SIDNEY EUGENE FROMBERG
Pilots in Lancaster, CA
License number
California A0633797
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
PO Box 2575, Lancaster, CA 93539
Professional information
Security Door Lock Arrangement With Magnetically Operated Switch In The Closed Door Position
US Patent:
5925861, Jul 20, 1999
Filed:
Apr 2, 1997
Appl. No.:
8/831926
Inventors:
Sidney Fromberg - Lancaster CA
International Classification:
H01H 316, H01H 900
US Classification:
200 6167
Abstract:
A security lock for a door type structure in which a latch extends between the movable door and the fixed jamb. A magnet is contained within the latch and a switch is positioned in the jamb. The magnet passes into switch operating relationship to the switch for the condition of the door closed. When the magnet is moved out of the switch operating relationship to the switch, which occurs prior to the door being opened, the change in the magnetic flux causes the switch to generate an information signal which indicates that an attempt to open the particular door has been made.