Patent GB-190602421-A (GB)
Title: Improvements in Apparatus for Casting Curved Stereotypes.
Inventor: LOCK WILLIAM HENRY
Filed: 1906-01-31
Granted: 1907-01-31
Abstract: 2421. Lock, W. H., [Wood, H. A. W.]. Jan. 31. Stereotype.-Relates to curved-stereotype casting-apparatus of the kind in which a segmental back co-operates with a cylindrical core, the metal is delivered into the mould by the lift of a power-driven pump, and the core is turned through 180 degrees for removal of the stereotype, and consists in providing (1) manual instead of power means for raising and lowering the segmental back and moving the pump and throat into and out of casting position, and corresponding automatic safety devices, and (2) special manual means for rotating the core and automatic means for stopping and locking it. Reference is made in the Provisional Specification to Specification No. 2525, A.D. 1900. In the apparatus shown in Figs. 3 and 8, the pump piston 33 is reciprocated by power through parts 20, 22, 27, 28, 30, and the pump valve is normally held open by a finger 84 on a shaft 83 connected by a lever 82 and a link 81 to a starting-handle 80. (1) The back B, Fig. 3, is raised and lowered by means of a hand-lever 43 on a shaft 42 having connexions 44, 45, 46, 47 with togglelinks 49. Counterpoises 50 depend from levers 51 connected to the back by links 52. The pump and throat T are shifted by means of connexions between the throat and an arm 53 on the shaft 47, comprising a link 54, three-armed lever 55, link 56, shaft 58 with arms 57, 59, and adjustable links 60. The pump-valve rod is automatically raised by means of an adjustable weight 68 and rack-and-pinion gear 167 on release of the finger 84. In order to prevent injection of metal before the back is raised into position, a second finger for holding down the pump-valve rod is provided on a rock-shaft actuated from the shaft 58. In order to prevent closing of tha pump valve except when the piston is on the point of lifting, the starting-handle 80 is provided with an arm 86 for co-operation with a locking-segment 79 on a pivoted arm 78 operated from the pump lever 20 through a link 71, bell-crank lever 72, slider 73, and rod 74. The segment 79 locks the handle 80 in both the open and closed positions by engagement over or under the arm 86. The slider 73 works against a cushioning-spring 75 for preventing accident in case the handle is not rocked far enough in time for the segment 79 to pass under the arm 86. In order to prevent premature lowering of the back, the shaft 83 is provided with a finger 830 for engagement against a shoulder 570 on the arm 57. In order to render the pump inoperative after each working cycle, the starting-handle 80 is returned by a spring 85 as soon as the segment 79 is rocked clear of the arm 86. (2) The core C, Fig: 5, is rotated by means of a handle 90 and gearing 89, 88, 87 and is automatically stopped and locked by means of studs 91, a pawl 93, and a yielding detent 97. The pawl 93 is pivoted on a hand-lever 92 resting on a stop 194. A spring 94 holds the pawl 93 in position and a stop 95 limits the backwafd movemeat of the pawl. The detent 97 is on a pivoted arm 96 held up against a stop 98 by a spring 99.