US1937236A

US1937236A - Feed collet

Info

Publication number: US1937236A
Application number: US652071A
Authority: US
Inventors: Laughlin Guy
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-01-16
Filing date: 1933-01-16
Publication date: 1933-11-28
Anticipated expiration: 1950-11-28

Description

Nov. 28, 1933. G, AUGHUN 1,937,236

FEED COLLET Filed Jan. 16. 1933 Patented Nov. 28, 1933 UNITED sTATE-s p FEED: coLLE'r t Guy Laughlin, Birmingham, Mich. application January 16, 19.33. ser-rar No; 652,071

Claims.

.' 5 Briefiy stated, one :of the aims of the invention is to provide a feed collet of, the type described in which thepads ,or work gripping elements are ,freely interchangeable to'allow of the employment of pads of Various sizes and configurations,

according to the size and cross-sectional formation of the work, of whatever nature it happens to be, all without removing the collet from the ,machine to which itis attached.V j

'Another aim ,of the invention is toprovide a feed collet of the detachable pad type in which ,the resiliency of the fingers of the collet is relied upon to hold the pads in place when the chuck is not in actual use.

-By way of further brief reference to the mounting of the pads it is pointed out that the longitudinal edge portions of the pads protrude beyond thelongitudinal edges offlthe supporting fingers totdefine contacting bearing lands or points that are freely grindable to allow the resiliency of the body'to bring the pads Closer together and-thereby compensate for the wear that invariablytakes place as 'an incident to movement `of stock through the chuck. A further aim is to provide a feed chuck of the type described, which is of highly simplifiedconstruction, cheap to manufacture, andionejwhich may be employed without departing from ,established production methods. w i i 1 z Other objects and advantages will be apparent during the course of the following description; i

In the accompanying drawing forming a part w of this application and in which like numerals are employed to designate like parts throughout the same,

Figure l is a perspective of the improved feed collet, i

Figure 2 is an end view of the collet,

Figure 3 is a fragmentary side elevation of the collet in engagement with a piece of work, a portion of the collet being broken away,

Figure 4 is a Vertical transverse sectional view of the oollet may be separated to remove or attach thefiller. i

In the drawing, wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 5 generally. designates a tubular body, which may be formedlfrom pressed metal, tubing, cast metal or machined from solid stock, having the `conventional attaching means 6 in the form'of an externally threaded stem. If desired, the attaching means 6 maybe inthe form of an internally'rthreaded stem. i It isclearly shown in Figuresl, 3 and'5 that the tubular body is Vprovided-with a plurality of spaced parallel `lon'gitudinallyl extending,V slots 'opening out through the forward end of the body and defining'transversely curved spring leaves 8. With particular reference to Figure 3 it will be seen that the forward end portions of the leaves 8 are extended inward to define strengthening y` vand retaining Shoulders `10 of arcuate form, such i Shoulders being located in Vadvance of circumferentialshoulders 12 formed, on the inner sides of the vleaves. j ,i

'Ifhe Shoulders l;0 and 12 define what might be saidjto be lan annular groove receiving'the outer portions of a filler embodying'a plurality ofarcur-l ate padsl4. vMore specifically, the pads 14 are snugly positioned` between the shouldersglo and 12 and are held against longitudinal -shifting thereby. The pads 14 may be constructed from different-kinds of material, such as tool steel, :cast iron, bronze or; chromium plated to meet existing requirements. v I

It is shown in Figures 1,.5 and '7 that the pads 14 are increased in circumferential measurement toward points between the ends thereof and vthat the longitudinal edge portions of the pads protrude beyond the longitudinaledges of the fingers 8 thereby defining opposed lands in the form of substantially equi-lateral triangles, said lands having apexes in engagement with each other to aid in securing the pads in place and being freely grindable to diminish the bore of the body. That is to say, when it is found that wear has enlarged the bore through the filler 14 the edge portions of the pads and more particularly, the high points of said edge portions may be ground an amount sufficient .to restore the bore of the filler to its original diameter. In this connection it is noted that the ,pads and the shell are of dissimilar materials, the pads being of a more 'readily grindable material.`

Of course, the fingers 8 are tempered to press inwardly and in fact, such fingers are shown to converge toward the forward ends thereof urging the pads 14 in pressure engagement with the work.

