US1484678A - Fluid-actuated inlet valve for rock drills - Google Patents

Description

Feb. 26, 1924 11,484,678

' F. M. SLATER FLUID ACTUATED INLET VALVE FOR ROCK DRILLS Filed Dec. 6, 1921 2 Sheets-Sheet l INVENTOR HIS ATTORQEY Feb. 26, 1924, 31,484,678

- F. M. SLATER FLUID ACTUATED INLET VALVE FOR ROCK DRILLS Filed Dec. 6, 1921 2 Sheets-Sheet 2 INVENTON m cewfMzjlafcfiw HIS ATT NEY Patented Felt, 26, W24

IF SLATE-' @F TON, PENNSYLVANIA, ASSIGNOR T0 INGOLL-FJAND COM- FATENT FFHEO 19, @F dEY (CITY, NEW JERSEY, A. CORPORATION @F NEW JERSEY- FI L'UlllD-AGTUATED INLET VALVE FOR RUSK DRTLLS.

application filed December 6, 1921.

To all whom it may concern:

Be it kno that l Fran M, Sterne, a citizen of the United tates, and a resident of Easton, county of Northampton, and

0 State of Pennsylvania, have invented a certain Fluid-Actuated llnlet Valve for lR-ock Drills, of which the following is a speclfication, accompanied by drawings.

This invention relates to fluid actuated i rock drills, hut more particularly to a fluid actuated valve controlling only the inlet supply, the exhaust losing controlled by the piston llnlet valves of the usual t pe have heen 1 subject to the following efects: Either the iston has been long and consisted of two eads and a joining neck, or else it has heen necessary to throw the valve by compression.

The objects of the invention are to enable the valve to he thrown by live air and utilize a piston having one head, thus decreasin the over-all ength or" the piston and weight of the machine.

Further objects of the invention will hereinafter appear, and to all of these ends the invention is shown in the accompanying drawings, in which- Figure l is a diagrammatic view in longitudinal sectional elevation, of so much of a rock drill as will serve to illustrate the invention, with the piston at the beginning of its forward stroke,

Figure 2 is a similar view with the piston at the heginnin of its rearward stroke,

Figures 3 an d are similar views of a modification of the valve.

Referring to the drawings, and at first more particularly to Figures 1 and 2, the cylinder A of the rock drill is provided with the piston B, having the head C and forward extension or shank D. The fluid actuated valve E, in accordance with this invention, controls the inlet supply F and free exhaust ports G, of which there may be one or more, in this instance two being indicated, are controlled by the piston head C.

The inlet valve E is rovided with the end heads ll and a single central flange J of larger diameter than the heads H. The central flange J controls the passage of metill Serial lilo. 520,3 l4.

tive fluid from the inlet F to both ends of thed c linder A, through the passages K an Small ports, in this instance indicated as the ports 0 and P connect the inlet F directly with the spaces Q and lit respectively, at the ends of the valve, and connecting .passages S and T join the spaces Q and lit at each end of the valve with the cylinder at points between the middle and the ends of the cylinder,

The valve may he mounted in a valve chest, if desired, in any suitable manner, and in this instance, the ends of the valve chest are shown closed by the valve chest hushlngs U and V, as a convenient construction. The small ports (I) and l? are shown in all the figures, as extending through the valve itself as a preferable construction, and in Figures 1 and 2 they may conveniently'be formed in the central valve flange J. These small ports O and P are cut oil by the operation of the valve, and alternately connect the inlet F directly with the spaces Q and R at the ends of the valve as a preferable construction.

The valve is thrown by live motive fluid passing to the ends of the valve, through the small ports 0 and P and building up pressure at one of said ends of the valve, when the piston closes one of the connecting passages K or L, the other of said connecting passages being opened to atmosphere through the cylinder. The valve is held by the pressure of live motive fluid on one face of the central flange J, which as stated,

is of larger diameter than either head of the valve In the operation of the device, let it be assumed, that the piston B in Figure 1, is startin on its forward stroke. The valve is in t e position indicated in said figure, and live motive fluid passes from the inlet supply F around the valve, through the supply passage K hehind the piston head G, driving the piston forward. The pressure of motive fluid on the face of the central flange J holds the valve in the position indicated. Any leakage from the inlet, past the rearward head H of the valve, only serves to hold the valve in the desired position. Motive fluid passing through the Gil Gil-

lllltl haust G.

