US1956904A - Apparatus for positioning structural members for drilling and like operations - Google Patents

Description

May 1, 1934- H. H. MCcLlNTlc 1,956,904

APPARATUS FOR POSITIONING STRUCTURAL MEMBERS FOR DRILLING AND LIKE OPERATIONS Filed Deo. ll, 1931 2 Sheets-Sheet l May l, 1934- H. H. MocLlNTlc APPARATUS FOR POSITIONING STRUCTURAL MEMBERS FOR DRILLING AND LIKE OPERATIONS Filed Deo. 2 Sheets-Sheet 2 INVENToR.

BY ATTORNEY iatented May l, i934 APPARATUS FOR POSITINNG- STRUC- TUR/FAL MEIVEBERS FR DRLMING AND LIKE @PERATENS Howard H. McClintic, TPittsburgh, lla., assigner to McClintic-li/larshall Corporation, a corporation oi Eennsylvania Application December 11, 1931, Serial No. 580,310

9 Claims.

rIhis invention relates to an apparatus for centering, holding and turning structural members to permit drilling, punching, riveting, or like operations thereon, and the present invention is particularly directed to the chuck mechanism employed in such apparatus, and constitutes a continuation in part of my application Serial #282,143, iiled June i, 1928.

The prime object oi the present invention is 10 to provide new and improved work engaging chucks especially designed for cooperating work with the head and tail stocks of apparatus disclosed in my aioresaid application.

1n the accompanying drawings, which illustrate applications of my invention:

Fig. 1 is a side elevational view particularly showing a head stock with my improved workengaging chuck incorporated therewith, the view also showing a portion of the centering apparatus shown in my aforesaid application;

Fig. 2, a face view of the work-engaging chuck mechanism taken on line 11-11 of Fig. 1; and

Figs. 3 and 4, views similar to Fig. 2, showing modiiied forms of chuck mechanisms embodying my invention.

Fig. 5 is a sectional elevation of the mechanism for locking the drum to the headstock as shown in Fig. 1.

Referring form of Fig.

or movable supporting body including a side member 11. The bed 1G is adapted to be mounted for longitudinal movement upon a series of rollers, not shown.

1n practice, a head stock and a tail stock are movably mounted on carriages slidable along the bed lil. In the present application, I have shown only the head stock designated generally by the numeral l2, mounted on a carriage 13. Headstock l2 has a bracket 14 secured thereto, said bracket being designed to journal a shaft 15 adapted to be turned through the operation ci a hand wheel. Keyed to shaft 15 is a pinion or gear wheel 16 designed to mesh' with a gear wheel 17 rigid in a short shaft 18, journaled in bracket 14. 18 also has a pinion or gear wheel 19 keyed thereto. Gear 19 is adapted to mesh with rack teeth 20 or" a side member l1. 21 designates the hand wheel for operating shaft 15 whereby the carriage and its head-stock may be moved longitudinally of the bed.

Journaled in the body 22 or" the carriage 13 adjacent the upper portion thereoi, is a shaft of spindle 23 having a head or plate 24 to which a drum 25 is secured by bolts 26. rEhe drum 25 to the drawings, and iirst to the 1 10 designates a portion of a bed extends between the inner end of the body 22 and a vertical wall 27 integral therewith, which wall mounts short shafts 28 on which rollers 29 are iournaled and arranged in contact with the periphery of the drum 25 so as to assist in sustaining the weight and strain imposed thereon, especially under the exceedingly heavy work in connection with which the chuck is used.

Said drum 25 constitutes the base of the chuck proper, and carries a diametric block 30 provided with a centered longitudinal T-shaped slot 31 extending completely therethrough. T-shaped studs 32 occupy and are slidably mounted in said slot 31. An adjusting screw 33 is centrally journaled, as at 34,- in the block 3i), and on the opposite sides of its journal 34 is provided with opposite screw threads 35 and 36, one half of said threaded portions being received in a semi-circular recess 36a of the block 30. The studs 32 rest on the threads 35 and 36 and have corresponding threads meshing therewith, so that, according to the direction of rotation of the screw 33, the studs S2 will be moved closer together or farther apart. To permit rotation of said screw 33, it is provided with square sockets 37 to accommodate a key or turning tool.

