Patent GB-530203-A (GB)
Title: Improvements relating to conveyor control devices
IPC: B65G47/48
Filed: 1939-06-30
Abstract: 530,203. Endless-chain conveyers. NEW CONVEYOR CO., Ltd., and SMITH, J. V. June 30, 1939, No. 19054. [Class 78 (i)] In conveyers of the kind provided with tiltable trays which are caused to tilt automatically to discharge the load at points pre-determined by the attendant, the position at which a tray is tilted is determined by a control member comprising a pair of parts capable of relative rotational and sliding movements respectively, the member being movable into an inoperative position to any appropriate extent by the attendant and being returnable into an operative position by a succession of unit movements effected at different positions along the conveyer track. Each tray g, Fig. 8, is held in horizontal position by trip mechanism l which is released by a pull on a cable h imparted by an arm 7, Fig. 1. This arm is secured to a sleeve 4, Fig. 2, which is mounted rotatably on a sleeve t in operative connection with the threaded portion s of a spindle k. The connection is effected by a member 9 which is slidable in a groove 10 in the sleeve and along the thread s, and in one position is engaged by a stop on the spindle. The spindle is rotated to set the apparatus by a knob m and carries a dial n bearing numerals corresponding to the discharge positions. Accidental movement of the spindle is prevented by a spring q which engages recesses in a disc p. A toothed wheel r is secured to the spindle k and is engaged by a pin 23, Fig. 4, mounted in a pair of arms 21 which are pivoted to a plate 13. This plate is pivoted to the casing at 15 and is connected to a similar plate by a transverse member 14 which forms an abutment for a plunger 26. The second plate 13 has arms 22 pivoted to it which carry a pin 23. A cam u secured to the sleeve t has a peripheral portion v concentric with and of the same radius as the wheel r. Another cam w secured to the sleeve t also has a portion x of its periphery concentric with and of the same radius as the toothed wheel r. A notch y in the portion x corresponds in shape to the space between adjacent teeth on the wheel r. A spring z tends to maintain a shoulder 2 on the cam w in contact with an abutment 3 on the casing. A radial arm 5 secured to the sleeve 4 has one side of its outer end 6 shaped to resemble the notch y. A ramp 12 is provided on the conveyer track a at each discharge point. As each carrier passes a ramp, the plunger 26 is depressed by the action of the ramp on the arm 18, and the toggle levers 13, 21 and 13, 22 are actuated against the action of a return spring 19. When the parts are in the position shown on the drawings, the pin 23 on the arms 21 can engage the wheel r, but the other pin 23 is prevented from engaging the end 6 of the arm 5 by the portion x of the cam w. Consequently when the plunger 26 is depressed, the wheel r is moved through a predetermined angular distance in a clockwise direction, and this movement is communicated to the sleeve k. which carries the sleeve t with it. The movement of the sleeve t moves the cams u, w so that the notch y is brought into alignment with the end 6 of the arm 5, and the shoulder 2 is moved away from the abutment 3. The next depression of the plunger 26 causes a further rotation of the wheel r and movement of the arm 5. The movement of the latter is transmitted through the sleeve 4 to the arm 7 and the tray is released.