GB717854A - Improvements in or relating to methods of and machines for moulding or shaping glassarticles - Google Patents

Abstract

717,854. Glass manufacture. BRITISH HEAT RESISTING GLASS CO., Ltd., and HANN, D. G. Feb. 5, 1953, [Feb. 5, 1952.] No. 2980/52. Class 56. In the shaping of glass articles by pressing, the gob is guided into a mould body by a gobembracing and positioning member which is separate from the mould body and is withdrawn from the mould body, as mould and member move in unison towards the pressing position, by a relative vertical movement between the member and the mould body, this withdrawal being followed by a lateral separation whereby the pressing die may descend, without obstruction, into the mould body. In Fig. 1, the mould bodies 89 are mounted in groups, each group being rotatable about a vertical column 133 and the groups being rotated collectively around a central axis, as described in Specification 717,853. The gob-positioner 130 is funnel-shaped and is mounted on an arm 135 adjustable in all directions on, or with, a sleeve 154 vertically slidable and rotatable on the column 133. A sleeve 155 encircles the lower part of the sleeve 154 and is coupled by a key 161 on a bracket 160 on the sleeve, with one of a number of vertical slots in a ring 162 which is concentric with the column 133 and rotates' with the sub-table 70 carrying a group of mould bodies 89. The key 160 is raised out of its slot to interrupt the drive between the rotating moulds and the guide 130, when the guide has been raised sufficiently to clear the top of the mould, this being effected by a stationary cam track 136 engaged by a follower 137 on a lug 166 on the bracket 160. The cam track may be designed to produce a uniform rate of rise, or the rate of rise may increase progressively. The guide is returned to its initial position by a toothed rack 168, which is actuated by a hydraulic ram controlled as described in Specification 717,853, operating the pinion 139, which is fast on the sleeve 155, through an idler wheel. The guide is thus cleared from the mould before the descent of the die 100. A hand lever 169 operates a thrust rod 168a engaged under the pinion 139 to permit the guide to be raised manually. The upward thrust of the sleeve 155 is transmitted to the sleeve 154 by an arm 156 on the sleeve 155 abutting against an arm 157 on the sleeve 154, the two arms being coupled, in a selected angular relationship, by an eccentric adjusting and clamping means 193. The descent of the guide 130 into the mould, when permitted by registration of the key 161 and a slot in the ring 162, is cushioned by an oil-filled dashpot in an axial cavity at the upper end of the column 133. The guide is replaceably secured on the arm 135 by a bolt 193a; is vertically adjustable by the screw 182, and the arm 135 is adjustable along its own axis by manipulation of screws 180, 181, which are threaded in oppositely disposed lugs on a cam-like rocking lever pivoted to the arm and engaging a fulcrum cavity in a guide block, for the arm 135, carried on the sleeve 154.