Patent GB-997686-A (GB)
Title: Power operated press
IPC: B29C43/00
Filed: 1963-10-18
Abstract: 997,686. Moulding presses. J. E. BORAH. Oct. 18, 1963, No. 41177/63. Heading B5A. A press for moulding articles of rubber and the like in moulds having upper and lower sections, comprises a ram platen 26 and press head 28, movable means being provided to support the lower section beyond the edge of the ram platen, and power means provided on the ram platen for moving the lower section from between the platens. The press described has an intermediate platen 30 dividing the press into two sections containing identical moulds 50, 50<SP>1</SP> and operated by four hydraulic or pneumatic cylinders (as 80, 82, 84). The lower mould 50<SP>1</SP> comprises intermediate and lower mould sections 54<SP>1</SP>, 56<SP>1</SP> resting on aheated platen 60 supported by ram platen 26, and an upper section 52<SP>1</SP> supported by a heated platen 66 supported on the lower side of intermediate platen 30. Upper mould 50 similarly comprises sections 52, 54, 56 (Fig. 8), supported by press head 28 and intermediate platen 30. The intermediate and lower mould sections 54<SP>1</SP>, 56<SP>1</SP> are moved laterally from the press when the mould 50<SP>1</SP> is open, by rods 961, 98<SP>1</SP> of hydraulic cylinders (as 92<SP>1</SP>) the rods being connected to the lower mould section 56<SP>1</SP> by a cross member 100<SP>1</SP> bolted to a lower mould plate 102<SP>1</SP> which rests on platen 60 and is guided by track members (as 107<SP>1</SP>). The moulded articles may be removed by a plunger 140 supported by an hydraulic cylinder and pistonrod 142, 144. The plunger 140 seats on the upper surface of the intermediate mould section, and is attached to it by bolts 148, the plunger is retracted, the lower mould section is returned to the press and a knockout member 152 ejects the moulded article into a container 150. Instead of bolts 148, a magnetic device (Fig. 10, not shown), may be used. The upper mould section 52 is retained in the press so that its position is adjustable by a plurality of laterally extending screws 128, 130 (Fig. 8), provided in tracks 110, 112 in which slides a plate 114 secured to the upper side of the mould section. The upper section is held in floating relationship to the lower mould section by eye pins 132 fitting in slightly enlarged holes in plate 114. The upper and lower moulds 50, 50<SP>1</SP> are identically mounted. Operation.-Mouldable material is inserted in the moulds and the press closed by operation of ram 24. When curing is complete, ram 24 is retracted, and the cylinders (as 80, 82, 84) are operated to retain platen 30 in its raised position, opening mould 50<SP>1</SP>. The intermediate and lower mould sections 54<SP>1</SP>, 56<SP>1</SP> are withdrawn and the article ejected by plunger 140 as described above. These mould sections are reassembled, fresh moulding material is introduced, and the sections returned to the press. Ram 24 is operated to close the mould 50<SP>1</SP>, and then retracted sufficiently to move the intermediate platen 30 to its lower position, keeping mould 50<SP>1</SP> closed and opening mould 50. The article is injected from mould 50, a new charge of mouldable material placed in the mould cavity and the mould sections returned to the press. Ram 24 is operated to close the press, and a new cycle initiated.