As the piston moves forward, and uncovers the exhaust G, the pressure holding the valve in its forward position is reduced to atmosphere both behind the central valve in Figure 3, the live motive fluid may pass flange and behind the rearward valve head H. The exhaust from the forward end or the cylinder having been closed by the piston in its forward movement, and the piston having over-run the connecting passa e S, the pressure of the live motive fluid bui din}? up in front of the forward valve head throws the valve rearwardly, opening'the sup ly of motive fluid to the forward end of t e cylinder, which starts the piston rearwardly and at the same time, the pressure on the forward face of the central flange J holds the valve in rearward position.

When the valve is in the osition indicated in Figure 1, it will be 0 served that the small port P is cut oil from the inlet supply and slmilarly in the position indicated in Figure 2, the small port 0 is cut ofi' from the inlet supply, This is. the preferable construction, because if these small orts O' and P were continuously open to t e inlet supply, there would be a certain amount of waste motive fluid passed through the said orts to atmosphere, through the open exiiaust port, and the motive fluid would not be alternately admitted to either end of the valve, although the valve would operate in substantially the same manner.

In the modification shown in Figures 3 and 4 the valve is provided with the small ports 0' and P convenientl located at an angle in the body of the va vs at the base of the central flange J instead of extending from the circumference of the flange-to the body of the valve, as in Figures 1 and 2. Otherwise the construction of the modification is like that indicated in the other figures and the operation of the device is similar. When the valve is in the position indicated freely through the small port 0' to at mos here through the open exhaust, but the sma 1 port P is cut off and motive fluid does not pass through said port owing to'the fact that" the connecting assage T is closed by the pistonhead C. imilarly in Figure 4, the small port P is openfor. the passa of motive-fluid and the other small port is out of, so that as in Figures 1 and 2, motive fluid is alternately admitted throu h said small ports to opposite ends of t e valve, for throwing sa d valve in opposite directions.

I claim: I v a 1. In atfluid actuatedrock drill, the combination with the cylinderand reciprocating piston, of a fluid actuated valve controlling the inlet. supply' and having end headsv and the passage 0 fluid passin a sin le central flange of larger diameter than t e heads? the central flange controlling to both ends of the cylinder small ports connecting the inlet directly with the spaces at the ends of the valve, connecting assa es joinin the spaces'at each end of t e va ve with t e cylinder at points between the middle and the ends of the cylinder, and a free exhaust port-controlled b ,the piston, whereby the valve is thrown y the live motive through sai small ports and building up pressure at one of said ends of the valve when the piston closes one of said connection passages, the other of said connectin passages being open to atmosphere throng thecylinder, and the valve: being held by the pressure of live motive fluid onone face of the central flange of larger diameter than the heads of the valve.

' 2. In a fluid actuated rock drill, the commotive fluid from the inletto the ends of the valvea single central flange of larger diameter 4 than the. heads, the central flange controlling the passageofmotive fluid from the inlet to both ends of the cylinder, small ports to alternately connect the inlet direc y with the spaces at the ends of the valve, connect ing passages joining the spaces at each end of t e valve with the cylinder at points between the middle and the ends of the cylinder, and a free exhaust port controlled by the piston, whereby the valve is thrown by the live motive fluid passing to the ends of the valve through said small orts and building up pressure at one of said ends of the valve, when the piston'closesone of said connecting passages, the other of said connecting passages being open to atmosphere through the cylinder, and the valve eing held by the pressure of live motive fluid on one face of the central flange of larger diameter'than the heads of the valve.

