US893348A - Drill-chuck. - Google Patents

Description

2 SHEETS-SHEET 1.

PATENTED JULY 14, 1908.

A. P. MORROW,

DRILL GHUCK.

APPLICATION FILED OCT. 24,1907.

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aw/thy sea No. 898,348. PATENTED JULY 1 1, 1908. A P. MGRROW.

DRILL. CHUCK.

APPLICATION FILED 00:17. 24.1907.

2 SHEETS-SHEET 2 lowing to be a full, clear, and exact descrip same; l ig. 2-3 is' a v collective view in side assembled parts of a clutch embodying ALEXANDER P; MURROW,

Ol ELMIRA, NEW YORK.

DRILL-CHUCK.

no. ceases.

To all whom it may concern:

Be it known that l, ALEXANDER P. Mon- ROW, a citizen of the United States, residing at Eln'iira, in the county of Cheniung and State ol' New Yora, have invented certeiil new and useful Improvements in Drill- Chuclilh and I do hereby declare the follion oi the invention, such as will enable others Slill ed in the art to which it appce tains to make and use the some.

This invention relates to chucks, and more particularly to that class of devices in which tubular shell or case is employed having a rcvoluble head therein engaging gripping jaws which are slidably mounted u )011 or within the case and adapted to be advanced by the rotation of the head so .is' to grip an article. and to release their grip and rcccde into the case when the direction of rotation of the head is reversed.

The objects of the invention. are to pro duce an ell'icient, durable and inexpensive chuck of the character referred to consisting of few parts which may be easily assembled or taken apart, and to rovidc an antil'ric'tion bearing externa to the headadapted to sustain end-thrust and hold the head and case together, ainliurtbcr, todispensc with the usual screw-threaded connection between the revoluble head and case or shell and thus avoid the trouble and inconvenience resulting from injury to the threads upon the head, whichfrequently occurs when the head is made to project beyond the case in unscrewing the same so i liciriitl to advance or retract the gripping jaws.

The invention will first be hereinafter particularly described, with reference to the accornpsnyinp; drawings, which are to be taken as a part of this specification, and then pointed out in the, claims at the end of the description.

111 said drawii igrs, Figure i represents a perspective *iew with, parts broken away of a clutch embodying ny invention; Fig. 2' is a longitudinal sectional elevation of the elefinmy invention, end Fig. 4 is a transverse section, taken on the line 4----4 of Fig. 2, looking in the direction of the arrow.

ltcfcrring to the drawings, in which corvation, partly in s ction, of the several Specification of Letters Fa'tent.

Application filed October 2%, 1907.

rcspi'inding parts are d noted by similar Patented July 14-, 1908.

tierial No. 899,052.

letters in different views, the letter A may denote a tubular body or case having it frusto-conical section a, which is slot-ted lengthwise to )rovide suitable guides for a series of jaws which are slidebly fitted in said slots. d/ithin the case is lilted a revoluble heed C, having a section 0 sci-rived into its inner end, so that when rotated, (the inner section 0 being stationary) the screw-threadcd connection will cause the inner section to either advance or recede into the main body C of the head, according to the direction of rotation, therebvedvaneing; or retracting the jaws with which said section C is connected.

The periphery of the head (I is smooth, or I without screw-threads, and adapted to fit a correspondingly smooth bore of thetubuhtr body or casing, and these two partsnre connected together in such manner as to permit free rotation one upon or Within the other, While preventin endwise movement or separation thereof, by means of an antifriction bearing which, in the form shown, consists of a of balls E running in an annular groove c in the periphery of the head anda correspomling groove e on the inner side of the tubular body or case, the latter groove being formed partly in the main portion or body of the case and )artly in a detachable section or nut A, which may be screwed into an interiorly tln-cnded'recessed end ol' the case, as. shown in Fig. 2 of the drawings. As will be seen, the sec tion U of the head is formed or provided With, preferably, dovetail grooves or recesses 0, adapted to receive correspoiulingly shaped tenons l), on the sliding jaws B, which latter are fitted in the slots of the 'l'rusto-conicel portion of the case and are provided with marginal ribs l), engaging; recesses 11/ which extend along the mergins of said slots, so that jawsare supported by said marginel ribs Within the slots, and are confined therein against radial movement by means of n sleeve D, having a frusto-conical portion d, which overlies the frusto-conical portion of the case; said sleeve being screwed upon the case, as shown, or otherwise secured thereto. ltotetion of the case independently of the section C of the head is prevented, While'lon itudinal movement of the letter is perinittec, for the purpose of advancing or Withdrawing the gripping jaws, by the described connection between. said parts. For greater strength external lugs or projections 0 may and security against independent rotation of the reciprocating section Cot the heegl,

6 formed on its peripherydirectly in the rear of the dovetail slots therein, so as to engage the longitudinal slots in the frustoconicel section of the case. Said lugs may also scrvens :in abutment or stop --to limit the rearward movement of the section C within the head.

Exterior milled surfaces of the cese and sleeve may be provided, as shown, to afford a firmer hold upon said parts when it is desired to unscrew them, or for the purpose of rotating the case upon the centerpiece or head, or vice verse, when it is desired to edvzrnce or retract the jaws. The centerpiece or h id is recessed as usual to receive it tool or shank F, by which rotary movement may be imparted to-the heed while the tubular case is held stationery.

In operation, rotation of the head in one direction will gradually advance the gripping jews, cruising them to move Without rotating along the inclined surface of the frusto-conicel portion oi the case, as indicated in Fig. 2, until they firmly grip the shank of a tool or other article, and by a reverse movement of thehead the jaws will be retracted orceused to rccede into' the irusto-conicel portion of the case in theususrl manner, but by reeson of the anti-friction bearing, which telres the end-thrust and permits free and easy ro-- tetion, the desired results are accomplished without the exertion and Wear and tear incident to using chucks of a similar character as heretofore constructed, and there are no screw-threads on the heed to be exposed out side of the casing, with consequent liability to inpiry, Wlnle the threaded connection be I tween the telescopic sections or the head is protected by being inclosed ithin the case, all of which contribute to the general efficiency and durability of the device.

It will be understood, of course, that verious changes might be made in the details and arrangement of parts Without departing from the spirit and scope of my invention,

and hence 1 do not desire to be restricted to the specific construction and arrangement shown and described.

Having thus described my'invention What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1, in a chuck, it revoluble case and jaws adapted to be operated thereby, in combination with a. head within the case having a smooth cylindrical exterior, there being an annular race-Wavy between the case and head, and entidrictiondevices in said rece- Wey serving the double purpose of a bearing and a key to prevent end movement.

In a chuck, a 'revoluble case having a conical section With slots extending longitudinally thereofnnd jaws slidebly engaged with said slots, in combination with an internally threaded head having an externally threaded section screwed therein, said section being connected with said jaws so that they are moved. longitudinally and radially by rotation of the case or head, and projections on said threaded section engaging the slots in the case for cooperative action in preventing independent rotation and to lin'iitreerwerd movement ofseid threaded section, I

In testimony whereof I afiix my signature in presence of two Witnesses.

' ALEXANDER P. MORROVV.

/Vitnesses: i

ROB RT V. R. BASSETT, Eunice B. W EST.

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