US397311A - Drilling-machine - Google Patents

Description

(No Model.)

PSGHOFP.

DRILLING MACHINE.

ffwnol' redem Schw N-iTn STATES PATENT Grricn.

FREDERIC SCI-IOFF, OF PHILADELPHIA, PEIINSYLANIA.`

DRlLLlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 397,311, dated February 5, 1889.`

Application tiled October 27, 1888.` Serial No. 289,277.' (No model.)

To @ZZ whom t may concern:

Be it known that I, FREDERIC ScHoFF, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Drilling-liachines, of which the following is a specification.

The object ot my invention is to construct a simple and handy drilliiig-machine for boring or tapping the set-screw holes and oilholes in pulleys.

The machine which I will now proceed to describe is to be used as a portable drillingmachine in connection with a flexible drivin gsha'ft; but it will be evident that the machine canV be either permanent or portable, and driven by belting in the usual manner.

In the accompanying .lrawings, Figure l is a perspective view ot my improved drillingmachinc. Fig. 2 is a vertical seelion.- Fig. 3 is a transverse section on the line l 2, Fig. 2; and Fig. l is a sect-ion on the line 3 l, Fig. 2.

A is a standard or l'rame having a sleeve, d, which is adapted to pass over a hollow mandrel, Il. In this mandrel is a screw, C, and adapted to the threads of the screw is a nut, E, this nut beingV secured to the collar d ol' the standard A by a nut, e, adapted to the threaded portion e ol' the nut. The screw C is journaled in the inner end of the mandrel B and at the outer end in a cap, B', screwed upon the mandrel, the cap being conlined to the screw by a fixed collar, c, and a movable collar, c. The screw-shaft is provided with a suitable handle, C', by which the screw is turned and the standard A moved upon the mandrel.

Forming part of the mandrel Bin the present instance is a screw-threaded stem, b, adapted to the threads on which is a thumbnut, b. On this stem b is a flange, f, a collar, f, and a con e, f2. The collarf, I make of the same diameter as that of the bore ot the pulley, and I slip the pulley into position, as shown by dotted lines in Fig. 2, then the cone, and then screw up the thumb-screw b until the pulley is iirmly held in position upony the stem if; but it will be noticed that a space is left between the sleeve f and the cone f2, so that the drill or tap, described hereinafter, can pass through the hub of the pulley and malte a clean hole without inj uring any Aportion of the machine or the drill or taps.

On the standard A slides a carriage, D, carrying the drilling mechanism, said carriage being adapted to undercut ways d in thestandard A. Portions d of this carriage bear against the sides of the standard A, so as to insure perfect steadiness in the travel of the carriage. The carriage is raised and lowered by means ot' a screw, G, journaled in the standard A and provided at its upper end with a handle, G.

Adapted to the threads ot the screw G is a nut, H, which passes through a slot, h, Fig. 2, in the rear of the standard A, and .into a T- wayin the carriage D, the shank 71Fig. at, of the nut being T-headed to correspond with this way. A set-screw, h2, bears against the shank ol. the nut, preventing its moving independent ol' the carriage; but when it is desired to release the carriage from the control ot' the nut the set-screw is turned out of engagement with the shank 71. of the nut.

The vertical screw-shaft feeds the carriage radially toward and 'from the hub of the pulley, so that by turning the screw-shaft C in one direction the drill will be' moved toward the pulley, and by turning the screw-shaft G the drill will be fed radially toward the hub ot' the pulley.

The gearing tor driving the drill is constructed in the following manner: The driv-` ing-spindle L has its bearings in the extension Z on the carriage D, and to this spindle is attached the flexible driving-shaft, or, where driving-shafts are not used, a pulley may be secured to this spindle. On the inner end of the spindle is a bevel gear-wheel, 2, as shown in Fig. 4, engaging with a bevel gear-wheel, 3, on a vertical spindle, 4., having its bearings in the upper and lower casing of the carriage. On the vertical shaft -i is a pinion, 5, engaging with a pinion, G, this pinion in turn engaging with a pinion, 7, and the pinion 7 engaging with a pinion, S. viall these pinions have their bearings in the upper and lower frames of the carriage. The lower frame in this instance is detachable, so that on removing said lower frame all the gearing can be removed for repairs. The orice in the pinion 8, I prefer to make tapered, so as to fit the IOO shank of the ordinary twist-drill, which is shown in position on said pinion. Thus it willbe seen that this portable pulley-hubdrilling machine can be applied to a pulley in any position on the bench or ioor, depending' upon its size, and can be attached to said pulley very quickly and be in position to bore the necessary set-screw holes or oilholes, as the ease may be, without the necessity ot' the tedious oi'ieratiou of securing' The pulley in a certain position, boring; not only through theI hub olf the pulley, but also, in most eases, through the rim of thewhccl, thus wealtcninI it to a certain degree.

The machine will take in a number oli' sizes of pulleys, and by the lsimple adjustment of the two screw-shafts C and G, l `ani enabled to accommodale the mach inc todif'l'erent sizes oli' pulleys. y

A suitable tapping-tool is provided, and when ,itis required to tap the orifice after drilling' l uncouple the carriage from the nut H by unscrewing' the set-screw 712, so that: it will. be free from the feed-screw G, and when the tap is started it feeds itself into the orifice, and by uncoupling' the'f'lexible shaft (shown by dotted lines in Fig. l) the tap can be reversed by hand by applying' a suitable handle or wrench to the end of. the driving-shaft L.

The eonej"J is adapted to fit into the bore of a number of ditt'erent-sized pulleys; but the sleeve or collarf, I prefer to make to fit the diiierent sizes, so as to have a iirnl bearing,I as nearly as possible under the drill. Theilange fta-kes the thrust of the pulley, and, beil'lg'accurately made, will insure the drilling' of the hole in the proper line.

I claim my inventionp Il. The combi n ati on, in a pulleyhuli-drilling machine, of the mandrel B, adapted to be secured to thehub of the pulley, and a screw-shaft Vin said maniflrcl, with a standard, A, carrying` the drillscarriag'e, and a nut detachably sccured to said stainlard and meshing` with the threads on. the screw, substantially as described.

The (ombination ot' the mandrel carrying the drillinfr mechanism, havingl a screw-spindle, Z), and a nut thereon, lwith a cone-sleeve on said spindle and acting' with the mandrel to clam p the hul) ol' the pulley to the frame, substantiall y as described.

1'). The combination ot' the mandrel l-, the screw-shaft (l, sliding' standard A, havingl a nut engaging' with the screw-shaft (f, said standard having' guideways, and a carriage aijlapteil to said guideways and provided with a nut, with a Vertical screw-sllait/in said stand ard engagingl with the nut, so that by turi'ling the shafts C and G the carriage may be moved both from or toward the pulley and from or toward the cent-e1' of the pulley, substantially as described.

4. The combination, Vin a drilling' and tapn pingx machine, of the standard havin g a screw, an d a nui'I adapted to th e screw, with a dri ll-carriage adapted to be raised or lowered by said screw, and means for securing the carriage to and detaching,r it from the nut without disturbing either lthe nut or the carriage, substantiall y as set forth.

The combination olf the standard A,scre\v shaft G, and a nut, Il, adapted to said screw, with a carriage, D, having, a T-slot in which the shank o'l' the nut l'I is confined, substantially as described.

In testimony whereof I have signed myname to this specication in the presence ol" two subscribing' witnesses.

YVitnesses:

HENRY HowsoN, WILLIAM I), (JONNER.

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