Browse Prior Art Database

Failsafe Interlock Latch

IP.com Disclosure Number: IPCOM000089663D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Hanson, CA: AUTHOR

Abstract

This latch combines the functions of a standard fastener and a prong-type breaker switch.

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Failsafe Interlock Latch

This latch combines the functions of a standard fastener and a prong-type breaker switch.

Metallic prong catch 1 is rotatably mounted to, but insulated from, safety cover 2 by rotary button 3. Latch plate 4, containing insulated contact springs 5 and 6, and latch housing 7 are mounted inside housing 8 of the device to be protected. As safety cover 2 is closed, catch 1 is rotated 90 Degrees, thus securing cover 2 and completing electrical circuit via contact springs 5 and 6 to which cables 9 are attached. Contact springs 5 and 6 are located such that, when turning button 3 to open safety cover 2, the electrical circuit is broken first. Further rotation of button 3 finally disengages catch 1 mechanically from the latch plate 4, allowing the opening of safety cover 2. Since catch 1 is part of the electrical circuit, its displacement assures complete removal of any safety hazard.

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