US1703843A - Drilling mechanism - Google Patents

Description

Feb. 2 6, 1929.

E. G. GARTIN DRILLING MECHANISM Filed Dec. 2l. 1922 Patented Feb. 26, 1929.

Erima G. eAR'rIN.k or CLAREMONT, NEW' 'HAMrsirIRn As'sIGNoR "ro sULLrvAN PATENT 'fogFF lcE-.

MACHINERY COMPANY, A CoRP'oBA'rioN vor MASSACHUSETTS.

` DRILLING MECHANISM.

i Application led December 21, 1922. .Serial No. 608,307. .A

tion of the drill steel. Other objects and advantages of my invention willhereinafter more fully appear. Y

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

.In these drawings,-. p

Fig. 1. isa central `longitudinal section through the illustrative embodiment of my invention. Y Y y Fig. 2 is a transverse sectional view taken on line 2-,-2 of Fig. 1. f

My invention has been shown forpurposes of illustration embodied in apercussive drilling apparatus which is generally designated 1 and which includes a cylinder member 2 in whose bore 3 a ypiston 4 is reciprocable, this piston beingadaptedto be reciprocated by fluid pressurel admitted thereto through inlet ports 5 and 6 and distributed by a groove 7 formed in the piston to passages 8 and 9 opening into the bore of the cylinder at appropriate places. It will be noted that the Y passage 9 opens into the borepof the cylinder at -the extreme end of the latter aswell as at other suitable and usual points, the rearmost point of' communication being designated 10.l `The piston 4 is herein also proerate with a portion v16 of the chuck mechanis'm sothat rotation of the steel is impossible except asvthe chuckis rotated. Y

In my improved construction, the cylinder Amember 2 is provided With' a rear head 18 through which a passage 19 opens, this passage communicating with a cylinder Lbore or chamber 20 formed in a member 21 arranged at the rear end of the cylinder member 2. The opposite end of the chamber 20 is closed by a head 22 through which an opening 23 is formed and through this opening a short 'piston rod 24 formed on a piston 25 reciprocable in the chamber or cylinder 20 is movable. A spline and key connection, asindicatedat 26, prevents rotation of the piston 25 as the latter'r is reciprocated. The piston rod 24 is likewiseprovided with one or morespiral grooves 27with which spiral keys 27 formed on a pawl carrying member 28 are'l arranged to cooperate.Y Thepawls on said pawl carryF ing vmember are adapted `to engage, as in any usual and well known construction, internal teeth 29 on a gear 30 which is rotatable ina chamber31 to the rear of the cylinder 20. The gear meshes with a smaller gearv 32 which is mounted u pon a tubular shaft 32',

Ywhich is engaged by a dent-al clutch 33 with a second tubular-shaft 34. This last shaft carries at' its front end a pinion 35 which l41 in the piston rod -24 and the recess 40 receiving theannular piston rod 24. A vent 42 permits .the free movement of the piston rod in the vrecess 40. Air is adapted 'to be constantlysupplied during drilling through the [passa-ge 45V and around the outside of the cleansing fluid supply tube 46, which last is supported in the end member 38. It will thus Lbe evident that the pressure fluid lsupplied throughrthe passage 45 and around the tube 46 exerts a constant pressure tending to force v the piston 25 toward theright, or forwardly. vided with a nose or striking member 12 A which passes throughan opening 13 in the It will, moreover, be evident that, each time g that admission occurs to the rear end of the .cylinder 3 therewill be admissionY throu h the port 19 to the cylinder 2O at the rig t hand side'of the piston 25 in such manner that .meshes with a gear 36-formed on. a chuck 1 :rotating sleeve 37. A rear head member 38 this piston vwill move toward the left due to the action of' the-air upon the greater area of the end ofthe piston 25. It will be noted that the vent 42 likewise .vents the space to the left of the piston 25 in the chamber 20 by way vof. the straight and spiral grooves termed in the piston 'rod 24. Itwill be. observed that Vsuitable side rods 47 and 48,v the latter of` Y which forms a bearingfor the tubular shafts 32 and 34, maintain the parts of the drill in assembled relation. i Y

From the foregoing description the inode of operation of this mechanism will be clearly apparent. Air having been admitted to the i from the Vright hand endV of the cylinder and accordingly the piston will be alternately moved yin opposite directions by the air admitted through the port 19 and by the constant air pressure act-ing in the chamber '41. j As the piston 25 reciprocates, the spiral grooves will also os'cillate the pawl carrying member 28 and this, as it oscillates, will cause progressive rotation ofthe gear 30', Vwhich will in turn drive the lpinion 31 and so, vthrough'the shafts 32 and 34, the pinion 35, andthe pinion 36 will drive the chuckvcarrying member 37' and so cause rotation of the drill steel.

that'I have produced a very compact-and ef7 ficient construction.

