DE2343722A1 - Hand grinding tool with a grinding block - block is of elastically deformable material and grinding grains are stuck to block faces - Google Patents

Abstract

Hand grinding tool with a block or plate, on at least one of whose surfaces are grinding grains where the block or plate is of elastically deformable matl., esp. from interconnected part pieces of a cellular matl. such as an aerated plastic. The grinding grains are fixed to one or more faces of the block or plate by means of a deformable adhesive. Specif., the block matl. can be polyurethane and the adhesive contains rubber matl. The block is of rectangular box section, with typical dimensions of 11 X 7 X 3.5 cm., of a matl. with density in the range 10-12 lb./cu.ft. whilst the abrasive matl. can be an aluminium oxide.

Description

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Dipi.-lng. Waiter Jackish

Stuttgart N. Menzelstrasse 4Q _oo . _{o n} _

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Thomas Harold Noel Brogden

83 Thornton Avenue A 33 834 - mü

Maoolesfield / Cheshire, August 29, 1973

England

"Grinder"

The invention relates to a grinder with a block or a plate on whose at least one surface abrasive grains are provided.

In order to be able to sand materials such as wood, metal, plastic or any kind of coating by hand, it is known to use a block of wood to remove the emery board, Glass paper or the like. Is beaten. The relentless support of the abrasive material creates the disadvantage that uneven surfaces cannot be sanded evenly and the sanding ability of the Abrasive material before its actual wear and tear is reduced by sanding dust deposited between the sanding grains, which affects the sanding surfaces of the Makes abrasive grain ineffective. Furthermore, it is difficult securely attach the abrasive material to the block in a simple, convenient and inexpensive manner.

To eliminate these disadvantages, a grinding device of the type indicated at the beginning

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by means of that the block or the plate consists essentially of one elastically deformable material, in particular composed of interconnected fragments of a foam Or the like. Is produced, and that the abrasive grains by means of a flexible adhesive to one or more Sides of the block or plate are attached.

Due to the deformability of the grinding surface of the invention Grinding device can achieve an at least largely uniform sanding on an uneven surface which is not possible with a device with glass paper or emery cloth on a fixed holding block is. Since the sanding surface is deformable, there can still be excessive build-up of sanding dust on the sanding surface Surface can be avoided, as the sanding dust is automatically removed from the sanding surface during use and / or can be easily removed if necessary, for example by bending the surface.

Furthermore, since the block or plate is an integral part of the device, the problem is a safe one Fixing of the grinding surface during use avoided on the block or on the plate. If the grinding properties of the device according to the invention in particular are significantly reduced by wear and tear, then the entire device can be thrown away and replaced with a new one because the device can be made of cheap material and, moreover, possibly higher manufacturing costs of the device according to the invention compared to conventional glass paper or emery cloth, at least to a certain extent be compensated for by an increased service life,

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because a particularly local excessive clogging of the space between the abrasive grains by grinding dust in the is avoided in the manner explained above.

The elastically deformable material for the block is preferred obtained from parts or fragments of an elastic foam such as polyurethane, the fragments be connected to each other by a flexible solid. Such elastically deformable ones in question Materials are described in British Patents 869,624; 898,712; 939,868 and 3,029,961 explained in more detail, to the respect Details of the manufacture, the starting materials and the properties of these materials are referred to can.

The material of the block or the plate is particularly advantageously deformable, but on the other hand sufficient so that additional support measures can be avoided and one that is sufficient and essentially for the cut Even pressure can be transferred from the grinding surface to the workpiece surface without the block or plate deforms significantly. Preferably the material for the block or the plate is also used chosen so that in the manufacture of the device according to the invention a substantially smooth and continuous Surface is created.

A particularly suitable material for the block or the Slab is obtained by reusing chips made of foamed polyether or polyester, such as des under the trade name "Dunlopreme DR65" (registered

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Trademark) or "Kayfoam KC lö ⁿ (registered trademark) of a known substance with a density in the range of 20-24 g / cdm (10-12 lb / cu.ft.).

