US235948A - cheever - Google Patents

Description

(No Model.) 2Sheets-Sheet 1.

" A. GMHOLG'OMBE & O. A. GHEEVER.

Electrical Rock Drill. -No. 235,948. Patented Dem-28,1880.

J71 var: Z1775.

(No Model.) 2 Sheets-Sheet 2. A. G. HOLOOMBE &,G. -A. GHEEVER.

Electrical Rock Drill.

Patented Dec. 28,1880.

W'hwsmeg f-U ED ATE- PATENT OF IC r -E e. HoLcoMBE, 1on1 GRANBY, coNu, AND cHARLEs A. OHEEVER, or IKEWYORK, n Y.,-ASSI GNORS'TO SAID CHARLES A. CHEEVER, TRUSTEE.

ELECTRICAL ROCK-DRILL.

- srEcmIcA'rioN forming part bf Letters Patent No. 235,948 dated December 28, 1880..

- Be it known that we, ALFRED G. Hoh- COMBE, of Granby, inthe county of Hartford 1 and State of Connecticut, and CHARLES A.-

5 CHEEVER, of the city, county,- and State of New York, both citizens of the United States,

jointly have invented certainnew and useful Improvements in ElectriclIDrills, of which the following is a specification..-

. actuatedb'y electro-magnetismr Its object is to secure a simple, efli'cient, and durable ma chine, which .ends we attain-by certain novel combinations'and organizations of old instru- 5 mentalities, designated by'the' claims at the end of this specification.- I

- Inthe accompanying drawings, Figure 1 re p resents a longitudinal central sect-ionthrongh an elect-ricdi'ill embracing ourir'n'proveinents.

Fig. 2 is a plan View ofthe same, Fig. 3 showsa'" plan view, and Fig. 4 avertical central section -jthro'ugh a device by whichthe drilling-tool may be retracted. Fig. 5 representsa side elevation of a rheotome or circuit-breaker for regulating the speed of the drill. Fig, 6 is a .diagram showing one methodof organizing f t-heapparatus, and'Fig. 7 represents amodifiedformof' the drill. Theapparatus shownin Figs. 3, 4, and 7 is not claimed here, as it 7 3o constitutes the subject-matter of a division of this application filed by us July 39, 1880, serial No. 14,531. A

The mechanism is shown as mounted in a' "skeleton-frame consisting of two heads orcast- 3'5 ings, a'a', united by rods b. The lower or forward". head or, casting is provided with sockets, in'which-areinserted longitudinallyadj ustablelegs c, constituting a; base or tripod,

upon which the mechanism is supported and 0 by means of which it may be adjustedat the 1 V proper angle relatively to its work, 7 4 A coil or'helix, d, of properly -"ins'ulated';.

, wire, constituting an ordina eleetro-magnet, is mounted in a sliding stoc or frame (shown 5 "as consisting of head-pieces c e: having the capacity of sliding upon the rods ,and united by suitable rods, d. A screw-rod, 'm,tu1'ning in suitable bearings' in the frame, is provided with a crank-handle or winch, m",--by which to turn it when desired. The screw of this Application filed Hay -Our invention relates to drills of the class gthelower plate or' casting, e, and through 28, 188i). (No model.)

spindle works ina corresponding screw in a spur-wheel, Z, which turnsin-suitable bearings in the head e of the sliding stock or frame, by which means the st 0ck can be moved longitudinally in either direction desired, The wheel I is normally prevented from turning backward by a spring-pawl, m taking into ratchet-teeth therein or other suitable locking device. I

An ordinary soft-iron core, f, has the capacity of sliding freely endwise through the center-of the coil-or helix, as-usual in instruments "of this class.- A rod, f, constituting .an axial extension of the core, passes through I 5 suitable guides in a box or bracket, e secured to said casting. ,A spiral spring encircles .this rod, and bears at one end against the bracket and at the other against the screw-. nut g on the" rod. By thismeans the resili-. ence of the spring may be adjusted until it is sufficient to act as acounterpoise to the weight of the'core and its'appurtenances,so as normally to hold the parts in the position shown. in Fig. lthat is, ina retracted position-in which position. it will be seen a portion of the core projects beyond the coill A'drilling-tool is secured to the rod-f' by suitable well-known means. A polygonal rod, f constituting an axialextension of the core, passes axially through a gear-Wheel, i, turning in suitable bearings in thehead 6. This polygonal rod has the capacity of sliding freely endwise through the spur-wheel, the two, howevn being compelled to turn together. This spur-wheel tgears with the spur-wheel Z, hereinbefore referred to.

