US1058072A - Rock-drilling engine. - Google Patents

Description

J. G. LEYNER.

ROCK DRILLIN'G ENGINE? APPLIUA'rIon rILnD JULY 5,1910.

1,058,072. Patented Apr. 8, 1913.

2 BHEETHHEET 2.

ZZ/neJJeJ z UNITED STATES PATENT OFFICE.

JOHN -GEORGE LEYNER, OF DENVER, COLORADO, ASSIGNOR TO THE J. GEO. LEYNER ENGINEERING WORKS COMPANY, 0F LITTLETON, COLORADO, A CORPORATION OF COLORADO.

ROCKDRILLING ENGINE.

Application led July 5, 1910.

To all whom t may concernv Be it known that I, JOHN GEORGE LEYNER, a citizen of the United States of America, residing in the city and county of Denver and State of Colorado, have invented a new and useful Rock-Drilling Engine, of which the following is a specification.

My invention relates to improvements in rock drilling engines, and the object of my invention lis to provide a rock drilling engine in which the hammer piston cylinder and its cylinder heads are held in operative relation to each other by resiliently yielding connections. I attain this yobject by the mechanism illustrated in the accompanying drawings, in which:

Figure 1 is a plan view of my improved rock drilling engine. Fig. 2, is a longitudinal, central, sectional view of Fig. 1. Fig. 3 is a front view of the cap for the front cylinder head. Fig. 4 is a rear view thereof. Fig. 5 is a horizontal sectional view of the same on the line 5-5 of Fig. 3. Fig. 6 is an elevation of the rear cylinder head, the water inlet hub thereof being shown in section.

Similar letters of reference refer to similar parts throughout the several views.

Referring to the drawings, the numeral 1 designates the supporting base of my improved rock drilling engine, which I term a guide shell, it being so called because it forms a support and also a guide for feeding the drilling engine forward toward and backward from rock when in operative drilling relation thereto.

The rock drilling portion of my rock drilling engine comprises the cylindrical casing 4, in which a cylindrical bore is formed, which is adapted to receive the hammer piston. At the opposite end portions of the cylinder counterbores 23 and 24 are formed, which are adapted to receive front and rear cylinder heads 25 and 26. The hammer piston bore is preferably a straight bore of one diameter, and in it a hammer piston 27 is reciprocally mounted. This hammer piston is reciprocally mounted in the cylindrical bore of the casing, and it is provided at its front end with a hammer bar extension 28 of smaller diameter than its piston head portion, which extends reciprocally through a rirg 29, which I term ithe front cylinder ring. The front cylinder ring is placed at the junction of the cylin- Speciiication of Letters Patent.

Patented'A pr. 8,191 3.

Serial No. 570,339.

dcrs hammer piston bore and of the counter bore 24 of the cylinder casing.

The front cylinder head 26 comprises a tubular-shaped casing which is provided with collar portions 30 adjacent to its oppo- 60 site ends. The rear end of this front cylinder head .extends into the counter bore 24 of the hammer piston cylinder. This front cylinder' head is provided with a straight cylindrical bore in which a sleeve 31 is 35 rotatably mounted. This sleeve 31 I term the chuck sleeve. This chuck sleeve 31 is provided with an aXial bore of two different diameters, which are botharranged in axial alinement with the bore of the hammer .7,0

piston cylinder; The larger axial bore 327i/ extends from the rear end of the chucl/ .sleeve to Within a short distance of its front end, where itterminatsina smaller bore` 33,

and a shoulder 34 is forme'dat the junction ,g5

of these two bores. A bushing 35, which I term the chuck bushing, fits tightly in the bore 32 of the ychuck sleeve and is seated; against the shoulder 34. The entrance to the rear end of the chuck sleeve is threaded, so

39, which I term the chuck ring, is placed in (i5 the bore 32, between the chuck nut andth'e chuck bushmg 35. A cap 42 fits over th i front terminal end portion of the 'fro'n' hcylinder head against the front collar 30 formed on the cylinder head. At the rear end of the cylinder casing a ring 43, which I term the rear cylinder ring, is placed in the counter 'bore 23 of the casing of t e cylinder against the shoulder formed at the junction of the said counter bore and the hammer prevent the compressed air in the cylinder 10c from leaking past it and the hub of the rear cylinder head to the atmosphere. The rear cylinder head 25 is provided with a hub poition 46 that extends a short distance into the counter bore 23 of the'cylinder close/to the 1105r adjacent side of the ring 43. Thesecylinder rings 29 and 43 act as buffers to such reciprocal strokes of the hammer piston as anh not cushioned by the compressed aixl actu-.t-

ing fluid when the hammer piston is not 11C striking against a drill bit that is not in operative position against a rock. The cyllnder and the cylinder heads and the front cap are arranged to be clamped together under a resilient clamping pressure of sufiicient tension to hold them in operative alinement and position under such operative strains as the drilling engine is subjected t0 while drilling rock.

