US628992A - Boring-machine. - Google Patents

Description

No. 628,992 Patented .luly I 8, |899.

H. J. noBEnrs.

BBING MACHINE.

(Application filed Mar. 8, 1895. Renewed Dec. 19, 1898.)

2 Sheets-Sheet l.

om 9 olo wf u l. d, e t n e t a P .E .s Tm RH Ec BA 0M RG. J." .B Hw L 9 nw 8 2 6 o.. N

(Application led Mar. 8, 1895, Renewed Dec. 19, 1898.)

2 Sheets-Sheet 2.

(No Model.)

ariv

norma J. ROBERTS, or CHICAGO, ILLINOIS.

eoRlnie-arrotolaINE.4

SPECIFICATION for'riing part Of Letters Patent NO. 628,992, dated July 18, 1899. i

Application filed March 8, 1895. Renewed December 1i), 1898. Serial No. 699,753'. (No model.)

To all whom, it may concern:

Be it known that I, HOMER J. ROBERTS, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Boring-Machines; and I do 4hereby declare that the following is a full, clear, and exact description thereof, reference being had t-o the accompanying drawings, and to the letters of reference marked thereon, which form a part'of this specification.

This invention relates to portable boringmachines adapted more especially for the convenient boring of holes in joists of a ceiling or floor for the passage of concealedelecfric wires and other purposes.

The object of the invention is toprovide an improved apparatus of the character de scribed which shall be positive in action, effective in operation, durable in construction, and yet comparatively inexpensive.

Another object of the invention is to provide a device with mechanism for rotating a drill or bit carrying spindle in which the operating mechanism shall be within convenient reach of the operator standing upon the door and which may be actuated by a vertical reciprocation of parts--that is to say, by a sliding operating mechanism which may bev pulled down by hand and which may then be returned to its former position either by any suitable lifting mechanism, such as a spring, or by a second downward pull by the operator on a second part acting to return the first. This and other features of the invenwill be more fully understood from the subjoined description of the accompanying drawings and from the appended claims.

In said drawings, Figure 1 illustrates in side view the upper portion of my improved boring device. Fig. 2 represents a central longitudinal vertical sectional view of a portion of the same. Figs. 3 and d represent transverse vertical sectional views taken, respectively, upon the lines 3 3 and il 4 of Fig. 2, looking in the direction indicated by the arrows. Fig. 5 is a side elevation of the entire ,device shown upon a reduced scale, looking endwise upon the parts shown in Figs. 1 and 2; and Fig. is a similar view, somewhat enlarged7 of aportion of the same, looking in a direction at right angles to that of Fig. 5.

I Fig. 7is a View like that of Fig. `5, showing a modification embodying additional features.

rangement of the frame. Fig. 10 is a side View of the latter. Fig. 11 is a horizontal transverse sectional view ofthe same, upon an enlarged scale, taken upon the line 11 11 of Fig. 9 and looking in the direction indicated bythe arrows. Fig. 12 isa View similarto Fig. 1, showing a modified form of thev device. Fig. 13 is 'a central longitudinal verticalsectional View of the modification shown in Fig. l2. Fig. 14 is an end elevation of a portion of the frame shown in Fig. 12. Y Fig. 15 is an end view of adrum, the section being taken on line 15 14E of Fig. 12. Fig. 16 is an end view, partiallyin section, of a partof the winding-drum to show the pawlsand-ratchet mechanism, being taken on line 1616 of Fig. 12.

Referring now to Figs. 1 to 6 inclusi've,'A represents a standard of any suitable construction, material, and strength, adapted to venient place and provided at its upper portion with'an inwardly-projecting recess or socket in which the spindle or stem A of the d rill-carrying frame A2 mayenter and in which said stem A is firmly and adjustably secured by means of an adjusting-bolt CL', adapted to enter a suitable screw-threaded aperture in the said frame-standard A and to engage or to impinge upon the exterior of the spindle or stem A in a familiar manner. By this cnstruction the drill-carrying frame A2 may be adjusted within the frame-standard A as circumstances require. The frame A2 is preferably of. metal and is provided at its ends with upturned arms or supports a2, having suitable recesses in their ends adapted to re- The shaft B is properly secured in position by means of caps CL3, suitably secured to the upturned supports a2 by means of bolts and nuts, the bolts a" passing through suitable apertures in flanges a5, projecting laterally from the said supports CL2 and caps a3, and being secured in position by retaining-nuts a6. The forward end of the shaft B carries the in a modified form, showing the sliding ar` ceive and to constitute bearings for a shaft B.

