Combination manual and electric door opener

• US 5,375,374 A
• Filed: 12/06/1993
• Issued: 12/27/1994
• Est. Priority Date: 12/06/1993
• Status: Expired due to Fees

• Current Assignee: Harry Rohraff Sr
• Original Assignee: Harry Rohraff Sr
• Inventors: Rohraff, Harry Sr.
• Primary Examiner(s): KANNAN, PHILIP
• Application Number:
  US08/162,713
• Time in Patent Office: 386 Days
• Field of Search: 49/340, 49/339, 49/139, 49/140, 49/280, 49/25
• US Class Current: 49/340
• CPC Class Codes: E05F 15/622 using screw-and-nut mechanisms
• CPC Class Codes: E05F 15/63 operated by swinging arms
• CPC Class Codes: E05Y 2900/132 Doors

Abstract

A combination manual and electric door opener having a bracket mounted to a door frame at a hinged side of the door. An electric motor is connected to the bracket and in turn connects to a threaded rod. A threaded nut is positioned around the threaded rod. Connected to the threaded rod is a cam arm. Upon engagement by the motor, the threaded nut rotates in a translational direction along the threaded rod. The cam arm is pivoted about a pivot point fastened to the top of the doorway and engages a closed door. The door is thus pivotally acted upon until it is in an open position.

Claims

1. An apparatus for opening and closing a door connected to a door frame, comprising:

a bracket fastened to the door frame;

a bi-directional electric motor attached to said bracket, said motor having a rotatable output shaft extending therefrom;

means activated by said rotary output shaft of said bi-directional motor for pivotally displacing said door between a closed and an open position, said means for pivotally displacing said door comprises a threaded rod having one end longitudinally attached to said output shaft, a threaded nut threadably received on said threaded rod;

said threaded nut translatable along said threaded rod Upon the rotation of said threaded rod by said bi-directional electric motor;

a cam lever having a first end fastened to said threaded nut, said cam lever having a first arm and a second arm extending at an angle relative to said first arm, said second arm extending generally parallel to said door when said door is in a closed position, said second arm of said cam lever terminating at a second end at a point adjacent to said closed door; and

portable control means for activating said bi-directional electric motor from a remote location.

2. The door opener as described in claim 1, further comprising a first pivot pin attached to said threaded nut which is pivotably received in an aperture provided in said first arm of said cam lever and a first snap ring fastening said first arm to said threaded nut.

3. The door opener as described in claim 1, further comprising a roller fastened to said second end of said cam lever by a second pivot pin and a second snap ring locking said roller to said second end of said second arm, said roller engageable with the surface of said door so as to open said door when said bi-directional electric motor rotates in a first direction.

4. The door opener described in claim 3, wherein said bi-directional motor rotates said output shaft in a second direction to return said door to a closed position.

5. The door opener as described in claim 3, further comprising a restraining bracket mounted to said door, said bracket surrounding said roller and maintaining contact between said roller and said door during opening and closing of said door.

6. The door opener as described in claim 1, wherein said means for activating said door opener includes a junction box secured to said door frame at a first side of said door, said junction box electrically connected to said bi-directional electric motor.

7. The door opener as described in claim 6, further comprising a retractable door latch disposed on said second side of said door, said latch engaging said door frame to latch said door in a closed position, said latch further communicating by a second line with said junction box so as to disengage said door concurrently with the energizing of said electric motor.

8. The door opener as described in claim 7, comprising in addition a timing chip in said junction box, said chip terminating said electric motor when said door is in an open position.

9. The door opener as described in claim 8, comprising in addition a portable control for operating said door opener, said control emitting a radio signal to activate said door opener, said signal received by said junction box.