Patent GB-372413-A (GB)
Title: Improved apparatus for delivering measured quantities of liquids
IPC: G01F11/02
Filed: 1931-02-12
Abstract: 372,413. Delivering measured quantities of liquids. POUDEROUS, J., 70, Avenue Valioud, Ste.-Foy-les-Lyon, Rhone, SAMSON, E., 10, Rue DuperrÚ, Paris, and ROBILLARD, J., 6, Rue Collas, Boulognesur-Seine, all in France. Feb. 12, 1931, No. 4437. Convention date, Feb. 12, 1930. [Class 106 (v).] In apparatus of the type in which a piston 23 displaceable in a measuring chamber 4 frees at the ends of its stroke a locking device for the hand-operated cock 3, the locking device 18 is adapted to be turned by the cock and is urged axially by springs 19, 20 into notches 5b provided in the fixed casing of the apparatus and corresponding to the admission and emptying positions. The transparent measuring chamber 4 is adapted to be rotated with the cock 3 by a, handle 9a and is mounted between an upper bearing 5 and a lower bearing 2 in which are formed the inlet, outlet and compressed air passages. A square rod 14 is adapted to slide in an opening at the upper part of the measuring chamber and carries the locking collar 18 having a pair of teeth 18a adapted to engage the notches 5b under the action of the balancing springs 19, 20. A flange 21 at the lower end of the rod 14 is engaged by a telescopic tube 22 fixed to the piston 23 to lower the rod 14 when the piston reaches its lowest position and free the lock 18. At the upper end of its stroke the piston abuts the end of the rod 14 to raise the lock 18 out of engagement with the notches 5b. In the filling position the liquid is forced from the supply tank 28a by compressed air supplied through a pipe 29a and passes through pipe 28 and passages 27, 30 to the measuring chamber, forcing the piston upwards. The air above the piston escapes through an external pipe and a passage 31 in the valve. In the emptying position, Fig. 4a, the passage 30 communicates with the discharge nozzle 26 and the channel 31 with the compressed air pipe 29 so that the piston is forced downwards by the compressed air. A spring 33a may be used in place of or in addition to the compressed air. A counter is actuated by the square rod 14 through a free-wheel 17. To vary the quantity delivered an adjustable screwed rod 24 is adapted to project from the lower end of the rod 14 to adjust the upper end position of the piston. The Specification as open to inspection under Sect. 91 (3) (a) comprises also means for preventing. fraud, means for expelling air from beneath the piston and registering and indicating apparatus. Oppositely directed pawls 35, 36, Fig. 6 (Cancelled), on the locking device 18 are adapted to engage fixed toothed sectors 39, 40 in the upper and lower positions of the locking device to prevent reverse movement of the cock. The locking device comprises a single tooth 18a on a hollow square rod 15 in which slides a rod 34 fixed to the piston 23 and having a head 34a adapted to operate the locking device at the ends of the stroke. A float valve may be provided in the piston 23 to allow escape of air through a non-return ball valve. The discharge nozzle 26 may have a spring-pressed valve for preventing drip. The counter may be arranged in the lower part of the apparatus and may be actuated by the piston 23 at the end of the discharge stroke through a lever engaging a spring-pressed collar 65, Fig. 14 (Cancelled). A mask 78 is adapted to cover the window 79 of the counter until the cock has been turned to refill the measuring chamber, the mask being operated by a cam 85 on the spindle 7 of the cock through a sliding member 83 and a lever 80. This subject-matter does not appear in the Specification as accepted.