US1146957A - Heading device. - Google Patents

Description

J.'C. ROACH.

HEADING DEVICE.

APPLICATION FILED mm, 1913.

Patented July 20, 1915.

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JOSEPH C. ROACH, OF FAIRI-IAVEN, MASSACHUSETTS, ASSIGNOR T0 ATLAS TACK COM- PANY, OF FAIRHAVEN, MASSACHUSETTS,

A CORPORATION OF NEW' JERSEY.

HEADING DEVICE.

Specification of Letters Patent.

Patented July 29, 1915..

To all whom it may concern Be it known that I, JOSEPH C. RoAcH, a citizen of the United States, and resident of Fairhaven, in the county of Bristol and State of Massachusetts, have invented cer-,

t ain new and useful Improvements in Heading Devices, of which the. following is a specification.

The object of the present invention is to provide an improved device for forming heads on shanks, as, for eXample, on nails, tacks and rivets.

The invention is embodied in a device comprising a die in which one end of a shank is inserted, and means for upsetting the end of the shank while it is in the die to form the head, to the end that the rim of the head shall be circular and of the same diameter as the bore of the die.

Of the accompanying drawings: Figure 1 represents an elevation, partly in section, of certain parts of a tack-forming machine of well-known construction, the same being provided with my improved heading device. Fig; 2 represents, on a larger scale, a section of certain portions of the structure included in Fig. 1. Fig. 3 represents a section on the same scale as Fig. 2, showing the tack-forming instrumentalities. Fig. 45represents a top plan view of the devices included in Fig. 3. Fig. 5 represents a top plan view of a modification of the device, in which is included a spring-retaining device whereby the spring is held under compression when the device is detached from the machine.

The same reference characters indicate the sameparts wherever they occur.

The blank 10 to be formed into a tack is held by and between two dies 1.1 and 12 with its right-hand end protruding from the dies. These dies are closed by suitable Wellknown mechanism (not shown) with suflicient pressure to hold the blank securely so that it will not slip when the heading device, hereinafter described, is brought to bear upon the end of the blank.

The usual heading lever is indicated at 13 and is movable about. the axis of a fulcrum 14. My invention is embodied in the heading device carried by the lever 13. a

The heading device comprises a heading pin 15 and die 16. The die 16 is bored for the reception of the pin, the diameter of the bore and of the pinbeing determined acmeans. Fig. 1 shows portion of the lever toward the gripping dies.

heading die 16, the latter rested thereby. The lever cording to the desired diameter of the head which is to be formed on the tack. The die s carried by a sleeve 17 which is mounted in a block 18 and'is movable longitudinally in the block. The block is mounted rigidly upon the heading lever 13 by any suitable a bolt 19 threaded in a 13 and bearing upon the block 18 to bind the latter to the lever.

The sleeve 17 extends entirely through the block and is provided with a head 20 which is adapted to abut against the right-hand end of the block. Heading pressure is imparted to the pin 15 by a driver 21 in the form of a rod. This rod has a sliding fit in 'the sleeve 17, and its right-hand end extends beyond the head 20 and abuts against a suitable adjustable abutment here shown as a setscrew 22. "This screw is threaded in a portion of the lever 13 and through it the lever is adapted to act positively upon the rod 21, which in, turn is adapted to act upon the heading pin 15 to upset the protruding end of the blank 10. A helical spring 23 engaging the head 20 is compressed between the head and an abutment 2st threaded on the setscrew 22. The function of the spring is to keep the. die 16 against the dies 11 and 12 when the heading pin is acting upon the blank 10, but is adapted to permit the sleeve 17 to yield. relatively to the heading lever when the die is brought to bear against the gripping dies 11 and 12.

