse carrier (tumbler switch with built-in fuse H01H23/10)}
- H01H 9/102: {Fuses mounted on or constituting the movable contact parts of the switch}
- 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 safe and simple fuse replacement device whereby facile exchange of fuse can be achieved by means of the introduction of the replacement fuse onto a tripper that will jump outwards as it is subjected to elastic pressure transferred by a spring mechanism.

## Claims

### Claim 1

A fuse switch box with means to replace a fuse contained in a fuse tube comprising
a mounting unit,
a tripper in the form of a door pivotally mounted on said mounting unit and including on its interior
a pair of grooved pieces to accommodate cross-over linkage of a fuse tube,
a jutting foot extending from each of said grooved pieces,
sockets connected respectively to power input and power output leads and located to receive and couple to each of said jutting feet forming a closed electrical circuit when said tripper is in a closed position parallel to said mounting unit,
compression spring mechanism biased against said tripper to bias it in an open position to detach said jutting feet from said sockets and thereby open the electrical circuit of the fuse,
latching means to hold said tripper in the closed position against the bias of said compression spring mechanism
whereby upon release of said latching means said tripper springs to an open position and quickly disconnects the electrical circuit including separating said jutting feet from said sockets.

### Claim 2 (depends on 1)

The device as stated in claim 1, further characterized in that said spring mechanism thereof includes two sets of three-section ferrule tubing joints provided respectively at both sides inside said tripper, a compressive spring provided in each said ferrule joint whereby said three-section ferrule tubing joints can be extended at will subject to thrust from said springs so as to force said tripper to jump outward to the outside of said mounting slab.

### Claim 3 (depends on 5)

The device as stated in claim 5, further characterized in the provision of mobile tongue that is supplemented with a spanner near the mobile end of said tripper on said mounting slab for said latching means as part thereof, said tongue let-in coupled into a hole at the mobile end of said tripper by a spring means locking said tripper onto said mounting unit.

### Claim 4 (depends on 3)

The device as stated in claim 3, further characterized in that the mobile end of said tripper is slightly duly sloped.