Cutlery – Cutting tools – Scrapers
Patent
1995-04-17
1997-06-24
Payer, Hwei-Siu
Cutlery
Cutting tools
Scrapers
30342, 76119, B26B 300
Patent
active
056407726
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to cutting tools adapted to cut the bond between laminated materials, such as between moldings and emblems on vehicle body panels, and methods for making such cutting tools.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,219,378 describes a cutting tool comprising a blade of thin resiliently flexible clock spring steel having a first sharpened edge, and an adapter including a blade holding portion engaging a portion of blade along a driven edge opposite its sharpened edge and an elongate shank portion projecting centrally from the blade holding portion that includes a portion shaped for engagement by an air hammer. The cutting tool is adapted to be reciprocated by the air hammer while the air hammer is manually manipulated to cut the bond between moldings and emblems on vehicle body panels, which cutting can be facilitated by the use of a lubricant in the form of the liquid sold by Minnesota Mining and Manufacturing Company, St. Paul, Minn., under the trade designation "Overspray Masking Liquid". While the cutting tool described in U.S. Pat. No. 5,219,378 is reasonably effective for that purpose, its blade holder portion is of two part metal construction which makes it expensive to manufacture and gives it a significantly high mass and specific gravity.
DISCLOSURE OF THE INVENTION
The present invention provides a cutting tool adapted to be reciprocated by a manually manipulated air hammer or similar device while being used to separate laminated materials, which cutting tool is inexpensive to make and has a relatively low mass and specific gravity compared to the cutting tool described in U.S. Pat. No. 5,219,378, while being surprisingly durable and effective when used to separate laminated materials such as to separate moldings or emblems from vehicle body panels, or to separate gaskets and/or adhesive from gasket surfaces, or to separate tiles from floors or walls.
According to the present invention there is provided a cutting tool comprising a blade of thin resiliently flexible metal (e.g., 0.012 inch thick blue tempered clock spring steel) having a first sharpened edge and an opposite driven edge, and an adapter that comprises (1) a blade holder portion attached around a portion of the blade adjacent its driven edge, which blade holder portion includes a rear part abutting the driven edge and front parts extending from the rear part along portions of the major surfaces of the blade toward the sharpened edge; (2) means for retaining that portion of the blade in the blade holder portion; and (3) an elongate shank portion having a rear end, a portion adjacent the rear end shaped for engagement by the air hammer or similar device, a front end which is attached to the blade holder portion with an axis of the shank portion generally in the same plane as the imaginary centerline of the blade and with the shank portion extending generally away from the sharpened edge from its front end toward its rear end. A sufficient portion of the adapter can be formed of polymeric material (e.g., high impact ABS) to provide an average specific gravity for the adapter that is significantly less than the specific gravity of metal (i.e., less than a specific gravity of about 1.84 which is the specific gravity of magnesium). This provides a durable cutting tool that is relatively light or low in mass per inch of width of the cutting blade along its driven edge, and which is inexpensive to make compared to the cutting tool described in U.S. Pat. No. 5,219,378, while, surprisingly, being more effective in quickly cutting the bond between moldings and emblems on vehicle body panels when used in the method described in that patent. Also, because the portions of the adapter that will contact the vehicle body panels using the tool according to the present invention are of polymeric material, the tool has less tendency to mark the paint on the surface of those panels while it is being used to remove the moldings and emblems than does the cutting tool described in U.S. Pat. No. 5
REFERENCES:
patent: 833869 (1906-10-01), Bowen
patent: 2264374 (1941-12-01), Henschell
patent: 2335872 (1943-12-01), Mitchell
patent: 3782482 (1974-01-01), Miller
patent: 5219378 (1993-06-01), Arnold
patent: 5469623 (1995-11-01), Roeker et al.
Crosby Shawn P.
Manor Edward L.
Roeker David C.
Griswold Gary L.
Huebsch William L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Payer Hwei-Siu
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