US101832A - Improvement in pressure-gauges - Google Patents

Description

H. CHWATAL Pressure Gage.

Patented April12, 1870- N. PETERS, PNOTO-LITNOQRAPIIER, WASHINGYON D C dint-toil tatrs v aunt diflfiire.

HERMAN OHWATAL, OF NEW YORK, N. Y., ASSIGNQR TO W. STAEHLEN, AND L. PORTONG.

Letters Patent No. 101,832, dated April 12, 187 (mtedatezl April 2, 1870.

IMPROVEMENT IN PRESSURE-GAUGES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, HERMAN CHWATAL, of the city, county, and State of New York, have made certain new and useful Improvements in Dial-pressure and Vacuum-spring Gauges; and I do hereby decla re that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings and letters of reference marked thereon, they making part of this specification.

The nature of this invention consists in the peculiar arrangement and construction of the crank or eccentric upon the hand-arbor, used for transmitting the motion to the hand, it being constructed in a manner to adjust the crank-pin with great precision, and to adjust it while and with the working-parts together, ready for operation. By these means the gauge can be set very accurately, and is prevented from soon becoming defective in accuracy.

To enable others skilled in the art to make and use my improvements, I will proceed to describe their construction and operation in detail.

In the annexed drawings- Figure 1 is a vertical central section of the gauge with my improvements.

Figure 2 is a face-view of the same, the dial shown removed and represented in red outline-s.

Figure 3 is a detached vertical section of my improved adjustable lever or crank on an enlarged scale.

Figure 4 is a side view of the same.

Figure 5 is a face-view of a modification of the said lever or crank.

Similar letters of reference indicate corresponding parts in the several figures.

A represents the usual circular case;

B, the dial;

0, the hand;

D; the usual corrugated circular spring of the gauge; and

E, the flange-ring, by means of which the spring is secured.

F is the ordinary right-angular armed lever, which has its fulcrum in the upper end of the plate G, and bears with the one arm upon the central portion of the spring, while the other arm serves to transfer its motion received from the spring to the hand of the instrument. v

H represents the arbor upon which the hand is secured, and it'is provided with a slotted crank or lever, I, which has an adjustable crank-pin, J, working in the slot K of the said crank, and arranged with its arbor, so that the said pin can be adjusted and set to any minute distance from the center of said arbor with great precision. For this latter purpose I securethe said crank-pin in a block, L, fitted with great precision to slide in the slot K of the crank, and provide the said crank with a feed-screw, M, arranged parallel with its slot, fitted with its screw-thread in the rear portion of the said block I, and having its bearings accurately fitted, side and endwise, guided in the rear projections N N of the said crank.

In order to turn the said feed-screw, I make square its projecting end, and have, in order to guide it endways, proper shoulders formed on it to fit against its bearings.

It will be seen, by means of the feed-screw M, the said block L and the crank-pin fitted therein are made adjustable with the desired precision to the motion of the spring, corresponding with the desired indicating scale of pressure.

The plate G is secured to the flange-ring E of the mainsp'i-ing of the gauge, by means of the screw 0, and the aperture through which said screw 0 passes is slotted, in order to adjust the said platewith more facility, and to save labor in manufacturing them in quantity.

1? represents a coiled hair-spring, usually employed in these gauges for taking up the lost motion of the working-parts, and to give the hand a steady and positive movement. It is secured with one end in the post Q upon'thc flange-ring E, while its other end is attached with the crank of the m nd-arbor.-

By means of the rod R, the crank-pin J and, lever F are connected, and thereby the motion of the mainspring of the gauge transferred to the hand-arbor and hand.

From the foregoing it will be seen that, by employment of the above-mentioned working-mechanism, the construction of the gauge is greatly simplified and its production economized, its durability and service made more certain and accurate, which. advantages are of great importance to the public.

Having fully described my invention,

What claim therein, and desire to secure by Letters Patent, is-

In steam and other pressure and vacuum-gauges, the employment of the crank I, when provided for adjusting the pin J of said crank with the-screw M and sliding block 1., substantially as and for the purpose herein shown.

H. CHWATAL. .Witnesses A. Bnnssrn, J. ROSENGAK s.

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