US2279089A - Metalworker's tool - Google Patents

Description

April,-7, 1942.

NI. c. HERGET METALWORKERS TOOL Filed April 2, 1941' 2 mm C MM Mw NEYS Patented Apr. 7, 1942 METALWORKERS TOOL Marvin C. Herge't, Williamsville, N. Y., assignor to Bell Aircraft Corporation, Buffalo, N; Y.

Application April 2, 1941, Serial No. 386,504

3Claims. .(01. 17-735) This invention relates to metal working tools and more particularly to a compact, self-contained metalworking tool designed for manual operation. r a

While analogous occur :to those skilled in the art concerned, I shall discuss the tool of my invention in connection with an arrangement of elements which adapts itself especially to the removal of annular burs which are ordinarily left around a drilled hole at the surface ofa work piece at the side thereof where the drill emerges from such work piece. Such burs are generally objectional for obvious reasons but they present a particular problem where a great many holes'are drilled;

as, for instance, in aircraft fabrication, and where it is subsequently intended to assemble work pieces by riveting through suchholes. Burs will then either prevent proper seating of the rivet head -or prevent intimate contact between -what should be abutting surfaces of adjacent sheets or blocks of material.

The device of the present invention is sufiiciently compact and portable and easy to use to I permit a workmanto have the tool at hand while accomplishing other related steps in the fabrication of metal parts, ready for quick and convenient use in the removal of burs as the occasion for such removal arises. The device of my invention is simple in construction and yet ade- 'quate and effective in accomplishing the desired purpose. The tool is of sufficiently small compass to permit convenient carrying thereof in a workmans pocket.

In the preferred form a bur-removing tool in the nature of a bit is arranged to be rotated by simple manipulative movement of the hand .of the workman and the design and construction of the tool is such that'the use of only one hand is required for complete operation thereof. In modified form my new tool may be arranged for operative rotation in one direction only, if desired. The design of my improved tool may be modified to provide interchangeability of bits.

-Practical examplesof devices embodyingthese' features are shown in the drawing and will hereinafter be described in detail.

Preferred forms of the new tool of my invention are illustrated in the accompanying drawing and the ensuing description. It is to be understood, however, that specific embodiments are set forth merely by Way of example and the principles of my invention are not to be consideredjas limited in their application, otherwise than as defined in -the appended claims.

uses of I theinstant tool willei whereby it may be conveniently secured against tionary manner.

welding, or the like. In the forms illustrated in and the spindle II.

In the drawing:

Fig. 1 is an elevational view of one form of bur-removing tool constructed in accordance with the principles of my invention and shown in operative relationship with respect to a previously drilled work piece;

Fig. 2 is a transverse cross-sectional'view on the line 22 of Fig. 1;

Fig. 3 is an enlarged cross-sectional view of the lower or bit portion of a modified form of the tool of my invention taken in a plane parallel with the axis thereof; and,

Fig. 4 is a transverse cross-sectional view taken on the line 44 of Fig. 3.

In the drawing and throughout the ensuing description like, characters of reference denote 'like parts and the numeral l0 designates a sleeve which is provided with an axial bore in which is journaled a stem or spindle II. The spindle ll extends from the opposite ends of the sleeve I0 and'at one such extending end it has secured thereto abur-removing bit 12, as by means of a pin I3 extending transversely through the bit In form, the bit I2 is similar to a conventional counter-sinking bit and 'has a fluted conical cutting portion whose angle may be selected to best suit the nature of the work in hand. A fiber thrust collar 14 is interposed between the end surface of the sleeve l0 and the adjacent radial face of the bit [2.

In Fig. 1 a work piece of metal, or the like, is designated A and such workpiece is shown as having a hole B which has previously been drilled. The bur which is'usually found at the side of the workpiece from which the drill bit emerges is indicated schematically at C. It is in the removal" of this bur that the improved tool of my invention is intended to be employed in the present instance.

Novel means are provided for conjointly handling and supporting my new tool and for producing rotation of the bit l2 upon proper manipulation of such handling and supporting means. To

this end the tool is provided with a pair of opposed handle members, one of which is relatively stationary and is designated generally l6 and the other of which is movably mounted and is designated generally IT. The handle member l6 has a securing portion l8 which is preferably elongate and of arcuate transverse cross-section the side wall of the sleeve in in a rigid and sta- Such securement may be by the drawing, the lower terminus of the securing portion I8 is annular and encircles the sleeve I as at I9.

