Patent GB-439668-A (GB)
Title: Improvements in or relating to measuring apparatus
IPC: G01F1/50
Filed: 1935-03-18
Abstract: 439,668. Integrating - apparatus. BAILEY METER CO., 1050, Ivanhoe Road, Cleveland, Ohio, U.S.A.-(Assignees of Weaver, H. E. ; South Euclid, Ohio, U.S.A.) March 18, 1935, No. 8348. Convention date, April 23, 1934. [Class 106 (iv)] Comprises means for integrating a measure of a quantity compensated for a given condition by periodically stopping the integration for intervals dependent on said condition such stoppage taking place at constant periodicity. The up and down stream pipes 3, 4 on either side of the nozzle 2 of a flow meter are connected to the spaces inside and outside of a bell float 6 the movements of which are converted by the link 8 into a rocking about a fulcrum 7 of a recording arm 10 and an arm 9 pivotally connected at 14 to the end of a floating lever 26, a roller 27 on the other end of which rests on a cam 28 driven through bevel and worm gear from a constant speed motor 19. The arm 26 also carries a roller 25 adapted to engage a spring held arm 23 of a bell-crank pivoted at 24 the other arm of which forms a pawl engaging a ratchet wheel 21 on the driving shaft 16 of a counter 15. The shaft 16 is driven from the motor 19 through bevel gear and a friction coupling 20. When the ratchet wheel 21 is freed from the pawl 22 the shaft 16 and counter are driven and when the wheel 21 is held the coupling slips. The counter is then driven during a period determined by that portion of the time cycle of the cam 28 during which the roller 25 engages the arm 23 which is determined by the position of the point 14. To compensate for variations in static pressure, a pressure pipe 29 is connected to a Bourdon tube 30 which normally holds up a contact arm 32 clear from a cam 33 driven from a constant speed motor 13. The cam is connected through a brush 34 and conductor 35 to one terminal of the field 36 of the motor 19. The other terminal of the field 36, both terminals of the field 38 and the arm 32 are connected to the power source 37. The fields 36, 38 are equal and opposed. If the pressure falls below normal, the arm 32 can engage the cam 33 during which engagement the field 36 is energized and the motor 19 stopped during a portion of the time cycle of the cam 33. To compensate for pressure variations above as well as below normal, the speeds and gear reductions are so arranged that a maximum rate of flow at the designed pressure gives a totalization of register for say 80 per cent of the time cycle of the cam 28, and the contact arm 32 will engage the cam 33 for 20 per cent of the cycle. A further cam may be used in conjunction with a Bourdon tube responsive to temperature to compensate for temperature variations. In a modified form, an alternating current motor operates the counter driving shaft and the pressure compensating cam, the main flow cam being driven from the counter driving shaft which is provided with two piston couplings. In a further modification, temperature tubes are connected to a heating circuit at each side of a radiator and act on the same lever holding up the contact arm 32, the meter reading in British Thermal units. In a still further form, the field 38 of the motor 19 is controlled by the joint action of temperature and pressure responsive Bourdon tubes each controlling a separate motor which act on a differential gear positioning a contact bar 32 for the cam 33. In a last form the device is applied to a type of integrator involving a friction wheel which is traversed across a friction disc rotated at uniform speed.