US1054268A - Drilling-machine. - Google Patents

Description

B. P. BARNES.

DRILLING MACHINE.

APPLICATION FILED MAY15, 190a.

Patented Feb. 25, 1913.

2 SHEETS-SHEET 1.

B. F. BARNES. DRILLING MACHINE. APPLICATION FILED MAY 15, 1908.

1,054,268. V Patented Feb. 25, 19B.

2 SHEETS-SHEET 2.

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* Jaw/Z5" PATENT OFFICE.

BENJAMIN F. BARNES, OF ROCKFORD, ILLINOIS.

DRILLING-MACHINE.

Specification of Letters Patent.

Patented Feb. 25,1913.

. Application filed May 15, 1908. Serial No. 433,089.

1 all whom it may concern:

Be it known that I, BENJAMIN F. Banxns. a citizen of the United States, residing at Rockford, in the county of lVinnebago and State of Illinois, have invented certain new and useful Improvements in Drilling-Madle.

chines, of which the following is a specification.

This invention relates to the spindle-feed mechanisms of drilling machines, and one of its objects is to provide means for obtaining an exceedingly fine graduation of the feed speed of the spindle.

Another object is to provide improved means for manually feeding the drill spin- In some of the constructions heretofore used, a hand lever having a ratchet connection with the cross spindle of the drill is employed when it'is desired to advance the drill spindle manually. and a hand wheel also mounted on the cross spindle is used to return the drill spindle. The hand wheel cannot be used toadvance the spindle owing to the slight leverage afforded by said wheel. The ratchet lever, while affording the leverage that is desirable, provides only an intermittent feed of the drill spindle, and furthermore in practice sometimes becomes loosened from its holding device when not in use and falls, injuring the operator. By my invention I dispense with the, ratchet lever and the quick-return hand wheel, and substitute therefor a single hand wheel affording suflicient leverage to be used for advancing the spindle and also capable of use in returning the spindle.

In the accompanying drawings, Figure 1 is aside elevation of the principal part of a drilling machine embodying the features of my invention. Fig. 2 is a front view of certain parts shown in Fig. 1. Fig. 3 is a section on dotted line 3 3 of Fig. 2. Fig.

i 4 is a view showing the gearing for conand the back gearing 5.

necting the shaft 14 to the spindle.

z The embodiment selected for illustration is an upright drill having a supporting frame 1 in which is slidably mounted the drill spindle 2. Said spindle is rotated and advanced by means comprising an inclined shaft 3, power being communicated to said shaft through the change-speed gearing 4' As shown in Fig. 1, the change-speed gears 4 are slidably -mounted upon a shaft 4 and are adapted to mesh with. gears 4 on a shaft 3. The shafts 3 and 3 are alined and abut at 3.

On the shaft 3 is a gear 4 that meshes with one of the back gears 5 on the shaft 5. The shafts 4e ant 5 are alined, the adjacent ends of said shafts being supported in the bearing 1. The other back gear 5 is adapted to mesh with a gear 5* slidably mounted on the shaft The gear 5 is provided with a clutch portion 5 adapted to engage with a clutch portion 4 on the gear 4, in order to couple the shafts 3 and 3 directly together. \Vhen the change-speed gears and back gears are arranged as indicated in Fig. 1, power is transmitted from the shaft 4'. through one of the gears 4 to one of the gears 1" on the shaft 3, thence through the gear t" to one of the gears 5 and through the other gear 5 to the gear 5 on the shaft 3. On the upper end of the shaft 3 is a gear wheel 3 that meshes with a gear wheel 2 operatively connected with the spindle 2 to rotate the latter. Operatively connected with the drill spindle 2 is a rack bar 6, the teeth of which mesh with a pinion 7 fixed upon a cross spindle 0r shaft 8. Upon one end of the shaft 8 is fixed an internal spur gear 9 which meshes with a pinion 10 upon a shaft 11. At the opposite side of the machine the shaft 11 carries a worm wheel 12 that meshes with 'a worm 13 fixed to the lower end of a vertical shaft 14. The latter shaft is rotatably supported in a bracket 15 that is pivoted upon a shaft 16. The bracket 15 is moved to carry the worm 13 into and out of operative relation with the worm wheel 12by means of a hand lever 17 pivoted upon the shaft 11. Said hand lever has in its rear end a cam slot 18 in which lies a stud 19 that is carried by the swinging bracket 15. Fixed to the upper end of the vertical shaft 14 is a bevel gear 20 meshing with a similar. gear 21 fixed upon the shaft 16.

