Patents by Inventor William B Leftwich

William B Leftwich 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: 7419204
    Abstract: The powered ramp door lift is used in cargo trailers and other ramp door applications and includes a powered winch assembly, a pair of wire cables or nylon straps connecting the winch assembly to the ramp door, and a “pusher” mechanism. The winch assembly mounted to the trailer header winds and unwinds the cables onto a pair of spools mounted to a drive shaft, which is driven by an electric motor. The “pusher” mechanism prevents the “unspooling” problems that effect the operation of winches in automated ramp door applications. The pusher mechanism engages the ramp door in the closed position and applies an outward force to the ramp door over a small portion of its travel to assist in the initial lowering of the ramp door from the closed position. The winch assembly also includes a cable tension winch shut off mechanism, which deactivates the winch motor in the absence of any tension on cables.
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: September 2, 2008
    Inventors: John R. Coble, Dallis A. Lindley, William B. Leftwich
  • Patent number: 6474124
    Abstract: A cold steel cambering apparatus and method of use, the apparatus comprising, a cambering assembly having a forward-most end and a rearward-most end and therebetween a plurality of adjustable beam guides, each having means to restrain lateral movement of at least one cold steel beam placed on the cambering assembly, with a plurality of guides also having second means to restrain upward movement of at least one cold steel beam placed on the cambering assembly; and at least one hydraulic lift cylinder positioned directly under at least one cold steel beam placed on the cambering assembly with means to impart a concave or upward camber to at least one cold steel beam placed on the cambering assembly over the forward hydraulic cylinder and restrained by the means to restrain lateral and upward movement.
    Type: Grant
    Filed: November 13, 2000
    Date of Patent: November 5, 2002
    Assignee: Banks Corporation
    Inventor: William B Leftwich
  • Patent number: 5771815
    Abstract: A collapsible table for use on motor vehicles such as conversion vans, motorhomes and other recreational vehicles. The collapsible table of the present invention is mounted to the floor of the vehicle and includes a lower frame, an intermediate frame pivotally attached to the lower frame, and an upper frame pivotally attached to the intermediate frame. Both the intermediate frame and the upper frame pivot between a folded position in which the frame is next to its adjacent frame and an extended position in which each frame is spaced from its adjacent frame. The collapsible table includes a latch mechanism for latching the frames in their folded or extended positions. Accordingly, a table surface attached to the upper frame can be placed in a lower position adjacent the floor, an intermediate positions, and a raised position.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: June 30, 1998
    Assignee: Glaval Corporation
    Inventor: William B. Leftwich
  • Patent number: 5697662
    Abstract: A seat support for a motor vehicle includes a mounting plate permanently secured to the floor of the vehicle and a riser releasingly mounted on the mounting plate. The plate and the riser have cooperating sliding surfaces wherein the riser is slidably supported for movement on the plate between released and latch positions. As the riser moves into the latched position, open-ended slots on feet extending from the riser engage pins on the plate, thereby securing the riser to the plate. Primary and secondary locking mechanisms lock the riser on the plate and tighten engagement between the riser and the plate. The locking mechanisms engage semi-resilient sleeves on the pins to prevent rattling.
    Type: Grant
    Filed: February 2, 1996
    Date of Patent: December 16, 1997
    Assignee: Glaval Corporation
    Inventor: William B. Leftwich
  • Patent number: 5348264
    Abstract: A quick release pedestal seat mount to support a passenger seat from the floor of a recreational vehicle includes a base plate for mounting on the floor of the recreational vehicle and a seat mounting box to which a seat may be attached. The seat mounting box may be quickly secured to the base plate by means of a set of hold down cleats which fit engagingly into a complimentary set of hold down openings in the base plate. The seat mounting box is further locked in place by means of a pair of dogs attached to a kick release handle and received into a pair of locking slots in the base plates. A simple tug on the kick release handle disengages the dogs from the locking slots and pulls the seat mounting box rearward, disengaging the hold down cleats. The seat mounting box is further formed so that it will deform under the impact of a frontal collision in such a manner as to cushion the impact of the collision to the seat occupant.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: September 20, 1994
    Assignee: Norco Industries, Inc.
    Inventors: Jeffrey P. Few, William B. Leftwich
  • Patent number: 4639953
    Abstract: A convertible rollover back sofa-bed which includes a wedge member associated with its pivoting linkage system which allows the sofa-bed to swing outwardly as the back of the sofa-bed is pivoted from its sofa position into its bed position.
    Type: Grant
    Filed: December 31, 1984
    Date of Patent: February 3, 1987
    Assignee: Coachmen Industries, Inc.
    Inventors: Terry J. McElmurry, H. Coleman Davis, William B. Leftwich, David Markel
  • Patent number: 4625347
    Abstract: A convertible rollover back sofa-bed which includes a wedge member associated with its pivoting linkage system which allows the sofa-bed to swing outwardly as the back of the sofa-bed is pivoted from its sofa position into its bed position.
    Type: Grant
    Filed: August 21, 1984
    Date of Patent: December 2, 1986
    Assignee: Coachmen Industries, Inc.
    Inventors: Terry J. McElmurry, H. Coleman Davis, William B. Leftwich, David Markel
  • Patent number: D347955
    Type: Grant
    Filed: January 8, 1993
    Date of Patent: June 21, 1994
    Assignee: Norco Industries, Inc.
    Inventor: William B. Leftwich