Security-transfer systems

Details Security-transfer systems Security-transfer systems

1994-02-22

1995-11-28

Kannan, Philip C.

Movable or removable closures

Sequential closures for passageway

292 45, E06B 700

Patent

active

054696577

ABSTRACT:
A security system controls two sliding (or other) doors 6 and 7 to allow only one door to be opened at a time. A pivoted bolt 13 is pushed by a mechanical link 16 into the opening-path of the door 6 when a lever 15 that abuts the leading-edge of the other door 7 pivots back upon opening movement of that door. A corresponding mechanism includes a link 26 which couples a pivoted bolt 23 to a lever 25 that abuts the door 6, such that the bolt 23 blocks opening of the door 7 when the door 6 begins to open. The mechanical links 16 and 26 may be replaced by hydraulic links.

REFERENCES:
patent: 550810 (1895-12-01), Winkopp
patent: 3174193 (1965-03-01), Smith
patent: 3669038 (1972-06-01), Watson
patent: 3826520 (1974-07-01), Ross et al.
patent: 4011686 (1977-03-01), Jett, III et al.
patent: 4741275 (1988-05-01), Lewiner et al.
patent: 5311166 (1994-05-01), Frye

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