Patents by Inventor Lawrence E. Murray

Lawrence E. Murray 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: 4076104
    Abstract: A safety latch preventing inadvertent lowering or dropping of an automotive hoist by means of a torsionally biased pawl shaft that automatically self engages with a lateral notch located in the lift at hoist operating height. The backside of a vertically movable gear rack attached to the hoist includes the pawl notch near its lower end and which when raised cooperates with the pawl shaft for effecting a latching relation therewith. The pawl shaft is slotted to embrace the gear rack and is manually releasable for permitting hoist descent by a partial rotation which in one embodiment is effected by manually shifting a bi-stable locking rod. Reset for latching on subsequent ascent of the gear rack is effected by descending engagement of the hoist bolster against the bi-stable locking rod. In an alternative embodiment release is obtained by raising a lift pin which similarly effects partial rotation of the biased pawl shaft.
    Type: Grant
    Filed: February 18, 1977
    Date of Patent: February 28, 1978
    Assignee: Dresser Industries, Inc.
    Inventors: Burton DeWolfe Bishop, Lawrence E. Murray