Abstract: A central release unit for a hydraulic clutch actuator has a plastic cylinder housing which is produced by injection molding and which has at least one cylinder wall provided, on an outer circumference, with a reinforcement sleeve. The reinforcement sleeve can be fastened to the cylinder wall after the injection molding of the cylinder housing, for which purpose a snap-action connection is provided on a forward end, which faces away from the pressure connection piece, of the reinforcement sleeve. The connection is formed by a radially inwardly bent detent portion of the reinforcement sleeve and by a rib integrally formed on the outer circumference of the cylinder wall. The reinforcement sleeve has a main portion which adjoins the detent portion and which is of conical shape complementary to an outer circumferential surface, which is of conical form in the reinforcement region, of the cylinder wall.

Abstract: A central release unit for a hydraulic clutch actuator has a plastic cylinder housing which is produced by injection molding and which has at least one cylinder wall provided, on an outer circumference, with a reinforcement sleeve. The reinforcement sleeve can be fastened to the cylinder wall after the injection molding of the cylinder housing, for which purpose a snap-action connection is provided on a forward end, which faces away from the pressure connection piece, of the reinforcement sleeve. The connection is formed by a radially inwardly bent detent portion of the reinforcement sleeve and by a rib integrally formed on the outer circumference of the cylinder wall. The reinforcement sleeve has a main portion which adjoins the detent portion and which is of conical shape complementary to an outer circumferential surface, which is of conical form in the reinforcement region, of the cylinder wall.

Abstract: A central release device (10) is disclosed having a cylinder housing (12), with a cylindrical wall (14), and a guide sleeve (16), which is arranged concentrically therewith and on which an annular piston (18), which can be operatively connected to a clutch and can be hydraulically actuated by way of a pressure chamber (20) defined by the cylindrical wall and the guide sleeve, is displaceably guided. At its end the guide sleeve has an annular flange (22) with an end face (24) facing away from the annular piston and a radially outer circumferential surface (26), by way of which flange the guide sleeve is fixed to an end face (28) of the cylinder housing.

Abstract: A central release device (10) is disclosed having a cylinder housing (12), with a cylindrical wall (14), and a guide sleeve (16), which is arranged concentrically therewith and on which an annular piston (18), which can be operatively connected to a clutch and can be hydraulically actuated by way of a pressure chamber (20) defined by the cylindrical wall and the guide sleeve, is displaceably guided. At its end the guide sleeve has an annular flange (22) with an end face (24) facing away from the annular piston and a radially outer circumferential surface (26), by way of which flange the guide sleeve is fixed to an end face (28) of the cylinder housing.

Abstract: The invention relates to a clasp having coverable clasp parts, comprising a clasp upper part (1) of dish-shaped cross section and, pressable into the latter, a clasp lower part (2) of dish-shaped cross section, the upper and lower surfaces facing one another and the internal space of the clasp serving to receive the ends (9) of the covering material (3) surrounding the clasp upper part (1). The lower surface and the upper surface of the clasp do not run parallel to one another. The plane (5) of the lower surface of the clasp lower part (2) runs parallel, however, to the plane (7) of the edges of the open underside (7) of the clasp upper part (1), and the open plane of the upper side (6) of the clasp lower part (2) runs parallel to the upper side (4) of the clasp upper part (1) forming the upper surface. Furthermore, the invention also relates to an apparatus for producing the fabric-covered clasp.

Abstract: Feller attachment for a heat-sealing machine for belts, with a feller plate (10), with feller gibs on the feller plate, these feller gibs (20, 21) being arranged at a certain distance from each other and extending in the direction of feed and serving to fell a cover material around the interlining of a belt, with a feeding device (51, 52) for a belt cover band, and a comb (40) for stretching and smoothing the cover material over the interlining prior to applying the belt cover band, with an adjusting device for adjusting the distance of the ends (60, 61) of the feller gibs (20, 21) to each other, this adjusting device meshing with the ends (60, 61) of the feller gibs (20, 21) with these ends pointing toward the heat-sealing machine for belts, and consisting of a sliding bar (44) with sliding bearings (41, 42) arranged thereon and a threaded spindle (46) which meshes with tapped holes (62, 63) in the sliding bearings (41, 42), with the threads (64, 65) on both ends of the threaded spindle (46) as well as the t