US1740687A - Drilling mechanism - Google Patents

Description

f n 156e. 24, 1929.

E. G. GARTIN DRILLING MECHANISM Filed Deo. 13, 192:5

"In Oli! IGII TTES

PATNT OFFICE ELT/[EIR- G. GARTEN, OF CLAREMONT, NEW HAMPSHRE, ASSGNOR, TO SULLIVAN MA.- CHNERY COMPANY, A CORPOEATON F MASSACHUSETTS DRILLING MECHANSM Application filed December 13, 1923. Serial No. 680,523.

lily invention relates to drilling mechanisms.

An object of my invention is to provide an improved drilling mechanism and more particularly a rock drilling mechanism having improved cleansing 'fluid supply means therefor. Another object ot my invention is to provide an improved drilling mechanism of the pressure fluid percussive type especially adapted tor rock drilling purposes whereby improved means for supplying cleansing iluid.

to the drill steel are provided. A still further object of my invention is to provide an improved pressure fluidY percussive tool provided with a hammer piston adapted to actuate a drill steel whereby improved means are provided for supplementing the cleansing iuid supply to the drill steel for removing the cuttings 'from the drill hole. ,These and other objects and advantages of my invention will, however, hereinafter more fully appear.

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

ln these drawings,-

Fig. 1 is a. central longitudinal vertical sectional-view through a drilling mechanism in which one form ot my improved mechanism is incorporated, the view being partially in side elevation.

Fig. 2 is a view similar to that shown in Fig. 1, with partsl assuming ditlerent posi-- tions, the forward end of thedrilling mechanism being broken away to `facilitate illustration.

In this illustrative embodiment of my invention l have shown a drilling mechanism of the pressure fluid percussive type, generally indicated by 1, comprising a cylinder 2 having a bore 3 in which a piston lis reciprocable and adapted to percussively -actuate a drill steel 5 carried in a chuck 6 suitably arranged within the `iront end of the drill. rlhe ends ot the bore 3 are closed by suitable head members 7 and 8, the head 'l' being held in the desired assembled relation in any well known manner, while the head 8 is -forged integral with the cylinder. llecein, pressure is adapted to be distr4 into the rear head 7.

the opposite ends of the cylinder' 2 by way of distribution passages 9 and 10 leading to the opposite ends ot' the cylinder bore 3, these passages 9 and 10 being adapted to be connected alternately to supply and exhaust by means or' a suitable valve mechanism, generally designated 11, in which a valve ot' the multiple spool type (not shown) is adapted to be reciproca-ted under the control of longitudinally spaced reverse or throw passages 12 and 13 controlled by the piston leading from opposite ends ot' the valve to the cylinder bore in the usual manner. Pressure fluid is adapted to be admitted to the valve mechanism through a pipe connection 1l from any suitable source o supply under the control of a throttle valve mechanism 15 suitablyarranged within the back head 7.

In my improved constructionv it will be observed that a plurality of longitudinally eX- tending concentric tubular members 16 and 17 are rigidly held in the desired relation by means of a gland plug 18 suitably threaded These tubes 16 and 17 are provided at the rear ends with langes or heads 19 and 2O held in spaced relation by means of rubber washers or packings 21, in a well known manner. Herein, the air tube 16 extends longitudinally, terminating at its tree end in a bore 22 formed in the front end of the piston l and which has a running tit therewith. This bore 2:2 in turn communi- Cates with an enlarged annular chamber a8 formed contiguous to the shank of the drill steel to which pressure fluid is constantly supplied from an annular chamber 24C at the rear end of the tube communicating with the tube 16 and bore 22 under the control of the throttle valve 15. A cleansing liquid, herein water, is adapted to be admitted under pressure to the tube V17 through a pipe connection 25 from a suitable source of supply.

