Abstract: A collapsible catwalk comprising a support frame having a base and a top section, trolley members mounted on the frame top section adapted to suspend the support frame for lateral linear travel on at least one horizontal support rail, at least one guide wheel extending rearwardly from the support frame for maintaining the support frame vertical and for facilitating and guiding the support frame during lateral linear travel, a platform pivotally mounted on the support frame at the base thereof for pivotal movement from a substantially vertical retracted position to a substantially horizontal extended forward position, and collapsible safety rails surrounding the platform pivotally mounted on the platform for collapse upon retraction of the platform and for erection upon extension of the platform. The collapsible catwalk may additionally comprise a brake extending rearwardly from the platform for stopping the lateral movement of the catwalk when the platform is mentioned to its horizontal position.

Abstract: A method and apparatus for shot blast cleaning a workpiece. The method comprising the steps of applying a composite stream of a slurry consisting of carrier liquid and particulate abrasive material under high velocity to the workpiece in a blast cabinet, reclaiming spent slurry after undersized abrasive material have been removed, cleaning the carrier liquid for reuse and pumping the cleaned carrier liquid at the workpiece for washing and conditioning the workpiece or pumping the cleaned carrier liquid together with the reclaimed abrasive material as a composite stream at the workpiece. A nozzle which has a divider within it for separating the abrasive material and carrier liquid is used in combination with a slurry discharge head to discharge the abrasive material and carrier liquid in a substantially overlapping blast pattern.

Abstract: An electric power generator has a housing having an inner cavity having a center and an inner circumferential surface spaced at a varying radial extent from the center. A magnetic flux generator has a body offset from a point of rotation. The magnetic flux generator is rotatable at the center. The magnetic flux generator has a central passageway for slidably receiving a shaft with a magnet. The magnetic flux generator has a coil mounted about the central passageway in an inductive relation with the magnet. A spring is disposed between the shaft and magnetic flux generator for urging the shaft into contact with the inner circumferential surface whereby as the housing rotates, the magnetic flux generator rotates relative to the housing urging the shaft to travel along the inner circumferential surface causing relative back and forth motion of the shaft through the passageway inducing a voltage in the coil.

Abstract: A sealing ring for fitting between and sealing an annular space between a spigot end of a length of pipe and a bell-shaped end of another length of pipe which are slid into each other to form a pipe joint. The sealing ring comprises an annular main body having a first surface for engaging the spigot end and a second surface for engaging the bell-shaped end during the formation of the pipe joint. A thin rupturable membrane of a thickness less than 0.008 inches is attached to the second surface about the circumference of the annular main body defining an annular cavity. A lubricant is disposed in the annular cavity, either between the second surface and the rupturable membrane or in an encapsulated cavity formed by the membrane whereby, when the spigot end and the bell-shaped end are slid into each other to form a pipe joint, the rupturable membrane is ruptured and the lubricant is released.

Abstract: A wire stringing device which comprises a barrel having a cylindrical bore which is closed at one end and open at the other end, a handle depending from said barrel, a compression spring disposed within the bore in proximity to the closed end, a projectile insertable into the bore whereby when the projectile is within the bore the spring is compressed against the closed end of the bore, the projectile adapted for attaching a flexible line thereto, a trigger adapted for engaging the projectile and maintaining the projectile within the bore and for releasing the projectile in response to finger pressure, whereby the projectile and the flexible wire may be projected from the device, and an adjustable compression member axially movable within the bore adjacent the closed end of the bore for adjusting the compression of the spring. The device may comprise a safety latch for locking the projectile in the barrel.

Abstract: A lightweight cement block and a method of producing the lightweight cement block, comprising the steps of mixing three parts by volume sawdust with water to form a first mixture having a relative moisture content in the range of 40% to 44%; adding one part by volume sand to the first mixture to form a second mixture; mixing the second mixture with water until the relative moisture content of the second mixture is in the range of 40% to 44%; adding one part by volume cement to the second mixture to form a third mixture; mixing the third mixture with water until the relative moisture content is in the range of 40% to 44%; forming the third mixture into a block. The resultant block comprises sawdust in the range of 30% to 70% by volume, sand in the range of 10% to 40% by volume and cement in the range of 10% to 40% by volume.