US1516858A - Automatic drilling machine - Google Patents

Description

E. J. KINGSBURY AUTOMATIC DRILLING MACHINE 4 Sheets-Shet 2 Filed March 28 1922 E. J. KINGSBURY AUTOMATIC DRILLING MACHINE Filed March 28, I92? 4 Sheets-Sheet 5 Nov, 25, 1924.

E. J. KINGSBURY AUTOMATIC DRILLING MACHINE 4 Sheets-Sheet 4 Filed March 28, 922

Patented Nov. 25, 1224.

UN ET STAT S EDWARD JOSLIN KINGSBURY,

OF IKE-ENE, NEW HAMPSHIRE.

AUTOMATIC DRILLING MACHINE.

Application filed March 28, 1922. Serial No. 547,392,

To all whom it may concern:

Be it known that I, EDWARD J. KINcsBURY, a citizen of the United States, residing at Keene. in the county of Cheshire, State of New Hampshire, have invented certain new and useful Improvements in Automatic Drilling Machines, of which the following is adescription, reference being had to the accompanying drawing and to the figures of reference marked thereon.

My invention relates to new and useful improvements in automatic drilling machines.

An object of the invention is to provide a drilling machine of this character in which the drill spindle is normally held retracted by spring means and fed forward by a cam until a predetermined pressure is applied to the drill spindle, after which the pressure is slightly relieved until the drill has worked forward into the work being done when the predetermined pressure is again applied to the drill spindle.

Another object of my invention is to provide a drilling machine in which the rapid forward movement of the drill spindle is prevented as it breaks through the work and at the same time provides means for automatically returning the drill to its startin point after it has broken through the work and lock it in said retracted position.

A still further object of my invention is to provide a simple and effective mechanism adapted to accomplish the above results and having certain details of structure and combination of parts hereinafter fully set forth.

In the accompanying drawings Figure 1 is a side elevation of an-ordinary vertical drilling machine, showing my invention applied thereto;

Fig. 2 is an enlarged side elevation of the drill feeding and controlling means;

Fig. 3 is a horizontal sectional view of Fig. 2;

Fig. 4 is a side elevation, partly in section, of a modified form of my drill feeding and controlling mechanism; and

Fig. 5 is a top plan view of Fig. 4.

Referring now to the drawings, 1 represents the base of an ordinary vertical drilling machine having a housing 2, in which is arranged a vertical shaft. 3, driven by a motor, or in any desired manner. The upper end of the housingl has a forwardly extending arm 4, in w ich is rotatably mounted the drill spindle 5. The spindle 5 is also longitudinally movable, so that the drill may be fed forward, all of which is well understood. Carried by the drill spindles are the pulley wheels 6, 7 and 8, over any one of which the belt 9 is ada ted to pass, so that the rate of rotation o the drill may be varied by placing the belton the different pulleys. The shaft 3 likewise has three pulleys 10, 11 and 12, over any one of which the belt- 9 is adapted to be placed to correspond with the pulleys on the drill spindles. The arm 4 has a standard 13, to the upper end of which is pivotally connected the lever 14 at 15. This lever has a vertically adjustable screw 16 pivotally mounted therein and at its lower end has a universal joint connection with the upper end of the drill spindle 5, so that the spindle may be adjusted and is freeto rotate and the lever l i is free to swing on its pivot without causing any binding of the drill spindle.

Carried by the housing 2 is a boss 16' having an outwardly extending stud 17, upon which is rotatably' mounted a sleeve 18. which has integral therewith an outwardly extending arm or lever'19, having a laterally turned end 20 through which loosely passes the rod 21. The rod 21, as shown in Fig. 1 of the drawings, is rigidly supported by the base 1 of the machine, and surrounding this rod, above the lever 19 and bearing upon the upper .facethereof, is a coil spring 22. Loosely fitting upon the rod above the spring is an enlarged washer 23, against which the spring bears. Screwed upon the rod, above the washer, are the lock nuts 24 for holding the washer in place on the rod and also for varying the tension of the sprin 22, as will be hereinafter more fully descri ed.

Carried by the lever 19, intermediate the spring and its pivoted end, is a stud 25, which is rotatably mounted in the lever and carries an enlarged friction grooved wheel 26 which frictionally engages the small grooved wheel 27 keyed upon the shaft 28, and which is continuously driven by any desired means, 0d of the drill rotating shaft 3, or by any other desired means, it being understood that this wheel 27 must rotate continuously as long as the drill is rotating and operating. By this structure, it will-be seen that the' large friction wheel 26 is held down upon the small wheel 28 by the spring 22, and is continuously rotat- 1H0.

