US405187A - Elmer a - Google Patents

Description

(No Model.)V

E. A. SPBRRY. ELECTRIC DEILLINC MACHINE.

N4 PETERS. Pmfumugmphmwnhingxm u. c.

UNITED STATES PATENT OFFICE.,

ELMER A. SPERRY, OE CHICAGO, ILLINOIS, ASSIGNOR TO THE SPERRY ELECTRIC MINING MACHINE COMPANY, OF SAME PLACE.

ELECTRIC DRlLLlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 405,187, dated June 11, 1.889.

Application led April l, 1889. Serial No. 305,584. (No model.)

To all whom t may concern,.- v

Be it known that I, ELMER A. SPERRY, a

I citizen of the United States, residing at Chiconvenient means for drilling, and particularly for electrical drills or machines for drilling minerals and the like. This object I accomplish by means of the mechanism illustrated in the accompanying drawings, where- Figure l is a cross-section through the body of the device. Eig. 2 is a rear view of a portion thereof with parts removed. Fig. 3 is a detail of the drill-rotating slot; and Fig. 4- is a cross-section on the line Z Z, showing the drill-rotating mechanism.

Like parts are indicated by the saine letters in all the figures.

K is the field-magnet; K, the armature; K2, a controlling balance-wheel on the shaft thereof g K3, the brushes; K, arms on the frame to which the armature-shaft is journaled above; K5, the rear cross-piece of the frame, through which the shaft K6 of the armature passes for a guide.

K7 is the base of the frame which supports the drill-driving mechanism, and in this frame is placed a foot-block KS, upon which rests the lower end of the shaft K6. The shaft KG carries two pinions L L2, which respectively mesh with the gears L3 and L4. These gears are journaled, respectively, in the upper portion of the frame L5 and the lower portion K7 and are connected with the crank-plates M M in any desired and practical way, though preferably by a clutch mechanism such as that illustrated elsewhere in another case of even date herewith,-Serial No. 305,585.

M is a crank-pin having the collar M2 thereabout and encircled by the straps M3, which are connected by the cross-bar M4, secured in place by the key M5 and passing through the slot M6 in the piece M7, which lies between the two sides of the straps M3.

N is a transverse pin in the pitman-head N', and it is encircled by a collar N2, and this collar by a strap N3, the ends of which are secured to the piece M7 by the transverse pin N4, all of which is more fully illustrated elsewhere in another application of even date herewith, Serial No. 305,585.

O is the forward part of the frame, cylindrical in cross-section and having the projecting' cup-shaped end O, in which is secured and from which projects the cylinder In this cylinder is a reciprocating tube O4, having at its outer extremity the flange O5 and surrounded by a spring 0"', which bears at one end against the inner end of the cupshaped portion O and at its other end against the flange O5.

O17 is the drill-rod, flanged and enlarged at O7 and provided with the clamp O8, to which is secured the drill-point O9. On the inner end of this drill-rod O17, and rigid therewith, is the ratchet-wheel O10, held Ain position by the spring-dog O11, pivoted on the pitmanhead N This pitman-head is slotted at O12. Concentric with the ratchet-wheel is the arm O13, having the spring-dog O14, which engages such ratchet-wheel, and the projecting end O15, which passes into the slot O1G in the interior of the surface O.

All of the parts so far described are 4supported on the frame, which is provided with the side ledges P P, whereby the entire frame and all of the parts so far described are supported on the ribs P P,which are supported on the side parts P2 P2 of the main supporting-frame. These said parts come together below inf the supporting portion P3, through which passes the shaft P4, on which the entire machine is supported in any desired position and upon any suitable carriage. The cylinder O is slotted at R, and the head N has a lip R projecting through such slot. Projecting from the framepieces P2 P2 are the rods R2 R2, provided at their outer extremities with the cross-bar R3, in which is journaled the screw-rod R4, having the crank R5 at its outer end. This crank can be locked to prevent its rotation by the link R6. This screw-rod R4 passes through the lugs R7 RT, secured to the bottom of the IOO frame-plate K7, and between these lugs and screw-threaded on such rod is the screw threaded ratchet-wheel RS.

R9 is a pivoted bellcrank lever, having at one end the pawl R11J to engage such ratchetwheel, and at the other the rod R11, with the coupling R12 and the end piece R1i".

