摘要:
A container comprises a body (12) having a base and an open mouth (18). A protective ring (20) fits snugly over a rim (16) of the body (12) encircling the mouth (18), and a closure (38) is insertable into the ring (20) to close the mouth (18). The ring has an outer portion (22) which lies against an outer surface (24) of the body (12) adjacent to the rim (16) and which has an inturned flange (26) biting into said outer surface (24), and an inner portion (28) which has a curled edge region (30) curved to provide the latter with a concealed edge (34) and engageable behind a shoulder (42) on the closure (38). The closure (38) or the ring (20) is resiliently deflectable to permit insertion of the closure (38) through the ring (20).
摘要:
A method of forming a smooth shoulder (16, 14b, 19b), neck (17, 37) and flange (18, 38) at the open end of the cylindrical side wall (12) of a can body (10) comprises the steps of forcing a marginal edge portion (13) of the side wall into at least a first die to form a first portion of reduced diameter having a first shoulder portion (14) and a first cylindrical portion (15); and optionally applying at least one rolling operation to the first portion of reduced diameter, and any further die formed portions of reduced diameter subsequently formed, to generate a smooth shoulder (16, 14, 19b), neck (17, 37) and flange (18, 38). Reference is made to the roll forming process described and claimed in British Patent 1,534,716 as being particularly suitable. The margin-portion (13) is preferably thicker than the rest of the side wall (12).
摘要:
A continuous extrusion machine, in which feedstock is admitted (at 50) to a peripheral groove (12) in a rotating wheel (10), is enclosed in that groove by a cooperating shoe (24), and is frictionally dragged along the arcuate passageway (48) formed by said groove and a projecting portion (30) of said shoe towards an abutment (36) carried by the shoe. The pressure in the metal in front of the abutment continuously extrudes a metal product through a die (42). The abutmenttip and adjacent wheel parts disposed downstream of the abutment are cooled directly by a jet of cooling fluid issuing from a nozzle (64) carried downstream on the shoe. An annular band (Figure 2, 74) of a good thermally-conductive metal embedded concentrically in the wheel enhances the cooling obtained. Flash (68) extruded through clearance gaps (32, 34) between cooperating wheel and shoe surfaces is intercepted and broken off periodically, in short lengths, by teeth 70 projecting from the wheel. The radial depth of the passageway (48) progressively decreases in the direction of wheel rotation in a zone extending upstream from the abutment (36), so as to improve in that zone, in the case of particulate or comminuted feedstock, the metal flow pattern adjacent the abutment, such feedstock in that zone being in a fully compacted condition without voids. This is achieved by the shaping of a surface (40A) of a die block (40) which adjoins the abutment (36) and incorporates the die member (42). That shaping produces with particulate or comminuted feedstock a metal flow pattern closely resembling that achievable with feedstock in solid form. A continuous extrusion product (Figure 5, 102) issuing from a continuous extrusion apparatus (Figure 1, 10; Figure 5, 100) is threaded through a treatment die (104) whereby to change its cross-section, and is continuously drawn therethrough by a tensioning device (106,112) underthe control of a system which (a) senses the temperature of the product (102) as it leaves the extrusion apparatus (100); (b) converts a temperature signal (120) so produced, in a function generator (124), into a tension reference signal (126); (c) compares with that tension reference signal a tension feedback signal (116) derived from a sensor (118) adjacentthe extrusion apparatus; and (d) controls the tensioning device in accordance with the difference of the tension reference and feedback signals so as to prevent the sensed tension in the product extending between the extrusion apparatus (100) and the treatment die (104) from exceeding a safe value which is less than the yield stress tension of that product at the sensed temperature.
摘要:
A frustoconical ring body comprises at least one and preferably a pile of tough and elastic, frustoconical ring elements (11) each having a central opening (11a) for slidably accepting therethrough a first cylindrical member (1) and an outer edge (11e) adapted for engagement with a second member (4). The ring element (Figs. 2a,2b, not shown) has a plurality of outer slits (11f) extending radially inwardly from the outer edge and a plurality of inner slits (11d) extending radially outwardly from the central opening. An inclination adjusting member (6) is displaceable along one of the (1,4) members so as to maintain a bearing contact with the ring body and to change a frustoconical angle, thereby regulating the state of engagement of the ring body with the first and second members. The assembly may be used either as a bearing (Fig. 3); a brake (Fig. 14); to mount a bearing race (Figs. 6,7); or as a gear (Figs. 9 to 13), in which case the outer edge of the ring body has gear teeth which mesh with teeth on the second member.
摘要:
Procede et appareil de formage d'un corps de boites metalliques de conserves a parois coniques par etirage. Le procede comprend les etapes suivantes: (a) produire un flanc d'un corps de boites metalliques de conserves (64) comprenant une paroi cylindrique lisse (66), une base solidaire (68) a une extremite de cette paroi, et un bord libre taille (70) expose a l'extremite opposee ouverte de cette paroi, ce bord etant generalement normal a cette paroi; (b) faire avancer le flanc du corps de la boite de conserve, la base en premier, dans une matrice (42) (ci-apres denommee 'la matrice conique') a l'aide d'une etampe (18) engagee a l'interieur du flanc, seulement avec la base de ce flanc, de maniere a amener cette paroi progressivement en contact de plus en plus grand avec une surface de travail interieure conique (44) de la matrice; (c) simultanement avec l'etape (b), appliquer une pression longitudinale, ainsi qu'une contrainte transversale, sur le bord libre expose de cette paroi a l'aide d'un collier de pression (28) de maniere a pousser les flancs carrement dans la matrice conique, tout en maintenant au moins cette pression, et la contrainte, au fur et a mesure que le flanc avance progressivement dans la matrice conique; et (d) continuer de faire avancer ce flanc par avance continue de l'etampe et application simultanee de la pression longitudinale, et de la contrainte transversale, sur ce bord, jusqu'a ce que la paroi repose uniformement contre la surface de travail de la matrice sur une longueur longitudinale desiree de la paroi.