This water tube 17 extends coaXially through the air tube 16 and drilling motor and terminates at its free end in a longitudinally extending aperture or bore 26 Jformed coaxially through the drill steel 5. Herein, it will be noted that the rear end of the bore Q2 in the piston Ll terminates in an enlarged here 2? 'which communicates 'withthe rear Cil end ofthe cylinder by way of a slot or groove 28 formed in the piston. It will further be noted that the drill steel 5 is adapted to be intermittently rotated by means of usual ratchet and pawl mechanism, generally designated 29, carried at the rear end of the cylinder and including a forwardly extending spirally grooved rifle bar which cooperates with a rifle nut 3l suitably secured withthe rear end of the piston d. The striking bar 32 of the piston is provided with straight longitudinally extending grooves or flutes 33 which cooperate with a chuck nut 34e suitably secured within the drill steel receiving chuck 6. It will be evident that when the piston reciprocates it is intermittently rotated by the rifle bar and this intermittent rotation is transmitted by means of the grooves in the striking bar cooperating with the chuck nut to the chuck 6 and hence to the drill steel.

In the operation of my improved mechanism it will be noted that the throttle valve l5 is manipulated by the operator admitting fluid pressure t-o the valve mechanism ll which distributes the pressure alternately to the passages 9 and l0 causing reciprocation of the piston l which actuates the drill steel 5. It will also be evident that the grooves in the striking bar of the piston intermittently communicate with the forward end of the cylinder, thus permitting motive fluid to be conducted through the chamber 23 and hence to the hollow drill steel. Pressure fluid is also admitted to the tubular member 16, bore 22, chamber 23, to the aperture 26 in the drill steel with which liquid cleansing fluid admitted through the tube 17 intermingles and passes to the bottom of the drill hole, removing the cuttings therefrom. To supplement this cleansing fluid supply to the drill hole, I have terminated the free end of the tubular member 16 at such a distance within the bore 22 that, just previous to the exhaust of the rear end of the cylinder, the forward end of the tube runs out of the bore 22, opening communication from the rea-r end of the cylinder to the bore 22 by way of the groove 28 and the bore 27. This causes an intermittent supply of pressure fluid to the drill steel as the piston approaches the forward end of its stroke, when an increased amount of pressure fluid will iiow through the bore 22 until the cylinder pressure has been materially reduced by exhaust.

As a result of my improvement a drilling mechanism having improved cleansing means of a simple, compact nature is provided whereby the supply of cleansing fluid through the air and water tubes is supplemented by an intermittent supply of pressure fluid controlled by the hammer piston. It will further be noted that improved cleansing means are provided which permit an intermittent supply of exhaust pressure fluid from the motor cylinder supplemental to the liquid and pressure fluid supply through the tubes thereby facilitating the drilling of deep holes. Further, it will be noted that this mechanism may be applied to a machine of standard form with a minimum of change. These and other advantages of my improvement will be clearly apparent to those skilled in the art.

ldhile I have in this application specifically described one form which my invention may assume in practice,it will be understood that this form 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.

l/Vhat- I claim as new and desire to secure by Letters Patent is:

l. In a drilling mechanism, a cylinder, a piston reciprocable therein, a liquid tube and a pressure fluid conducting tube for supplying cleansing fluid to a bore in a drill steel independently of the supply of piston actuating fluid to the cylinder and means provided by said piston and cooperating directly with one of said tubes for intermittently supplementing said cleansing fluid supply.

2. In a drilling mechanism, a cylinder, a piston reciprocable therein, means for supplying cleansing liquid and gaseous fluid to al hollow drill steel including coaxially ar-.

ranged supply tubes extending within said piston, and means formed in said piston and cooperating with one of said tubes for intermittently opening communication between the rear end of said cylinder and the hollow drill steel for supplementing said gaseous cleansing fluid supply.

3. In a drilling mechanism, a cylinder, a piston reciprocable therein and having a bore, means for supplying cleansing liuid to a hollow drill steel independently of the supply of piston actuating fluid to the cylinder including coaXially arranged tubes eX- tending within the bore in-said piston, and means formed in said piston and cooperating directly with one of said tubes for intermittently supplementing the supply of cleansing fluid through the bore in said piston.

