Abstract: The invention relates to a top part for a shaft, having an access part and a shaft cone which is connected to an access part and, with a connecting element on that side of the shaft cone that lies opposite the access part, can be mounted onto a further shaft element, the shaft cone having a substantially convex basic shape, characterized in that, in the region of the shaft dome, stiffening structures are disposed on the inner surface of this shaft dome, which extend substantially radially or parallelly, angularly or concentrically from one or more imaginary points or lines within or outside the dome downwards over the curved shape of the shaft cone.

Abstract: The invention relates to a top part for a shaft, having an access part and a shaft cone which is connected to an access part and, with a connecting element on that side of the shaft cone that lies opposite the access part, can be mounted onto a further shaft element, the shaft cone having a substantially convex basic shape, characterized in that, in the region of the shaft dome, stiffening structures are disposed on the inner surface of this shaft dome, which extend substantially radially or parallelly, angularly or concentrically from one or more imaginary points or lines within or outside the dome downwards over the curved shape of the shaft cone.

Abstract: An injection mold for producing, from thermoplastic plastic, fittings which have an annular groove on the inside. The injection mold includes an outer mold, divided into a first and second mold half and along a parting line, and a mold core being axially displaceable along a mold half. A complementary mold bead for forming the annular groove is formed by levers carrying ring segments. A slider, which bridges the parting plane of the outer mold and is connected to the second mold half, has guide grooves of differing obliqueness, in which there engage motionally lateral projections both of the mold core and of the actuating element. A guide, which extends the opening stroke of the mold core, is formed at a distance from the parting plane, between the slider and at least the mold core, the guide preferably comprising second, lateral projections and second guide grooves.

Abstract: For the purpose of producing, from thermoplastic plastic, fittings (15) or the like which have at least one annular groove (16) on the inside, an injection mould has an outer mould which can be divided in a parting line (20), a mould core (2) being axially displaceable along a mould half (1). A complementary mould bead for the annular groove (16) is formed by levers (6) carrying ring segments, and an actuating element (8) for swivelling the levers (6) is disposed in an axially displaceable manner in the mould core (2). A slider (14), which bridges the parting plane (20) of the outer mould and is connected to the second mould half (3), has guide grooves (91, 93) of differing obliqueness, in which there engage motionally lateral projections (101, 103) both of the mould core (2) and of the actuating element (8), said projections being disposed in the parting plane (20).

Abstract: An injection mould for manufacturing fittings (1) from thermoplastics, which fittings are provided on the inside with at least one annular groove (6), includes a separable outer mould (5) and a mould core (4) which can be pushed into the outer mould (5). A complementary mould bead for forming the annular groove is configured on the mould core (4). The injection mould has a cavity which is formed in the area of the annular groove (6) of the fittings (1) by a plurality of segments (3, 3′) that can be assembled together. The outside surface of the portion of the cavity that forms the area of the fitting (1) surrounding the annular groove (6) is partly formed by the separable outer mould (5) and partly by a mould ring (2) connected to the mould core.

Abstract: An apparatus for injection molding bent pipe made of plastic material which has a bend part (8) with an arcuate centerline and with uniform internal cross-section, and cylindrical connecting parts (9, 22) adjoining the bend part at one or both sides. The connecting parts (9, 22) have larger internal cross-section than the bend part (8). The apparatus includes an injection mold which can be divided along a plane containing an arcuate centerline of the bend part into at least two outer mold portions which form a mold cavity. The injection mold includes a bend core with a pivotal member (5) which is pivotable along the arcuate centerline of the bend part and a cylindrical core (13) which is displaceable axially along its centerline, for each connecting part (9, 22).

Abstract: Described is an injection molding mold for the production of fittings from thermoplastic material which have at least one annular groove at the inside, comprising a mold core which is formed in the region of the annular groove of the molding by segments (8, 8') which can be moved inwardly to such an extent that the mold core can be moved out of the annular groove in the axial direction, wherein the inward and outward movement of the segments (8, 8') is produced by rotation of a control shaft (11) and wherein each of the segments (8, 8') which are only radially movably guided in a stationary guide disk (15) is provided with a projection (14) which engages into a guide slot (13, 13') in a control disk (12) which is fixedly connected to the control shaft (11).

Abstract: A die mold for the production of a fitting to be surrounded by a single-piece ring includes mold components separable along a plane extending parallel to the longitudinal axis of a fitting to be produced, the mold components having therein a recess into which is inserted the ring. A closure member closes the recess during molding and forms a wall of the die mold. The closure member is divided peripherally into plural portions each of which is of unitary and single-piece construction in a direction parallel to the longitudinal axis and which extends in such direction beyond at least one axial end of the recess.

Abstract: A mould which is used for the production by injection moulding of fittings which have an inner annular groove includes a divisible outer mould, a mould core and a mould ring. The mould core has a plurality of segments which can be folded together. In order to ensure with absolute reliability that the fitting does not remain clinging to the mould ring during removal of the fitting from the mould, the mould ring is connected to the mould core and is withdrawn together with the mould core from the fitting.