US996955A - Chuck. - Google Patents

Description

`tional View o't' a UNITED STATES PATENT OFFICE.

VERNR JaWAHLSTROM, OF BROOKLYN, NEWYORK, ASSIGNOR OF ONE-II-IALF TO BERNHARD T. BURCHARDI, OF BROOKLYN, NEW YORK.

CHUCK.

Application filed October 14, 1910. Serial No. 586,989.

To all whom it may concern.'

Be it known that I, VERNER- J. WAHL- s'raoir, a citizen of the United States, residing at Brooklyn, County oi' Kings, and State of New York, have invented a new and use'- ful Improvement in Chucks, of which the following is a specication.

This invention relates to in chucks, and it has for' its main objects the production of a device of this general character of increased capacity and etticiency.

Vith these and other objects not specifically mentioned in view, the invention consists in certain constructions and combinations which will be hereinafter fully described and then specifically pointed out in the claims hereunto appended.

In 'the accompanying drawings which orm a part. of this specification and in which like characters of reference indicate the same parts, Figure l is a central secdevice constructed in accordance with the invention, Fig. 2 is a sectional view taken on the line 2-2 in Fig. 1, Figs. 3 and 4 are sectional views taken on the line 3 3 in Fig. l, showing they jaws in diit'erent positions, Figs. 5 and G are plan views oi one of the jaws showing the parts in diiferent positions, Fig. 7 is a sectional view taken on the line 7-7 in Fig. 5, and Fig. S is an end elevation of the jaw shown in Figs. 5, 6 and 7. i

In the device selected to illustrate the invention, there is provided a body 9 havii'ig three radial 4'slots 10 cutI through its wall to a central aperture 11 adapted to receive a tool shank. The body is further provided with a shank 12, driven or otherwise fastened in the body for the purpose of attaching the device to adrill press or other machine tool. The device is further provided with an annular shell 13 surrounding the body and rotatable thereon. This shell is provided withlthree internal cam faces 14, and is held in position by means of two caps 15, 16 screwed to the shell and engaging rabbets 17, 18 formed on the body 9. yA spring 19 is coiled around the body within the shell, one end being fast to the body and the other to the shell, as indicated in Fig. 1.

That portion of the device so far described is old and well known in the art, and a more detailed description of its construction is deemed unnecessary to a full understandan improvementing of the present invention, and is therefore omitted in the interest of brevity.

For the purpose of clamping a tool shank in the aperture 9, there is provided a jaw, or a plurality of jaws, working in the slot 10. Thisjaw, or these aws, may vary within wide limits. As shown, however, what may be termed rocking jaws are employed. Each of these jaws, marked 20, is provided at its outer end with a hook 21 which is in engagement with a ledge 22 formed in one wall of each of the slots 10. By reference to Figs.` 3 and 4, it wllbe readily understood that the hooked. end of the jaws are wider than the slots in which the jaws Awork, and that the ledge 22 lies in a vplane which does not intersect the axis of the body 9. When the shell 13 is rotated by the spring 19, the internal cam faces 14 slide by the outer end of the jaws 2O and tend to force them inward toward the axis of the chuck. The hooked end 21 of the jaws in Contact with the ledge 22 prevents one side of the jaws from traveling inward as fast as the other.4 The et'ective result of this is a rocking movementfof the jaw which serves to translate a small movement, initially set up by the internal canrfaces, into a relatively large n'nivement of the jaws toward the axis of the chuck. This can be best understood by an inspection of Figs. 3 and 4. In Fig. 3, the'jaws are shown in wide open position. In Fig. 4, they are shown in their innermost position. It will be readily understoodthat they can only reach the latter position by heilig rocked a1id-1noved inward by the rocking movement. l

Vhile in certain constructions, the jaws alone might be relied upon to clamp thetool shank by direct contact; in the best constructions and as shown, a tool gripper carried by the jaw is en'iployed. This gripper, marked 2G, is a segmental rocking gripper and is seated in a recess 23 formed on the inner end of the jaw 20, as clearly shown in Figs. 3 and 4.. It is provided with lingers' 27 which interlock with fingers 2S on the .jaw 20. The bearing face 29of eac-h gripper is cam shaped so that the grippers are, by contactA with a tool shank, caused to tightly clamp a tool shank in the aperture 11 in a well known manner. The upper and lower ends' of the jaws are provided with segmental channels 30 concentric with Patented July 4, 1911.

t ployed. One end 'of this spring is secured Figs. 5 and in the jaw and the other in the gripper,

,IVhen a. plurality of jaws and grippers are employed, each gripper is provided with an upwardly projecting stud 34 which engages oneof the 4slots 35 cut in the lower face of a plate 36 centrally located in the upper part of the aperture 11.

lhe mechanism just described serves' to control the rocking movement of the several gripper/s and insure uniform movement of the same so that a tool shank will always be Ycentrally clamped in the aperture.

In view of the foregoing,'a detailed description of the 'operation of the device is -*eemed unnecessary and is therefore omitt d in the interest of brevity.

Y Changes and variations may be made in the structure by means of which the inventionis carried into effect. The invention, therefore,l isnot to be restricted to the precise details of the structure shown and described.

IVhat'iis claimed is:

l. In a chuck, the combination with a body -having a slot, of an annular shell surroundingtlie body and having an internal cam face, a aw mounted and shaped to turn `within the slot the outer end of said jaw lying in the path of the cam face, and means for limiting the movement of one side of the jaw/to cause it to turn within the slot'. y v2. I nfa chuck, the combination with a body 'having a slot., of an annular shell sur-- rounding the bodyand having an internal. cairrface, a )aw mounted and shaped toygturnI withinv the slot and 'having at its outer end a hook wider than'thc slot and lying in the path of the cam face,;and means in the path of the hook to limit its movementwhereby i the jaw is caused to turn in the slot.

In a chuck, the combinationwith a body'liaif'ingia slot, of an annular shell sur- `rounding the body and having an internal cam face, a jaw mounted and shaped to turn within the slot and having at'its outer end an integral hook wider thang the slot and llying in the path'of the cam face, and means in the path of the hook to limit its .movement whereby the jaw is caused tof burnin the slot.

4. In a chuck, the combination with a body having a slot, of an annular shell surrounding tlie body and having an internal cam face, a jaw mounted and shaped to turn within the slotand having at its outer end an integral hook wider than the slot and lying in the path of the cam face, and means at one side of the slotand in the rounding rthe body and-having an internal y ath of4 the hook to limit the movementfof t ie hokvcam face, a jaw mounted andi shaped to turn wtliin the slot and havino at its outer end an integral hook wider tIian the slot and lying in the pat-h of the cam face, and a ledge at one side of the slot and in. the path of the hook to limit the movementl of the hook whereby the jaw is caused to turn in4 having an internal cam face, a jaw working in the slot and having atits outer end a hook widerthan the slot/ and lying inthe path of the cam face /witli its end in engagement with the ledgefa/rl otally carried by the jw;r

7..In a chuck, tli @combination witlia' body having a 1-ad"/il/slot provided a one side with a ledge wider than the slot and lying in a plane tha/t does not intersect `the a-tool gripper pivaxis ofthe body, o/tan annular shell surrounding the body and having an internal cani' face, a Jaw working inthe slot andhaving at its outer end a hook wider/thun the slot' and lying in tl'ie path/fof the cam face l with' its end in engagement 'with the ledge,

and a tool gripper/Pivotally carriedby'the hei'eoffI have signed my naine tt'itliLi/s'specification in thel presence of two subsril'iing witnesses.

. Witnesses: o

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