Abrading – Tool support for flexible-member tool
Reexamination Certificate
2001-07-03
2002-08-13
Rachuba, M. (Department: 3723)
Abrading
Tool support for flexible-member tool
C451S538000, C451S539000, C451S548000
Reexamination Certificate
active
06431970
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a sanding pad with a circular cross section for a manually operable grinding device with means for holding the grinding device at one surface and with a contacting surface on the opposite surface for guiding an abrasive, which is connected detachably with the contacting surface by means of a connecting medium.
Sanding pads of the above-mentioned type are used as holding and guiding means for the abrasive used. The abrasive may consist, for example, of a sheet-like backing, which is coated with abrasive material. A bonding medium, applied at the sanding pad, combines the abrasive used with the sanding pad. By means of a driving device, the sanding pad is set in motion and transfers this motion to the abrasive. As a result of the movement, the abrasive material, aligned against the surface to be worked, abrade a portion of the surface to be worked. The movement, for example, is rotary.
A sanding pad of the aforementioned type is known, for example, from the EP-0745019. It has a circular cross section and is provided at one surface with means for accommodating the grinding device. On the opposite surface, the known sanding pad has a contacting surface for guiding an abrasive, the abrasive being bound to the contacting surface detachably by a bonding medium.
The low abrading performance is a disadvantage of the known solution. In order to obtain a higher abrading performance, the known sanding pad, for example, can be acted upon with a higher rotational speed or a higher contacting pressure. As a result of this reaction, however, the wear of the abrasive used is greatly accelerated, and this has a negative effect on the service life of the abrasive used.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a sanding pad for a manually operable grinder, which has a higher abrading performance without at the same time shortening the service life of the abrasive used.
Pursuant to the invention, this objective is accomplished owing to the fact that the sanding pad has radially extending grooves, which are arranged open towards the contacting surface, so that a plurality of radially extending edges are formed on the contacting surface. As a result, there is a high local increase in the surface pressure in the region of the edges, which leads to an increase in the abrasive performance. However, since the surface pressure is increased only locally, a shortening of the service life is avoided.
Advantageously, the grooves extend in a straight or rectilinear line, in order to achieve as uniform an abrasive performance as possible and a uniform distribution of the abraded material.
Furthermore, adjacent grooves are preferably disposed at an angle of 10° to 60° to one another, in order to utilize the contacting surface well. In addition, excessive heating of the abrasive used is avoided by the distance between adjacent grooves and especially of adjacent edges.
Preferably, adjacent grooves are disposed at an angle of 15° to one another, so that the available contacting surface is used optimally and the abrasive used is not overheated.
Perpendicularly to the contacting surface, advantageously the grooves have a depth corresponding to 0.005 to 0.07 times the diameter of the contacting surface of the sanding pad. If the grooves are too deep, a disadvantageous weakening of the stability of the sanding pad will result. Grooves with an inadequate depth have a negative effect on the abrading performance of the sanding pad.
Advisably, the grooves have a radial distance inwardly from the outer periphery of the contacting surface, in order to maintain the stability of the cross members, formed by the grooves.
Preferably, the distance from the outer periphery corresponds to 0.01 to 0.05 times the diameter of the contacting surface the sanding pad. The smaller the distance that is selected, the greater is the abrasion performance of the sanding pad; at the same time, however, the stability decreases.
Advantageously, the length of the grooves corresponds to 0.1 to 0.4 times the diameter of the contacting surface grinding pad, to make sufficient space available for access to a locking device for the accommodating means.
At least the radially extending walls of the grooves extend obliquely with formation of a width increasing toward the contacting surface. Advisably, the walls of the grooves diverge in alignment towards the contacting surface. At least the radially extending wall, trailing in the direction of rotation, has this distinguishing feature, in order to achieve a maximum stability of the edges. The opposite edge does not need to have this distinguishing feature, since the load on this edge is significantly less.
In order to permit the grinding medium to be installed and dismantled easily, the connecting means are advantageously formed as Velcro strip fasteners.
Moreover, the sanding pad has a reinforcement extending over its periphery, especially a ring of a material stronger than that of the sanding pad in the remaining area of the contacting surface. By these means, the dimensional stability of the sanding pad is increased, especially in the peripheral area.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by it use, references should be had to the drawings and description matter in which there are illustrated and described preferred embodiments of the invention.
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patent: 6059644 (2000-05-01), Manor et al.
patent: 6261958 (2001-07-01), Crevasse et al.
Hilti Aktiengesellschaft
Rachuba M.
Sidley Austin Brown & Wood LLP
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