R11 is a standard on the frame, and R15 is a spiral spring from such standard to the end R3 of the rod.

R16 is a latch on the lug R1, adapted to engage the end R1T of the pawl R1, and thus lock it slightly beyond Ithe limit of its normal motion.

S S are the conductors which supply the current to the motor.

S2 is a switch, and S a cord leading from the handle thereof.

S1 is a pulley, over which such cord passes, and S5 is a lug on the cross-bar R, to which the cord Si is connected.

S is the screwpillar, on which the shaft P1 is secured, and bywhieh the entire machine is supported.

R18 is a lock-pin for the nut R8.

The use and operation of my invention are as follows: rihe operation of the motor and the elastically-connected pitman and the d riving mechanism therefor has been sufficiently described elsewhere in another application of even date herewith, Serial No. 305,535, and is not specially claimed here. The operation of the motor rotates its shaft l, and hence Arotates the gears LfE and L1, and thus moves the crank-pin M. This retracts the pitman, which is elastically extensible, and which is connected at one end with the crankpin lll', and at the other with the pitman-head pin N. ln this device the pitman-head is cylindrical and reciprocates. As the machine is operated the pitman is retracted, carrying with it the pitman-head and all the connected parts and compressing the spring O, W'hen, by the operation of the release and clutch mechanism which connects the gears L3 and L* with the crankplates M M, the drill and pit-man-head are released, the spring OU expands and forces the drill forward. As this action takes place, the end O15 of the arm O13, projecting` into the slot O1, causes such arm to be carried about its center as it moves longitudinally along the cylinder O, and its spring dog O11, engaging the ratchet wheel O111 rigid on the drill rod O11, causes the same to rotate, and thus the drill to be partly rotated before its next stroke is given. The head N reciproeates but does not rotate within the cylinder O. The cylinder O is fixed, and the drill-rod O11, with its drill at one end and its ratchet-wheel O11) at the other, rotates as the work progresses. As suming that the latch R1G engages the end R1T of the dog R111, so as to throw the rod R11 in its extreme forward position,wliere the end R13 will never be engaged by the lip R in the stroke, the screw-rod free to be operated by the crank Rf', and when so operated, such screw-red being fixed in its relation to the frame-pieces P2 l, by reason of its being j ournaled so as not to reciprocate in the cross-bar R, whichA is supported by the rods R2 R2, will cause the entire upper portion of the frame which is supported on the ribs PP to reciprecate or move forward to the work when desired, the nut R8 being during this operation locked by the pin R111. Vhen it is not desired that this should be done by hand, as in the case of several machines being operated by a single workman, the crank is locked by a link RG, so as not to be capable of revolving. In this case it is apparent that the rotation of the ratchet-wheel or nut RS between the lugs RT R`7 will cause the upper frame carrying the operating' mechanism to move forward along the ribs P P. New, in order that this feed may be automatically accomplished bythe machine and that the feed maybe proportional to the work, l employ the autoinatic feed mechanism consisting` of the dog R111, elbow-crank lever R1, rod R11, havingthe end R, which projects into the path of the lip R, and the retracting-spring R15. These parts are shown in the position at the end of the stroke, the crank locked and the rod having just been engaged so as to bring the operating mechanism forward. As soon now as the head N retreats the spiral spring R15 will retract the rod R11 and end R13 and turn the elbow-crank lever on its pivot and brin the dog R1" into engagement with a lower tooth of the ratchet-wheel RS. l5 y the expansion of the spring and the operation of the machine the pitman-head N rushes forward, the lip R will engage the end R13, force it and the rod R11 forward, raise the dog R111, and cause the ratchet wheel or nut Rs to move on the serewrod against thelug R7, and will thus move the operative parts forward to the work. lf the blow is delivered to the work before the lip R has engaged the projection R3, the meehanism will not feed until the drill by its operation has proceeded far enough into the work to cause the lip and projection to engage, when it will again feed, and hence the feeding is not only automatic, but nicely proportioned to the progress of the drill. Then the operative parts have reached the limit of their forward motion, further progress on their part will draw upon the cord (Y, open the switch, and stop the machine.

lf the velocities of the drill are traced from one dead-center to the other of the crank, it will be noticed that the velocity up to thc center is gradually increasing, whereas from the middle of the stroke to the other deadcenter itis gradually decreasing, which, taken in connection with the ratio and momentum of the interior rotating drill, will develop the additional fact that their friction is least in the center of the stroke, at which time therotation should take place. The slot O1 has its curvature in the center and is straight at its IOO IIO

extremities. The cylindrical portion O, in which reciprocates the cross-head M', serves as an air-cushion for such cross-head.

