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:
Jan. 03, 1989
Filed:
Jun. 15, 1987
Applicant:
Inventors:
Colin B Willmott, Buffalo Grove, IL (US);
James S Chang, Arlington Heights, IL (US);
Assignee:
The Chamberlain Group, Inc., Elmhurst, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E05F / ;
U.S. Cl.
CPC ...
49199 ; 49360 ; 474140 ; 474160 ;
Abstract
An adjustable speed garage door operator which has a longitudinal rail with a trolley mounted on the rail and connected to a door to open and close it. A chain is connected to the trolley and is mounted on a front idler sprocket and can be selectively mounted on different drive sprockets which have different numbers of teeth so as to vary the speed of the door.