Security device for garage doors

Claim 2

In combination with a door movable in a fixed frame between open and closed positions and a security device comprising a locking pin longitudinally movable between said frame and means forming an aperture in said door, the aperture being registrable with and accepting said pin in locking engagement therewith when said door is in said closed position, an electric motor in said security device having an output shaft and an arm mounted transversely thereon for rotation therewith, said shaft having resilient means biasing said arm toward a first rotational position and being rotatable by said motor to a second rotational position; and linkage means between said arm and said pin for transforming rotational movement of said arm to longitudinal movement of said pin, said linkage means moving the pin into locking engagement with said door aperture when said shaft is in its first position and said door is in its closed position, and removing said pin from said aperture upon actuation of said motor and rotation of the shaft to its second position.

Claim 3

The combination of claim 1, wherein said arm is mounted on said output shaft by a set screw, said screw being removable in case of power failure to permit manual unlocking of the door by rotation of said arm independently of said motor output shaft.

Claim 4

The combination of claim 1, further comprising circuit means including: a voltage source; a secure switch in series across said voltage source with a parallel circuit having in a first branch thereof a first coil of a relay and a first normally open limit switch and in a second branch thereof a second coil of said relay and a second normally open limit switch, said secure switch being a normally open momentary contact switch, said first limit switch being closed by engagement by said pin's moving into locking engagement with said door, said second limit switch being closed by engagement with said pin upon movement thereof to an open position, and said relay coils moving a motor switch selectively to closed and open positions upon actuation thereof by simultaneous closing of the secure switch and one of the first and second limit switches, respectively; and a motor actuation circuit comprising means connecting said motor across said voltage source in series with said motor switch, thereby to close said motor switch to actuate said motor and move said locking pin from said door upon closing of said secure switch when said first limit switch is closed, and to deactuate said motor by opening said motor switch upon closing of said secure switch when said second limit switch is closed, allowing said resilient means to rotate said arm and shaft and to move said pin into locking engagement with said door.

Claim 5

The combination of claim 4, further comprising a secure lockable housing enclosing said motor, said secure switch, and said linkage means and fastened to said fixed frame adjacent said door.

Claim 6

The combination of claim 3, wherein said secure switch is a momentary contact responsive to a radio receiver, said contact being actuable only by a selected radio frequency signal.

Claim 7

The combination of claim 4, wherein said secure switch is a key-operated momentary contact switch.

Claim 8

The combination of claim 1, wherein said motor shaft has a slow throw from first to second positions approximating 20 seconds.

Claim 9

The combination of claim 1, further comprising in a parallel circuit across a voltage source: a first-colored lamp and a first normally-closed contact in series therewith; and a second-colored lamp and a second normally-open momentary contact switch in series therewith, the voltage source being switched between said first and second contacts upon full withdrawal of the pin from the aperture in said door to extinguish said first-colored lamp and to light said second-colored lamp to indicate that the door may be opened.