US 691904 A
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UNITED STATES PATENT DAVID VERNER HALLBERGI-I, OF STOCKHOLM, SXVEDEN.
SPECIFICATION forming part of Letters Patent No. 691,904, dated January 28, 1902.
Application filed August 20.1898. Serial No. 689,105. (No model.)
To LtZZ whom itmcty concern.-
Be it known that I, DAVID VERNER HALL- BERGH, a subject of the King of Sweden and Norway, and a resident of Stookholm,Sweden have invented a new and useful Improvement in Water-Meters, of which the following is a specification, reference being had to the drawings accompanying and forming a part thereof.
This invention relates to an improvement in water-meters, and has for its object to secure the automatical emptying of the meter as soon as the inlet-pipe is shut off. It is well known that there is always the risk that the meter could freeze asunder if it is not emptied when the inlet-pipe is closed. Even if the meter be provided with a separate valve or the like to be actuated by hand the safety is nevertheless very small, as it is known by experience that the valve will be often left in its closed position when the inlet-pipe is shut off either on account of inattention or carelessness. According to this invention the water-meter is provided with an air-valve which cooperates with the closing valve, so as to open as soon as the latter is closed.
The invention consists, briefly, in providing a small valve in the upper part of the meter, said valve being so connected with the inlet-valve of the meter that when the latter valve is closed the former will be caused to automatically open a small communication between the inside of the meter and the outside, so that the air will have a free entrance into the meter and the water will be able to escape, the bottom of the meter being suitable for this purpose.
One way of carrying out the invention is shown in the accompanying drawings, in which- Figure 1 shows a longitudinal section of a water-meter constructed according to this invention, and Fig. 2 shows a part plan view of the same.
In this water-meter the driving and registering mechanisms are constructed in the ordinary way; but the meter differs from those hitherto known that an air-valve, which may be suitably formed by a valve-plate b or the like secured to the inner end of a movable bar a, is actuated by means of the said bar ct and by a cam or projection c on the spindle c of the inlet-valve in such a manner that the bar a is forced inward and the valve I) opened when the inlet-valve is closed. The valve-plate b in its closed position covers the inner mouth of a channel d, communicating with the outer air, through which channel the air may stream into the meter, so that the meter is emptied when the inlet-valve is closed. Around the outer end of the bar a there is applied a packing a,
but so easythat the inner pressure of the liquid is sufficient to close the valve b when the inlet-valve is opened. It is obvious that the valve can also be held in its closed position by means of a spring f or the like. The eccentric cam c is so placed on the valvespindle c that it does not actuate the valvebar a, which may be suitably provided with an end extension at or the like before the valve-spindle has been screwed down in its closed position. The spindle 0 moves up or down in its nut, according as the inlet-valve is to be opened or closed. As soon as the water is shut off the valve b will thus be opened, so that the air is allowed to enter and the water to escape from the water-meter.
It should be observed that the invention is not limited to the construction set forth in the drawings, but can be varied in several ways without departing from the chief idea. For instance, the screw-valve for shutting off the liquid could be substituted by an ordinary cock actuating the air-valve when in closed position. Instead of the described airvalve a turnable plug could be used.
Having now described my invention and how it may be carried out, what I claim, and desire to secure by Letters Patent, is-
. The combination with a water-meter, of a rod running through the wall of the meter, a small valve fastened to the end of said rod and adapted to normally close a small airpassage in said wall, a projecting cam on the ordinary inlet-valve of the meter adapted to actuate the said bar so as to open the said air-valve when the said inlet-valve is closed, substantially as set forth.
In witness whereof I have hereunto set my hand in presence of two witnesses.
DAVID VERNER HALLBERGH.
Witn esses G. LINDKVIST,
H. L. KJELLBERG.