The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1980
Filed:
Mar. 20, 1978
Applicant:
Inventor:
L Nelson Burnett, Jr, Pottstown, PA (US);
Assignee:
Reading Door Closer Corp., Reamstown, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E05F / ;
U.S. Cl.
CPC ...
16 62 ; 16 64 ; 49 13 ;
Abstract
Hydraulic door closer apparatus includes means for counter-balancing the bias of a return spring, to either assist in opening the door by reducing the force needed to open, or, in an alternative embodiment and mode of operation, to open the door by over-balancing the bias of the return spring. In the latter mode, a remotely manually operable switch, such as, for example, a so-called palm button, may initiate opening the door.