PNEUMATIC MACHINE FOR THE LEAK-TIGHT CLOSURE OF FLASKS

摘要

A skirted stopper is inserted into the neck of a flask within a shielded enclosure and the skirt is folded-back outside the neck to form a leak-tight seal by means of a machine comprising a flask receptacle surmounted by a hollow casing which contains a number of pistons in interfitting relation. Admission of compressed air into the casing by remote control means results in displacement of a main piston, a central plunger and a hammer rod which inserts the stopper; a separator piston provided with flexible extension strips projecting from the casing and surrounding the hammer rod is then displaced downwards to initiate reversal of the skirt; a releasing piston having flexible extension strips which surround the strips of the separator piston is then displaced downwards to complete reversal of the skirt which is applied against the neck, whereupon the pistons are returned upwards automatically and simultaneously by remote control of the compressed-air supply.