Year: 1888

page_text: I, HERBERT JOHN ALLISON, of 52 Chancery Lane, London, in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention, which has
been communicated to me from abroad by Henry Renner Cassel, of the City and
State of New York, United States of America, Gentleman, and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement :-
The object of my invention is to combine in one instrument, the dies for cutting
threads on bolts and other articles of different diameters.
The invention consists in the combination with a forked handle or stock, of two
disks each carried by an arm of said fork, said disk having a series of corresponding
varying sized thread cutting dies on their peripheries.
Description of the drawing forming part of this specification, in which;
Figure 1, is a face view of my improved die and stock. Figure 2 is a face view
of the reverse side thereof, and Figure 3, is a cross section on line c, c, figure 1.
A, in the drawing represents a handle or stock of suitable shape. At one end said
handle is forked, forming two arms a, a. B, B, are two disks each carried by an
arm a, of the stock or handle and by preference placed in a recess b, in said arm as
shown.
The disks B, are held in place by means of screws or other pivots d, which pass
through said disks and into said arms. The disks B, are permitted freedom of rotation
on said pivots.
On the periphery of each disk B, are a series of thread cutting dies of varying
sizes. Near each die e, on the face of the disks B, B, may be placed numbers as, 4, 5,
6, 8, 10, to designate the diameter of the wire or bolt which the dies will receive, and
the numbers as 32, 36, 40, to designate the number of threads to the inch. In using
this improved thread cutter a die e representing the size of the bolt to be cut, is
brought over the space f, between the two arms a, a, by turning a disk B, on its
pivot d. The opposite disk B, is now turned until the corresponding die e, is over the
space, and the two dies e, register. The dies are now in position to cut the threads
on the bolt. The disks B, may be held fast by screws g, passing through the arms a,

page_text: and into the notches h in the disks. With this instrument if a larger or smaller bolt
or wire is to be cut it is only necessary to turn the disks B, until the dies e, of the
desired diameter are over the spaco f, care being taken that the corresponding dies e,
on the disks register. It is often necessary in cutting threads that the corresponding
dies be adjusted closer together at certain stages of the work. This I accomplish by
pivoting the die disks B, B, in the arms a, as described. The arms a, have a spring
tendency and may be drawn together or spread by a screw i, which passes through
both arms. A set screw j, serves to spread said arms and to lock the screw i, in
the arms.
Each handle or stock A, may be furnished with several pairs of interchangeable
disks B, having dies of varying sizes.
With this instrument five more or less different sized bolts can be cut without
removing the dies. This saves considerable time at the same time making a compact
tool, and the dies are always ready at hand. Instead of hanging the die disks
directly in the arms a, they may be pivoted in slides that are hold by said arms.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;
First. The handle A, combined with the disks B, B, having a series of corresponding
e, on their rims, substantially as described.
dies
Second. The forked handle A, having spring arms a, combined with the disks B, B,
having corresponding dies e, substantially as herein shown and described.
Third. The handle A, having spring arms a, and screw i, connecting said arms a,
combined with the pivotod disks B, B, having corresponding dies e, and means for
securing the disks in position substantially as described.