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:
Mar. 26, 1991
Filed:
Dec. 14, 1989
Tadayoshi Shirai, Hamamtsu, JP;
Masaji Yamamori, Nagoya, JP;
Ishikawa Tekko Kabushiki Kaisha, Tokyo, JP;
Abstract
A method for providing a dust-proof boot for a protruding equipment shaft of the type including a pair of spaced apart annular grooves. The boot includes an expandable central belly portion, a pair of restricted diameter attachment ring portions adapted to be received in the shaft grooves, and a pair of connecting portions connecting the attachment ring portions to the belly portion. It is formed by first forming a parison on a male die. The parison includes preformed attachment ring portions and connecting portions, at least one of which includes an inwardly protruding annular ridge member which is received in a mating recess in the die. The parison and the male die are inserted into a female blow-molding, die, with the preformed attachment ring portions and connecting portions caught and supported between the male and female dies. The belly portion of the boot is next formed by blow molding, during which step the ridge members are urged into sealing relation with wall portions of the male die grooves, thus preventing distortion of the preformed attachment ring portions.