摘要:
A latch secures an element such as a motor-vehicle headrest for movement relative to a support between a rest position and an advanced position. A pivotal lever can hold the element in the rest position. A spring pushes the element into the advanced position and presses it against the lever so as to apply a torque to the lever that presses a latch formation on the lever against a retractile latch part of an actuator. If the actuator retracts the part, the lever is released and the lever can pivot to allow the spring to move the element into the advanced position.
摘要:
A latch secures an element such as a motor-vehicle headrest for movement relative to a support between a rest position and an advanced position. A pivotal lever can hold the element in the rest position. A spring pushes the element into the advanced position and presses it against the lever so as to apply a torque to the lever that presses a latch formation on the lever against a retractile latch part of an actuator. If the actuator retracts the part, the lever is released and the lever can pivot to allow the spring to move the element into the advanced position.
摘要:
A headrest for a motor vehicle seat is crash active in that it has a mechanism for automatically bringing the head-engaging member toward the head of the passenger in the case of a crash. This mechanism includes a slide guided on a pair of cylindrical members surrounded by springs and having a tooth-forming part of a return travel lock preventing return of the slide to its starting position. In that position a releasable coupling device has a primary coupling element engaged with a secondary coupling element which may be a hairpin-shaped bent wire.
摘要:
A headrest for a motor vehicle seat is crash active in that it has a mechanism for automatically bringing the head-engaging member toward the head of the passenger in the case of a crash. This mechanism includes a slide guided on a pair of cylindrical members surrounded by springs and having a tooth-forming part of a return travel lock preventing return of the slide to its starting position. In that position a releasable coupling device has a primary coupling element engaged with a secondary coupling element which may be a hairpin-shaped bent wire.
摘要:
The invention relates to a process for the preparation of pyridine-2,3-dicarboxylic acid esters using novel maleic acid esters as starting materials. In the process, in a first process step, 2,3-dihalomaleic acid esters are reacted with ammonia, or ammonium salts, with the exclusion of water at a temperature of at least 50.degree. C. to form novel 2-amino-3-halomaleic acid esters, and these are subsequently reacted further in a second process step with .alpha.,.beta.-unsaturated aldehydes, or ketones, in the presence of an acidic catalyst and acid-binding agents at a temperature of at least 50.degree. C. with heat being supplied until the pyridine-2,3-dicarboxylic acid esters have been formed. Pyridine-2,3-dicarboxylic acid esters of this type can be used, for example, as intermediates for synthesis of herbicides based on imidazoline. The present invention also relates to novel 2-amino-3-halomaleic acid esters, which are useful for producing the final product pyridine-2,3-dicarboxylic acid esters.
摘要:
Housing for shielding from electromagnetic interference, comprising a first housing component with a first VELCRO-type fastening element and a second housing component with a second VELCRO-type fastening element each made of conductive material, wherein an aperture between the first housing component and the second housing component is closed in an electromagnetically-sealing manner by a third VELCRO-type fastening element made of conductive material.
摘要:
A medium containing tanning agents and/or albumens, such as beer, wine, or fruit juice, is simultaneously stabilized and filtrated by means of cross-flow filtration in the ultrafiltration or microfiltration range, in the presence of a stabilizer.
摘要:
The invention relates to a process for the preparation of .beta.-ketocarboxylic acid esters of the general formula ##STR1## in which R.sup.1 is an alkyl radical having 1 to 4 C atoms, R.sup.2 is an alkyl radical or alkenyl radical having 2 to 15 C atoms or a phenyl radical and R.sup.3 is hydrogen or an alkyl or alkenyl radical having 1 to 6 C atoms, characterized in that acetocarboxylic acid esters of the general formula ##STR2## in which R.sup.1 and R.sup.3 are as defined, are reacted with calcium hydroxide or calcium oxide in the presence of an organic solvent and in the absence of water, the calcium chelate complexes formed are acylated with carboxylic acid chloride and the products are then cleaved with aqueous ammonium salt solution to form the .beta.-ketocarboxylic acid esters of formula (I).The .beta.-ketocarboxylic acid esters readily accessible by the process according to the invention can be used as important intermediates in the synthesis of pharmaceutically active ingredients or plant protection agents.
摘要:
The invention relates to a process for the preparation of pyridine-2,3-dicarboxylic acid esters using novel maleic acid esters as starting materials. In the process, in a first process step, 2,3-dihalomaleic acid esters are reacted with ammonia, or ammonium salts, with the exclusion of water at a temperature of at least 50.degree.0 C. to form novel 2-amino-3-halomaleic acid esters, and these are subsequently reacted further in a second process step with .alpha.,.beta.-unsaturated aldehydes, or ketones, in the presence of an acidic catalyst and acid-binding agents at a temperature of at least 50.degree. C. with heat being supplied until the pyridine-2,3-dicarboxylic acid esters have been formed. Pyridine-2,3-dicarboxylic acid esters of this type can be used for example, as intermediates for synthesis of herbicides based on imidazoline. The present invention also relates to novel 2-amino-3-halomaleic acid esters, which are useful for producing the final product pyyridine-2,3-dicarboxylic acid esters.
摘要:
A candle filtration unit of the type having a filter vessel, a wall plate disposed within the vessel and dividing its interior into a lower feed section and an upper discharge section, a plurality of filter candles suspended from the wall plate, a sediment receptacle connected to the lower feed section via shut-off means, and means for supplying cleaning liquid to the upper section to create a backflow through the unit to remove sediment deposited on the filter candle, is provided with accumulating means associated with the upper end of each filter candle to prevent the flow of cleaning liquid into the candles until an adequate quantity of liquid has accumulated in the discharge section and a predetermined pressure differential between the pressure in the discharge section and the pressure in the feed section is achieved.