The journal or bearing portion 34 may be engaged by a retaining strip 38 detachably screwed or otherwise secured to the block 30, as at 39. A bolt or pivot member 40 is secured on the outer end of each stud 32 with its axis at right angles to the line or movement of the studs, and has two jaws or gripper members 4l pivoted thereon, said members being reduced at their overlapping portions so that the upper and lower faces of the remainder thereoi will be in the same plane. Jaws 41 are retained on the pivot members 40 by washers 40a and cap screws 40o.

In order to prevent collapse or displacement of the jaws 41 when not engaged with work, and particularly when moving relatively thereto, each upper jaw 41 has a generally arcuate spring 43 fastened thereto at 44 and which partially surrounds and resiliently supports the lower jaw 41 from below. 1n addition, fixed lugs or stops 45 are provided on the blocks 32 which preclude lowering movement of the upper jaws 41. It will accordingly be seen, that when the shaft 33 is turned in one direction, the threads 35 and 36 will move the studs 32 toward each other, so that the free ends of the jaws 41 will be moved toward each other and into engagement with the work. Thus, in the form of Fig. 2, the jaws 41 will spread and engage in the interior corners of the l-l-shaped beam or work W, thus centering lli.)

and tightly gripping and holding it. In order to release the work, said shaft 33 is turned in the opposite direction, so that the jaws will be moved away from and out of engagement with the work, thereby causing relative contraction of the jaws.

A similar drum and chuck may be employed in conjunction with the usual form of tail stock, not shown, and are always free for rotation to accommodate adjustment of the work. The drum and chuck of the head stock however, are adapted to be securely locked and held in different positions according to the particular drilling or operations to which the work is to be subjected. In this connection, the H-beam W may be moved to occupy four different positions with respect to a drilling tool or other apparatus for working on the beam, and therefore, four locking recesses 47 are provided in the drum 25 of the head stock.

Adapted to enter said recesses 47 is a bolt or rod 48 which is slidably mounted in suitable bearings 49 on the head stock body 22. Secured to the bolt 48 at 50 are spaced collars 51 and 52. An expansive coil spring 53 is positioned on shaft 48, between collar 51 and a bearing 49, towards the projection of bolt 48 so that it will automatically enter one of the recesses 47 when brought into register therewith.

A retracting lever to move bolt 48 out of the recesses 47 is provided at 54, such lever having a yoke 55 engaging the bolt 48 between the collars 51 and 52, and having one of its arms 56 extended and pivotally bolted or otherwise fastened,

. as at 57, to an angle bracket 58 secured to the head stock body 22.

In addition, the spindle 23 of the head stock has a worm wheel 60 keyed to its outer end and which is in mesh with a worm 6'1 located at the top thereof. Worm 61 has a hand wheel 52 secured thereto. Said worm wheel 60 and worm 6l are housed within and protected by a suitable sectional casing 63 fastened to the head stock body 22. Through the turning of the hand wheel 62 and intermeshing of gears 6l and 60, when bolt 48 is retracted, the spindle 23 of the head stock may be turned so as to correspondingly turn its chuck, the work held thereby, and the chuck and spindle of a tail stop.

3 illustrates a modified forni of my invention. In this form the chuck is particularly adapted to grip and secure a channel member C for drilling and like operations. As illustrated, one of the studs 32 mounts a backing member or abutment 64 by means of its pivot 40, said abutment member having a flat face 65 thereon for engaging the back of the web of the channel member.

