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. 07, 2003
Filed:
May. 17, 2001
Seigo Hasunuma, Gunma, JP;
Hosiden Corporation, Osaka, JP;
Abstract
In a keyboard switch including a pantograph mechanism comprising a U-shaped link having a pair of stud shafts C rotatably and movably supported in bearing portions B of a base and a link including a frame-like portion A and having a pair of stud shafts D rotatably supported in bearing portions C ofthe base , ribs F having tapered surfaces G are provided along the peripheral surfaces of bosses D defining the center of rotation of the link while holes E in the link for mating with the bosses D are formed with keyways F. When a force tending to pull the keytop up further from it returned original position is applied to the keytop, the tapered surfaces G and the angular edges of the keyways F are forced into contact with each other. This urging force in turn urges the opposed legs B of the link to expand apart from each other in the directions indicated by the arrows , whereby the link is prevented from dislodging from the base