Patent GB-445905-A (GB)
Title: Improved method of, and means for, the manufacture of moulded glass-ware
IPC: C03B11/06
Filed: 1935-02-19
Abstract: 445,905. Glass manufacture. BRITISH HEAT RESISTING GLASS CO., Ltd., and GELL, P. V. W., Vesta House, Lodge Road, Birmingham. Feb. 19, 1935, No. 5380. [Class 56] A mould for pressing a glass article which has an undercut projecting part, such as a knob or handle, comprises a divided portion arranged within an opening in an undivided portion, the two portions being movable relatively to one another to allow the separation of the parts of the divided portion when removing a finished article. The Figure shows a mould for pressing a dish lid 1 having an integral handle 2. The mould comprises an undivided body 3 which is formed with a central conical hole 4 containing the two parts 5, 6 of the divided portion. The outer surface of this portion is also conical, as described in Specification 445,915, so that the moulding-pressure presses the parts 5, 6 tightly together. The two parts 5, 6 are hinged to one another at 8 and are provided with extensions which are formed with a conical recess 13 and a conical outer surface 64. A plunger 20 and a ring mould 19 co-operate with the mould. The device for removing the finished articles comprises a pin 47 which is coaxial with the mould and is movable vertically through bearings 48, 49. The lower end of the pin is provided with an adjustable collar 50, and its upper end is provided with a head 51 having a conical nose 52. A collar 57, which slides on the pin 47, carries a sleeve 55 that surrounds the head 51, and a lever 63 engages trunnions 58 on the collar. A spring 56 separates the head 51 and the collar 57. In operation, after an article has been pressed and the plunger 20 raised, the ring mould 19 is removed and the pin 47 is raised by means of the lever 63. The conical nose 52 enters the recess 13 and lifts the parts 5, 6 of the divided portion of the mould, with the finished glass article 1, out of the undivided portion 3 until the collar 50 is stopped by the lower bearing 49. Continued movement of the lever 63 then compresses the spring 56 so that the sleeve 55 continues to raise the parts 5, 6. The upper edge 65 of the sleeve, however, engages the conical portion 64 and causes the two parts 5, 6 to open, thus allowing the article 1 to be removed. The divided portion of the mould may be kept stationary, the body portion 3 being lowered to permit removal of the finished article. The body portion may also be made of two rings fitted one within the other, the lower ring being lowered when the divided part is to be opened. The two parts of the divided portion may be movable rectilinearly instead of being pivoted to one another. A number of the moulds may be mounted on a table 14 which can be turned by hand to bring the moulds successively below the pressing plunger and over the lifting-pin 47. The moulds are held accurately in the operating positions by a pedal-operated bolt 27 which engages projections 25 on the edge of the table. The moulds may be mounted on a stationary table, the pressing plunger, and the parts for removing the finished articles, being moved from one mould to another.