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:
May. 03, 1988
Filed:
Mar. 11, 1986
Richard C Bennett, Northbrook, IL (US);
Other;
Abstract
An expandable structure includes a hollow tubular frame having radially outwardly extending portions which define two longitudinally spaced-apart annular channels. Two segmented cylinders are respectively disposed in the channels, each cylinder comprising alternating long and short segments abutting along cam surfaces which lie in planes defining chords of the cylinders. Each long segment is biased inwardly by a spring which bears against the head of a stud which extends radially inwardly from the segment through a complementary opening in the frame. Pusher members are movable axially inside the frame for camming engagement with cam follower lugs which extend radially inwardly from the short segments through apertures in the frame. The pushers are slotted to accommodate the bias spring studs. Means is provided for rotating the frame about its axis.