Patent GB-381446-A (GB)
Title: Improvements in and relating to delivering molten glass from a container
IPC: C03B7/086
Filed: 1932-02-15
Abstract: 381,446. Delivering molten glass. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.-(Europõischer Verband der Flaschenfabriken Ges.; 10, Breitestrasse, D³sseldorf, Germany.) Feb. 15, 1932, No. 4494. [Class 56.] In apparatus for delivering measured mould charges of molten glass from an opening in the bottom of a furnace extension or boot, comprising a hollow, rotary, preferably cylindrical, flow regulator, which is axially adjustable and projects downwardly into the bottom opening, the glass entering the regulator radially and being forced out through its lower opening in a regulable manner by a plunger, the regulator has only a lateral opening communicating with its interior through which, by means of a plunger outside the regulator, a quantity of molten glass, corresponding to the glass mould charge passing out of the lower opening of the regulator at each downward movement of the plunger, is forced into the hollow space of the regulator. The boot 10 of a glass furnace has a well 11 defined by a dam 12 and provided in its floor with an outlet 13 through which glass issues under gravity, being separated into mould charges 14 which are severed by cutters 15. A gate 18 controls the rate of flow in the usual manner. The forward end of the boot is made lower to give increased heating of glass in the well 11, which is divided by a wall 23 into two communicating chambers 24, 25 which accommodate a glass flow regulator or valve 26, and a plunger 60. The valve 26 has a conical base forming an annular passage 27 with the outlet 13. Glass flows through a lateral passage 29 in the valve to a measuring chamber 30 and thence by an axial opening 28. The end 31 of the valve extends below the outlet 13 so that glass issuing through the passage 27 is chilled and forms a skin which covers the hot glass from the central opening. The valve 26 is adjusted vertically by rotation of a screw 38 thereby varying the thickness of this skin and the distance between the upper side of the opening 42 and the wall 41 of the opening 29. The valve is held in a chuck 32 which is rotated by means of a shaft 43 carrying a bevel gear 45 meshing with a pinion 46 on a stub shaft 47 which is driven through sprockets and chain 51 from a rotary cam shaft 53. The plunger 60 is carried by a rod 62, pivoted to a lever 65 which is rocked on its pivot 66 by a cam 68 engaging a cam 69 on the shaft 53. The plunger is reciprocated to move downwards when the opening 29 faces it, thus accelerating the outflow of glass. Varying the speed of rotation of the valve 26, predetermines the time of register of the openings 29, 42 and therefore regulates the size of the glass charges. As the plunger moves upwards, a retarding force is applied to the glass in the chamber 25 causing a necking of the issuing charge. In a modification, Fig. 6, the boot of the furnace is provided at the front with a transverse narrow well 70. A tapered opening 71 accommodates the end of the valve 73 which is rotated through a gear 80, pinions 81, 106, chain 83 and cam shaft 82. The valve is vertically adjustable by means of rods 85. Plungers 87 extend into the well on opposite sides of the valve 73 and are rotated through gears 90, 91, the plunger shafts 88 being connected by swivels 115 to adjustable link connections 10 pivoted by pins 92 to levers which are fulcrumed to rock by the action of cams 96 on the shaft 82. Each plunger 87 makes its downward stroke when it faces the lateral opening 79 in the valve 73.