An apparatus for preventing collision of a vehicle comprises A device for measuring a distance R from a driving vehicle to an obstacle and a relative velocity V of the driving vehicle to said obstacle; A circuit for generating a damping signal when the relation of the distance R, the relative velocity V and a preset deceleration .alpha. becomes the relation of R < V.sup.2 /2.alpha.; a deceleration detector for detecting the actual deceleration .alpha.' of the driving vehicle; A correction cir...

The present lock assembly is to prevent rotation of a gun cylinder or similar rotatable body. The lock assembly has a housing that is slidably insertable into a chamber in the gun cylinder from the back end. An eccentric lock at the front end of the lock housing is slidably insertable through the cylinder chamber, after which it may be turned to a locking position in front of the cylinder by a key inserted into the back end of the lock housing. Within the lock housing an off-center shaft carries...

The invention is an apparatus for preventing mercury contamination during such processes as removing excess mercury from dental silver amalgam, mulling dental silver amalgam, and loading dental silver amalgam into a dispenser. The apparatus comprises a material permeable by free mercury under pressure and impermeable by dental silver amalgam. One surface of this material is enclosed by a flexible covering impermeable by either free mercury or mercury vapor. One or more voids are provided between...

A method for preventing web rewetting in a paper making machine of the type comprising a forming cylinder with an apertured or perforated periphery, with or without a foraminous belt wrapped around the cylinder, on which cylinder there is formed, during rotation of the cylinder, a paper web by a pressure slice to which paper slurry or stock is supplied, the paper web remaining on the periphery of the cylinder or belt over a major portion thereof, while water is drawn from the web by means of one...

A protective element for preventing electrostatic puncture of a semiconductor integrated circuit comprises a semiconductor substrate of one conductivity type, a first semiconductor region of the opposite conductivity type formed within a selected part of the surface of the semiconductor substrate, and a second semiconductor region of the one conductivity type formed within a selected part of the surface of the first semiconductor region, the first and second semiconductor regions being partially...

Cushions and cushion arrangements for preventing and alleviating bedsores comprising a cushion structure including a casing having a porous upper portion of artificial sheepskin or similar material, a resilient cushion within the casing, means for supplying temperature-controlled air to the casing, and means within the casing for directing the air so as to cause it to pass through the porous upper portion of the casing, over substantially the entire area thereof, into contact with the body of th...

A weatherproof electrically insulative mat having an electrical heat producing conductor therein and adapted for placement on an exterior surface to prevent accumulation of snow on such surface. A control system for supplying current to the conductor including a precipitation sensor, a temperature sensor and a control unit responsive to the sensors so that power is supplied to the conductor in the mat only when there is precipitation and the temperature is below 35.degree.. An improved mat struc...

A device for preventing collision of trains includes two units, a stationary signal sending unit mounted on the wayside and a moving control unit mounted on the locomotive. The signal sending unit including the traffic light system transmits a D. C. voltage, zero, positive, or negative value, representing red, yellow, or green traffic light, to the control unit through two contacts, one mounted on the wayside and one mounted on the locomotive. The control unit includes an electro-responsive valv...

A noise preventing shock absorber adapted for silently absorbing the sound due to noise sources, as when moving machine parts engage mating surfaces and decelerate to zero velocity within a short travel distance or stroke. The shock absorber member includes a unitary resilient member which is dish-shaped in vertical cross section and provided with an axial bore therethrough, with the peripheral surface of the axial bore forming an inner force-transmitting surface. An upper force-receiving means ...

Slidable gates controlling the flow of coal from a coal bunker into hoppers on a larry car are opened, and simultaneously electric power to the travel circuit of the larry car is interrupted through control circuitry. Also, simultaneously a signal from a transmitter is received by a receiver and an interlock system is activated that prevents power from being restored to the travel circuit larry car until the gates are closed. When the gates are closed, the signal does not reach the receiver and ...