Lighting control system

• US 4,508,997 A
• Filed: 04/15/1983
• Issued: 04/02/1985
• Est. Priority Date: 05/10/1982
• Status: Expired due to Fees

• Current Assignee: Delmatic Ltd.
• Original Assignee: Delmatic Ltd.
• Inventors: Woodnutt, John P.
• Primary Examiner(s): Dixon, Harold
• Application Number:
  US06/485,244
• Time in Patent Office: 718 Days
• Field of Search: 315/313, 315/321, 315/360, 315/210, 307/96, 307/157
• US Class Current: 315/360
• CPC Class Codes: H02M 5/2576 with digital control
• CPC Class Codes: H05B 47/10 Controlling the light source

Abstract

Lights (LP) are controlled by a control unit (CU) which, in response to a remotely and/or automatically generated signal (MASTER OFF), interrupts the lighting temporarily (preferably by repeatedly flashing them on and off) to provide a warning and switches off the lighting after a delay period unless inhibited by a local switch (S1).

Claims

1. A lighting system comprising

a plurality of lighting sub-circuits;

a master control;

local control units each arranged for operation in response to a signal from the master control to temporarily interrupt the lighting on one or more lighting sub-circuits associated with the respective local control unit during a delay period, to provide a warning, and to switch off the lighting at the end of the delay period; and

a manually-operable switch associated with each local control unit, and actuable during the delay period to inhibit the switching off of said one or more lighting sub-circuits under the control of the respective local control unit.

2. A lighting system according to claim 1 wherein each said local control unit is arranged to provide a warning on the one or more lighting sub-circuits associated with it consisting of repeated interruption of the lighting during some or all of said delay period.