US2788810A - Woodworking attachment for drill motors - Google Patents

Description

April 16, 1957 c. E. JONES WOODWORKING ATTACHMENT FOR DRILL MOTORS Filed Oct. 17, 1955 2 Sheets-Sheet l cHALQLEs 5-. JONES INVENTOR.

ATTORN EY April 16, 1957 c. E. JONES 2,788,810

WOODWORKING ATTACHMENT FOR DRILL MOTORS Filed Oct. 17, 1955 2 Sheets-Sheet 2 Mates 2. m

IN VEN TOR.

ATTORNE United States Patent WOODWORKING ATTACHMENT FOR DRILL MOTORS Charles E. Jones, Longton, Kans.

Application October 17, 1955, Serial No. 540,662

3 Claims. (Cl. 143-43) This invention relates to woodworking tools and pertains more particularly to an attachment or device capable of being driven by an ordinary drill motor in the performance of a plurality of different carpentry operations.

Various attachments have been devised for use with drill motors and the majority of these attachments, once they have been adjusted, function fairly well as far as their specific or single purpose is concerned. However, there remains a need for a more versatile attachment of a multi-purpose character which will permit its use wherever a number of commonly required work functions are to be effected. For example, the invention envisages the achievement of sawing, planing and sanding operations with a single basic attachment, only replacement of the particular tool mechanism supported by the frame of the attachment having to be made where particular circumstances dictate.

Not only has the invention the object of providing a universal attachment as outlined above, but it has for an added object the facile adjustment of the respective tools as to their bite without resort to expensive and complicated mechanisms. In this regard, it is to be also pointed out that another aim of the invention is to provide a lightweight attachment of a portable nature which will be rugged and long lasting.

A further object of the invention is to provide an attachment of the foregoing character in which the various possible adjustments are maintained fast once they have been made, even when the attachment is subjected to considerable vibration.

Also, the invention comprehends a quick shifting of the handle grip through 180 degrees from opposite location to the other, thereby making it possible for the attachment to be operated from either end, depending upon which end is more convenient at that particular moment.

Other objects will be in part obvious and in part pointed out more in detail hereinafter. v

The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereafter set forth and the scope of the application which will be indicated in the appended claims.

In the drawings:

Figure 1 is a top plan view of the attachment illustrating the invention;

Figure 2 is a side elevational view of the attachment;

Figure 3 is an end view of the attachment when seen from the right;

Figure 4 is a sectional view taken in the direction of line 4-4 of Figure 2;

Figure 5 is a sectional view taken in the direction of line 5-5 of Figure 1.

Referring to Figures 1-5 the attachment there shown comprises a base plate having a transverse slot 12 and a longitudinal slot 14. Integral with the base plate 10 is an upstanding side wall 16 provided with a cylindrical aperture 18 (Figure 5) extending transversely therethrough. For the purpose of strengthening the other scribed is intended for sawing operations.

side of the base plate 10 a U-shaped rod 20 has its ends anchored to portions of the plate on either side of the slot 12. Rod 20 also serves as a guard.

The aperture 18 accommodates in the present instance a saw mechanism or sub-assembly 22 which includes a cylindrical barrel 24 (Figs. 3, 4 and 5) capable of being inserted into the aperture 18. Within the barrel 24 is eccentrically journaled a shaft 26, the shaft being supported by flanged sleeve bearings 28, 29 disposed at either end of a bore 30 extending completely through the barrel. A projecting spindle end 32, actually a reduced diameter portion of the shaft 26, serves as a means by which the shaft may be rotatively connected to the chuck of a conventional drill motor (not shown).

As may be seen from the sectional make-up pictured in Figure 4, there is a pair of cup-shaped washer elements 34, 36 circumscribed about the spindle 32. The element 34 is prevented from moving toward the left by a lock member 38 received in an annular groove formed on the spindle 32. Interposed between the two washers 34, 36 is a coil spring 40 which exerts a pressural action against the washer 36 and hence the flange of the left bearing 28, the washer 34 absorbing the spring reaction and thus causing a flange 42 at the other end of the shaft 26 to bear against the flange of the right bearing 29 (Figure 4). In this way the shaft 26 is prevented from shifting axially when rotating owing to the thrust bearing arrangement above described.

As already explained, the mechanism now being de- Accordingly, a disc type saw member 44 is mounted on the shaft 26 for rotation therewith, there being a screw 46 threaded into the shaft for this purpose. As indicated in phantom outline at 48, the saw disc is susceptible'to being of Whatever diameter is found necessary for agiven sawing job. Also, while saw discs of various diameters may be substituted one for the other merely by removing the screw 46, nonetheless provision is made for facile adjustment of the depth of cut by simply turning the barrel 24 relative to its aperture 18. To this end, it will be observed from Figure 5 that the bore 30 extending through the barrel 24 is oflfset from the barrels centerline. By reason of this eccentricity, the saw disc 44 can be moved relative to the base plate 10 and the depth of its out accordingly governed.