4f. In a drilling mechanism, a cylinder, a piston reciprocable therein having a bore, means for supplying cleansing liquid and gaseous fluid to a hollow drill steel including inner and outer supply tubes having free ends extending within the bore in said piston, the free end of t-he outer one of said tubes terminating within said piston, and means permitting intermittent withdrawal of the free end of the outer tube'from the bore in said piston during normal operation of the latter for supplementing said gaseous cleansing Huid supply.

5. In a drilling mechanism, a cylinder, a piston reciprocable therein, means including inner and outer tubes for supplying liquid and gaseous fluid to a bore in a drill steel, and means provided by said piston controlled by movement thereof and cooperating directly with said outer tube for intermittently su pplementing said fluid supply.

6. In a. drilling mechanism, a. cylinder, a piston reciprocable therein having a bore, means for supplying cleansing liquid and gaseous fluid to a hollow drill steel comprising coaxially arranged supply tubes having free ends extending within the bore in said piston, and means permitting the intermittent withdrawal of the free end of one of said tubes from said piston during normal opera.- tion of the latter' for supplementing` said gaseous fluid supply.

7. In a drilling` mechanism, a cylinder, a piston reciprocable therein providing fluid conducting means communicable with the cylinder for portions only of each piston stroke and adapted respectively to intermittently supply cleansing fluid from opposite ends of said cylinder to a hollow drill steel during normal operation thereof, and supplemental cleansing fluid supply means comprising coa-Xially arranged liquid and gaseous fluid supply tubes extending forwardly within said piston.

8. In a drilling mechanism, a cylinder, a oiston reciprocable therein, means controlled by said piston for supplying cleansing fluid from the forward end of said cylinder to a hollow drill steel, means for supplying liquid and gaseous cleansing fluid to the hollow drill steel comprising coaxially arranged tubes eX- tending within said piston, and means controlled by said piston for intermittently supplying cleansing liuid from the rear end of said cylinder to supplement said gaseous fluid supply during a part only of each forward movement of the piston.

9. In a drilling mechanism, a cylinder, a piston reciprocable therein, means controlled by said piston for supplying cleansing fluid from the forward end of said cylinder to a hollow drill steel, means for supplying liquid and gaseous cleansing fluid to the hollow drill steel comprising coaxially arranged tubes extending within said piston, and means controlled by cooperation between said piston and one of said tubes for intermittently supplying cleansing fluid from the rear end of said cylinder to supplement said gaseous fluid supply during a part only of each forward movement of the piston.

10. In a drilling mechanism, a cylinder, a piston reciprocable therein, and means for supplying cleansing fluid to a bore in a drill steel including a plurality of tubes, each connected to a continuous fluid supply, said piston having a bore therethrough for slidaloly receiving one of said tubes, the latter being of such length that it is positioned entirely out of said bore during a portion of the piston stroke to establish communication by way of the piston bore between the cylinder and the drill steel bore to supplement the cleansing lluid supplied by said tubes.

1l. In a drilling mechanism, a cylinder, a piston reciprocable therein and having a bore therethrough, and means for supplying cleansing fluid to a bore in a drill steel, including a tube extending into said cylinder and connected to a constant supply of gaseous fluid, said tube at its free end slidably fitting in said piston bore during a portion only of the piston stroke and said bore conducting fluid from the cylinder during the remainder of the piston stroke for suppleinenting the cleansing fluid supplied through said tube.

l2. In a drilling mechanism, a cylinder, a piston reciprocable therein having a bore therethrough, and means for supplying cleansing fluid to a bore in a drill steel, including concentric tubes extending into said cylinder, the inner of said tubes being connected to a constant liquid supply and eX- tending at all times through said piston bore, the outer of said tubes being connected to 'a constant gaseous supply and at its free end slidaloly fitting in the piston bore when the piston is in the rear end of the cylinder but free from said bore when the piston is in the forward end of the cylinder so that pressure actuating fluid may be intermittently supplied through the piston to supplement the cleansing fluid supplied through said tubes.

In testimony whereof I ax my signature.

ELMER G. GARTIN.

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