FR2622136A1 - Device for polishing plane or curved surfaces - Google Patents

Abstract

It consists of a roll 1 coated with a layer of polyether synthetic foam 3 of high density and high resilience, a second layer 4 of synthetic foam of low density and high resilience is placed over the first, an adhesive abrasive paper 6 is adhesively bonded onto the plasticised cylindrical outer surface 5 of the final layer of synthetic foam. The superposition of the two foam layers and their density difference and the driving of the roll in rotation using a simple power drill permit fast and risk-free work. The device according to the invention is particularly intended for the polishing of motor vehicle bodywork and boats' hulls before a paint is applied.

Description

 The present invention relates to a device for sanding flat or curved surfaces before applying a paint.

 The sanding of these surfaces is traditionally carried out either by a machine, but not eliminating the risk of marks by an aggressive support of the tool, either by hand, but by requiring a significant workforce.

 The device according to the invention overcomes this drawback.

It comprises, in fact, a hard plastic cylinder whose outer surface is coated by two superimposed layers of synthetic foam of different density, this cylinder is reinforced in its internal volume by a structure in
X in hard plastic and attaches to the sleeve of a simple drill-type engine block by a metal rod emerging from one of these bases, the engine block being used to rotate the cylinder.

 The outer surface of the last layer of synthetic foam is fully plasticized.

 An adhesive sandpaper of the same dimension as the plasticized cylindrical surface is stuck on the latter allowing to replace it after wear or to change its quality.

 The thickness of the two layers, their difference in quality density and their superposition makes it possible to absorb the pressure of the tool by the user on the surface to be sanded.

Figure L shows in longitudinal section the device according to the invention
Figure dL shows in front section the device according to the invention.

 The device shown in FIG. 2 comprises a cylinder (1) reinforced in its internal volume by an X-shaped structure (7) having dimensions of the order of 8 cm for its diameter and variable for its height a sealed metal rod (2) at the center of the X-shaped structure (7) over the entire height of the cylinder emerges from the center of a cylindrical base for a dimension of the order of 8cm.

 A layer of high density synthetic foam (3) and thickness of the order of 1.5 cm is bonded over the entire cylindrical outer surface, a second layer of low density synthetic foam (4) and thickness of l the order of 1.5 cm is bonded to the entire cylindrical outer surface of the layer of high density synthetic foam (3); the outer surface of the layer of low density synthetic foam is fully plasticized (5) an adhesive sandpaper (6) sticking to the cylindrical part of this plasticized surface (5).

 According to a variant, the height of the cylinder can be modified according to the different shapes of surface to be worked.

 The layer of high density and high resilience synthetic foam allows the tool to be firmly pressed by the user on the surface to be sanded and absorbs the vibrations of the tool in operation.

 The layer of low density and high resilience synthetic foam allows this pressure to be absorbed and shaped on the surface to be sanded.

 The superimposition of the two layers of synthetic foam and their difference in density allows easy work for the user without risk of damage to the surface to be sanded, the tool is rotated around its metal rod by a motor unit type simple drill on which it is fixed, which facilitates its handling and allows an appreciable time saving.

 In the embodiment according to Figure t the two bases of the cylinder form a rim, allowing lateral support to the layer of high density synthetic foam (3).

 The device according to the invention is particularly intended for sanding car bodies and boat hulls before applying a paint.

Claims (6)

 1) Device for sanding flat or curved surfaces characterized in that it comprises a cylinder reinforced in its internal volume by an X structure, and a metal rod, one end of which emerges from the center of a base this cylinder, and the two parallel bases of the cylinder bordering the sylindrical surface, and over the entire cylindrical surface two superimposed layers of synthetic foam, polyether type of different density, and the last thickness of synthetic foam being plasticized over its entire outer surface and an adhesive sandpaper glued over the entire cylindrical plasticized surface.  2) Device according to claim 1 characterized by a thickness of synthetic polyether foam of high resilience of high density bonded over the entire cylindrical outer surface.  3) Device according to claim 1 or claim 2 above characterized in that a layer of low density polyether synthetic foam of high resilience is superimposed by bonding over the entire cylindrical outer surface of the layer of high density synthetic foam.  4) Device according to any one of the preceding claims, characterized in that the outer surface of the low density layer is plasticized.  5) Device according to any one of the preceding claims, characterized in that the abrasive paper is adherent over the entire plasticized cylindrical outer surface of the layer of low density synthetic foam.  6) Device according to any one of the preceding claims, characterized in that the cylinder and the X-shaped structure are made of hard plastic.