US673173A - Water-meter. - Google Patents

Description

No. 673,173. Patented Apr. 30, I90l.

L. H. NASH.

WATER METER.

(Application Bled Feb. 15, 1900.) (No Model.) v 2 Shoah-Sheet l.

No. 673,173. y Patented Apr. 3o, |901.

L. H. NASH.

WATER METER.

(Application led Feb. 15, 1900.)

l (No Model.) 2 Sheets-Sheet 2.

mvENToR WITNESSES Y E $6 RJUARNEYS- UNTTE. STATES PATENT trice.

LEVISH. NASH, OF SOUTH NORWALK, CONNECTICUT.

` i WATER-METER.

SPECIFICATION forming. part of Letters Patent No. 673,173, dated April 3C, 1901`.

` Application filed February l5, 1900. Serial No. 5,351. (No handel.;

T0 @ZZ whom, it may concern:

Be it known that l, LEWIS H.'NASH, a citizen of the United States, and a resident of South Norwalk, in the county of Fai riield and State of Connecticut, have invented a new and Improved Water-Meter, of which the following is a full, clear, and exact description.

' My invention relates to that class of watermeters known as oscillating meters of the general type shown, for example, in Letters Patent Nos. 300,629 and 300,630, granted to me June 17, 1884; and it consists of certain `novel parts and combinations of parts specifically pointed out in the claims concluding this specification.

Reference is to be had to the accompanying.

stood that various modifications and changes may be made without changing the nature of the invention and without exceeding the scope of the claims. This meter contains in common with other meters of this class, as those shown in said patents, a casing composed of a ringA, heads B and C, having an inlet-port. E and an outlet-port F, an interior abutment B C', a diaphragm G, and a tubular piston D, workin g within said casing. The tube D,form ing the piston, is provided with a central web or disk D', in the usual manner, and this web carries a pin K, which is constrained to move in a circle by the roller L, journaled upon a central pin B2 upon the lower head, all as' shown in the above-mentioned patents. The movement of the piston is communicated to the registering mechanism by means of the upward extension of the pin on which the roller K is journaled, the same contacting with a horizontal arm on the spindle connected with the registering mechanism, (not showin) all in the usual way. The construction of the ports., however, differ materially -from that shown in my said patents. The theoretical maximum area of ports which might be used in this meter, allowing for a slight lap, is shown by the dotted lines E' and F. It will be noticed by comparison of the outline of the ports shown with these dotted lines that the inlet-port E is reduced in width from this maximum at the end near the diaphragm or that portion of the port which would bein use during the beginning of the inflow of water to the chambers formed between the piston and the walls A and B' of the casing. As a consequence ot' this, when the port begins to open for the inflow of water its area is relatively restricted-that is, the area of the port relative to the rate of increase in volume of the inlet-chamber is smaller at this point than itislater, as can be seen from an inspection of Fig. 3, with reference to theinnerinletorfilliugchamberH. Thesame condition occurs in connection with the filling 'of the outer inlet or filling chamber H'. As the piston swings or moves to later positions the eective area of the inlet-port l-I increases fasterrthan the volume of the chamber, so that the pressure in the inlet-chamber rises as the piston passes through its successive phases. In the position of the piston shown in Fig. 3 the portfor the inlet-chamber H has not'yet been uncovered and the chamber is beginning to enlarge. The only inlet for water thereto is by leakage past the joints, which results in a very slight pressure within the inner chamber H. At the same time the inlet-port for the outer chamber H is relatively large and the pressure therein is substantially equal to that of the supply. The conditions are reversed on the outlet side, Where auxiliary ports are provided next to the diaphragm G, so as to relatively increase the eective area of the port during the latter part of the discharge from each discharging-chamber. This is done by forming a notch or recess in the central abutment B and by providing aport through the outer wall A next to the diaphragm and opening into the discharge-passage J. The' outlet-ports for the discharge chambers I and I are relatively large, being augmented next to the diaphragm by the auxiliary passages fand f which reduce the pressure in these chambers when approaching zero. It will be observed that I have also IOO , chamber.

y away from these walls.

improvements the piston is relieved of excessof construction the inlet-port open at the lat-v ter part of the filling period of a chamber (see Fig. 4) is larger than the outlet-port open at the early part of the discharge period of a (See Fig. 3.) As a result of these facts the piston D is held in close cont-act with the two Walls A and B of the casing, so

las to secure a tight joint and prevent leakage. It will be seen that as a result of the construction described the resultant pressure of the Water upon the piston acts to hold the piston tightly against the Walls of the case to prevent leakage instead of holding it off o r As a result of these ive strains and friction and in consequence Works ymore freely and accurately and is more enduring. It is further t0 be observed that if in any position of the piston the pressures present on inlet or outlet side tend to lift the piston out of contact these can be diminished or neutralized by cutting paths for the water through the Wall of the piston or in theheadplates c ornmunicating between inlet-chambers, respectively, or between outlet-chambers, respectively, and that an unnecessary excess of pressure yin thev desired direction may be diminished by the same expedient. h

In Fig. 2, which shows the meter in section, it is seen that there is an inner and an outer case, the inner case consisting of ring A and heads B and C, forming the measuring-chamber, and the outer case consisting of the case M and cap N. The water enters through the pipe connection m and is discharged 'through the pipe connection m. The `case M hasa dependingi'ange terminating in an inward extension, forming a ledge O', upon which is placed a screen O, which may be of perforated metal, Woven Wire, or other suit- 'able material. This screen is held in place by legs b, which depend from the head B and engage thek top of the screen to hold it down rupon the ledge O. A ring b may be attached to the lower ends of the legs b and extend partially or entirely about the circle of the case. This device serves as a cheap and easy means for holding the screen in place. The inner case or measuring-chamber drops into position in the outer case and is held in place bythe cap N, bearing upon the head C. By removing the cap N the measuring-chamber and the screen maybe readily removed.

Having thus described my invention, I claim'as new and desire to secure by Letters Patentl. A meter having a tubular piston With a motion of oscillation combined with a case having tubular Walls, an interior abutment and a iXed diaphragm extending between .said abutment and case, said case being provided with ports, the outlet-port nearv said diaphragm being in width greater than the inlet-port near said diaphragm whereby the effective port area ofthe outlet-port at the latter part of the discharge period of a chamber is greater than the eective port area of vth'einlet-port at the early partof the iilling period of a chamber.

2. A meterhaving a tubular piston with a motion of oscillation combined with a case having tubular walls, an interior abutment and a fixed diaphragm extending between said 4abutment and case, said case being provided with ports, the outlet-port being of less circumferential length than the inlet-port, .whereby the effective port area of the inletport at lthe latter part of the iilling period of O a chamber is greater than the eective port area of Athe outlet-port atV the early part of `the discharge period of a chamber.

3. A meter having a tubularr piston with a motion of oscillation combined with a case having tubular walls, arcentral abutment and a xed diaphragm extending between said abutment and case, said c ase being provided with ports, the inlet-port beingless in radial Width and greater in circumferential length than the outlet-port.

In testimony whereof I have signed my nameL in the presenceV of two subscribing Witnesses.

LEWIS H. NASH.

Witnesses:

JOHN H. NoRRIs, HENRY O. SCHADE.`

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