US915659A - Loose punch. - Google Patents

Description

G. H. CLARK. LOOSE PUNCH. APPLICATION FILED MAR. 2'2, 1907.

915,659. I Patented Mar. 16, 1909.

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rin rrnn STATES PATENT OFFICE.

CHARLES nouns CLARK, or GRAFTON, PEriN'sYLvANIA.

LQQSE PUNCH.

Specification of LettersPatent.

atented March 1 6,.1-909-.

Application filed March 22 1907. Serial No. 363,891.

The object of the invention is the provi;

sion of a loose punch adapted to pass through and drop from the hole which it cuts, said punch being of such configuration as to maintain throughout'its length the greatest possible cross sectional area in a punch of this character. A further object of the invention is the provision of a loose punch of the character setforth and having plane upper-and lower faces by virtue of which the punch will maintain itself in an upri ht positionwhen placed'upon the materia tobe punched. This arrangement of plane faces also renders it possible to use a plurality of punches adapted to be acted upon byv a rain of such areaas to overlie a plurality of punches.

Since any portion of the surface of a fiat ram,

is adapted to coact with the plane upper faces to the punches, it is apparent that the position of the punches may 'bevaried at will to thereby vary the location of the holes to be punched in the material.

A further object of the invention is to eliminate the necessity of stripping the material from the punch and to provide punches of varying lengths adapted to be acted upon by a ram'common to all of theni, wherebythc pressure required to force the punches through the. metal is delivered g 0 through a greater duration of time, thus greatly reducing the work per unit of time,

and making the total work of the ram more uniform.

Further objects and advantages of the in- 46 vention will be set forth in the detailed description which now follows. In thcaccompanyin drawing, Figure 1 is a plan view of a punc and the arts connected therewith, and Fig. 2 is a view partly .50 in section and partly in side elevation on application for patent for a' machine for punching holes in metal plates, or other punching machine and a.

structural material, filed. Feb. 26, 1907, Serial No. 360,061, and in which these punching tools are shown.

Like numerals "designate corresponding;-

parts in both of the figures of the drawing. I

Referring to the drawing, the numerals 63 designate the jawsmf a punching machine,

said punching machine. being provided with the usual vertically movable ram2, said ramhaving a plane lower face. A die templet 29 .is removablymounted u on; the lower jaw 63, and carries a die 9. The dietemplet is provided with upturned bifurcated jaws which are adapted to receive horizontally projecting. pins of a punch templct 31. This-punch 'templet has an openin formed therein whichis adapted to receivet e punch- 7 which forms" the' subject matter of the It is apparent thatnpon the descent ofthe ram 2, with sufici-ent present invention.

force, the punch 7 will be forcedthr'ough thematerial 8, and after it is free of said mate rial, will drop through the openingof die 9,

said punch following the slu which has been punched from the inateria, through said die. Any convenient means for catching thepunches below the machine, separating them from the slugs'and returning them to a convenient point for re-use, may be employed.

The punch 7 has plane upper andlower faces. This punch will therefore maintain itself in an upright position upon the mate'- rial to be punched, its location upon said material being determined by thelocation of the opening in the punch tem let. Since the ram 2 is likewise provided wit aplane lower face, it will be seen that the thrust upon the punch is a direct vertical thrust and that consequently there is no tendency for the punch to turn over. The provision of these plane upper and lower faces in a'loosepunch, or :a punch which has no external support, is an 1m ortant feature. sis best illustrated inFig. 2, the shank of the punch is longitudinally curved throughout a portion of its'length and is straight throug out the remainder of its length. This structure is likewise a very important one, for the following reasons:As soonas the unch begins to penetrate the: metal, the ma= terialaround the up er edge of the hole being;

punched, tends toow inwardly thereby decreasing to aslight' extent the diameter of the If the punch were. perfectly straight, I

hole. it is apparent that'this inflow of the metal shank of the i would bind upon theshank of the punch and prevent it from fallin freely from the machine. Upon the ot er hand, where the Ipunch is tapered from en to end, the punc is unduly weakened for is only necessary to reduce the punch from the lower face to a point which lies about at the upper face of the material at the completion of the punching operation. From that point, the shankof the punch may be straight. This renders it possible tosecure the greatest degree. of strength in a' punch of this character, and results in reducing the fiber strains in the punch. It is apparent that 31 may have holes for corresponding punches to thereby unch two or more holes at one operation 0 ram 2. Where a plurality of quired to force the punches -t punches are used, I prefer to make them of varying lengths to reduce the ressure rerough the material.

