Mechanism for controlling the raising and lowering of a door

• US 5,386,891 A
• Filed: 06/03/1994
• Issued: 02/07/1995
• Est. Priority Date: 03/30/1992
• Status: Expired due to Term

• Current Assignee: Anchuan Corporation
• Original Assignee: Anchuan Corporation
• Inventors: Shea, Tsung-Wen
• Primary Examiner(s): Oberleitner, Robert J.
• Assistant Examiner(s): Poon, Peter M.
• Application Number:
  US08/253,615
• Time in Patent Office: 249 Days
• Field of Search: 188/216, 188/171, 188/166, 188/167, 188/329, 188/330, 188/332, 188/338, 188/339, 188/79.52, 160/1, 160/7, 160/9, 160/88
• US Class Current: 188/171
• CPC Class Codes: A62C 2/242 with fusible links
• CPC Class Codes: E05F 1/02 gravity-actuated , e.g. by use of counterweights
• CPC Class Codes: E05F 11/54 for doors
• CPC Class Codes: E05F 15/59 for overhead wings
• CPC Class Codes: E05F 15/668 for overhead wings
• CPC Class Codes: E05F 15/72 responsive to emergency conditions, e.g. fire
• CPC Class Codes: E05Y 2201/21 Brakes
• CPC Class Codes: E05Y 2201/246 by auxiliary motors, magnets, springs or weights
• CPC Class Codes: E05Y 2201/26 Mechanical friction
• CPC Class Codes: E05Y 2201/266 rotary
• CPC Class Codes: E05Y 2201/41 for closing
• CPC Class Codes: E05Y 2201/434 Electromotors; Details thereof
• CPC Class Codes: E05Y 2201/462 Electromagnets
• CPC Class Codes: E05Y 2201/50 Weights
• CPC Class Codes: E05Y 2201/676 Transmission of human force
• CPC Class Codes: E05Y 2400/3014 Back driving the transmission or motor
• CPC Class Codes: E05Y 2800/414 against high or low temperatures
• CPC Class Codes: E05Y 2900/00 Application of doors, windows, wings or fittings thereof
• CPC Class Codes: E05Y 2900/106 for garages
• CPC Class Codes: E06B 9/74 adapted for selective electrical or manual operation
• CPC Class Codes: E06B 9/82 : automatic
• CPC Class Codes: E06B 9/84 : against dropping

Abstract

A mechanism for controlling the raising and lowering of a door comprising a speed reduction gearing, a high speed input shaft and a low speed output shaft connected to the gearing, and a governor mounted on the input shaft for regulating the input shaft'"'"'s rotational speed. More particularly, the mechanism is provided with a brake having a movable brake shoe, a temperature sensitive link and an elongate member having a central portion coupled to the brake shoe. As well, the first portion of the elongate member is engageable with the temperature sensitive element and a second portion of the elongate member is engageable with the actuator. In this way, the elongate member is provided for moving the brake shoe to the release position in response to one of (1) the temperature sensitive link upon the temperature reaching a predetermined temperature and (2) the actuator.

Claims

1. A brake comprising:

a brake shoe moveable between a braking position for preventing rotation of a shaft and a released position for allowing rotation of said shaft;

temperature sensitive means for detecting a temperature;

an actuator; and

means for releasing said brake shoe comprising an elongate member having a central portion secured to said brake shoe, a first end portion coupled to said temperature sensitive means, a second end portion coupled to said actuator, said elongate member being pivotable about said central portion, said central portion being located substantially midway between said first and second end portions, said means for releasing said brake shoe causing said brake shoe to move from the braking position to the released position in response to one of (1) said temperature sensitive means upon said temperature reaching a predetermined temperature and (2) said actuator.

2. The brake according to claim 1, wherein said second end portion is directly connected to said actuator.

3. The brake according to claim 1, further comprising a movable chain, wherein said means for releasing is further responsive to said movable chain when said movable chain is moved.

4. The brake according to claim 1, wherein said temperature sensitive means comprises a fusible link.

5. The brake according to claim 1, wherein said temperature sensitive means further comprises a mechanical linkage for communicating with said means for releasing.

6. The brake according to claim 1, wherein said actuator is a solenoid.

7. The brake according to claim 1, wherein said actuator is manually operated.