Abstract: The present disclosure is directed to a nail driving apparatus having a percussive air hammer driving a chisel. The apparatus has a base member, having guide means upstanding from each side of the base member. A cradle means is movable along the guide means and means carried by the cradle means is adapted to mount the air hammer securely to said cradle means. A nail barrel means is carried by the base member into which both nails to be driven and the chisel of the air hammer is positioned on the base member to be received and one of the guide means upstanding from the base member forms a nail chute having means for delivering nails singly to the barrel means beneath the chisel when the air hammer and cradle is raised.

Abstract: The present disclosure is directed to an apparatus for removing or replacing a ships underwater propulsion shaft in a dry dock and transporting it from the ship to a work area. It has a mobile vehicular frame and a pair of spaced apart main cylinder ram lifts pivoted at their base to the vehicular frame, each lying beneath a primary and secondary shaft support for carrying the shaft to be removed. The shaft receiving and removing means is mounted at the upper ends of said main cylinder ram lifts. Auxiliary tilt cylinder and ram means each having one end pivoted to said vehicular frame and the other end pivotally connected to tilt the main cylinder and ram lifts toward and away from the ships part to be removed from or replaced on the ship.

Abstract: A two stroke diesel engine requiring a minimum of one pair of cylinders is constructable in multiple cylinder pairs. Each cylinder contains two oppositely working pistons. Four pistons drive, without rocking couples, opposite sides of a single crankshaft having three crankpins. Two paired cylinders are interconnected through and share a common precombustion chamber insuring cylinder pressure equalization and require only one fuel injector. The valveless engine has piston controlled intake and exhaust ports and crank phasing insures that exhaust ports are opened and closed prior to the respective opening and closing of the intake ports rendering the uniflow scavenged cylinders superchargeable. The precombustion chamber is optionally made variable in volume to simultaneously provide a variable compression ratio to both cylinders without affecting piston geometry or stroke.

Abstract: A method and device for cooling molds circulating in a horizontal plane, in which siphon action is used to pass cooling liquid from a top gutter through the molds. In this way the whole cooling system is becoming constructively simplified, such that production speeds can be increased, with the consequent greater length of the cooling system, but without its becoming unduly complicated. This effect is realized irrespective of the nature of the machine or the number of molds.Method and device are especially advantageous when applied with the manufacture of plastics tube, more particularly yet with the manufacture of plastic corrugated tube.

Abstract: The present system and apparatus for pumping an oil well damps out the stretch and over travel in sucker rod over travel particularly when the rod string approaches its point of reversal of direction either up or down. This is accomplished by decelerating the rate of travel of the rod string and at its end of travel pausing for a time period sufficient to allow rod string oscillations to damp out prior to reversal of rod string direction which due to the long length of the rod string, its weight and the weight of the trapped oil avoids breaking the rod string and the time loss occasioned thereby in both loss of well production and costly replacement of equipment and the time loss resulting therefrom.The present invention also achieves substantial recovery of hi-viscosity oil not recoverable at present by standard recovery procedures. This is accomplished with a sensor positioned to be actuated by the ram of the hydraulic drive.

Abstract: The present disclosure of a board bundle cradle is for use with the free end of a dip stick having a pivoted work carrier at its free end having a hook which has a horizontally rotatable work carrier movable through an arc of the order of 106.degree. horizontally relative to the pivot. The board road board bundle cradle has a pair of spaced apart end frames each of which has a base member adapted to receive and support a bundle of boards to be laid into a board road. A major and a minor board bundle containment member upstands from each end of each base member and extends from the upper portion of each major support member. Spacer means between the spaced apart end frames rigidly secures the frames together. The portion lying between the upwardly forwardly inclined member and the upper free end of the minor board bundle containment member defines the loading mouth of the cradle through which a bundle of boards to be laid are introduced to the base members of each end frame.

Abstract: A composite tube of a heat-sealable non-woven material comprises an inner and an outer tube of non-woven, each of said tubes being provided with a longitudinal seal obtained by ultrasonic sealing, the outer and inner tube being fixed with respect to each other by adhesive spots. The inner side of the inner non-woven tube is coated with a membrane for membrane filtration.The seal formed by ultrasonic sealing in the outer tube does not extend to the inner side of the inner tube and preferably the seals in the outer and inner tube are staggered with respect to each other.The composite tube is formed by first forming the inner tube, applying spots of an adhesive upon the outer side of the inner tube, and subsequently applying the outer tube onto the inner tube. During the step of forming the longitudinal seal by ultrasonic sealing in the outer tube it is avoided that the seal as formed extends toward the inner side of the inner tube.

Abstract: Voltage regulators of the waveform chopping type operable with alternating current sources are operated in a mode wherein a wave train complementary to the chopping wave train is provided with the property that each of the wave trains has equal amplitude and inverse polarity harmonics. Thus the two wave trains may be added together to cancel out all the noise introduced by the chopping. This is done by synchronously switching the respective wave trains in two corresponding processing channels leading to two respective power output channels, wherein one channel has incorporated therein amplitude regulation means, preferably of the feedback type. To remove the noise components, the higher frequency harmonics are isolated from the fundamental frequency which serves as the power supply medium, and then the equal amplitude and opposite sense harmonics are added together to cancel the noise components.

Abstract: Coloring composition for colouring polyvinylchloride comprising at least 40% by weight of coloring pigment and at most 60% by weight of glycerolmonostearate. The composition may be added directly to extruder for extruding polyvinylchloride, the amount of glycerolmonostearate in the moulded article as obtained being restricted to at most 5%.