A plurality of arms 11 (in this lnstance three) is fixed upon one end of the shaft 11 in equidistant relation. Said arms virtually constitute a hand wheel, and form means for manually rotating the shaft 11 to feed the drill spindle downwardly or to return said spindle to its initial position.

As will be understood, the gear train 6, 7 9, 1O connecting the hand wheel 11 w th the drill spindle affords great leverage, with consequent great pressure in the down feed. The hand Wheel 11 enables the operator to movement when a hand feed is desirable.

' able that the hand wheel shall rotate in the same direction as thedrill spindle is moving; in other words, that the front of the hand wheel shall swing downwardly when the spindle descends. The internal gearing 9 10 renders possible such direction of movement, with great leverage, without the use of a long gear train.

The power feed for the spindle will next be described. I

The shaft 16 is driven from the shaft 3 by means permitting of an adjustment of the feed speed by minute gradations. One example of such a means will now be described.

A'tubular shaft 22 is rotatably supported in a bearing 23 in the machineframe and is driven from the shaft 3, in this instance, by means of a skew ear 24 fixed on the shaft 22 and meshing with a skew gear 25 fixed to the shaft 3. Upon one endof the shaft 23 is a crank arm 26. Fixed upon the shaft 16 is a ratchet wheel 27 adapted to be engaged by two pawls 28 and 29 carried by rocker arms 30, said arms being rotatably mounted upon said shaft. The pawls 28 and 29 may be yieldingly held in engagement with the ratchet wheel 27 by any suitable means, such as springs (not shown). The rockerarms 30 areswung by the crank arm-26 through.

the medium, for example, of links 31 connected at their upper ends to said rocker arms and attached at 32 to an arm 33 pivotally connected at one end with the crank arm 26. Fixed to the arm 33 is a sector 34 that meshes with a pinion 35 rigidly mounted upon one end of a shaft 36 which is rotatably supported within the tubular shaft 22. In the opposite end of the shaft 36 is a pin 37 which extends into one or more cam slots 38 formed in an adjusting sleeve 39 that is slidable longitudinally of the tubular shaft 22, but is arranged to be rotated therewith by suitable means such as a key 40 lying in the tubular shaft '22 and in a keyway 41 in said sleeve;

The adjusting sleeve 39 may be slid longitudinally of the tubular shaft 22 to cause relative. rotation between the shafts22 and 36 by any suitable means, such as a pinion -42 fixed upon. the rear endof a shaft 43 that is rotatably supported in hearings in the machine frame. The teeth of the pinion 42 mesh with a' series of annular ribs or rack teeth 44 formed upon the periphery of the adjusting sleeve 39. To the forward end of the shaft 43 is fixed a lever 45 which may be of spring material, as shown, and which carries a handle 46 and a locking pin 47,the latter being adapted to engage inariy of a series of openings 48 in a dial 49 fixed in the machine frame.