Fig. S is a detail of one of the handle-grips, f

rest at its base a upon the oor or other con* ICO.

drill-holding spindle or chuck B, in the forward end of which the shank of the spindle or drill B2 is inserted.

Occupying the distance substantially between the adjacent faces of the supports a2 and mounted upon the shaft B are two drums C C', each provided vat its two ends with an outwardly-extending annular iiange c. The two ends of a cable or rope D are secured at opposite ends of the drum C, and said cable or rope winds upon said drum in opposite dicables.

rections, as clearly shown in Fig. 1, so that a downpull uponk one portion of said cable will cause thel drum to revolve and that portion to unwind from the drum, while the other portion of the cable is being simultaneouslyA wound upon the drum, the drum revolving of course in the direction of the cable which is beingunwoundbythepullthereon. Theends of the cable D' are similarly secured to the drum O, and said cable D' is woundupon said drum in precisely the same manner as the cable D is wound upon the drum C, excepting that the sections thereof are wound in directions the reverse of the corresponding sections of the drum C. The cable D', depending from the left-hand side of the drum C', when looking at it as indicated by the arrow X in Fig. l, is trained across to the opposite side of the device and overa guide-pulley A3 and is suitably spliced or secured, as jat d, to the righthand portion of the cable D, while that portion of the cable D depending on the righthand side of the drum G' is similarly trained across and over the opposite side of the pulley A3 and suitably spliced or secured to the left-hand portion of the cable D, the points at which the several cables are spliced being at such distance from the drums C C as never to interfere with the winding of the The two depending portions of the cables D and D' areunited to form a continnous cable, which is trained around a pulley or guide A4, suitably mounted in the lower portion of the standard-frame A. At convenient places upon the cable are hand-grips d' d2, which grips are loosely mounted to slide upon guide-rods d3 d4, secured at opposite sides of the standard A'. From this construction it will readily be understood that the pulling down upon one handle or grip, as d, untilit shallbe in position (for example,shown in Fig. 5) will cause a downward pull and an unwinding of the right-hand coils of both cables D D and the consequent revolution toward the right and left of the drums C C', respectively, while at the same time the lefthand coils ofy the cables will be wound up upon their respective drums. Similarly it will be obvious that the operation of the cables and the directions of rotation of the drums C C will be just the reverse of this when the operator takes hold of the grip d'2 and pulls it down upon the side d4.

The drums C C/ are mounted loosely upon the shaft or spindle B, and in order that each drum maybe engaged positively with said spindle or shaft B at certain times, so as to rotate the latter when the drum is rotated in the proper direction, apawl-and-ratchet mechanism is employed, which will be presently described. The construction of this mechanism is such that each one of the drums may be alternately locked with the shaft B when said drum is being operated or rotated toward the right, but is free to rotate upon the shaft when turned in the opposite direc'- tion, whereby a continuous boring operation is maintained, although the drums are alternately reversed. Provision is also made for reversing the pawl-and-ratchet engagement, whereby the drill maybe withdrawn, and, still further, for positively locking one of the drums to the shaft, whereby the power may be applied to the drill first inone direction and then in the other, as in loosening the drill after having become wedged or fastened in a knot or the-like. This pawl-and-ratchetmechanism is as follows: Surrounding the shaft B is a sleeve E, provided with two annular disks or flanges e e'. This sleeve E is located between the inner end heads c c2 of the drum C and C', respectively, which heads are posil the flange e', while the pawls e2 and e3 are fuly crumed to the iiange e. Vithin suitable apertures e5, extending in or through the sleeve E, are springs e, each of which. is adapted to engage and press against a suitable projection upon each pawl e2 e3 e4, respectively, and thus normally cause the outward or engaging ends of the said pawls to enter the spaces between the several teeth of the ratchets C2 C3. In Figs. 3 and 4 the pawls e3 e4 are shownthus engaged, while the pawl e2 is shown disengaged from the ratchet-teeth C2. The disengagement of the pawls is accomplished by means of sliding pins E, which are arranged within and project through radial openings in the sleeve E andin theshaft B. There are three of these radial sliding pinsE, one for each pawl, each of which engages at its outer end a suitable projection upon the pawl, whereby when said pin is actuated by the means hereinafter described, so as to be protruded at its outer end beyond the periphery of the said sleeve E, it will pressagainst and lift up the engaging projection of the pawl, compress the spring e of said pawl, and, turning said pawl upon its pivot or fulcr'um, lift its outer end out of engagement with the ratchet-teeth, as clearly shown in said Fig. 4. The means for actuating said sliding pins E' is as follows: The shaft B is provided with an axial recess b,extending throughout a portion ofits length, which is adapted to receive a sliding arm F. For convenience of construction said arm is IOS IIO

