US527078A - Percussion apparatus foe dbillinfl - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

PEROUS'SIQN-APPARATUS FOR DRILLING.

'N0.'527,078. Patented Oct. 9, 1894.

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. d afaapu (No Model.) M'AOE R 2 Sheets-Sheet 2. PERCUSSION APPARATUS FOR DRILLING.

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tented Oct. 9, 18:94.

mlllllli rrnn STATES PATENT nron.

'JAMES MAQ WAN Ross, on GLASGOW, SCOTLAND.

PERCUSSION APPARATUS FOR DRILLING.

SPECIFICATION forming part of Letters Patent No. 527,078, dated Qctober 9, 1894. Application filed May 12, 1894. Serial No. 511.060- (No'model-l Patented in England March 24, 1894, No. 6,105.

i To all whom it may concern:

Be it known that I, JAMES MAOEWAN Ross, engineer, a subject of the Queen of Great Britain, residing at Greenhead Works, Glasgow, in the county of Lanark, Scotland, have invented new and useful Improvements in Percussive Apparatus for Boring, Drilling, and Like Operations, (which have not been patented in any country except Great Britain by Letters Patent dated March 24, 1894, No. 6,105;) andI do'hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art or manufacture to which it relates to make and use the same. a

This invention relates to percussive apparatus for drilling, boring or mining andsimilar operations; and it consists in applying as the means for feeding the boring or drilling tools the pressure of the air,,steam or other fluid used for operating the apparatus.

In the accompanying drawings Figure. l'is a sectional plan showing a modification of my invention in which a single feeding tube is adjusting the position of the tool.

employed. Figs. 2 and 3 are respectively a sectional plan and elevation of another modification in which feed tubes are used. Fig. 4 shows in section a modification in which a duplex feed is provided. Fig. 5 is an elevation of similar apparatus in which is conjoined with the pneumatic feed means for Fig. 6 is an elevation showing a convenient mode of carrying the operating tool, and Fig. 7 shows a hand percussive tool with the pneumatic feed arrangement applied as acushion to prevent the concussion of the tool being communicated to the handof the operator.

In a simple form of the improved apparatus shown at Fig. 1 the cylinder or casing A within which the reciprocating piston B is fitted is placed or extended into an outer cylindrical casing or tube 0 and on its outer end or on the outer end of the extension A is secured a cup leather or other packing D closely fitting the internal diameter of the outer casing 0. Air, steam or other fluid under pressure used to operate the reciprocating piston Bis led through a small orifice b in the piston or liner to the rear of the cup leather or other packing D and serves to press on and feed forward the cylinder A of the C is held stationary by means of a crosshead socket piece or clamp F jointed to it and secured by a mine prop, tripod or other means. A handing wheel G is or may be secured on the tool holder E to turn the tool E between the blows of the piston hammer.

'In the modification shown at Figs. 2 and 3 the cylinder or casing A of the percussive apparatus is formed with two cylinders C 0 external toit one being on each side and parallel with the main cylinder. These cylinders 0 Care open at their lower ends to a space H around the tool holder or hammer which is in communication by a small orifice b with the air or steam space of the percussive apparatus; and in each cylinder is fitted a plunger rod or tube I closed at the lower end by a cup leather or other packing D. The air or steam pressure actingon the ends of these plungers tends to force them upward and this tendency being resisted by the plungers I whose outer ends are connected by a crosshead F carrying a socket piece F for a prop, tripod or other fixture, the main casing A carrying the piston hammer B and tool holder E is forced downward and serves to feed the boring or other tool E to its work.

As shown at Fig. 4 two or more tubesI, J

may be fitted one within the other in the form of telescopic plungers in order to provide for a greater range of feed with a limited length of the percussive apparatus, chains 0 being provided to limit the extent of movement of the tubes; or the same object may be attained by securing the feed cylinder or casing as shown at Fig. 5 in an adjustable clamp F sothat the casing A may be moved forward at intervals as required,'the clamp being secured on a prop K as shown at Fig. 6.

When the percussive boring or drilling apparatus is adapted to be held by a handle L as indicated at Fig. 7 the handle is fitted with plungers M fitted in cylindrical casings N formed on the main casing A of the apparatus and part of the motive fluid is admitted between the ends of these cylindrical casings and the ends of the plungers M to obviate or lessen concussion. 9

' Having now described the invention, what I desire to claim and secure by Letters Patent ist 1. In a percussion apparatus, the main cylinder, the drill carrier having limited move- 5 ment therein, the piston hammer adapted to contact with the drill carrier, ports for admitting fluid to reciprocate said piston, and the auxiliary cylinder and piston having ports whereby a portion of the motive fluid 10 is utilized to keep the drill pressed constantly against the surface to be operated upon, substantially as described.

2. In combination, the main cylinder, the drill carrier having limited movement there- 15 in, the reciprocating piston hammer co-operating with said spindle, ports for admitting the motive fluid to reciprocate said piston, the auxiliary cylinder having constant communication with the motive fluid supply, and the rigid piston extending from the drill support into the supplemental cylinder, substantially as described.

In witness whereof I have hereunto set my hand and seal the 20th day of April, 1894.

JAMES MACEWAN ROSS. [L. S.]

VVitne-sses:

WALLACE FAIRWEATHER, C. E., Chartered Patent Agent, 62 St. Vincent Street, Glasgow.

THOS. THOMSON, Cashier, 62 St. Vincent Street, Glasgow.

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