Abstract: The invention relates to a tensioning ring (1) having a tensioning section (3), the tensioning section (3) comprising a wedge element (6), a guide member (7a) and a tensioning screw (5), wherein a width of the tensioning section (3) and thus a circumference of the tensioning ring (1) can be changed by tightening the tensioning screw (5), for which purpose the wedge element (6) is guided at the guide member (7a) and is movable in this guide along a movement way (20a) at the guide member (7a) by tightening the tensioning screw (5), the movement way (20a) having a portion in a width direction (4) determining the width of the tensioning section (3), wherein the wedge element (6) and the guide member (7a) engage in one another with an undercut in such a way that they are held together in a form-locking manner with respect to the width direction (4).

Abstract: The invention relates to a tensioning ring (1) having a tensioning section (3), the tensioning section (3) comprising a wedge element (6), a guide member (7a) and a tensioning screw (5), wherein a width of the tensioning section (3) and thus a circumference of the tensioning ring (1) can be changed by tightening the tensioning screw (5), for which purpose the wedge element (6) is guided at the guide member (7a) and is movable in this guide along a movement way (20a) at the guide member (7a) by tightening the tensioning screw (5), the movement way (20a) having a portion in a width direction (4) determining the width of the tensioning section (3), wherein the wedge element (6) and the guide member (7a) engage in one another with an undercut in such a way that they are held together in a form-locking manner with respect to the width direction (4).

Abstract: A workpiece mounting for a working machine, with a circular mounting plate rotatable in a horizontal plane for chucking a workpiece and with a conveying unit for moving the mounting plate in the horizontal plane, wherein the mounting plate is movable on air support on a horizontal table, and is clampable on the conveying unit in any desired rotational position.

Abstract: A workpiece mounting for a working machine, with a circular mounting plate rotatable in a horizontal plane for chucking a workpiece and with a conveying unit for moving the mounting plate in the horizontal plane, wherein the mounting plate is movable on air support on a horizontal table, and is clampable on the conveying unit in any desired rotational position.

Abstract: Disclosed and claimed is a process for selectively separating hydrogen halides from sulfur-dioxide-containing gases by using an adsorbent made from a porous ceramic support material which is impregnated with an alkaline earth metal salt solution and, after evaporation of the solvent, the alkaline earth metal salt is pyrolysed at 200.degree. to 800.degree. C. to give alkaline earth metal oxide .Xh.sub.2 O, where x is a number from 0 to 1.

Abstract: A process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid using potassium carbonate and CO at temperatures above 260.degree. C. and at a pressure of at least 10 bar comprises using 2-hydroxynaphthalene-3-carboxylic acid and/or 2-hydroxynaphthalene-3,6-dicarboxylic acid and/or their potassium salts and, if desired, potassium .beta.-naphtholate as starting materials.The process according to the invention enables a considerable increase, by reusing the secondary products, in the product selectivity with regard to 2-hydroxy-naphthalene-6-carboxylic acid.

Abstract: A process for the preparation of aromatic hydroxy carboxylic acids by reacting alkali metal phenolates or alkali metal naphtholates with alkali metal carbonates and carbon monoxide, with subsequent acidification, wherein the solid starting materials--alkali metal carbonate and/or alkali metal phenolate or naphtholate--are metered into the reaction mixture in the form of one or more dispersions in an inert organic liquid.The process according to the invention enables the preparation of aromatic hydroxy carboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as described for example for the Kolbe-Schmitt reaction in EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, and for the reaction with CO and carbonate in, for example, WO 91/11422, are unnecessary.

Abstract: A process for preparing aromatic hydroxycarboxylic acids or di-salts thereof by reaction of alkali metal phenolates or naphtholates with carbon dioxide, in the presence or absence of a further alkali metal salt, which comprises introducing the solid phenolate or naphtholate starting materials and, if desired, the alkali metal salt into the reaction mixture batchwise or continuously, separately or together, in the form of a dispersion in an inert organic liquid.The process of the invention makes possible the preparation of aromatic hydroxycarboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as are described for the Kolbe-Schmitt reaction in, for example, EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, can be omitted.

Abstract: An apparatus for monitoring the air pressure in a pneumatic tire carried by the rim of a vehicle wheel, comprising a sensing element which is arranged at the rim ring and which can be deformed and acted upon by the tire pressure, with a permanent magnet as the measurement value generator, in the region of rotary movement of which is disposed a measurement value sensor which is fixed to the vehicle in a stationary position and which is connected to an evaluation circuit. The apparatus is reliable in operation and uncomplicated in structure.

Abstract: In the case of sensors having a characteristic for which the offset in the quiescent condition has a first temperature coefficient and the slope of the characteristic has a second temperature coefficient, while the quotient of the offset and slope coefficients is approximately constant, a point can be determined in which the characteristics for different temperatures (T) intercept. A temperature corrected measurement value can be determined, preferably with a microcomputer, from the sensor signal, the coordinates of the above-described intersection point, the sensor temperature and the temperature coefficient either of the offset or of the slope.