Apparatus for indicating a closure state of a lock

Details Apparatus for indicating a closure state of a lock Apparatus for indicating a closure state of a lock

2005-11-01

2005-11-01

Gall, Lloyd A. (Department: 3676)

Locks

Parts, attachments, accessories and adjuncts

Condition indicators

C070S408000, C070SDIG059, C200S224000

Reexamination Certificate

active

06959568

ABSTRACT:
An apparatus indicates the closure state of a key-operated lock, having a housing that is fitted to the key and has a rotation detection sensor which is held therein and comprises a hollow body that is filled with a first electrically conductive liquid and has electrically conductive contacts for production of electrical contact sequences which are dependent on the closing direction, and having an electronic evaluation unit which uses the contact sequences to determine the closure state of the lock. The hollow body is substantially completely filled with the first electrically conductive liquid and with a second electrically non-conductive fluid that repels the first liquid.

REFERENCES:
patent: 4631943 (1986-12-01), Hoener
patent: 4908605 (1990-03-01), Takatsuka
patent: 5025426 (1991-06-01), Blumberg et al.
patent: 6255957 (2001-07-01), Sonderegger et al.
patent: 32 07 998 (1983-09-01), None
patent: 34 07 033 (1984-11-01), None
patent: 43 27 294 (1994-07-01), None

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