Browse Prior Art Database

Fail Safe Switch Actuator

IP.com Disclosure Number: IPCOM000090551D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Beistle, RG: AUTHOR

Abstract

This fail-safe switch actuator provides an off position on either side of a center on position. The device is useful as a safety switch for attachment to a band-type safety bail associated with a power window such as is shown in "Band Type Safety Bail," at pages 688-689 of the IBM Technical Disclosure Bulletin Vol. 11. Actuator arm 2, formed as a motion amplifying bellcrank, has cam surface 3 formed at one end and is rotatable around pivot point 4. Normally, arm 2 is held in a centered position with respect to switch 5 by equalized tension between bail cable 6 and bias spring 7. Cable 6 compares directly with cable 12, described in the mentioned article. In the normal position, lobe 8 on surface 3 holds the roller of switch 5 down. This renders 5 in an on position, allowing normal operation of the power closure device.

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Fail Safe Switch Actuator

This fail-safe switch actuator provides an off position on either side of a center on position. The device is useful as a safety switch for attachment to a band-type safety bail associated with a power window such as is shown in "Band Type Safety Bail," at pages 688-689 of the IBM Technical Disclosure Bulletin Vol.
11. Actuator arm 2, formed as a motion amplifying bellcrank, has cam surface 3 formed at one end and is rotatable around pivot point 4. Normally, arm 2 is held in a centered position with respect to switch 5 by equalized tension between bail cable 6 and bias spring 7. Cable 6 compares directly with cable 12, described in the mentioned article. In the normal position, lobe 8 on surface 3 holds the roller of switch 5 down. This renders 5 in an on position, allowing normal operation of the power closure device. If cable 6 is pulled, tension of spring 7 is overcome and arm 2 pivots in a clockwise motion as shown in dashed lines. The roller of 5 moves upward, turning 5 off. Conversely, if cable 6 slips or breaks, tension of 7 rotates arm 2 counterclockwise, again turning 5 off.

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