preferably a circular pin or rod of substantially the same diameter as the diameter of the recess b, provided nearits inner end with a reduced portion or recess f, which is provided at each end with a rounded or beveled shoulderff. The location of the reduced part fis such that when the sliding arm is moved one way or the other said part will be reciprocated between the ends of the pins E', and its length is greater than the distance between the remote sides of ltwo adjacent pins, but less than the distance between the pins farthest apart, so that the inner ends of either two adjacent pins may enter the reduced part or recess at once when the sliding arm is in proper position, but not all three of them. It will be obvious that with this construction the sliding arm may be shifted so that any desired single pawl is permitted to engage or so that the central pawl e3 and the one on either side of it will engage the ratchet simultaneously. The rounded or beveled shoulders f act as cam-surfaces to project the pins E when the arm is shifted, and therefore act to throw the pawls out of engagement.

Means for shifting the arm F are provided in the form of a lever F', fulcrumed to the frame A2 at f2, one end of which is curved upwardly in position to engage the outer end of the said sliding arm. A rod or cord f3 is attached to the other end of the lever, by means of which the lever may be oscillated to force the arm F inwardly against the action of a coiled spring F2, interposed between the inner end of the arm and the end of the bore or recess b.

From the above description it will readily be understood that the operator may move the handle-pieces d' d2 continuously in alternate directions and producea continuous rotary movement of the drill. When the aperture is drilled through the floor-joist or drilled through to the desired extent, the drill may be withdrawn from the aperture by reversing the ratchet mechanism, so as to rotate the drill in an opposite direction. This is accomplished by shifting the arm F, so as to throw the pawls e3 and e4 out of engagement with their Vrespective drums and to permit the pawl e2 to engage the ratchet of the drum C. This will obviously reverse the direction of rotation of the drill; but the latter will be actuated intermittently, since only the drum C is provided with a pawl acting in this direction, and the drill. will therefore remain stationary during the rotation of said drum C in the right-hand direction, while the rotation of the drum C will have no effect whatever on the drill. Obviously the drum C' maybe provided with an additional pawl acting in the same direction as the pawl e?, in which case the rotation ofthe drill wo uld be continuous when reversed, the same as when driven in a right-handed direction. In some cases it may not be necessary to reverse the drill to withdraw' it, but it may be withdrawn by Vsimply pulling it out by hand force or by continuing the feeding revolution of the drill with one hand while applying an outwardlypulling pressure on the implement with the other.

In Fig. 7 I have shown the same machine equipped with devices by which it is adapted for the application of foot-power in conjunction with the hand grip hereinbefore described. is mounted to slide vertically up'on or within the lower part of the standard-frame and carries a pulley or roller G. A cord g, attached at one end to the frame-standard, as at g', is trained around said pulley and attached at its other end to one of the grips d or d2. As thus arranged, it will be obvious that pressure applied on the treadle will aid in pulling down the handle or grip to which the end of the cord is attached, and also that. the treadle will move downward or have a travel less in extent than that of the grip. In order that a part of the power which may be applied by the foot in this manner maybe ntilized to aid the other hand in pulling down the grip d2, a coiled contractive spring G2 is secured at one end to the frame, as at g2, and at its other attached to that one of the cables which will be wound up when the grip d is pulled down in such manner that the also shown for adjusting t-he lengths of the` cables. The upper part of the standard Ais here shown as made to telescope within the lower part thereof, and these parts are held in adjusted relation by means of a set-screw g3, extending through the outer part and engaging the inner in a familiar manner.

