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:
Apr. 21, 1992
Filed:
Dec. 31, 1990
Robert S Sporzynski, Chelsea, MI (US);
Anthony C Evans, Northville, MI (US);
Kelsey-Hayes Company, Romulus, MI (US);
Abstract
A disc brake piston is formed from a stamping operation and is preferably constructed from stainless steel. The piston includes a hollow cylindrical body having a closed end and an open end. In one preferred embodiment, the open end is provided with a radially outwardly extending flange which defines an annular abutment surface for engaging a backing plate of a disc brake shoe. An integral boot groove is formed in the cylindrical body adjacent the open end thereof, and produces a raised portion on an inner surface of the body portion directly opposite the groove. This results in the piston having a substantially uniform wall thickness throughout the entire length of the cylindrical body. Also, the piston can include a dome-shaped recess formed in the closed end thereof, which can be provided with radial strengthening ribs.