Jack

  • US 7,137,615 B2
  • Filed: 03/31/2004
  • Issued: 11/21/2006
  • Est. Priority Date: 03/31/2004
  • Status: Active Grant
First Claim
Patent Images

1. A jack comprisinga base comprising a pair of spaced apart, rigid side members having substantially the same length and being substantially mirror images of each other,each side member having a forward segment, a rear segment, and an inward tapering intermediate segment at substantially the same location along each side member between the forward and rear segments,said forward segments of each side member having substantially equal lengths, said rear segments of each side member having substantially equal lengths, and said intermediate segments of each side member having substantially equal lengths, the lengths of the rear segments being less than the lengths of the forward segments,said forward segments each terminating in a front end and said front ends being opposite each other, said forward segments being substantially parallel to each other and separated by a first predetermined distance and said rear segments being opposite each other and substantial parallel to each other and separated by a second predetermined distance that is less than the first predetermined distance,a stiffening element extending between the front ends of each of said forward segments, said stiffening element serving as an axle having opposed ends with a wheel mounted on each end of the stiffening element outboard of the side members,a substantially horizontally oriented platform having a forward end, a rear end, opposed sides, and an upper surface adapted to support a load in an elevate position with the entire load above ground level, said platform having a width that is substantially equal to said first predetermined distance and a length that is substantially equal to said predetermined length of the forward segments,a first single support arm connected between one side member and the platform and a second single support arm connected between the other side member and the platform, each support arm having one end pivotably connected to the forward end of the platform and another end pivotably connected to the forward segment of the side member to which said support arm is connected,a lift arm having a forward end pivotably connected to the rear end of the platform at a central portion thereof and a rear end pivotably mounted between the rear segments of the side members,a driver assembly mounted between the rear segments of the side members, said driver assembly in response to manual actuation moving said support arms and lift arm substantially in parallel so said platform maintains a substantially horizontal orientation as it moves between lowered and elevated positions.

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