The means herein shown for adj usting'the lengths of the cables'consists in dividing the cables at the points where the grips are secured thereon, securing the ends of the lower section to the lower ends of the grips iminovably and extending the ends of the upper cable-section down through holes formed lengthwise through the spool-shaped grips. In the lower end `of each grip is arranged a springpressed friction-clutch in the form of a wedge d5, which engages the cable and prevents the grip from slipping downwardly therein. A knob d isprovided on the end of the wedge, by which the latter may be withdrawn to release the cable.-

In Figs. 9 to 16, inclusive, I have shown a modified form of my invention which comprises but a single drill-actuating drum, but is provided with an auxiliary or power-increasing drum, which may be brought into action when required. As shown in these figures,

I-I designates the drill-actu ating drum, H the In this instance a step or treadle Gk ICO lIO

auxiliary drumband H2 the main driving-cable. The upper part of the standard, the yoke-frame, and bearings for the drums are substantially like those of the first-described iigures and are therefore similarly lettered herein and need not be more particularly described. The spindle or shaft is divided or formed in two sections I I', the adjacent ends of which telescope together, as indicated clearly in the sectional figure, the length of each shaft-section between the bearings corresponding in length to that of the drum thereon exclusive of the telescoping parts. The short section I is desirably secured immovably in the yoke-arm d2, (as herein shown by means of an inner shoulder and a clamping-n ut threaded on the outer end of the shaft,) so as to project therefrom as a stud, although such construction is not necessary. The combined length of the, two drums is somewhat less than the length of the shaft-sections between the yoke-arms, so that the shorter drum Hl may be shifted longitudinally a short distance, and said drums are held normally away from each other by means of a coiled spring J. The outer end of the drum H' is provided with recesses h h, adapted to engage posi tively with a stud h', projecting from the inner-face of the arm a2, when the drum is adjacent to the latter, and the proximate ends of the drums are provided with interlocking lugs h2, adapted to lock the drum so as to rotate together when the drum H is shifted u pv againstL the drum H. A bell-crank lever J', arranged and operated similarly to the lever F of the former machine, acts on the end of the drum I-I to force it into engagement with the drum H against the action of the spring J. The ratchet mechanism in the present instance comprises a disk K, secured rigidly upon the shaft I and provided with a-tlange 7.9, within which is mounted a spring-pressed pawl 7c', adapted to engage with a series of ratchet-notches formed in the periphery of an annular end iiange 4, forming a part of the drum H. The main cable H2 is in the present instance coiled about the forward end of the drum H, trained from thence down and around a pulley Z, carried upon a treadle L, mounted to slide in the lower part of the frame in a manner similar to that of the former device, and from thence carried upward and wound upon the auxiliary drum H. H3 is a second cable, one end of which is coiled about the rearward or left-hand end of the drum H in a direction the reverse of that of the coils of the cable H2 thereon and the other end of which is attached to the upper end of a coiled contractile spring M, similar to the spring G2 hereinbefore described. The lower end of this spring is suitably secured to a cross brace or bar of the standard-frame- Instead of the grips fl d2 of first-described machine a trans- Versely-arranged handle-bar N is provided,

ranged to engage and slide within suitable grooves formed in the inner faces of the two side members of the standard -frame, said guides being attached to and forming the guiding members of the treadle L, so that the handle-bar and treadle necessarily move to gether.

Arranged as above described it will be obvious that when the handle-bar and treadle are downward the main cable H2 will be unwound from the drum H and ,at the same time the auxiliary cable H will be wound up thereon against the tension of the spring M, which, when the pressure is relieved, will reverse the motion of drum, unwind the cable H3, wind up the cable H2, and return all the parts to their normal position, it being understood that the drum I'l is meantime locked in the position shown in the drawings, and is consequently without movement in either direction, and that the cable H2 simply runs around the pulley on the treadle. When, however, it is desired to increase the power `thus applied at the expense of movement or number of revolutions of the drill produced by a single reciprocation of the actuating devices, the drum H' is shifted up into engagement with the drum H, thereby releasing it from engagement from the stud and permitting it to rotate. Inasmuch as this permits the cable H2 to unwind from both drums when treadle is depressed, it follows that if the drums were of equal diameter they would be rotated but one-half as many times with the same stroke of the treadle as in the former case,when one end of the cable was practically immovably attached to the yoke-frame, and that the power is therefore increased in a like proportion.v In the present instance the diameter of the drum I-I is greater than that of the drum I, and consequently the power is still further increased at a corresponding sacrifice of movement.

