US2429700A - Feed collet - Google Patents

Description

1947. I. H. SHEFFER Q 2,429,700

FEED COLLET Filed March '7, 1945 r 7 I Q INVENTOR. E. 5 5 BY. jaw/7176677 Jzur' Patented Oct. 28, 1947 "UNITED STATES PATENT" OFFICE ,3 2,429,700 W FEED coLLn'r V V Irving H. Shefier, Traverse City, Mich. l I I Application March '1, 1945, Serial lvassinae 1 Claim. (01. 279-41) I This invention relates to improvements in feed collets and refers particularly to feed collets provided with removable pads. Y j V 7 -It is an object of the invention to provide a feed collet including an annular casing, a removable pad therein split longitudinally into a plurality of sections; and resilient fingers integral with the casing bearing against each pad section adjacent opposite extremities thereof to apply pressure substantially uniformly throughout the length of each section and force it inwardly toward the collet axis.

Another object of the invention is to provide such a feed collet wherein coacting means are provided in the casing and pad sections for limiting the forward movement of the latter in the former and for preventing rotation of the sections in the casing thereby retaining the sections in such position that one pair of resilient fingers bears upon the outer periphery of each pad section substantially centrally of its width.

A further object of the invention is to provide a feed collet including an annular casing having an annular plug on one extremity thereof for retaining the pad sections therein, and wherein both the casing and the pad sections are radially apertured to receive a tool for holding them during rotary engagement or disengagement of the plug with the casing.

Having thus briefly and broadly stated some of the objects and advantages of the invention I will now proceed to describe a preferred embodiment thereof with the aid of the accompanying drawing, in which:

Figure 1 is an enlarged view of the feed collet partly in section, and

Figure 2 is an end view thereof.

Figure 3 is a side view, partly in section, showing the annular casing,

Figure 4 is another side view thereof, and

Figure 5 is an end view of Figure 3.

Figure 6 is a side view of one of the pad sections,

Figure 7 is another side view thereof showing, however, two pad sections at their normal spacing from one another.

Figure 8 is an end view of the pad.

Figure 9 is a side view, partly in section, of the annular plug, and

Figure 10 is an end view thereof.

Referring to the drawing, designates a tubular casing through which toward opposite ends substantially U-shaped slots 2 arranged in longitudinally aligned pairs are provided, thereby forming resilient fingers 3 integral with the casing. Moreover the slots '2 are so disposed that the fingers 3 which are somewhat inwardly flexed toward the casing axis point outwardly toward the adjacent ends of the casing. Provided in the bore of the casing l are a plurality of segmental pad sections 4 against the outer periphery of each of which one longitudinally aligned pair of fingers 3 bears centrally of its width. The inner peripheries of thepad sections together form a central opening 5 coaxial with the bore of the casing I through which a piece of stock A fed by the collet extends. The purposeof the resilient fingers 3 is to force the pad sections into gripping engagement with the stock to move the latter when not otherwise held with the collet.

Formed in the bore of the casing I adjacent its front extremity and projecting inwardly therefrom are segmental stops 6 and projecting fortween adjacent sides of the stops.

wardly from and integral with the pad sections 4 centrally of their width lips I which extend be- Thus the stops hold the pad sections against rotary movement in the casing, and retain each section so positioned that one pair of resilient fingers 3 bears on each section centrally of its width.

At its rear extremity an internal thread 8 is formed in the casing I to receive the front extremity of an annular plug 9 having a corresponding external thread I0. When the plug is tightened the pad sections are held against longitudinal movement between it and the stops 6. The rear extremity of the plug 9 is provided with suitable means for attachment to a conventional feed tube (not shown) and in the present instance consists of an external thread I I. The plug 9 is preferably countersunk from opposite ends and centrally of its length its bore, which is of course coaxial with the opening 5 through the pad sections, is of such size that the stock A may slide therethrough and be to some extent supported thereby.

To facilitate engagement and disengagement of the annular plug 9 with the casing l the former has a tool engaging means thereon such as a radial opening I2 so that the said plug may be easily turned. The radial margins of the pad sections 4 are also slotted at [3 from their rear extremities so that radial apertures M are formed between each pair of the radial margins. Extending through the casing l and registering with the apertures 14 is an opening i5 so that a second tool may be inserted through the opening and the aperture to rotate the casing and pad relative to the plug 9.

While in the foregoing my feed collet has been described and shown with only two pad sections it is of course understood that a greater number of sections may be utilized when desired, in which event a correspondingly greater number of fingers 3 must also be provided as two longitudinally aligned fingers are'required to bear on each pad section centrally of its width and toward each end thereof.

It is also understood that other alterations and modifications may be made to the construction heretofore described provided the said alterations and modifications fall within the scope of the ap -v pended claim.

What I claim is:

A feed collet including a tubular casing having U-shaped slots arranged in longitudinally aligned pairs formed therein with the transverse portions of the Us remote from one another, said slots forming longitudinally aligned pairs of fingers integral with the casing which point outwardly toward opposite and adjacent ends thereof, said fingers being resilient and somewhat inwardly flexed toward the axis of the casing, a plurality of segmental pad sections in the casing against REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,94 1;9,99' Rednier Jan. 2, 1934 1,127,129 Warner et al Feb. 2, 1915 2,1 7,170 OConnel1- Jan. 16, 1940 1,210,947 Kirsch Jan. 2, 1917

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