GB364181A - Method of and apparatus for producing pottery ware - Google Patents

Abstract

364,181. Moulding pottery-ware. MILLER, W. J., 7337, Schoyer Avenue, Swissvale, Pennsylvania, U.S.A. July 7, 1930, No. 20549. [Class 87 (ii).] Plastic material is forced into the conduit 81, Fig. 13D, from the screw device shown in Fig. 4 of Specification 310,961, [Class 87 (ii), Moulding plastic &c. substances], whence it passes up through a hollow pivot-post 81c and through registering openings into one of a number of cylinders 81e mounted on a turret 81d whence it is expressed by a plunger 83a which is raised periodically by a detent 83j suspended from a cam-operated lever 83i and depressed by a spring 83f, the ware being formed between the porous die-facing 84e and the correspondingly shaped surface of a mould supported on a chuck 62. Compressed air, suction, &c. may be applied to the hollow porous head of the plunger through registering passages 83m, 83m<1>, and tube 83o and to the die-facing through passages 83n, 83n<1>. The turret 81d may be stepped round by a reciprocating rack 81j engaging a gear 81 f which operates on the turret through a ratchet-like detent 81g. The turret is retained at each step by a spring-pressed ball 81i engaging depressions therein. The moulds are raised into proximity with the die-facing by the chuck assembly shown in Specification 310,961 or by the modification thereof shown in Fig. 9B. As in the above-mentioned Specification the chuck spindle 64 is splined into the hollow stem 62c which may be raised and lowered by fork 62h attached to cam-operated lever 62f. Rotation, however, is imparted to the chuck (if desired) by a segmental gear 65, which is integral with a lever 65a reciprocated by a cam 65b on the cross shaft 64i. The chuck 62 may be supplied with compressed air or vacuum through a hood 70 having ports 62a2 connected to annular grooves registering with the ends of passages in the chuck stem 62c. The moulds used in connection with the above apparatus are preferably those described in Specification 283,894 having a standard metal base and a renewable plaster body. Fig. 8L shows a mould for undercut ware having four quadrantal sections 59a slidable radially on pins 59h on a circular plate 59b which rests on a base 59c having projecting rods 59f passing through circumferential slots 59e in the plate and non-circumferential slots in the mould sections so that when a chuck 62 raises the base 59c and rotates it together with the rods 59f relatively to the plate 59b and the sections 59a, the latter may be opened or closed according to the direction of relative rotation. The base has a recess to engage a pin 60 on the chuck. The mould is located on the conveyer-tray 39 on which it is carried by a hole 59i engaging a resiliently mounted pin 61. When the ware is to be withdrawn from the mould, air pressure may be applied to the chambers 59j, 59k in the porous body of the mould through passages registering with passages 62a, 62b in the chuck. Specifications 283,150, 283,894, [both in Class 87 (i), Bricks &c.], 293,023, 293,298, [both in Class 87 (ii), Moulding plastic &c. substances], 296,084, 304,311, [both in Class 87 (i), Bricks &c.], 309,491, [Class 87 (ii), Moulding plastic &c. substances], 361,358, 361,359, and 361,360 also are referred to.