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. 16, 1991
Filed:
Apr. 11, 1989
Bernd Toepperwien, Rossdorf, DE;
Alfred Teves GmbH, Frankfurt am Main, DE;
Abstract
Working pistons, in particular those of brake boosters, have to tolerate a considerable number of changes in stress and great forces acting on the piston. Simultaneously, it is an object to construct the pistons as light-weight as possible. Due to the considerable forces in the axial direction, it is imperative for the piston to be well secured on the guiding axis. On the other hand, the central guide's projection securing the piston in the axial direction can cause local stresses on the piston and, thus, fatigue in the material which implies a premature failure of the piston. It is an object of this invention to improve the central circumference of the piston no longer is rigidly clamped into the central guide, but rather in that the inner end and the support are designed so as to enable a swivelling motion of the piston plate without local bending stress, thereby the life of the piston being considerably prolonged.