The present invention relates to a safety device in electrical connection devices, especially lamp-holders, comprising a number of contact parts designed to rest against an object arranged to be connected to the connection device, for example a light bulb socket, and a number of elements arranged to be connected to the electric leads of a cable, whereby the contact parts are at a distance from the respective connector elements and are arranged by means of being pushed in by a spring function to ...

A refractory material contains a small quantity of colloidal silica. The colloidal silica increases the resistance of the material against aggressive slags.

A double seat valve includes a housing with a pair of valve disks independently movable within the housing between a closed position and an open position. Further, the valve disks can also be moved as a unit. A hollow leakage space is located between the valve disks. Leakage can be conveyed from the space to the exterior of the housing. Each valve disk has a separate valve seat and a cylindrically shaped wall surface extends between the valve seats and defines the radially outer boundary of the ...

An extension tube inserted between a single lens reflex camera body and an interchangeable objective lens barrel to extend the photographable range intrinsic to the camera is provided with an aperture value transmitting device through which the diaphragm on the lens barrel side is presettable as the aperture value is determined on the camera body side, thereby it being made possible to effect automatic exposure aperture control when making an exposure at a camera-to-object distance shorter than ...

In the cooling system of a water-cooled engine for a vehicle, a heat exchanger is arranged for heating the interior of the vehicle using the heat extracted from the water which cools the engine. To provide rapid heating of the interior of the vehicle and preheating of the engine, a heating system is incorporated into the cooling system for selectively heating a portion of the cooling water to a desired temperature and then passing the heated water into the heat exchanger for heating the interior...

The present invention relates to an automatic exposure adjusting device for a camera or the like, comprising a single photometric mechanism capable of measuring the light corresponding to the light amount entering into a photosensitive material such as film, the first light amount control mechanism driven in accordance with the output of the photometric mechanism for controlling the light amount over the range of the ordinary brightness and the second light amount control mechanism capable of op...

Starting from an organohydrogenpolysiloxane having at least two hydrogen atoms directly bonded to the silicone atoms, an organohydrogenpolysiloxane is obtained in which part of the silicon-bonded hydrogen atoms have been converted into organic groups and the remaining silicon-bonded hydrogen atoms are left unreacted. The starting organohydrogenpolysiloxane is brought to the partial addition reaction with less than equivalent amount of an organic unsaturated compound having aliphatic double bond ...

A venting and aerating arrangement for closed flow systems for water of fluctuating temperature is disclosed. A vent casing, defining an air collecting chamber, extends upwardly from a horizontal conduit of the system. A float controlled vent valve is arranged in the upper portion of the casing. A grid of spaced rods is arranged in the junction between casing and conduit and extends into the flow passage of the conduit to break up bubbles of air and other gases with the liberated gas ascending i...

The disclosed reinforced laminate or composite board comprises external first and second continuous spaced sheets of fiber-reinforced synthetic resin, with the reinforcing fibers in each sheet oriented so as to provide reinforcement in two directions of stress. A supporting core is sandwiched between the first and second sheets. This supporting core is formed by a plurality of rib elements extending in directions different from the directions in which the reinforcing fibers of the first and seco...

The coating composition is prepared by partial co-hydrolysis and co-condensation of a mixture comprising an organotrialkoxysilane or its combination with a tetraalkoxysilane, a fluoroalkylalkoxysilane and a hydroxy-endblocked diorganopolysiloxane in the presence of an acid catalyst. The organopolysiloxanes thus prepared are suitable for coating plastic surfaces to produce a coating on the surfaces, the cured coating film having hardness as well as flexibility sufficient to ensure a very strong r...