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:
Oct. 06, 1998
Filed:
May. 14, 1996
James A Buckley, Whitefish Bay, WI (US);
James J Dimsey, Brown Deer, WI (US);
Daniel B Conine, Milwaukee, WI (US);
Terry L Kent, Thiensville, WI (US);
Hayes Industrial Brake, Inc., Mequon, WI (US);
Abstract
An apparatus for maintaining hydraulic pressure in a spring applied hydraulicly released brake actuator and activating a parking brake light upon stroking the actuator to apply the parking brake in the system, the apparatus including a housing, a compression spring axially aligned in the housing, a cap mounted on one end of the housing, a cylinder formed in the cap, a piston mounted in the cylinder, a spring cup operatively connecting the piston to the compression spring, the piston rod being operatively connected to the piston and to the brake, a tubular housing having a magnetic switch at each end axially aligned with the piston rod, and a cylindrical tube having a magnet mounted thereon aligned with the tubular housing for actuating one or the other of the magnetic switches, one of the switches being actuated on a drop of pressure in the system and the other switch being operatively connected to a parking brake light to signal a loss of pressure in the system and actuation of the parking brake. In an alternate embodiment of the switch assembly a cylindrical magnet is centered in the cylindrical member and axially aligned with an actuating rod, a pair of switches are mounted in axial alignment in the cylindrical member with sufficient clearance between the actuating rod and the cylindrical magnet to allow for a large angular movement while maintaining close magnet to switch proximity throughout the full stroke of the rod.