US2120649A - Machine for making capped nut blanks - Google Patents

Description

June 14, 1938, l V H. ROSENBERG v 2,120,649

MACHINE FOR MAKING CAPPED NUT BLANKS Original Filed May 21, 1935 4 sheeifisheet-l H. ROSENBERG MACHINE FOR MAKING CAPPED NUT BLANKS Original Filed may 21, 1935 4 Sheets-Sheet 2 June 14, 1938. H, ROSENBERG 2,120,649

MACHINE FOR MAKING CAPPED NUT BLANKS Original Filed May 21, 1935 4 Sheets-Sheet 3 adorn u 5 nvelnboz June 14, 1938. H. ROSENBERG 9 5 MACHINE FOR MAKING CAPPED NUT BLANKS Original Filed May 21, 1935 4 Sheets-Sheet 4 I DEF. iii:

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zi/fif/W ""1 HEY/7A Emma 552a J2 .9/ Z Z8 3/ 32 Patented June 1 4, 1938 UNITED "STATES PATENT is Heyman Rosenberg, New York, N. Y.

Original application May 21, 1935, Serial No. 22,593, new Patent No. 2,090,641, dated August 24, 1937. Divided and this application .ilune 18, 1937, Serial No. 148,895

9 Claims.

ll apparatus for die-forming capped nut blanks from either slugs or sheets of metal. Briefly the method, which is both disclosed and claimed in said application, involves die-forming a slug or disc of metal into a thimble-like shell or blank, and then die-forming-the thimble-like blank to convert it into a blank having the proper external and internal configuration of a finished, but unthreaded, capped nut.

The said application also discloses but does not claim three machines used in practicing the claimed method; namely, a machine for forming the thimble-like blanks from slugs of metal, a machine for forming the thimble-llke blanks from a sheet of metal, and a machine for converting the thimble-like blanks into unthreaded capped nut blanks. The present application is concerned with the first of these machines, the one which forms thimble-like blanks from slugs of metal.

It is an object of the present invention to provide a machine capable of die-forming thimblelike blanks from solid slugs of metal.

It is a further object of the invention to provide a machine for die-forming thimble-like blanks from solid slugs of metal without substantial waste of material It is a still further object of the invention to provide a machine constructed and organized to form thimble-like blanks rapidly andefiectively and in an automatic manner from wire stock fed into the machine, with substantially no other attention or supervision than the occasional placing of a fresh reel of wire stock in position to be fed to the operating instrumentalities of the machine.

To these ends, a very advantageous and practical form of machine embodying the invention desirably consists of a double stroke standard header, embodying instrumentalities enabling the machine rapidly and automatically to convert slugs of metal into thimble-like blanks by a succession of die-forming operations performed upon each blank. The machine desirably includes means for intermittently feeding wire from a 50 wire reel through steps of measured length, and mechanism for severing a slug of metal from the leadng end of the wire after each wire feeding step and for transferring the severed slug to alinement with a stationary, female, forming die. A double stroke reciprocating plunger, operating (6i. ill-'26) in timed relation to the slug-severing and transierring mechanism, carries two forming dies for cooperating with the female die at alternate forward strokes of the plunger. The first or preliminary forming die thrusts the slu into the 5 female die and shapes it exteriorly to substantially the contour of the female die to form one end of the slug to substantially the dome shaped contour of the finished blank. The preliminary diealso forms a central recess or depression in it the end face of the slug which it engages. The second forming die, which is the finishing die, carriesa finger for die-forming the interior cavity of the blank. The blank is carried away from the female die upon the finishing die and is then 15 carried forward, out of alinement with the female die, at the non-forming stroke of the finishing die. A stripper is provided for engaging behind the thus advanced blank and stripping blank j from the finishing die as the die recedes.

Other objects and advantages will hereinafter appear.