The hand-feed may be used in conjunction with the automatic feed to increase the rapidity of operation of the machine, and both may be used together. The cam-groove OIG and arm O13, together with the pawls and ratchet connected with the drill-rod, co-operate together to rotate the drill, and hence are collectively called the rotaton The feature of this rotator is its faculty of operating only in the middle of thc retraction of the drill, that being the portion of the drills excursion at which the friction of the parts is least. Of course other forms of rotators to accomplish the same result might easily be devised, and hence I do not Wish to limit myself to the particular form of rotator used; but I use the term broadly.

The controlling-switch may obviously be of any desired kind, circuit connection, or location, the essential feature being that it shall be controlled in its application so as to affect the motor responsively to the variations in the relative positions of the fixed and movable frames incident to the excursion of the latter.

I claimi. In a drilling-machine, the combination of a reciprocating drill with a rotator operating upon said drill in the middle of its retraction only.

2. In a drilling-machine, the combination of a reciprocating drill and a driving-crank therefor, and a rotator for such drill operating only in the middle of the retraction of such drill.

3. In a mining-machine, the combination of a reciprocating drill, driving-crank therefor, and a rotator containing a pin and a cam, the latter so shaped as only to operate upon the drill in the middle of its retraction.

4. In a drilling-machine, the combination of a drill-rod with an inclosing-sleeve, a driving-spring about the same, and a guide-cylinder inclosing the Whole with suitable endbearing surfaces for said spring', so that the driving-spring is inclosed and supported internally and externally.

5. In a drilling-machine, the combination of a fixed frame with a frame movable thereon, a drill, an electric motor therefor supported on said movable frame, a switch to control such motor, said switch connected with such frames so as to affect the operation of the motor at any predetermined point in the excursion of the moving frame.

G. In a drilling-machine, the combination of a fixed frame with a frame movable thereon, a drill, an electric motor therefor on said movable frame, and a switch to control such motor, said switch secured on one frame and its handle connected With the other frame, so that it is operated to affect the motor responsive to the variations in the relative positions of the two frames.

7. In a diillingmachine, the combination of a fixed frame, a movable frame supported thereon and carrying the operative parts, a screw-rod connecting the tvvo frames, a crank thereon, a movable nut on such screw-rod, and a ratchet and dog, said dog connected with the drill, so that the movement of the latter causes the rotation of such nut to move the operative part on such fixed frame.

8. In a drilling-machine, the combination of the fixed frame, a movable frame supported thereon and carrying the operative parts, a screw-rod connecting the two frames, a movable nut on said screw-rod, and a ratchet and dog, said dog connected with the drill, so that the movement of the latter causes the rotation of such nut to move the operative parts on the iixed frame.

9. In a drillingmachine, the combination of a fixed frame, a movable frame supported thereon and carrying` the operative parts, a screw-rod connecting the two frames, a crank thereon, a locking device for said crank, a movable nut on such screw-rod, and aratchet and dog, said dog connected With the drill,`so that the movement of the latter causes the rotation of such nut to move the operative parts on the fixed frame.

lO. In a drilling-machine, the combination of a fixed frame, a movable frame supported thereon and carrying the operative parts, a screw-rod connecting the two frames and a crank thereon, a locking device for said crank, a movable nut on said screw-rod, a locking device for said nut, and a ratchet and dog, said dog, connected with the drill, so that the movement of the latter causes the rotation of such nut to move the operative parts on the fixed frame.

li. In a drilling-machine, thc combination of a fixed frame with a moving` frame sup- IOO ported thereon and carrying the operative parts, a screw-rod connecting the same, a nut and ratchet-wheel thereon, a dog to operate such ratchet-wheel, and a latch to hold such dog out of operative position.

Signed this 30th day of March, i889.

ELMER A. SPERRY. In presence of FRANoIs W. PARKER, CELESTE P. CHAPMAN.

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