US1087632A

US1087632A - Rock-drilling machine.

Info

Publication number: US1087632A
Application number: US70404812A
Authority: US
Inventors: William S Benjamin
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-06-17
Filing date: 1912-06-17
Publication date: 1914-02-17
Anticipated expiration: 1931-02-17

Description

W. S. BENJAMIN.

ROCK DRILLING MACHINE.

APPLICATION FILED JUNE 17, 1912.

1,087,632. Patented Feb. 17, 1914.

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ll/W/i'amci 56/7 'am/fa WILLIAM S. BENJAMIN, 01E SEATTLE, WASHINGTON.

ROCK-DRILLING MACHINE.

Specification of Letters Patent.

Patented Feb. 17, 1914.

Application filed June 17, 1912. Serial No. 704,048.

To all whom it may concern Be it known that I, WILLIAM S. BENJA- MIN, a citizen of the United States, residing at Seattle, in the county of King and State of \Vashington, have invented certain new and useful Improvements in Rock-Drilling Machines, of which the following is a specification. V

This invention relates to improvements in rock drilling machines, and is intended more especially for submarine Work, although it may advantageously be used in other situations.

The object of the invention is to provide an efiicient machine of this character which will be of simple construction, easy to operate, and not liable to become deranged when subjected to rough usage.

The invention consists in certain structural features and combinations thereof, substantially as hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a longitudinal vertical section of an embodiment of the present invention. Fig. 2 is a view of the same shown partly in elevation and partly in section.

In carrying out my invention, I provide a bored barrel which, for convenience of manufacture, is desirably composed of two parts 1 and 2 rigidly connected together. Extending into the bore 3 of the lower barrel part 2 is a reciprocating percussive memher 4, and a heavy piston 5, or hammer as it will hereinafter be called, within the other part 1. Detachably secured, as by pins 6, to the lower end of the percussive member is a head 7 which is rovided at its center with a socket 8 for a rill-bit 9 of a length to extend from a distance below said head up into a recess 10 provided in the adjacent end of said member. The drill-bit 9 is desirably made of a single piece and is formed with a plurality of radially disposed blades 9 at its lower end and above such blades the bit is provided with an axially disposed passage 9 which communicates with the various angular spaces afforded between said bit blades. The head 7 has in its under side a number of grooves 11 arranged radially or approximately so, to the axis of the head. Removably seated within these head-grooves are cutter elements 12 which are each secured in its respective grooves in any suitable manner as by a key 13.

15 represents a cover plate for the barrel part 1 and extending axially through this plate, the piston 5 and the member 4 is a pipe 16 which extends from the bit 9 to an elevatlon in proximity to the surface of the water in which the machine is operating.

Packing rings

17 and 17 are provided between the .inner and outer peripheral walls of member 4 and hammer 5 to prevent leakage of the actuating fluid between these parts and the pipe and barrel walls.

Rigidly connected to the barrel or to the cover plate 15 thereof is a cylinder 18 which is divided by a partition 19 into an upper chamber 20 and avalve chamber 21 therebelow.

I 22 represents a pipe for the motive fluid, preferably compressed air, supplied to the upper end of chamber 21, from an air compressor positioned upon a float or vessel (not shown) which likewise carries hoisting apparatus for controlling the lines 23 Whereby the machine is suspended while being lowered to the surface of the rock to be drilled. After being so lowered suflicient tension is maintained on the lines to retain the machine in upright position until at least it has entered the rock sufi'iciently to be held upright by the drilled hole. Adjacent to the lower end of the valve chamber 21 is a port 24 which is connected by a passage 24 with the bore of the barrel at or about the plane of the upper end of the member 4 when the same is in its uppermost position with respect to the barrel. Intermediate the openings of said supply pipe and the passage 24 into the valve chamber, the latter is provided with an exhaust port 25 which leads into a pipe 25' which discharges into the pipe 16 and serves as an ejector element whereby the column of water within the pipe 16 is induced to ascend by the discharges from the pipe 25 and whereby the comminuted rock, as broken away by the drill bit 9 and cutter elements, are carried upwardly with the water and discharged from the upper end of the pipe 16.

In order to prevent the water from flowing through pipe 25 into the valve chamber, I provide a non-return valve inthis pipe positioned within a nozzle end 25 of the pipe. In proximity to the upper end of the valve chamber 21 is a port 27 which communicates by a passage 27 and a port 27 with the barrel-bore at a short distance below the cover plate 15 of saline. At a extends to an opening 28 near the conclusion of the other stroke,

r Fig. 1. As,

higher elevation than the port 24: ofpassage 24! is a port 28 of a passage 28' which the upper end of the chamber 20. Fitted for reciprocation within this chamber is a piston 29 which is connected by a stem 30 extending through a packing box provided in the partition 19 with a slide valve 31 provided in the chamber 21'. 'Interposed between the piston 29 and said partition is a helical spring 32 which tends to urge the piston and the slide valve upwardly to occupy the positions in which they are represented in I illustrated, said slide valve consists of a c lindrical body of a length approximating the distance between the port 22' of the air supply pipe 22 and the port 24 of the passage 24' which communicates with the barrel-bore. The valve is characterized by having a by-pass 31' extending through its entire length and by being provided with a peripheral recess 31 of suflicient length to connect the

ports

24 and 25 of the respective passages when the valve is at the lower end of its travel as shown in Fig; 2.

