Abstract: A blasting composition of high solids content, usually of plastic solid consistency, is composed of 60 to 90 parts by weight of solid particulate oxidizer salt, which is mainly ammonium nitrate, preferably fertilizer grade prills, and 10 to 40% of liquid slurry partially filling the interstices and voids in and between the solid particles. The slurry is one that will not appreciably dissolve or soften the granules, hence it is preferably a substantially saturated and thickened solution, in non-aqueous solvent, of strong oxidizer salt, typically ammonium and/or calcium nitrate to which sodium nitrate may be added. The preferred solvent is a low molecular weight polar organic liquid, selected from the group consisting of methanol, ethylene glycol, formamide and ethanol. In some cases isopropanol or propylene glycol may be included.
Abstract: Apparatus and method are disclosed for presenting information over a display area, using a group of contiguous or substantially adjoining modules which essentially cover the area. Each module is made up of contiguously arranged elements, capable of presenting alternatively either a luminous (highly visible) or a non-luminous (much less visible) aspect. By selectively operating or energizing chosen elements in groups within each module, characters or symbols are presented which, collectively over the group of modules, presents the information to be displayed. Each module comprises a mounting base and an associated printed circuit board, referred to as a satellite board, having conductive element connected to each element of the module so that each element may be activated or energized, or deactivated selectively. The modules, in turn, are mounted so that the satellite board is connected electrically to a higher order control master or major printed circuit board.
Abstract: Apparatus is disclosed for transporting heavy equipment such as welding current generators, a prime mover therefor, and associated devices or supplies, on and along a pipeline, the pipeline serving as a monorail. The apparatus, of elongated construction along the pipeline, is supported at one end and propelled along the line by power driven traction means engaging the top part of the pipeline. The opposite end of the apparatus is supported on a pair of laterally spaced swivel mounted wheels which engage the sides of the pipeline laterally away from and somewhat below the top of the line. The latter wheels give lateral support and stability to maintain the apparatus in a substantially upright position on the pipeline. Sensing means, such as a pendulum, mercury switch means, or equivalent, detect incipient tilting or motion towards instability and are used to steer the swivel mounted wheels, either directly or indirectly.
Abstract: Signals which contain components that vary with the lateral position of an electric welding instrument as it travels along a weld path between opposite work pieces are obtained from the arc or other heat source and are first processed to remove confusing or nonsignificant components. The processed signals are then compared or combined with each other, or with other signals of predetermined value, to obtain outputs which can be used to determine or control the lateral position or movement of the welding instrument along the weld path. Specifically, in electric arc welding of metals, signals from an electrical characteristic at the arc, such as arc current, which include a component indicative of lateral position of the welding instrument with respect to one or more sidewalls, are first filtered and processed to remove undesirable components.
July 6, 1976
Date of Patent:
April 24, 1979
CRC-Crose, International, Inc.
Cherie E. Kushner, Paul A. Tews, Jerome W. Nelson
Abstract: Process and apparatus are disclosed in which a very cold gas, e.g. air, is injected into an upflowing stream of water to aerate and help lift the liquid at accelerated velocity. The gas-liquid mixture is discharged at high velocity into a separating zone converting dynamic energy into pressure energy; gas flows out to drive an expansion engine while the liquid next flows to a deep storage zone, entrapping gas as it descends at considerable velocity. The expanding gas is cooled by expansion and returned to the first stage. Meanwhile, the entrapped downflowing gas is allowed to collect above the liquid in deep storage under pressure, from whence it can be released for expansion, as in an engine, with further cooling to lower still further the temperature of the gas going to the first step. In a modification, a very cold gas, such as liquid nitrogen, may be used in the first step, means being provided for obtaining work and reliquefying the latter gas.
Abstract: The disclosed invention includes apparatus and method for full wave rectification of commerical alternating current of conventional or standard low frequency (e.g., 50-60 hz.) and for generating substantially square wave pulses of high frequency for transformation to voltage suitable for illumination of gas discharge lamps. The apparatus includes electronic means for rectification and silicone control rectifiers and stearing diodes, plus RC devices, for setting up a primary wave or pulse oscillation to produce a desired form of wave pulses at a suitable high frequency. Apparatus also includes variable potentiometer means for varying the lighting intensity by changing width or duty cycle of power pulses as applied to the primary of the light-operating transformer without substantially changing their frequency. Means which can be on or off also are included to periodically turn off the transformer power for "flashing" or periodic lighting and extinguishing of the lamps when such operation is needed.
Abstract: Apparatus and method for welding girth joints in pipelines and similar structures, of the general type described and claimed in U.S. Pat. No. 3,806,694, is improved by adding to the normal or conventional head, on its frame, a second or supplemental welding head with its own independent wire electrode, electric power and shielding gas supply. The second head is mounted on an adjustable support for accommodating work pieces of different radius or for varying arc positions. Oscillating means for spreading the molten metal across the width of the joint, as normally provided for the single welding head in the patent mentioned, are adapted to operate the second head as well and to vary its amplitude of movement. Separate means are provided for adjusting the spacing between each head and the work and also for lateral adjustment to align the heads with the plane of the joint. By these means, the number of stations required for a multiple pass operation, on thick wall pipe, for example, may be reduced.
Abstract: A bandage for protecting an injury to the palm of the hand, especially the concave part of the palm, comprises an outer adhesively coated sheet having a central area to which a gauze pad is affixed to cover the wound, and symmetrically arranged branches, also adhesively coated, for securing the bandage in place securely in a manner to permit maximum use of the hand while making sure the pad stays in place in the hollow of the palm. Radially extending arms, symmetrically arranged, are provided respectively to attach to the base of the hand or wrist and to extend between the third and fourth fingers; other arms or branches extend around the base of the thumb and around the opposite side of the hand, still others are selectively attachable to index or little fingers (depending on which hand, right or left, is being bandaged) and further arms are designed to wrap around either between thumb and forefinger or around the hand under or near the little finger knuckle.
Abstract: A simple dewatering system comprises hollow expandable bore-plugging body which can be set in place and locked there in the borehole, at any desired level, by simply pumping compressed air into it. An orifice of calculated size in the bottom of the body allows compressed air to escape and build up pressure below to raise the water in the lower part of the hole to the ground surface through a conduit which extends from the borehole bottom to a level above the ground. The orifice, which may be adjustable, maintains a predetermined minimum pressure differential inside the body which pressure is enough higher than the water-expelling pressure below to keep the body tightly inflated so it cannot slide upwardly. Compressed air escapes continuously through the orifice so that outflow of water from the borehole bottom is continuous until the water level reaches the bottom of the outflow conduit, when the conduit is blown clear, preventing run-back of the water in the conduit.