Patent GB-697970-A (GB)
Title: Apparatus for the manufacture of compressed moulded articles from ceramic masses or the like
IPC: B28B3/02
Filed: 1950-08-17
Abstract: 697,970. Presses for moulding bricks &c. KOPPERS GES. H. Aug. 17, 1950 [Aug. 17, 1949], No. 20455/50. Class 87 (ii). Ceramic material is subjected in a mould to the constant pressure of a basic load and, at the same time, to intermittent impacts, the load and the impacts being transmitted to the material by rams entering the mould from opposite sides. The impacts in each direction are synchronized. The intermittent impacts are generated by spring- assisted hammers 17, 20 which are activated by cams 21, 22 co-operating with. withdrawable catches 25, 26 on the hammers. Cam 21 'is mounted on the driving shaft 32 of the press whilst cam 22 is driven from this shaft by bevel gears 33, 34 and shaft 31. The (two) hammers 20 are mounted inside the upper cam 18 which is mounted on the end of pivoted arm 38 forming a casing for the gearing 33, 34. The impacts of the hammer 17 are transmitted to the lower ram 8 by a lever 12 and reciprocable ram-support 7. The end of the lever 12 rests between a compression spring 15 and a bearing block 14 on the support 7. The lever may be replaced by a pressuretransmitting system in which the hammer 17 acts on the end ball of a series of balls arranged in a tubular housing, the other end ball bearing against the ram support 6. The working cycle of the press is controlled by cams arranged on a shaft 43 which may be connected to the driving shaft 32 through an intermediate gear 47 and a footoperated coupling 65. Rotation of the cam-shaft .43 causes, first of all, the lowering of the ram 18 into the mould by means of cam 49 and levers 39, 40. Next, a cam 73 releases the catches 25, 26 through levers 69, 69a, 70, 71, 72 and the hammers 17, 20 come into action. The hammers remain in action until the cam 73 causes withdrawal of the catches 25, 26. At the end of the compression period the cam 49 raises the upper ram 18 by about 50 mm., a further cam 52 acting through a lever 54 causing the moulding frame 2 to be raised by the same distance. Immediately afterwards, a roller-mounted take-off carriage 64, actuated by a cam 59 and levers 61, 62, 63, enters the space below the mould frame 2. The discharge of the moulded article is completed by further upward movement of the mould frame 2 and the return of the carriage 64. The upper ram 18 and the mould frame then return to their original positions. The coupling 65 is automatically activated to disconnect the cam shaft 43 at the end of the cycle. For the moulding of hollow bricks a core 79 is provided. This core is withdrawn from the mould just before the discharging step by means of a cam 74, levers 76, 77, 78 and rod 80. During the moulding the core is pressed upwardly against the ram 18 by means of a spring 83 acting on the lever 78. The mould 2 may be provided with contoured inserts and a contoured pallet. Two modifications are briefly described. In the first, the upper ram is activated hydraulically. In the second modification pressure on the upper and lower rams is provided by double levers connected in the manner of shears. The loading and impact devices may be displaceable along the free ends of the levers in order to vary the pressure.