Patent GB-837520-A (GB)
Title: Fuel consumption meter
IPC: G01F3/20
Filed: 1958-06-06
Abstract: 837,520. Liquid pressure meters. WURTT GASZAHLERFABRIK J. BRAUN & CO. G.m.b.H. June 6, 1958 [June 7, 1957; Aug. 5, 1957; Aug. 6, 1957; Oct. 7, 1957; Dec. 27, 1957], No. 18174/58. Class 69 (2). In an instrument for measuring the consumption of flowing liquids by means of a volumetric measuring mechanism operating according to the two-chamber principle with a movable diaphragm 3 which is actuated by the pressure of the liquid to be measured, and whereby in accordance with the reciprocating movements of the diaphragm suitable transmitting means act upon a counter mechanism which indicates and/or records the consumption of the liquid, the entire control mechanism including the drive mechanism 40-43 of the counter mechanism is mounted within a measuring chamber 5 of the instrument which is filled with liquid. The diaphragm 3 is mounted between housing parts 1, 2 (Fig. 2) and has secured to it a plate 7 on which a bracket 8 is mounted. A lever 10 provided with a loop-shaped guide member 9 is pivoted to the bracket 8. The pivotally interconnected ends of levers 11, 12 are slidably mounted in the guide member 9. The other ends of the levers 11, 12 are pivoted on shafts 40, 22 respectively. The lever 11 consists of two coaxial rods extending relative to each other by a compression spring 13. The lever 12 has a slot 14 which serves as a drag link for taking along a flat slide valve 15. The slide valve has a rounded bore 23 for the reception of a bushing 24 through which the shaft 22 passes. This shaft is carried by a valve plate 17 secured to the housing 2. A leaf spring 25 presses the slide valve 15 on to the valve plate 17. Stop pins 20 are mounted on the valve plate 47 to limit the pivotal movement of the valve member 15. Lateral projections 21 on the lever 12 are of such dimensions that they engage the stop pins 20 before the member 15 will do so. Consequently, when the lever 12 is in one of its end positions the valve member 15 is relieved of the load of the lever system 11, 12. The slot 14 ensures that the levers 11, 12 pivot not only at the angles which correspond to those of the valve member 15, but at an additional angle, with the result that, when lever 12 has passed beyond the central dead-centre position, it will, by the action of spring 13, carry out an idle stroke and then suddenly throw the valve member 15 toward the opposite end position by hitting against pin 16. The valve member 15 has two bores 26, 27 and two elongated recesses 28, 29 which serve for charging the supply and discharge flow of liquid into and from one measuring chamber or the other 4 or 5. Valve plate 17 is provided with bores 30, 31, 32 which coincide with channels 33, 34, 35 of an inner projection in the housing 2. Liquid enters the channel 35 through an inlet socket 37 and when the valve member 15 is in the position shown in Fig. I the liquid passes through the bore 32, elongated recess 29 and by-pass 34 into the measuring chamber 4. The liquid gradually pushes the diaphragm 3 toward chamber 5 until lever 10 reverses the valve member 15. The liquid will then be discharged from the chamber 4 by the by-pass 34, the elongated recess 28 and channel 33, while it will flow into chamber 5 through channels 34, 32 and 27. The bracket 8 also pivotally supports an arm 38 connected to a bracket 39 through which pawls 41, 42 will be actuated to rotate a ratchet 43 of a counter mechanism at each stroke of the diaphragm 3. In a modification shown in Fig. 8 the by-pass is formed by a plastic hose 63 fitted over a nozzle which is connected to the central bore in the valve plate and leads to the diaphragm 49. Plastic hoses also replace the bores 33, 35 in the housing. In a further modification shown in Fig. 13 an electromagnetic clutch 112 is connected to the counter mechanism.