Cutlery – Cutting tools – Scrapers
Reexamination Certificate
2002-07-12
2004-06-22
Payer, Hwei-Siu (Department: 3724)
Cutlery
Cutting tools
Scrapers
C015S236010
Reexamination Certificate
active
06751869
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a blade useful in a scraper or knife. More particularly, the present invention relates to a blade having a skirt spaced from the edge.
2. Description of the Related Art
The use of scrapers for removing paint, tile, wall paper, and similar coverings from a floor or wall is well known. A drawback in such scrapers is that material collects at the intersection of the scraper blade and the nose of the blade gripper. This reduces the effectiveness of the scraper and shortens the effective scraping stroke. Material may become lodged between the shank of the blade of the scraper and the gripper, causing undesired deformation of the gripper blade resulting in gouging of the surface being cleaned. The shorter strokes and added resistance to scraping as material builds up on the nose of the gripper, particularly in floor scrapers, results in less useful life of the scraper handle. Also, time is lost in removing material collected on the nose of the gripper and material jammed between the gripper and the shank of the scraper blade.
It would be desirable to provide a scraper blade which allows the removed material to travel over the nose of the blade gripper, thus avoiding the jamming of removed material between the gripper and the blade. It would, also, be desirable to provide such a scraper blade which is so configured as to be repeatedly sharpened without effecting the overall shape and function of the blade.
U.S. Pat. No. 5,924,204, issued Jul. 20, 1999, to Lane describes a scraper having a wedge-shaped blade to avoid material from building up or being jammed against the nose of the gripper and between the nose of the blade gripper and the blade. Removed material travels up over the wedge and continues over the gripper, thus avoiding buildups of material against the gripper nose. The present invention provides a flat portion between the beveled blade edge and the wedge-shaped skirt allowing the beveled blade to be sharpened repeatedly without changing the angle of the bevel or the height of the skirt. This would not be possible in the '204 blade without removing the blade and reducing the overall height of the wedge, thus exposing the gripper nose to material buildups.
U.S. Pat. No. 3,035,344, issued May 22, 1962, to E. G. Brown describes a knife with stripped inclined surfaces rising up from the sharp edge of the blade.
U.S. Pat. No. 6,237,225 B1, issued May 29, 2001, to Tarrant describes a floor scraper useful for removing vinyl tile or floor covering from floors.
U.S. Pat. No. 323,502, issued Aug. 4, 1885, to Edwards, describes a scraper having an inclined edge portion.
U.S. Pat. No. 2,268,393, issued Dec. 30, 1941, to Hanssen, describes a hand-held floor scraper.
None of the above inventions and patents, taken either singularly or in combination, is seen to describe the instant invention as claimed. Thus a skirted floor scraper blade solving the aforementioned problems is desired.
SUMMARY OF THE INVENTION
The present invention is a scraper blade for fitting into a gripper such as a mounting, holding, or clamping device of a scraper. The inventive scraper blade is particularly useful with a floor scraper. The inventive scraper blade has a beveled edge portion, a flat portion, a skirt portion extending outward from the flat portion, and a shank portion fitting into a gripper of a scraper apparatus. The skirt portion has a generally vertical rear side which preferably rests against the nose of the gripper. A flat shank portion extends rearward from the rear side of the skirt portion and serves as the gripping surface of the blade for the gripper of the scraper apparatus.
Material dislodged by the edge of the blade travels over the beveled edge portion, then over the flat portion, and then is directed upward over the skirt portion and then over the nose of the gripper. This avoids the accumulating and jamming of dislodged material between the scraper and the gripper, allowing longer strokes when cutting or scraping, less wear and tear on the gripping apparatus, a longer lasting blade due to its inherent heavy duty construction, and the avoidance of bending or warping the blade gripping device which results in the blade falling out of the gripper during the scraping operation.
Accordingly, it is a principal object of the invention to provide a blade for a scraper which prevents the accumulation of removed material between the scraper blade and the gripper of a scraper apparatus.
It is another object of the invention to provide a blade as above which directs removed material over the nose of the gripper of the scraper apparatus.
It is a further object of the invention to provide a blade as above which may be repeatedly sharpened without changing the angle of the scraper cutting edge.
Still another object of the invention is to provide a blade as above which is useful as a knife blade for a variety of purposes where the blade is mounted in a mounting device to direct material or debris to flow over the mounting, holding, or clamping device.
It is an object of the invention to provide improved elements and arrangements thereof for the purposes described which is inexpensive, dependable and fully effective in accomplishing its intended purposes.
These and other objects of the present invention will become readily apparent upon further review of the following specification and drawings.
REFERENCES:
patent: 323502 (1885-08-01), Edwards
patent: 358234 (1887-02-01), Vache
patent: 1529683 (1925-03-01), Anderson
patent: 1898690 (1933-02-01), Schacht
patent: 1927202 (1933-09-01), Burdick
patent: 2268393 (1941-12-01), Hanssen
patent: 3035344 (1962-05-01), Brown
patent: 4089562 (1978-05-01), Baumeister
patent: D366130 (1996-01-01), Ordonez
patent: 5924204 (1999-07-01), Lane
patent: 6237225 (2001-05-01), Tarrant
patent: 6519801 (2003-02-01), Chao
Litman Richard C.
Payer Hwei-Siu
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