It is shown in Figure 1 that when the improved Chuck is not actually in engagement with a piece of stock, theinherentresiliency of the fingers holds the pads securely in place and in this connection attention is invited to Figures 3 and 4 in which it is illustrated` that a radialpin 16 is carried by one of the leaves 8 and is received in an opening 18 in one of the pads so as to hold the pads against circumferential shifting, it being obvious that since the pads are in edge to edge engagement it is sufiicient in small sized collets to employ but a single pin to inhibit such circumferential shifting of the pads. However,. in larger sized collets more than one of the radial pins 16 may be employed to hold the pads against circumferential shifting.

Should it be desired to remove the pads for the purpose of grinding the contacting edges thereof, or for the substitution of pads of a different size or cross-sctional formation, it is a simple matter to spread the forward end of the shell with the aid of a suitable number of hand tools 20, as shown in Figure 7,

More particularly, the forward portion of each 'hand tool 20 is provided with an angularly directed bill of a size to fit easily between opposed Vedges of the lfingers 8 so that when the tool is turned, the space between the fingers will be increased allowing the pads to be easily detached. Of course, as a prel'iminary to mounting the pads of the required Character in the shell, the space lbetween the fingers is temporarily increased with 'the Vaid of the handtools 20. If desired, one hand tool may'be engaged with each pair of opposed edges of the fingers.

From the foregoing it will be seen that the feed chuck herein disclosed provides a simple means by which the-master or shell may be employedin cohjunction with nterchangeable pads providing a simple means Vby which the desired bore may be provided or maintained and it is shown in FigureVlthat the ends of the pads are beveledto 'allow 'o'f thefr'e'e passage of the work, the-bevel 'at the rear-'ends of the pads meeting the adjacent corner` of the internal shoulder to prevent the jamming of the stock at this point.

-Having -thus described the invention, what is claimed i' S':'- I

- -'1. Ina feed collet, a tubular body having a bore 'and aV plurality of spring fingers provided with spaced internal Shoulders, pads between the shoul- 'itv ders and increased in circumferential measurement toward points between the ends thereof and having the longitudinal edge portions thereof protruding beyond the longitudinal edges of the fingers thereby defining opposed lands in the form of substantially equi-lateral triangles, said lands having apexes in engagement with each other to aid in securing the pads in place and being freely grindable to diminish the bore of said body.

2. In a feed collet, a tubular body having a bore and a plurality of spring fingers, a filler within said body and having a series of arcuate pads increased in circumferential measurement toward points between the ends thereof and having the longitudinal edge portions thereof protruding be- ,yond the longitudinal edges of the fingers thereby defining opposed lands in the form of substantially equi-lateral triangles, said lands having apexes in engagement with each other to aid in securing the pads in place, and being freely grindable to diminish the bore of said body.

3. In a feed collet, a tubular body havinga bore and a plurality of spring fingers, pads within the body and increased in circumferential measurement toward points between the ends thereof and having the longitudinal edge portions thereof protruding beyond the longitudinal edges of the fingers thereby defining opposed lands of triangular form, said lands having apexes in engagement with each other to aid in securing the pads m place and being freely grindable to diminish the bore of said body.

4. In a feed collet, a tubular body having a bore 'and a plurality of spring fingers, pads within the body and increased in circumferential measurement toward points between the ends thereof and having theV longitudinal edge portions thereof protruding beyond the longitudinal edges of the fingers thereby defining opposed lands of triangular form, said lands having apexes inengagement with each other to aid in securing the pads in place and being freely grindable to diminish the bore 'of said body, there being means holding the pads against circumferential shifting.

i 5. Ina feed collet, a tubular body having a bore and a plurality of spring fingers, pads within th`e bo'dy and increased in circumferential measurement toward points between the ends thereof and having'the longitudinal edge portions thereof protruding beyond the longitudinal edges of the fingers thereby defining protruding lands, said lands having apexes in engagement with each other'to aid in securing the pads in place. w

` i GUY LAUGI-ILIN.