A conductor lead-through for elongated bodies, such as electric current conductors, which conductor lead-through is vacuum tight and contains no welded joints and is particularly suitable for use with difficultly weldable or non-weldable combinations of materials, said conductor lead-through comprising an assembly of parts including a cover, an intermediate ring engaging one end of the cover and a seal, such as an O-ring seal, the latter being fitted about said cover, said parts of said assembly...

Relates to a method of and apparatus for electric welding through insulation coatings, such as paint, on metallic surfaces by directing a vapor jet of paint solvent upon a selected area of a painted metal surface to first soften and then vaporblast the softened paint away from the area to expose a bare spot of the metal surface for welding. Then, before the softened paint reflows back over the bare spot as a result of the discontinuance of the vapor jet, quickly bringing a metal part into weldin...

A follow through indicator for bowlers comprising a planar base element on a wristband for fastening to a bowler's arm, preferably adjacent the wrist, such that the base element is disposed in a plane parallel to the plane of the path of the bowler's arm during delivery and throw of the ball. An indicator element such as a pendulum bar is pivotally mounted on the base for movement from an initial rest position to a position indicating that a proper follow through has been made, the base serving ...

A device for passing through pipelines comprises a cylindrical structure with a flexible cylindrical sleeve firmly located around the outer curved dimension of the structure, the sleeve being capable of expansion by internal fluid pressure within an annular chamber formed in part by the sleeve and having at least one fluid connection accessible at an axial end of the structure.

A plastics strain relief bushing for a cable passing through a hole in a panel, comprising a hollow body for insertion in the hole and having a head to engage one side of the panel and retainer to engage the other side and prevent its withdrawal. A locking member rotatable in a non-cylindrical hole in the body has at least one resilient finger which is urged by the wall of the hole into gripping engagement with the cable when the member is rotated through part of a revolution, and is released on...

An apparatus for heating billets and the like prior to hot extrusion is disclosed. The apparatus includes an elongated, insulated tunnel having an inlet opening and an outlet opening. A conveyor extends through the tunnel from the inlet to the outlet and conveys a plurality of equally spaced, transversely arranged billets in a step-like manner. The conveyor rotates the billets as they are conveyed through the tunnel. A source of high temperature air is connected to a plenum positioned above the ...

Diffusion coating of internal surface of workpiece accessible only through very narrow passageway, is simply effected by coating that surface with uniform layer of particles of the metal to be diffused into it, and then holding the thus-prepared workpiece at diffusion-coating temperature in a diffusion-coating atmosphere.

A pyrotechnic delay system for controlling the time of events from initian of an initial ignition impulse to ignition of a secondary output.

A flow-through centrifuge free of rotating seals. The centrifuge includes a frame having three spaced apart horizontal plates which carry a central bowl, a countershaft and a tube-supporting hollow shaft. A motor is arranged to drive the frame at an angular velocity of .omega.. The countershaft is driven by a stationary pulley on the motor and drives the bowl at an angular velocity of 2.omega.. The motion of the countershaft is also transferred to the tube-supporting hollow shaft by a pulley cou...

A straight-through flow muffler (10) is shown. A cylindrical housing (11) has an inlet (13a), an outlet (14a), and a pair of axially aligned, longitudinally spaced tubes (15, 16) extending from the inlet and outlet into the center of the muffler housing. Imperforate baffles (17, 18) separate the muffler housing into a plurality of attentuation chambers (20, 21, 22) surrounding the tubes (15, 16). A pair of sonic chokes (25, 26) are mounted in series in the tubes. The baffles and a pattern of per...