USRE4775E - Improvement in registering steam-gauges - Google Patents

Description

E. CLARK.

Improvement in Registering Steam Gauges.

No. 4,1775.I Reissued March5,1a72.

/\ g l v UNITED STATES PATENT OFFICE.

ELIJAH CLARK, CF LOUISVILLE, KENTUCKY, yASSIGrXOPt T() THE UNITED STATES STEAM-GAUGE COMPANY.

IMPROVEMENT IN REGISTEING STEAM-GAUGES.

Specification forming part of Letters Patent No. 101,583, dated April 5, 1870; reissue No. 4,775, dated March 5, 1872.

To all whom it may concern:

Be it known that ELIJAH CLARK, of Louisville, county of J etferson, State of Kentucky, assigner to The United States Steam-Gauge Company;7 of Louisville, has invented a new and Impro-ved Registering Steam-Gauge, of which the following is an accurate description, reference being had to the accompanying drawing making a part of this specilication, in whichl Figure l is a plan view of my device; Fig. a vertical central section of the same. Letters of like name and kind refer to like parts in each of the figures. D

The object of the invention of said CLARK is the construction of a gauge which shall register automatically every excess of the prescribed pressure of steam in boilers and also the maximum pressure: and it consists in certain combinations of its operative parts for the purpose of ei'ecting the above object, all as more fully hereinafter described and set forth. In the drawing, A represents a hollow knob, into the diaphragm of which steam passes from the boiler and operates a pressure-rod, which communicates movement to a suitable spring, B, placed conveniently within the ease C, which is covered by the dial-plate D. This knob has also a drip or passages, a, to conduct away any moisture which may collect in the operation of the device. A plate, E, has pivoted upon it a lever, F, which has a set-screw, b, projecting from a point near one end, which set-screw is in the path of the pin c, which extends from the arm G, also suitably pivoted. At the other end of the lever F is pivoted a pawl, H, having a pointed end, which is kept by a proper spring in contact with the registering ratchet-wheel I, the teeth of which are numbered consecu- 'tively from 1 upward, a space, d, however, be-

ing left between the iirst and last teeth. A detent, J, is connected with the lever F, and en gages as a pawl with the teeth of the registering-wheel. A link, K, having near one end a slot, e, through which passes a pin, f, which projects from the lever F, is jointed at its other end to one side of a disk, L, which disk has for its axis the shaft M, which shaftMcarries the index-nn ger P, extending over a scale,

O, upon the face of the dial-plate. From another side of the disk L projects the index-iinger P,-exte ndiug over a scale, Q, also upon the face of the dial-plate. A suitable spring, R, which is connected with the shaft M, completes the enumeration oi' the separate parts of the device.

In operation, the set-screw b is s'o adjusted that it will not be operated upon by the pin c, except by an excess of the prescribed pressure of steam, and the registerin g-wheel is revolved, so that the end'of the pawl H shall rest against the side of its rst tooth. The index-fin ger P is pressure, and the case is locked up and sealed by the proper oiicial. When thesteam exceeds the prescribed limit of pressure the spring B will move the arm G and carry the pin o against the set-screw b in the lever F, which, in turn, being moved, will carry the pawl H, the pressure of the end of which against a tooth of the registering-wheel I will cause it to revolve the distance of one tooth and no more, while the pressure of the detent J will prevent said wheel from moving back. Thus, in every instance of ing-wheel is revolved the distance of one tooth, and the number of teeth above `the end of the pawl Hwill always exhibit the numberof such excesses during a trip or voyage or specified time. That it may be out ofthe power ofthe en gineer, by keeping up a great pressure, to turn 'the wheel an entire revolution so as to bring it back to the point where it was adjusted by the proper official, the spaced is provided, so that when said spacemeets the end of the pawl H it will have nothing to strike against, and the registering-wheel will be revolved no more by any pressure of steam. As the registeringwheel thus records the number of excesses ot' pressure the index-iinger P records the maximum pressure at any time, the pin f in any movement of the lever F, caused by excess of pressure, moving the link K, which in turn reger P around its scale. As the pin f moves freely in. the slot above mentioned, the indexfinger cannot return, and can only be moved forward by a still greater excess of pressure.

then placed in proper adjustment at the zero excess of the prescribed pressure, the register- 4 volves the disk L, which carries the index-n- Having thus described this gauge, what We claim as new therein, and the invention of ELIJAH CLARK, is-

1. In a registering steam-gauge, the combination of the following instrumentalities, viz First, a registering-wheel; second, suitable mechanism for revolving the same in one direction and for preventing its return; and, third, suitable means for adjustment, so that the gauge will be operative as a register only at a prescribed limit of steam pressure, all gonstructed andoperating substantially as set orth.

2. In a registering steam-gauge, the combination of the lever F, slotted link K, and the index-finger P upon the shaft M, operated by' the excess of the prescribed pressure of steam for the purpose of recording the maximum pressure, substantially as set forth.

v3. In a registering steam-gauge, the colnbination of the registering-wheel I, the index- `fmger P, the lever F, the link K, the pawl H,

and detent J, for the purpose of denoting, by the same impulse, at the same time, the number of excesses ands the maximum excess of steam pressure, all constructed and operating substantially as set forth.A

4. In a registering steam-gauge, the combination of the registering-wheel I provided with the recess d, and the levers F and H, constructed and arranged substantiallyas describedl and shown, for the purpose of preventing continuous revolution of said Wheel, as set forth.

5. In a registering steam-gauge, the combination of the set-screw b with the lever F, for

the purpose of adjustment of the gauge to the zeroof the prescribed limit of steam pressure, substantially as set forth.

UNITED STATES STEAMGAUGE co. By s. W. oLoYD. President and Executive jcer. Witnesses:l

WILLIAM GRoMEY,

C. P. BARNES.

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