It will be understood that I do not wish to be limited to the details of construction described herein ezcept as claimed, it being obvious that these may be varied considerably without departing from the spirit of the invention.

I claim as my inventionl l. A boring-machine for overhead boring, comprising a tool-carrying spindle, a drum rotatably mounted thereon havingratchet engagement with the spindle, a standardframe of sufficient length to rest at one end upon the working floor and extend above the reach of the operator at its other end, journal-bearings on the upper end of said stand* ard within which said spindle is mounted, a guide upon the lower part of the standard and an operating-cable having its two ends coiled upon the drum in opposite directions and its intermediate portion trained about the guide, substantially as set forth.

2. A boring-machine for overhead boring comprising a tool-carrying spindle, a drum rotatably mounted thereon and having ratch- IOS IIO

ets adapted to act in opposite directions on the spindle, a standard-frame adapted to rest on the working floor and extend above the head of the operator, a yoke-frame mounted on the standard-frame, provided with bear ings for the tool-carrying spindle, mechanism for shifting the several ratchets into and out of operativeposition, a part of which shifting mechanism is arranged to extend downwardly to a point accessible to the operator, and an operating-cable having its two ends wound upon the drum and its intermediate portion trained around a guide on the lower part of the standard-frame,substantially as set forth.

3. A boring-machine for overhead boring comprising a tool-carrying spin dle, two drums rotatably mounted on the spindle and each having ratchet engagcmentwith the spindle, a standard-frame of a length to rest at one end upon the working floor and extend above the head of the operator at its other end, bearings on said upper end with which the spindle is engaged, and means for driving the spindle comprising two cable-sections wound upon each drum in opposite directions and having depending portions interconnected between the two drums in crossed relation, whereby the drums will be rotated in reverse directions simultaneously and one of the coils of each wound up at the same time its other coil is unwound, substantially as set forth.

4. A boring-machine for overhead boring, comprising atool-carryingspindle,two drums rotatably mounted on the spindle and each having ratchet engagement with the spindle, a standard-frame of a length to rest at one end upon the werking door and extend above the head of the operator at its other end, bearings on said upper end with which the spindle is engaged, and means for driving the spindle comprising two cable-sections wound upon each drum in opposite directions and having depending portions interconnected between the two drums in crossed relation whereby the drums Will be rotated in reverse directions simultaneously and one of the coils of each wound up at the same time its other coil is unwound, said interconnected portion being trained around a guide on the lower part of the standard, substantially as set forth.

5. A boring-machine comprising a toolbarrying spindle,a supporting-frame'with which said spindle has revoluble connection, two drums revolubly mounted upon said spindle, a pawhand-ratchet mechanism in each drum adapted to engage and actuate the spindle when the drum is revolved in one direction, said pawlandfratchct mechanisms of the several drums being arranged to act in the same direction, a third ratchet mechanism in one of said drums adapted to act in a direction the reverse of the other ratchet in the same drum, means for shifting said pawls out of operative position, and au operating-cable wound upon cach drum, substantially as set forth.

G. Abo1ing-1nacl1ine comprising a tool-cai`- rying spindle, a supportingframe in which said spindle is revolu bly mounted, two drums revolubly mounted upon the spindle, a pawland-ratchet mechanism foreach drum adapted to engage and actuate the spindle with the drum, said pawlsof the several drums being arranged to act in the same direction, a third pawl for one of the drums, arranged to act on the spin dlein a direction the reverse of the other pawl of said drum, means for shifting said pawls out of operative positions, comprising a member movable longitudinally within the drums and provided with camsurfaces adapted to force said pawls out of engagement with the ratchets and operatingcables wound upon each drum, substantially as set forth.

