Patent GB-146849-A (GB)
Title: Machine for making foundry moulds
IPC: B22C5/00
Filed: 1920-07-05
Abstract: 146,849. Beardsley, E. O., and Piper, W. F. June 22, 1917, [Convention date]. Mould and core materials; moulding-machines. -A machine for treating used moulding-sand and projecting it into moulding-boxes is mounted on a carriage 1, Fig. 1, which can be driven at different speeds and has its projecting-device 15 carried on the end of a radial arm 14 mounted on another radial arm 13, both capable of being swung in an horizontal plane. The wheels 118 of the carriage 1 are driven by an electric motor 2, Fig. 2, belt 121, shaft 122, chain 124, shaft 36, clutch 131, worm 160, and differential 117 when the machine is being moved about, but when the machine is in operation the differential may be locked and the clutch 131 is moved to throw in the slow drive comprising variable-speed friction gear 126 and reducing worm gear 127. When the machine is in operation, it is driven to the left and used sand on the floor is collected by guides 26, 27 and worms 28, lumps are broken by knives 28<a>, and the sand elevated to a shoot 47 by a bucket chain 25 driven from the shaft 29 of the worms 28 which is driven, through a free-wheel clutch 33 and gearing 32, 31, 30, from the shaft 36. The shoot 47 delivers the sand into a riddle 54 through which it falls into a shoot 48, all these parts being carried by arms 49, 50, Fig. 1, from the arm 13 and reciprocated by crank 82 and motor 80. The sand falls from the shoot 48 into a shoot 78 similarly carried by the arm 14 and reciprocated by a motor 84 which drives the projecting-device 15. The arms 13, 14 are carried by ball bearings at 6 and 20 and are swung to bring the device 15 over the required moulding-box by pinions 8, 21, racks 9, 22 and pistons in cylinders 12, 25 controlled by valves 95, 94 which, with the switches controlling the motors 2, 80, 84, are arranged near the driver's seat 16. The arm 5 carries an adjustable pawl 64, Fig. 4, which drives a ratchet 65 having an eccentrically-mounted pawl 67 driv. ing a second ratchet 68 which, through a pin-andslot engagement, intermittently turns a valve 70 into four successive positions as determined by rollers 75 carried thereby and a spring 76. In two of the positions the valve is closed but in the other two it admits pressure fluid to either end of a cylinder 57, Fig. 5, thereby rotating the riddle about its axis 52 to reverse the position of the two' perforated sides 54, that at the bottom being in use while that at the side is being cleaned by striking a weighted lever 62 and by its reciprocation. Any bodies that will not pass through the riddle fall into a box 101, Fig. 2, which can be emptied by invertion as required. The bucket chain 25 is tensioned by a yielding device applied to the shaft 38, Fig. 1, on which the chain.wheel turns freely. Keyed on the shaft 38 are pinions engaging fixed racks 40 and a wheel 44 engaged by a belt 45 fixed at one end and attached to a spring 46 at the other. The supports 42, 43 are formed as reservoirs for the fluid, such as oil, under pressure and when exhausted. A pump 98, Fig. 2, driven from the shaft 122 returns the fluid to the pressure reservoir. The wheels 104 may be pressed down by pistons in cylinders 107 to raise the guides 27 off the ground when the machine is not in operation and they may be turned, for steering the carriage, by linkwork 112, 113 and a piston in the cylinder 114.