US1760354A - Rock-drilling mechanism - Google Patents

Description

f fw? 'ff 193530 May 27, 1930. E. G. GARTIN 1,760,354

ROCK DRILLING MECHANI SM Filed sept. 25. 1925 3W f Innen/20?.-

Patented May 27, 1930 l IIED STATES A ELITIIB. o. GABTIN, or CLAREMONT, Nnw HAMPSHIRE, AssICNon. To SULLIVAN MA- CHINEaY COMPANY, A CORPORATION or MASSACHUSETTS Roon-DRILLINe MECHANISM Application med September 23, 1925. Serial` No. 58,172.

This invention relates to rock drilling mechanisms vand more particularly an improved drill steel coupling means for such a mechanism. l

Rockdrills of the mounted drifter type are especially adapted to use in drillingholes oi comparatively great depth. Such drills are usually mounted for movement in a guideway supported on a Clamp or a tripod in the usual manner and are provided with suitable feeding means for advancing the drill steel as the cutting bit deepens the hole. Cleansing fluid, preferably inthe form of a mixture of air and water, is usually admitted to the hollow drill steel by means of fluid conducting tubes extending through the drilling motor, and in certain instances pressure fluid is also taken from the motor cylinder to supplement this supply. When excessively deep holes are encountered it has been found that the amount of cleansing Huid supplied through these tubes and from the motor cylinder is inf.

sufficient to clear away the cuttings from the cutting bit, thus retarding the eiiiciency of the latter. In such deep hole drills when the drill reaches its forward feeding limit it is retracted from the work and the steel removed. A steel of longer length is then substituted and the feeding again resumed, this operation being re eated until a hole of the requisite depth .is o tained.

The primary object ofthe present invention is to provide improved coupling means for attaching and detaching sections of the drill rods. Another object of this invention is to provide a rock drill especiallyfadapted for drilling holes of relatively great depth and having improved hole cleansing means therefor. These and other objects will, however, subsequently more fully appear.

In the preferred embodiment this invention may comprise a rock drill of the hammer type preferably mounted in aguiding frame for movement relative thereto. The guiding frame may be supported on a column or triod in a usual manner. Adrill rod section 1s preferably carried by a rotatable chuck in the forward end of the drilling motor and this section preferably is provided with a rear shank portion which is supported in position' to receive the impact blows of the hammerpiston. The forward end of this drill rod section is preferably provided with a coupling of improved form for receiving and clamping a corresponding rod section in position. This improved coupling may be provided at the forward end of each adjacent drill rod section for permitting the attachment of additional sections as the cutting bit deepens the hole. Preferably arranged on the body of the drill rod section which is received in the motor chuck is a.swivel connection for cleansing fluid whereby a mixture of air and water under pressure maybe forced through the dri" rod to the drill bit to clear away the cuttings therefrom. More specifically the improved drill rod coupling` may comprise'a threaded clamping and steel locking member which engages a correspondingly threaded socket formed within the section of drill rod and this threaded clamping member is adapted-to engage the lugs of a cooperating drill rod section to clamp the latter rigidly in position against a detachable abutment within the socket. -In the modified form of structure the clamping means may comprise alaterally adjustable clamping element carried by one rod section and which engages the adjacent rod section.

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

In these drawings,-

Fig. 1 is aside elevation of a rock drilling mechanism incorporating one illustrative embodiment of theinvention, the view being partially broken away in central longitudinal vertical-section to facilitate illustration.

Fig. 2 is a vertical transverse section taken substantially `on line 2 2 of Fig. 1.

Fig. 3 is a longitudinal sectional view -taken substantially on line 3--3 of Fig. 2.

Fig. 4 is aV modified form of connecting means for the drill rod sections.

Fig. 5 is a vertical transverse sectional view taken substantially on line 5-5 of Fig. 4.

In the illustrative -embodiment of my invention shown in Figs. 1 to 3, inclusive, I have shown a rock drill of the drifter` type generally designated 1 which comprises a motor cylinder 2 within which a usual hammer piston is reciprocable. As illustrated; the hammer piston is provided w1th a forwardly projecting striking bar 3 having the usual straight and spiral flutes or grooves 4 formed on its outer periphery and these grooves are adapted to cooperate with a usual ratchet and pawl mechanism, generally designated 5 in a well known manner. The ratchet and'pawl mechanism 5 is adapted to transmlt intermittent rotary movement from the strlking bar 3 to a chuck 6 suitably carried within the forward end of the drill and this chuck receives a usual chuck bushing 7 within which is supported the solid shank 8 of a drill steel section 9. Suitably clutched as at 10 to the forward end of the chuck 6 is a usual steel locking and driving member 11 having lugs 12 formed thereon which are adapted to cooperate with lateral lugs 13 formed on. the

f shank portion of the drill steel section 9 in the usual manner.

From the foregoing description it will be evident that the hammer piston is adapted to impart a serles of 1 mpact blows to the shank of the drill section 9 and to rotate the latter intermittently. It will herein further be observed that the rock Hdrill 1 is slidablymounted in a usual guiding mechanism (not shown) in a well known manner. As shown the guideway 14 is provided with a suitable base 15 which is adapted to be clamped in position on a usual column or tripod.

