US349409A

US349409A - Henry c

Info

Publication number: US349409A
Authority: US
Publication date: 1886-09-21
Anticipated expiration: 1903-09-21

Description

' (No Model.)

H. c. SERGEANT.

ROCK DRILL.

No. 349,409. Patented Sept. g1, 1886.

UNITED. STATES "PATENT OFFICE.

HENRY O. SERGEA'NT, OF NEXV YORK, N. Y.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent 110,349,409, dated September 21, 1886.

Application filed January 2, 1886. Serial No. 187,402.

To all whom it may concern:

Be it known that I, HENRY O. SERGEANT, of New York, in the county of New York and State of New York, have invented a new and useful Improvement in Rock-Drills, of which the following is a specification.

In rock-drills as heretofore constructed it has been common to provide an india-rubber buffer or cushion, which will serve to diminish the shock in case of the piston striking vat the end of the cylinder, and will prevent the piston from knocking out or breaking the cylinder-head.

It is well known that india-rubber, although it may be readily compressed in one direction, requires room for expansion in another direction, and hence if a disk of india-rubber be compressed by a bolt upon its face it will expand laterally or radially so as to enlarge its diameter, and may burst the part which surrounds it and keeps it in place.

The object of my invention is to enable the buffer-case, or that part whichhas the bufl'er inclosed within it, to be made separate from and independent of the cylinder and its lower end, so that if broken it may be renewed at a very much less cost than renewing the whole cylinder or its lower head, and so that it may be made of a metal stronger than cast-iron and less likely to be broken than the cylinder or head.

The invention consists in the combination with the cylinder, its lower head, and thepiston of .a rock-drill, of an india-rubber buffer or cushion to check the motion of the piston, and a casing or frame surrounding the buffer and made separate from the cylinder and its lower head and serving to sustain the strain produced by the lateral expansion of the buffer.

The invention also consists in the combination, with a cylinder, piston, and lower head of a rock-drill, of an india-rubber buffer to der and head are both preferably provided with cylindric or circular projections at their (No model.)

adjacent ends, and the band or collar which is interposed between the head and cylinder is fitted to such circular projections, the cylinder, head, and band or collar all being secured together by means of the ordinary side bolts, which are provided in the drill.

In the accompanying drawings, Figure 1 is a longitudinal section of such portions of a drill as are necessary to illustrate my invention. Fig. 2 is a plan of the lower portion of the cylinder and the lower head, and Fig. 3 is a face view of the band or collar which is interposed between the head and cylinder.

Similar letters of reference designate corresponding parts in all the figures.

A designates the cylinder of a rock-drill, which may be of any suitable construction; and B designates a piston, from which extends apiston-rod, B, with which the drill-rod is to be connected.

0 designates an india-rubber buffer or cushion, which surrounds the piston-rod B, andwhich receives the impact of the piston in case it fails to change in the direction of its movement by the action of the valve of the drill, or by striking the rock.

In order to avoid the bursting of the drillcylinder or its lower head by the expansion of the rubber buffer or cushion, I arrange the latter beyond the end'of the cylinder, and I sustain the strain produced by the lateral expansion of the buffer or cushion bya casing or frame which is separate from and independent of the cylinder and lower head, and which may be renewed at a very much less expense than the cylinder or its head. I prefer to make this casing or frame D for the buffer in the form of a-band or collar, which is interposed between the lower head, E, and the end of the cylinder, as shown in Figs. 1 and 2.

. By making the casing or frame in the form of a band or collar, which is made separate from both the lower head and the cylinder, I not only make it in a piece which may be renewed independently of the cylinder, but I am also able to make it of forged steel oriron, or of any other metal, which will be far stronger than the cast-iron of which the cylinder is most advantageously made. i

The lower head, E, and the stuffing-box gland F, which is fitted thereto, are both represented as made in halves or divided axially, so that they may be readily applied to the piston-rod, having an integral piston at one end and at the other end an enlargement forming a chuck to receive the drill-rod.

In order to support the buffer or cushion I employ a divided ring, G, which surrounds the piston-rod B, and enters slightly into the cylinder A, the ring being provided with a flange, g, which bears against the end of the cylinder, and the buffer or cushion O is arranged between the ring G' and the lower head, E.

As shown in Fig. 1, the cylinder A and lower head, E, are formed with cylindric or eireular projections a e, and the band or collar D is fitted upon these projections, and by this means I am enabled to employ a buffer or cushion, O, of larger area than would be possible if it were arranged within the cylinder.

The band or collar D is provided, at diametrically-opposite points with lugs or ears (I, which receive the side bolts, H, whereby the heads of the cylinder are secured in place, and when the nuts upon these bolts are tightened it will be understood that the band or collar D is held tight-1y between the lower head, E, and the cylinder.

WVhat I claim as my invention,and desire to secure by Letters Patent, is-

1. The combination, with the cylinder, its lower head, and the piston of a rock-drill, of an india-rubber buffer, and a casing or frame surrounding the buffer and made separate from the cylinder and its lower-head, substantially as herein described.

2; The combination, with the cylinder, piston, and lower head of a'roek-drill, of an india-rubber bufi'er, and a casing or frame consisting of a collar or band, D, having a plain cylindrie interior surrounding the buffer and interposed between and made separate from the cylinder and head, substantially as herein described. y

3. The combination, with the cylinder and head of a rock-drill, both provided with cylindric or circular projections at their adjacent ends, of an india-rnbber buffer between the cylinder and head, and a band or collar interposed between and made separate from the cyl inder and head, and fitted to said circular projections, the said band or collar serving to sustain the strain produced by lateral expansion of the buffer, substantially as herein described.

O. HALL, FREDK. HAYNES.