US1254071A - Chuck. - Google Patents

Description

WILLIAM F. REINLIE, OF CHICAGO, ILLINOIS, ASSIGNOR TO ILLINOIS TOOL WORKS, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CHUCK.

Specication of Letters Patent.

Patented Jan. 22, 1918.

Application led January 15, 1917. Serial No. 142,343.

To all whom it may concern.'

Be it known that I, WILLIAM F. REINLrE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Chucks, of which the following is a specification.

My invention relates to Ichucks for holding abrasive grinding sticks, and the object of the invention is to provide means whereby the grinding stick will be held in the chuc c very securely and yet will not be in danger of being crushed under the holding pressure. It will be understood that in tool linishing and for other purposes in the mechanic arts,-

rapidly rotating grinding sticks 0r points are employed. 'lhese sticks or points are subject to breakage if subjected to too great a stress and yet they must be lirinly held, for they commonly rotate at a very high speed and are frequently forced with considerable pressure against hard metallicsurfaces. My purpose is, therefore, to provlde a chuck 1n which the grinding stick can be firmly bedded and held. Contributory to this general purpose, it is my object to provide a chuck of this character which shall be simple and elicient in construction and easy to manipulate.

I obtain my object by the mechanism illustrated 1n the accompanying drawings, in which:

Figure 1 is an axial section of a chuck embodying my invention. It shows the grindin0r stick in position.

4`ig. Q is an end view 0f the left end of Fig. l.

Fig. Fig. 1.

Similar numerals refer to similar parts throughout the several views.

Referring to the drawings, the shank l is of any form suitable for fastening it into the rotating spindle of the grinding machine. At its head end it has a threaded portion 2 onto which screws a cap 3. At the forward cnd this cap is eonically tapered internally, and preferably also externally. lVithin the tapered portion of the cap is a ring 4 of lead or similar material capable of having its configuration changed when subjected to pressure. For convenience I will refer to it as plastic although it is less plastic than many substances characterized by that term. The ring surrounds the body of the grinding 3 is an end view of the right end of and revolve at very high speed and need all the support that can be given them, especially. at the front end. In order to give an especially firm backing at the inner end, the

shank 1 occupies practically the entire cross sectional. area of the cap 3 and backs up the grinding stick. Hence there is no possibility for the stick to back away from the work or in any way loosen the grip of the parts. In the form shown the cap is provided with sockets G for receiving the points of a spanner wrench or other suitable tool by which the cap may be rotated.

In operation, the parts are rst loosely assembled in the relative positions shown in Fig. 1. The ring 4 is originally but slightly larger in internal diameter than the external diameter of the grinding stick and it also approximately fits the internal conical surface of the cap. But as soon as reasonable pressure is exerted to screw the cap onto the shank l, the cap begins to compress the plastic ring onto the grinding stick, the longitudinal motion of the plastic ring being limited by the head end 0f the shank. Consequently, a comparatively small amount of turning of the cap after the parts are assembled as tight as they can be by the fingers is sufficient to grip the body of the grinding stick lirmly and thereby secure it so that it will rotate with the chuck. On account of the plastic characteristic of the material of which the compression ring Ll is formed, the pressure upon the various points of the grinding stick is equalized and hence, not only is the grinding stick held very lirmly, but the danger of breaking it by pressure from the chuck is eliminated. The device is of simple form and few parts and may be readily taken apart by simply unscrewing the cap from the shank.

Having thus described my invention, what I claim as new and desire to secure by Iietters Patent, is:

l. chuck for holding short grinding sticks, said chuck vhaving an internally tapered cap surrounding the stick, a plastic ring surrounding the stick and located between the stick andthe cap, and a shank entering the back of the cap and forming a backing for both the ring and the stick.

i therefrom at the mouth, a plastic ring between the stick and the cap, the outer end of the ring being substantially iush with the 6116er end of the cap and the inner end of the nasser/i stick being substantially nsh with the inner end of the ring, and a shank screwing into the hack end of the cap and forming a backing for both the stick and the ring.

3. A chuck for holding short grinding sticks, said chuck having an internally tapered cap surrounding the stick, a ring surrounding the stick and located between the stick and cap, and a shank entering the back of the cap and abutting corresponding ends of the ring and stick.

In witness whereof, I have hereunto subscribed my name. v

WILLIAM F.'HREINLIE

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