In the drawings forming part of this specification and illustrating an advantageous and prac-\ tical embodiment of the invention Figure 1 is a view partly in side elevation and partly in vertical section of a double stroke header embodying features of the present invention;

Figure 2 is a view in elevation, partly broken away, of a piece of work material, such as a fragv ment or slug severed from wire stock, which is converted through the instrumentality of the present invention into a thimble-like shell;

Figure 3 is a longitudinal sectional view through such a slug as that illustrated in Figure 2 at the conclusion of the first or preliminary form ing operation;

Figure 4 is a longitudinal sectional view of the blank of Figure 3 after the second or finishing forming operation;

Figure 5 is a view partly in plan and partly in horizontal section of the header of Figure l. the parts being shown on a scale somewhat larger than the scale of Figure 1;

Figure 6 is a fragmentary, detaile view showing the plunger dies of Figures 1 and 5 in elevation and other parts in section, the parts being shown in the positions which they occupy at the conclusion of the preliminary forming stroke;

Figure '7 is a view similar to Figure 6, but 50 showing the parts in the positions which they occupy at the conclusion of the finishing forming stroke;

Figure 8 is a viewin front elevation of the die block and stripper means, parts being broken its away-and shown in section for disclosing otherwise concealed parts;

Figure 9 is a fragmentary, side elevation of the matrix die block showing'the stripper in end view: and

Figure 10 is a horizontal section taken on the plane indicated by the line Ill-Lot Figure 8, and looking inthe direction of the arrows.

As previously indicated, the illustrative machine is a form of standard double stroke header,

having instrumentalities embodied in it for enabling it to convert a slug like that of Figure 2 into a thimble-like blank as shown in Figure 4, by die-forming operations.

It is, of course, well understood in the industry that a header is a machine for forging enlargements on the ends of wire or rod blanks in the course of manufacturing nails, screws, bolts, and like fasteners. One of the earlier and simpler forms of such headers is seen more or less diagrammatically in the patent to T. Ferry, No. 1,069,659, dated August 5, 1913. The header shown in the said Ferry patent is of the doublestroke type, that is to say, a forming or matrix die is located to receive material to be treated by two plunger dies, one of which is caused to approach and act upon the material at one stroke of the machine, and then to shift out of line while the other shifts into line and acts on the material during the next stroke. The headers have become somewhat more complicated and more efficient than the illustration in the patent just mentioned, but-the principle generally remains the same in the two-stroke headers. An illustration of a modern and efficient header is found in the product now being marketed by I companying drawings, so much only being illus-' trated as is adapted for facilitating disclosure of the present invention. Detailed description of parts that are thus commonly known and are not directly modified by the r esent invention is omitted as not needed.

Referring to the drawings by numerals, the apparatus seen in Figures 1 to 10 inclusive consists essentially of a header having the usual pitman 1 journaled on an actuating crank and pivoted to impart the requisite thrusts to the die block 2. A plunger slide 3 is carried by the die-block 2 in position'to slide vertically thereon, or across the rectilinear horizontal path of the die block 2 while being carried thereby and receiving its thrust therefrom. A punch holder 4 is mounted on the plunger slide 3 and carries the punches or plunger dies 5 and 6 which are spaced vertically apart. An appropriate appa ratus, such as a crank i and its connected parts, imparts timed, vertical shifting movement to the plunger slide 3 to cause the punch or plunger die 5 first to operate and then to move up out of line, and then the punch 'or plunger die 6 to operate.

Of course, the parts just described are appropriately mounted in a suitable bed or framework plunger dies 5 and I spaced from the cooperating, opposed matrix die 0. At one side of the die 8 is a cut-off die 8 and a laterally reciprocating cutter bar Ill (corresponding to cutter ll of said Petitjean patent) with which cooperates the spring-stressed clamping finger ll carried by the fiddle how (not shown but seen at i'l in said Petitjean patent, finger-II corresponding to finger 2| of said patent) for clamping the material severed by the bar I0 against the bar while the bar is moving into line with the die 0. A reciprocating cutter slide i2 (corresponding to slide B of the, Petitjean patent) carries the shearing bar i0. Slide i2 is reciprocated in timed relation to the action of the die block 2, and the plunger dies 5 and 8. Thus, shearing bar i0 successively severs a slug or blank from a supply of wire or rod fed through die 9, moves the slug over to alinement with matrix die 8, with the cooperation of finger ll, releases the blank or slug, and returnsto cut 011- the next blank or slug in timed relation to the movements of the other cooperating parts.

