An electric motor is braked by sensing the polarity of voltage of the alternating electricity for powering the motor and sensing the polarity of the voltage induced in the motor by the back electromotive force. When these polarities are opposite the electricity is applied to the motor to generate a braking torque. The application of the electricity is stopped a given interval after it begins to be applied during consecutive voltage cycles. This interval is derived from the time period between wh...

A projectile interceptor launches a projectile catcher into the path of a projectile. In one embodiment, signals indicative of the path of a projectile are received by the projectile interceptor. A flinger mechanism has a projectile catcher releasably attached thereto, such that the projectile catcher can be released and launched from the flinger mechanism. A controller connected to the flinger mechanism uses the signals indicative of the path of the projectile to determine the launch parameters...

A method of stopping nose bleeds at the Little's area employs a single-piece flattened strip of material that is inserted into a nostril. The strip has sufficient rigidity to permit the strip to be manually inserted by grasping a lower region between the thumb and fingers, has side surface area sufficient to cover the Little's area, and is flexible enough to conform to the shape of the Little's area. The nose is compressed from the outside into direct engagement with the intermediate region of t...

A mine stopping installed in a mine passageway includes a plurality of elongate panels extending generally vertically in side-by-side relation from a floor to a roof of the passageway to at least partially close the passageway. A generally horizontal elongate brace extends generally between the walls of the passageway adjacent to the panels. A generally vertical column extends from the floor to the roof and is adapted for reinforcing the brace. Braces and anchor beams for stoppings are also disc...

A sewing machine includes a sewing needle, a lower looper, a motor for driving the sewing machine, and a controller for controlling the driving and stopping of the motor. When, in the sewing machine, the controller operates to stop the motor, stop control means operates to stop the motor such that said sewing needle is stopped at a time corresponding to the time just before the sewing needle reaches the bottom dead point and to the time that a needle thread disengages from the sharp tip of the l...

An elevator system stopping control generates the difference between the actual speed value and a set point speed value on the transition from an unregulated travel phase to the regulated arrival or braking phase and prevents that difference from becoming effective so that the travel comfort is not impaired and the stopping accuracy remains assured. For this purpose, a multiplication factor is formed from the actual speed value and an associated nominal speed value by means of a divider during t...

A bicycle braking device includes a second drive assembly between the crankshaft and the rear axle of the bicycle. The second drive assembly includes a chain drive and pair of engaged gears for reversing the direction of rotation of the crankshaft with respect to the rear axle when the second drive is engaged. The device further includes a clutch for selectively engaging or disengaging the assembly. When the bicycle is moving forward and the second drive is engaged, the pedals will rotate in rev...

Disclosed is an air conveyor comprised of a deck having multiple openings and an underlying plenum containing air under pressure. The air from the plenum issues through the openings as jets to lift articles and advance them along a predetermined path spaced above the deck. To stop the articles, a second plenum is disposed within the first mentioned plenum and in communication with the openings through the conveyor deck at a location at which the article is to be stopped. A normally open valve pr...

A backstop member for use in an insertion station operative to insert an enclosure collation into an open end of an envelope. The insertion station having a deck with a transport mechanism for conveying an envelope, an opening mechanism for opening an envelope and a backstop member mounted below the deck for stopping the envelope in the insertion station preparatory to insertion of the enclosure collation. The backstop member includes an elongate stopping portion having a substantially planar su...

After a running stop command is released, a pump P2 for transferring a solution from the absorber 2 to a regenerator 3 is kept running. The transfer of the solution permits separation of the solution from a refrigerant during non-operation of the refrigerator. The solution saved in the regenerator 3 remains at as a high concentration of the absorbent as that before the end of the operation while the refrigerant is saved in an evaporator 1. This enables the refrigerator to restart its normal oper...