Abrading – Tool support for flexible-member tool
Reexamination Certificate
1999-02-03
2001-01-23
Butler, Rodney A. (Department: 3725)
Abrading
Tool support for flexible-member tool
C451S359000
Reexamination Certificate
active
06176771
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a grinding disk for an electric hand power tool.
Grinding disks of the above mentioned general type are known in the art. In a known grinding disk of this type the supporting plate is formed as a stamped, black-lacquered steel plate and the burdock-type fabric as a cover sheet is formed on the foam material body of a flexible polyurethane. For obtaining a sufficient adhesive strength between the supporting plate of steel and the flexible polyurethane foam, an adhesive agent is spread on the supporting plate.
In another known grinding disk of this type, the supporting plate is composed of glass-fiber-reinforced polyamide, and the burdock-type fabric is also formed as a cover sheet on the foam body of polyurethane. For securing the adhesive strength of the foam material body on the supporting plate, the outer surface of the polyamide supporting plate is treated with reactive gas in a low pressure plasma process.
SUMMARY OF THE INVENTION
Accordingly, it is an object of present invention to provide a grinding disk for an electric hand power tool, which is a further improvement of the existing disks.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated, in a grinding disk in which the supporting plate is composed of massive, non-foamed viscous hard polyurethane resin, and the foam material body is composed of a polyurethane reaction mixture which connects the supporting plate and the burdock-type fabric.
When the grinding disk is designed in accordance with the present invention, it has the advantage that the supporting plate composed of viscous hard, massive, non-foamed polyurethane resin is connected with the flexible polyurethane foam applied in a second working step, due to the chemical reactive groups located on the outer surface.
When compared with known grinding disks, it is not necessary during the manufacture to use the method steps of the steel treatment or the injection molding of thermoplastic material, so that due to saving of the punching and injection molding tools for the supporting plate, tool costs are reduced. Also, the utilization of health-hazardous and environmentally damaging adhesive agents is dispensed with, as well as the treatment of the support plate which is injection-molded from polyamide in a low pressure plasma.
Moreover, the recycling possibilities of the inventive grinding disk, for example by chemical glycolysis, is substantially simpler than for the known grinding disks.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 4671020 (1987-06-01), Hutcins
patent: 4839995 (1989-06-01), Hutchins
patent: 5383309 (1995-01-01), Sampietro
patent: 5807161 (1998-06-01), Manor et al.
Butler Rodney A.
Robert & Bosch GmbH
Striker Michael J.
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