Patents by Inventor Douglas C. Armstrong

Douglas C. Armstrong 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).

  • Patent number: 7168541
    Abstract: A manual planetary power transmission includes two planetary gearsets and three torque-transmitting synchronizer assemblies. Two of the synchronizer assemblies permit the control of one gear member of the planetary gearsets individually. The third synchronizer permits control of two of the planetary gear members individually or simultaneously. The three synchronizer assemblies are manipulable in combinations of three to provide six forward speed ratios and one reverse speed ratio in the planetary gearsets.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: January 30, 2007
    Assignee: General Motors Corporation
    Inventors: Raymond J. Haka, Paul D. Stevenson, Douglas C. Armstrong
  • Patent number: 6811010
    Abstract: A synchronizer clutch assembly includes an input driver member having a shift collar disposed thereon. A plurality of driven members are included in the synchronizer assembly and are operatively connected by the shift collar to provide at least three drive paths from the input driver member to one or more of the output driven members.
    Type: Grant
    Filed: November 19, 2003
    Date of Patent: November 2, 2004
    Assignee: General Motors Corporation
    Inventor: Douglas C. Armstrong
  • Patent number: 4881453
    Abstract: A self contained servo mechanism (10, 110) for actuating a friction band assembly (13) in a planetary gear set. The servo mechanism (10, 110) is contained within a housing (25, 125) which incorporates a piston chamber (32, 132). The housing (25, 125) is demountably secured within a socket cavity (21, 121) provided in the transmission case (11, 111). A piston means (40, 140) is slidably received within the chamber (32, 132), and the piston means (40, 140) is operatively secured to an actuating pin (55, 155) that is slidably received within a pilot bore (34, 134) which penetrates the housing (25, 125) and which is aligned with the piston chamber (32, 132). The actuating pin is, in turn, operatively connected to a friction band assembly (13) within the transmission case (11, 111).
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: November 21, 1989
    Assignee: General Motors Corporation
    Inventor: Douglas C. Armstrong
  • Patent number: 4659044
    Abstract: A kit (1) for assembling into a mount (20) for attachment to a spar (21) to support a radar antenna (26) including port and starboard side plates (2), a base plate (3), a plurality of compression tubes (4) and a plurality of threaded fasteners (5). The mount assembled from the kit has the base plate attached to the port and starboard side plates, the side plates attached to the spar, and the compression tubes fastened between the side plates by the threaded fasteners to thereby form a rigid structure capable of supporting a radar antenna.
    Type: Grant
    Filed: September 26, 1985
    Date of Patent: April 21, 1987
    Inventor: Douglas C. Armstrong
  • Patent number: 4473024
    Abstract: A self-locking covering device (15, 16) for standing rigging (3, 4, 6) of a boat consisting of first and second elements adapted to be positioned about the standing rigging and including mating tongues and grooves which, upon engagement, hold the two elements together in a self-locking condition.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: September 25, 1984
    Inventor: Douglas C. Armstrong