US49524A - Improvement in machines for cutting threads on bolts - Google Patents

Description

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I UNITED STATES TENT (Mnch. I l

W. W. HUBBARD, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN MACHINES FOR CUTTING THREADS ON BOLTS.`

Specication forming part of Letters Patent No. 49,524, dated August 22, y1865. i

To all whom 'it may concern Be it known that I, 'W. W. HUBBARD, of Philadelphia,Pennsylvania, have invented certain Improvements in Bolt-Cutting Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters ofreference marked thereon.

My invention consistsof certain novel mechanism, fully described hereinafter, for cutting the screw-threads of bolts with rapidity.

In order to enable others skilled in the ait to make and use my invention, I will now proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of this specification, Figure 1 is a sectional elevation of my improved boltcutting machine; Fig. 2, a plan view, and Figs. 3, 4, and 5 detached views.

Similar letters refer to similar parts throughout the several views.

A represents part of the frame of the machine, in which turn any number of horizontal spindles B. At the outer end of each spindle is a cylindrical block or head, C; in which, at

, equal distances from each other, are hung three levers, D D D, each of the latter being connected by a link, a, to a sleeve, E, arranged to slide on the shaft B. A pin, c, passes through the sleeve E and through a slot, x, in the shaft, so that the sleeve shall turn with the shaft. Against the piu c bears the inner end of a rod,

` "e, which slides freely in an opening inthe center of the head C. In the said sleeve is an an-` nular groove, d, into which project the branches of a forked lever, F, hinged to a bracket, G.

` Between guides H H, in front of each head a; carriage, I, to a hand-lever, J, at y f which are hung two pawls, f, each of the` attori` being adapted to the teeth of a rack, g,`at,t under side of one of the guides H. Fromt et carriage I a plate, h, projects downward, infwhich plate is an openin g for the admission of afrod, K, the latter being jointed at its inner end to the lever F and bent at its outerendy,as\show1n in Fig. 3. To the plate h is securedloneendjof a cord, fi, which passes over a pulleyi L, andis secured to a weight, M. In the ca geeIfis an opening in which a onned by adjusting-screws m m and n, and n` the side of this holder opposite the head c is a slot, y, audintoa square a set-screw, p, the cutter being retained with- I in the recess by a clasp or strap, q, whichis caused to bear rmlyagainst the cutter by gib, fr, and key s.

The blank bolt X is placed in the holder N so that its shank shall project through the slot y and its head rest in the square recess lw. The holder N is then adj usted `so that the shank of the bolt shall be directly on a line with the rod e in the head C. The dierent parts of the machine are now brought to the position shown in Fig. 1, a rotary motion is imparted to the shafts B by any suitable system ot gearing, and the carriage I ismoved toward the head C, by operating the leversJ and pawls f, until the end of each bolt is introduced between the cutters I. As the cutters are carried round with the head they gradually cut a thread in the end of the boltand draw the latter back until its end is brought against the end of the rod e. As this rod is forced back by the bolt the sleeve E and lever F are moved away from the head (l, and the levers Dare thus elevated to the position shown in Fig. 3, the cutters being lifted from contact with the bolt and the carriage being thus atf liberty to be drawn quickly forward by the weight M` As the carriage approaches the limit of its forward motion the plate his brought against the bent end of the rod K, the lever F and y the sleeve K arethus drawn forward, and the levers D are movedto their original position,

preparatory to the introduction of another bolt4 into the holder and a repetition of above-described operation. I

It is desirable that a number of spindles, holders, and carriages should be arranged on one frame, as one attendant can attend to the cutting of threads of several bolts at one time.

I claim as my invention, and "desire to secure by Letters Patent* 1. The weight M or its equivalent, combined with the carriage I, and head C, with its levers and cutters, so that the carriage shall be moved I away from thehead as soon as the cutters are raised from the bolt, substantiallyas described.

2.- The screw-cutting dies P, connected to the levers D and rendered adjustable thereon In testimony whereof I have signed my neme to this speoieation in the presence of two sub- W. W. HUBBARD. Witnesses:

CHARLES E. FOSTER,

JOHN WHITE.

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