livotally mounted upon the outer end of the stud 17, intermediate its ends, is a lever 29. The outer end of the lever 29 is pivotally connected at 30 to the rod 31 which extends upwardly and its upper end is pivotally connected at 32 to the lever 14, so that the longitudinal movement of the drill spindle in both directions is controlled, as will be later described. The lever 29, beyond its pivot 30, has connected thereto a coil spring 33, with its lower end connected at 34 to the base 1, so that the tendency of the spring is to draw that end downwardly and throw the outer end upwardly and raise the drill spindle. The lever 29 adjacent its pivot has an enlarged downwardly extending portion 34 which carries a pivot 35 upon which is rotatably mounted a roller 35 which engages the outer periphery of the cam 36 rigidly secured to the outer face of the friction grooved wheel 26. The roller, as shown, is below the cam and the spring 33 at all times holds the same upwardly in engagement with the cam. The cam 36 has a number of cam faces 37, 38,

- 39 and 40 arranged at different points around itsv periphery, each cam face being different for the different character of work upon which the drill may operate, sothat the movement of the drill spindle in a longitudinal direction is controlled.

Carried by the enlarged portion 34 of the lever 29 is a pivoted do 41, having a notched lower end 42 adapte to engage the spring pressed latch 43 held in engagement with the dog 41 by means of a coil s ring 43, and after the lever has travele upwardly under the tension of the spring 33, the dog catches on the latch 43 and the arm is held raised so that the drill spindle cannot be again forced down by the cam until th latch is released.

In operation the small wheel 27 is continuously rotating and the spring 22 holds the large wheel 26 downwardly in contacttherewith and frictionally drives the same. The tension of the spring 33 holds the drill up and at the same time holds the roller 35' in engagement with the cam 36. As the drill cuts its way through the work the cam is slowly rotating, forcing the lever 29 downwardly through the roller 35' and feeding the drill forward. lVhen the drill strikes the work the downward movement of the spindle will be resisted and the cam roller is held against further movement. The cam at this position has the up-slope bearing against the roller andhas the force of the friction drive between the wheels 26 and 27, tending to revolve it. This will cause the cam to climb up on the roller 35" and the wheel 26 carried thereby to move up and slightly separate the wheels 26 and 27 and thus cause a slipping action between the same. The full force of the spring 22 is then imparted to the cam roller and thence through the lever 29 and rod 31 to the drill spindle. This pressure feeds the drill into the work and as the drill punctures the work the cam roller 35 drops and also the cam which allows the wheels 26 and 27 to engage and again start the cam revolving. The climbing action of the cam on the roller 35 is very slight, but it is suflicient to raise the Wheel 26 from 27, so that the full force of the spring 22 is imparted to the drill spindle. This action is very rapid and in close succession so that the actions almost appear continuous. The maximum feed is controlled by the s eed of the drive wheel 27 and the slope o the cam.

In the modification shown in Figs. 4 and 5, a beveled gear wheel 44 is mounted upon a shaft corresponding to the shaft 28 and is continuously rotated. This gear meshes with a beveled gear 45, removably screwed upon the lower end of the sleeve 46. This sleeve has a flange 47 at its upper end which rests upon the upper face of the support 47 carried by the frame of the machine, and the sleeve is rotatably supported yet held against vertical movement. The upper end of the bore of the sleeve is slightly conical at 48, into which fits the clutch member 49, so shaped as to closely fit the bore of the sleeve. The clutch member 49 has a recess 50 in its upper end, in which is arranged a ball 51,- and a member 52 engaging the ball and normally held down on the same by a spring 53, and its upper end bears against an adjustable screw 54, carried by the frame of the machine, so that the sleeve 46 and the clutch member 49 are held in frictional engagement and the member 49 driven by the sleeve.

Connected to the rod 55, which corresponds to the rod 3-1 in the preferred form, is a lever 56 which is pivoted at 57 and provided with a spring 58 which normally holds the lever up and raises the drill from the work. The lower end of the member 49 extends beyond the sleeve 46 and the beveled gear 45 and has keyed thereon a cylindrical sleeve 59, having a cammed lower edge 60 engaged by a roller 61 carried by the lever 56. same manner as that shown in my preferred form, is carried by the lever 56, and needs no further description.

In operation, it will be seen that the gear 44 is continuously operating, which in turn continuously rotates the bevel gear 45 and its sleeve. Through the conical recess and tapering clutch member 49, the clutch member is rotated causing the cam sleeve 59 to rotate and the cam face engaging the roller 61 slowly forces the lever 56 downwardly A latch 62 operated in the and thus feeds the drill. When the desired pressure is on the drill the cam sleeve 59 will climb up on the wheel and slightly raise the clutch member 49 and prevent 1ts rotation or its being driven by the sleeve 46. The moment the drill works forward, the clutch member again drops in engagement with the sleeve and the pressure is applied to the drill through the rotation of pressure on the drill spindle, and automaticmeans for bringing the feeding means into operation when the drill spindle has moved forward under spring pressure.

