US1607709A - Adjustable drill chuck - Google Patents

Description

L. H. VO LD ADJUSTABLE DRILL CHUCK Nov. 23 1926. 1,607,709

Filed Feb: 4, 1925 WITNESSES INVENTOR I im, H.7r aL Patented Nov. 23, 1926.

UNITED STATES LABS H. VOLD, 0F BUTLER, PENNSYLVANIA.

ADJUSTABLE DRILL CHUCK.

Application filed February 4, 1925.

This invention relates to multiple drill presses, and particularly to adjustable drill chucks for use in connection therewith.

Heretofore, in drill presses of this character, it has been frequently not only inconvenient to easily, quickly, and accurately adjust the entire number or gang of bits used to the desired relative positions axially of the bits but great difficulty has been experienced to positively lock the bits against displacement after the desired adjustment is made. It is highly desirable to provide a multiple drill press equipped with means which will enable the operator to easily and quickly bring the tips of all of the bits employed into exact alignment, or other necessary relative disposition required by the work being operated upon, which will at the same time assure such setting being positively 1naintained when once made, regardless of the simultaneous bodily movement of the entire gang of bits as a unit during repeated use. It is the object of the invention to provide a construction possessing the advantages noted.

It is a special object to provide a construction in which the rotating driving spindle for each of the bits includes a tool-holding element connected thereto adapted to contact an adjustable abutment carried by the spindle threadedly mounted axially of the spindle and provided at one end with a con tact face with the side face of the threads contacting the abutment facing towards the end contact face especially inclined and diverging away from the same whereby to increase its area of contact with the abutment, and preferably of greater area than the opposite side face of the thread.

It is also a special object to provide a construction in which the means rotatably driving the drill bits includes a rotatable spindle, a tool-carrying element and a limiting abutment both threadedly mounted upon a suitable part carried by the spindle, the side face of the thread contacting the abutment and facing towards the end thereof provided with the limiting contact face being espe cially inclined whereby the said sideface diverges radially from the axis of the spindle at a smaller angle than the opposite side face of said thread.

It is another special object to provide a construction in which the threaded connection between the adjustable abutment and driving spindle is such. as to generate under Serial No. 6,692.

the axial thrust of the tool-carrying ele ment a greater frictional resistance between the said abutment and the driving spindle to turning movementupon the spindle than that exerted between the contacting portions of the tool-carrying element and the said abutment.

It is still a further special object to provide a drill chuck having a tool-holding element and an adjustable limiting abutment both threadedly mounted upon a driving spindle so constructed or provided with means for reducing the friction between the contacting surfaces of the said element and abutment whereby the tendency of the turning movement of the tool-holding element to effect turning movement of the abutment will be reduced to a minimum.

These and other objects of the invention will more fully appear when taken in conjunction with the following description and the appended claims.

In the accompanying drawings forming a part of the application, Fig. 1 is a fragmentary perspective view of a portion of a multiple drill press equipped with the present invention; Fig. 2 a side elevation of one form of the invention, illustrating the rotatable driving spindle and the remaining portions forming the adjustable drill chuck on an enlarged scale; and Fig. 3 a similar view, shown partly in section and partly in elevation, illustrating a modified form of the invention.

In the drawings, 1 represents the frame of a multiple drill provided with the head 2, and the work table 3, all as common to machines of this same general character. The

.machine may be equipped with any desired number of chucks, each of which is rotatable and driven by means of a separate driving spindle through suitable gearing housed within the head 2 and the super-structure of the press. None of these parts, except in so far as subsequently described form a part of the present invention, and have therefore not been illustrated in greater detail, the showing in Fig. 1 being sufficient to those familiar with this art to clearly indicate the method of mounting the chucks and their coordination with the remaining parts.

In both forms of the invention illustrated, a rotatable drivingspindle t is provided for each of the bits 5, the usual tapered shank 5 of the bits being adapted to be received by a ssrrespondingly shaped. socket at one end fin ot a tool-holding or carryin element desig nated generally by the reference numeral 6, all as common in the art.