- The provision of the bifurcated extensions "for engaging the pins of the punch templet 31 enders said punch templet freelyv adjustable with relation to the die templet. Pieces 8 of varying. sizes -may therefore be inserted between the punch templets and the dies while maintaining said punch templets in a horizontal plane. Since both the punch and die templets are removable, it is apparent that other and similar parts carrying the proper dies and punches may-be substituted therefor when it is desired to' unch holes of differ vent sizes and shapes or ocation.

From the foregoing description, it will be seen that simplean'd eflicient means are herein provided for accom lishing the objects of the invention, but wh e the elements shown and describedare well adapted toserve the purposesfor which they are intended, it is to the head and the base.

e understood that the invention is not lin1- itedto the precise construction setforth, but includes within its purview, such changes as may be made within. the scope of the appended claims.

Hav' g described my invention, what I claim is 1. A loose unch adapted to pass entirely through the iole which it cuts and having a head and a .base of greater area than the head, and a-shank portion the surface of which lies inside .of a straight line between 2. A loose punch adapted to pass entirely through the hole which it cuts,-

said punch havm a flat head and a flat base of greater area tan the head, and a shank portion, the

surface of which lies inside of a straight line between the head-and the 3. The" combination loose unches ada ted to pass completely throug the holes w 'ch theycut, of a ram of base.

such area as to overlie a p uralitv of said punches'simultaneously', said punches being of varying lengths. I

4. The combination with plurality of loose punches adapted topass completely throu h the holes which they cut, of a ram of suc area'as to overlie a lurality of said punclies simultaneously, sai unches being of varyiru lengths, and the ower faces of reater area than would present.

5. The combination with a plurality of loose punches adapted to pass completely through the holes which-they cut, of a ramof such area as to overlie a lurality of said punches simultaneously, said punches being of varying lengths, the lower faces of sai punches presenting a greater area than any cross section through said bunches would present, andthe shanks of said punches being ongitudinally andinwardly curved.

6. The combination with, a plurality of loose throng the holeswbich they cut, of a ram of such area as to overlie a plurality of said punches simultaneously, said punches being of varying lengths, the lower faces of said,

punches presenting a greater area than any cross section through said punches would resent, the shanks of said punches being lhngitudinally andinwardly curved, and said punches having plane upper and lower faces 7. The loose punch for punching holes in metal and adapted to pass entirely through the hole which it cuts, said punch having plane upper and lower faces connected by a ongitudinally curved'shank.

8. A punch comprising-a shank portion.

and upper and lower faces, the lower face resenting a greater area than the upper ace and said shank being inwardly and longitudinally curved for a portion of its length, and straight for theremainder 'of its length.

9. A loose punch adapted to pass entirely through the hole which it cuts havin plane upper and lower faces and a shank the surface of which lies'inside of a strai ht line between the edges of the upper and ower faces.

10. The combination with a unch adapted to pass completely through t e hole which it cuts, of a die tern let, a punch templet adapted to maintain t e loose punch in ahnement, said punch templet being connected die templet.

with a plurality of unches adapted to pass completely 11. A plurality of loose punches ada ted metal= plates adapted to pass conipletelii to pass completely through the holes w 'ch through the hole which it cuts, said punc they cut, said unohes bein of varying having a plane upper face and a lower cute lengths substantially as descri ed. ting edge, the area included by the cuttin 15 5 2- ..12. Aloose punchedapted to pass through edge being greater than would be include the hole which it cuts in combination with a in any cross section through the punch parram having an operating surface adapted to allel to said cutting edge. 1 7 act upon said punch-,any portion of said CHARLES HOMER CLARK.

operating'surface' being adapted to engage Witnesses; 10 said punch for operating the same. BERTHA PENoE,

O. H. Mosmn.

13. A loose punch for punching holes in

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