US1006472A - Process of forming joint members for pins. - Google Patents

Description

s. FISCHER. PROCESS OF FORMING JOINT MEMBERS FOR PINS.

APPLICATION FILED MAB.17, 1911.

1,006,472. Patented 001;. 24, 1911.

Fig. 2. 3 5 /3 l7 7 mg; Filo.

Guam m;

UNITED STATES PATENT OFFICE.

SIGMUND FISCHER, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR T0 FISCHER AND PRUEFER, 0F PROVIDENCE, RHODE ISLAND, A FIRM.

PROCESS OF FORMING JOINT MEMBERS FOR PINS.

To all whom it may concern:

Be it known that I, SIGMUND FISCHER, a citizen of the United States, and resident of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Processes of Forming Joint Members for Pins, of which the following is a specification.

This invention relates to the process of forming a joint member for pins in which the pin-tongue head may be mounted, and the object of the invention is to provide a process whereby this joint member may be formed from the back plate of the pin by first cutting the blank into the proper shape, then forcing outward from the plane of the plate a portion intermediate its ends and .folding the edges of the two halves of each side wall of the outwardly pressed portion toward each other until said edges meetthereby forming a socket loop and providing the wall of said socket with a slot through which the pin-tongue is designed to operate.

lVith these and other objects in View, the invention consists of certain novel features of construction as will be more fully described and particularly pointed out in the appended claim.

In the accompanying drawings: Figure 1 is an enlarged sectional side elevation of a pin showing my improved form of joint member. Fig. 2shows a blank portion of a back plate from which my improved joint member is struck up. Fig. 3-

IS an enlarged sectional view of the joint member as drawn or swaged up from the stock illustrated in Fig. 2. Fig. 4; is a plan view of the joint member shown in Fig. 3. Fig. 5- is a section of the joint member on line 5--5 of Fig. 3, illustrating a portion of the pivoted end of the pin stem also in section held within the said joint member. Fig. 6 is a section through the joint member on line 66 of Fig. 5. Fig. 7- is a central transverse section on line '77 of Fig. 3. Fig. 8 is a modifica tion illustrating the rearwardly projecting end of the joint member removed and the front plate rolled up against the lower edge of said joint member. Fig. 9 is a plan view showing a portion of the female die. Fig. 10 is a sectional side elevation showing the socket of the joint member bent up Specification of Letters Patent.

Application filed March 17, 1911.

Patented Oct. 24, 1911.

Serial No. 615,161.

in position in the die, the male portion having been withdrawn therefrom.

Referring to the drawings, 1 designates ,the front portion of the pin body and 2 the back plate or pin-carrying plate thereof around the edge of which the edge of the front plate may be rolled to secure the two members together. This back plate is preferably cut from sheet stock into the desired shape, the blank being a little longer than the front shell into which it is to fit after the oint and catch members are formed thereon.

While being blanked, the width of the plate at 3-3, on opposite sides near one end is reduced slightly, constituting two oppositely tapered longitudinally disposed integral portions 15 and 16, the same being notched as at 4;4. This reduced portion is then placed over the aperture 1'7, of the die 18 and forced by means of the plunger 19 down into said aperture whereby it is drawn up into the form illustrated in Fig. 3, the

same having a rounded top portion 6 and as is usually the case. After the socket isformed, an elongated hole 5 is made through the wall thereof through which the pintongue is designed to extend.

When stock is drawn up into the completed form the little notches 4-4 in the edge of the cut-away portion serve to form a little central hole 10 through which the pivot pintle may be passed and secured, if desired, but I preferably force the stock around this small central hole inward, as illustrated at 11 in Fig. 5, thereby forming a trunnion out of these side walls on which the pin-tongue is pivotally held.

By my improved construction this oint member is formed a little narrower than the back plate on which it is constructed for two reasons, first, the front plate is permitted to be rolled continuously or uninterruptedly around this oint member, as illustrated by the dotted lines in Fig. 4. Another reason for forming the housing of this joint member narrower than that of its plate'is so that its side walls 88 will engage and support the loop or pivoting portion of the pin-tongue from lateral motion. It is found in practice that by forming the outer peripheral walls of this member with a circular contour lends to the houslng great strength and resists its tendency to open as the pin stem is pressed to its closed position over the fulcrum point at 12.

Fig. 8 illustrates a modification in which the outwardly extending end portion 13 is removed and the roll of the front plate extends close up against the rear wall of the joint.

By constructing the pin-tongue-carryingplate of a strip of metal which is folded into a loop form at a point intermediate its ends, the portion of the plate which forms the socket member of the joint is not materially reduced in thickness during the operation of making it as would be the case if the socket were drawn or punched in a flat plate having edge portions remaining in the same plane as the rest of the plate. In the present structure the edge portions of the strip are closed in toward each other so as to form the sides of the socket loops, resulting in the socket member of the joint being somewhat dome-shaped with flattened sides, the inner surface of which guides the fiat sides of the coiled end of the pin-tongue when a pin-tongue substantially of the type illustrated is employed.

I claim:

The process of forming a joint member for pins which consists in cutting the blank, forcing outward from the plane of the blank a portion intermediate itsends whereby the blank is shortened lengthwise, folding the side wall edges of the outwardly pressed portion toward each other until said edges meet, thereby forming a socket loop for the reception of the pin-tongue head, and forming a hole in the wall of said socket through which the pin-tongue is adapted to project.

In testimony whereof I affix my signature in presence of two witnesses.

SIGMUND FISCHER.

Witnesses:

HOWARD E. BARLoW, E. I. OGDEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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