US87780A - Improvement in bolt-heading dies - Google Patents

Description

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Maaaww j INIPROVEMENT IN BOLT-HEADING- DIES.

The Schedule referred to in these Letters Patent and making pax-t:` of the sarl-ne.

To all whom it 'may conce/mr Beit known that I, JOSEPH KAYLOR, of Pittsburg, in the county of Allegheny,and State of Pennsylvania, have invented a new and useful Improvement in the Manufacture of Bolts; and I do hereby declare the following to be a full, clear, and exact description thereof,

-reference being had to the accompanying drawing, making a part of this specification, in which- -Figure 1 is a perspective view of a bolt-machine fitted with my improved dies, and illustrative of their operation;

Figure 2 is a vertical cross-section through the griping-dies, just in the rear of the bottom of the recess in which the bolt-head is formed; and x Figures 3 to 6 are perspective views of various forms of dies illustrative of my improvement.

Like letters of reference indicate like parts of each.

My invention relates to the construction of dies for bolt-heading machines, and more particularly to that class of dies, which, by a second or subsequent stroke, when the partly-formed bolt-head is turned part way around, work in the flash, or ire, made at the first or a previous stroke; and

The nature of it consistsin making the heading-side of the dies with a double recess, the inner recess being of the size and shape of the bolt-head to be made, 'and the outer recess being larger than the inner recess on two sides, which two sidesmay be either adjacent or opposite to eachother, the two remaining sides of the larger recess being ush with the corresponding sides ofthe inner, or bolt-head recess. The Hash, or fire, is then formed on the edges of the bolt-head, next the open sides of the outer recess, so that the bolt-head being turned part way around for another stroke of the dies, the dash, or fire, will come next the sides of the outer` recess, which are flush with the sides of the inner, or bolt-head recess, hywhich, and-the heading,

such ash, or ire,'will be worked into the`head.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and mode of operation.

Ajs the frame of the machine;

" B; the cam-shaft; and' C and C', cams, which are so set that the one, O', shall operate a littlein advance of the other, C.

D is a stationary, and

D', a movable die-block, though both may be movable, if so preferred.

In these are set the griping or side-dies (l d.

b is a `heading-die, actuated by the cam C, through the stem b. y

f is a like stem, which, operated by the cam O', gives the die-block D and its die d a forward stroke.

The diefdreceives its return-stroke from a spring, g, and-the headerib is carried back by a like spring o r other equivalent device, attached at any suitable point.

A is an aperture in the frame, through which the bolt-,rod,fprope11y heated, is fed in.

The griping-dies d d have the usual cavities, i, for the shank of the bolt.

In the several igures, e represents the inner, or bolt-j. head recess, half .of it being made in each die, and in such a way that when the two dies come together, the inner recess so formed will give the proper cavity for a square 'bolt-head, as in flgs. 1, 2, and 5, or a hexagonal bolt-head, as in g. 3, or a Thead, as in iig. 6.

The half recess o in each die may be triangular, as in figs. 1 and 2, or rectangular, as in fig. 5.

An outer recess, e, is `made in each die, the bottom of which is even with the top of the inner recess.

This recess e, or these recesses, are so made, that `when the dies come together, an open 'space shall be left on at least two sides of the inner, or bolt-head recess o.

Such open sides may be adjacent to each other, and must be for T-headA bolts, as in iig. 6, or they be opposite to each other, as in figs. 1, 2, 3, and 5.

The remaining sides of the outer cavity e are made flush, or even with the corresponding sides of the inner cavity c, as in all the figures except fig. 4, which shows a pair of dies with the outer recess e open, or enlarged on all sides, around the inner recess, or cavity c.

The header b is made of the size and shape to t the outer, or larger recess e, and receives, from its cam, C, a stroke such as to bring its working-face, in heading a bolt, even with the top of the inner cavity c.

The face of this header b may be concave or have other desirableform, so asto make the top face of the bolt-head dat, convex, or otherwise, at pleasure.

The rod from which the bolt is to be formed, being.

heated, is introduced, between the griping-dies dd', through the aperture A suciently far, so that enough metal shall project through to form a bolt-head of the required size. The griping-dies then catch the rod by the semi-cylindrical cavities, when the header b comes forward, strikes the end of the rod, and upsets a head in thelower recess c. The dies then open; the bolt, if

square, is turned one-fourth way around;9if hexagonal,

'one-sixth; if rectangular, or of Tlshape, one-half, Sto.;

and the dies, by another stroke, work into the head any flash, or fire that may have been formed on the head at the'previous stroke. The bolt being cut off, the bar is then complete, and the operation is repeated.

It will be observed, that with the construction of dies shown and described, any part of the bolt-head on which a flash, or fire, can be formed at the first stroke of the dies, will, on the turning of the bolt as described, at the next succeeding stroke of the dies, come against a solid face of some one of the dies. Thiswill prove the case in reference' to all, except the T-head bolt, shown in iig. 5, and in that the only exception will be -as to the ash, or re, if any, which may be formed at the part of the rolls. But, in all the dies shpwn, the flash, or re,wi1l be formed solely, if not exclusively, on the edges of the upper face of the bolt-head, which arenext the enlarged, or open part of the upper recess e,

and' every flash, or fire there formed, will, on the turning of the bolt, come against the opposite faces-ofthe upper recess, which are Hush with the corresponding faces of the lower recess c.

I have described the outer recess as being enlarged, or open on two sides of the inner recess, but in dies for making a hexagon bolt-head, as in g. 3, the outer recess should be open, or enlarged around half the periphery of such recess.

I am aware that it is not new to turn a partly-formed bolt one-quarter way around to Work in the flash, or re; also, that bolt-heading dies have been so made that a flash, or re, formed on an57 part of the head, would, at a subsequent stroke of the dies, on thel head being turned one-quarter of' the way around, come in contact with a solid face of' one ofthe dies. I, hence, do not claim these features as applied broadly to boltheading dies of substantially a different construction fromy that above described; but

What I do claim Aas my invention, and desire to se- 4cure by Letters Patent, is-

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