Patent GB-150715-A (GB)
Title: Improvements in molding machines
IPC: C03B9/14
Filed: 1920-07-29
Abstract: 150,715. Tabor Manufacturing Co., (Assignees of Lewis, W.). Sept. 9, 1919, [Convention date]. Moulding - machines. - A roll - over jar moulding- machine, as described in Specifications 10070/14, 10077/14, and 19808/14, has its jarring piston D jointed to, instead of in one with, the mould-supporting head D<5> to avoid fracture, adjustments to allow different size and weight of moulds without dangerous strains or affecting the roll-over table G in the drawing position, the rollover table stop - arm eliminated, and means to prevent undesired movement of the anvil in case of breakage and the table from rolling over when improperly adjusted. The piston D, Fig. 4, has spherical surfaces D' engaged by faces D<4> on the head D<5> and on blocks D<8> bolted thereto. The table G is connected to bell-crank levers H by links P, Fig. 2, the pivots I<2> of which are arranged in eccentrics I<1>, I which can be adjusted to allow for variations in the mould G<5> and the levers H engage adjustable stops H' to support the table G in the drawing position. For jarring, valves O<7>, O<8>, Fig. 3, are opened by moving the handles to the right, disks O<9>, O<10> preventing the valve O<7> from being opened alone, and air from the supply-pipe 0 passes to the valve, R raising its piston R<15>, Fig. 7, to connect the ports R<3> and R<8>, and also passes to the valve P which is closed by a spring but opened by the table G pressing on its piston-rod P<6> to admit air to the bottom of a cylinder C<2>, Fig. 4, in the anvil C which is forced down against springs F<4> as the jar piston D rises until the valve E<8> opens as usual and the air exhausted through passages C<3>, F<2>, B, b, and R<3>, R<8>, Fig. 7. Air also passes through pipes L<4>, Fig. 3, L<3>, Fig. 2, into cylinders L<2> to force pistons L<1> against links J thereby preventing the roll-over mechanism from rattling during jarring. The valves O<7>, O<8> are then closed and O<11> opened' to admit air through a pipe O<14> to a reservoir O<15> from which oil passes through a valve N, Fig. 4, to a cylinder B<1> and forces, a piston M against the head D<5>, the spring closed valve Q, Fig. 2, which the piston M carries being opened by pressing its piston-rod Q<6> against the head. Air also passes along pipes O<5>, Q<9> through the open valve Q, pipes Q<10>, R<6> into the hollow piston R<12>, Fig. 7, which is forced down to allow the air to pass through ports R<13>, R<3> into the cylinder B thereby raising the anvil C, head D<5>, and table G pivoted thereto. When the links J are arrested by stops K<2>, Fig. 2, the levers H, pivoted at H<1> to the head, are turned and acting through the links I<3> roll over the table G. During the latter part of the roll-over operation the floating anvil is moved down and the table G moves downward for drawing by gravity, pistons H<5> push the links J from the stops K<2> and continued rise of the head D<5> draws the pattern, leaving the mould on an elevator S. Then the links engage one of the stops K<5>, K<6>, K<7> and the table G is rolled back, the valve O<11> being turned to connect, the pipes O<5>, O<14> to a constricted exhaust O<12>, Fig. 3, whereby the parts return to their original position, the valve N being adapted to retard the return of oil from the cylinder B<1> towards the end of the stroke of the piston M. If the roll-over mechanism is not correctly adjusted or any part breaks, so that the pressure on the stops K<2> or K<5> &c. is not equal, one of the slides K<1>, Figs. 2 and 3, which carry the stops and are connected by chains K<15> in grooves A<2>, will move up and, acting through a cord T, T<2> and lever O<13>, open the valve O<8>, which effects the opening of the cylinder B to exhaust so that the anvil &c. fall.