Browse Prior Art Database

Safety Cover

IP.com Disclosure Number: IPCOM000078221D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Owen, MP: AUTHOR

Abstract

In many laboratories electrical connections are taken from bus boxes 1 (3-phase powered) which extend around the laboratory and have easily removable covers thereon, so as to facilitate quick attachment to and power takeoff from the fingers 3A - 3C projecting from the bus. Conventionally, a circuit breaker and the like is connected to one of the projecting fingers and wires lead from there to the machinery which is to be supplied with the electrical power. Remaining in the box are then two electrically hot projecting fingers, which creates a hazard to the user and to the person connecting the circuit breaker to the bus. To provide safe access to the box while the bus is powered, it is desirable to cover the projecting fingers which are not being addressed by the electrician.

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Safety Cover

In many laboratories electrical connections are taken from bus boxes 1 (3- phase powered) which extend around the laboratory and have easily removable covers thereon, so as to facilitate quick attachment to and power takeoff from the fingers 3A - 3C projecting from the bus. Conventionally, a circuit breaker and the like is connected to one of the projecting fingers and wires lead from there to the machinery which is to be supplied with the electrical power. Remaining in the box are then two electrically hot projecting fingers, which creates a hazard to the user and to the person connecting the circuit breaker to the bus. To provide safe access to the box while the bus is powered, it is desirable to cover the projecting fingers which are not being addressed by the electrician.

Referring to the drawing, a safety device comprising an insulating block of material 10 which is frangible to form separate parts 10A, 10B, 10C, each having a handle portion 11A - 11C, includes a plurality of recesses 12, 13 and 14 on the lower surface thereof. The recesses 12-14 are dimensioned to accommodate a projecting finger on the bus, each recess containing a projection 15 which is utilized to grasp and hold the safety device to the exposed fingers on the bus.

In most instances a single and sometimes a double-circuit breaker may be attached to the projecting fingers on the bus. However, it still is desirable to protect the electrician installer from accidentally contactin...