An automatic tractor guidance system for controlling the steering of a tractor to follow a previously plowed furrow is disclosed. A furrow follower is provided with a sensor for sensing the direction of the path relative to the direction of travel of the tractor. The steering direction of the tractor is likewise sensed. The two sensor signals are combined and compared to a convergence frequency si...

PCT No. PCT/DE80/00014 Sec. 371 Date Oct. 21, 1980 Sec. 102(e) Date Oct. 21, 1980 PCT Filed Feb. 8, 1980 PCT Pub. No. WO80/01760 PCT Pub. Date Sep. 4, 1980.A ski stop is associated with a heel tightener for safety ski bindings that comprises a boot heel-supporting turntable to which there are pivotably secured two pull members, one passing each side of the boot heel, which carry a sole retainer mo...

Hospital mattresses are generally made of foam plastic having predominantly open cell cores and are in the form of a parallel-epipedic block (1) which is provided with a protective layer (12 and 13) consisting of a plastic film which is easy to clean so that injurious substances and bacteria can be removed. Such mattresses have the drawback, however, that when used they produce sounds which are di...

Hospital mattresses are generally made of foam plastic having predominantly open cell cores and are in the form of a parallel-epipedic block (1) which is provided with a protective layer (12 and 13) consisting of a plastic film which is easy to clean so that injurious substances and bacteria can be removed. Such mattresses have the drawback, however, that when used they produce sounds which are di...

Hospital mattresses are generally made of foam plastic having predominantly open cell cores and are in the form of a parallel-epipedic block (1) which is provided with a protective layer (12 and 13) consisting of a plastic film which is easy to clean so that injurious substances and bacteria can be removed. Such mattresses have the drawback, however, that when used they produce sounds which are di...

Hospital mattresses are generally made of foam plastic having predominantly open cell cores and are in the form of a parallel-epipedic block (1) which is provided with a protective layer (12 and 13) consisting of a plastic film which is easy to clean so that injurious substances and bacteria can be removed. Such mattresses have the drawback, however, that when used they produce sounds which are di...

Hospital mattresses are generally made of foam plastic having predominantly open cell cores and are in the form of a parallel-epipedic block (1) which is provided with a protective layer (12 and 13) consisting of a plastic film which is easy to clean so that injurious substances and bacteria can be removed. Such mattresses have the drawback, however, that when used they produce sounds which are di...

A METHOD OF PRODUCING LIGHT GAGE METALLIC STRIP MATERIAL An improved method of producing a coil of light gage metallic strip material is disclosed comprising the steps of compressing a metal powder mixture into a cylindrical billet having homogeneous structure, grain size and chemical composition, rotating the billet about its longitudinal axis, and peeling a continuous light gage layer from the e...

An air-sparged hydrocyclone apparatus and method, the apparatus including a substantially hollow, cyclone body having a cylindrical section and a downwardly oriented conical section. An inlet, an overflow and an underflow are also provided in the cyclone body. At least a portion of the wall of the cyclone body is modified to include an air-sparging section wherein air, under pressure, is forced in...

SMOKE SUPPRESSED RIGID POLYURETHANE FOAM of the Invention Smoke suppressed rigid polyurethane foams are prepared from a reaction mixture comprising as the smoke suppressant additive a metal salt of a: dialkyl dithiocarbamate, a mercaptobenzothiazole a 2,5-dimercapto-1,3,4-thiadiazole, a mercaptotriazine a hydroxy thiophenol or an aliphatic dimercapto compound of 2 to 10 carbons.

An improved pressure/temperature probe whose accuracy will not be affected by the pressures and temperatures to which it is subject or by the resistance of the connecting cables. The probe includes a separate pressure transducer and temperature transducer which are connected in series to a constant current source. In addition to the pressure reading taken by the pressure probe, a temperature readi...

This invention relates to a method for manufacturing a granular organic rubber composition which is useful for a vulcanizing agent, a vulcanization accelerator and antioxidant etc. by contacting an organic rubber chemical mixture comprising a rubber chemical, a liquid polybutene, a nonionic or anionic surface active agent and a water-soluble anionic macromolecule with an aqueous solution containin...

A biaxially oriented polypropylene film is provided which exhibits improved heat-seal strength and good optical clarity. The polypropylene film is characterized by having on at least one surface thereof a continuous coating of a heat-sealable film layer comprising a copolymer of ethylene and methylacrylate. The lamination may be formed by machine direction orientation of an uncoated polypropylene ...

In producing a crosslinked polypropylene foam, 0.5 to 4 parts by weight of a compound selected from triacrylate and trimethacrylate of aliphatic polyhydric alcohol and a blowing agent are mixed with 100 parts by weight of propylene homopolymer or copolymer. Then, the mixture is shaped under heat, followed by irradiation with an ionizing radiation such that the dose of the radiation absorbed by the...

This development is concerned with an improved process of preparing polycarbonate molding compositions and molded articles having superior hydrolysis resistance, stress crack resistance and flame retardancy, by thermoplastically processing a partially crosslinked aromatic polycarbonate. A crosslinkable aromatic thermoplastic polycarbonate is subject to irradiation to cause crosslinking on its surf...

A foamed article of poly-n-butyl methacrylate or a copolymer of n-butyl methacrylate and other vinyl monomer is obtained by allowing n-butyl methacrylate alone or n-butyl methacrylate in conjunction with the other vinyl monomer to stand at room temperature under a vacuum.

Combustibility properties of flexible polyurethane foams made with flame retardant additives are increased by incorporating into the foam-forming reaction mixture a combination of certain flame retardant surfactants and certain low molecular weight polyols.

High density structural ("blocking") materials composed of a polyimide filled with glass microballoons. Structural components such as panels which have integral edgings and/or other parts made of the high density materials.

Rust preventing synthetic resin compositions to be added to cement or mortar, which have high strength, adhesion and waterproof, contain 0.05 DIFFERENCE 5 parts by weight of a primary alkanol-amine having 2 to 8 carbon atoms based on 100 parts by weight of resin solid content in a synthetic resin emulsion.