In operation, the rotation of the shaft 3 is cated to the tubular shaft 7 22 through the gears 24 and 25, the crank arm 26 fixed to said tubular shaft being revolved,

andsaid crank arm carrying wit-h it the arm 33. Said arm is normally immovable with relation to said crank arm so as virtually to constitute a fixed portion thereof,

22 by moving the hand lever 45, a movementof said lever causing a movement of the adjusting sleeve 39 longitudinally of said shaft 2 and therefore causing rotation of the shaft 36 with relation to the shaft 22. The movement of the point '32 toward or away from the axis of the shaft 22 causes a' corresponding change in the extent of the swmging movements of the rocker arms 31, and consequently an alteration in the length of the feed movements of the pawls 28 and 29. It will be seen that the farther away the point 32 is from the rotative center of the shaft 22 the longer will be the. feed movements of said pawls and the greater the spindle-feed speed, and that the nearer said point approaches said rotative center, the slower will be the spindle-feed speed. The adjustable drive herein shown for the shaft 16- makes possible a large number of. different spindle-feed speeds, changes in feed speeds being conveniently and quickly made by means of the hand lever '45. a

I recognize the factthat various changes may be made in the embodiment herein description, except as set-forth in the appended claims,

I claim as my invention:

1. In aspindle feed for drilling machines, in combination, a shaft, a reciprocatory member having a driving connection with said shaft, a crank arm, means for rotating said crank arm, a member lying alongside of said crank arm and having one end pivoted thereto, said member having its other or free end connected to said reciprocatory member, means for pivotally adjusting the said free end of said member with relation to said crank arm toward and away from the axis of said crank arm, whereby to change the length of reciprocatory movement of said reciprocatory member, and spindle feed means connected to said shaft.

2. In a spindle feed for drilling machines, in combination, a rotary shaft,

inasmuch as said arm has fixed thereto the toward or away from the axis of the'shaft shown, therefore no undue limitation should be understood from the foregoing detailed means connecting said shaft with the drill spindle for feeding the latter, a ratchet wheel fixed on said shaft, two rocker arms pivoted on said shaft, a pawl carried by each of said rocker ar1ns,-and both engaging said ratchet wheel, a second shaft, a crank arm on one end thereof, a member pivoted at one end to the outer end of said crank arm, a pair of links connecting the other or free end of said member to said rocker arms, and means concentric with said second shaft for adjusting said free end of said member toward and away from the center of said second shaft, whereby to change the length of stroke of said pawls and thus adjust the feed of the spindle.

In a spindle feed for drilling machines, the combination of a shaft, means for rotating said shaft, a crank arm on said shaft, a member pivoted at one end to said crank arm, means whereby the free end of said member may be adjusted and held at varying distances from the axis of said shaft, and spindle-feed means connected with the free end of said member.

4. In a drilling machine, the combination of a shaft, means for rotating said shaft, a crank on said shaft, and means for adjusting the throw of said crank comprising a shaft, a sleeve mo able longitudinally of the first mentioned shaft and arranged to rotate therewith, said sleeve having a cam slot therein, means carried by the second mentioned shaft and engaging in said slot, said sleeve having annular rack teeth thereon, a pinion meshing with said rack teeth, means for rotating said pinion and locking it against rotation and spindle-feed means connected to said crank.

5. An upright drill having a spindle, and a minutely-variable spindle feed comprising a crank arm, a member pivoted at one end to said crank arm, operative means interposed between .theother or free end of said member and the spindle for feeding the latter, a tubular shaft to which said crank arm is connected, a shaft in said tubular shaft andgeared to said member for pivotally movlng the latter with relation to said crank arm, and means for rotating the inner shaft with relation to the tubular shaft and for locking said shafts together.

6. In an upright drilling machine, the combination of a vertical spindle, a shaft connected with said spindle for rotating the latter, a shaft geared to said spindle for moving said spindle longitudinally, and means for communicating power from the first mentioned shaft to the second mentioned shaft, said means comprising a shaft havlng a ratchet wheel thereon, a rocker arm pivoted on the last mentioned shaft, a pawl carried by said rocker arm and engaging said ratchet wheel, a shaft geared to the first mentioned shaft, a crank on the last mentioned shaft, means for adjusting the throw of said crank, and means connecting said crank with said rocker arm.

