Abstract: It is known to harden foundry cores by admixing a polymerizable material therewith and then curing by addition of a catalyst. Means are provided for injecting gaseous catalysts and compressed air, sequentially, into the die which contains the admixture of polymerizable material and foundry core material. In accordance with the invention, the gaseous catalyst and compressed air respectively, are injected into the die containing the mixture of foundry material in measured desired amounts and very rapidly.

Abstract: A fluid mixing device for, for example, mixing of the pigment carrier and the hardener of a two-component paint, comprising a mixing chamber and a resilient membrane dividing the mixing chamber into two compartments. The compartments have separate inlets and a common outlet, the common outlet being arranged so as to continuously communicate with one of the compartments but to be open toward the separate inlets only when the membrane is pressed off a seat surrounding the outlet. The membrane, which is formed with a central opening for maintaining the continuous communication between the outlet and one of the compartments, is preloaded toward its seat so as to break the communication between the outlet and the other of the compartments as the ratio between the fluid pressures in the compartments is below a certain level. The mixing device may be incorporated in the handle of a spray gun, wherein a mixing tube is connected at its outlet to accomplish a final mixing.

Abstract: A mechanism and method for supporting a tuning fork-type quartz crystal element which is arranged to fix the common connecting section of a pair of arms of the subject quartz crystal element having a substantially U-shape directly to a base member supporting the element by a particular adhesive agent having an acoustic impedance different from that of the quartz crystal element, thereby preventing a mechanical vibration energy from being transmitted during vibration of the quartz crystal element to the base member and supporting the quartz crystal element with the greatest possible stability and strength on the base member against external mechanical vibrations and shocks.

Abstract: Electrochemical device for producing very pure oxygen. The device contains at least one electrochemical cell comprising an anode compartment and a cathode compartment separated by a semi-permeable membrane. The apparatus also includes an oxidation reactor chamber wherein air oxidizes the reduced form of a compound to form a peroxide capable of spontaneously decomposing into water and into the oxidized form of said compound. A portion of said decomposed peroxide is fed to the anode compartment and another portion to the cathode compartment. Oxygen is formed at the anode by electrolysis of water. The cathode reduces the oxidized form of said compound. Oxygen is removed from the anode compartment products. The remaining products of the anode compartment and the cathode compartment are returned to the oxidation reactor chamber.

Abstract: A tree cutting device comprises two opposed curved knife blades, each defining a portion of a surface of revolution. Swingable arms for the curved knife blades are journalled on separate shafts which are arranged with their axes in a common plane inclined relative to the center line of the trees to be cut. The separate shafts are arranged at an angle to each other so that their axes intersect at a point between the journalling means for the arms and the intersection between the common plane for the axes of the shafts and the center line of the maximum diameter tree to be cut. Preferably, each knife blade defines a portion of a sphere. To assure proper guidance of the knives, the knife edge of each blade is located unsymmetrically relative to the thickness of the blade.

Abstract: An orthodontic appliance, such as a plate, has means defining at least one opening therein, and an elongated wire-type member is provided having at least one end which is removably insertable in the opening of the first member. The elongated member has engaging means at an end thereof which resiliently deforms to lockingly and non-rotatably engage an inner surface portion of the opening which has means for releasably engaging the engaging means of the elongated member.

Abstract: To mount control switches for convenient operation by the operator of motor vehicles, a cantilevered, free standing multi-faceted elongated hollow box like structure is secured to the steering post housing so that it is located between the steering wheel and the dashboard, spaced from the dashboard. A plurality of touch-sensitive switches are located on the surfaces of the structure defined by the facets thereof. The structure includes printed, or integrated circuits to which the switches are connected which, in turn, are attached to a cable which is separably connected to the cabling of the vehicle.

Abstract: A main raw material powder comprising cobalt oxide powder, chromium oxide powder and carbon powder is added with at least one metal oxide powder selected from the group consisting of manganese oxide powder, vanadium oxide powder, titanium oxide powder, tantalum oxide powder, niobium oxide powder, boron oxide powder, hafnium oxide powder, tungsten oxide powder, molybdenum oxide powder, iron oxide powder, nickel oxide powder and copper oxide powder; these powders are then mixed and pulverized to prepare a mixed powder; said mixed powder is then reduced by heating under vacuum or in a reducing atmosphere to obtain a reduced sponge-like mass; said sponge-like mass is finely pulverized, thereby manufacturing a cobalt-base reduced powder.A cobalt-base sintered alloy, produced by using said cobalt-base reduced powder thus manufactured as the material powder, has a relatively wide range of diffusion sintering temperatures applicable at the time of sintering thereof and has furthermore a high sintered density.

Abstract: The cylindrical peripheral wall (5) of a rotating hollow body mounted on a haft (1) driven by an electric motor within the stem casing of an X-ray tube is cooled with water supplied and removed respectively through co-axial ducts in the drive shaft, distributed by radial ducts in one end face of the rotary body to a ring duct and gathered from a ring duct at the other end face through another set of radial ducts leading back to the shaft. Between the two ring ducts the cooling medium flows through helical cooling ducts running parallel to each other and at an angle of about 15.degree. to the edge boundaries of the cylindrical operating surface. These ducts are formed on the outside by the anode peripheral wall material itself and on the inside by a stainless steel insert. The anode is degassed when its structure is soldered or brazed together in high vacuum at 1000.degree. C.

Abstract: Between 0.001 and 0.5% by weight of polytetrafluoroethylene powder is incorporated in the composite electrochemically active mass carried on the lead plates of a lead-acid storage battery. In the case of the positive electrodes, the result is to lengthen the service life in terms of cycles of charging and discharging. In the case of the negative electrodes, the effect is to raise the low-current yield and the low-temperature high-current yield. The density of the composite mass is reduced and its water-holding properties increased.

