US2214584A - Nibbling attachment for drill presses - Google Patents

Description

Sept. 10, 1940. Q HEYDENBURG 2,214,584

NIBBLING ATTACHMENT FOR DRILL`PRESSES Filed Sept. 5. 1938 2 Sheets-Sheet l www* ATToe/vey Patented Sept. 10, 1940 UNITED STATES NIBBLING ATTACHMENT FOR.` DRILL PRESSES Clair W. Heydenburg, Los Angeles, Calif. Application September 3, 1938, Serial No. 228,412

. 1 Claim.

This invention relates generally to power tools, and more particularly to drill presses.

An object of the invention is to provide a nibbling device particularly adapted, although i not necessarily for use in conjunction with a power drill press, by utilizing the latter as a support and as a driving means, all in such manner that the device will not require `any means to fasten it in place and will not subject the drill l press spindle to any destructive forces or premature wear, yet will enable the device to rapidly and accurately nibble away the edge of sheet metal or other material as fed to the nibbling punch of the device by an operator, whereby to 1-3 eliminate a separate and costly nibbling machine requiring large floor area and, therefore, not available for relatively small machine shops.

Another object of the invention is to provide a nibbling device of the above described character So having means by which it can be readily adjusted to compensate for wearing away of the nibbling punch and for internal nibbling operations, as well as enabling the nibbling punch to be rotatively adjusted in order that work can be fed to s the punch from various directions.

A further object of the invention is to provide a nibbling device which is relatively inexpensive, extremely compact so as to render it conveniently portable, and which can be applied to and re- .'o moved from a drill press with the utmost ease and dispatch.

With these and other objects in view, the invention resides in the combinations, arrangements and functional relationships of elements as set forth in the following speciiication, and

particularly pointed out in the appended claim.

In the accompanying drawings,

Figure 1 is a view in side elevation, and showing the nibbl'ing device embodying this invention 40 applied to a drill press;

Figure 2 is a horizontal sectional View taken on the line 2-2 of Figure 1;

Figure 3 is an enlarged vertical longitudinal sectional view of the nibbling device, taken on 45 the line 3 3 of Figure 2, and showing the nibbling punch in its upper extreme position;

Figure 4 is a sectional view similar to Figure 3 and showing the nibbling punch in its lower extreme position.

50 Referring specifically to the drawings, the invention comprises a support Ill including a rectangular base portion Il having a work plate I2 and feet I3 at its corners on which the support can be rested upon the table T of a drill press P.

55 From the base portion ll projects an overhangving arm I 4, the free end of which is provided withv an opening I5 therethrough, slidably receiving a mounting sleeve I6 externally threaded at I'I and Ila to receive nuts E8 and I9 adapted to co-act H with opposite sides ofthe arm in clamping the 5l sleeve thereto in' various axially and rotatively adjusted positions for a purpose to be later described.

Mountedv in the cylindrical bore 2Q of the y I mounting sleeve I3 is a punch holder 2| confined 10 to reciprocating motion in the sleeve by means of a pin 22 threaded into the holder and working in a longitudinal slot 23 in the sleeve. The upper end of the holder is of a diameter to provide a A working fit in the bore 20, whereas the remaini5' der Voi the holder is of reduced diameter to provide an annular space between the holder and sleeve for a coil spring 24 which abuts the lower end wall 25 of the sleeve and the enlarged upper end of the holder for co-action therewith in urging the holder upwardly.

The lower end of the holder is guided by and projects through an opening in the end wall and is provided with a socket 26 receiving a nibbling punch 2l secured in place by a set screw 25 28. During reciprocating motion of the holder 2 I, the punch 21 co-acts with a die 23 secured by a set screw 30 in a socket 3l provided in the base portion Il in co-axial relationship to the axis of the holder and mounting sleeve. 30

The upper end face of the holder 2l is formed to provide a cam 32 with which is adapted to co-act a complementary cam 33 formed on the lower end face of a stub shaft 34 rotatably mounted in a plain bearing 35 supported by a cap 35 36 threaded at 31 into the upper end of the mounting sleeve I6, A ball thrust bearing 38 is interposed between the shaft and cap, and nuts 39 and 40 are threaded on the shaft at 4I for coaction with the bearing 38 in confining the shaft 40 against axial displacement.

The upper end of the shaft 34 is reduced in diameter to form a shank 42 adapted to be received and clamped in the chuck C of the drill press P when the support IIJ is resting on the 45 table T of the press as is shown in Figure 1, whereby to provide a detachable driving connection by which the shaft 34 will be driven by the spindle S journaled in the head H of the drill press.

The support I0 is provided with a boss 43 in which is screwed a rod 44 having a sleeve 45 of elastic rubber and forming an arm of sufcient length to engage the column K of the drill press for co-action therewith in preventing rotation of 5,.

the support I0 on the table T during the operation of the invention, which is as follows:

With the support Il] resting on the table T andv wherein the nibbling edge or shoulder 27d of the punch 27 clears the platen l2 sufliciently for the insertion of the metal to be worked upon between the punch and platen. v

As rotation of the shaft 3d is effected, the camsl 32 and 33 co-act to force the holder 2l axially downward against the action of the spring 24, to the other extreme position shown in Figure 4, wherein the nibbling edge 2id of the punch 21 enters the die 29. It will thus be clear that by manually feeding a sheet of metal on the platen l2, and properly manipulating the edge of the metal with respect to the punch 2", the latter will nibble away the edge so that the edge can be given any contour desired.

By loosening the nuts i8 and I5, the mounting sleeve l5 can be raised or lowered to vary the working position of the punch 2l' vertically with respect to the platen l2 so as to compensate for wearing away of the nibbling edge 27a aswell as to dispose such edge at the position most effective in nibbling metal of a particular thickness. By this arrangement, the mounting sleeve can also be raised sufficiently to clear the punch .2l from the platen in order to permit a sheet of metal to be inserted beneath the punch for internal nibbling. Likewise the mounting sleeve can also be rotatively adjusted to vary the circumferential position of the nibbling edge, and thus permit the Yin drilling operations.

work to be fed to and acted upon by the punch from various directions, whereby to accommodate sheets of various proportions and contours.

It will be noted that as ther nibbling device merely rests upon the table T and is entirely free of any direct attachment thereto by a rigid or extraneous fastening means, no destructive forces incident to the driving of the shaft 34 by the spindle S will be set up in the latter, and thatthe spindle will be subjected only to the usual torque and end thrust as are' imposed thereon The functioning of the arm 44 does not affect this condition, as the arm merely prevents rotation of the device Von the table T, under the rotative tendency of the shaft 34.

AWhat is claimed is:

A nibbling device comprising a support having a die; a mounting sleeve axially and rotatively adjustable'in the support and co-axiallyrelated to said die; nuts on the sleeve co-actable with the support to secure the sleeve in a selected position of adjustment; a punch holder mounted in the bore of the sleeve; a nibbling punch carried by the holder and co-actable with the die; means for confining said holder to reciprocating motion axially in the sleeve; a cam on an end face of said holder; a shaft journaled in said holder and having a cam on an end face thereof co-actable with the cam of the holder to move the latter to one extreme position in response to rotation of the shaft; a spring in the sleeve co-acting with the holder to urge the lat'ter to its other extreme position; a shank on said shaft adapted to be clamped in the chuck of a drill press when the support is disposed on the table of the press; and an arm on the support adapted to engage the column of the drill press to prevent rotation of the support.

CLAIR W. HEYDENBURG.

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