The head j on the-rod f? on each backstroke. acts on an adjustable stud, wiper, or plug fitted on-.a lever, 70, rocking on asuitable pivot or rock-shattk', on the frame. A pawl carried by this lever acts on a series of ratchet-teeth on the-face of the wheel 1 and thusimparts to it an intermittent rotary move ment in a well-known way. The feed-pawl is retracted at each stroke by a suitable recoilspring on its rock-shaft. The distance which the rod is carried at'each stroke of the drill, and consequently the feed of the drill, is regu lated partly by the distance the plug projects from the rocking lever and partly by the length of the stroke .of the drill itself. The

parts are so proportioned that the normal feed imparted to the drill is equal to the distance which it would penetrate the softest substance upon which it is designed to operate. Should from any cause the drill not penetrate its full distance, the conical point of the rod f would prevent the pawl from feeding its full distance until the next stroke, or until the drill had penetrated to the desired depth, when the full feed would be resumed. This automatic correlation of parts prevents the straining or breaking of the ap paratus. It will, of course," be understood that the wheel 2' gears into the wheel Z and revolves it. As the screw m is normally .locked from turning, the frame is necessarily fedforward by the turning of the wheel on its screwed spindle. By this means our improved drill has imparted to it the capacity of being automatically fed forward by the revolution of the screw-wheel Z on the screw,- and of being retracted by' the revolution of the screw-spindle m in the screw-wheel, while the latter is prevented from turning.

Under the organizationabove described it will be seen that the drillingtool is partially rotated automatically on each back-stroke. Instead of the polygonal shatt-and-ratchet arrangement above described for producing this result, it might be accomplished by a curved slot or groove on the rod f in which a spline on the feed-wheel works in a wellknown way. Figs. 3 and a represent a device by which the adjustability of the stock, after completing its forward movement, may instantaneously be retracted to its starting-point. This end .is attained by making the hole through the wheel 1 large enough to enable it to slide freely on the feed-screw m, and providing two half-nuts,

n, sliding in guides on the face of the wheel 1-,

their movements beingcontrolled by pins on a ring, 0, fitting in the half-nuts, so that they embrace the screwwhen the ring is in proper positionthat is, in the position shown in Fig. 3-in which position they are held by a pawl,

o The half-nuts are released from the screw by releasing the pawl and turning the ring.

backward, 'which allows the wheel Z to slide freely on the screw and the stock to slide freely in its bearing. This last-described device is applieableto drills working in horizontal or inclined rather than in vertical positions,unless the drills have their moving parts sulficiently light to be readily lifted. The drill is thrust forward to do its work by electro-magnetism, the electric current being derived from a suita le generator in a well-known way. Fig. 6 represents one organization of the apparatus to] accomplishing this result. The coil or helix is shown as included in an electric circuit in which is also included a suitable generator of electricity, such as adynamoelectric or magneto-electric machine, and a rheotome 0r circuit-breaker, s.

Fig. 1 represents the parts in their normal position'ready to begin work. The passage of an electric current through the coil'or helix.

C draws the core f forward, driving the drill against the surface to be perforated. Asthe drill completes its stroke the circuit is broken, and the core and tool are retracted by the ac- .tionof the counterbalancing-spring g. The

operation above described'is then repeated, by which means the drill may be driven with any desired degree of rapidity. The operation above described may be reversed in well known ways, so as to cause the core to comg press an actuating-spring on its back-stroke, the forward thrust of the-drill being given by the recoil of the spring. r

Fig. 5 shows an adjustable rheotome or circuit-breaker, by means of which the rapidity of the stroke may be varied; but other wellknown forms of circuit-breakers might be enrployed instead.

An elbow-leveigpp rocking on a pivot, p, is provided with an adjustable weight, g, capable of sliding endwise on the arm 19 of the elbow-lever, and provided with a set-screw or other locking device to secure it the desired distance from the pivot. The arm 13 constitutes or carries the armature of an ordinary horseshoe electro-magnet, a, the coils of which.

are connected with circuit wires or conductors a Under the organization shown the current passes along the wire r to the pivot p, v

and along the arm p by the contact-screw r, to the helices ofthe electro-magnct r, and from thence, by the conductor 7 to the helix of the drill, and back to the generator. \Vhen the current passes, the electro-magnet r attracts the armature p untilit strikes the arm 1' thus breaking the contact between the arm 11 and the screw 9", and throwing the rod 1) and weight g into its rearmost position, the resilience of the arm allowingit to bend according to the position of the weight g. The reaction of this spring throws the armature down again, closing the contact at 7", and allowing the current to pass through the helix of the drill again. theduration of the passage of the current being governed by the resilience of the rod 10 and the position of the weight thereon.

