US829153A - Drill-chuck. - Google Patents

Description

PATENTED AUG. 21, 1906.

G. H. HOLLM. DRILL CHUCK.

APPLIUATION FILED JUNE 29. 1904.

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DRILL-CHUCK.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed June 29, 1904:. Serial No. 214,672.

To all whmrt it may concern.-

Be it known that I, GUSTAV H. HOLLM, a citizen of the United States, and a resident of Fairfield, in the county of l airlield and State of Connecticut, have invented certain new and useful Improvements in Drill-Chucks, of which the following is a specification.

My invention relates to new and useful improvcn'ients in drill-chucks, such as are used for attachment to the spindle of drill-presses and like machines to hold tools of various kinds and sizes.

It is the object of the invention to improve upon devices of this class by simplifying and cheapening the cost of manufacture and at the same time to produce a strong and dura ble chuck that may be quickly operated to re lease the tool when the spindle carrying it is either still or rotating, and, finally, to provide means, such as detachable collets, for accommodating different size tools.

With the above and other minor objects in view my invention resides and consists in the novel construction and combination of parts shown upon the accompanying sheet of drawings, forming a part of this specification, upon which similar characters of reference denote like or corresponding parts throughout the several figures, and of which Figure 1 is a central vertical ltmgitudinal section elevation of my improved device, taken 011 line 1 l of Fig. 3. Fig. 2 is a central vertical longitudinal section elevation, taken at a right angle to Fig. 1 and indicated by line 2 2 of Fig. 8. Fig. 3 is a transverse crosssection of the invention, taken on line 3 3 of Fig. 2; and Fig. 4 is a detail side elevation of the collet detached.

Referring in detail to the characters of reference marked upon the drawings, A indicates the body, which is provided with a tapering shank B, adapted to fit in the socket of the rotatable spindle of a drill-press or other suitable machine-tool.

C is a cylindrical pocket within the body to receive the collet D for carrying a tool, (not shown,) such, for instance, as a tap or drill. Several of these collets are provided with each chuck and each contain a tapering recess E of a different size in order to accommodate various sizes and styles of tools. Within the body and through the pocket is arranged a pair of round pins F F, which are loosely fitted in oblong openings G in a Way to afford a slight sidewise and rotary movement of the pins therein and with respect to both the body and collet. The purpose of these pins, as will be apparent, is to engage shouldered sockets preferably formed by the concave-convex sides of the reduced transverse head H on the upper end of the collet. Upon the annular surface of the body is fitted a sleeve 1, having a tapering internal annula wall J to engage the rounded ends K of the pins in a manner to move the same sidewise in their oblong holes and close them together to engage the concave shoulder of the head of the collet. The lower end of the sleeve is provided with a washer L, which is attached by means of screws, forming a bearing and serving to limit the upward movement of the sleeve on the body.

In the operation of my device the collet is attached by first raisin the sleeve 1 up to release the pins, after wlnch the collet is inserted and its transverse head shoved in between the rotatable and slidable pins until it fetches up against the same, when the sleeve is dropped, its tapering wall engaging the ends of the pins in a manner to force the same in under the shoulders of the head to rigidly hold the collet in a way to drive the same. It will be obvious that the collet is removed by simply raisin the sleeve to release the pins, when said col et is free to be withdrawn.

The special advantages contained in the above construction resides in' the employment of the parallel transverse pins which 0 crate in connection with the broad side of t e collet-head, thus insuring a positive, strong, and durable engagement. The pins being round and mounted at their ends in oblong bearings serve not only to move in and out to engage the collet, but are also susceptible of a rotary movement when engaged by the head of the collet, thus insuring an easy insertion or removal of the collet.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is a 1. In a drill-chuck of the class described, the combination with a body adapted for attachment to a driven spindle and having a pocket, of round pins arranged transversely through said body and pocket and fitted in oblong openin s on either side of the body so as to be movab e toward and from each other, a collet Within the pocket to receive a tool and having a head. with a transverse shoulder on either side for the engagement of the sides of the pins, and means for forcin said ins toward each other under the shou ders 0 the head of the collet in a way to hold the same.

2. In a drill-chuck of the class described, the combination with a body having a pocket and oblon openings, of a collet to fit the pocket an havin a tool-socket and a transverse shouldered iead, pins arranged transversely through the oblong opening of the body so as to be movable toward and from each other and across the pocket on either side of the head to engage the socket of the same and means for providing a sidewise and rotary movement of the pins to and from the head and means for holding the pins in en- 15 gagement with the head of the oollet to retain the same.

Signed at Brid e ort, in the county of Fairfield and State fi onnectiout, this 26th day of May, A. D. 1904.

GUSTAV H. HOLLM.

Witnesses:

C. M. NEWMAN, W. V. Dnvrr'r.

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