Abstract: In a non-destructive method the state of ageing of plastic products is determined by means of infrared radiation, which is passed through the product.The invention is based upon the discovery that there is a clear relationship between certain physical and/or chemical changes occurring during the course of time in the interior of plastic materials, detectable by infrared analysis, and the mechanical properties of the product. On the basis of this relationship, the method may be used to decide whether products can be safely used or whether they must be disqualified and removed.The method is particularly well suited with crates which are to contain bottles; the radiation is then passed through a crate wall.Apparatus for performing the method may be arranged in a line such as a conveyor belt bottling line.

Abstract: A ring or article of decorative jewelry is provided that has multiple interchangeable decorative stones. The ring is made with a flexible hinged top piece securing large polished stones against a bezel upstanding from the ring. The stones securely gripped by the flexible spring action of the hinged lid and it is unnecessary that the stones themselves be placed in any form of intermediate mounting.

Abstract: An insulating pipe part of thermoplastic material comprises two opposite sections and one third section disposed at an angle with respect to the former sections, the wall portion of said sections being provided with a continuous wall cutting slit. The pipe part may comprise thicker parts of a polyurethan foam.For forming an insulated branch pipe joint, said insulating pipe part is pushed over a branch pipe and subsequently plastic sleeves with beveled front ends are heatshrunk on to said sections, thereby closing said slit in a moisture tight manner.In order to obtain a reliable moisture tight closing, the sleeves are provided with beveled front ends so that the lower sleeve ends overlap each other.

Abstract: The present disclosure is directed to a portable cutter particularly useful in trimming and shaping standing growing trees of the evergreen type which has a cutting head mounted on one end of a rod, and a pistol grip type control handle on the other end. A second handle is secured on the rod substantially midway between the control handle and cutting head. A back pack having partial waist encircling support means with a belt and a securing buckle is provided with a pair of spaced apart vertical standards secured to said encircling support having a transverse connector therebetween above said waist support. The back pack is retained on the operator by a pair of shoulder strap connector means attached to each end of center of said transverse connector and connectable to said waist support. Back pack extension and guide means is carried by and secured to at least one of the vertical standards.

Abstract: The present disclosure is directed to a mud metering tank monitoring system for use with an oil well drilling derrick having a sheave on the crown block and a bottom pulley forming a block and tackle arrangement with a cable supporting a traveling block adapted to be attached at one end to a pipe string for raising and lowering the string in a drill casing by a prime mover the other end of said cable being a dead line and having a weight indicator connected thereto. The tank has a mud pump and a fluid connection between the tank and the drill casing. Pipe string counting means is connected to be driven by the sheave in the crown block and to indicate pipe stands lowered into and removed from the drill casing only when a pipe string is being carried by the traveling block. A pair of vertically spaced apart mud sensors are positioned in the mud metering tank, and a computer panel is connected to receive input signals from the pipe string counters and mud sensors.

Abstract: A plastic pipe part 1 is pushed across a head part 3 of a sealing sleeve 4, being supported by a support 8, thereby providing the plastic pipe part with a widened end 7. Subsequently the widened end is surrounded by an outer mold 11 with three successive widenings 12, 14, 15 and by means of a fluid pressure in the interior of the widened end 7, sealed by the head part 3, the widened end is provided with three socket end widenings 28, 22, 29. After removal of the support 8 the end portion 6 of the socket end is inwardly rebent around the head part 3 thus forming a groove chamber 5 retaining the head part 3 of sealing sleeve 4. Pushing the plastic pipe part across the head part is facilitated by applying a fluid pressure.

Abstract: Method for uniting a plastic fixation part with a sealing body comprising a head end and a sealing sleeve, by first molding the sealing body and subsequently molding the plastic fixation part around the head end of the sealing body, thereby protecting the sealing sleeve. The fixation part is provided with corrugations for connecting said fixation part with a socket pipe provided with corrugations on its outer side.The method may be carried out in an apparatus comprising a first mold part, a second mold part and a third mold part forming together a molding space for forming the sealing body and a forth mold part replacing the first mold part, forms a molding space for molding the fixation part.

Abstract: The invention relates to a coupler for insulated plastic pipe ends and a branch pipe end, the insulation being covered with tubular casings. The coupler is provided with anchoring means comprising one or more ribs or cams extending laterally from the central coupler 1 and with means for transmitting pressure forces from the anchoring means and the central coupler to the tubular casings.

Abstract: A device and method for recovering heat from the soil and groundwater, comprise heat-exchanging means consisting of an inner tube, an outer tube and partitions forming longitudinal channels between said inner and outer tube.An inlet for heat-exchanging fluid and an outlet for heat-exchanging fluid are present for conveying a heat-exchanging fluid through said longitudinal channels.The heat-exchanging means are preferably placed in a perforated casing allowing passage of liquid but not of soil particles. The casing consists preferably of an outer casing tube and an inner casing tube, casing partitions providing longitudinal casing channels. For allowing passage of groundwater the outer casing tube and the inner casing tube are provided with perforations.Heat is recovered by passing a heat-exchanging fluid through the casing channels.

Abstract: A plastic crate or tray comprises a bottom and vertical side walls. A side wall comprises inner and outer side wall parts.Injection molding points are present in the lower edge of the outer side wall parts.

Abstract: Apparatus for making profiled plastic tube and comprising two circulating endless chains, each making a plurality of mold halves move along with a tube coming from an extruder, these mold halves pairwise constituting a mold cavity in which the tube is being given its profile. According to the invention the molds are movable relative to the chain links in a direction perpendicular to the direction of movement of the links. The machine frame is provided with guides for the mold halves, some located interiorly, others exteriorly, with respect to the chain loop, such that once closed, the cavity formed by the pairs of mold halves will remain closed and undisturbed up to the end.Preferably the transitions between curved portions and the operative portion of the path of the mold halves at the entrance and the exit ends are bending points of mathematically calculated paths and the operative straight path tangentially joins said transitional portions.