Patent GB-408707-A (GB)
Title: Improvements in or relating to the removal of pressure bags or the like from tyre covers
IPC: B29D30/06
Filed: 1932-10-27
Abstract: 408,707. Removing pressure bags from tyre covers. DUNLOP RUBBER CO., Ltd., 32, Osnaburgh Street, London, and WILLSHAW, H., Fort Dunlop, Birmingham. Oct. 27, 1932, No. 30104. [Class 70.] Apparatus for removing pressure bags from tyro covers comprises a conveyer characterized by tho provision of a number of units each adapted to support a cover and each comprising means for spreading apart the beads thereof. As shown the conveyer comprises a chain 1 to which are fixed units 3 each of which comprises a pair of hooks 6 pivotally connected to a bracket 13 fixed to a boss 12 integral with the lower end of a supporting member 11. Each unit carries a roller 5, which runs on the upper surface of a rail 2, and a roller 23 which is pressed against the under surface of the rail by springs 21 attached at their upper end to the bracket 13 and at their lower end to the head 9 of a plunger 8 which carries the roller 23. As the unit moves past the sloping part 10<a> of the rail the plunger 8 is depressed and bears on the tread of the tyre, thereby splaying out the beads 7. This splaying action is facilitated by the pull exerted by the hooks 6 the ends of which have been inserted under the beads and which are spread apart by the toggle action of links 15 pivoted to a sleeve 16 secured to the plunger ; the hooks are pushed outwards by bosses 17 on the links and later pulled inwards by the hooked ends 19 of the links. The beads may be spread at a plurality of points or evenly around the whole circumference and may be separated wholly by the pressure of the head or wholly by means of the hooks. The lower end of one of the hooks is shown hinged at 22<a>; it may be hung up on a catch 24. The beads now being opened, the pressure bag is levered out at one point by means of a hand tool, tongue-pieces 32 being provided on one of the hooks 6 to act as a fulcrum for the tool, and a strap 29 is passed between the cover and the bag. Through eyelets 30 at the end of the strap is passed a hook 36 connected to a plunger 33 working in a fluid pressure cylinder 34 balanced by a weight 39 and spring 40. The plunger is retracted by fluid pressure and pulls the bag out of the cover. The plunger may rock vertically and swing horizontally by reason of the cylinder 34 being mounted on a horizontal pivot 37 and a bearing 38 ; motion-limiting means may be provided. The coaction of a wheel 42 with a rail 41 keeps the system at the correct angle during operation. The plunger 33 is fixed to a wheeled carriage 43 reciprocating on a runway 44 fixed to the cylinder. The units are kept steady by being connected together by chains 25 and by wheels 26, mounted on extensions of the brackets 13, which run between guide rails 27. The device for pulling out the pressure bags may instead of pivoting move to and fro along a runway, or it may be associated with the conveyer itself, and its motion may be automatically synchronized with the motion of the conveyer. Instead of a strap 29 may be used a hook operated automatically and by means associated with or operated in sequential relation to the conveyer. The cam means 10<a> may be replaced by gearing operated in synchronism with the conveyer.