The upper portion of the handle member I6 is through the body of the handle member I! shaped and formed to be conveniently grasped coming in contact with the drive means, and,, further, cooperates to provide aledge to more conveniently receive downward thrust of the hand of an operator than when mere friction of the hand against lied upon.

the handle portion 20 is remember IS.

The movable handle membenll. is provided with handle means 24 corresponding to and .00- operating with the handle portion 26 of the member I6. The handle member I! likewise has-an intermediate bulge 25 corresponding to,

and functioning in cooperation with the bulge 22 of. the handle member I6. The handle member I'I extends downwardly and terminates in a pair of trunnions 26 which are arranged for pivotal securement to the sleeve I0, preferablyadjacent the lower portion thereof, as by means of pivot pins 21. The transverse section of the lower portion of the handle member I'I-isarcuate, like that of: the portion I8 of the member I6, to correspond to the curvature of the outside of the sleeve ID. The trunnions 26 may be conveniently formed by merely providing. extensions in the nature of the ears at the lower longitudinal edges of such arcuate cross-section.

A drive pinion 30 is secured to the upper extension of the spindle II for rotation therewith and a rack bar 32 is supported at one end. by the pivotal handle member I! in such manner that pivotal movement of the handle member about the pivot pins 21 produces oscillation of the rack bar and consequent rotation of the spindle II bysvirtue of the engagement of the teeth of the rack bar 32 with the pinion 30. The

rack bar is preferably curved to approximately conform to an arc struck from the pivot pins 21 of the handle member I1 to form,'in effect, a

segment of a crown gear. It will be noted that substantial relative axial movement of the spindle II in the sleeve I0 is limited by cooperation between the pinion 30 and the work bit I2 secured,

respectively, to opposite ends of the spindle I I. For supporting and guiding the oscillation of the rack bar 32, and to unify and render more .and supports the latter against displacement from engagement with thepinion 30. The block 33 has a lateral extension 36 which is preferably shaped to conform to the inner surface of the handle member I6 adjacent the bulge 22, and is secured thereto by means 'of a screw 31, or the like. This construction very effectively braces the handle member IS with respect to the sleeve "III. a

' The end of the rack bar 32, which is operatively engaged to the pivotal handle member I'I, re-

ceives a screw 39 which preferably passes loosely" desired manner.

whereby the rack bar 32 may adjust itself to compensate for necessary angular deviations.

The handle members I6 and I! are normally held resiliently apart by a compression coil spring 40 whose opposite ends are guided by pins II and 42 secured, respectively, to the opposite handle members I6 and I1. In other words, the spring '40 serves .to urge the pivotal handle member I! in a counterclockwise direction about its pivot pins '21. Such pivotal movement of the handle 1 member I1 under the impetus of the spring 40 is limited by engagement of the lower edge of the handle member I1 against the upper radial face of the circular lower portion I9 of the handle Itis believed that operation of the device illustrated in Figs. 1 and 2 will be obvious from the foregoing description. The handle members I6 and I1 are grasped in the hand of the operator and, after the tool has been placed in-enga'gement of a, drilled hole, the handles are compressed'toward each other and, through the rack bar 32, the, pinionr3ll, thespindle II and the bit I2v are given a clockwise rotation aswiewed from above. This is the working or cutting stroke in the particular embodiment now being discussed. vIt is to be understood that the term cutting is used in this application as generic to cutting, milling, abrading, or otherwise removing portions of a piece of material.

Upon release of-the handle members 20 and '24. the spring 40 moves the parts to their initial position, as illustrated in Figs. 1 and 2. On this idle return stroke the tool may be left in engagement over an opening it morethan a single cutting stroke is required in the particular case.

In the embodiment illustrated in Figs. 3 and 4,

two variations of. the construction of Figs. 1

and 2 are incorporated. One of these is the provision of means for readily substituting and re placing cutting bits. The second of these variations is the provision of unidirectional drive means. It is to be understood that these two variations are independent and either of them may be incorporated in the basic device illustrated in the modification of Figs. 1 and 2 withoutthe other. In Fig. 3 the element designated 50 corresponds to the sleeve In of Figs. 1 and .2; the element 5| corresponds to the lowersleeve encircling portion I9 of the handle member I B; and the spindle 52 is like the spindle II, excepting for the difierences noted herein. In the embodiment of Fig. 3 a bit '53,. otherwise like the bit I2 of Figs. 1 and 2, has an upper annular flange 54 which is internally threaded to engage complementarythreads formed on a collar 55 which is disposed upon the spindle 52 adjacent its lower end and held in assembled position by means of a nut 56 which engages the lower terminal portion of the spindl 52, the latter being appropriately threaded therefor.

