Patents by Inventor John P. Bowyer

John P. Bowyer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Spring brake actuator with hot set spring
    Patent number: 6626083
    Abstract: A spring brake actuator has a sealed spring chamber with a hot set large force compression spring. An alternative embodiment has the hot set spring guided by the actuator rod.
    Type: Grant
    Filed: April 3, 2001
    Date of Patent: September 30, 2003
    Assignee: Haldex Brake Corporation
    Inventor: John P. Bowyer
  • Spring brake actuator with hot set spring
    Publication number: 20020139242
    Abstract: A spring brake actuator has a sealed spring chamber with a hot set large force compression spring. An alternative embodiment has the hot set spring guided by the actuator rod.
    Type: Application
    Filed: April 3, 2001
    Publication date: October 3, 2002
    Inventor: John P. Bowyer
  • Fluid operated brake actuator with internal valve
    Patent number: 5372059
    Abstract: A fluid-operated brake actuator having a hollow actuator rod between a spring chamber of a spring brake housing and a spring chamber of a service brake housing incorporates a valve within the actuator rod. The valve isolates the two spring chambers from each other in normal operation and releases a vacuum in the spring brake housing spring chamber when the spring brake is activated. A separate one-way check valve mounted in a well of the spring brake housing permits fluid to exhaust from the spring chamber to atmosphere and prevents contaminants in the atmosphere from entering the spring chamber.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: December 13, 1994
    Assignee: NAI Anchorlok Inc.
    Inventors: William C. Pierce, John P. Bowyer
  • Spring brake actuator with an annular edge of a diaphragm sealed between a tubular part of a pressure plate and an actuator rod
    Patent number: 5105727
    Abstract: A brake actuating mechanism comprises a housing formed of facing shells with an elastomeric diaphragm suspended between them. A centrally disposed opening in the housing permits an actuating rod disposed within the housing to reciprocate through the opening. The diaphragm also has a centrally disposed opening. A pressure plate having a tubular section engages one side of the diaphragm. A spring is disposed between the pressure plate and the housing. The actuating rod extends through the opening in the diaphragm and is press-fit into the tubular section thereby simultaneously compressing the edge of the opening against the tubular section to form an airtight seal.
    Type: Grant
    Filed: January 4, 1991
    Date of Patent: April 21, 1992
    Assignee: Neway Corp.
    Inventor: John P. Bowyer
  • Adjustable mounting apparatus for air-operated diaphragm brakes
    Patent number: 5016523
    Abstract: An air-operated diaphragm spring brake (10) is provided with a mounting means (16) which permits adjustment of the position of the pneumatic ports (30, 32) on the brake with respect to the vehicle. The mounting means (16) comprises a plate (84) mounted to an end section (88) of a housing (82) overlying a central aperture (90). A pair of threaded mounting studs (96) are fixedly secured to the plate (84) for mounting the plate to the vehicle.
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: May 21, 1991
    Assignee: Anchorlok Corp.
    Inventor: John P. Bowyer
  • Push-rod guide for air-operated diaphragm spring brakes
    Patent number: 5002164
    Abstract: An improvement in a conventional air-operated diaphragm spring brake is provided by a guide (100) being disposed in registry with an aperture (26) in a service brake housing (16). A push-rod (10) extends from a diaphragm (58) within the housing (12) through the bushing (102) to pivotably connect to a slack adjuster (6). The bushing (102) serves to maintain the push-rod (10) at a preselected angle relative to the slack adjuster (6) when the push-rod is in the inoperative position.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: March 26, 1991
    Assignee: Lear Siegler Truck Products Corp.
    Inventor: John P. Bowyer
  • Fluid-operated brake actuator with internal valve
    Patent number: RE36955
    Abstract: A fluid-operated brake actuator having a hollow actuator rod between a spring chamber of a spring brake housing and a spring chamber of a service brake housing incorporates a valve within the actuator rod. The valve isolates the two spring chambers from each other in normal operation and releases a vacuum in the spring brake housing spring chamber when the spring brake is activated. A separate one-way check valve mounted in a well of the spring brake housing permits fluid to exhaust from the spring chamber to atmosphere and prevents contaminants in the atmosphere from entering the spring chamber.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: November 21, 2000
    Assignee: Holland Neway International, Inc.
    Inventors: William C. Pierce, John P. Bowyer