The block or the plate can be given any desired shape, for example rectangular, triangular or be made circular and thereby obtain a suitable size. In a preferred embodiment of the Invention, the grinding device according to the invention has a rectangular block of approximately 11 × 7 × 3.5 cm edge length and all surfaces of the block have associated abrasive grains, with the exception of the two smallest surfaces, the are kept free of abrasive grains and may have any type of imprint, such as advertising and / or information and / or colorations or patterns in aesthetically pleasing catfish. The log can be used in detail for relief the handling can be molded. If necessary, the block or the plate can be different on different surfaces Contain granular abrasives, for example the rectangular block explained in more detail above, which is attached to a Rough grinding material (e.g. gradejJö aluminum oxide) on the side surface and one end surface and on the other side surface and end face finer abrasive material of a middle one Roughness (e.g. grade60 aluminum oxide) may have.

In principle, the abrasive grains can be the same as those used in conventional abrasives, such as ground, Glass made from bottles, garnet or carborundum, the type and size of the abrasive grains in the usual Catfish is chosen taking into account the intended use.

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The adhesive can in principle be chosen freely, whereby it should be noted that it should preferably have a flexibility which is at least the flexibility of the block or corresponds to the plate. Preferably, an adhesive based on the usual natural or synthetic Rubber materials selected, such as Evostiek 528 or Bostik Clear Adhesive.

It is obvious that a grinding device according to the invention can be used, in particular, as a hand-held grinding device for the household or the like. However, the invention is not is limited to such a use and a grinding device according to the invention can also be used in other ways can, for example, in motor-driven grinding machines. For example, the device can hold a plate (e.g. a circular or rectangular plate of about 5 - 10 now Thickness) that have abrasive grains on one surface and in the area of their opposite surface Means for attachment to a rotary grinder or the like. Has. Such fastening means can, for example be formed by a contact adhesive layer, which is covered by a removable protective film.

An embodiment of the invention is shown in the accompanying drawing. The support body according to this embodiment it consists of a block 1, which has a length of approx. 10 cm, a width of approx. 5 cm and a height of about 3 cm. On the two side surfaces 2 and the two longitudinal end faces 3 (of which only one is visible) the block is provided with abrasive grains, wherein the abrasive grains have different grain sizes

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can and thus the grinding surfaceei different roughness own. The two smallest end faces 4 (from only the front one is visible) are free of abrasive grains and can be printed decoratively or informatively. In the example, the end faces 4 are not reworked, so that dividing lines 5 between adjacent Chips 6 of a foam that is used to form the block 1 are visible. To a level

and to get an uninterrupted surface, they are foamy

Pulp 6 in a mold to form the block 1 pressed, after which the block 1 on its surfaces 2 and 3 with a flexible adhesive after curing and the abrasive grains. Because of the compliance too of the pressed Schaurastoffschnitzel 6, the surfaces of the block can adapt to uneven grinding surfaces, so that the deformation of the respective sanding surface of the Kietz results in an even sanding.

⁺ with the addition of a flexible solid adhesive

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Claims (4)

Thomas Harold Noel Brogden Thornton Avenue A 33 8j54 - mü Macclesfield / Cheshire, August 29, 1972 England Ans ρ- odor / 1.] Grinding device rait a block or a plate, on whose at least one surface abrasive grains are provided, characterized in that the block (1) or the plate made of elastically deformable material, in particular of interconnected parts or fragments (6) of a cellular material such as foam or the like. Is made, and that the abrasive grains are attached to one or more surfaces (2, J>) of the block (1) or the plate by means of a deformable adhesive. 2. Grinding device according to claim 1, characterized in that the elastically deformable material consists of fragments (6) an elastically deformable cell material such as polyurethane, wherein the fragments (6) are connected to each other by a deformable pesticide. 3. Grinding device according to claim 1 or 2, characterized in that that the adhesive contains rubber material. 509811/0126 " ² " 2 3 A 3 7 2 2 4. Grinding device according to one of claims 1 to 5, characterized characterized in that the block (1) on its different surfaces (2, j5) abrasive grains of different Has grain. 50981 1/0126