In nail making headers, the die corresponding to die 8 is the heading die, and appropriately recessed punches are carried by the punch holder 4 to cooperate with the blank in the heading die. According to the present invention, however, the punches or plunger dies 5 and 8 are not the ordinary heading cone punches but are especially constructed and incorporate features of the present invention. It will be noted that the die 8 is provided centrally with a recess l3 into which the material of the blank is to be forced in giving the blank its initial and second shapes. To this end. the plunger die 5 is provided with a preferably cylindrical, reduced extension or projection ll terminating in a partiglobular or bulbous extension I5, centrally, axially located. The free end surface of the projection I with the exception of the bulbous part I! is flat, and the projection H is of a diameter to snugly fit within and slide into the die recess I! for effectively forging the slug or piece of work material comprising the blank it of Figure 2 against the inner end and sides of the recess II to substantially the condition seen at l8 in Figured, with the depression I! in its outer end. Irregularity in the original shape of the blank I6 is not objectionable so long as the material is of such contour and quantity that it can be successfully forced into the die recess l3 and there cold forged into the form of a thimblelike shell 20; seen detached in Figure 4.

Whether the work material be a slug, as seen at IS in Figure 2 cut from a supply of wire or rod, or a slug otherwise produced, the slug is held, as by cutter bar I 0 and finger il, in line with the die recess l3 as the die block 2 is concluding the first forward stroke, so that projection H with its rounded extension I! engages the slug and forces it into recess I1 and compresses it sufficiently for cold forging it and causing it to conform substantially to the contour of the die recess l3 and to thus assume the shape I8 of Figure 3. Then the die block 2 recedes and leaves the work material IS in the die recess it.

Before the next advancing stroke of die block 2, the punch slide is shifted upward by the action of the-crank 1 and cooperating parts until the plunger die 8 is brought into line with the die recess l3. Plunger 8 is provided with an axially outstanding shaping finger it which, in the forwardstrokeofidie block 2, enters the recess l3 and enters. the centering depressing IQ of blank Hi, and the further advancing movement of the finger 18 causes the material of blank l8 to be flowed both laterally into more compact condltion, and longiti dinally into greater length, moving outward along the die finger l8 to the position substantially as indicated in Figure 7, so that the work material in the die recess i3 is thus caused to assume the contour seen in Figouter margin or free edge of the thimble 20 as seen in Figure 4, or some slight flattening of the parti-globular or rounded inner end thereof asv in Figure 3 is not of any materiality, such irregularity being effectively corrected in the next succeeding steps of the process.

It is important that the amount of material in the blank or slug, such as seen in Figure 2, be sub- P stantially that required for the completed article.

and it will, of course, be understood that when the slug or fragment of wire, as seen in Figure 2, is employed, the operation begins with the cutting off of the slug from the supply wire or rod seen at El. This supply wire or rod M is passed between the feeding rolls 22 which are part of the standard equipment of the header machine, and the wire or rod is extended through the .cutoff die 9 where the protruding end portion is sev- 1 ered by the cross stroke of the shearing bar ill.

The spring finger ll resiliently stresses the portion being out off against the shearing bar it and continues to frictionally hold the slug after it is severed while the bar it is functioning as a carriage to move the slug over into line with the recess l3.

Properly timed with this movement the plunger die 5 approaches and begins to press the slug i6 into the recess 93, and thereupon bar ill moves back and spring finger ll releases the sing and rides over plunger 5 back to again engage the protruding end portion of wire it. Wire M is of course fed through the die 9 into position for being cut off for supplying the next sing in timed relation to the other movements of the machine. It should be understood that the feeding rolls 22 and .cut-off die 9 (as well as the shearing bar Ill" and spring finger II) are standard equipment of well known types of headers for use in the making of nails, screws, bolts, and the like,

and that the feeder. rolls 22 are provided with.

appropriate adjustment and control devices for feeding forward the desired and requisite quantity only of the wire or rod 2| to be severed by the shearing bar l0. Wire or rod 2| may be steel, copper or other material according to the prodnot desired.

