Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
173 words
A carrying device arranged to permit a workman to easily lift and transport large sheets of construction material such as plywood, wallboard and the like, comprising: a substantially U-shaped lower frame member having arms defining a plane against which a sheet of material may be placed and a crossbar, offset from said plane, forming a lower lifting region; a substantially U-shaped upper frame member joined to the lower frame member and having a crossbar offset from said plane and forming an upper lifting region and having mounting arms adjacent to said plane; cam means mounted eccentrically upon said mounting arms adjacent said plane, said cam means gravitationally rotating into gripping engagement with a sheet of material placed against said plane, and being rotated into tighter gripping engagement by gravitational forces exerted on the sheet of material as the frame members are lifted upwardly; the cam means including a pair of cams mounted opposite the lower frame arms and rotatable into engagement therewith, the cams being joined for tandem motion by a connecting rod.
Claim 2
Dependent Claim
173 words
A carrying device arranged to permit a workman to easily lift and transport large sheets of construction material such as plywood, wallboard and the like, comprising: a substantially U-shaped lower frame member having arms defining a plane against which a sheet of material may be placed and a crossbar, offset from said plane, forming a lower lifting region; a substantially U-shaped upper frame member joined to the lower frame member and having a crossbar offset from said plane and forming an upper lifting region and having mounting arms adjacent to said plane; cam means mounted eccentrically upon said mounting arms adjacent said plane, said cam means gravitationally rotating into gripping engagement with a sheet of material placed against said plane, and being rotated into tighter gripping engagement by gravitational forces exerted on the sheet of material as the frame members are lifted upwardly; the cam means including a pair of cams mounted opposite the lower frame arms and rotatable into engagement therewith, the cams being joined for tandem motion by a connecting rod.
Claim 3
Dependent Claim
151 words
A carrying device arranged to permit a workman to easily lift and transport large sheets of construction material such as plywood, wallboard and the like, comprising: frame means providing lifting regions and defining a plane against which a sheet of material may be placed; cam means pivotally supported by the frame means adjacent said plane, said cam means being mounted eccentrically for rotation into tighter gripping engagement with a sheet of material by gravitational forces exerted on the sheet of material as the frame is lifted upwardly; and said frame means including a lower frame member having frame arms defining said plane and a crossbar forming a lower lifting region, and an upper frame member joined to the lower frame member and having mounting arms for said cam means and a crossbar forming an upper lifting region, said upper and lower crossbars being offset from said plane on one side thereof.
Claim 4
Dependent Claim
151 words
A carrying device arranged to permit a workman to easily lift and transport large sheets of construction material such as plywood, wallboard and the like, comprising: frame means providing lifting regions and defining a plane against which a sheet of material may be placed; cam means pivotally supported by the frame means adjacent said plane, said cam means being mounted eccentrically for rotation into tighter gripping engagement with a sheet of material by gravitational forces exerted on the sheet of material as the frame is lifted upwardly; and said frame means including a lower frame member having frame arms defining said plane and a crossbar forming a lower lifting region, and an upper frame member joined to the lower frame member and having mounting arms for said cam means and a crossbar forming an upper lifting region, said upper and lower crossbars being offset from said plane on one side thereof.