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US 5,997,221 AGranted
Channel rasp
OwnerKermit J. Sadlerinventor
Life of this patent
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OwnerKermit J. Sadlerinventor
Estimating the term…
A rasp is formed for removing material at a cut edge of a structure, such as drywall cut to size. Unlike prior drywall rasps, the rasp of the invention is formed with a rigid, channel-shaped grip defining a generally U-shaped, downwardly facing, concave inner channel surface. A rectangular section of expanded metal that forms a grid with a multiplicity of grid openings delineated from each other by a lattice of intervening metal strips is placed into the channel-shaped backing or grip. Lips at the lower extremities of the channel walls are bent upwardly and inwardly to clamp the sheet of expanded metal against the inner surface of the grip. The sheet of expanded metal is thereby permanently secured against the inner surface of the grip. The sheet of expanded metal is bent to conform to the interior surface of the grip. The channel-shaped structure of the rasp is then run along the cut surface of a structure to be finished so as to abrade away material therefrom. Because the rasping element is disposed against the concave, channel-shaped, inner surface of the grip, there is a minimal likelihood of accidental contact between the expanded metal abrading element and anything other than a narrow edge of sheet material purposely inserted into the channel-shaped structure of the rasp. The rasp thereby greatly reduces the likelihood of accidental injury to the user.
A rasp formed by a stiff sheet of backing material fashioned into a longitudinally extending channel-shaped grip having a backing material web that extends transversely between a pair of mutually parallel channel walls thereby defining a concave inner channel surface, and wherein said mutually parallel channel walls are each provided with a lip remote from said backing material web and extending the length of said backing material, and an abrading element comprised of a sheet of expanded metal inelastically deformed to define a pattern of a multiplicity of grid openings that are delineated from each other by strips of metal interconnected together to form a lattice with said grid openings therebetween, and said abrading element has a pair of mutually parallel, longitudinally extending side margins that contact and are parallel to said channel walls and which reside adjacent to said lips of said backing material, and said abrading element conforms to and contacts said concave inner surface of said channel throughout, and said lips are bent inelastically inwardly toward said backing material web to capture and grip said side margins of said sheet of expanded metal, thereby firmly securing it to said backing material.
A rasp for removing material at a cut edge of a structure comprising:
Dependencies are inferred from the claim text.