Abstract: According to the invention, calibrated rings are obtained by superficially vulcanizing extruded or profiled extrudate at the exit of an extrusion head (T), then by cutting this vulcanized extrudate into portions by means of a conical cutting device (C), subsequently by butting the two ends, in the respective form of a conical tip and a funnel, of each portion (t) together under hot conditions and under a controlled pressure, in order to obtain a ring blank which is then engaged between the half-cavities of a mold (Mo), where it undergoes shaping and vulcanization by the heating of the latter and thereafter deburring as a result of a shearing action produced by a push device (D) causing the half-cavities to slide in the closed position in the frame of the mold, before causing the opening of the latter by means of a device (G) and the release of the calibrated and superficially clean ring obtained.

Abstract: A method of making O-rings by depositing a filament of a liquid hot-melt material onto a rotating spindle, or directly upon the shank of a rotating fastener.

Abstract: Apparatus for forming graphite into packing rings utilizes a press to compress the graphite within a movable die. The graphite is supplied to the press by the combination of a turntable-type feeder and a tubular feeder which places increments of the graphite in dies carried by the turntable. The punch has a retractable pin which cooperates with a lower core pin to maintain the interior diameter of the rings as they are formed. The press and turntable are connected for synchronous operation.

Abstract: A piston ring is formed by annular upper and lower parts which contact one another at respective surfaces normal to the axis of the piston ring. The parts can be injection moulded from thermoplastics materials with the parts themselves having no re-entrant portions, so allowing quick and easy manufacture, but with the parts together defining re-entrant portions such as a spring-receiving recess at the inward side of the ring or a pair of spaced oil control rails at the outward side of the ring.

Abstract: A method of molding an elastomeric resilient ring member having a generally +-shape comprising the steps of providing a mold having a pair of mold halves, each having an exposed annular mold cavity therein, the surface defining each of the cavities comprising first and second inwardly directed lobes extending at a 90.degree. angle to each other from the inner corners of the cavity, at 45.degree. angles to the plane of the cavity; and using such a mold for molding, in a conventional manner, a resilient ring member.

Abstract: A method and apparatus for forming packing rings from substantially any type of loose or ribbon fiber packing material are disclosed. The apparatus utilizes a plurality of concentric cylindrical members to produce the different sized packing rings, with the number of cylindrical members in use remaining constant regardless of the size of the packing ring produced. The method allows for the use of either ribbon or loose fiber packing material to be compressed into a packing ring of any desired size within the capability of the apparatus.

Abstract: A mold apparatus for forming various sizes and shapes of wax castings to provide a means for producing rings in volume therefrom, wherein the mold apparatus comprises a drum member defining the main mold housing having a casting bore of a pre-determined configuration disposed therein, the housing being provided with a pair of removable end plates, the plates being held in place by a tubular support mandrel passing through the cavity and the end plates; wherein a ring-sizing band can be received within the cavity to control the overall size and thickness of the wax casting; and wherein there is included a finger-sizing band adapted to be mounted on the tubular support mandrel within the casting cavity, whereby the selection and arrangement of various sized bands will form numerous ring configurations and sizes when hot wax is injected through an injector inlet port formed between the drum and one of the end plates.

Abstract: A pair of matched metal dies one of which moves against the other to form a mold to contain, and to apply pressure to a part and to pinch off excess material on the part. The lower die has a recess with all the sides of the recess canted outward in two steps. The upper die when inserted contacts the lower canted sides of the lower die.

Abstract: A mold for fabricating articles formed of a fluent material, especially rubber, comprising at least two mold parts enclosing a mold compartment. One of the mold parts possessing a tear or break groove at the region of the mold parting plane, the tear groove surrounding the mold compartment. The tear groove provided in said one mold part has an inner wall which is located exactly opposite the marginal or outer rim of the mold compartment formed in the other mold part and encloses an angle of about 90.degree. or less with the mold parting plane.