The element 6 is cylindrical in shape and provided with an axial internally threaded bore extending inwards from its end oppo site the bit-receiving socket which bore threadedly receives the terminal exteriorly threaded portion l of the driving spindle 4.

Also threadedly mounted upon the terminal of the driving spindle and in axial alignment with the tool-holding element 6 is a cylindrical abutment collar 7.

The portion of the terminal t which cooperates with the abutment collar 7, the in terior threads on the collar of course being correspondingly former, is equipped with peculiarly shaped threads in which the side tace 8 thereof facing the end contact taco on the tool-holding element is especially inclined away from the said contact "face. and diverges radially from the axis of the spindle in the direction of the head thereby increasing the area of the said side face over that or the opposite side taco of the thread. In other words, the side taco S is so snaped as to diverge radially from the axis of the spindle at a smaller angle than the opposite side tare oi the thread, bot-l1 races of course following the customary pitch of the thread as a whole.

Although this feature need not be extended to the portions of the threaded terminal a coacting only with the tool-holding element, for convenience in manufacture and manipulation the same form of. thread is used throughout the entire terminal portion of the spindle cooperating with both the tool-holding element 6 and the abutment collar 7.

To this point oi the description both embodiments of the invention, as illustrated in the drawings, are identically alike and the corresponding parts the-reot have been designated by the same reference numerals.

in the term shown in Fig. 2, the end face 9 of the tool-holding element adapted to directly abut in intimate contact the contiguous end contact face 10 ot the abutment, and for a purpose to be subsequently described more at length these end faces are highly polished. to produce plane smooth surfaces thereby reducing friction therebetween and the tendency of the one to turn in response to turning iovement of the other. To facilitate the manual adjustment, both these members may be knurled over apyn'opriate areas as indicated at 11 and 12.

The modification shown in Fig. 3 differs from that o1 Fig. 2 in that an antrlriction bearing; is interposed between the contiguous end faces of the tool-holding element 6 and the abutment collar 7. As illustrated, a ball bearing is employed comprising the ball retaining ring 13 having suitably spaced apert for receiving the anti-friction balls l Elwhich are adapted to contact and ride upon the end oi? the element 6 and the abutment 7, the diameter of the balls being preferably slightly greater than the thickness of their retaining ring, as l v y shown in the drawings. The intercie position oi this special anti-friction bearing; eliminates substantially all friction between the element (3 and the abutment 7 thereby practically obviating all tendency for the collar to turn upon the spindle due to rotation of the tool-holding element. Due to this tact, it has been found with this tor-n1 ot' the invention the specially inclined face 8 on the thread may be dispensed with and ordinary terms ot' threads employed instead.

The method of adjusting the gang of bits, preliminarily to the actual drilling operation, will now be descr'bed. The several tool-holding elements 6 are rotated ausing them to ride upon their spindles so as to brin the tips of all oi the bits 5 into exact alignment in which all of the tips will lie in the same plane or into any relative positions axially of the. spindle, as required by the character of the worl: being operated upon. W hen thus positioned the abutment collars 7 are rotated causing them to ride towards the tool-holding elements until brought into contact therewith, as shown in Fig. 2. or into contact with the anti-triction bearings as shown in Fig. 3.

Alternatively, the collars 7 may first be brought to the necessary positions upon the spindles and the tool-holding elements then rotateo to cause them to ride towards the abutment collars until a similar contact is established. The latter method cilitated by driving the spindles, as in the normal operation of the press, and permitting the tips of the bits to come into contact with the er face of the material to be drilled, in which event the elements (3 will ride upwardly on the spindles until the above dcscribed contact is made either directly with the collars h or until the anti-friction bear in, s strike the collars.

