Abrading – Frame or mount – Portable abrader
Reexamination Certificate
2000-01-26
2001-10-23
Hail, III, Joseph J. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S344000, C451S358000, C451S359000
Reexamination Certificate
active
06306023
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a grinding tool, especially for hand-held oscillating devices as used, for example, for fine grinding work such as the abrasive treatment of new automobile finishes.
2. Discussion of the Prior Art
It is known that with new finishes it is unfortunately not always possible to prevent contaminating particles from falling into the fresh paint or the occurrence of other forms of contamination and irregularities or finish runs.
To eliminate these finishing errors, a tool has previously been used which consists of a cylindrical plastic block of about 3 cm diameter, to whose underside flat abrasive paper is stuck by means of an adhesive strip. The treatment is then carried out manually and is extremely laborious and, very often, unsatisfactory in its results.
Grinding tools are admittedly known which are used together with hand-held oscillating devices (see, for example, German reference DE 94 10 754.8 A1 and the Fein company's brochure “Feinschleifer plus”8.96). These known grinding tools each have relatively rigid grinding disks, on the undersides of which abrasive sheets can be stuck. The overall treatment surface of the tool is consistently of equal hardness or rigidity, up to the outer edge, so that a particularly sensitive, soft, enhancing regrinding and polishing operation cannot be undertaken sufficiently optimally. In addition, these tools are rigidly arranged on the oscillating device in question and have a predetermined working surface orientation extending parallel to the oscillating device, as a result of which problems may arise in confined spaces.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a grinding tool of the generic type named above whereby very accurate and fine grinding work, especially the after-treatment of finishing errors, can be optimally undertaken.
According to the invention, the tool body of the grinding tool consists of a holder for fixing the tool to the oscillating device and a flange of relatively soft, flexible material fixed thereto, supporting the abrasive paper and designed or arranged with axial dimensional flexibility at its outer edge. This results in the advantage that, in particular, increased pressure via the tool edge on the grinding surface is avoided. Very soft and very fine work can thus be carried out, so that when grinding or polishing, for example, an unsatisfactory new finish the defects can be perfectly eliminated by the grinding tool according to the invention and, under these circumstances, the peripheral edge of the tool does not act rigidly on the finish, leaving traces behind.
The axial dimensional flexibility of the flange is achieved, according to the invention, in that the supporting surface of the flange on the holder is much smaller than the working surface of the flange. As a result, a projecting flange part exists which yields with corresponding elasticity and is bent softly downwards under axial compressive stress at the edges.
It is advantageous for the flange to consist of soft rubber or soft plastic, while the holder is produced from rigid plastic. In this case, the holder and the flange can, for example, be firmly adhesively bonded to one another. However, the possibility also exists of connecting flange and holder to one another releasably, for example via a touch-and-close arrangement or adhesive tape, which permits the advantage of rapid replacement potential in the event of failure of one of the two parts or the use of different flanges in conjunction with the same mounting, which can prove very cost-effective.
It is particularly advantageous if the holder is also designed as a joint, forming a bearing block, which supports the flange on one of its end faces and supports a pivot member (joint head) pivotably mounted in the block via a joint pivot pin on its other side, preferably in a corresponding axial recess, via which pivot member the tool is fixed to the oscillating device. The advantage of additional angular adjustment is thus-provided here, in other words the active surface of the tool bearing the abrasive paper is adjustable in angle or in its inclination relative to the oscillating device, so that optimum handling with an optimum working effect is possible even on restricted working surfaces of difficult access. Instead of a simple joint with a single pivot pin it is of course also possible to provide a two-pin joint whose two pivot pins stand perpendicularly relative to one another, so that the inclination of the active tool surface can be designed as desired, which is very advantageous with regard to handling and working result.
It is further advantageous if the holder is of essentially cylindrical design, at least on the flange side, and is arranged with its axis standing perpendicularly on the flange, and if it has markedly rounded edges on the side facing the flange. As a result, therefore, a high degree of axial dimensional flexibility can be achieved in the peripheral zone of the active surface by a flange which is designed as a cylindrical disk arranged concentrically with the holder, the holder and flange having essentially equal diameters. With somewhat heavier axial pressure on the edge or the outer edge section, this outer flange part will yield elastically axially, while its central part is firmly connected, for example bonded, to the holder. Depending on the size of the rounding, stepping or chamfering of the holder, the flexibility of the flange will also be different.
In a further embodiment, the flange may be designed in the form of a truncated pyramid with a cross-sectional tapering toward the holder. In this arrangement, the diameters of the end faces, facing one another or resting on one another, of the flange and holder are essentially the same, so that the holder sits flush on the small base surface of the conical flange. As a result, the flange projects outward in the manner of a skirt or widens toward the working surface from the holder. As a result, the flange is firmly supported axially only in respect of the part of the surface covered by the holder, the small base surface, while the (spacer) ring extending to the outer edge of the lower, large base surface has a high axial elasticity as a result of its cross-sectional tapering so that very precise, soft treatment is possible.
In a further, advantageous embodiment an essentially cylindrical support disk is arranged between holder and conical flange, its diameter being greater than the outer diameter of the holder and at the same time of equal size with the small base of the conical flange. As a result of the relatively large support disk, which may likewise be produced from the same material as the holder, in other words rigid plastic, the holder may first have any desired outer peripheral shape, in other words cylindrical, rectangular, square or polygonal. In addition, which is extremely advantageous, a polishing cover which is designed in the form of a pot-shaped hood, can be drawn over the rubber flange and the support disk, it being possible for this polishing cover to be a sheepskin. With only a few movements of the hands, therefore, a grinding disk can be converted into a polishing disk with extremely good properties by pulling on the sheepskin hood.
The design of the support disk with a large diameter also represents a relatively large grinding or working surface, which is of great advantage, especially, for the treatment of relatively large, flat surfaces. A flange with a cylindrical generated surface may, of course, also be used in the design with the support disk, provided that the support disk has a working surface of smaller diameter as a result of rounding, stepping or discontinuous edges or, very simply, as a result of the outer diameter of the disk being correspondingly smaller relative to the flange.
In this arrangement, either the support disk can be designed integrally with the holder or the support disk and holder can be two separately prepared parts which are fixedly connected to one another,
Cohen. Pontani. Lieberman & Pavane
Hail III Joseph J.
McDonald Shantese
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