A knock-out pin 23 is part of the standard equipment of a header, and, in the present construction, extends through the die 8 and axially into the recess it, said pin extending through a iii, usually clings to the finger with a frictional engagement requiring the thimble to be stripped from the finger to prepare the finger for the next operation. To that end, the stripping mechanism n seen in Figures 6 to inclusive is provided. As

best seen in Figures 7 and 8, the die engaging block 25 for die 8 is provided with a recess 26 to accommodate the projection H on the second stroke oi the die block 2, the recess 26 being spaced above and in vertical alinement with the recess l3 and centered to correspond with the respective centering of the projection l4 and the finger l8. Ordinarily, in headers of the type shown, the space below the recess l3 corresponding to the location of the finger l8 when projection i4 is in a recess corresponding to recess i3 is merely an open space, but, according to the present invention, provision is made for engaging the thimble 2t on the finger i8 and stripping the same therefrom while beneath the die 8. Accordingly, a detent is provided for the thimble that allows the free movement of the finger. To

this end, an appropriate framework 2? is arranged beneath the die 3 andprovided with slide plates 28, it, each having a semi-circular notch. at its inner end facing the corresponding notch of the other slide plate so as to provide a passageway or opening 29 through which the finger it may freely move. That is to say, the passageway 2% is of a sufilcient diameter to permit free movement of the finger alone through said passageway. The slide plates 28, however, are provided with inclined or conical walls it, 38, leading to the aperture 29, the said walls being proportioned and located during operation to be struck by the rounded or globular end of the 30 stresses each of the slide plates toward the other to keep the ends of the slide plates in abut ment when not forced apart. A guide pin 32 is preferably provided for each spring 3i and extends from frame 2? into and along the respective coiled spring 3i a'distance sufllcient to retain and guide the spring in its movements. Thus, when the die block 2 makes it first stroke,

' the projection it compresses'and shapes the material in the recess l3 and then the die block recedes, the material being left in the recess it. The die plungers b and 6 are then shifted upward until finger i8 is brought into .line with the recess 53, and then the die block 2 makes its second stroke during which the finger i8 enters the recess is and flows the material therein to the thimble-like shape to produce the thimble 20,

as above stated. Then the die plungers 5 and 6 recede and descend to bring the projection ii in line with recess l3 for the next first stroke. However. in making this next first stroke, the finger i8 carrying the thimble 2B causes the rounded end of the thimble to strike the beveled walls 30 and thus wedge the slide plates 28 apart against the stress of springs 3i until the abrupt end of thimble ill, that is the end having the opening of the recess within the thimble, passes the rear faces of the plates is incident to the ,ppening and closing movement of plates 23. Said plates thus become a direct detent'for the thimble 20. With the next return movement of plunger 8, the edges of the thimble strike said detent and a stationary matrix die therein having a dome-shaped cavity," of plunger dies cooperating with the matrix die, one of the plunger dies being shaped to snugly fit within the matrix die 'and having a bulbous extension for producing a centering depression in a slug or mass of metal forced by said plunger die into the matrix die, and the other plunger die having a finger-like extension proportioned to enter the said centering depression and shape the mass in the matrix die into an elongated, domed, thimble-like shell having substantially the same external domed shape as the internal shape of the matrix die cavity.

2. The combination as claimed in claim 1 with means for stripping the thimble-like shell from the finger-like extension as an incident of the non-forming stroke of said extension.

3. The combination as claimed in claim 1 with means alined with and spaced below the matrix die for receiving the finger-like extension carrying a thimble-like shell incident to the stroke of the plunger die having the bulbous extension into the matrix die, the said receiving means for the finger-like extension and shell being resiliently stressed for interposing a detent in the path of the shell for stripping the shell from the fingerlike extension with the return stroke of the latter.

