GB815209A - Improvements in delivery boxes for pneumatic conveyor devices - Google Patents

Abstract

815,209. Feeding tobacco. KORBER, K. July 30, 1957 [Sept. 10, 1956], No. 24100/57. Class 130. [Also in Group XXX] In a delivery box for a pneumatic feed system for tobacco &c. wherein the suction pipe 5 is horizontal and parallel to the feed pipe 6 and to the screen 2 between the suction chamber 3 and the supply chamber 4 and the two pipes are connected in mutually off-set manner to the opposed ends of the box in such manner that the lower surface part of the pipe 5, the upper surface part of the pipe 6 and the screen lie in closely adjacent planes, the suction chamber 3 and the screen are extended at 3a and 2a to a suitable extent in the region of the pipe 6 to ensure that the box is filled completely before the delivery flap 13 is actuated. A feeler 7, which is pivoted to the wall 10 of the box 1, moves counterclockwise as the box fills and moves the arm 11 to actuate the switch 12. A control valve 16 and a throttle valve 17, both of the butterfly type, are arranged in a part 3b of the chamber 3. Control surfaces 22, 23 secured at right angles to the valve 16 close auxiliary air openings in the bottom of the part 3b as the valve rotates. The valve spindle 18 carries a chain wheel 24 around which passes a chain 25. One end of the chain is connected to the core 26 of an electromagnet 27 and the other end is fixed to a tension spring anchored to the base 28. When the chamber is full, the feeler 7 actuates the switch 12 and the circuit of the magnet 27 is opened. The spring rotates the spindle 18 and the valve 16 takes up the position in which the pipe 5 is cut off from the box. At the same time the auxiliary air openings are opened to connect the box 1 and pipe 5 to atmosphere, the delivery flap 13 opens and material is discharged.