US114193A - Improvement in drill-cylinders - Google Patents

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ittica* @da CHARLES S. PATTISON, OF NORTH ADAMS, ASSIGNOR TO BURLEIGH ROCK- DRILL COMPANY, OF FITCHBURG, MASSACHUSETTS.

Letters Patent No. 114.193, dated April 25, 1871.

IMPROVEMENT IN DRILL-CYLINDERS.

The Schedule referred to in these Letters Patent and making part of the lame.

To all whom it 'may concern:

Be it known that I, CHARLES S. PATtrIsoN, of North Adams, in the county of Berkshire and State of Massachusetts, have invented an Improvement iu DrillCylinders; and I do hereby declare that the following, takeu in connection with the drawing which accompanies and forms part of this specification, is a description of' my invention sucient to enable those skilled in the art to practice it.

In the construction ofthe cylinders of rock-drilling engines of that class, instances of which are shown in United States patents Nos. 59,960 and and which are particularly well known as Burleigh rockdrills, it has been customary (until my invention) to bolt or screw the upper and lower cylinder-heads to flanges at the adjacent ends of the cylinder, and under the unavoidable occasional blows of the pistonagainst the lower head breakage occurs, the strain upon the head rupturing the cylinder back of the flange, or somewhere between the opposite heads, of course ruining the cylinder.

These breakages have been so constant as to seriously delay progress in. important rock-drilling operations where these drills,have been in use, and have detracted in a very great measure from the practical utility ofthe drills.

The cylinders are cast-iron, and in my improvement I re-enforce the cylinder by means of wrought-iron straps, ties, or rods, or encom passing jackets, by means of which the strain is transferred from the cast or granulated metal to the wrought or fibrous metal; and

My nventionconsists in a drilling-engine cylinder, the lower head of which is united or held to the body by means of wrought-iron rods, straps, or other wrought-.metal connections.

The drawing represents a drilling-engine cylinder embodying my invention.

A shows a plan of the cylinder;

B is au end view of it;

C, a side elevation of it;

a denotes the cylinder;

b c, the end ilauges thereof;

d, the lower cylinder-head; and

e, the upper cylinder-head.

From the head e to the head d I extend wrought-- iron rods g, having heads at one end and screw-threads at their opposite ends, with tightening-nuts h, so that the two ends of the cylinder are directly bolted together, and the strain is spentupon these rods instead of Vupon the cylinder.

Instead of extending these rods from head to head, however, they may extend from wrought-iron strapplates t' fi. through the flange b and head d, the straps being bolted to the cylinder by b olts lt or this wrought-iron strap may be an encompassing or partially encompassing wrought-iron ring or. cylinder, bolted at its front end t0 the head d, and at its opposite end or at its sides to the head e or flange c, or to a ange ortlanges ou the sides of the cylinder` Thus strengthened or re-enforced, no rupture ofthe cylinder ever occurs or can occur, as the strain is spent upon the wrought-metal bands, ties, or straps.

The blow ofthe piston against the head occurs when the drill-point fails to strike the rock, the piston-rod then driving forward until the piston brings` up against the head.

I claim- In a cylinder, in which works the piston of a drillcarrying pist0n-rod, the re-enforcing connections, substantially as shown and described.

Executed December 26, A. D. 1870.

CHARLES S. PATTISON.

Witnesses:

WM. P. PORTER, Unas. N. VAN DE MARK.

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