Dewayne H Meyer

US Patent:

49090534, Mar 20, 1990

Filed:

May 17, 1988

Appl. No.:

7/195554

Inventors:

Walter O. Zipf - Columbus OH
Jack E. Zipf - Columbus OH
Kenneth W. Wheatley - Dublin OH
Dewayne H. Meyer - Westerville OH

Assignee:

Liberty Telephone Communications, Inc. - Westerville OH

International Classification:

E05B 4706

US Classification:

70283

Abstract:

A High Security Door Locking Device comprises a locking cylinder including a latch control cam rotatably operable by a properly formed key received within the cylinder. An electrical solenoid is inserted into the rear of the cylinder with a retractable core which interferes with the operation of the latch control cam when the solenoid is unoperated. A solenoid controller is connected to operate the solenoid in response to entry of a defined code into the solenoid controller to thereby permit operation of the latch control cam. The solenoid controller operates the solenoid only for a selected period of time in response to the entry of a defined code such that a valid code must once again be entered into the controller if the cylinder is not operated during the enabled time period. The solenoid controller is programmable to permit a master user to disable codes to exclude the entry of previously authorized persons and to enable codes to permit the entry of newly authorized persons such that the cylinder does not have to be rekeyed to prevent entry of persons having a currently valid key but who are not authorized to enter the premises locked by the high security locking device.