US287366A - Office - Google Patents

Description

(No Model.)

T. J. a P. T. CURRIBR.

DRILLING MACHINE. No. 287,366. Patented 001;. 23, 1883.

v4 mi? i III TiMo'THY J. CURRIER AND FRANK DRILLING- 'i .Nini-:n STATESv T. comme, or WORCESTER, MASS.

MACHINE.

SPECIFICATION forming part of Letters Patent No. 287,366, dated October 23, 1883,

Application filed December 16, 1882. Y(Xo model.) I

To all whom it may concern Be it known that we, TIMOTHY J. CURRIER and FRANK T. CURRIER, citizens of the United States, residing at Vorcester, in the county of IVorcester and State of Massachusetts, have invented a new and useful Improvement in Drilling-Machines, the nature and objects of which are fully set forth in the following specification, reference being had-.to the accompanying drawings, which illustrate our invention, and in whichl Figure l represents a side elevation of our improved drilling-machine; Fig. 2, a side elevation of aportion, showing the feeding77 device; Fig. 3, a front elevation of the same; Fig. 4, an interior view of the clutch; Fig. 5, a sectional view of the same; Fig. 6, a sectional View of the post online x x,- Fig. 7, a

top view yof the sliding head; and Fig. 8 repupon the table @,which is capable of the usual adjustments common in drilling machines. Theodrill-spindleB rotates in the two supporting-heads D and E, the head D being fixed to the post B and carrying the' gear-wheel A5, through which the drill-spindle B slides, a

spline and groove causing a rotary motion of the spindle. The headE slides upon ways on the face of the,post B, held by the gibs g g. The vertical sliding motion of the head E is imparted to the drill-spindle by means of the collars a a, attached to the spindle B. A vertical feeding motion is given to the sliding head E by means of the pinion F, on the shaft F', rotating in the rack F2, xed to the post B. The pinion F is driven by the Ihand-wheel G on the short transverse shaft G,which carries the endless screw or worm G2, driving the worm-wheel G3, which actuates the shaft F by the four pawls b b b b, engaging the ratchetwheel II, xed to the' shaft F, one pair of the pawls driving the .ratchet-wheel in one direction and the other pair in the opposite direction. The shaft F has a slidingy sleeve, I, having handles c c and a pin, d, which passes through a slot', e, in the shaft F,and by which allowing aquick return motion7 vto be given to the drill-spindle and head E. In order to operate the pinion F by means of the handles from the ratchet H, which is effected asfollows: Each of the pawls has'a short arm, f, Figs. 4 and 5, projecting forward at right augles to .and from the free end of the pawl,and the sliding sleeve I carries at its inner enda conical ring, I, whose beveled surface, sliding under the arms f, raise the pawls b, and thereby disengage the worm-gear G3, permitting the shaft F to be operated by the handles c c.

Upon the transverse shaft G we place the worm-gear J, attached to the shaft G by any suitable clutching device by which it may be connected to or disconnected from the Shaft G at will. This gear J is driven by the worm J on shaft J 2,' which latter is held in suitable bearings attached to the sliding head E, and having a sliding motion throughthe bevelgear K as the head E is moved up or down.

the bevel-gear K, (by means of a spline and groove,) the bevel-gear K', shaft L, and pulley L2, driven by the pulley L3 .on the main shaft A?. The pulley L runs loose on the shaft A3, beside the druml M, fixed to the shaft. A cam, N, having a handle, N', turning on theshaft and pressing against the camsurface on the box N2, serves to slide the pulley L:i onto the drum M, as shown in Fig. 8, forming a friction-clutch, and thereby applying power to pulley L3 and the feeding mechanism'. When the pulley is released by the cam N, the spring N3 separatesthe drum and pulley, thus disconnecting the feeding mechanism from the driving-shaft A3.

