US1662801A - Drilling apparatus - Google Patents

Description

March 13, 1928. 1,662,801

I H. H. MERCER DR ILLING APPARATUS Filed July 26, 1927 raven/2W7": fkiWg li Nerve r.

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Patented Mar. 13, 1928.

UNITED STATES PATENT'OFFICE.

HENRY H. MERGER, F CLAREMONT, NEW HAMPSHIRE, ASSiGNOR TO SULLIVAN MACHINERY COMPANY, A. CORPORATION OF MASSACHUSETTS.

DRILLING ArPAnArus.

Application filed July 26, 1927. Serial No. 208,599.

My invention relatesto drilling apparatus and ynirticularly to a combined drill steel actuating and cleansing fluid pumping means. 1

It has for an objectto provide improved drilling apparatus particularly adapted for drilling large holes of relatively great depth. Another object is to provide improved steel reciprocating andcleansing fluid pumping means for the type of drilling apparatus disclosed in my copending application Ser. No i l-2,337, filed October 8, 1924-, to allow the same to handle greater lengths of drillrods and to drill deepe'r holes. A further object is to produce a more effective pumping action whereby cleansing fluid at. a higher pressure is available for cleansing the hole. Other objects and advantages will, however, hereinafter more fully appear.

In the accompanying drawings I have shown for purposes of illustration one form which my invention may assume in practice.

in these drawings,--

Fig. l is an elevation view of a portion of a drilling apparatus with my improved steel reciprocating and cleansing fluid pumping means associated therewith, parts being broken away to facilitate illustration.

Fig. 2 is a central vertical section through my improved steel reciprocating and fluid pumping device on the line 22 of Fig. 1.

In this illustrative embodiment of my invention I have shown a part of the frame of the drilling machine designated as 1 upon which vertical supporting and guiding standards 2 are secured in the manner described in my copending application above identified. The drill steel actuating 1nechanism is carried in a frame including upper and lower head members 3 and 4 slidahly mounted upon the vertical supporting standards 2 by means of bearing and guiding portions 5 in the head members. These upper and lower head members are secured together by means of vertical rods Sand suitable retaining means such as nuts 7;

For the purpose of actuating the drill steel a crank shaft 8 is mountedinthe upper head member 3 and driven from a suitable source of power by mechanism fully describedin my above identified application;

lower end to the chuck member 11.

ends by upper and lower cylinder heads 18 and 19, respectively, and by means of an intermediate head 20 common to the upper and lower sets of cylinders. A supplemental upper head 21 is mounted ad acent the head 19 for the purpose of providing a compressed fluid receiving chamber 22. All of these head members and cylinders are secured together by a plurality of longitudinal bolts 23, which extend through the head members between the outer and inner cylinder members. A piston 24 reciprocatcs within the lower cylinder 14 and a second piston 25 reciprocates within the upper cylinder 17, both of these pistons being secured to a common piston rod 26 secured at its Stub shafts 27 project outwardly from the intermediate head at diametrically opposite points and to these shafts are connected the rod bearings 28. Also formed integral with each of these stub shaftsare guiding memhers 29, shown in Fig. 1. Each of these guide members is provided with a semicylindrical recess 30 adapted to be slidably gLHClQd upon guiding sleeves 31 surrounding each. of the retaining rods 6, and loosely mounted thereon so that they may be rotated relative to the shaft 6 at frequent intervals to prevent excessive wear upon only one side.

. Inlet ports 32 in the lowercylinder head member controlled by valves 33 serve to admit air to the lower end of the lower-cylinder. The inlet means for the upper end of this cylinder comprise passages 34 leading into a hollow portion of the intermediate head 20 through the stub shafts 27, inlet ports 35 and valves 36. The hollow chamber 37 in the intermediatehcad serves as a storage chamber and tends to equalize the flow of air through the passages 84. Air discharged from the lower cylinder through discharge ports 38 controlled by valves 39 and is conducted by way of the annular space between. the cylinders 13 and ill? cylinder elements.

lt through passages 40 in the intermediate cylinder head into the annular space hetweenthe upper cylinders 15 and 16,v by way of passages 41 controlled by valves 42, to the lower end of the upper or high pressure cylinder 17, and into the upper end of this same cylinder through passages d3 controlled by valves 44. Air is discharged from the upper and lower ends of the high pres sure cylinder through ports 45 controlled by valves 45 into the annular space between the cyliiiders 16 and 17 through the passages 46 into the receiver chamber 22.

Suitable means are provided for regulating the discharge of air from the chamber 22 which comprises an outer sleeve member 47 provided with slots 48 threaded into the head member 21, and an inner sleeve 19 providedwithoslots 50 which are adapted to register with the slots e8, this inner sleeve member being secured to a cap51 by means of a stud bolt 52. The cap member 51 is threaded on the end of the outer sleeve member and may be clamped thereto by means of a clamping device 53. It will be noted thatupon loosening the clamping dcvice 53 and stud bolt 52 the sleeves may be adjusted relative to one another to control the extent of the opening between the receiver chamber 22jand the interior of the inner sleeve.