4. In a machine for forming thimble-like capped nut blanks from slugs of metal, in combination, a stationary female die, a double stroke plunger, a pair of plunger dies carried by the plunger, the first being a preliminary forming die for cooperating with the female die to shape a blank at a first or preliminary blank forming stroke, and the second being a finishing die for cooperating with the female die to further shape the blank to thimble-like form at a second or finishing forming stroke, and each having a nonforming stroke with the plunger, out of alinement with the female die, at the forming stroke of the other, the construction and arrangement being. such that a blank placed in the female die is acted upon successively by the plunger dies and is then carried away from the female die by the finishing plunger die, and a stripper formed and mounted to engage the finished blank as the blank is carried forward by the finishing die at the non-forming stroke of said die, and to strip the blank from the die as the die recedes following such non-forming stroke.

5. In a machine for forming thimble-like capped nut blanks from slugs of metal, in combination, a stationary female die, a double stroke plunger, a pair of plunger dies carried by the plunger, the first being a preliminary forming die for cooperating with the female die to shape a blank at a first or preliminary blank form of stroke, and the second being a finishing die for cooperating with the female die to further shape will be carried away from the female die by the finishing plunger die, and a stripper formed and 6. In a machine for forming thimble-like capped nut blanks from slugs of metal, in combination, a stationary female die, a double stroke plunger, a pair of plunger dies carried by the plunger, the first being a preliminary forming die for cooperating with the female die to shape a blanket a first or preliminary blank forming stroke, and the second being a finishing die for cooperating with the female die to further shape the blank to thimble-like form at a second or finishing forming stroke, and each havi mg a nonformlng stroke with the plunger, out of alinement with the female die, at the forming stroke of the other, the construction and arrangement being such that a blank placed in the female die is acted upon successively by the plunger dies and is then carried away from the female die by the finishing plunger die, and a pair of laterally yieldable stripper members formed and mounted to be engaged and cammed apart by a finished blank carried forward by the finishing die at the non-forming stroke of said die, and to engage behind the blank and strip it from the die as the die recedes following such non-forming stroke.

7. In a machine for forming thimble-like capped nut blanks from slugs of metal, in combination, a stationary female die, a double stroke plunger, a pair of plunger dies carried by the plunger, the first being a preliminary forming die for cooperating with the female die to shape a blank at a first or preliminary blank forming stroke, and the second being a finishing die for cooperating with the female die to further shape the blank to thimble like form at a second or finishing forming stroke, and each having a nonforming stroke with the plunger, out of alinement with the female die, at the forming stroke of the other, the construction and arrangement being such that a blank placed in the female die is acted upon successively by the plunger dies and is then carried away from the female die by the finishing plunger die, and a pair of laterally yieldable stripper slides formed and mounted to be engaged and cammed apart by a finished blank carried forward by the finishing die at the non-forming stroke of said die, and to engage behind the blank and strip it from the die as the die recedes following such non-forming stroke.

8. In a machine, for forming thimble-like capped nut blanks from slugs of metal, in combination, a stationary female die having a domeshaped cavity therein, a double stroke plunger, and a pair of plunger dies carried by the plunger, the first being a preliminary forming die for cooperating with the female die to shape a blank at a first or preliminary blank forming stroke, and the second being a finishing die for cooperatingwlth the female die at a second or finishing forming stroke to further shape the blank to a domed, thimble-llke form having an external contour substantially the same as the domeshaped cavity of the female die and having an internal contour substantially the same as the external contour of the finishing die.

9'. In a machine for forming thimble-like capped nut blanks from slugs of metal, in combinatlon, a stationary female die having a domeshaped cavity therein, a double stroke plunger, and a pair of plunger dies carried by the plunger, the first being a preliminary forming die for 00- operating with the female die to shape a blank at a first or preliminary blank forming stroke, and the second being a finishing die, having a rounded leading end, for cooperating with the female die at a second or finishing stroke to further shape the blank to a domed, thimble-like form having an external contour substantially the same as the dome-shaped cavity of the female die and having an internal contour substantially the same as the external contour of the finishing die. n

HEYMAN ROSENBERG.

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