Handling: hand and hoist-line implements – Article carrier gripped and carried by hand – Convertible to – or useable as – different device or different...
Patent
1975-10-24
1976-09-14
Makay, Albert J.
Handling: hand and hoist-line implements
Article carrier gripped and carried by hand
Convertible to, or useable as, different device or different...
294 81R, B62B 106
Patent
active
039801900
ABSTRACT:
The installation of precast concrete paving slabs as used in the construction of paths, patios and swimming pool decks involves heavy and cumbersome lifting, risk of injury to the worker's hands and, using conventional tools, a possibility of breaking and chipping slabs. The task is made more difficult by the close proximity of one slab to the next, a matter of particular significance when it is required to raise and reset an existing installation. In the present invention a wheeled hand barrow supporting a gripping means attached to the slab reduces the lifting load, eliminates dangerous handling, permits slabs to be gripped when closely laid and generally overcomes the aforesaid difficulties. Two flanged jaws, separated by the width of the slab, are hinged to a horizontal extensible beam and may be urged inwardly by an outward thrust imparted to their upper ends by a push rod operating in mutual opposition between the jaws. Tightening of the jaws is achieved by a cam integral with the push rod. By selective extension of the beam and the push rod to one of several lockable lengths, the correct jaw spacing for different standard sizes of paving slabs is provided. The slab is raised and moved by a wheeled hand barrow consisting of a two-bar frame joined by a wheel axle at one end and between the ends by a cross-bar from which the beam is pendulously suspended by a pair of hooked members extending vertically from the beam mid-distance between the jaws. The hooks in cooperation with a latch thereon, are retained in assembly with the barrow or selectivey detached therefrom to facilitate placing and removing the jaws from the slab. A vertically rotative lockable swivel joint is interposed between the beam and the hook to permit the slab to be gripped either longitudinally or transversely with respect to the barrow. The features embodied in the present invention specifically overcome the unique difficulties of installing precast paving slabs for which purpose existing manual tools and lifting or carrying devices are not efficacious.
REFERENCES:
patent: 3273931 (1966-09-01), Caldwell et al.
patent: 3645412 (1972-02-01), Brown
patent: 3885688 (1975-05-01), Larsen
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