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US 4,792,017 AGranted
Adjustable support for ladders, scaffolds and the like
OwnerThomas S. Groveinventor
Life of this patent
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OwnerThomas S. Groveinventor
Estimating the term…
An elongated longitudinally adjustable load-supporting unit attachable to one end of one or both legs of a ladder or at least selected legs of a scaffold to permit using the ladder or scaffold on uneven surfaces, the load-supporting unit comprising an elongated externally-threaded member threadably received within an internally-threaded block-like member split into two similar halves which are pivotally connected adjacent one end and are urged into abutting relationship by spring means, and handle-like members extend respectively in similar directions from the halves of the block-like member and are operable to separate the internally-threaded portions of the block-like member sufficiently to permit free longitudinal movement of the externally-threaded member relative to the pivotally-connected halves of the block-like member. The load-supporting units are connectable to the lower ends of the sides of a ladder or legs of a scaffold between pairs of axially-aligned guide bearings which receive the elongated threaded members therethrough.
An elongated longitudinally-adjustable load-supporting unit comprising in combination, an externally-threaded elongated member of uniform diameter, an internally-threaded member having threads complementary to the external threads of said elongated member, and coengageable therewith for a limited portion of the length of said elongated member, said internally-threaded member being bifurcated and the parts thereof being pivotally-connected for separative movement of said parts, spring means interconnected to said parts in a manner to urge said parts firmly together to effect threaded coengagement of the internal threads thereof with the external threads of said elongated member, and means operable in opposition to said spring means to spread the internally-threaded portions of said parts into a spaced relationship sufficient to permit free relative longitudinal movement between said members.
Dependencies are inferred from the claim text.