US1093398A - Machine for manufacturing spring-headed nails. - Google Patents

Description

F.GOLD[ MACHINE FOR MANUFACTURING SPRING BEADED NAILS.

APPLICATION FILED JUNE 17, 1913/ 1,093,398. Patented Apr.-14,191 L frbmeizzar QFGOZdL hurrah sra'rns ra'rnnr oriucn.

FRANK GOLD, OF RICHMOND, VICTORIA, AUSTRALIA.

MACHINE FOR MANUFACTURING SPBING-HEADED NAILS.

oesses.

of Victoria, Commonwealth of Australia,

have invented certain new and useful Improvements in Machines for Manufacturing Spring-Headed Nails, of which the following is a specification.

This invention relates to the manufacture of nails of the type having a concavo-convex washer, galvanized or otherwise secured in position beneath the head of the nail shank thereby providing a spring headed nail.

At present a common practice in making wire nails is to first feed a short predetermined amount of the wire from which the nails are formed through a die formed with two jaws one of which is adapted to open from the other to permit a predetermined length of the wire to pass. It then closes and grips the wire. A punch then flattens or expands the short length of wire to form the nail head. The punch then recedes and the wire is fed onwardly through the die to provide the nail shank. Cutters are adapted to now out and point the length of wire last fed, which completes the nail. The cutters sever and point the wire at a point beyond the die, thus leaving a short projecting length which the punch flattens or expands in the neXt cycle of operations to form a11- other nail head. i

A usual practice has been to form the spring washers for use with the nails by another machine and to place or thread them upon the nails by hand. hen a washer has been placed beneath the head of a nail shank the two are treated in a galvanizing bath which retains the washer to the shank head, the resultant product being a nail with a concavo-convex spring head. On account of the multiplicity of operations such a method obviously wastes considerable time and labor.

The object of the present invention lS tO so equip a nail making machine that it will, in addition to making the nail, also form the spring washer therefor and position it upon the nail shank. By the invention, therefore, the nail and its washer are formed and assembled in the one machine and the invention consists broadly in making the Washer, positioning it upon the wire which is to form the nail shank, and then forming the head of the shank.

Specification of Letters Patent.

Application filed June 17, 1913.

Patented Apr. 14:, 191a. Serial No. 774,250.

According to the invention a strip of metallic tape is intermittently fed into a machine between the punch and the die thereof and the punch and die are of such a conformation that a concavoconvex washer is stamped from the tape with each inward movement of the punch. The arrangement is such that the shank of the nail being formed penetrates through the washer and has a head formed by the punch after such penetration.

Referring to the drawings which form a part of this specification :Figure l is a plan showing in broken lines, well known elements of a nail making machine. In full lines are seen elements by which this invention may be carried into effect. The positions of the nail making elements are those assumed when a nail has just been completed, the punch having receded and cutters having moved inwardly. Fig. 2 is a detail view showing an intermediately pivoted lever and a ratchet wheel operated thereby to feed the tape from which the spring washers are formed. Fig. 3 is a side elevation showing another manner of feeding the tape. Fig. 4 is an enlarged detail view of a die and punch according to this invention. Fig. 5 is a view of a nail manufactured according to this invention.

The nail making machine includes a crank shaft 2. Pivotally connected to the crank pin of the crank of the said shaft is one end of a connecting rod 3, the other end of which is connected to one end of a reciprocating slide 4:, provided with two cam surfaces 5. Situated at the other end of the reciprocating slide is a punch 6. These elements are all well known.

Formed in the inner end of the punch, according to this invention, is a concave washer chamber 7 Also formed in the said punch and in the washer chamber is a concave shank head chamber 8. The precise conformation and area of these chambers may vary, being dependent upon the size and type of nail manufactured.

Upstanding from the framework of the machine, at each side of the reciprocating slide l, is a pivot pin 9. Intermediately pivoted to each pin 9 is a lever 10, having mounted at one end a roller 11. Each roller 11 engages with a cam surface 5. At the other end of each lever 10 is situated a cutter 12. The cutters slide in suitable guides and may be controlled as also may each lever 10 by a spiral or the like spring. The levers, rollers and slides are common to most nail making machines. Adjoining the punch 6 is a die consisting of two jaws 13. One of the jaws 13 is stationary and the other adapted to open or move away therefrom as is usual. Formed in the jaws is a wire passageway 1a. The die as described is also common to nail making machines. Project ing from the jaws of the die, according to this invention, is a convex washer protuberance 15. Also projecting from the jaws of the die is a circumferential step or shoulder 16 having a shearing edge 17. Between the protuberance 15 and the step or shoulder 16 is an annular recess 18.

According to the present invention, in addition to the novel punch and die, there may be attached to the slide at a tappet arm 19 having a friction roller 20. The tappet arm 19 may be adjustable in relation to the slide 4 in any known manner. Intermediately pivoted by a pivot pin 21, carried by the machine framework, is a lever 22 situated below the tappet arm roller 20. Upstanding from the lever, at one side of the pin 21, is a cam surface 23. This may be adjustable in relation to the lever 22 in any well known way. Carried by the lever, at the other-side of the pin 21, is a pivoted pawl 24 engaging with a ratchet wheel 25, mount-' ed upon a shaft 26. Mounted upon the shaft 26 is also a driving friction roller 27 adjoining which is an idle friction roller 28, mounted upon an idle shaft 29. Attached to the framework or otherwise retained in position above the friction rollers 27 and 28 is a tape guide 30. This may be of any desired character. Adjoining the friction rollers is a leading pulley 31 mounted upon a shaft 32.

