Patent GB-190721785-A (GB)
Title: Improvements in Machines for Forming Hollow Articles by Stamping Finely Divided Material.
Inventor: BONGARDT ERNST
Filed: 1907-10-02
Granted: 1908-02-27
Abstract: 21,785. Bongardt, E. Oct. 2. Moulding hollow-ware.-In tamping-machines for producing cement pipes &c., means are provided for varying the feed and tamping according to the shape and thickness of the article to be produced; means are also provided for roughening the material behind the stamps so as to ensure adhesion of the next layer. Fig. 1 shows a machine in which material is forced from a hopper 16 by means of a screw 19 through a pivoted funnel 17 into a mould 41, and is tamped by a stamp 29 carried by a rod 30, which is raised and dropped intermittently by means of a cam 32. The cam 32, Figs. 1 and 5, is slidably mounted upon and rotated by a shaft 33 driven by a shaft 7 through bevel-gearing 36, 35 ; the shaft 7 is driven by a friction wheel 4 engaging with a friction plate 3 mounted on the main shaft 2. A friction wheel 5, mounted on a shaft 8 co-axial with the shaft 7, is also driven by the plate 3, and drives the screw 19 by means of gearing 28, 27, 24, 23, 22. The hopper 16 and the guide 31 for the stamp 29 are carried by a frame 10, which is mounted on wheels 14 running on a circular track 15 and rotated from the friction plate 3 by means of a friction wheel 6 and spur gearing 13, 12. The mould 41 is run into position along rails 39, and is accurately centred by means of a rod 42 which is coupled to the end of the shaft 7 by means of a screw nut 43. The stamp guide 31 and the mouth of the pivoted hopper 17 are constrained to follow the median line of the mould by means of rods 49, 46 carrying pins engaging with a cam-groove 45 in a pattern plate 44 secured to the rod 42. The friction wheels 4, 5, 6 are movable along their shafts so that their position with regard to the plate 3, and hence their rotation, can be varied ; the wheel 6 is adjusted by meaus of a lever 53 connected to a hand-lever 51 ; the wheels 4, 5 are adjusted by means of levers 64, 67 connected to pins 63, 66 working in a cam 54 which is rotated by chain gearing 60 from a shaft 57 driven by worm gearing 55 from the shaft 11 of the frame 10. To ensure the adhesion of the successive layers of material, a roughening-device 69, Fig. 5, is mounted behind the stamp 29. Fig. 6 shows a modified form of machine in which the friction plate 3, Fig. 1, is replaced by an horizontal friction plate 74 driven from the main shaft 2 by worm gearing 72. The feed hopper 76 is provided with a central portion 75, which supports the friction plate 74 and also carries a bevel-wheel 85 gearing with a bevel-wheel 84 mounted upon a shaft 83 driven by means of a friction wheel 82 engaging with the plate 74. Friction wheels 86, 94, driven by the plate 74, actuate the stamp 29 and feeding-screw 19 through bevel-gearing, and the amount of tamping and feeding are controlled by means of a cam 101 mounted on the central portion 75 of the hopper 76. A series of stamps and feeding-devices may be employed, a series of cam-grooves being formed in the plates 101, 44 to control the tamping and feeding. Fig. 8 shows a modification in which the amount of tamping is regulated by adjusting the height to which the stamps are raised ; the stamp rod 30 is raised by means of a counterweighted gripping-lever 113 operated by means of a crank 117, and is released by means of a stop 124 which is adjusted by means of a cam 126 and connecting- levers 127, 128, 129.