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. 15, 1991
Filed:
Nov. 24, 1989
Thomas F Prince, Milton, MA (US);
Other;
Abstract
An electric switch design compensates for unprodictable but significant variability, within a known range, in case and cover material shrinkage during manufacture. A contact actuator has radially spaced guide bosses and an axial barrel providing a plurality of external axially extending sharp bearing ridges. Case guide structure cooperates with the actuator guide bosses to permit actuator travel generally normal to the case floor. The actuator is dimensioned with respect to the case guide structure to accommodate the unpredictable case material shrinkage variability and thereby to permit actuator play in which the actuator axis is rotatable out of the normal to the case floor. The switch cover provides an actuator collar having an inner, surface coaxial with the normal to the case floor and dimensioned with respect to the actuator barrel such that for all shrinkage values within the known range, the actuator barrel bearing ridges interfere with the collar inner surface for reduction of actuator play with minimal friction between barrel and actuator collar.