Sander Used in Particular for Sanding of Flat, Concave, and Covex Surfaces and the Method of its Utilsation

Abstract

The sander for sanding particularly of the flat, concave and convex surfaces and the method of its usage is based on the fact, that the sanding tool (paper, linen or other carrier with sanding abrasive layer) is pressed onto the grinded surface by means of a flexible pressure plate able to copy the concave and convex surfaces with the possibility to set accurately the radius of this curve. The principle of the technical solution of the invention of the flexible pressure plate consists in the fact, that the pressure generated during the work onto the body, handle, or handles of the sander with mechanical drive is transferred onto this pressure plate at least at two points simultaneously or over at least one balance beam.

1 . A sander used in particular for sanding of flat, concave, and convex surfaces characterized by that it comprises of at least one flexible pressure plat, at least one Balance bar, at least one bracket, at least one pin, at least one Pull-bar, and sanding tools. 
     
     
         2 . A sander used in particular for sanding of flat, concave, and convex surfaces according to  claim 1  characterized by that, the bracket is tightly connected to a pressure plate and movably connected to pull-bar using pins, so as to allow drift of at least one bracket of the pressure plate with respect to a balance bar, where the balance bar is at its end fitted with an opening ( 26 ) and mounted statically to a bracket using a pin. 
     
     
         3 . A sander used in particular for sanding of flat, concave, and convex surfaces according to  claim 1  characterized by that, the balance bar is at its end fitted with a notch, into which the pin and bracket are mounted in a movable way. 
     
     
         4 . A sander used in particular for sanding of flat, concave, and convex surfaces according to any convex surfaces according to  claim 1  characterized by that, in case of two or more balance bars the third and any addition balance bars are fitted with bridging via other balance bars, where the bottom balance bars are also used as brackets. 
     
     
         5 . A sander used in particular for sanding of flat, concave, and convex surfaces according to  claim 1  characterized by that the pull-bars lead into pins of pressure plate or even pins of balance bars of the body or to a holder of a sander fitted with revolving pins with lateral opening allowing free passage of the pull bar. 
     
     
         6 . A sander used in particular for sanding of flat, concave, and convex surfaces according to  claim 1  characterized by that the pin is in its axis fitted with a locking screw to affix the position of the pull-bar to this pin. 
     
     
         7 . A sander used in particular for sanding of flat, concave, and convex surfaces according to  claim 1  characterized by that it is completely covered by a stationary cover preferably a flexible bellows, that is pressed down using flat shaped springs, where the cover is fitted with openings for abrasion dust suction in case the pressure plate and the sander material are fitted with suction openings. 
     
     
         8 . A sander used in particular for sanding of flat, concave, and convex surfaces according to  claim 1  characterized by that the flexible pressure plate of the sander is fitted with mechanical drive actuator embodying a bottom surface of the pressure plate fitted with at least one movable profiled plate with mechanical drive moving linearly between the pressure plate and the sanded surface, where the bottom surface of the movable profiled plate is fitted with a known system for affixing the sanding tool, mainly sanding paper or cloth or even abrasive material. 
     
     
         9 . A sander used in particular for sanding of flat, concave, and convex surfaces according to  claim 1  characterized by that it comprises at least two or more flexible pressure plates moving in the same axis of a single flexible pressure plate, but always in reciprocally opposite direction. 
     
     
         10 . A sander used in particular for sanding of flat, concave and convex surfaces according to any of the  claim 1  characterized by that in the area where the pressure plate profile verges from side surfaces to top surface of the pressure plate, the pressure plate profile is evenly fitted with lateral notches. 
     
     
         11 . A sander used in particular for sanding of flat, concave, and convex surfaces according to  claim 1  characterized by that it comprises at least two or more interconnected pressure plates and at least two or more sanding belts with adjustable speed, where these belts move in reciprocally opposite direction. 
     
     
         12 . A sander used in particular for sanding of flat, concave, and convex surfaces characterized by that the sanding tool is pressed to the sanded surface by a flexible pressure plate which is able to follow concave and convex surface with an option of accurate setting the radius of such a curve. 
     
     
         13 . A method of sanding flat, concave and convex surfaces with a sander according to  claim 12  characterized by that the generated pressure on the body, holder, or sander holder with mechanical drive is transmitted simultaneously to a pressure plate in at least two or more areas and/or over at least one or more balance bars. 
     
     
         14 . A method of sanding flat, concave and convex surfaces according to  claim 12  characterized by that an identical pressure is applied to at least two or more places of the pressure plate using preferably a bracket. 
     
     
         15 . A method of sanding flat, concave and convex surfaces according to  claim 12  characterized by that the pressure plate presses the sanding tool (paper, cloth or other carrier of abrasive layer) to a sanded surface in all the length of the sanding tool applying approximately constant pressure, which is evenly applied on the entire line of the sanding surface. 
     
     
         16 . A method of sanding flat, concave and convex surfaces by a sander according to  claim 1  characterized by that the curvature of the pressure plate can be affixed using pull-bars. 
     
     
         17 . A method of sanding flat, concave and convex surfaces by a sander according to  claim 12  characterized by that the curvature is set using a stoking template. 
     
     
         18 . A method of sanding flat, concave and convex surfaces by a sander according to  claim 12  characterized by that abrasion dust suction is also ensured by that a flexible cover plate is pressed through a sealing rubber to a top part of another flexible pressure plate where between these two plates there exists an enclosure where the cover plate is not connected to the pressure plate in any solid way thus having on vital effect on the flexibility of the pressure plate. 
     
     
         19 . Utilization of the sander and method of sanding flat, concave and convex surfaces with manual abrasive planes, as well as machine driven sanders either linear or band-type according to  claim 1 .