Y While I have in this application specifically described `one form which my invention may assume in practice, it will be understood that this form of the same is'shown for purposes of illustration and that the invention may be modified and embodied in other forms Without departing from its spirit or the scope of the appended claims. Y v

What I claim as new and desire'to secure by Letters Patent is: Y j

1.V In a rock drilling mechanism, a percusysive motor to actuate a drill steel, and drill steel rotation mechanism including a cylinder having a piston reciprocable therein and disposed yat the rear end of said percussive4 motor, a common head for said cylinder and motor, a

`motive Huid conducting passage in said head allowing constant communication between the adjacent ends of said cylinder and motor, and

means for controlling the reciprocation of said piston by said percussive motor.

2.- In a rock drilling mechanism,a percus sive motor, a steel chuck carried at 'the front end thereof and a steel rotation motor carried at the rear end thereof comprising'a piston and cylinder, said pistonV having a tail rod,

rotation mechanism associated with said tail rod for rotation thereby and including a rotate1 able side'rod and afplurality of meshing gears one of which is attached to said side rod, and

ldriving connections between said side rod and said chuck.

3. Ina drilling mechanism, ay percussive motor, a'steel chuck, a rotation motor therefor comprising a cylinder, and piston therein,

at-ail rod carried by said piston, a rear head It will thus be seen that I-have y Vvprovided coaxial percussive and drill rotat-V ing motors bothvof the reciprocatory type and carried by saidcylinder through which said tail-rod and including a pawl an-d ratchet mechanism Adisposed adjacent said head and a vshaft disposedV substantially lparallel to said percussive motor. j

' 4. In a rock drilling mechanism, a cylinder and piston, said piston having a reduced hollow extension, a member telescopingwith the hollow portion thereof, means for subjecting said hollow portion to constant live pressure fluid during all movements of said piston and to vent'oonstantly the end of the cylinder in whichV said extension is disposed, and means for intermittently subjecting the other. end of the cylinder to'live pressure fluid to cause reciprocation of said piston.

5. In a rock drilling mechanism, a drilling iiiotorhaving a casing providing a cylinder bore, a piston therein, a drill steel actuated by said motor, a vdrill steel rotation motor having a separate cylinder with a reciprocable piston therein, means for subjecting a portion `offoneV end of said latter piston to constant thereof, and to simultaneously Vvent the adj acent en-d of the rotation motor cylinder, and means for intermittently subjecting the other end of said rotation motorpiston to live presing and alined witlithe longitudinal center thereof, said piston having Ymeans cooperating' with and extending through said intermediate head member, ratchet andA pawl mechanism disposed in said rear head element and with which said piston cooperates,'and operative connections between said ratchet andV pawl mechanism and said Vchuck for rotating the latter. Y Y

7. In a; drilling mechanism, a drilling motor including a cylinder and piston and a rotatable drill steel receiving chuck, rotation rmeans for said cliiickcoinprising a recipro- ,cable .pistonv arranged coaxially with said live pressure fluid during all movements llO motor, aratchet and pawl mechanism operated by said last-mentioned pist-on, a gear concentric with said ratchet and pawl mechanism andV actuated thereby, a :cooperating gear meshing therewith, and transmission means between said latter gear and said chuckin- `cluding a transmission shaft disposed parallel with the longitudinal axis Vof said drilling motor. Y

8. Ina rock drilling mechanism, a percussive motor having a relatively stationary cylinder, a piston reciprocating in said cylinder in contact with the walls thereof and fluid distribution means for regulating the passage of a working fluid through t-he motor to effect reciprocation of said piston, a` drill steel percussively actuated by said motor, means for rotating said drill steel comprising a cylinder and piston motor having its axis alined with the axis of said percussive motor and arranged at the rear end thereof, and opera-- tive driving connections between said motor and the drill steel including a rotating element extending longitudinally of themachine, said fluid distribution means for said percussive motor also controlling said rotation motor;

9. In a rock drilling mechanism, a percussive motor having a relatively stationary cylinder and a reciprocable piston fitting in the bore thereof, a drill steel percussively actuated by said motor, a second motor arranged at the rear end of said percussive motor and having a cylinder coaxial with said first cylinder, a piston reciprocable therein having an area subjected to constant pressure and an op osed area in communication with one end o the cylinder of said percussive motor, and operative drivino connections between said second piston and the drill steel for rotion of said gear to said drill steel.

11. In a rock drilling mechanism, a percussive motor having a relatively stationary cylinder and a reciprocable piston fitting in the bore thereof, a. drill steel percussively actuated by said motor, a second reciprocating motor having a cylinder coaxial with said percussive motor cylinder, a piston reciprocable therein, a common cylinder head between said cylinder and an aperture therethrough for establishing direct communication between the same, and mechanismfor transforming reciprocating movement of said second piston to rotary movement and for transmitting said rotary movement to. the drill steel.

In testimony whereof I affix my signature.

ELMER G. GARTIN.

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