3. In a fluid actuated rock drill, the combination with the cylin er and reciprocating .piston of a fluid actuated valve controllin the passageof motive fluid from the inlet to both ends of the cylinder, small ports extending through the valve and connecting the inlet directly with the spaces at the ends of the valve, connecting passages joinin the spaces at each endof the valve with t e cylinder at points. between the middle and the ends of the .c linder, and a free exhaust port controlled y the liiston, whereby the valve is thrown ,by the 've motive, fluid passing to the ends of the valve through said small ports and buildi up pressure atone of said ends of the va ve when the piston closes lid nceaeve one of said connectiw pamages, the other oi said connecting passa bem held open to atmosphere through t e cylin er, and the valve beln held b the ressure of live motive flui on one ace of t e central flange or larger diameter than the heads of the valve.

4. In a fluid actuated rock drill, the combination with the cylinder and reciprocating piston of a fluid actuated valve controllin the inlet supply and having end heads an a sin is central flange of larger diameter than t e heads, the central flange controlling the passage of motive fluid from the inlet to both ends of the cylinder, small ports extending through the valve to alternately connect the inlet directly with the spaces atthe ends of the valve, connecting joini the spaces at each end of t e valve with t e cylinder at points between the middle and the ends of the cylinder, and a tree exhaust port controlled by the piston, whereby the valve is thrown by the live motive fluid passing to the ends of the valve through said small ports and building up pressure at one of said ends of the valve when the piston closes one of said connecting passages, the other of said connecting passages being own to atmosphere through the cylinder, and the valve being held by the pressure of live motive fluid on one face of the central flange of larger diameter than the heads of the valve,

5. lln a fluid actuated rock drill, the combination with the cylinder and reciprocating piston of a fluid actuated valve controllin the inlet supply and having end heads an a si le central flange of larger diameter than t e heads, the central flange controlling the passage of motive fluid from the inlet to both ends of the cylinder, small ports extending through the central flange and connecting the inlet directly with the spaces at the ends of thevalve, connecting passages joinin the spaces at each end of the valve with t e cylinder at points between the middle and the ends of the cylinder, and a free exhaust port controlled by the piston, whereby the valve is thrown by the live motive fluid passing to the ends of the valve through said small ports and building up pressure at one of said ends of the valve when the piston closes one of said connecting passe es, the other of said connecting passages being own to atmosphere through the cylinder. and the valve being held by the pressure of live motive fluid on one face of the central passages flange of larger diameter than the heads of the valve,

t. In a fluid actuated rock drill, the combination with the cylinder and reciprocating piston of a fluid actuated valve controlling the inlet supply and having end heads an a sin le central flange of larger diameter than die heads, the central flange controlling the passage of motive fluid from the inlet to both ends of the cylinder, small ports, extendin through the central flange, to alternate y connect the inlet directly with the spaces at the ends of the valve, connecting passages joining the spaces at each end of the valve with the c linder at points between the middle and the ends of the cylinder, and a free exhaust port controlled by the piston, whereby the valve is thrown by the live motive fluid passing to the ends of the valve through the said small ports and building up pressure at one of said ends of the valve when the piston closes one of said connecting passages, the other of said connecting passages being open to atmos here through the cylinder, and the valve sing held by the pressure of live motive flui on one face of the central flange of larger diameter than the heads of the valve.

7 lln a fluid actuated rock drill, the'combination with the cylinder and reciprocating piston of a fluid actuated valve controlling the inlet supply and having end heads and a sin lc central flange of larger diameter than t e heads, the central flange controlling the passage of motive fluid from the inlet to both ends of the cylinder, small ports connecting the inlet directly with the spaces at the ends of the valve, connecting passages joining the spaces at each end of the valve with the cylinder at points between the middle and comes onding ends of the cylinder, and a free ex aust port controlled by the iston, whereby the valve is thrown by the ive motive fluid passing to the ends of the valve through said small ports and building up pressure at one of said ends of the valve when the piston closes one of said connecting passages, the other of said connecting passages being open to atmos here throu h the cylinder, and the valve being held by t e pressure of live motive fluid on one face of the central flange of larger diameter than the heads of the valve.

In testimony whereof l have signed this specification.

FRED M. SLATER.

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