In my improved construction it will herein be noted that the drill steel section 9 is provided with an enlarged cylindrical body portion 16 having a plurality of laterally extending longitudinally spaced passages 17 and a communicating longitudinal forwardly extending centralpassage 18 through which cleansing fluid may be supplied to the cutting bit as hereinafter described. In accordance with this invention the forward end of the body portion 16 is provided withv a further enlarged portion 19 having an internally threaded bore 20 and a'reduced bore 21 opening therein.' As shown disposed within the bore 21 is a hardened steel washer or button 22 having a central opening 23 extending longitudinally therethrough and communieating with the passage 18 in the body portion 16. It will herein be noted that the opening 23 is threaded in such manner as to receive a suitable tool for removing the button 22 from the bore 21. lAs illustrated, cooperating with vthe threaded bore 20 is a `clamping and locking member 24 externally threaded as at 25 and having laterally projecting lugs 26 which are adapted to be engaged by a. wrench or 'other suitable device for rotating the member 24. It will herein be noted that in this instance the clamping member 24 is provided at its forward end with an opening 27 of a shape corresponding to the same general contour of lateral lugs 28 which are formed on the shank portion 29 of a hollow rod section 30, the latter being provided with a. usual cutting bit 31. As shown, formed within the clamping member 24 is a suitable socket 32 and inwardly projecting lugs 33 the latter of which are ada ted to cooperate with the lateral lugs 28 ormed on erally designated 34. As this connection 34 is the invention of one Edward E. Miller and disclosed by him in Patent Number 1,704,053, granted March 5, 1929, detailed description of the same is deemed unnecessary except to state that a casing 35 is provided having at each end thereof adjustable uid tight stuifing boxes 36 and a lateral inlet connection 37 through which cleansing fluid, herein preferably a mixture of air and water, is adapted to be admitted and hence through the lateral passages 17 and communicating passage .18, the passage 23 in the button 22, and through the bore of the hollow drill steel section 30 to the cutting bit 31 toclear away the cuttin s therefrom.

n the use of the form of my invention shown in Figs. 1 to 3 it will herein be noted that lirst the rod section 9 is inserted in position within the forward end of the rock drill and turned and locked therein by the driver or locking member 11 in a well known manner. The shank 29 and lugs 28 of the rod section 30 are then inserted within the opening 27 in the clamping member 24 and-then laterally turned, thus locking the lugs of the drill steel in the socket 32 and preventing longitudinal displacement of the rod section therefrom. The clamping member 24 is then rotated by engaging the lateral lugs 26 formed thereon by a wrench or other suitable device, thus causing the same to press against 4the forward surface of the lugs 28 and resultantly forcing the rear surface of the shank 29 int`o A,tight engagement with the hardened steel button 22. The rod section 9 and the rod section 30 are then adapted to be rotated and percussively actuated as a unit, the stuffing boxes 36 of the swivel connection 34 .preventing leakage of cleansing fluid at that time as it flows through the rod sections to the drill bit. i

In the modified form -of myl invention shown in Figs. 4 and 5 the body portion 16 of the rod section 9 is provided with an enlarged portion 38 having an opening 39 at its forward end through which the shank 29 and the lugs 28 of the rod section 30 are adapted to be inserted. As' illustrated, formed within the forward end of the portion 38 is a socket 40 and inwardly project-l ing lugs, not shown, similar to the lugs 33 'in the member 24 heretofore described. The lugs 28 are likewise adapted to be turned and locked within the socket 40. As shown, formed in the enlarged portion 38 at the rear ofthe socket 40 is a bore 41 in the rear end of which is disposed a hardened steel button or washer y42 similar to the lbutton 2 2. Formed between the ends of the bore 41 is an enlarged bore 43 opening laterally as at 44 through the side of the portion 38. Disposed within the bore 43 is a cylindrical member 45 having a laterally projecting threaded por-- tion- 46 by whichy an adjustable nut 47 is carried. Engaging the side of the body portion 38 and closing the opening 44 is a member 48 with which the nut 47 cooperates.

In the use of this form of my invention after the drill section 30 has been inserted within the opening 40 in the enlarged por` tion 38 of the drill section 9 and locked therein by the lugs 28 the nut 47 engaging the threaded portion 446 is tightened causing the shank 29 of the section 30 to be rigidly clamped in position in the bore 41 with the rear surface thereof engaging the button 42, thus permitting the rod sections 9 and 30 to be percussively actuated and rotated by the hammer piston as a unit. In this form of my invention cleansing fluid likewise flows from the swivel connection 34 through the passage 18, the hollow button 42, and the hollow rod section 30 to the cutting bit 31 to cleanse the cuttings therefrom.

As a result of my invention it will be noted that an improved rock drill is provided especially adapted for drilling holes of relatively great depth and having improved means for coupling the drill rod sections together and for cleansing the drill hole. It will further be noted that improved drill steel coupling connections are provided which may be adapted to a rock drill of standard lform with a minimum of change and expense.

These and other advantages will be clearly apparent to those skilled in the art.

' While I have in this application specifically described two forms which my invention may assume in practice, it will be understood that these forms of the same are 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.

transmit rotation to the lugs of a drill steel,

said recess having a forward opening pro-- vided with slots having side walls out of alinement with the shoulders, and cooperat ing threads on said rod sections and member whereby rotation of said chuck-like member will effect a .rigid clamping of said steel and member to said rod section.

2. In an apparatus for supporting and rotating a hollow lugged drill steel, an axially ported member having an internally threaded socket with a recess at the inner end of said socket, a washer at the inner end of said socket positioned for engagement by the butt end of a drill steel, and a' cooperating member having in the forward end thereof a recess provided with shoulders to engage and What I claim as new and desire to secure by Letters Patent is:

1. Mechanism for supporting and rotatin a hollow lugged drill steel comprising a ro section having 'a longitudinal passage therethrough and a socket at the end thereof, a member Xed in the inner end of said socket positioned for engagement with the butt end

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