The weight, moreover, causes the rod to act as 'a pendulum, and consequently regulates the number of pulsations allowed to pass in a given time. The rod 19 mightbe marked with the number of vibrations incident to. a given adjustment of the-weight, so as to admit of its being readily adjusted to the desired'number of strokes. The rheotome is inclosed, in a box or. casing to protect itfrom dust' or injury.

Two drills might be operated from one rheotome constructed on this principle, by forming another circuit through the stop '1 as shown by the dotted line 1 inwhich circuit a second drill is placed. The return-conductor from this second drill would in this case pass directly to the generator, or join the returnconductor of the first drill. Underthis arof drills the generator is sufficiently powerful ratus, in which the drill is set forth, of the I therein, the coil or helix mounted in the stock,

rangement thetwodrills would be alternately operated, one when the armature of the lever p is in contact with the screw'r, and the other when it is in contact with the stop T The rheotome might be placed. near the generator, if desired, or be placed near the drill,

so as to be readily adjusted by the attendant; or th'erheotome might be mounted directly upon the drill itself.

In Fig. 6 the generator is shown as consisting of a dynamo-electric or magneto-electric machine, 3, connected by a conductor or circuit-wire, r, to the rheotome s, which is, in turn, connected with the helix of the drill by the conductor 4', the circuit being completed from the drill to the generator by the conductor r. in circuit; but it is evident that any number to operate may be placed in circuit.

\ In Fig. 6 a shunt-wire or short circuit, T is shown as connecting the generator and. rheotome, so that the entire current may pass through the generator when the drill is not acting. The conductors? r constitute the drill-circuit, and the conductors r W constitute the short or shunt circuit." These circuitconnections may bevaried in various well- -known ways. i

Fig. 7 shows a modified oi'm of the appadriven positively in both directions, by electro-magnetism and the circuit-breaker is'actuated directly by the drill-stock. We disclaim, broadly, these features, as they are shown in an application, No. 8,370, forLetters Patent of theUnited States, 1 filed by Charles E. Ball, April 26,

We claim as our own invention 1. The combination, substantially as herein set forth, of the frame, the stock adjustable therein, the coil or helix mounted in the stock, the core reciprocating endwise through the coil, the drilling-tool carried by the core, and therecoil-spring. T

'2. The combination,substantially as herein set forth, of the frame, thestock adjustable therein,

coil, the drilling-tool carried recoil-spring, thegenerator, the circuit-connections, and the automatic circuit-breaker.

3. The combination, substantially as herein frame, the stock adjustable the core reciprocating endwise through the coil, the drilling-tool carried by the core, the and automatic feeding mechanism,substantiallysuch-as described, automati recoil-spring,

cally to regulate the feed according ,to the depth of penetration of the drill'at each stroke.

This diagram shows one drill only I the coil or helix mounted in the stock, the core reciprocating endwise through the by the core, the

polygonal rod, constituting a prolongation of the core, its conical head, the feed Wheel through which the rod reciprocates and with which it turns, and the feed-pawl actuated by therodintermittently to rotate the wheel.

' 6. The combination, substantially as herein set forth, of the frame, the stock adjustable therein, the core, .the drillingtool carried thereby, the polygonal rod projecting from the'core, the feed-wheel through which it"re-.

ciprocates andwith which it rotates, the

screw-wheel gearing with thefeed-wheel, and the feed-screw passing therethrough.

7. The combination, substantially as herein set forth, of the frame, the stock adjust-able therein,*the coil or helix mounted in the stock,

the core reciprocating endwise throughthe coil, the drilling-toolcarried'by the core, the

polygonalrod, constituting an extension thereof, the feed-Wheel through which it passes and with which it turns, automatic nechan-* ism, substantially such as described, forintermittently rotatingv the feed -whel, ,thefl screw-wheel gearing with the feed-wheel, the

screw; passing therethrough, andja pawl or;

other suitable detent for' locking the screw while the drillis automatically being fed'forward, but which allows'thescre'w to be lip" tated to retractthe drill; V r

- 8. ,Thecombiu'ation, substantially as herein set forth ,-of thestock, the coil mounted thereinjthe core reciprocating endw-ise through the coil, the drill stock attached the .core,and the recoil -spring mounted on the tool-stock. Y i

roe

9. T The combination, substantially as herein I set'forth, of the. generator, the; electricdrill,

and thecircuit-connections oftheautomatic pendulum circuit breaker, the circuit of r to which is closed bythe attraction of the mag net and broken bythe recoilof the-spri 11g-- arm carrying the pendulum,

JIn testimony whereof We have hereunto set our hands thisf22d'dayof May, A; D; '1880, I

' ALFRED G. HOLCOMBE'.

. OHAS. A. OHEEV ER. Witnessesr 1 JOHN D.-S HED ocK, Q 1. g DwWn LI Ms.

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