2. A drilling machine comprising a rotary drill spindle, a cam for feeding the dril spindle forward, automatic means for stopping the cam when the drill stops its forward movement to bring a spring pressure on the drill spindle, and automatic means for starting the cam after .the drill spindle has moved forward under the spring pressure to restore the cam feed.

3. A drilling machine comprising a rota drill spindle, a lever for feeding the drill spindle forward, a spring pressed arm, a rotating cam carried by the arm and engaging the lever for feeding the drill forward. and automatic means for stopping the rotation of the cam when the drill stops moving forward and causing the s ring arm to exert pressure on the drill spindle, and automatic means for. starting the rotation of the cam when the drill spindle has moved forward under the pressure of the spring arm.

4. A drilling machine comprising a rotary drill spindle, a lever for feeding the drill spindle forward, a roller carried by the lever, a spring pressed arm, a frictionally driven cam carried b the arm and engaging the roller carried y the lever, and feeding the drill spindle forward, automatic means for stopping the rotation of the cam when the drill stops moving forward and causing the spring arm to exert pressure on the drill spindle, and automatic means for starting the rotation of the cam when the drill spindle has moved forward under pressure of the spring arm to restore the.

cam feed.

5.. A drilling machine comprising a drill spindle, a frictionally driven cam,'a lever for feeding the drill spindle forward, a roller carried by the lever and engaged by the cam, said cam being adapted to climb up on the roller when the drill is not feeding for .causing the cam to maintain a ward and disengage the friction drive and automatically restore the friction drive when the drill has moved forward.

6. A drilling machine c'omprisin a rotary'drill spindle, a cam for feeding the drill spindle forward, automatic means for predetermined even pressure on the drill splndle for feeding it forward, and automatic means for stopping saidcam feed when the drill is not properly moving forward.

7. A drilling machine comprising a rotary drill spindle, a cam for feeding the drill spindle forward, automatic means for causing the cam to maintain a predetermined even pressure on the drill spindle for feeding it forward, and automatic means for relieving the pressure of the cam when the drill is not moving forward and restoring the pressure when the drill has again moved forward.

8. A drilling machine comprisin a rotary drill spindle, a cam for feedlng the drill spindle forward, and an automatic friction drive for said cam for maintainin a predetermined even pressure on the dril spindle when it is moving forward.

9. A drilling machine comprising a rotary drill spindle, a cam for feeding the drill spindle forward, and an automatic friction drive for said cam for maintaining pressure on the drill spindle when the drill is moving forward and relieving said-cam pressure when the drill ceases to feed forward and to restore said pressure when the drill a ain moves forward.

10. drilling machine comprising a rotarv drill spindle, a lever for feeding the dri 1 forward, a spring connected to the lever for holding the drill in its retracted position, a cam engaging said lever for feeding the drill spindle forward, and automatic means for causing the cam to maintain a predetermined even pressure on the lever for feeding the drill forward at an even pressure. p

11. A drilling machine comprising a retary drill spindle, a lever for feeding the drill spindle forward, a spring connected to the lever for holding the drill in its retracted position,'a cam engaging said lever for feeding the drill spindle forward, and an automatic friction drive for said cam for maintaining a. predetermined even ressure on the leverfor feeding the drill fdrward.

12. A drillin machine comprising a 1'0- tary ,drill spin le, a lever for feeding the drill spindle forward, a spring connected to the lever for holding the drill in its retracted sition, a cam engaging said lever for feedi ig the drill spindle forward, an automatic friction 'drive for said 'cam for maintainin a redetermined even pressure onthe lever or feeding the drill forward and relieving said pressure when the drill is not &

feeding forward and restoring the pressure on the drill s indle when it moves forward.

13. A drilllng machine comprising a rotating drill spindle, a lever connected to said spindle for feeding it forward, a pivoted spring pressed arm, a friction drive wheel mounted on thearm, a continuously driven wheel in engagement with the friction drive wheel, a roller carried by the lever, a cam carried by the friction drive wheel and normally held in engagement with the roller carried by the lever, whereby the lever is forced down by the cam until to feed it forward until the friction driveis again brou ht into action to cause the cam drive to feed the drill forward.

14. A drilling mechanism comprisin a rotating drill spindle a lever connect to the said spindle for feeding it forward, a pivoted spring pressed arm, a continuously driven wheel in enga ement with the friction drive wheel, a ro ler carried by the lever, a cam carried by the friction drive wheel and normall held in engagement with the roller carried by the lever whereby the lever is forced down by the cam until the drill stops its forward movement which causes the cam to climb on the roller and stop the friction drive of the cam and brings the spring arm pressure on the drill to feed it forward until the friction drive is again brought into action to cause the cam drive to feed the drill forward.

In testimony whereof, I affix my signature.

EDWARD JOSLIN KINGSBURY.

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