ELECTRIC CONTROL MOTOR DRIVEN LOCK MECHANISM

• US 3,854,310 A
• Filed: 03/07/1974
• Issued: 12/17/1974
• Est. Priority Date: 01/07/1972
• Status: Expired due to Term

• Current Assignee: Paul A. Crafton, Stephen Paull
• Original Assignee: Paul A. Crafton, Stephen Paull
• Inventors: Paull, Stephen, Crafton, Paul A.
• Primary Examiner(s): Franklin, Jordan
• Assistant Examiner(s): Nerbun, Peter
• Application Number:
  US05/449,134
• Time in Patent Office: 285 Days
• Field of Search: 70/280,277,279,264 318/287,293 74/626
• US Class Current: 70/280
• CPC Class Codes: E05B 2047/002 Geared transmissions
• CPC Class Codes: E05B 2047/0026 Clutches, couplings or braking arrangements
• CPC Class Codes: E05B 47/0012 with rotary electromotors actuators with rotary electromotors per se H02K7/06, H02K23/68
• CPC Class Codes: Y10T 292/1082 Motor
• CPC Class Codes: Y10T 70/65 Central control
• CPC Class Codes: Y10T 70/7113 Projected and retracted electrically

Abstract

An electric control motor driven lock mechanism, for primary use with a door, in which a sector bolt is driven by an electric motor through a worm gear. The operation of the driving motor is controlled by a logic circuit having a plurality of inputs. The inputs to the logic circuit include not only an electronic combination or other operating signals, but also signals from limit switches which indicate that the door is fully opened, fully closed or that the motor is in the process of operating. The use of an irreversible worm/worm gear coupling prevents the sector bolt from driving the motor and therefore the sector bolt can only be opened when the motor is energized to open the bolt. In an alternate embodiment the worm drives the sector bolt through a differential gear. A manual drive is applied to a second input of the differential gear, thereby enabling the mechanism to be manually operated in the event of a power failure.

Claims

1. An electrically controlled motor driven lock mechanism, comprising:

a. a sector bolt rotatable between a locked and an unlocked position, b. a reversible electric motor having a shaft, c. a worm connected to the motor shaft, d. a worm gear driven by the worm and connected to the sector bolt, wherein the gear ratio between the worm and worm gear is such that the worm will only rotate when a rotative force is applied to the motor shaft, e. a door, wherein said sector bolt is mounted on said door, f. a door frame for receiving said door, said door frame having a notch means thereon, g. said sector bolt having a recess means thereon such that when said sector bolt is in a locked position said recess means receives said notch means, h. a motor current control circuit means for controlling the direction of current through said motor and thereby the direction of rotation of the shaft of said motor;

i. a first logic circuit means having a plurality of AND gates with inverted outputs for generating a first output, said first ouptut being applied to said motor current control circuit means, whereby when said first logic circuit means generates an output said motor current control circuit means causes the rotation of said motor shaft in a direction to cause said sector bolt to rotate to said unlocked position;

j. a second logic circuit means having a plurality of AND gates, with inverted outputs for generating a second output, said second output being applied to said motor current control circuit means, whereby when said second logic cirucit means generates an output, said motor current control circuit means causes the rotation of said motor shaft in a direction to cause said sector bolt to rotate to said locked position;

k. a first sensing means for senSing when said sector bolt is in said unlocked position and for preventing said first logic circuit from generating an output when said unlocked position is sensed;

l. a second sensing means for sensing when said sector bolt is in said locked position and for preventing said second logic circuit from generating an output when said sector bolt is in said locked position and, m. a third sensing means for sensing when said door is not received in said door frame and for preventing said second logic circuit means from generating an output when said door is not received in said door frame.

2. The apparatus of claim 1 wherein said motor current circuit control means further comprises:

a. a command signal circuit means for generating an output, said output being applied to said first logic circuit means whereby said first logic circuit means will generate an output when said output from said command signal circuit means is applied thereto;

b. an interior unlock switch means for causing said first logic circuit means to generate an output; and

c. an interior lock switch means for causing said second logic circuit means to generate an output.

3. The apparatus of claim 2 wherein said interior lock switch means comprises a switch having a first and second position whereby when in said first position said second logic circuit means will generate an output when said door is received in said frame and when in said second position said second logic circuit means will be prohibited from generating an output when said door is received in said frame;

said switch thereby acting as a dead bolt on said door to lock said door when said door is received in said frame.

4. The mechanism claimed in claim 1 wherein the worm gear is connected to the sector bolt through a differential gear, and further comprising manually operable means for driving the differential gear.

5. The mechanism claimed in claim 4 wherein the manually operable means comprises a manually driven worm, and a worm gear driven by the worm and coupled to the differential gear.

6. An electrically controlled motor driven lock mechanism, comprising:

a. a sector bolt rotatable between a locked and an unlocked position, b. a reversible electric motor having a shaft, c. a worm connected to the motor shaft, d. a worm gear driven by the worm and connected to the sector bolt, wherein the gear ratio between the worm and worm gear is such that the worm will only rotate when a rotative force is applied to the motor shaft, e. a door frame, wherein said sector bolt is mounted on said door frame, f. a door, fitted to be received by said door frame, said door having a notch thereon, and g. said sector bolt having a recess means thereon such that when said sector bolt is in a locked position said recess means receives said notch means, h. a motor current control circuit means for controlling the direction of current through said motor and thereby the direction of rotation of the shaft of said motor;

i. a first logic circuit means having a plurality of AND gates with inverted outputs for generating a first output being applied to said motor current control circuit means, whereby when said first logic circuit means generates an output said motor current control circuit means causes the rotation of said motor shaft in a direction to cause said sector bolt to rotate to said unlocked position;

j. a second logic circuit means having a plurality of AND gates with inverted outputs for generating a second output, said second output being applied to said motor current control circuit means, whereby when said second logic circuit means generates an output, said motor current control circuit means causes the rotation of said motor shaft in a direction to cause said sector bolt to rotate to said locked position, k. a first sensing means for sensing when said sector bolt is in said unlocked position and for preventing said first logic circuit from generating aN output when said unlocked position is sensed;

7. The apparatus of claim 6 wherein said motor current circuit control means further comprises:

a. a command signal circuit means for generating an output, said output being applied to said first circuit means whereby said first logic circuit means will generate an output when said output from said command signal circuit means is applied thereto;

b. an interior unlock switch means for causing said first logic circuit means to generate an output; and

c. an interior lock switch means for causing said second logic circuit means to generate an output.

8. The apparatus fo claim 6 wherein said interior lock switch means comprises a switch having a first and second position whereby when in said first position said second logic circuit means will generate an output when said door is received in said frame and when in said second position said second logic circuit means will be prohibited from generating an output when said door is received in said frame;

said switch thereby acting as a dead bolt on said door to lock said door when said door is received in said frame.

9. The mechanism claimed in claim 6 wherein the worm gear is connected to the sector bolt through a differential gear, and further comprising manually operable means for driving the differential gear.

10. The mechanism claimed in claim 6 wherein the manually operable means comprises a manually driven worm, and a worm gear driven by the worm and coupled to the differential gear.