Claims
- 1. A method of constructing a damper comprising the steps of:
- (a) forming at least one blade having at least two parallel offset surfaces joined by a transverse blade portion;
- (b) stamping hook-shaped hinge portions in only opposite ends of said blade;
- (c) providing a frame having an inwardly depending flange thereon which is notched on opposite sides thereof and is provided with hinge elements to receive and coact with said hook-shaped hinge portions; and
- (d) assembling said blade into said frame to produce a damper wherein a seal is formed between overlapping portions of said parallel offset portions and opposite surfaces of said flange when the damper is in the closed position, said opposite surfaces being formed in spaced planes.
- 2. A method of constructing a damper comprising the steps of:
- (a) forming at least one blade, said blade having at least two parallel offset surfaces joined by a transverse blade portion;
- (b) notching the opposite ends of said blade to form notched portions and forming the notched portions of said blade into hook-shaped hinge portions;
- (c) providing a frame having an inwardly depending flange thereon which is notched on opposite sides thereof and is provided with hinge elements to receive and coact with said hook-shaped hinge portions; and
- (d) assembling said blade into said frame to produce a damper wherein a seal is formed between overlapping portions of said parallel offset portions and opposite surfaces of said flange when the damper is in the closed position, said opposite surfaces being formed in spaced planes
- 3. A method as claimed in claim 2, wherein said notching and forming of said blade into said hinge portions is conducted by stamping said blade.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a division of application Ser. No. 729,831 filed Oct. 4, 1976, now U.S. Pat. No. 4,113,232, issued 9/12/78, which is a continuation-in-part of my prior co-pending patent application Ser. No. 689,994, filed May 26, 1976 , now U.S. Pat. No. 4,081,173, issued March 28, 1978 entitled "ROTATING BLADE FIRE DAMPER" which application is incorporated by reference as if fully set forth herein. The present invention is further related to co-pending patent application Ser. No. 874,001, filed Jan. 31, 1978, now patent No. 4,165,629, and entitled "Multi-Punch, Multi-Die Assembly for Stamping Hook Shaped Damper Hinge Members".
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
Country |
907 OF |
Jan 1904 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
729831 |
Oct 1976 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
689994 |
May 1976 |
|