Abstract: A turbomolecular pump coaxial with the drive shaftof a rotary anode in an ray tube is provided between the radial seal of the drive shaft and the high vacuum space surrounding the rotary anode. A pot-shaped shell mounted on the drive shaft where the latter passes through its bottom carries the rotor vanes, while the stator vanes are fixed on the tube casing. In order that the anode may be driven with the built-in electric motor located within the tube casing between the drive shaft bearings, at the high speed desirable for the turbomolecular pump, the rotary anode is cooled by water flowing through a set of closely adjacent helical ducts just inside of the working anode surface, running at a pitch of 10.degree. to 15.degree., fed with cooling liquid from radial ducts and a ring duct along one end face of a rotary anode and drained by another ring duct and another set of radial ducts along the other face of the rotary anode.

Abstract: To provide for gradual turn-off of an ignition coil current control transistor, a control capacitor which provides turn-off current has its charge state changed gradually by means of an auxiliary transistor so connected to the capacitor that the conduction of the emitter-collector path of the auxiliary transistor is gradually changed, the main switching transistor being connected to and controlled by the auxiliary transistor and likewise changing gradually from conductive to blocking state in dependence on the gradual change in conduction of the emitter-collector path of the auxiliary transistor to prevent rapid turn-off of the main switching transistor and hence an undesired pulse at the secondary of the ignition coil which may induce continued operation of the internal combustion engine even though the ignition has been turned off.

Abstract: The device includes a fixed separating member with two mutually parallel thread guide plates spaced from one another and a cutting body movable toward the fixed member and operable by a textile machine. The cutting body includes two clamping shanks, which in the course of a cutting motion slide against the outer surfaces of the guide plates with a predetermined contact pressure in order to tension a thread guided crosswise over the guide plates. The cutting body also includes a blade so arranged between and parallel to the clamping shanks that in the direction of the cutting motion its cutting edge lies behind the clamping edges of the clamping shanks.

Abstract: A STIFF POSITIVE FEEDBACK TO THE VOLTAGE REGULATOR TAP AT WHICH THE Zener diode in circuit with the control transistor of the regulator is called into play accelerates the switching operation at the operating thresholds of the regulator, while a negative feedback from the same regulator terminal, with inversion produced by a transistor, is applied to a second tap of the voltage divider farther from ground, where its effect is delayed by a capacitor that also serves to filter the command voltage applied to the regulator. The transistor that inverts the feedback acts as a controlled current source drawing current from the second voltage tap. The circuit is highly compatible with production by integrated circuit technology.

Abstract: To permit, selectively, either continuous application of printing ink to axially oscillating inking distribution rollers of an offset printing machine, or intermittent ink supply by means of a ductor roller, an ink supply roller 6 is driven at a speed matched to the speed of a printing cylinder 13, the ink roller 6 being in continuous contact with a next adjacent roller 8 of the ink train forming the inking system.

Abstract: Suction-pulling devices for engaging the underside of a lifted top sheet of a stack of sheet material are carried on short carrier pieces inwardly extending from the respective front ends of two swing rods suspended above the stack near its sides. The swing rods are suspended on two crank arms, the most rearward of which is continuously driven to cause the front ends of these rods to describe an oval path in the vertical plane. The upper part of this path, which provides the forward motion, matches the speed of a suction lifter for the top sheet in a rear path portion and matches the linear speed of the drive rolls of a succeeding transport device in a forward portion. The suction-pullers are rotatable about a horizontal axis to fit the lay of the sheet being transferred and a control cam on a bearing of the rear supporting crank arm also produces a slight outward pull of the suction lifters during the forward motion to stretch the front edge of the sheet.

Abstract: Bottom parts, overlapping on a longitudinal median strip and connected at bending lines with the long sidewalls of a folding box, are attached to the short sidewalls by connection flaps which have triangular ears glued to the adjacent short sidewall halves. The triangular adhering ears are bounded by 45.degree. fold lines from the remainder of the connecting flap. The lower bottom part has a shallow oblique cutout at each end with its apex on the folding line between it and the connecting flap, so that the upper bottom part will ride on it easily as the box is set up while blunt corners on the leading edge of the oblique cut-out press in to provide snap action as the box is set up by inward pressure on the short sidewalls. In the folded condition, the sidewalls are folded together along the midline of the narrow walls. The two bottom parts are fastened together by a sticking strip edge along the middle. The lower bottom part bends on a folding line at the edge of this strip as the box is set up.

Abstract: A hard compact material, such as rock, is broken by directing a high velocity jet of fluid, such as water, into a drill hole in the material to be broken. The jet is generated by a nozzle and is directed into the drill hole through a tubular member, which is associated with the nozzle. Upon having traversed the tubular member, the jet is suddenly arrested in the hole to break the material by the established jet stagnation pressure stemmed by the tubular member.

Abstract: The present invention provides low-current carrying rem-reed switch contacts, preferably for operation under vacuum or under a protective gas. The contacts comprise a medium-hard magnetic material substrate which may contain anomalies on the surface. These are covered by an intermediate layer from 1 to 20 .mu.m of at least one metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium and tantalum. This intermediate layer is then covered with a noble metal layer, for example alloys of gold or silver, and preferably by ruthenium.

Abstract: Improved process for preparing methyltin chlorides through direct reaction of methyl chloride with metallic tin wherein the reaction is effected in a high-boiling hydrocarbon solvent in the presence of a glycol and iodine or an iodine compound as a reaction accelerator.