Patent GB-313719-A (GB)
Abstract: 313,719. Northern Sabulite Explosives Co., Ltd., and Fawcett, T. C. May 8, 1928. Endless-chain conveyers with articles held by grips; discharging devices; grips and clips, operating; carriers for transferring and depositing articles.-An endless conveyer suitable for use in the hermetic sealing of explosive cartridges or shots for excavating comprises a band or chain carrying a series of grippers, means for feeding each article individually to a point adjacent the conveyer, means for causing each gripper as it passes this point to grip an article, and means for causing each gripper to release its article as it passes another point. The chain 2 is passed round sprockets 3, 4, 5 mounted in a frame 1 so that the conveyer has the form of a right angled triangle. A gripper 6, Fig. 6, is secured to each alternate link 2<a> by brackets 8, 8<a> on a base plate 7. Jaws 9, 10 pivoted to the base plate are drawn together by a spring 11 and provided with cam arms 9<a>, 10<a> adapted to engage with cam members 17, 18 and 19, 20 at the feed and delivery points, respectively. Projections 7<a>, 7<b> on the plate 7 engage vertical guides 13, 14 and 15, 16 arranged parallel to the chain at the feed and delivery points, respectively. The cam members are pivoted near their upper ends, and after adjustment are locked in position by set screws which engage arcuate slots in the guides. The shots 23, which are cylindrical. in form and wrapped in paper, pass down an inclined trough 24, and are received singly in recesses 22a in a feed wheel 22 driven by the conveyer which carries them to the grippers. The cams are arranged to open the jaws sufficiently to allow them to pass into the ends of the recesses and over the ends of the shots and to keep them open until the axis of each shot is in line with the ends of the jaws, whereupon a quick engagement occurs and the shot is transferred to the conveyer. Spring guide members 24a at the sides of the wheel keep the ends of the wrappings closed until they reach the grippers. A loose roller 25 prevents the shots from mounting up near the feed wheel. In order that the wheel may take shots of various diameters, the recesses 22<a> are undercut to receive adapters 33. The shots become coated with wax on passing through'a steam jacketed tank 35 arranged below the sprocket 5. The conveyer is of such a length that the wax is set by the time the shots arrive at the unloading cams which discharge them on to the shoot 21. Superfluous wax is shaken off the shots and jaws by tapping the chain with a leather-covered weight 42, Fig. 7, carried by an arm 41 which is actuated by cams 38 on the shaft of the sprocket 5. In a modification the adapters 33 are dispensed with, and the wheel is moved towards or from the conveyer when different sizes of shots are to be dealt with. In a further modification, the wheel is free and is turned by the grippers. In the modification shown in Fig. 8, the feed wheel 43 has a number of radial recesses 44 in each of which is located a V-block 45 having a pin 46 projecting from its underside through a hole in the rim of the wheel. A shaped block on each pin abuts against one of a series of cam surfaces 47a formed on a disc 47 which mav be turned to adjust the blocks 45. The jacket of the waxing tank 59 communicates with pipes 53 bent to a zig-zag form and supporting brushes 54, 55 which remove superfluous wax. This wax is led back to the tank by a drip platoe 56.