Patent GB-1140120-A (GB)
Title: Process and apparatus for inserting stoppers into cartridge-syringe units
IPC: A61M5/00
Filed: 1966-11-28
Abstract: 1,140,120. Stoppering; stoppers. AMERICAN HOME PRODUCTS CORP. 28 Nov., 1966 [10 Dec., 1965], No. 53116/66. Heading B8T. [Also in Division A5] A resilient stopper 250, Fig. 9A, is forced into the funnel-shaped end of a tube 256 by a piston-rod 269 so that it is radially compressed, at the same time as the tube is lowered into the upwardly-facing mouth of a liquid-filled hypodermic cartridge 19; as the tube 256 is lowered, air escapes through the gap between it and the cartridge wall. The stopper 250 is pushed to the bottom of the tube 256, which is lowered until it is just above the liquid level 268, Fig. 9B (not shown). The tube 256 is raised relatively to the stationary piston-rod 269, thus forcing the stopper 250 out of the tube end so that it expands to seal the cartridge 19, Fig. 9C (not shown). Finally, the tube 256, &c. is withdrawn from the cartridge 19, to be positioned over another filled cartridge. Reciprocation of the tube 256 is effected by a rotary cam drum 14, Fig. 1, having a cam groove 238 engaged by a follower (273), Fig. 7 (not shown), on a vertically-movable slide (279), and reciprocation of the tube 256 is similarly caused by a cam groove 239 on the cam drum. The whole apparatus is mounted on a support 9 above an intermittentlyrotated table 8 carrying the hypodermic cartridges 19. A motor 3 drives through the gearing shown to gears 88, &c. and to the cam drum 14 to effect the stoppering. Cartridge feed.-The gear 88 drives through cam and link mechanism 119, 117 to a piston feed 16 which delivers one empty cartridge 19 at a time horizontally from a hopper 15 and pushes it into a holder tube 158 provided with internal friction fingers. The cartridge 19 is thus held within the holder tube 158, which is, turned from the horizontal position shown to the vertical position by rotation of a cam drum 12 having a cam groove 139 engaged by a follower (149), Fig. 5 (not shown), on a reciprocal slider connected at its lower end by linkwork (154, &c.) to the holder tube 158. The latter pivots to the vertical position, when it lies below a piston-rod (169). A second cam groove 138 on the drum 12 acts through a follower, and through rack-and-pinion gearing 179, &c., to slide the piston-rod (169) downwards, so that it pushes the hypodermic cartridge 19 out of the holder tube 158 and into a hole 56 in the intermittently-rotated table 8. An automatic cam-controlled catch 58 engages a shoulder between the body and the needle of the cartridge 19, and prevents its falling through the hole 56. Continued rotation of the cam drum 12, which is driven from the gear 88, withdraws the piston-rod (169) and pivots the holder tube 158 back to the horizontal position shown, ready to receive the next cartridge 19. Filling.-The table 8 is next rotated to carry the cartridge 19 to a filling station, where liquid is pumped into its open upper end. On further rotation of the table 8, the stopper 250 is inserted, as already described above. Stopper feed.-Stoppers 250 are fed by a vibratory mechanism from a hopper (17), Fig. 2 (not shown), through a guide 17<SP>1</SP>, Fig. 9A, to the stoppering mechanism. Cartridge removal.-Following withdrawal of the stoppering tube 256, &c., as described above, the table 8 is again rotated. A non-rotating cam 66 releases the catch 58, allowing the stoppered cartridge 19 to fall through the hole 56 in the table into a removal shoot (69), Fig 2 (not shown). As the table 8 rotates onwards, the catch 58 is returned to its operative position. Stoppers.-Each stopper 250 has a series of compressible ribs 251 around its circumference and a metal stud 253 embedded in and protruding from its top end.