In practice, the setscrew 22is adjusted to give the heading pin 15 the desired range of movement, and the abutment 2% is then adjusted to compress the spring 23 to the desired degree. lVhen the heading die 16 is retracted from the gripping dies 11 and 12, the head 20 bears against the holder 18, thus causing the left-hand end of the heading die to extend an appreciable distance beyond the left-hand end of the heading pin 15. lVhile a blank 1.0 is held in the desired position by the gripping dies 11 and 12, the lever 13 is actuated to carry the heading device After the protruding end of the blank has entered the engages the gripand its movement is ar- 13 continues, distance to cause ping dies 11 and 12 however, to move a short blank, which is thereupon flared as far as the heading pin 15 to upset the end of the the die holder? The head 20 of the die holder is again engaged bya helicalspring 23. This spring is held compressed by a collar 25which is adjusted to vary the compression of the spring by screws 26 connecting the head 20 and collar 25.v The heads of these screws have bearings in thecollar, and their shanks are threaded in the head 20, the collar being confined by the headsof the screws and being adapted to slide along the shanks. The setscrew 22 acts, as before, against the rear end of the rod21l The rear end of the rod is in this form screwthreaded asindicated at 27 and isp'rOVided' with anut 28 which bears against the collar 25 to keep the heading die'norinally advanced throu h the medium of the s rin 23. The rod 21 extends loosely through the collar,'the collar being free to move'relatively to the rod when the screws 26 are adjusted to vary the compression of the spring. The spring and its coacting elements are thus embodied in a self-contained group of parts whereby the spring will be held under compression when the device is detached from the operating lever 13.

The heading device in both offthe' forms shown is superior to the heading devices hitherto employed for the same purpose. One of its advantages is that "the heading die is rigidly secured to a holder which has a long sliding bearing in its support,thus insuring accuracy of register between the heading die and the shank to be headed, and also insuring long use and little wear of the sliding parts. Another advantage over the prior art is that a heavy spring 23 may be employed for holding the die' in operative position. The design of the present device" permits the use of a spring'asheavy as desired, and the design also permits varying the compression of the spring. In order to prevent the formation of a'bur on the head of the nail or tack, it is necessary to hold the heading die against the gripping dies with considerable force' Hitherto, the de vices for this purposehave notbeen suflicient in this respect; but the present device effectively prevents the formation of" burs, because 1t permits the use of a heavy spring and provides means for adjusting the compression thereof.

I claim: 1 I 1. A heading device comprising a heading die and heading pin arranged to doact," a holder for said die and pin,'said die bein g secured to said holder, a bearing member for v the exterior of said holder, said holder being m unted to slide; in said memberfrneans guided by said die holder for acting against said heading pin to exert heading pressure, and yielding means for acting against said die holder to keep the die'in' operative position.

2.1 A heading device comprising a heading die and heading pin arranged to coact, a driver for said pin, a guide member for said driver, said die being afiixed to said guide member, a'support in which said guide member is arranged to slide, means for transmit ting heading movement to said driver, and yielding means for acting upon said guide member to keep said die in operative position.

3; A heading device comprising a heading die and heading pin arranged to coact, a driver for said pin, a guide member for said driver, said die being afiixed to saidguide member, a supportin which said guide member is arranged to slide, means for transmitting headingmovement: to said driver, an

abutment carried by said means and adjustable thereon toward and from sald guiding member, and ahelical spring compressed,

between said abutment and guidingmember for keeping said die in operative position, said abutment being adjustable for varying the pressure imparted to said die.

4. A heading device comprising a heading die and" heading pin arranged to coact, a

sliding sleeve, a bearing support forv said to act against the opposite end of said die holder, a spring retainer slidably connected to said die holder for holding saidsprlng under compression against the die holder, a

heading pin arranged to coact with said heading die, means'for exerting heading pressure against said heading pin, and means carried by said pressure meansfor acting against said springretainer to keep the heading die in operating position.

In testimony whereof I have aiiixed my signature, in presence of two witnesses.

J OSEPHCLROAOH. Witnesses:

A.D.BU11 INtroN, E.- M. BURGESS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents; Washington, D. 0.

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