Lift assembly for blocks and method of lifting blocks
AssigneeConstruction Specialties, Inc.
InventorThomas F. Donnelly
Life of this patent
Estimating the term…
Abstract
Lifting apparatus for lifting, conveying and/or positioning blocks or slabs, such as blocks or slabs made of concrete, masonry, stone, brick, or similar materials, and methods of lifting, conveying and/or positioning such materials. The lifting apparatus may include two spaced block supporters that are positioned or positionable to respectively mechanically engage a block or slab to support the same mechanically. Upon biasing the two spaced block supporters, the block is engaged and its weight supported, and the block may be lifted, conveyed and/or positioned at a desired location. Unbiasing the block supporters releases the block. A plurality of lifting apparatuses may be used together, including in modular form.
Claims15
A method of lifting from a surface a block having first and second external walls and a top surface, comprising:
- positioning respective first and second supporters of a lifting apparatus alongside first and second external walls of the block in a first block release position, said lifting apparatus including one or more block stabilizers;
- moving the first and second supporters to a second block support position, causing the first and the second supporters to position underneath said block to support said block;
- stabilizing said block by causing said one or more block stabilizers to engage said top surface of said block;
- and
- raising the lifting apparatus to lift the block off of the surface.
A method of lifting from a surface a block having an internal void and a top surface, comprising:
- positioning a first supporter of a lifting apparatus in said internal void of the block, the internal void being defined by at least one internal wall of the block, said lifting apparatus including one or more block stabilizers;
- positioning a second supporter of said lifting apparatus to engage an external wall of the block, the first and second supporters being in a first block release position;
- moving the first and second supporters to a second block support position underneath said block;
- causing said one or more block stabilizers to engage said top surface of said block and stabilize said block;
- and
- raising the lifting apparatus to lift the block off the surface.
A method of lifting from a surface a block having an internal void and a top surface, comprising:
- positioning a first supporter of a lifting apparatus in said internal void of the block, the internal void being defined by at least one internal wall of the block, said lifting apparatus including one or more block stabilizers;
- positioning a second supporter of said lifting apparatus in said internal void of the block, the first and second supporters being in a first block release position;
- moving the first and second supporters to a second block support position underneath said block;
- causing said one or more block stabilizers to engage said top surface of said block and stabilize said block;
- and
- raising the lifting apparatus to lift the block off the surface.
A lifting apparatus, comprising:
- a main frame comprising an alignment bar, a pair of spaced alignment plates attached to said alignment bar, and a pair of spaced scissor attachment brackets attached to said alignment bar;
- first and second mechanical scissor grips pivotally attached to said scissor attachment brackets, the first and second mechanical scissor grips being movable between an unengaged position and an engaged position;
- and
- a handle cooperating with said first mechanical scissor grip and configured for manual actuation of said first mechanical scissors grip between said unengaged and engaged positions.
A modular lifting assembly for lifting a plurality of blocks off of a surface, said modular lifting assembly comprising a plurality of block lifting units, each of said block lifting units comprising:
- a main frame comprising an alignment bar, first and second spaced alignment plates attached to said alignment bar, and a pair of spaced scissor attachment brackets attached to said alignment bar;
- first and second mechanical scissor grips pivotally attached to said scissor attachment brackets, the first and second mechanical scissor grips being movable between an unengaged position and an engaged block supporting position;
- wherein the first spaced alignment plate of one of said plurality of block lifting units is coupled to a second alignment plate of another one of said plurality of block lifting units to position the block lifting units in side-by-side relation.
Dependencies are inferred from the claim text.