Above the punch and die is a tape spool 33 mounted upon an idle spool shaft 3 1. Accommodated by the spool 33 is a tape 35. This passes around the leading pulley 31, around the friction roller 27 and between the same and the idle roller 28. It then passes upwardly through the tape guide 30 (as shown in Fig. 3).

Instead of operating the ratchet wheel 25 and friction roller 26 by means of a tappet arm 19 and intermediately pivoted lever 22 an eccentric 36 may be provided upon the crank shaft 2 and by a connecting rod 37 oscillate an arm 38. The lower end of the arm loosely embraces the shaft 26. Pivoted to the arm is a pawl 39 engaging the ratchet wheel 25.

With this invention, the wire from which the nails are to be formed, is first placed in position in the die 13 with a short length of the said wire projecting outwardly from the said die. Upon the crank shaft rotating, the connecting rod 3 and reciprocating slide 1, move the punch 6 inwardly as is usual. As the slide 4 moves inwardly the roller 20 of the tappet arm 19 engages the cam surface 23 and depresses the intermediately pivoted lever 22 at one end. The pawl 24 is thereby raised partially rotating the ratchet wheel 25 and shaft 26. In the construction shown in Fig. 3 as the crank shaft 2 rotates the eccentric 36 connecting rod 37 and lever 38 will, by the pawl 39 and ratchet wheel, partially rotate the said shaft 26. As the shaft 26 rotates, the friction roller 27 also rotates and moves the tape 35 upwardly through the guide 30. The tape is now interposed between the punch and the die and as the said punch moves inwardly it stamps a washer from the said tape. As the punch continues to move inwardly the washer assumes the conformation of the chamber 7 and protuberance 15. The wire projecting from the die pierces the washer during such operation and enters the charm ber 8. As the punch still further moves toward the die, the wire within the chamber 8 is spread or expanded forming the shank head in the usual manner. the reciprocating slide at now commences to recede from the die and by the cam surfaces 5 and rollers 11 moves the cutters 12inwardly. As the punch recedes, by any suitable mechanism common to nail making machines, the die opens and the wire from which the nail is being formed passes through the said die and follows the direction of travel of the punch. hen the wire has moved a predetermined amount, the die closes and grips the wire. The cutters continue to move inwardly and sever the wire, the nailbeing now completed and falling by gravity from the machine. The washer 40, as seen in Fig. 5, is situated upon the shank 11 of the nail and beneath the shank head 42. It is only necessary to pass the washer and nail through a galvanizing bath to unite the said washer 40 with the shank head 42, the resultant product being a spring headed nail. Any suitable guides or other means may be employed to divert any surplus material after the washers have been stamped from the tape 35.

It is to be understood'that other mechanism may be employed for feeding the metallic tape 35 between the die and the punch at the correct moment, the two embodiments shown being illustrative only. The washers need not necessarily be stamped from a tape or strip and the blank material may obviously be fed downwardly instead of upwardly or in any other direction dependent upon circumstances.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a nail making machine, the combination of a frame, a nail stem die formed at its end with a flange receiving recess, a

The punch by punch having a recess corresponding to the shape of the recess in the end of the die, the center of the recess in the die being deepened to form a seat for the head of a nail, means for interposing a strip of metal from which the flange of the nail is to be formed between the die and the punch, means for moving the punch into engagement with the die and forming a flange from the interposed strip and causing the end of the nail stem to be forced through said flange and into the deepened recess and formed into a head on the outside of the flange.

2. In a nail makin machine, the combination of a die comprlsing a stationary part and a movable part to hold and clamp a rod, the end of the latter projecting beyond the free end of said die, means for interposing and holding a strip of metal in front of the projecting end of the rod, said die having a flange receiving recess in its free end, a punch formed with a recess corresponding to the shape of the recess in the end of the die, the center of the recess having a central depression, and means for moving the punch toward the die and forcing the strip against the rod, the latter piercing the strip, and the subsequent movement of the punch severing the strip to form a flange and upsetting the end of the rod on the outer surface of said flange.

8. In a nail making machine, the combination of a nail die formed in its end with a flange receiving recess, means for introducing a stri of metal in front of the recess in the die, a punch formed with a recess corresponding to the recess in the end of the die, the center of the recess in the punch being deepened, centers for severing the metal operated upon by the die, means operated by movement of the punch for operating the cutters, and means for operating the cutter, whereby the strip will be forced on the nail stem held by the die and the recesses will simultaneously formaflange on the stem and the end of the latter will be headed on the outside of the flange.

4. In a nail making machine, the combination of a nail stem die formed in its end with a recess and a cutting edge surrounding the recess, means for introducing a strip of metal in front of the die, a cross head, a punch extending from the cross head and formed at its end with a recess corresponding to the recess in the end of the die, said recess in the punch being centrally deepened, cams on the side of the cross head, pivoted levers in engagement with the cams and operated thereby, cutters carried by the pivoted levers and operable to sever the stem of the nail adjacent the die, and means for reciprocating the cross head to operate the punch to force the strip of interposed meta-l against the stem and cause the latter to penetrate said strip, and sub sequently force the strip into the recess in the die and sever same to form a flange, and simultaneously upset the outer end of the stem on the outside of the flange.

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

FRANK GOLD. \Vitnesses:

ADELAIDE JAMIESON, DAPI-INE GLAnYs HANSON.

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

Washington, D. 0.

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