US68473A - wejtz - Google Patents

Description

Ipatient @fitta Letters Patent No. 68,473, dated September 3,. 1867.

IMPROVEMENT IN LOW-WATER DETEGTOBS FOB. STEAM-GENERATORS.

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TO ALL WHOM I'l MAY CONCERN Be it known that I, J. V. WEITZ, of Cleveland, in the count-y of Cuyahoga, and State of Ohio, have invented certain new and useful Improvements in Steam-Valves; and I do hereby declare that the following is a full 'and complete description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is a side view ofthe apparatus.

Figure 2 is a front end view, with the right-hand port of the valve opened.

Figure 3, a front view, with the left port opened.

Figure 5, a transverse section. i M

Figure 6, a detached section.

Like'letters of reference refer to like parts in the diiferent views.

A, fig. 1, is the valve-chamber, in which are arranged the valves B C, tig. 4, of which B is connected to the'shaft D, and C to the annular chamber E. The front end of this chamber is supported by 'and turns on the shaft D by means of a sleeve, F, attached to the head G ofthe chamber, and through which the shaft is seen to project, whereas the opposite end of the chamber passes through and is supported by a diaphragm, G', and in which it oscillates, as' will hereafter be shown. To the projecting end of thesleeve F, referred to, is keyed a dependent arm, H, figs. 2 and 8, provided with lateral lugs I, in each of which is a rounded notch, J. To this arm are transversely xed the stays K K', in which are supported and guided the weighted rods L L', which are hung in the notches of the-lugs I by means of the crossarms I', fig. 2, the purpose of which will hereafter be shown. 'To the sleeve is also keyed a vertical arm, M, iig. 1 to the upper end of which is pivoted a crank, M', and

a cam, N, a side view of which is shown by the dotted lines in fig. 3. To the end of the shaft D, which is seen to project through the sleeve, and in which it works, is keyed a vertical lever, N', provided with horizontal arms D' D', in the ends oi` which a rounded notch is cnt", in character and position the same as those in the lugs above referred to, and in which one of thc cross-arms I is lodged, as shown in gs. 2 and 8. The upper end of the lever N'is rounded to a rod-like stem, and is `connected to thccranlc "N' by an cye,-P, through which the stem slides, and is guided in its movements. Journallcd in the cheeks of thc stay P', iig. 3, is an eccentric, Q, iig. 5,

in which 'ligure a is the shaft.. On this eccentric is placed and opera-ted a cam, Q', of which g. 6 isa detached section. By this arrangement-it will be obvious that, as the eccentric is made to turn by the governor to which it is connected and operated, the dependent lug b of the cam will be more or less depressed, according to the radial throw of the eccentric.

'Having thus indicated the several parts of the apparatus, the operation of thc same is as fcllowsf When the-,lever N' and arm M are brought to a vertical position, as indicated hy thc red line, iig. 3, the valve B, to which the lever N' is attached by means of thc shaft D, closes the port c, as shown in fig. 5, thereby shutting oli` the steam from the. ports d d', one on each side of the valve C, as indicated by thc dotted lines. Now, in order to induct steam into the cylinder through either of the ports (Z, it will he necessary to move the valve B from the port c, and at the same time to move the valve C so as to bring the port c in conjunction with the port 0l or cl'.. To accomplish this shifting of the valves, the arm Il is connected to the eccentric of thev engine, and by which it is made to oscillate, and thereby operate the valves. Thus when thc'arm H is drawn to the right, as shown in iig. 2, the valve C, iig. 5, will bc moved to the right, and thus bring'thc port ein conjunction with port d, at the same time the arm is being drawn to the right and moving this valve. The cam N strikes against the lug 6 ofthe cam Q', thereby throwing the crank M' and the lever Il, to which it is attached, in-'the direction shown in tig. 2. This lever being keyed to the shaft D, operates the valve B, and causes it to slide in the direction of the arrow, and thus opens'the port c, through which the steam enters the port d, and from thence into the cylinder. At thc moment the car of the cam N slips from the lug l the weight on the rod L', which is now raised up and supported, on the thuslifted arm of the lever, will cause the lever N' to approach a vertical line, and will thus throw the opposite car of the cam against the lug b, as shown in fig. 3, and which,

