US2283469A - Boring mechanism - Google Patents

Description

May 19, 1942 H. B. sHEPARD v2,283,469 y BORING MECHANISM Filed Feb. l, 1941 4 Sheets-Sheet 2 Fig. E.

May l9, 1942-. .l5-l. SHEPARD BORING MECHANISM v Filed Feb. 1, 1941 4 sheets-sheet s May 19, 1942.

BORING MECHANISM Filed Feb. 1, 1s 41 4 sheets-snee; 4

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1 H. B. sHEPAD 2,283,469 l Patented May 19, 1942 BORING MECHANISM Henry B. Shepard, Newton, Mass., assignor to Stowe-Woodward, Inc., Newton Upper Falls, Mass., a corporation of Massachusetts Application February 1, 1941, Serial No. 377,063

11 Claims.

This invention relates to a device whereby a hole at least in part curved may be quickly and accurately bored with a drill having a rigid straight shank.

A particular application of the invention is to the boring of finger-receiving holes in hard rubber bowling balls. In my copending application, Serial No. 377,064, filed February 1, 1941, I have disclosed such a ball having finger-receiving holes of circular cross-section and each including an outer straight portion to oppose the medial phalange of the linger inserted therein, a curved portion in the form of a spiral arc with its conveXity opposing the palmar side of the finger at the joint between the medial and distal phalanges and an inner straight portion to oppose the distal phalange. The proportions of the various parts are such as to suit the individual who is to use the ball; that is, in general each ball is individually drilled and will differ more or less from ing mechanism a drill press of conventional construction to provide means for holding and rotating a drill and by the feed of its spindle to effect relative rectilinear movement between the drill and work. Therefore, from one pointl of View, in the case of the embodiment illustrated,

the invention provides an attachment for a drill press whereby boring work of the kind referred to may be done.

My invention will be well understood by reference to the following description taken in connection with the accompanying drawings, where- Fig. 1 is a side elevation of a drill press and an attachment thereto whereby it becomes a drilling mechanism exemplifying the invention;

Fig. 2 is a View on a larger scale of some of the parts shown in Fig. 1 with part in vertical section;

Fig. 3 is a View like Fig. 2 showing the parts in another position;

Fig. 4 is a plan of the drilling attachment; and

Fig. 5 is an end View as seen from the left in Fig. 4.

Referring to Fig. 1 of the drawings, I have there shown a drill press of ordinary construction having a work-supporting table 6 which is opposed by the spindle 8 carrying the drill-receiving chuck Ill. The spindle is rotated by the pulleys I2 and may be fed axially by the hand wheel I4. The drill here shown has an enlarged head I6,

which may be generally similar to a short segment of an ordinary metal boring twist drill, supported by a reduced shank I8. When a curved hole is bored, as in Fig. 3, a limit is imposed by the engagement of the shank I8 of the drill with the side of the hole. It will be understood that the drill might move somewhatbeyond the position shown in Fig. 3 corresponding to a further ,advance of the drill head downwardly and toward the left around the curve there shown by providing a clearance for the shank of the drill at the right in the figure, as, for instance, by permitting the shank to abrade its Way past the outer margin of the hole. While such a surface imperfection might be permissible in some cases, it usually can be avoided. l

In the drawings the adjustment ofthe parts which I am about to describe is 4such as to provide for boring a bowling ball with a hole consisting of an outer spiral arc terminating in an inner straight portion. A manner of adjusting the mechanism to provide an outer straight portion before the hole begins to curve will be referred Vto as the description proceeds. v

To provide for supporting the bowling ball or other piece of work and to permit a relative rotative movement betweenthe drill and work simultaneously with rectilinearmovement effected by the feed of the drill I provide a suitable support which herein takes the form of a frame 28 adapted to be mounted on the table 6 of the drill press and which may be secured by the bolts 22 in the usual slots in the latter providing for its adjustment relative to the line of the drill, as by moving it upwardly or downwardly, viewing Fig. 4, that is, transversely to the plane of the paper in Figs. 1, 2 and 3. Trunnions 24 on the sides of the frame provide for the swinging support of a cradle 26 in which the ball B is received. This cradle may embody an end -wall on which is mounted a concaved pad 28 of soft rubber against which one side of the ball may rest while a similar pad 30 is carried on the head 32 of an adjusting screw 34 opposing the pad 28 permitting the ball to be clamped at diametrically opposed points, as shown in Figs. 2 and 3, and so positioned.

While the drill rotates, it and the work are capable of two relative motions, a rectilinear motion axial of the drill, herein effected by the feed of the spindle, and a relative rotary or swinging rectilinear movement during atleast a portion of the latter. When the drill is raised, the cradle 26 may be swung downwardly clockwise beyond the positions of Figs. 1 and 2 to provide for easy insertion of the ball. The position shown, for instance, in Fig. 2 may be considered an initial operative position as distinct from a loading position and herein I have shown a removable strut 36 adapted to support the cradle in this position from below but permitting its movement from that position in a counterclockwise direction. In Fig. 2 the drill head I5 is illustrated as just about to commence to form a hole in the ball and in the adjustment of parts shown the succeeding drilling action will be along a curved arc due to a downward feed of the drill and a counterclockwise rotation of the ball in its cradle about the journals 24. To effect this motion the cradle carriesa suitable abutment remote from the pivot point 24 to permit a rotating torque to be exerted on the cradle and herein this abutment is in the form of a transverse roller 38 constituting a cam bowl or follower, which is supported by arms 45 extending from the sides of the cradle. Cooperating with the roller 38 is an edge cam or wiper in fixed relation to the spindle of the drill whenthe frame is adjusted in a plane perpendicular to the paper, viewing Figs. 2 and 3. The cam is driven through a wrist pin 481 attached thereto over which engages the forked end of an arm 55, the other endof which is pivoted to a collar 52 which may be clamped about the spindle of the press. It is clear that with the parts in the position of Fig. 2, if the spindle of the press is fed downwardly, the cam will swing clockwise and, if its edge is properly shaped, it will through the follower roller 38 swing the cradle 26 counterclockwise, viewing the figure, so that the opening formed by the drill will be curved as illustrated in Fig. 3. Normally the permissible limit of swinging movement of the ball B is determined by A the engagement of the shank ISB of the drill with the side of the curved hole, as illustrated in Fig. 3.

