Abrading – Frame or mount – Portable abrader
Reexamination Certificate
2000-05-25
2001-09-11
Rose, Robert A. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S548000, C125S025000
Reexamination Certificate
active
06287181
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to the finishing of stone, and is more particularly concerned with a polishing head that can be used for all stages of the polishing procedure, and for all kinds of stone. The usual stone polishing arrangement comprises a flat plate equipped with specialized restraining device that receive abrasive bricks. Such an arrangement is known as a Frankfurt plate and can successfully polish marble, sandstone and limestone.
To polish granite, specialized heads have been required, the head being quite complex. Such specialized heads are shown in the U.S. Pat. No. 4,965,965 to Wallin et al. and U.S. Pat. No. 5,151,331 to Zambon. In both these devices, it will be noted that the abrasives are carried by pivoted arms that rock. As a result, the abrasive wears to a rounded surface and makes only line contact with the stone being polished.
In general, granite is not homogenous but is made up of hard quartz crystals cemented together by a softer surrounding matrix. Known devices embody resiliently mounted abrasive plates which tend to tilt thereby causing the cutting element to touch the stone surface at the leading and trailing edges. This results in unwanted distortion of the surface of the stone. For instance, U.S. Pat. No. 2,717,478 to Blum and U.S. Pat. No. 2,860,496 to Tocci-Guilbert include grinding elements which could tilt and dig into the stone's surface.
SUMMARY OF THE INVENTION
The present invention provides a stone polishing head that has a heavy barrel attachable to a conventional automatic polishing machine. The barrel approximates the weight of the head the polishing machine is intended to carry. The lower end of the polishing head mounts a drive plate, the drive plate in turn mounting an abrasive carrier having a plurality of abrasive segments thereon. The polishing head of the present invention holds the abrasive plate substantially flat during use for maximum effectiveness of the abrasive segments. This is accomplished by at least two parallel plates interconnected by connecting pins with resilient material interposed between the plates.
REFERENCES:
patent: 1698970 (1929-01-01), Shaff
patent: 1980491 (1934-11-01), Mall
patent: 1984205 (1934-12-01), Vinella
patent: 2629990 (1953-03-01), Tocci-Guilbert
patent: 2633008 (1953-03-01), Tocci-Guilbert
patent: 2716312 (1955-08-01), Speicher
patent: 2717478 (1955-09-01), Blum
patent: 2767527 (1956-10-01), Tocci-Guilbert
patent: 2860496 (1958-11-01), Tocci-guilbert
patent: 2882652 (1959-04-01), Owen
patent: 2883805 (1959-04-01), Limbers
patent: 3041793 (1962-07-01), Shimizu
patent: 3934377 (1976-01-01), Tertinek
patent: 5184429 (1993-02-01), Parsons
patent: 2 172 823 A (1986-10-01), None
Brown Michael D.
deKok Peter T.
GranQuartz, L.P.
Rodgers & Rodgers
Rose Robert A.
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