The upper face of the collar 55 engages against the lower end of the sleeve 50 and is provided with a cup-like depression having internal ratchet teeth 51 extending therearound.

The spindle 52 has rigidly associated therewith a pair of spaced trunnions 58 which receive therebetween a ratchet pawl 59. The trunnions 58 may .be formed integrally with the spindle 52 as shown or may be secured theretoin any A pin 60 is preferably provided to'pivotally support the pawl 59 with respect to the trunnions 58 and a leaf spring 8| may conveniently .be secured to the surface of the spindle 52 by means of a screw 62. The free end of the spring 6| bears against the pawl 59 in such manner as to urge its free terminal portion resiliently into engagement with the ratchet teeth 51.

From the foregoing it will be apparent that, in this form of the device, only clockwise movement of the spindle 52 will be operatively transmitted to the collar 55 and, consequently, to the bit 53. Counterclockwise return movement of the spindle 52 will be idle, and result only in the riding of the pawl 59 along the ratchet teeth 51.

The bit 53 of the embodiment of Figs. 3 and 4 may be removed and replaced by a bit of another form by merely unscrewing the bit from engagement with the collar 55. To this end the upper cylindrical face of the bit 53 may be knurled or provided with spanner holes, or the like, to facilitate disengagement, if desired.

It will be noted that in the forms illustrated all operative parts of the device, excepting of course the bit itself, are enclosed between the opposed handle elements and are entirely confined to the space directly. between such handle members. The contribution to safety in use and the protection afforded the working parts of the device by virtue of this construction are obvious. It will be noted that the sleeve In, the handle member [6, and the block 33 are rigidly assembled with respect to each other. The construction shown is extremely practical and economical but it will be noted that these elements might be integrally formed if manufacturing practice so indicated, without altering the other structural and functional features of the device. I

It will further be noted that the general configuration of the tool of my invention is such that its nose, adjacent the bit, may be inserted in restricted spaces, such as might be presented when holes to be operated upon are located in the bottoms of channels, or the like.

What is claimed is:

1. In a hand tool for metal workers, a supporting sleeve, a work shaft disposed therein and extending therefrom at opposite ends of said sleeve, a metal cutting bit carried by the extension of said shaft at one end of said sleeve for rotation with said shaft and a pinion secured to the extension of said shaft at the other end of said sleeve, a handle element rigidly associated with said sleeve and extending therefrom at the pinion end of said sleeve, a second handle element pivotally attached to said sleeve at a point spaced axially along said sleeve from said pinion, said second handle element extending toward and beyond said pinion to present a handle portion opposed to said first handle element, and a rack bar secured at one of its ends to said second handle element and extending therefrom into engagement with said pinion whereby the latter is rotated by pivotal movement of said second handle element to rotate the shaft and the cutting bit carried thereby.

2. In a hand tool for metal workers, an elongate supporting sleeve, 2. work shaft disposed therein and extending therefrom at opposite ends of said sleeve, a metal cutting bit carried by the extension of said shaft at one end of said sleeve for rotation with said shaft and a pinion secured to the extension of said shaft at the other end of said sleeve, a handle element rigidly associated with said sleeve and extending therefrom at the pinion end of said sleeve and in the general direction of extent of said sleeve, a second handle element pivotally attached to said sleeve adjacent the cutting bit end thereof, said second handle element extending beyond the pinion end of said sleeve to present a handle portion opposed to said first handle element, and a rack bar secured at one of its ends to said second handle element and extending therefrom into engagement with said pinion whereby the latter is rotated by pivotal movement of said second handle element to rotate the shaft and the cutting bit carried thereby.

3. In a hand tool for metal workers, a body member, a Work shaft disposed therein and extending therefrom at opposite ends of said body member, a metal cutting bit carried by said shaft at one end of said body member and a pinion secured to said shaft at the other end of said body member, a handle element rigidly associated with said body member and extending therefrom at the pinion end thereof in the general direction of extent of the axis of said work shaft, a second handle element pivotally attached to said body member at a point spaced axially from said pinion, saidsecond handle element extending beyond the pinion end of said body member to present a handle portion opposed to said first handle element, and a rack bar secured at one if its ends to said second handle element and extending therefrom into engagement with said pinion whereby the latter is rotated by pivotal movement of said second handle element to rotate the shaft and the cutting bit carried thereby, both of said handle members having outward lateral extensions in the region of said pinion to provide ledges for guarding the hand of the operator and for receiving downward thrust.

MARVIN C. HERGET.

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