My invention contemplates in this respect any means by which these several parts can be resiliently clamped or secured together so that each will have a slight yielding movement independent of the others under severe strains and which will enable an operator to take the machine apart and put it together again in a few moments When necessary to repair or otherwise keep it in operative order; and, while a number of different methods of connecting this result might be employed, I preferably,

sides of the opposite ends of the cylinder of the drilling engine and the opposite sides of the front cap and of the rear cylinder head are provided with laterally projecting lug portions 46A, in which apertures 47 are formed, through which bolts 48 extend loosely. These bolt-rods extend through the apertures of the lugs from of the bolt-rods extend through and far enough beyond the back head to each rcceive a nut 51A. The apertures 47 through all of the projecting side lugs are round, but the side of each of the bolt-rods at their threaded end portions are flattened along their sides that lie adjacent to the sides of the cylinder. This flattened portion extends far enough from the ends of the bolt-rods to permit flat faced lugs 47A, which form a part of the projecting lugs 46A at the rear end of the cylinder and also form a part of and project from the side of the rear end of the cylinder, to bear against the Hattened sides of the bolt-rods and thus prevent the bolt-rods from turning in their apertures 47 of their supporting lugs. The nuts 5lA are eah provided with a projecting key portion 5l, which extends cross its squared up end. Ihese key portions 51B are adapted to tit into head, and they lock dentally unscrewing from the ends of the bolt-rods when the bolt-rods are tightly bolted in their operative positions.

these parts to effect yielding side rod bolts, as

larger -diameter than those through which the bolt-rods extend to receive and form housings for coiled expansive springs 50, which are mounted on the ends of the bolts, preferably adjacentto the heads 51 of the bolts, and consequently are compressed between the heads of the bolt rods and the wall 49A at the bottom of the apertures 49 that surround the bolt-rod receiving apertures 47. The nuts 51A are screwed onto the bolts and against the lugs of the rear cylinder head to exert suliicientiresilient expansive compressive pressure on the cylinder heads and cap against the ends of the cylinder to hold these parts in operative alinement. The cylinder heads 25 and 26, with their internal cooperating parts, and the cylinder rings 129 and 43 are fit-ted in such relative relation to each other and to the shoulders between the counter bores 23 and 24 and the cylinderbore that these cylinder rings 29 and 43 are held tightly against these shoulders by the resilient clamping tension of the springs on the bolts 48.

have found in practice that the tension best adapted to the operative, stationary and slipping condition of the ratchet ring should e sufficient to exert a pulling pressure on the rear cylinder head against the ratchet ring and of the ratchet ring against the rear cylinder ring such as would require the use by an operator of a wrench of about a foot in length applied to the drill-bit to turn the chuck and hammer piston and the rifle bar against the teeth of the ratchet ring in order to cause the ratchet ring to rotatively slip in its seat.

The rear cylinder head isI provided with an axial recess bore 52that extends into its hub portion a short distance, and in it a ratchet ring 53 is rotatably mounted. This ratchet ring is, however, enough thicker than the depth of the recess 52 to project a trifle ping or yielding pressure by the resiliently will be readily understood.

An axial aperture 63 is formed entirely through the rifle bar and an axial aperture 67 is also formed through the hammer piston. These apertures (33 and 67 large enough to receive tube 68, which extends the front cylinder head 26. The cylinder is provided with a valve chest 69, which preferably is position'edrcentrally on top of and lengthwise of it and -an air inlet valve 84 is arranged to control the admission of air to the valve chest.

In case the drill bit sticks in a seam in the rock vduring the operation of the machine,

its seat in the recess of the rear cylinder -head and the rear cylinder ring, due to the yielding connections provided by the present invention.

While I have illustrated and described the preferred construction and arrangement of -my improved rock drilling engine, I do not wish to be limited to the construction and arrangement shown, as many changes might be made therein without departing from the spirit of my invention.

`Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a rock drilling engine, the combi? nation of a cylinder provided with a front and a rear cylinder head, a drill bit driving hammer piston reciprocally mounted in said cylinder, a. drill bit holding chuck said front cylinder head', rings in the opposite end port-ions of said cylinder arranged to define the reciprocal movement of said hammer piston, lugs on the opposite side portion of said cylinder and its heads, said lugs being provided with bolt-rod receiving apertures, bolt-rods extending through the apertures of said lugs and provided with heads at one of their ends positioned adjacent to thefront side of the lugs of said front cylinder head, said bolts being arranged to extend loosely through said lugs from the front end ot the drilling engine and to lie alongside of said cylinder, nuts threaded to the ends of said bolt rods, eX- pansive springs mounted on said bolt rods between the head portions of said bolt rods and the front side of the lugs ot said front cylinder head, said nuts being adapted 1to clamp said cylinder heads and said cylinder bet-weon said springs and the heads of said bolts, a flattened portion on the sides of said bolt rods adjacent to said cylinder, and a lug on each side of said cylinder arranged to project against the flattened portion of said bolt rods and adaptd to prevent said bolt-rods from turning.

Q. In a roel; drilling engine, the combination of the cylinder' provided with cylinder rings and with heads fitting opposite ends, one ot which is provided with a cap which forms an extension thereof, the side bolt rods provided with springs and with nuls on their ends, said side rods being con` nected to said heads and arranged to clamp theln to said cylinder with an adjustable resiliently yielding {.irossure, and a housing on onc of said heads for said springs.

3. lu a roch drilling engine, thecol'nbination of a cylinder provided with cylinder headsy al its opposite ends, one ot' which is provided with an extending cap portion that forms a part thcrcot, ings on the opposite cylinder head and on the cap portion ot said other "r'liudcr head, provided with bolt receiving apertures, bolts provided with head portions extending through the lugs of one head and through the lugs of said cylinder into and through the lugs of the cap portion of the opposite cylinder head, expansive springs on said bolts at their head portions, which are adapted to be housed in sockets formed in said cap, and to abut against the bottoms of the sockets and the heads of the bolts, and nuts threaded to the opposite ends of said bolt rods and adapted to be screwedagainst the adjacent cylinder head and to compress said springs to draw 'on said bolts to clamp said cylinder heads to said cylinder with an adjustable resilient yielding pressure, lugs projecting from the opposite sides of said cylinder and a flattened portion on said bolt-rods arranged to' engage said lugs and prevent said rods from turning, a keyway slot extending across the rear .face of the lugsf said rear head in diametrical alinement with the bolt apertures through said lugs and a projecting lug shaped key portion formed on each nut of said side rods arranged to seat itself into the keyway recess of said lugs.

4. In a rock drilling engine, the combination of the cylinder and the cylinder heads, one of which is provided with a cap portion, apertured lug portions on the oppo site side portions of said cylinder and cylinder head and saidv cap, bolt rods extending through said apertured lugs each of which is provided with a head, threaded end portions and nuts on the opposite end portions of said bolt rods, expansive springs o n said rods between said heads and said cap arranged to exert a resilient yielding pressure on said cylinder and it-s heads, housings be ing formed in said cap to receive said springs, and means including rings in the opposite ends of said cylinder' for receiving the clamping thrust of said cylinder heads v againstsaid cylinder.

5. In a rock drilling engine, thc-combination of the cylinder provided with a piston bore and With a counterbore, provided with a shoulder between said cylinder-s pist-on bore and said counterbore, and the cylinder head projecting into said counterlmrc, a ring seated in the shouldered counterlmre of said cylinder between said rear cylinder head and said shoulder, a circumferential groove in the peripheral surface of said cylinder ring, and a packing in said groove adapted and arranged to prevent the leaking of compressed air from said cylinders bore past said cylinder ring aud said rear cylinder head to the atmosphere.

(3. In a compressed air or other actuating fluid operated rock drilling engine, the com4 bination ot' the supporting shell provided with guideways and a depending huh pow tion, a cylinder provided .vith cylinder' heads litting loosely into the Opposite end portions of said cylinder, and bolt rods extending along the opposite sides of said cylinder and vits cylinder heads provided with springs and with nuts threaded to said rods arranged and adapted to clampingly bolt said cylinder and its cylinder heads and said drill bit operating mechanism in operative relation together by a resiliently yielding clamping pressure that wlll under normal Ioperation resist rotative strains and that will prevent the breakage of said drill bit operatng mechanism under abnormal operative strains by slipping rotatively. x

In testimony whereof I affix my signature in presence of two witnesses.

JOHN GERGE LEYNER. Witnesses:

G. SARGENT ELLIOTT,

ROBERT J. WALTMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner o1 Patents,

Washington, D. C.

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