Cutlery – Combined cutlery or combined with ancillary feature – With material-holder or disposal
Reexamination Certificate
1999-06-09
2001-07-03
Payer, Hwei-Siu (Department: 3724)
Cutlery
Combined cutlery or combined with ancillary feature
With material-holder or disposal
C030S169000, C030S339000, C015S236080, CD32S049000
Reexamination Certificate
active
06253454
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a tool used in patching damaged surfaces or removing a surface layer to a certain depth and method of repairing surface damage or installing wall panels employing this tool. This tool is especially designed to repair cracks, holes and breaks associated with damaged surfaces or install new dry wall surfaces.
BACKGROUND OF THE INVENTION
Walls are frequently damaged. It is common for buildings to settle over the course of time resulting in cracks. Old plaster may loosen and crack and start to fall off the wall or ceiling. Also, during even ordinary use, walls become damaged. Dents are formed by door knobs banged into walls, furniture which impacts walls, and children at play. In many cases, the damaged area can be repaired instead of replacing the wall.
For very small repairs, iron on patches have been used in which a polymer fabric is cut to size and ironed with a household iron set at medium heat. Compound is applied over the fabric and sanded when the compound has dried.
If the repair area is sizable, patching tape is used to help hold in the plaster. In repairing the damaged area, loose plaster or dry wall is removed, often with a screwdriver or putty knife. Slightly bending the corners of the screwdriver or knife against the wall cleans out a trough. Sandpapering may be done to provide a rough surface which adheres plaster well.
When a crack or damaged area is large, the wet plaster will not stick. The trough is fit with a mesh or perforated tape which is cut and placed into the trough. Plaster is laid over the mesh. Crisscross motions with a putty knife help to level off the plaster. Any excess plaster is squeezed out so there will not be a lump in the wall. If the patch shrinks too much as it dries, a second coat is applied. Very light sanding with 200+ to 400+ sandpaper or wiping with a dampened sponge the repaired area helps to blend in the repair with its surroundings. If the appearance of the repair is unsatisfactory, it may be brushed down with sandpaper until all edges are broken down.
The prior art repair techniques are deficient in that usually a bulge of plaster extends out from the site of the repair. Also, the prior art techniques require a large amount of scraping with a single blade. The prior art repair techniques do not remove a layer to a precise predetermined depth. When cracks are repaired by simply covering the cracks with dry wall compound, they have a tendency to reappear. Adding tape over the crack helps some, but doesn't eliminate the problem in that bulges will be visible.
Also, in putting up drywall, beveled edge panels are unavailable. It becomes necessary to join a non-beveled edge panel to another panel. Adding plaster to such a juncture results in bulging.
It would be useful to patch, join, repair and replace sections of a wall by a simple process in which the repair would blend imperceptibly with the undamaged remainder of the wall surface. A tool which would facilitate such a process would be welcome.
SUMMARY OF THE INVENTION
The present invention relates to a simple tool which permits removing a thin surface layer of plaster or dry wall to perform a patch.
The present invention relates to an apparatus for forming a trough in plaster, comprising a plurality of groove forming projections extending from a groove facet by a given distance, and within a fixed width, a scraper blade extending from the housing, the blade having a width less than the fixed width. The present invention also seeks to prevent from removing too deep a layer of wall material. The present invention also provides a mechanism for adjusting the scraper blade depth to project smaller distances.
The tool itself has a plurality of blades set into one face of the tool, and a scraper attached to the opposite face. The area of the dry wall surrounding the crack is scored with the blades. The tool is then reversed and the plaster material is removed with the scraper portion. The blades are held in place with a transverse screw that passes through holes in the blades, together with a plate that is clamped over the surface of the blades. Individual blades can be removed and replaced as necessary.
The present invention relates to a tool which forms grooves in a surface and also controls the depth to which a top layer is removed from the original surface.
The present invention relates to a tool which is easy to use and precise. It optionally has an adjustable depth gouging blade to vary the depth of the top layer of a surface to be repair.
The present invention relates to a method for repairing a surface in which generally parallel cuts are simultaneously made in the surface in one direction, other generally parallel cuts are made in a generally perpendicular direction, gouging to a predetermined depth is performed to remove a top layer to form a recessed area, an initial coating of plaster is placed within the recessed area, mesh or netting is then placed onto the initial coating of plaster in the recessed area and a final coating of plaster is spread over the mesh or netting so as to match the surrounding surface.
Although the present tool is especially meant to be used to repair or install dry wall, it also is able to repair plaster/lathe and stucco.
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Harter Secrest & Emery LLP
Payer Hwei-Siu
Salai Esq. Stephen B.
Shaw Esq. Brian B.
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