It will be observed that the piston rod 26 is hollow throughout its entire length and terminates at its upper end within the interior of the inner sleeve 19. A casing 54L is secured to the upper and lower head members 3 and 4, respectively, which encloses the entire mechanism and prevents the entrance of abrasive material. 7

In operation, the connecting rods 9 will be positively reciprocated by the crank shaft 8,-this motion being transmitted directly to the intermediate head 20 and all of the The pistons and piston rod, being free to move relativeto the cylinder meinbers,will tend to move in a downward direction when the cylinder is being lifted and thus the upward movement of the drill chuck will be somewhat later than the movement of the connecting rods. Also when the downward movement of the drill chuck is resisted by an outside force as when the, drill bit delivers a blow, the cylinder elements will move downward relative to the pistons and piston rod. This action will continuously pump air through the ports 32 and 35 into the lower cylinder where it will be compressed a certain amount, the same being discharged into the upper cylinder through passages 41 and 43 where it will be compressed to a considerably higher pres sure, and discharged into the receiver chamber 22." This compressing action will apply a yielding resistance to the relative movement between the cylinder and piston elements and it will be observed that the discharge ports are spaced at a distance "from the ends of the cylinders so that when the piston overruns these ports a certain amount of air will be trapped to serve as a pneumatic cushion, thus insuring against the possibility of the piston striking against the cylinder heads. This pneumatic connection between the positively driven element and the drill bit is very essential in order to produce an effective blow. it the same time increased, thereby eiiecting a correspomling increase in the pneumatic resistance to rcla tive movement of the cylinder and piston elements, which will enable the machine to successfully operate with a greater length oi drillv rods and at the same time provide the desired flexibility between the positive drive element and drill chuck. Also by reason of this compound action cleansing fluid is available at considerably higher pressures so that the cuttings from a deep hole may he more effectively removed.

lVhile I have in this application specifically described one form which my invention may assume in practice, it will be undcrstood that this form of: the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

lVhat I claim as new and desire to secure by Letters Patent is:

1. A rock drilling apparatus comprising a poi'ver reciprocated member, a drill steel actuated thereby, means [for providing a pneumatic connection between said member and said steel comprising a plurality of cylinders and pistons cooperating therewith, and fluid conducting and valve means associated with said cylinders and pistons whereby they act as a, compound fluid compressor pump.

2. A rock drilling apparatus comprising a power reciprocated member, a drill stccl actuated thereby, means for providing av pneumatic connection between said member and said steel comprising a plurality of cylinders and pistons cooperating therewith. fluid conducting and valve means associated with said cylinders and pistons whereby they act as a compound fluid compressor pump, and means for conducting fluid discharged from said pump to a bore in the drill steel.

8. A rock drilling apparatus comprising a power reciprocated member, a drill steel actuated thereby, means for providing a pneumatic connection between said memher and said steel comprising a plurality of cylinders and pistons cooperating therewith, fluid conducting and valve means associated with said cylinders and pistons whereby they act as a compound fluid compressor pump, and means for controlling the discharge pressure of said pump.

4:. A rock drilling apparatus comprising a power reciprocated member, a drill steel actuated thereby, means for providing a pneumatic connection between said member and said steel comprising a plurality of cylinders and pistons cooperating therewith, and means for conducting tluid discharge from one cylinder into another cylinder whereby said second cylinder and piston are sub jected to higher working pressures.

5. A rock drilling apparatus comprising a power reciprocated member, a drill steel actuated thereby, means for providing a pneumatic connection between said member and said steel comprising a plurality of cylinders and pistons coo} 3erating therewith, means for conducting fluid discharge from one cylinder into another cylinder whereby.

said second cylinder and piston are subjected to higher working pressures, and means for conducting pressure fluid from said second cylinder to a bore in the drill steel for cleansing the hole.

6. A rock drilling apparatus comprising a power reciprocated member, a drill steel aotuated thereby, means for providing a pneumatic connection between said member and said steel comprising a pluralityof cylinders and pistons cooperating therewith, and fluid conducting and valve means associated with said cylinders and pistons whereby they act as a compound fluid compressor pump, each of said pump cylinders being double acting.

7. A rock drilling apparatus comprising a power reciprocated member, a drill steel actuated thereby, and means for providing a pneumatic connection between said member and said steel comprising a plurality of cylinder and piston pumping elements connected in tandem compound relation.

8. A rock drilling apparatus comprising a power reciprocated member, a drill. steel actuated thereby, means for providing a pneumatic connection between said member and said steel comprising a plurality of cylinders mounted in tandem and movable with said member, pistons cooperating with said cylinders and movable with the drill steel, and fluid pressure means acting on said pistons, the pressure acting on one piston being higher than the pressure acting on another.

9. In a drilling apparatus, combined steel reciprocating and cleansing fluid pumping means comprising a positively reciprocated member, a drill steel actuated thereby, and means for providing a yielding connection between said member and said steel comprising a plurality of cylinders and pistons cooperating therewith. said cylinders and pistons constituting double acting pumping elements on relative movement of said mem her and said steel, the air supplied to one of said cylinders being higher than atmospheric pressure.

In testimony whereof I aiiix my signature.

HENRY H. MERCER.

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