Abstract: A device for restoring a light permeability of headlight lenses of motor vehicles has a holder, a working layer attached to the holder and adapted to clean and polish a surface of a headlight lense when the device is moved relative to the latter, and a sponge-like element located between the holder and the working layer and formed so that it applies an elastic biasing action to the working layer to provide a cleaning and polishing action by the working layer and at the same time to absorb a liquid required for the cleaning and polishing action.

Abstract: A device for restoring a light permeability of headlight lenses of motor vehicles has a holder, a working layer attached to the holder and adapted to clean and polish a surface of a headlight lense when the device is moved relative to the latter, and a sponge-like element located between the holder and the working layer and formed so that it applies an elastic biasing action to the working layer to provide a cleaning and polishing action by the working layer and at the same time to absorb a liquid required for the cleaning and polishing action.

Abstract: Fine abrasive machining of a part includes providing a tool having a plurality of successive portions configured and arranged so that each preceding portion provides a coarser abrasive machining while each subsequent portion provides a final abrasive machining, and providing a relative movement of the abrasive tool relative to the part so that first a portion of the tool configured a coarser abrasive machining machines a part and thereafter a portion of the tool configured for a finer machine provides abrasive machining of the part.

Abstract: A method of producing abrasive tools with abrasive particles consisting of Al2O3 has the steps of producing a mixture of initial components with particles of Al(OH)3, forming blanks of an abrasive tool from the mixture of the initial components with the particles of AL(OH)3, subsequently producing the abrasive tools with the abrasive particles of Al2O3 by subjecting the blanks to a heat treatment such that the particles of Al(OH)3 are converted into the abrasive particles of Al2O3 in the tools, wherein the forming includes rolling a sheet from the mixture of the initial components with the particles of Al(OH)3 before the heat treatment and conversion of the particles of Al(OH)3 the abrasive particles of Al2O3 which particles of Al(OH)3 are softer than the abrasive particles of Al2O3 and therefore do not damage a rolling equipment, and thereafter separating the blanks of the abrasive tools from the sheet for the subjecting to the heat treatment.

Abstract: A method of producing polyurethane pads and other articles has the steps of providing at least one polyurethane layer having a first curing agent, providing a second polymer layer having a second curing agent, providing a connecting layer between the first and second layers with the first curing agent as in the first polyurethane layer, and subjected the layers to a thermal treatment so that the same first curing agent migrates from the connecting layer to the first polyurethane layer and vice versa. Also, an article produced by the method is proposed.

Abstract: A method of producing abrasive tools with abrasive particles consisting of Al2O3 has the steps of producing a mixture of initial components with particles of Al(OH)3, forming blanks of an abrasive tool from the mixture of the initial components with the particles of AL(OH)3, subsequently producing the abrasive tools with the abrasive particles of Al2O3 by subjecting the blanks to a heat treatment such that the particles of Al(OH)3 are converted into the abrasive particles of Al2O3 in the tools, wherein the forming includes rolling a sheet from the mixture of the initial components with the particles of Al(OH)3 before the heat treatment and conversion of the particles of Al(OH)3 the abrasive particles of Al2O3 which particles of Al(OH)3 are softer than the abrasive particles of Al2O3 and therefore do not damage a rolling equipment, and thereafter separating the blanks of the abrasive tools from the sheet for the subjecting to the heat treatment.

Abstract: A polishing pad for polishing curved surfaces has a pad element having an axis, a central opening adjoining the axis and forming an inner edge, and an outer peripheral edge, first engaging means provided on the outer peripheral edge for engaging an outer periphery of a curved supporting body, and second engaging means provided on the inner edge of the pad element and engageable with a central opening of the curved supporting body, the first and second engaging means being harder than the pad element.

Abstract: A method of producing polyurethane pads and other articles has the steps of providing at least one polyurethane layer having a first curing agent, providing a second polymer layer having a second curing agent, providing a connecting layer between the first and second layers with the first curing agent as in the first polyurethane layer, and subjected the layers to a thermal treatment so that the same first curing agent migrates from the connecting layer to the first polyurethane layer and vice versa. Also, an article produced by the method is proposed.

Abstract: A method of producing abrasive tools with abrasive particles composed of aluminum oxide has the steps of producing a mixture of initial components with particles of Al(OH)3, forming blanks of abrasive tools from the mixture, and subsequently subjecting the blanks to a heat treatment so that the particles of Al(OH)3 are converted into abrasive particles of Al2O3.

Abstract: An abrasive tool for abrasive treatment of curved surfaces, has a base; abrasive elements arranged on the base; and a connecting layer connecting the abrasive elements to the base, the connecting element being composed of an elastic material selected so that when a central area of the abrasive tool is displaced to impart to the abrasive tool a curved shape in correspondence with a curved shape of the object to be abrasively treated, a central area of the connecting layer stretches and the abrasive elements do not peel off from the base.

Abstract: An abrasive tool for abrasive treatment of curved surfaces, has a base; abrasive elements arranged on the base; and a connecting layer connecting the abrasive elements to the base, the connecting element being composed of an elastic material selected so that when a central area of the abrasive tool is displaced to impart to the abrasive tool a curved shape in correspondence with a curved shape of the object to be abrasively treated, a central area of the connecting layer stretches and the abrasive elements do not peel off from the base.

Abstract: A polishing pad for polishing glass and the like has a working layer with a plurality of polishing grains, an attaching layer with which the polishing pad is attachable to a polishing head of a power tool, and a connection layer which connects the working layer, with the attaching layer, and the connection layer is composed of vulcanizable material, which is vulcanized at certain temperature and under certain pressure and thereby connects the working layer with the attaching layer.

Abstract: A polishing pad for polishing glass and the like has a working layer with a plurality of polishing grains, an attaching layer with which the polishing pad is attachable to a polishing head of a power tool, and a connection layer which connects the working layer, with the attaching layer, and the connection layer is composed of vulcanizable material, which is vulcanized at certain temperature and under certain pressure and thereby connects the working layer with the attaching layer.