Patent GB-703413-A (GB)
Title: An improved compression mould for moulding panels and the like
IPC: B27N5/00
Filed: 1950-12-12
Abstract: 703,413. Moulding panels &c. from fibrous material and a binder. PRASE, W. Dec. 12, 1950 fDec. 12, 1949], No. 30289/50. Class 87 (2) [Also in Group VIII] A compression mould for the moulding of plastic substances has its walls formed of a plurality of intimately engaging sections slidable telescopically one within the other with relative movement on the axial direction only so that the thickness of the mould wall increases progressively as the telescoping wall parts are forced one into the other. The wall elements 2, 3, 4 of the mould, which are flanged at 5, 6, 7 can telescope from the expanded position shown in Fig. 1 to the compressed position, Fig. 3, being guided by pins 19, 23, 24 which are staggered as shown in Fig. 5. Combined with the guide pins are collars, e.g. 22 on the guide pin 19, which limit the outward movement of the mould elements. When the mould is compressed it is surrounded by a frame 1 of relatively strong angle-iron which is clamped to a bottom plate 8 by casement fasteners 9. In a rectangular mould the fasteners 9 act on three sides and the fourth side is held by claws 10 which allow a slight hinge motion whereby, after releasing the fasteners 9, the mould can be tilted, Fig. 9, by levers 34 pivoted to the frame 1 and having cam-shaped extensions 37. Tending to open the mould to its expanded position are levers 15 fulcrummed in lugs 13 on the frame 1 and urged by springs 17 in the direction of the arrows 18, Fig. 5, so that rollers 16 on their free ends press beneath the flanges 7 of the top wall element. To facilitate the removal of the mould from the frame 1 the latter may be slotted as at 42, Fig. 10, and locked by a quick-clamping device 39. Boards with veneer on both sides and a jointing ledge on at least one edge are produced by placing a veneer 26 at the bottom of the mould, placing half a jointing ledge 28, with a right-angled triangular cross-section, on the veneer with a film of glue on its small lower face and on its hypotenuse face 30, and placing a complementary half jointing ledge 29, of similar crosssection, in the position shown in Fig. 1 and glued on its small upper face, so that its hypotenuse face slides on the face 30 of the other half 28 as the mould is compressed, when the halves 28, 29 become glued together and to the veneers 26, 32 respectively. The top edge of the lower half 28 is bevelled as shown so that, as the wall elements of the mould telescope together, their inner faces slip behind the lower half 28 and push it inwards. Lengthwise, each element 28, 29 is in two parts, shaped to form an oblique joint when moved together on compression of the mould, this division avoiding distortion of the jointing ledges. The walls may be recessed to allow air to escape. The frame 10, instead of being rectangular, may be annular. The preferred material for the mould is metal, but other materials, e.g. wood, are suitable. The mould is adaptable for toy figures by providing a cavity in the bottom part of the mould for one side of the figure shaping the intermediate part according to the contour of the figure and making the top part of the mould correspond to the contour and using it as a feed hopper for the charge of material to be filled in,