7. Aboring-mael1ine comprising a tool-carrying spindle, a supporting-frame in which said spindle is revolubly mounted, two drums revolubly mounted upon the spindle, each provided with a series of ratchet-notches, a spring-pressed pawl for each drum, mounted upon the shaft, said pawls being arranged to act in the same direction, a third pawl mounted upon the shaft and adapted to engage the ratchet-notches of one drum in a direction the reverse of the other pawl acting on vsaid drum, means for moving said pawls out of operative engagement With their several drums, eomprisinga recess extending longitudinally of the spindle, pins extending from the pawls through the shaft into said recess, an' arm, provided with cam-surfaces adapted to act on said pins, and arranged to slide Within said recess, and an actuating-cable wou nd upon each drum, substantially as set forth.

8. A boring-machine comprising a tool-carrying spindle, a supporting-frame in which said spindle is revolubly mounted, two drums revolubly mounted upon the spindle, each provided with a series of ratchet-notches, a springpressed pawl for each drum, mounted upon the shaft, said pawls being arranged to act in the same direction, a third pawlmounted upon the shaft and adapted to engage the ratchet-notches of one drum in a direction the reverse of the other pawl acting on said drum, means for moving said pawls ont of operative engagement with their several drums, comprising a recess extending Ylongitudinally of the spindle, pins extending from the pawls through the shaft into said recess, an arm,

said pins; and arranged to slide within said recess, a lever pivoted on the frame and arranged to shift said arm longitudinally and an actuatingbable wound upon each drum, substantially as set forth.

9. Aboring-maehine comprising a toolcar rying spindle,a driving-drum operatively connected therewith,asuppOrtingstandard-frame ed, a driving-cable having each of its ends wound upon the driving-drum and its interl mediate portion trained about a guide-pulley provided with cam-surfaces adapted to act onv upon which the spindle anddrum are mount- IOO IIO'

IZO

mounted on the standard-frame, a second pulley mounted upon avertically-sliding treadle arranged within the lower part of the standard-frame,an auxiliary driving-cable attached at one end to frame above the treadle, trained around the pulley of the latter and attached to the main driving-cable, and a hand-gri p atltached to the cable and arranged to slide upon guides at each side of the standardframe, substantially as set forth.

10. A boring-machine comprising a toolcarrying spindle, a frame within which said spindle is mounted and a change-speed driving mechanism for the spindle comprising a drum operatively connected with the spindle,

' a second drum mounted to rotate concentrically with the former drum, an operating-ca ble having its opposite ends wound upon the respective drums, and means forlocking the second drum from rotation and also for locking it so as to rotate with the other drum, substantially as set forth.

1l. A boring-machine comprising a toolcarrying spindle, a frame within which said spindle is mounted and a change-speed driving mechanism for the spindle comprising a drum mounted upon the spindle and operatively connected therewith, a second drum mounted upon the spindle adjacent to the former, a spring interposed between said drums to force them normally apart, an operating-cable having each end wound upon one of the several drums, said ends being Wound in the same direction, and means for locking said second drum to the frame and also for locking it to rotate with the other drum, substantially as set forth.

l2. A boring-machine comprising a toolcarrying spindle, a frame within which said spindle is mounted and a change-speed driving mechanism for the spindle comprising a drum mounted upon the spindle and operatively connected therewith, a second drum mounted upon the spindle adjacent to the former, a spring interposed between said drums to force them normally apart, an operating-cable having each end wound upon one of the several drums, said ends being wound in the same direction, a second cable wound upon one of said drums in a direction opposite that of the first cable, and a spring arranged to lact on said second cable to resist winding up of the latter, substantially as set forth.

13. A boring-machine for overhead boring, comprising a tool-carrying spindle, a drum rotatably mounted thereon; having ratchet engagement with the spindle, a standardframe of a length to rest at one end upon the working floor and extend above the reach of the operator at its other end, journal-bearings With which said spindle has engagement at said upper end, a guide upon the lower part of the standard, an operating-cable having its ends coiled upon the drum in opposite directions and itsintermediate portion trained about the said guide, a treadle mounted to slide vertically upon the lower part of the standard and provided with a guide-pulley, and an auxiliary cable secured at one end to a part of the standard trained thence around the treadle-pulley and secured at its other end to a part of the main operating-cable, substantially as set forth.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

HOMER J. ROBERTS.

l/Vitnesses: p

TAYLOR E. BROWN, ALBERT H. GRAVES.

Images