Abstract: Improved tube bundle-type heat exchanger comprising at least one tube base cast from a plastic material, such as poly laurin lactam, with a tube bundle cast in the tube base. Several optional features are also disclosed.

Abstract: Single-step, pressureless process for preparing dimethylhydrogenchlorosilane (DMS.dbd.(CH.sub.3).sub.2 HSiCl) with a content of at least 97% by weight, the product being free of unsaturated hydrocarbons, by adding hexachloroplatinic acid in a catalytic amount to the first-run mixture of the direct synthesis of methylchlorosilanes, distilling between 33 and 37.degree. C., the addition of the acid taking place before fractionation is carried out. The so obtained DMS is used for the modification of silicone products, particularly to improve specific parameters, as for instance, resistance to reversion, oil resistance and flame resistance.

Abstract: Switching valves, e.g. for a closed-type molding apparatus for manufacturing polyurethane elastomers and the like, comprising a valve body having a plurality of openings, preferably five, serving as inlet and outlet ports, and a preferably rotatable valve sleeve which serves for switching the openings without any danger of introducing any other material into the switching valve system. Connections are made between pairs of adjacent openings, one of them being cut off from communication.

Abstract: Adjustable boot - ski interface mechanisms for providing elevational adjustment of a skier's boot with respect to the ski and with respect to a separate, extraneous, releasable binding that is fixed to the ski, wherein the binding exerts a predetermined retaining force before releasing the boot from the ski upon occurrence of an external separating force when the skier encounters an obstacle which results in the latter force. The binding includes at least one of a front and a rear rest mechanism, secured to the ski for cooperation with at least one respective interface portion of the boot.

Abstract: In a circuit arrangement for providing a periodic saw-tooth current in a coil, e.g. a kinescope deflector coil, comprising a one-way conducting device that connects the coil to a voltage source, and a controllable switching device having a control electrode connectable to a periodic pilot-pulse source that makes the switching device conductive during part of the saw-tooth cycle, the switching device being connectable to a current source through an induction coil, including a capacitor that is charged by the current source by means of the induction coil when the switching device is not conductive, the improvement wherein the capacitor is connected to the primary winding of a transformer, the secondary winding of the latter being connected to the one-way conducting device, and wherein the time during which the switching device conducts and the capacitor discharges are longer than the return time of the saw-tooth cycle.

Abstract: This invention relates to a material mixing apparatus for use, for example, in the preparation of polyurethane elastomers, wherein a mixer chamber, a set of switching valves and pipelines are maintained to ensure a constantly flowing state for the materials, the apparatus being featured in that it allows to remove the mixed materials in any amount at any time yet preventing contamination of the work site, as a result of a preferably totally closed structure. Two exemplary embodiments are disclosed, having at least two material tanks and switching means, as well as an additional switching means which can serve for a liquid rinsing agent or for a mixture of the materials.

Abstract: Milling cutter head for making arcuate toothing, comprising a substantially disk-shaped carrier body that is surrounded by a locking ring, the body having therein one or more pairs of grooves of a stepped cross-section, for receiving a corresponding number of pairs of removable, axial milling cutters, in each pair one being an inner and one an outer cutter. These cutters have head cutting and flank cutting edges, and optionally head and flank clearance surfaces. The head cutting edges are made of overlap partially; the cutting edges are formed at intersecting points between the clearance surfaces. Both kinds of cutters have cylindrical body surfaces that include chip bearing surfaces and associated limiting surfaces, as well as optional supporting surfaces. The inclination angle defined between the chip bearing and the limiting surfaces is smaller than 90.degree.. The cutters are preferably rod-shaped and have quadrilateral cross-sections.

