Patent GB-190316235-A (GB)
Title: Improvements in Liquid Meters.
Inventor: BLAKISTON RALPH
Filed: 1903-07-23
Granted: 1904-07-23
Abstract: 16,235. Blakiston, R. July 23. Liquid meters.-Consists in apparatus for recording the rate of flow graphically at each and every instant, and the quantity of liquid passed, the records being made separately. A disc is mounted axially within a tapered delivery pipe, so that an annular space between these two parts allows the liquid to pass. The position of the disc thus determines the rate of flow of the fluid. For recording the flow of fluid while the disc is within the pipe, the disc may be directly connected to a frictionally-driven wheel which is made to travel along a radius of a rotating plate so as to be driven at a rate dependent on the position of the disc. When the disc travels beyond the end of the pipe, and the rate of flow of the liquid is not directly proportional to the movement of the disc, a cam-spiral or equivalent device is used to effect the movement of the wheel on the rotating plate. Fig. 1 (Sheet 3) shows the apparatus, in which the primary wheel a of the integrating- mechanism is mounted on a carriage a' running on rails d, and is driven by a plate b, which is driven at constant speed by clockwork. A cam e, Fig. 1 (Sheet 2), is mounted co-axially with a pulley f, which is connected to the meter disc by a wire or band f<1>, and the boss e<2> of this cam is made in the form of a drum. The cord g of the integrator carriage a and the cord h of the differentiating- mechanism marker are connected to this part of the cam, so they may be operated thereby when the disc is within the conical delivery pipe. When it is outside, the cords g, h are operated by the cam e, which is so formed as to carry the integrating-wheel to such a position on the rotating plate b that the angular velocity of the wheel will still be proportional to the flow The cord h passes under a guide-pulley h<1> to the pulley h<2>, and so acts upon the cord m<1> attached to the carriage of the differentiating- mechanism marker, which is made to slide horizontally on two rods n, the diagram being made on a sheet wound on a drum k. The cord g passes around the guide-pulleys g<1>, g<2>, as shown in Fig. 2 (Sheet 5), and back to the carriage a. To balance the friction and resistance on the apparatus due to the power required in bending or pressing down the cords g, h, a weight i<1> is attached to the periphery of a second cam i of corresponding form to the cam e. This cam is pivoted at i<3> and is operated by two toothed wheels j, so that, as the friction or resistance varies at different points of the cam e, the assistance or balancing effect, due to the movement of the weight i<1> about the axis i<3>, will correspondingly vary. Instead of a rotating plate, a uniformly-rotating cone, corresponding in shape with the conical delivery pipe, may be used to drive the integrating-wheel. A further means of changing the velocity ratio of the travel of the integrating- wheel and disc is to interpose a tapered vessel containing mercury. A float, upon the surface of the mercury, controls the travel of the integrating-wheel, while the level of the mercury is changed as the position of the disc changes. This may be effected by means of a plunger in the mercury actuated by the disc, and, by varying the figure either of the plunger or the vessel, any desired velocity ratio between the disc and integrating-wheel may be attained. The Provisional Specification describes a further modification in which the action of a curved or inclined former ' upon a roller carried by a pivoted lever is utilized to afford the desired change of velocity ratio. The movement of the lever is effected by the movement of the disc, while the roller carried by the lever and engaging the ' former' is connected with the carriage and integrating-wheel. In an alternative arrangement, the former' is directly moved by the disc, the roller being connected with the counter carriage.