N 1th either method, as soon as intimate contact is made beti cen the parts, more ment of the tool-holding; elements axially ol' the spindle is immediately and positir arrested whereby to absolutely prevent furthe: riding of the raid elements upon the spindles, and assuring; the tips of the bits; being held in the relative positions desired and determined by the adjustments previously made.

lVith constructions such as illustrated, there is substantially no tendency tor the abutment collars to turn about the spindles under the influence of the power transmitted to the bits and their holding elements, which explains the positive setting effect and in the customary manner well known to those familiar with this art, but due to the smoothly polished plane surfaces provided on the end contact faces 9 and 10, in Fig. 2, the frictional resistance between them is sufficiently reduced to substantially elimi- 3 for the results desired, positively to the spindle. The binding effect between the abutment collar and the portion of the spindle upon which it is mounted is greatly enhanced by the provision of the inclined side face 8 of the thread which not only in creases the area of contact between the collar and the spindle but serves to generate an effective radial component resulting from the axial thrust of the tool-holding element upon the collar which aids in bringing the interior surface of the collar into a most intimate gripping relation with respect to the exterior surface of the spindle.

In the form shown in Fig. 3, the frictional contact between the element 6 and the collar 7 is practically totally eliminated due to the interposition of the anti-friction bearing therebetween. Consequently, substantially no turning moment whatever is transferred by the tool-holding element to the abutment collar, giving full effect to the axial thrust against the collar in producing the gripping action of the collar upon the spindle.

It is thus seen that the invention provides a drill chuck which is simple in construction, easy to manipulate, freely accessible, readily adjustable, and which will positively lock the tool-holding elements against displacement upon their spindles after the necessary preliminary adjustments have been made.

As required by the patent statutes, the preferred embodiment of the invention has been illustrated and described. It is obvious, however, that various changes in the details and in the arrangement of the several parts can be made without departing from thespirit of the invention. For instance,

the shapes of the driving spindle and the tool-holding element may be reversed, that is, the terminal of the driving spindle may be in the form of an internally threaded tube while the upper portion of the toolholding element is in the form of a solid rod exteriorly threaded to cooperate with the internal threads of the spindle, in which event the abutment collar will threadedly ride upon the threaded portion of the toolholding element, its upper end face serving as its contact face which abuts the end face of the spindle. The specially inclined face of the thread in this case, as in the previously described forms, face towards the end contact face of the abutment. It is therefore not intended to limit the inven tion beyond that particularly pointed out and defined by the appended claims.

I claim:

1. In a multipledrill press the combination with a plurality of driving spindles, of tool-holding elements threadedly connected to the spindles, a limiting abutment adjustable axially of the spindles threadedly mounted in axial alignment with the toolholding elements and provided at one end with a contact face, the side face of the thread engaging the said abutment and facing towards the said contact face being inclined and diverging away from the said contact face.

2. In a multiple drill press the combination with a plurality of driving spindles, of tool-holding elements threadedly connected to the spindles, a limiting abutment adjustable axially of the spindles threadedly mounted in axial alignment with th toolholding elements and provided at one end with a contact face, the side face of the thread engaging said abutment and facing towards the said contact face being inclined away from the contact face and having an area greater than the opposite side face of the threads.

3. In a multiple drill press the combination with a plurality of driving spindles, of tool-holding elements threadedly connected to the spindles, a limiting abutment adjustable axially of the spindles threadedly mounted in. axial alignment with the toolholding elements, the side face of the thread engaging the said abutment and facing toward the said contact face being inclined away from the contact face and diverging radially from the axis of the spindle at a smaller angle than the opposite side face thereof.

4. In a multiple drill press the combination with a plurality of driving spindles, of tool-holding elements threadedly connected to the spindles, a limiting abutment adjustable axially of the spindles threadedly mounted in axial alignment with the toolholding elements, the contact-portions of the said element and abutment being smoothly polished to form plane surfaces whereby to reduce the tendency of the one to turn in response to turning movement of the other.

In testimony whereof, I sign my name.

LABS H. VOLD.

Images