Attention is now directed to the unique handle construction presented by the invention and the role it plays in assuring that the barrel 24 will remain in whatever preferred angular condition into which it is turned. As best seen in Figure 5, the handle assembly includes a shank 50 received in a longitudinal aperture 52 formed in the side Wall 16. The shank is of sufficient length so that both ends thereof project from the side Wall 16, there being an indentation or recess 54 in each exposed portion. Either indentation 54 may be employed for the attachment of a handle grip unit 56 comprising a grip 58, a grip shank 60, a tubular bushing 62 aflixed to the shank 60 by a pin 64 (Figure 5) and a thumb or set screw 66 threaded radially into the bushing 62. The bushing 62 is so dimensioned that it slips readily over either end of the shank 5i and tightening of the thumb screw into a recess 54 secures the two shanks 50 and 60 together so that the entire attachment may be easily maneuvered through desired work performing paths.

The shank 50 is precluded from twisting Within its aperture 52, and hence with respect to the other parts of the attachment, by reason of a diametrically extending aperture 68 through which extends another thumb or set screw 70. There is a vertically directed aperture 72 in the side wall 16 having a larger diameter than the screw 70 so that there can be complete freedom of movement therebetween, thereby permitting the thumb screw td be-advancedsolelyby the'action of the threads contained-intheaperture 68: Theaperturends-of sufficientlength so that the lower extremity of the screw 70 can' abut a portionof the barrel 24. Thus, a dual function iefieetedi the shanl 50 is prevented" from: turning and the barrel 24 s held fast Near the upper end of the thuni'b'sc'rew70 'is" a" collar Mane-a; washers/earth a coil spring78-intrp0sed thereuetwe'e The Washer'76 thus resilientlybears against afyersly bent wire element'StY-haVing'a'pair of parallel spaced regs-s2, the ends of which are anchored to 'a shield 8'4 as by rivets 86 (Fig; 3)"; The shield 84, to-

enie: W'ith'tlie Wire" 80',- fo'rihsan ei'r'ective guard capable of overhanging the saw 44* to'whatever extent that is desired by tlieusr' of the device; the resiliency imparted V bY-fthe'spring 78-pe'rfiiitt-ing facile slidingof the wire 83 relative-to the s'ide wall 16. Accordingly, it will be discerned that thet-humh'scre'w 76 performs 'yet another t'unction;

In order to'gu'ide' the-entire attachmentin a rectilinear patha-downwardly projecting flange 88 (Figs; 2 and 3) isp'rov'ided onthe' underside of the base plate 19. At one end o'f'the flange is an upstanding fixed post 90 having a notch en'gageable with one beveled'en'd of the base plate, whereas an upstanding threaded stud 92 is aflixed to the other'end. By'means ofa notched bushing 94'and atwing nut'96" the other beveledend of the base plate is releasably engaged. Simply loosening the Wing nut 96 permits struct'ion and many apparently Widely difierent embodiments of'thefl invention could be made without departing from the scope thereof, it is intended that allmatter contained in the above description or shown in the accompa'nying drawings shall be interpreted as illustrative and not-in a'lirfniting' sense.

It is also to be under sto'od that the language us'ed'in the following claims is intended to, cover all of the generic and specific features of the invention herein described and'all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween What is claimedz' y 1'. Ina woodworking attachment for drill motors, a base plate, anupstanding side wall on said base plate having a first cylindrical aperture extending transversely therethrough; a second aperture" extending longitudinally therethrough at an elevation displaced from said first aperture and a third apertufe extending vertically in an inters cting relation with said first and second apertures,

ical barrel received in said first aperture, a handle a cyli Jr shank received in said second aperture having a threaded aperture registrable with said'thir'd'ape ture, a set screw threadedly receivedby'saidjthreadedaperture} said screw extending through saids'econd aperture into engagement with said barrel, a shaft journaled for rotation within said barrel on an a'xis'ofiset from" the centerline of said barrel, and a rotatableqwoodworking'tool carried by s'aid shaft for rotation therewith, whereby angular adjustment of said barrel Within said'first aperture determines the position of said tool relative to said base plate, and tightening of said set screw maintains such adjustment 2. The structure set forth in claim l in which the handle shankprojects from both e'nds jof saidsidewa'll, a handle grip'e'quipped'w'ith a bushing adapted to 'telescope over either end of said handle'shanlt, said bushings;

having a threaded aperture extending radially inwardly, and a set screw'threadedly' received by said last named aperture for retaining saidhandlegrip in a fixed relation with respect to either end of saidshank;

a. The structure Barons inn'aim 1 in which said first named set screw is provided with a collar, a washer'el-' men't circumscribing' said set screw, a coil spring inter-' posed between said" collar and Washer element, and a guard element for overlying the woodworking tool, said guard eiernent having a'pair of spaced parallel legs dis posed in" transverse grooves atop said side wall with said Washer element yieldingly bearing against said legs so as to retain frictionally the guard elementin a preferred position. 7

References- Cited in-thefile of this patent UNITED STATES PATENTS i

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