US169587A - Improvement in rock-drilling engines - Google Patents

Description

G. H. REYNOLDS. ROCK-DRILLING ENGINE.

Patented Nov.2, 1875.

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UN E STATE PA EN OFFICE.

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- IMPRQVE E T in""RoCKDRuuNeQE em Es.

V Specification iorming part of Letters Patent N o. 169,58 '7ydatod November 2, 1875;

j a September 2 1875.

To'a-ll whom it may concern Be it known that I, GEORGE H, REYNOLDS, of New York city, in the State of New York, have invented certain new and'u set'ul Improvements in Rock-Drill Engines, of which-the following is a specification r I have devoted much timefand labor to the production of an engine which shall work successt'ully without valves, reciprocating'with a high degree velocity and to about theright extent under. all conditions. My present invention is designed more perfectly to accomplish the same object; i

With this mode of operation, without valves, it is important that the time of the covering and uncovering of the ports by the movement of the piston should be very nicely adjusted; and it is-important that when a port begins to be uncovered it shall immediately expose a large area to the passage of the steam through the port. .i

I have arranged my ports to terminate in a ring or annular channel, extending all around the interior of the cylinder. piston has moved so far as to commence to uncover a port it opens the entire area quite around the piston to the movement of the steam. When the piston is closing a port there remains a liberal opening. for the movement of the steam until the edge of the piston has arrived at the closing position, and then it at once closes the space quite around the piston.

I have provided for the movement of the steam across the extended area thus provided by gathering it in a comparatively narrow channel in one portion, casting the cylinder with a corresponding high ridge on its exterior along the proper'line, and coring a crooked passage, by which the ring of steam-space before referred to is jumped or traveled over without forming a communication therewith.

The accompanying drawings form a part of this specification, and represent what I consider the best means of carrying out the invention in its application to an ordinary rockdrill.

Figure l is a section, which, in order to cut through both the receiving and discharging ports, is madeon the line 00 y z in Fig. 2-that is to say, the upper half of Fig. 1 is a section The moment the 3 application filed '1 I on the linear y, and the lower half of Fig. is

a section on the line 3 z. Fig. 2. is section on the line 8 s in Fig. 1.

Similar letters of reference indicate like parts in both the figures.

A is the body of the cylinder, pr vidcd with heads, stuffing-boxes, and means for turning the drill as the piston reciprocates'. B is a doublepiston, forged or otherwiseiformed on a single stout stem, which connectsthe pistons and the drill. .The pistons'are placed at the proper distance apart, and 'thezports are so arranged that when the piston has been thrown to one. end of the cylinder-the steam is received at that end through a liberal passage, and it is exhausted from the opposite end. As soon as the piston has been thrown its movement changes the steam-connections,

a crossand it is impelled violently back again. With steam of a reasonably high pressure the rockdrill,-properly attached, will reciprocate from ten to twelve complete doublestrokes per second.

The ports and the broad passages or chambers connected therewith outside of the cylinder, being ot' master importance in this construction, will be designated by several separate letters. The port through which steam is admitted is marked M. The broad chamber into whichit is received is marked M. This chamber M extends quite around the cylinder. The port through which. steam is exhausted or discharged into the atmosphere is marked P. A long narrow passage, extending parallel to the cylinder, and at a distance therefrom greater than the thickness of the chamber M on that side, is marked P Each end of the passage P bends inward toward the cylinder, and communicates with the interior of the cylinder through the medium of a port or hollow channel, P extending quite around the cylinder. Two channels, through which, when the piston is at or near either end of its stroke, the steam is allowed to flow from the central space between the two pistons to the nearest end of the cylinder, are marked B. Each end of these channels is bent inward, and communicates with the interior of the cylinder through the medium of the ports or hollow channels R extending quite around the cylinder. .Thejsteam,-i-n traversing through tlre'lpas'sagefR, is compelled-atone "p'ointgzto pass ov'er the' port-P At this poin't'the' metal of the cylinder is thickened, and the passage is bent outward, so as to leave a sufficient thickness of metal between it and the port P as: indicated; by=-"R When, in the'w'orkingt'ofi 'my"engine?atithe high velocity required for economy in this line of engineering, the piston moves toward either end of its stroke and commences to"uncover one of the ports R it allows a free flow of the steam through the uncovered area, not of an ordin aryi port, but: of anzannular p2 ssageaquite around the piston. Steam therefrom flows through the passage R thence through the passage R, and enters freely into the cylinder ain'- advance-' of the. front end :of the -piston.=

lhe pressure generated there stops the :mo-

inentum of theipiston before it-has reached the:

However-weak theJ-steam i may be, and however violent'the motion, the

end .of its stroke.

rchance rof. arresting the motion of the piston "by destroying-ritsz momentum is-.in'creased by :the :suddenw closing'lof i the:entire port? and the v uim prisoningrofi the. steam in advance of '2 the #:piston, jso thatzit cannotflowbackward. The r iarea -iistthengreatest possible until the piston r has icutnitfloff, .a-nd then r. as suddenly as .possi- .bles thersteam is'iim'pri'soned, rand comp'elled zto 1 :serveiasia wcus'hionwin advance of theip'iston, first diminishingixtherstroke, and :then vh aste-n- :iin'gethe return-stroke'bf the. piston. rreturm'stroke,-.the1 'moment the piston-has Ibezgunikto":uncover thevzport' it uncovers a i-large.

ssarea, andf theststeam entersfreely.

'Dhe sameBoHstruetion oirall the :ports makes 1 eiwch'anges o'fi"condition1 at each wreciprov cationimor'ewigorous. When the :pis-tonl'opens r or closes the port P it does itrvery. rapidly, with the. largest I possible mriea; and the same is 't'rue'o'f each port; In consequence of "this peculiarity each port may be narrower than 'wouldotherwise be allowable.

,The bending of the port or passage R R to "crossthe other "port',' P not -onl'y avoids any interferen'ceofa'currents and communication of steam from one passage to the other, but also maintains a uniformity in the thickness of the cylinder, avoids'contortions in cooling, and reduces the liability to fracture.

It is more important in my cylinder than in -;thoseusually employed :thatithe -boreshall be cno. H- REYNOLDS.

Witnesses:

PHILLIPS ABBOTT, GHASwOMST-ETSON.

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