Safety interlock

Details Safety interlock Safety interlock

1987-11-24

1989-04-11

Dorner, Kenneth J.

Supports: cabinet structure

Gang-bar type locking or latching means

Concealed

312220, 384 23, E05C 706

Patent

active

048200026

ABSTRACT:
A filing cabinet includes a safety interlock that prevents more than one drawer from being opened at a time. The safety interlock comprises a column of endwise abutting catches mounted to the cabinet wall for vertical reciprocation thereon. The ends of the catches are formed with tabs. The tabs of adjacent catches cooperate to define gaps of predetermined spacing. Actuator means on each cabinet drawer are aligned with the catch gaps. When a selected drawer is opened, the actuator means thereon enters the associated gap and displaces upwardly any higher catches. Upward displacement causes the gaps between higher adjacent catches to be displaced into the paths of the actuator means of any higher drawers, thereby preventing any higher drawers from being opened. The retainer of an open drawer blocks upward displacement of any lower catches, thereby preventing lower drawers from being opened. A slide is reciprocably mounted on each retainer. The slide remains in the gap to maintain catch upward displacement when the drawer is opened such that the retainer passes completely through the gap. The catches are severable approximately in line with the top of each drawer to enable easy field conversion of cabinet drawers without affecting interlock components associated with non-converted drawers.

REFERENCES:
patent: 113871 (1871-01-01), Gibbons
patent: 3404929 (1968-10-01), Wright et al.
patent: 3883200 (1975-05-01), Latham
patent: 3888558 (1975-06-01), Himsl
patent: 3927918 (1975-12-01), Dobbratz
patent: 4240685 (1980-12-01), Terlecki
patent: 4272138 (1981-06-01), Stark
patent: 4441767 (1984-04-01), Stark
patent: 4447098 (1984-05-01), Parker
patent: 4480883 (1984-11-01), Young
patent: 4637667 (1987-01-01), Reid et al.

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