Abstract: A casting head for cooperation with a mold in which hardenable synthetic resins can be cast under a high temperature, comprising: a stationary and a respectively movable head part; at least one hydraulic cylinder in the stationary head part to change the relative position of a portion of the movable part, between a closed rest position and a casting position, in which latter a passage of the casting head is open to feed the resin to an inlet opening of the mold; the movable head part includes a housing with bottom and top parts; at least one toggle lever is slidably journaled and pivotable in the bottom housing part while the movable head part has therein a lengthwise movable closure rod, the outer end of the latter carrying a closure head which acts on the passage to open and close the same; and spring means for closing the passage when the pressure applied to the cylinder has been released, the spring means being compressed by way of the closure rod and the closure head when the passage is being opened.

Abstract: A tool-holder chuck for receiving therein a tool holder provided with various tools such as end mills or drills, etc., e.g. in a milling machine, which chuck can be changed easily when necessary, comprising a clamp including a nut which is threaded to a chuck body, a clamp ring which can move only in the coaxial direction against the body, and a plurality of rolling members that transmit at least the coaxial movement of the nut to the clamp ring when it is screwed in, projections on the tool holder being pressed inward by the coaxial movement of the clamp ring as a result of screwing of the nut, and a taper spindle of the holder, that interlocks with a tapered bore of the chuck body. In this way direct sliding friction against the projections is eliminated, and the tool holder can be clamped tightly, with relatively small screwing force of the nut, utilizing the sliding friction between the nut and the clamp ring.

Abstract: Process for preparing 2-(cyclohexenyl-4-)ethyl-silicon compounds from Si compounds containing SiH groups by reacting the latter compounds with vinylcyclohexene-4 in the presence of H.sub.2 PtCl.sub.6 as addition catalyst at normal pressure and temperatures ranging from 20.degree. to 200.degree. C. The invention also includes novel compounds made by the process. The compounds impart excellent air-drying properties to silicone varnishes and are useful additives in the plastics and casting industries.

Abstract: Boot or footwear sole structures and assemblies adaptable to various conditions where components are fixed to the sole between the heel and the toe portions of the boot by the forced interaction of opposed bearing surfaces on the components, with supporting areas or bearing profiles formed in the sole on respective sides of an opening that is provided between the heel and toe portions. The components stiffen the sole when assembled, and in addition portions thereof can be specially adapted for particular uses, such as climbing spikes, ice crampons, skates or ski bindings, thereby giving the boot sole structures varied adaptability and interchangeability to various modes of activities.

Abstract: Articulated handlebars for bicycles, motorcycles and the like, which have conventional support means thereon for handlebars, comprising elongated, substantially horizontal attaching means with a clamp or a pair thereof for removably fixing the attaching means to the support means; at least one supporting means, mostly vertical, at an angle to the attaching means; one or a pair of handle shaft means associated with the supporting means, for carrying at its or their outer end(s) one or a pair of handles; and respective securing means for attaching the supporting means to selected portions of the attaching means, and the handle shaft means to selected portions of the supporting means, respectively; whereby any spatial, height, length and angular attitude can be set for the handle(s), as required by the operator of the bicycle, motorcycle and the like. Various exemplary embodiments and structural solutions are disclosed.

Abstract: Individually and combined, in a device for wrapping pre-cut dough sheets around a mixture of minced vegetables, meat and the like, to make rolled food: a device for supplying the mixture to the dough sheets; a device for doubling the filled dough sheets; and a device for folding over the filled and doubled dough sheets.The invention also relates to other food processing devices, cooperating with the device for wrapping the dough sheet around the food mixture.

Abstract: Waste-gas suppressor for internal-combustion engines, utilizing negative pressure generated in the carburetor of the engine. A water regulator operated by the negative pressure adjusts water flow in proportion to engine speed, the water being evaporated by the exhaust heat of the engine. The resulting steam is supplied to an air cleaner, and the cleaned air containing the steam is supplied to the combustion chamber of the engine.

Abstract: Lubricant dosing device for double-action, two-conduit central lubricating systems, wherein a housing has therein two piston chambers, an outlet control chamber, two inlets for a pressurized lubricant, and two outlets for predetermined dosed amounts of the lubricant. One chamber is for a control piston and the other for a dosing piston; the longitudinal axes of all three chambers preferably pass through corners of an imaginary triangle perpendicular to the main axis of the housing.