摘要:
An AND gate (40) includes first and second input leads (42,43) and an output lead (44). The AND gate (40) includes a first N channel MOS ("NMOS") transistor (58) which couples the output lead (44) to ground in response to the signal (IN1) on the first input lead (42) and a second NMOS transistor (60) which couples the output lead (44) to ground in response to the signal (IN2) on the second input lead (43). A buffer (76) having a high output impedance is coupled to the output lead (44) and tends to maintain the output lead (44) in a constant state. When the signal on the first input lead (42) goes high, the first NMOS transistor (58) turns off and a PMOS transistor (64) turns on, thereby coupling the output lead (44) to a high voltage source (V H ) for a predetermined time period. If the second NMOS transistor (60) is off, the resulting pulse causes the AND gate output signal (Vout) to go high. The high impedance buffer (76) maintains the output lead (44) in the high state.
摘要:
In a safety harness, a strap length adjustment device (10) has an adjustment member (20) selectively movable generally longitudinally of the strap (9), the strap preferably extending around the member so that twice the length of strap is protracted or retracted per unit movement of the member. The adjustment member (20) may be held in a selected position against a spring (29) tending to retract the strap by spring-biassed caliper jaws (30) released by a push button (37). The device (10) may be embodied as an abdominal pad in a child's harness for use or incorporated in a pushchair or a vehicle safety seat.
摘要:
A process for forming a buried layer 22 comprises the steps of covering a wafer (10) with a silicon dioxide layer (18). Dopants are introduced into the silicon dioxide layer (18) via an ion implantation process. Thereafter, a second silicon dioxide layer (20) is grown on the first silicon dioxide layer (18) and the wafer (10) is then subjected to a heating process which serves to both anneal the silicon wafer and drive dopants implanted into the first silicon dioxide layer (18) into the silicon wafer. In this way, crystal lattice damage which normally accompanies ion implantation is avoided. The second silicon dioxide layer (20) prevents out diffusion of the implanted ions from the first silicon dioxide layer (18) into the atmosphere. The first and second silicon dioxide layers (18,20) are then removed and an epitaxial layer (24) is formed on the wafer (10). A base region (48) and emitter region (46) are then formed in the epitaxial layer (24).
摘要:
Une unité de pompe ou de compresseur (1) particulièrement utile pour des fluides à phase mixte, par exemple du gaz et du pétrole mélangés, comprend un dispositif compresseur à écoulement axial à plusieurs étages à ailettes contra-rotatives. Un dispositif mélangeur (10) en amont et un dispositif propulseur centrifuge (32) en aval peuvent être tous les deux entraînés par le dispositif compresseur (21, 26, 27, 29), qui peut être formé de façon à créer un passage d'écoulement à section transversale décroissante dans le sens de l'écoulement. L'entraînement du compresseur peut être fourni par des moteurs électriques (24, 25) axialement adjacents qui peuvent entourer des manchons rotatifs (21) portant les ailettes du compresseur. Un fluide peut être mis en circulation dans l'unité, par exemple à des fins d'isolation électrique, et peut s'infiltrer dans le fluide pompé à travers des joints d'étanchéité, auquel cas il peut contenir un agent anti-corrosif. L'unité peut être agencée de façon à se déplacer dans une conduite sous pression d'un fluide pour contacter des points d'alimentation en énergie à un endroit prédéterminé.
摘要:
A power assisted vehicle steering system comprises a sensor (25) providing an output dependent on the steering effect applied to a steering wheel (10) and an electric motor (16) responsive to the sensor output to apply a steering drive to a steerable vehicle wheel. The sensor and motor can be located in the region of the steering wheel and can be constituted as a kit for adding a power steering facility to a vehicle without one. The sensor output may be modified at will or in response to vehicle experience and a switch can be provided to render the system inoperative.
摘要:
A phosphorous acid or mixture of phosphorous acids is used as catalyst in the esterification reaction of phenol and carboxylic acids. Water is removed from the reaction zone in an efficient manner. An ester product of high purity and excellent color with minimal by-products is characteristically produced.
摘要:
For use with a vehicle seat belt guide comprising a mounting plate (5,6) secured around one side portion of an elongate running loop (1), there is provided a cover (15) having a portion which makes a snap-fit over the other portion (4) of the loop to provide a larger radius running surface to be engaged by the belt and a portion which encloses the mounting plate and makes a snap-fit therewith. The cover can provide a tongue portion (22) which restricts the area of the loop to resist folding of the belt.
摘要:
The keys (12) of the keyboard of an electronic instrument interact with A-shaped action arms (26) pivoted adjacent the apex, and weighted (36) at the cross bar. The free ends of the limbs (48, 50) of each action arm engage above and below the rail of the associated key. An actuator (46) on each action arm operates an electric sensor in the form of a break-before-make switch (34).