Handling: hand and hoist-line implements – Hand bars and hand barrows – Opposing jaws
Patent
1996-06-14
1997-11-11
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hand bars and hand barrows
Opposing jaws
294104, 294116, B25B 508, B25G 712
Patent
active
056855850
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the field of clamping tools used in lifting sheets of building materials and in particular relates to a tool having a clamping mechanism whereby a large sheet of material may be held and may be transported by a single person.
BACKGROUND OF THE INVENTION
The building construction industry uses quantities of typically 4 foot by 8 foot sheet materials such as sheets of plywood, particle board, Strandboard.TM., and Gyproc.TM.. Although these sheets of material are frequently handled in bulk with the aid of heavy equipment, individual sheets of such material are always having to be handled manually at some point in the warehousing, retailing, transportation or in construction using those materials. Although individually those sheets of materials are not extremely heavy, they are typically too bulky for one person to easily and safely manage. In particular, when lifting such sheets of material it is typical to place an awkward strain on the back of the person attempting to lift the sheet of material because of the twisting of the torso to grip the material combined with simultaneous bending of the torso and lifting of the material. It is known that lifting, for example, gyproc sheets in this manner may cause or aggravate back injury.
It is an object of this invention to provide a tool designed to assist the building construction industry by enabling a single person to move bulky sheets of materials such as plywood, particle board, strand board, and gyproc which normally require the efforts of two people to safely and conveniently handle.
It is a further object of this invention to provide a tool which may be simply dropped over an edge of the sheet of material to be transported and by the lifting of the material using the handle provided, frictionally gripping the sheet of material in the tool so that the sheet of material may be lifted using the handle.
In the prior art, U.S. Pat. No. 1,479,711, which issued on Jan. 1, 1924 to Haarberg for a "Portable Handle", and Swedish Patent No. 36,090 which issued Feb. 3, 1912, disclose devices for gripping the planar sides of boxes or the like. Those devices comprise a U-shaped bracket and a pivoting handle pivotally mounted along one leg of the bracket whereby raising the handle forces a box engaging lever into gripping engagement with the side of the box contained within the bracket. Engagement of the lever with the box is by means of a piercing or biting point on the end of the lever opposed to the handle. No means is taught nor suggested for providing a pivotable eccentric cam as in the present invention for forcing a non-marring jaw into frictional engagement with a sheet of material held within the U-shaped bracket.
The applicant is also aware of U.S. Pat. No. 3,524,670 which issued on Aug. 18, 1970 to Ilich for a "Sheet Material Carrier" and Canadian Patent No. 1,228,095 which issued Oct. 13, 1987 to Renfrowe for a "Non-marring Lifting Clamp".
Ilich teaches a sheet material carrier having a U-shaped bracket with gripping shoes attached along the legs of the bracket in opposed facing relationship, one of the gripping shoes being translatable towards the other gripping shoe so as to grip a sheet of material therebetween. The translatable gripping shoe is translated by a wedge-like cam surface being forced between the translatable gripping shoe and the corresponding leg of the bracket. The cam surface is driven by the piston-like action of a carrying handle driving the cam surface between the translatable gripping shoe and the bracket leg.
Renfrowe discloses a sheet material lifting device having a clamp body which defines a "U"-shaped slot. Along the sides of the slot are, in opposed facing relationship, opposed jaws, one of which is pivotally mounted for opening and closing movements relative to the other jaw, which is adjustable. The pivotally mounted jaw is urged towards the opposed adjustable jaw, so as to clamp therebetween a sheet of material placed within the slot, by translating a shackle extending from the
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Cherry Johnny D.
Edwards Anthony C.
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