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:
May. 04, 1993
Filed:
Jul. 23, 1992
Wayne A Hewitt, LaPorte, IN (US);
Allied Signal Inc., Morristown, NJ (US);
Abstract
A diaphragm for a brake booster having an annular inner bead with first and second radial surfaces separated by an apex. The second radial surface has a plurality of indentations that extend from the apex. In response to a positive pressure differential created by vacuum in a first chamber and air in a second chamber, an output force is developed to effect a brake application corresponding to an input force. This positive pressure differential act on the annular bead to urge said first radial face into engagement with a wall to prevent communication between the first and second chambers during a brake application. In the absence of the presence of vacuum in the first chamber, the input force acts on the wall to develop an operational pressure in the first chamber to develop a negative pressure differential between the first and second chambers. This negative pressure differential acts on the diaphragm to rotate the annular inner bead about the apex to move the first radial face away from the wall and allow communication between the first and second chambers through the indentations to attenuate the negative pressure differential and allow an input force to effect the brake application.