4: represents a collar formedon or rigidly secured to said percussive member and is operable within a counter-bore 3 of the barrel to limit the strokes of the percussive member by encountering an end of such counter-bore at the termination of one stroke and being, upon occasion, arrested at by an elastic bumper-ring 33 which is supported by an annulus 35 secured to the under side of the barrel as indicated in Fig. 1. The bumper ring- 33 is, however, brought into play only when the machine is actuated while away from the work and is designed to prevent any undue impact being then delivered to the machine structure. I I

An exhaust pipe 36 leads from the upper end of the chamber 20 to the main exhaust pipe 25'. Included in the pipe 36 is an adjustable valve. 36' whereby the discharge opening through this pipe may be regulated to a relatively small size and through which the air which may be present within the chamber will flow sluggishly therefrom and consequently act as a cushion to retard the upward movements of the piston 29 in opposition to the power exercised by the spring 30.

The operation of the afore described portion of the invention is as follows: Assuming the various parts are in the positions in which they are represented in Fig. 1, compressed air is supplied through pipe 22 to the upper end of the chamber 21 whence it flows through the by-pass 31 of valve31 to the underside of the latter and thence is led by passage 24' to the underside of the hammer 5 to eifect the raising of the same. As hammer 5 moves upwardly the port 28 is exposed and the actuating fluid escapes by way of passage 28 into the upper end of previously admitted mamas chamber 20, resulting in the building up of a fluid pressure above piston29 which will overcome the power of spring 30 and cause the piston to descend accompanied by the valve 31 into the position which they occupy in Fig. 2. During the ultimate portion of the dowlistroke of the valve, however, the port 27 has been closed with respect to the flow of air from the upper end of barrel-port 1 to the exhaust pipe 25; 'The residual air within the barrel and above the hammer is compressed by the further upward travel of the hammer and afiords a cushion to gradually arrest the motion ofv the hammer and finally reacting, and supplemented by the weight of the hammer, the latter is forced down below the .port 27 whereupon and by ing now uncovered by valve 31 air under pressure is delivered through passage 27 to the space above the hammer to accelerate the speed of the hammer and thereby impel reason of the port 27 be it with relatively high velocity and power against the percussive member 4 which, in turn, strikes, so to speak, the bottom of the hole being bored.' As the hammer descends the air therebelow will obviously escape through the passage 24 about the peripheral recess 31 of the valve see Fig. 2) and into exhaust pipe 25. During the downward, or striking, movement of the hammer the air to the upper end of chamber 20,escapes through the pipe 36 whereupon the spring 32' asserts its-power to elevate the piston 29 and thus restore the valve 31 to the position which it occupied at the beginning of the above described cycle of operation.

In the operation of this machine, the weight thereof bears against the work, and when the hammer 5. strikes the percussive member 4 the latter is first driven down followed by the barrel and the parts connected thereto and delivering a second blow to the percussive member through the medium of the collar 4'. recoil of the percussive member 1s practically eliminated and the drilling of a hole with a machine is rendered much more rapid, as not only the momentum of said member is utilized but the weight of the entire machine is applied therewith or supplemented thereto.

What I claim, is

1. In a drilling machine, the combination of a barrel, a piston hammer and a percussive member in the barrel, a collar provided on said member and engageabl'e bythe barrel and means provided on the barrel and engageable by said collar for limiting the forward stroke of said member, a valve chamber, passages connecting the interior of the barrel with the valve chamber, inlet and outlet openings for said chamber, a

valve in said chamber for controlling said with a barrel, a

assa es and o enin s, a s rin o eratively sonnefited vith the va ilve fdi'yitfidi gly holding said valve in position to afl'ord a supply of the motive fluid to said barrel to effeet the elevation of the piston-hammer, and means controlled by the latter when it approaches the upper end of its reverse stroke whereb the motive fluid is applied to the piston hammer to effect the forward stroke of the same.

2. In a drilling machine, the combination piston hammer arranged for reciprocatory movements therein and a percussive member extending into said barrel a cylinder secured to said barrel and divided into two chambers, passages connecting the lower of said chambers with the interior of the barrel, openings provided for the supply and exhaust of the motive fluid to and from said lower chamber, a valve in the lower chamber, a piston in the upper of said chambers, a stem operatively connecting the valve with said piston, a spring acting to elevate said piston and valve, a passage connecting the interior of the barrel with the upper chamber and above the piston therein, and a valve controlled exhaust passage leading from the upper end of said upper chamber, substantially as and for the purposes described.

3. In a drilling machine, the combination with a barrel, a reclprocatory movements thereln, and a perpiston hammer arranged for cussive member extending into said barrel, a cylinder secured to said barrel and divided into two chambers, a passage from a point adjacent the bottom of said lower chamber to a bottom from a point removed from the top of said lower chamber to a point slightly removed from the top of said lower chamber, ports provided for the su ply and exhaust of the motive fluid to and .om said lower chamber positioned adjacent the top and the middle points thereof respectively, a valve in the lower chamber having a by-pass therethrough and a peripheral recess therearound, a piston in the upper one of said chambers, a stem operatively connecting the valve with said piston, a spring acting to elevate said piston and valve, a passage connecting the interior of the barrel with the upper chamber and above the piston therein, a valve-controlled exhaust passage leading from the upper end of said upper chamber.

Signed at Seattle, Washington, this 6th day of June, 1912.

WILLIAM S. BENJAMIN.

Witnesses:

PIERRE BARNES, J. V. Woonwann.

point in said barrel, a passage