b. the reverse action of the eccentric new exerted u on the arm H, carries the lever crank and cam to the position shown in fig. 3, which, it will be seen, is the reverse of that shown in iig. 2. This, as a consequence, produces a reverse movement of the valves, thus throwing the valve B toward 9:, and the valve C toward port d', until the ports c and ci are in conjunction, and so on alternately. As the arm H is oscillated from right to leit, and from left to right', each time the arm H operating directly the valveC-and the 'cam N, crank M operating the valve B by means ofthe arm H, and the weights*alternately bringing the ears of the cam against the lug o.

It will be obvious that the distance the ports are opened andthe amount oi' steam admitted to the cylinder at once will depend upon the length of the throw of the valves; hence the greater the threw' of the valves the wider` the ports will be opened, and a larger amount of steam admitted into the cylinder, thereby increasing the action of lthe engine. In order to regulate the amount of steam in the cylinder, and give a constant` and uniform supply, and thus obtain a regularity in the ruiming oi' the engine, the governor is attached te the eccentric Q, to which the cam Q is connected and operated as above described. New, if the longer radius of lthe eccentric is downward, the lugo willL descend and cause the can] N to be thrown more obliquely as it passes under the lug, the consequence of which will be to increase the length of the vibration of the lever N', which will produce a corresponding increase in the throw of 'the valve B, thereby opening the port c, more or less, as the vibration given to the valve by the distance the lug may have been made to descend, and which, it will be evident, is'gauged or controlled by Lhc'action or" the governor. Thus the induction ot'- the steam is easily and simply graduated to the demands of the engine. Shouldthe eccentric be so turned as to bring its shortest'radial line downward, the cani or lug oi the earn would be thrown up so far that the ears of the cani N would not strike. In this condition the valve B would cease to operate, closing the port, and thus bring the engine to a stop. The valve B, and the above-described arrangement for operating the saine, may be easily and cheaply applied to an old engine, not expressly constructed for its application, by taking the annular chamber E and valve B andplacing it above the steam-chamber A or at any desirable point. In applying the valve to an old engine in this way the annular chamber answers as the. steam-chest for the valve. In applying the cntoil` valve in this way it will be necessary to operate it by attaching the eccentric rod te the arm M instead of to the arm H, as in this ease, and still retaining the apparatus in all its essentials the saine.

The manner oi' operating the cani Q. by the governor is by attaching the rod oi' thc said governor to the upper end of the rack indicated by the dotted line R, fig. l, which ig; seen to engage in. the cog-wheel R connccted to the cani. As'tlie rack is made'to move upward and downward the cam will be turned more or'less, and cause the lug Z) to descend or rise up, and' thus eiect the action of the cam N, for the 'purpose above said. Should the action of the governor be 'so great as to raise the rack so high as to cause the-spring S to lodge u'pon the top ofthe reach S', as shown in iig. 1, the lng b will be so far raised as to be no longer engaged by the cam N; the consefplenee will be a full stopping oi' the engine, and thus avoid all danger that might result from an undue speed.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. The arm Il, stays K, weighted rods L L', arranged in combination with the sleeve l" and valve C, for the purpose and in the manner set forth.

2. The vertical arm M, crankill, and cani N, in combination with the valve C, as and for the purpose described.

3. The lever ll', when operated eonjointly by the crank M and weightedrods L, in combination with the valve B, as and forl the purpose set forth.

4. The eccentric Q, cam Q', and lug b, as arranged in combination with the cam N, forthe purpose and in the .manner substantially as described.

J. V. WElTZ.

Witnesses:

J. H. Bunninen, E. E. Wenn.

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