To interrupt the swinging movement of the work when such engagement occurs or at an earlier time if conditions so indicate, while permitting continued feed of the drill and a continuation of the hole in a right line the rise portion of the cam, at the low point of which the roller 38 is shown engaged in Fig. 2, terminates in a circular portion 55. In Fig. 3 the follower 38 has moved under this circular portion 54. This construction permits continued rotation of the cam as the drill spindle descends in that gure without corresponding swinging movement of the ball-carrying cradle although, as will be apparent from the figure, the cam 4Z will serve as a supporting member cooperating with the roller 38 to hold the cradle in the elevated or up-swung position shown in Fig. 3. In other words, while the swinging cradle is actuated by the feed of the drill spindle, a lost motion is provided between them which permits continuation of the boring operation in a rectilinear direction after the completion of the desired curve.

When it is desired to provide the bored hole with an initial straight portion, before the curvilinear boring commences a lost motion may be provided during the initial portion of the relative vertical movement of the drill and work. In order to accomplish this I have herein shown the arm 5D as of adjustable length, being formed in two parts with a slot and bolt connection at 56 while the forked end which embraces the wrist pin 48 is of considerable length to provide a slot which will permit substantial shortening of the arm without disengagement of the same from the wrist pin. It will be plain that if the arm 58 were shortened with the other parts in the position shown in Fig. 2, there Would be provided a clearance between the bottom of this slot and the wrist pin 48 which would permit the arm 50 to descend idly as the drill spindle was fed downwardly before it exerted any force on the wrist pin to turn the cam and thereby to tilt Vthe with the ball at the beginning of such feed, as in Fig. 2, the first action of the drill would be'tol bore a straight cylindrical hole until this lost motion was taken up when the work would commence to swing to provide a continuation of the hole as a curve until the follower 38 reached the circular portion 54 of the cam, causing again a lost motion between the drill spindle and the mechanism for swinging cradle 26.

I am aware that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive; reference being had to the appended claims rather than to the foregoing description to. indicate the scope of the invention.

I claim:

1. A boring appliance comprising a drill-rotating means, a work support, means for relatively translating them in the direction of the axis of rotation of the drill and means responsive to such translative movement for also simultaneously swinging one about a line transverse to said axis and at a side thereof.

2. A boring appliance comprising a drill-rotating means, a work support, means for relatively translating them in the direction of the axis of rotation of the drill and means for simultaneously swinging one about a line transverse to said axis and' at a side thereof during a selected portion of such translative movement. n

3. A boring appliance comprising a drill-rotating means, a work support, means for relatively translating them in the direction of the axis of rotation of the' drill and means for simultaneously swinging one about a line transverse to said axis comprising a cam which is rotated consequently to translative movement.

4. A boring apparatus comprising a drillrotating means, a work holder, one being guided for rectilinear movement toward the other in the direction of the axis of rotation of the drill, and one being mounted for swinging movement about a line transverse to said axis and at one side thereof, and means forV exerting torque about said line on the swinging element, said means being connected to the other element to be actuated thereby whereby swinging is effected simultaneously with a feeding movement.

5. A boring apparatus comprising a drillrotating means, a work holder, one beingA guided for rectilinear movement toward the other in the direction of the axis of rotation of the drill, and one being mounted for swingingmovement; about a line transverse to said axis and at one side thereof, means for exerting torque on said swinging element at a point remote from said line including a driving arm connected to said other element having a lost motion connection to said means at the later portion ofvthe operative travel of the parts.

6. A boring apparatus comprising a drillrotating means, a work holder, one being guided other element having a lost motion connection.,

to said means at the earlier portion of the operative travel of the parts.

7. A-n attachment for a drill press comprising a frame, a work holder journalled therein having an abutment element at a point remote from its pivot, means for exerting force on said abutment element Yto swing the holder including an actuating arm and means for connecting the arm to the travelling spindle of the press.

8. An attachment for a drill press comprising a frame, a work holder journalled therein having an abutment element at a point remote from its pivot, means for exerting force on said abutment element to swing the holder including an actuating arm having lost motion ,relative to said A `means during the later portion of its actuating stroke and means for connecting the arm to the travelling spindle of the press.

9. An attachment for a drill press comprising .a frame, a work holder journalled therein having an abutment element at a point remote from its pivot, means for exerting force on said abutment element to swing the holder including an actuating arm having lost motion relative to said means during the earlier portion of its actuating stroke and means for connecting the arm to the travelling spindle ofthe press.

10. An attachment for a drill press comprising e a frame, a work holder journalled therein having an abutment element at a point remote from its pivot, a cam cooperating with the abutment and Y means for driving the cam responsive to the travel of the spindle of thepress. l1. A boring appliance comprising a drillrotating means, a work support, the two being

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