The other stud 32 is provided with jaws 41 as before, for engagement in the angles between the iianges and web of the channel C. Rotation of the screw 33 in the proper direction will move the studs 32 toward each other to firmly clamp and retain the channel between the jaws 41 and the abutment 64. i

A further modification is shown in Fig. 4, wherein two spaced-apart members or abutments 66 are securely fastened to the drum 25 by means of suitable screws or bolts 67. Said abutments are provided with flat faces 68 disposed in parallelism for Contact by angle members A. The two pairs of jaws 41 are employed as before, and engage the angles between the iianges of the members A as shown, to securely clamp said members a minst the faces 68 of the members 66. In

this manner, four angle members A may be held for drilling, riveting, etc. at one operation.

Thus it will be seen, that by means of my invention, various shapes and sizes of structural members may be readily centered and clamped by the chuck, and by the rotation thereof, be readily brought into working position to enable drilling, riveting, etc. on any side or face of said structural members.

I claim:

1. A chuck of the character described, com-- prising relatively movable mounting elements, a pair of jaws pivoted to each element, means preventing displacement of one of the jaws or" each element when disengaged from the work, and arcuate spring members extending from the last mentioned jaws and engaging the remaining jaws to prevent displacement of the latter when disengaged from the work.

2. A chuck of the character described, comprising a block, relatively movable members onl said block, pairs of jaws pivoted at right angles to the line of movement of said members, elements preventing displacement of one of each of said pairs of jaws when disengaged from the work, and elements embracing each pair or" jaws for preventing displacement of the remaining jaws when disengaged from the work.

3. A chuck of the character described, comprising a rotatable member, relatively movable mounting elements thereon, a pair of jaws pivoted to each element, means preventing displacement of one of the jaws of each element when disengaged from the work, and arcuate spring members extending from the last mentioned jaws and engaging the remaining jaws to prevent displacement of the latter when disengaged from the work.

4. A chuck of the character described, comprising a rotatable drum, a diametric block on the drum, relatively movable mounting elements on said block, a pair of jaws pivoted to each element, means preventing displacement of one of the jaws of each element when disengaged from the work, and arcuate spring members exf,

tending from the last mentioned jaws and engaging the remaining jaws to prevent displacement of the latter when disengaged from the work.

5. A chuck of the character described, comprising a rotatable drum, a diametric block on the drum having a T-slot therein, T-shaped studs in said slot, means engaging said studs for imparting relative movement thereto, work-engaging means mounted on the studs, one of said means including separate members forming a pair of jaws pivoted to a stud at their meeting ends, the free ends of said jaws being capable of expansion relative to each other when engaging the work,

means to contract the jaws, and means for pre-` venting displacement of the jaws when disengaged from the work.

6. A chuck of the character described, comprising a rotatable member, relatively movable elements thereon, means for imparting relative placement of the jaws when said jaws are disengaged from the work,

7. A chuck of the character described including a rotatable member, relatively movable mounting elements, a block support for the mounting elements, screw actuating means oooperating with said elements and block, separate work engaging jaws hinged at one end carried by the mounting elements, said jaws being capable of relative expansion when their free ends are pressed against the work by the movement of the screw actuated mounting elements.

8. A chuck of the character described including a rotatable member, relatively movable mounting elements, a block support for the mounting elements, screw actuating means cooperating with said elements and block, work engaging means carried by the mounting elements, said work engaging means comprising separate members arranged to form a pair of jaws pivoted at their fixed ends to one of said mounting elements, and an abutment member carried by the other mounting element.

9. A chuck of the character described including a rotatable member, relatively movable mounting elements, a block support for the mounting elements, screw actuating means cooperating with said elements and block, work engaging means carried by the mounting elements, said work engaging means comprising separate members arranged to form a pair of jaws pivoted at their Xed ends to one of said mounting elements, the free ends of said jaws being capable of relative expansion or contraction when engaging or disengaging the work respectively, means to contract the jaws, an abutment member carried by the other mounting element, and means for preventing the displacement of said jaws and abutment when disengaged from the work.

HOWARD H. MCCLINTIC.

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