Patent GB-566059-A (GB)
Title: Method of and apparatus for sealing jars and like containers
IPC: B67B3/24
Filed: 1942-11-20
Abstract: 566,059. Sealing jars &c. ANCHOR HOCKING CLASS CORPORATION. Nov. 20, 1942, No. 16436. Convention date, June 1, 1942. [Class 125 (ii)] Apparatus for sealing a cap on a jar &c. comprises means for supporting and guiding a cap into position over a jar &c. from a position not vertically above the jar &c., means for charging the air beneath the cap with a combustible fluid to form a combustible mixture and igniting the mixture while the cap is being guided into position and means for sealing the cap upon the jar &c. substantially coincidental with the greatest volume of the expanded burning gases. Jars &c. 75, already filled, are placed at random on to a conveyer comprising a pair of chains 11, extending through channels in the top plate 6 of the machine and driven by a sprocket 12. Caps 33, lying edge to edge in a shoot 32, are removed successively therefrom by contact between the forward edges of the jars and the lowermost cap in the shoot. At the bottom of the shoot there is provided a pair of adjustable spaced discs 52 carried by a spring 48 clamped at 49, the spring 48 resting on the nose 47 of a member 45 in its lowest position. The discs 52 act to press the cap towards the mouth of the jar &c. as it advances underneath, the cap being meanwhile guided by rails 81 extending along each side of the neck of the jar. Also positioned at the bottom of the shoot is a pivoted lever 56, the nose 46 of which is depressed when a cap passes. The depression of this lever opens a valve 73 to admit combustible gas to passages in a block 38 leading to the space between the cap and the head of the jar, Fig. 8. Also, upon depression of the lever 56, contacts 66 are made on the switch 59 to spark the combustible gas, mixed with air, filling the top of the jar beneath the cap. The explosion of the gas mixture and the expansion of the products of combustion is stated to result in the initial closuring of the jar &c. by the cap which is forced down by external air pressure. Before the explosion of the gas mixture, air was blown from a chamber 88, through a port 87, to displace any steam &c. from above the contents in the jar &c., the compressed air being supplied by a fan 109. While the lowermost cap is being taken from the bottom of the shoot 32, the jar &c. is held between pneumatic tyres 125 moving at the same surface speed as the conveyers 11 so to prevent tilting of the jars. The wheels 124 carrying the tyres are positively driven by a chain 132 and sprockets 131. After the initial sealing of the jar &c., the cap may be pressed upon the top of the jar by a wheel 134, carrying a resilient insert 135, positively driven at the same surface speed as the conveyers 11 by worm and worm-wheel gearing 149, 150. The wheel 134, the height of which is adjustable, is spring biassed to " give " to the jar &c. therebeneath. In place of the sealing wheel 134, a closuring chuck which deforms the flanges of the caps may be used. In a further modification, depression of the lever 56 opens the valve 73 to the flow of combustible gas from two nozzles directed towards the top of the jar &c. beneath the cap, the jets of gas being ignited by a pilot gas jet which burns continuously. In this modification, the wheels and tyres 124, 125 are replaced by two endless belts driven at the same surface speed as the conveyers 11, the belts being spring urged together to grip the jar &c. while a cap is being taken from the shoot. The motive power for the swivel units is derived from an electric motor 30 which drives the main multiple pulley 27. Specification 552,664 is referred tn.