Home security and garage door operator system

• US 4,433,274 A
• Filed: 07/27/1981
• Issued: 02/21/1984
• Est. Priority Date: 04/14/1980
• Status: Expired due to Fees

• Current Assignee: Dean Duhame
• Original Assignee: Dean Duhame
• Inventors: Duhame, Dean C.
• Primary Examiner(s): Truhe, J. V.
• Assistant Examiner(s): Evans, A.
• Application Number:
  US06/287,336
• Time in Patent Office: 939 Days
• Field of Search: 49/13-14, 49/31, 49/141, 49/199, 318/16, 318/283-286, 318/445, 318/450, 318/466-468, 318/471-473, 340/627, 340/628, 340/629, 340/630, 340/634
• US Class Current: 318/283
• CPC Class Codes: G08B 17/117 by using a detection device for specific gases, e.g. combustion products, produced by the fire G08B17/103, G08B17/11 take precedence

Abstract

A home security and garage door operator system includes a gas sensor for detecting the level of toxic gas in the garage. When the gas level exceeds a predetermined threshold the garage door is automatically opened. Lock out circuitry is provided for preventing the door from being accidentally closed as long as the gas sensor detects an excessive level of toxic gas in the garage. A two button transmitter is used to sequentially close the garage door and set a security alarm subsystem. Warning devices are activated if the security alarm is attempted to be set without the garage door and windows in the home being closed. Once the security alarm has been set, the lock out circuitry also disables the garage door motor control circuitry until the security alarm is first deactivated. The transmitter generates a digital pulse train according to a preselected code, with the operation of the dual buttons changing the state of a particular control bit in the pulse train. A central control module in the garage includes a receiver with channel monitoring circuitry designed to detect the state of the control bit to initiate different functions, for example, the setting of the security alarm and the actuation of the garage door. The system further includes a heat sensor in the central control module and advantageously uses a line carrier to transmit status information regarding the monitored parameters to a remote module in the home. A maximum run timer and motor overload protection for the motor control circuitry are also disclosed.

Claims

1. In a garage door operator of the type having a door drive motor, an overload switch for the motor, an integrated security alarm system, and a power supply normally connected to both the motor and the alarm system, the improvement comprising:

circuit means interconnecting the power supply, the motor, the overload switch and the alarm system including detector means for monitoring the condition of the overload switch and providing a first logical signal level to the motor and to the alarm system to maintain normal operation thereof but responsive to the opening of said overload switch to provide a second logical signal level which selectively disables only the motor.