LT5032B - A cylindrical grinding and polishing device for manual grinding machine - Google Patents

Abstract

The invention relates to woodworking industry and can be used for grinding and polishing of wooden, metallic, plastic and rubber surfaces. A cylindrical grinding and polishing device for manual grinding machine comprises a hollow cylinder, in an axis of which is fixed a smaller cylinder, in axis of which is fixed an another smaller cylinder, for disposing a metal pivot which is connected to manual part of grinding machine and exterior surface of a hollow cylinder is coated by porous rubber on which is disposed abrasive mwan.

Description

The machine is intended for sanding and polishing a wide variety of wooden, metal, plastic, rubber surfaces, to remove varnish and paint from those surfaces. Can be used in the woodworking industry (furniture manufacturing, various logging), in car repairs, repairs and so on.

Grinding discs are known in the art when the flexible support plate is directly coated with an abrasive plastic layer (DE 3416186 Al).

Disc sanders, which are currently used with hand sanders, scratch the sandable surfaces compared to the present invention, which is less comfortable in operation (it is impossible to sand or remove paints, varnishes from more sophisticated profiles, works less efficiently).

Disadvantages of current disc grinders:

1. Scratch abrasive surfaces;

2. It is not possible to sand more complicated profiles (window frames, figurative surfaces, etc.);

3. Less productive in operation - the rubber surface on which the paper is flexed, bounces, so the quality and speed of the scrubbing, polishing and dropping is significantly different to the detriment of the latter.

.Building cylindrical grinders recently launched by the industry are fundamentally different from the one described here - sandpaper is glued to the axis so it is not replaced, and the machine becomes discarded when worn. These sanding machines with axis-based abrasive paper have the following disadvantages:

1. There is a single use;

2. Small in size, therefore used for more precise work;

3. Too expensive for the buyer, because the scrubbing material is discarded;

4. It is difficult to achieve a smooth sanding surface.

All these disadvantages are avoided by the use of the provided cylindrical grinding and polishing unit for manual grinding machines.

The device consists of a hollow cylinder with an inner geometric axis for securing another smaller cylinder. The inner part of the hollow cylinder is provided with longitudinal partitions perpendicular to the surface of the small cylinder to connect the small cylinder to the inner walls of the hollow cylinder and also to ensure the rigidity of the hollow cylinder. One side of these partitions rests on the inner surface of the cylinder and the other on a small diameter cylinder located on the inner axis of the large cylinder. This small cylinder is designed to attach to a metal rod that connects the machine to the rotating part of the manual sander. The metal rod is pressed into plastic or fixed in longitudinal grooves.

In the center of the large cylinder is a transverse partition perpendicular to the axis of the cylinder which divides the inner space of the cylinder into two parts. It is designed to reinforce the cylinder structure.

Both cylinders and partitions can be made of different materials: metal, plastic, wood, rubber. In the example shown, the entire structure is made of plastic. Porous rubber is glued to the exterior surface of the drum to ensure that sandpaper fits snugly against the machine and sanded surfaces to prevent vibration during operation. Porous rubber does not cover the entire surface of the cylinder - a 15 to 25 mm groove is left along the cylinder between the two ends of the porous rubber, which then adheres to the sandpaper. A sandpaper is applied over the entire width of the cylinder to the porous rubber-coated surface. The thickness of the material glued to the groove and the thickness of the ends of the sandpaper attached are all so thick that they fill the groove to a smooth cylinder surface with abrasive material. There are several ways to apply sandpaper:

1. In the groove left between the porous rubber, an adhesive tape is glued on the surface of the plastic cylinder, with both sides adhering. Sandpaper is attached to this tape. When changing paper, scrape the strip off the surface of the drum, apply a new strip of abrasive paper, and attach it to it.

2. In the groove left between the porous rubber, a material known as Scotchmate 'shall be glued on the surface of the plastic cylinder.' This material consists of two different layers. One layer, which is glued to the plastic cylinder, is characterized by the fact that its surface is completely covered with so-called "loops". The next layer, which is glued to the scrubbing paper, has fibers. When these materials are compressed, they adhere to each other. When you pull it stronger, you relax. This method of attachment allows the sandpaper to be attached to the cylinder many times.

3. In the groove left between the porous rubber, a material with the international name "DualLock" is glued on the surface of the plastic cylinder. This material consists of two identical layers. One layer of this material is fixed to the barrel, the other, divided into two equal parts, is glued.

A cross-sectional view of the device is shown in the drawing. The drawing shows a hollow plastic cylinder 1, an inner small cylinder 2, inner longitudinal partitions 3, a porous rubber layer 4, a longitudinal groove for fixing the abrasive paper edges 5, a metal rod for attaching the machine to a sanding machine 6, material for sanding paper edges 7.

The device described here can smooth or polish any surface smoothly, is inexpensive and easy to use. The machine allows for even sanding of flat surfaces as well as various cuts, grooves, etc.

Compared to disk hand sanders, the proposed machine does not scrub and polish surfaces, and is much more efficient, productive and has a wider range of applications.

Definition of the Invention

Claims (6)

Definition of the Invention 1. A cylindrical grinding and polishing machine for hand sanding machines having an abrasive device mounted on a pivoting part of the machine, characterized in that the pivoting part of the device consists of a hollow cylinder having another smaller cylinder mounted on its axis for insertion of a metal rod connecting the device to a rotating hand machine part, and the outer surface of the hollow cylinder is covered with a layer of porous rubber on which abrasive material is applied. 2. A cylindrical grinding and polishing device for a hand-grinding machine according to claim 1, characterized in that the inner space of the cylinder is provided with longitudinal partitions perpendicular to the surface of the smaller cylinder for connecting the smaller cylinder to the inner walls of the large cylinder. 3. A cylindrical grinding and polishing device for a hand sanding machine according to claim 1, characterized in that the hollow cylinder has a transverse partition dividing the inner space of the cylinder into two parts. 4. A cylindrical grinding and polishing machine for hand sanding machines according to claim 1, characterized in that the abrasive is sandpaper. 5. A cylindrical grinding and polishing machine for hand sanding machines according to claims 1 and 2, characterized in that not all of the outer surface of the cylinder is covered with rubber, but a gap is provided along the cylinder, which adheres to the ends of the abrasive. 6. A cylindrical grinding and polishing machine for hand sanding machines according to claim 1, characterized in that the ends of the scrubbing paper are joined together by a specially created gap, not covered by porous rubber, by any method of attachment thereof, such as adhesive tape, adhesive tape, and the like. moreover, the gap is filled with said abrasive ends and fastening material to an even surface of the outer cylinder.