In the operation of .drilling the pressure upon the drill-spindle is upward, causing an undue strain upon the gibs g g. To obviate this, we make a groove, P,.in the face. of the post and attach a tongue, P', to the sliding l head E, causing it'to project upward for some distance, as at P2, Fig. 3. This tongue, as the the shaft may be rotated by the handles c c,

Power is imparted to the sliding shaft J 2V by Y c c, the pawls b b b b 'must first be disengaged IOO head E moves up or down, slides in the groove P, resting against ,the bottom of the groove, the part P passing underI the head D. By this construction we get a much greater length of bearing-surface to resist the vertical pressure against the drill. Ve have shown the groove P in rectangular section, but we do not confine ourselves to this form. It can be made with beveled sides and the tongue P dovetailed into the groove, so as to secure the head to the post and render the use of the outside gibs, g g, unnecessary.

IVe are aware that drilling-machines have been heretofore made having heads capable of sliding on the post, for the purpose of 'adjusting the position of the drill with reference to -the work; but in the operation ofdrilling the head is fastened to the-post, and the feeding motion given to the drill-spindle by means of a slide passing through the head E, and

within which the drill rotates. This mode of feeding vthe drill has-two obvious disadvantages, viz: As the head E remains stationary and the drillspindle advances downward, the distance between the point of the drill and the support in the head E is constantly changing, and in holes of considerable depth the strain at the point of the 'drill is brought `at too great a distance from the head; again, the bearing of the drill-spindle in the slide is subject to wear, which soon interferes with the accuracy of the work; but by our improved mode of feeding the sliding head E we maintain the same distance between the point of the drill and the head E, and we are able to inclose the drill-spindle in an ordinary box, by which any lost motion may be taken up,

and this result is accomplished by making the rack F2 stationary and fixed to the post, and attaching the feeding mechanism to the sliding head E. We are also able to readily connect our feeding mechanism with the power used to drive the drill, and that without stopping the drill byl connecting the worm gear J to the transverse shaft G', and the friction clutch-pulley' L3 to the shaft A3.

' Vhat we claim as our-invention, and desire to secure by Letters Patent, is*

1. In a drilling-machine, the combination,v

with a post having a fixed head and a drill- 'spindle sliding through the fixed head, of a sliding head carrying the drill-spindle and sliding on ways on the post, and suitable mechanism for imparting a feeding motion to 5 5A the sliding head on 'the post during the opera- -tion of drilling, as and for the purpose set forth.

2. n1 a (inning-machine, the combination of post B', fixed head D, sliding drill-spindle B, sliding head E, carrying the drill-spindle and sliding on ways on the post B', Witha fixed rack attached to the post, and rotating pinion journaled on the sliding head and engaging the fixed rack, with means for rotating the.

pinion, whereby a feeding motion may be parted to the sliding head andconnected drillspindle, as and for the. purpose set forth.

3. In a drilling-machine, the combination,

with the drill-spindle B and sliding head E, sliding on ways on the post and carrying the drill-spindle, of the pinion F, shaft F', fixed rack F2, worm-gear G3, attached to the shaft F' by a clutch, so as to be disconnected at will,

the worm G2, and shaft G', with connected mechanism for rotating the shaft- G', as and for the purpose set forth.

et. The combination, with the drill-spindle beveled ring, with its connected sleeve sliding upon but capable of turning the shaft F', and having the handles c c, as and for the purpose set forth.

6. rPhe co1nbination,'with the driving-shaft A3 and the connected feeding mechanism coni- B and sliding head E, of the hand-wheel G, v

prehending the rotating pinion F, journaled on the sliding head E, and a fixed rack on the post B', as described, of a clutching device on the shaft A, whereby the feeding mechanism may be disconnected from the driving-shaft, as and for the purpose set forth.

7 In a drilling-machine, the combination, with the sliding head, as described, of atongue sliding in a groove formed in the post and extending upward beyond the head E, so as to increase the length of the bearing-surface and serve to resist the pressure against the drill in the operation of drilling, as and for the purpose set forth. f

TIMOTHY J. onnninn.

FRANK T. oUnninR.

Viinesses:

DAVID MANNING, J r., P. N. BLACKMER.

IOO

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