Foam sheets of high compressive strength are produced by extruding a mixture of a styrene polymer and from 5 to 16 % by weight of a blowing agent mixture containing a) from 3 to 70 % by weight of an alcohol or ketone having a boiling point of from 56 to 100.degree.C, b) from 5 to 50 % by weight of carbon dioxide and c) from 0 to 90 % by weight of a saturated C3- to C5hydrocarbon and/or of a ...

METHOD FOR PRODUCING A CONCRETE PANEL PARTICULARLY FOR FACINGS PROTECTIVE AGAINST ATMOSPHERIC AGENTS, AND THE PANEL THUS PRODUCED. A method for producing a concrete panel resistant to atmospheric agents and consequently advantageously usable in the formation of protective facings. The panel is formed by using a concrete of low porosity which is subsequently impregnated with an organic monomer poly...

The invention is directed to improvements in foam type carpet cleaners and, more particularily, to the production of a relatively dry water-detergent mixture foam which is producted by applying drops of the mixture into an airstream duct in which is located a rotating propeller, or fan blade, driven by the airstream, the propeller contacting the drops and producing a fine droplet dispersion of the...

The apparatus (1) according to the invention for the conveying and exchanging of a pouring tube (2) which is attached to a movable plate (3) sliding on guide rails (9) which can transmit an upward thrust, comprises a rocker arm (20) actuating a lever (26) in a manner so as to impart to the movable plate (3) a rocking movement about a horizontal frontal ridge of the movable plate which is engaged i...

Process for the treatment of spent ground pot-linings by thermal shock in a reactor, the linings consisting at the same time of carbon-containing products and of silicoalumina products impregnated with inorganic fluorine compounds, as a mixture with a pulverulent mineral additive capable of combining when heated, with or without melting, with the impregnating fluorine compounds to form new stable ...

An impeller with semiaxial blading and a vertical axis of rotation is rotatably arranged in a well-shaped thrust housing. The drive for the impeller is inserted into the thrust housing from above through a cover plate, and the thrust housing is closed at the bottom by a base plate which has a water inlet, arranged concentrically in the centre, for the axial flow of water against the impeller and a...

A water-jet propulsion system for ships, which are intended to be used in shallow waters. A semi-axial, bladed turbine wheel with a vertical axis of rotation is disposed so that it can rotate in a well-shaped pressure housing. Into the pressure housing, the driving mechanism for the turbine wheel is introduced from above through a cover plate. At the lower end, the pressure housing is closed of...

A glass sheet heated close to a softening temperature is heat strengthened by cooling it at a certain controlled cooling rate. The cooling is effected in a space between cooling panels (9) and the cooling panels are cooled by a gas jet (8) which is applied to the surfaces of cooling panels (9) facing away from the glass sheet. A cooling space temperature measurement can be used for controlling the...

The invention relates to a method and apparatus for heat-strengthening glass sheets. A glass sheet heated close to a softening temperature is heat strengthened by cooling it at a certain controlled cooling rate. The cooling is effected in a space between cooling panels (9) and the cooling panels are cooled by a gas jet which is applied to the surfaces of cooling panels (9) facing away from the gla...

An automatic output power controller controls signals output by an amplifier amplifying a modulated wave with its envelope varying due to the modulation so that the mean power becomes constant. An equi-output point extraction means extracts timing of the output power of the amplifier becoming a constant value from a base band signal or the like, and supplies the timing to a sample-and-hold circui...

A device by which commodities emerging in single file from a supply unit are formed into groups and transferred to a wrapping machine includes feed belts, by which the single commodities are directed from the supply unit to a transfer station, a traversing system by which rows of the commodities are diverted repeatedly from the single file at right angles to the initial feed direction, a conveyor ...

Safety syringe of the type comprising a cylinder containing liquid which has a mounting for fixing the needle at one end and at the other end a zone which can be seized by the fingers and a piston which has a coupling at one end for a deformable sealing plug in the cylinder and at the other end a control plate characterized in that the piston has integral catch means engaging corresponding recesse...