Abstract: The method of making the casing comprises the steps of preparing a powder mixture consisting predominantly of a metal powder mixed with a minor proportion of graphite powder ranging from about 0.2% to about 2%, preferably 0.8% by weight, while the metal powder ranges from about 99.8% to about 98% by weight. The powder material is compressed into a casing mold to a molded density ranging from about 0.21 to about 0.24, preferably 0.23 of a pound per cubic inch. The molded powder is sintered in an inert atmosphere at a temperature ranging from about 1500 to about 1700, preferably 1600.degree. F. for a time sufficient to unite the molded powder into a brittle porous frangible casing. The graphite powder vaporizes and escapes from the molded casing during the sintering step whereby porosity and frangibility are imparted to the casing.

Abstract: The projectile, adapted to be fired from an automatic cannon, comprises a frangible porous brittle generally cylindrical casing having a tapered nose portion and made of a molded sintered powder material preferably consisting predominantly of 60 to 100% type 316 stainless steel powder, the remainder being pure iron powder. The rear end of the casing is formed with an axial bore wherein a hard dense penetrator rod is received, preferably made of tungsten or tungsten carbide. Behind the penetrator rod, the casing has an enlarged bore wherein an incendiary pellet is received, preferably comprising zirconium crystals molded in an epoxy matrix. A massive closure plug closes the enlarged bore behind the incendiary pellet. Upon impact with a target, the frangible casing disintegrates into granular fragments while the penetrator rod punches a hole in the target through which the fragments are propelled.

Abstract: A flechette is disclosed comprising a rod-shaped steel body having a blunt generally conical penetrating point, a separate resinous plastic fin component securely mounted on the rear end portion of the body, and a generally conical gradually tapering resinous plastic nose piece securely mounted on the penetrating point for reducing air drag when the flechette is fired at high velocity. Interlocking annular flanges are formed on the penetrating point and the nose piece for securing the nose piece to the body. The fin component has an axial sleeve received around a rear pin portion of the body and securely retained thereon by annular flange and groove members on the sleeve and the rear pin portion. A modified flechette is disclosed having a separate, hardened steel penetrator component securely mounted on a reduced front pin member on the body by a press fit between the front pin member and a rearwardly opening bore in the penetrator component.

Abstract: The safe and arming device comprises a housing containing a setback weight movable rearwardly against the resistance of springs in response to forward acceleration of the housing. A fire tube in the housing has a fire tube opening, blocked initially by first and second swingable inertial arming lugs. The weight carries a pin having a first portion initially received in a first opening in the first lug for retaining it in its safe position. The setback of the weight withdraws the first pin portion from the first opening. Spin acceleration causes swinging of the first lug to its arming position wherein a detonator on the lug is aligned with the fire tube opening. The lug has a second opening for receiving a second pin portion when the weight is spring-returned after cessation of the acceleration, whereby the lug's arming position is maintained. The second lug has a third opening for receiving a third pin portion to maintain the safe position of the second lug.

Abstract: The projectile, adapted to be fired from an automatic cannon, comprises a frangible porous brittle generally cylindrical casing made of a molded sintered powder material preferably consisting predominantly of 60 to 100% type 316 stainless steel powder mixed with pure iron powder ranging from 40% by weight to zero. The powder material initially includes graphite powder ranging from about 0.2% to 2% by weight. The powder material is compressed into a casing mold to a molded density ranging from about 0.21 to about 0.24, perferably 0.23 of a pound per cubic inch. The molded powder is sintered in an inert atmosphere at a temperature ranging from about 1500 to about 1700, preferably 1600.degree. F. for a time sufficient to unite the molded powder into a brittle porous frangible casing. During sintering, the graphite powder vaporizes and escapes whereby porosity and frangibility are imparted to the casing.

Abstract: A dump bailer is lowered on a wireline in a well through tubing for placing a cement slurry on a retainer located in the well. The dump bailer has a weight bar assembly that includes upper and lower sections that are extensible relative to each other. The upper weight bar section has an electrical contact that engages the electrical contact mounted in the upper end of the housing of the dump bailer. The lower section has a seal which separates the housing into upper and lower chambers. Cement is pumped in from the bottom, pushing the weight bar assembly upward until the contact on the upper weight bar section engages the upper contact. A detonator is located on the bottom of the lower weight bar section. Explosive force of the detonator transmits a shock wave through the cement slurry to expel a shear plug located on the bottom of the housing. The weight bar assembly pushes the cement from the slurry once this occurs.