Patent GB-253107-A (GB)
Title: Improvements in or relating to apparatus for delivering liquid in measured quantities
IPC: B67D7/16
Filed: 1926-05-31
Abstract: 253,107. Soc. Hardoll. June 5, 1925, [Convention date]. Multiple-chamber apparatus with discharge by separate fluid. - Apparatus for delivering measured quantities of liquid, particularly carburetting liquid, is fitted with a compressor supplying air or gas wherewith to accelerate the discharge of the measuring-vessels, the compressor being designed to function alternatively as a pump for the liquid. Fig. 1 shows an apparatus comprising two measuring-vessels 1, a pump 2 supplying a carburetting agent, and an air compressor 3. The pumps 2, 3 are actuated by a hand-lever 4 and rack 6, and the piston 7 actuates valves 8, 9 by means of a lever 11 and a quadrantshaped lever 12 adjustably connected to it. The apparatus is shown in combination with a compressed-air reservoir 53, by means of which the pump 3 may function as a motor. In this case a valve 54 is opened, and compressed air enters the pipe 8, closing the air inlet valve 56, and entering the valve chest and the cylinder 3, the exhaust from which passes by the conduit 10 to the measuring-vessels 1. If the reservoir 53 is not to be used, the valve 54 is closed, and the pumps actuated by the hand-lever. Air is drawn through the valve 56, and passes the valve 57 to the vessels 1. A safety-valve 58 is fitted. To ensure that the slide valve 8, 9 comes to rest only in its admission and discharge positions, the levers 11, 12, Fig. 2, each of which consist of two parts as shown, are relatively movable on their pivotal shaft 13, and a spring 13<1> tends to keep them in one relative position. When the lever 11 is moved, the lever 12 is retarded by a spring-pressed bolt 15 in a support 16. This bolt has a finger 18 which co-operates with a cam surface on the lever 11, and lifts the bolts 15 out of one or other of two notches in the lever 12, and frees the lever, which is thrown over by the spring 13<1>. The rod 14 and the valves 8, 9 on it are moved by the finger 12<1> between collars 12<2> on the rod. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following devices for similarly controlling the valves. (1) Fig. 4, (Cancelled). The levers 4, 11, 12 resemble those above described, and a spring lock bolt 22 with an opening 24, coacts with fingers 25, 26 on the lever 12 and projections 27, 28 on the lever 11, so that the lever 12 is restrained from following the lever 11 until the projection 27 comes into contact with the bolt 22, which is then moved, releasing the finger 25 and the lever 12, and bringing the finger 26 into position for engagement with the opening 24. (2) Fig. 5, (Cancelled). The levers 11, 12 are connected by a spring 13<1>, and on the lever 11 are a circular cam surface 29 and adjacent to it a T-shaped projection 30 on an axis parallel to the pivot shaft 13. When the lever 11 moves to the right the lever 12 is restrained by the shank of the T-shaped projection 30 until the cam surface 29 clears the projection, which is then rotated by the strained spring 32; this frees the lever 12, and throws over the valve 8, 9. (3) Fig. 6, (Cancelled). The piston rod 7 has a projection 34, and the valve rod 14 has an elbow 33, between which is fitted a member 35 pivoted on an axis 36 parallel to the rods 7, 14, and formed with a cam surface 38. As the rod 7 moves to the right the projection 34 and surface 38 coact and oscillate the member 35 until a projection 37 on its underside is swung out of the path of the elbow 33, when the spring 13<1> pulls over the valve rod 14. (4) Fig. 7, (Cancelled). The piston and valve rods 7, 14 slide in a block 39, and have box-like heads 40, 41 containing a spring 42 which is unstrained when the heads 40, 41 are exactly opposite one another, as shown. When the rod 7 is moved to the right, the recess 44 leaves the ball 43, and the spring is compressed, tending to move the rod 14 to the right. The ball 43 is however, locked in a recess 46 in the rod 14, and prevents it from moving until the rod 7 has moved so far that its recess 45 is over the ball, which is thus freed; the rod 14 being thus released, the spring moves it until the ball is in the recesses 45, 47. The ball 43 may be replaced by other locking-devices, such as a bolt. This subject-matter does not appear in the Specification as accepted.