7. In an upright drilling machine, the

combination of a vertical spindle at the forward side of the machine, a drive shaft at the rear side of the machine and geared to said spindle for rotating the latter, means between said drive shaft and said spindle adapted to automatically feed said spindle downward, said means comprising a shaft having a ratchet wheel fixed thereon, a rocker arm, a pawl carried by said rocker arm and engaging said ratchet wheel, a

shaft having a crank arm thereon, means connecting said crank arm with said rocker arm, and means for adjusting the throw of said crank arm comprising a sleeve movable longitudinally of said crank-arm-shaft and arranged to rotate therewith, a shaft connected with said sleeve to be rotated by a sliding movement of said sleeve, said sleeve having annular rack teeth thereon. a shaft extending from the forward side of the ma chine, the last mentioned shaft having a pinion at its rear end meshing with said annular rack teeth, and a crank at the for-. ward end of the last mentioned shaft for rotating it to slide said sleeve.

8. In a drilling machine, the combination 5 of a spindle, a drive shaft connected with said spindle for rotating the latter, and spindle-feeding means comprising three shafts positioned intermediate the spindle and said drive shaft, one of said shafts be ing geared to said drive shaft, another of said shafts being geared to said spindle for feeding the latter, the last mentioned shaft having a hand lever thereon, the third one of said shafts being detachably connected with said hand lever-shaft; and a connection between the first-mentioned and the third-mentioned of said three shafts, said connection including a crank and means operable while said shafts are in motion for adjusting the throw of said crank to provide for minutely varying the feed of said spindle.

9. In an upright drilling machine, the

combination of a vertical spindle. a drive shaft connected with said spindle for rotating the latter, and spindle feeding means comprising three short horizontally-extending shafts positioned intermediate the spindle and said drive shaft, the first of said three shafts being geared to said drive shaft and having a crank arm thereon, means for adjusting the throw of said crank arm, means connected with said crank arm for retating the second one of said shafts, a tie- 1 5 tachable connection between said second shaft and the third one of said three shafts, said third shaft having a hand wheel thereon and gearing interposed between the said third shaft and the-spindle, whereby the lat- 30 ter may be manually fed 01 tating said third shaft.

10. In an upright drilling machine, the combination of a vertical spindle, an in clined drive shaft geared to said spindle for rotating the latter, and spindle feeding means comprising three short horizontal shafts positioned intermediate the spindle and said drive shaft, the first of said three shafts being geared to said drive shaft, the second of said shafts being positioned above said first shaft and having an adjust-able driving connection therewith, a third one of said shafts being positioned below said second shaft and. having a gear connection with said spindle, whereby the latter may be fed downwardly third shaft, and a detachable connection between the second shaft-and the third shaft, including a pivoted bracket and a shaft mounted in said bracket, the last mentioned shaft being positively geared to said second shaft and having a detachable worm-andwheel connection with the said third shaft. 1 1. In an upright drilling machine, the combination of a supporting frame; a spindle mounted in the frame for vertical movement; a gear wheel supported by the frame and operatively connected to said spindle for rotating the latter; a shaft mounted in the frame below said gear wheel and'operownwardly by roatively connected to said by manually rotating said spindle for feeding the latter; an inclined shaft mounted in the frame and having at its upper end a gear wheel for driving the first mentioned gear wheel, and a gear wheel for driving said feed shaft; and means for driving said inclined shaft at variable speeds.

12. In an upright drilling machine, the combination of a supporting frame; a spine dle mounted in the frame for vertical move ment; a gear wheel supported by the frame and operatively connected to ,said spindle for rotating the latter; a shaft mounted in the frame below said tively connected to said spindle for feeding the latter; an inclined shaft mounted in the frame and having at its upper end agear wheel for driving the first mentioned gear wheel, and a gear wheel for driving said feed shaft; an inclined shaft alined with said first mentioned inclined shaft; two alined inclined shafts extending parallel to the first mentioned inclined shafts; and change-speed gearing and back gearing operatively connecting said pairs of inclined shafts BENJAMIN F. BARNES.

Witnesses:

L. L. MILLER, GEORGE L. CHINDAHL'.

gear wheel and opera-

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