Title:
SECURITY CLASSROOM FUNCTION LOCK MECHANISM
Document Type and Number:
WIPO Patent Application WO2004015229
Kind Code:
A3
Abstract:
A lock mechanism operated by inner and outer lever handles (74, 36) provides a security classroom function and includes inner and outer lock mechanisms that are independently switchable between locked and unlocked states by inner and outer lock cylinders (200, 60) and keys (202, 60). The inner handle (74) always operates the lock mechanism to retract a latch bolt. The outer handle (36) can only retract the latch bolt when both the inner and outer lock mechanisms are in the unlocked state. The outer key (60) can retract the latch bolt when the inner lock mechanism is in the locked state, but cannot change the inner lock mechanism to the unlocked state or enable the outer handle (36), thereby ensuring positive control over the locked state of the outer handle (36) from the inner side.
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Inventors:
ELLER DARREN C
SORENSEN DAVID A
ZIMMER TODD C
SORENSEN DAVID A
ZIMMER TODD C
Application Number:
PCT/US2003/025063
Publication Date:
August 05, 2004
Filing Date:
August 11, 2003
Export Citation:
Assignee:
SARGENT MFG CO (US)
International Classes:
E05B1/00; E05B55/14; E05B17/00; E05B55/00; E05B63/10; E05B63/14; E05B63/16; (IPC1-7): E05B13/10
Foreign References:
| US2912846A | 1959-11-17 | |||
| US2998274A | 1961-08-29 | |||
| US4869083A | 1989-09-26 | |||
| US3708191A | 1973-01-02 | |||
| US4641867A | 1987-02-10 | |||
| FR1505609A | 1967-12-15 |
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