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US 5,401,136 AGranted
Wall mover
OwnerLawrence E. Markinventor
Life of this patent
Estimating the term…
Abstract
Lift-clamping device mounted on a movable base for the lifting and transporting of vertically oriented materials. A hinged arm device controlled by an operator using a jack linked to an adjustable clamp mechanism provides a means for lift and support of materials to be transported.
Claims4
A portable lifting device for raising and transporting a load, said device comprising:
- a portable base with wheels;
- a linear actuator having upper and lower ends, said lower end being mounted on said base as to have the linear actuator extensible vertically;
- a pair of arms extending outwardly from said linear actuator, said arms each having a proximal end with a pivot connection mounting said arms to said upper end of said linear actuator, said arms each having a distal end formed with an aperture, said apertures each defining a bearing surface;
- and
- a pair of vertically extending elongated pad means supported on said base, each of said pad means having an inner surface for engaging the load and an outer surface defining a wedge surface for engagement with one of said bearing surfaces of said arm apertures;
- whereby extension of said linear actuator raises said proximal ends of said arms and causes sliding engagement of said bearing surfaces with said wedge surfaces to move said pad means inwardly towards each other until the load is clamped, and further extension of said linear actuator raises the load.
3 more elements
Dependencies are inferred from the claim text.