Varying Resistance Patents (Class 213/41)
  • Positional variable orifice pin for hydraulic pressure control in a draft gear
    Patent number: 7311215
    Abstract: A draft gear assembly including a housing having an open front and closed rear portions. A compressible cushioning element is positioned within the rear portion with a seating arrangement abutting one end thereof adjacent the open front portion. A friction cushioning element is provided in the open front portion of the housing. A spring release mechanism continuously urges the friction cushioning element outwardly from the compressible cushioning element thereby releasing such friction cushioning element after compression of such draft gear assembly. A compressible cushioning element includes a hydraulic cylinder having a slidable piston to define a high pressure chamber and a low pressure chamber.
    Type: Grant
    Filed: August 11, 2005
    Date of Patent: December 25, 2007
    Assignee: WABTEC Holding Corp.
    Inventor: Howard Sommerfeld
  • Mask film, its manufacturing method, and manufacturing method of circuit board using the same
    Patent number: 7066344
    Abstract: A mask film includes a base material, a parting layer and a non-parting portion placed on the base material. Accordingly, an optimum adhesion strength of the mask film and a prepreg sheet can be maintained, and peeling between the mask film and prepreg sheet can be prevented. Further, by preventing the fusing adhesion between the mask film and prepreg sheet due to heat generated when forming penetration holes, a circuit board having an excellent quality is obtained.
    Type: Grant
    Filed: January 9, 2003
    Date of Patent: June 27, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshiaki Takenaka, Toshikazu Kondo, Kunio Kishimoto, Shinji Nakamura, Fumio Echigo
  • High capacity draft gear
    Patent number: 6923331
    Abstract: A friction-type draft gear assembly includes a housing having an open front and closed rear portions. A compressible cushioning element is positioned within the rear portion with a seating arrangement abutting one end thereof adjacent the open front portion. A friction cushioning element is provided in the open front portion of the housing. A spring release mechanism is adapted for continuously urging the friction cushioning element outwardly from the compressible cushioning element thereby releasing such friction cushioning element after compression of such draft gear assembly. A compressible cushioning element includes a hydraulic cylinder having a slidable piston to define a high pressure chamber and a low pressure chamber. A metering pin disposed within the piston has aworking portion of a decreased diameter for increasing shock absorbing capacity of such draft gear assembly.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: August 2, 2005
    Assignee: Westinghouse Air Brake Technologies Corporation
    Inventor: Howard Sommerfeld
  • Railcar cushioning device with internal elastomeric spring
    Patent number: 6199708
    Abstract: A railcar cushioning device with a gas charged cylinder and a piston contained in the cylinder for cushioning buff and draft impacts. An elastomer spring is contained in the cylinder between the piston and an end of the cylinder to locate the piston in a neutral position.
    Type: Grant
    Filed: March 5, 1999
    Date of Patent: March 13, 2001
    Assignee: ASF-Keystone, Inc.
    Inventor: Jay P. Monaco