US1611968A - Method of making pliers - Google Patents

Description

Dec. 28,1926. 1,611,968

A. C. WEBSTER METHOD OF MAKING PLIERS Filed April 19. 1924 2 Sheets-Sheet 2 z 'wumtofc /0 @211ML amm/? Patented Dec. 28, 1926.

UNITED YS'i'TlI-'S PAT-ENT V-orrics AvRVIN' C. WIElIBS'lElR,` 0FA DETROIT, MICHIGAN.

METHOD or MAKING runas.

Pliers as usually made are vforged :from metal stock usually in the form of aired. The forging ofthe'pliers in this manner results in a flash between the diesjon the forged piece due to the fact that more metal is found in the piece from which 'the plier sections areI forged than is necessary to fill the dies. rThis flash is usually trimmed off after the plier sections are formed.

The metal of the stock being forged which forms the flash necessarily flows in a direction at right angles to the forging motion of the'dies which causes a decided weakness in the forged piece, especially when the flash is thin It is the primary object of my inventionA to forge plier sections either hot or cold or both from sheet metal blanks which have been cut out in pre-determined sizes so as to accurately fill the forming dies and obvi ate flash.

It is obvious that a plier so constructed, in addition to being much stronger because the metal is not flown incorrectly so as to form a flash, is materially cheaper of manufacture than the forgedplier.

lith the above and other objects in view my invention consists in the arrangement, combination and construction of the various parts of my improved device and the various steps of my improved method as described in the specification, claim-ed in my claims and shown in the accompanying drawings in which:

Fig. 1 is a sectional view of the dies used in my method showing the sheet metal blank therebetween. y

Fig. 2 is a like view showing the dies brought together so as to form the blank into a plier section.

Fig. 3 is a top or plan view of a portion of the bottom die showing the, formed plier section therein. j

Fig. 4 is a sectional view taken on line l-l of Fig. 1 with the Vtop diel brought almost against the blank.

Fig. 5 is a sectional View taken on the line 5-5 of Fig. 1 with the topdie brought aln most in Contact with the blank,

Fig. 6 is a sectional view taken on line 6-#6 of Fig 1 with the top die brought down against the top of the blank.

Fig. 7 is an elevation of one plier section or handle.

Fig. 8 is an elevation of the other plier section or handle.

9 isan elevation "ofthe assembled plier.

Fig. 10 isa sectional view taken on line iowionf rig e.

I 'have shown 4-a top die section 11 and a bottoni Adie section 12 with la formed sl'leet Imetalblank 13 between them. The `dies 11 and 12 `are brought together in 'a single squeezing power stroke so as to form completely in a single stroke a plier section 14.

The top die 11 is provided with corrugations 15 so as to form the corrugated gripping portion 16 on the handle of the plier section, and is likewise provided with corrugations 17 so as to forni the corrugations 18 on the j aw of the plier section.

The lower die 12 is chamfered at its top edges 19 permitting entrance of the top die 11 therein. Likewise, the bottom of the forming portion of the die 1Q, is provided with a tapered fill 2O adapted to bear against the lower free corner of the blank 13 so as to prevent the blank moving in the die to crosswise position which would interfere with proper heading of the jaw.

The upper die. 11 is of curved formation as shown at 21 in Figs. 5 and 6 so as to give a rounded effect to the finished plier section.

Two sets of dies may be used, each slightly varied as to details from the other so as to make two plier sections 32 and 33, the former being provided with an aperture Q2 and the latter with an aperture 23.

For assembling the two plier sections together I utilize a rivet having two body diameters 241 and and a head 27. The rivet is permanently fixed to the plier section 33 by placing the shoulder of the body section 25 against it and then forming the head 26 on the rivet. The body section 25 of the rivet is slightly larger than the thickness of the plier section 32, thus permitting free movement of the latter. The method of securing the plier sections together, being foreign to the method claims herein set forth is not claimed in this application.

It will thus be seen that in forming a plier section as heretofore described, the portion of the blank shown in Fig. 5 remains practi-- cally in its original state, very little upsetting thereof taking place. On the other hand, the two ends of the plier sections are upset to a considerable extent in order to form the jaw and handle portions.

It is obvious that pliers formed in the,

foregoing manner will be very cheap of Hlfl lill

manufacture, andY it is also obvious that by forming the blank of sheet metal, a' fixed pre-determined amount of metal may be used so as to prevent over filling of the dies and the formation of a flash, by avoiding Which the plier is made materially stronger.

It is obvious that various changes may be made in the arrangement, combination and construction of the various parts of my improved device as Well as of the methods used Without departing from the spirit of my invention, and it is my intention to cover by my claims such changes as may be reasonably included Within the scope thereof.

l/Vhat I claim is:

1. The method of forming a plier section which consists in disposing a sheet metal blank between dies, securing at least a portion of said blank in at least one of said dies so as to prevent displacement thereof, and then bringing' said dies together to upset said section into its desired shape.

2. The method of forming a plier section Which consists in placing a sheet metal blank having a general outline of the section in a die having a curved bottom and then bringing another die, having a curved portion on its forming face, against said blank so as to upset the blank and form it into the desired shape at least al portion of the formed piece "if having curved edges.

' ARVIN C, lEBSTER.

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