Improvements in Bushings or Guides for Die-stocks.
Year: 1898

page_text: Date of Application, 5th July, 1898-Accepted, 10th Sept., 1898
COMPLETE SPECIFICATION.
Improvements in Bushings or Guides for Die-stocks.
A communication by GEORGE PERCY BARD, of 223, Broadway, Norwich, in the
County of New London, and State of Connecticut, United States of America,
Medical Student.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.ME., of the Agency for Foreign Patent
Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both in the
County of Lancaster, 118, New Street, Birmingham, in the County of Warwick, and
322, High Holborn, in the County of Middlesex, Civil Engineer, do hereby declare
the nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention is in bushings or guides for use with pipe-threading die-stocks,
and the object of said invention is to provide a simple and inexpensive form of
guide complete in itself which can be utilized with die-stocks as now commonly made
and which may be readily attached to such die-stocks and adjusted to support pipes
of various diameters.
Heretofore it has been a common practice to use, with this class of die-stocks,
bushings of simple ring form for centering the piece of pipe to be threaded, it
being necessary to provide a separate ring for each size of pipe which it is desired
to thread. This present invention does away with such rings and provides a single
independently organized holder that may be quickly attached to the die-stock
and adjusted to center the pipe with the threading dies so as to support it during
the threading operation.
In the annexed drawings Figure 1 is a plan view of a die-stock having this newly
invented bushing mounted thereon.
Figure 2 is an elevation of the same parts. Figure 3 is a plan view of said device
partly broken away to expose the interior mechanism and Figure 4 is a cross-
sectional view taken on line x-x of Figure 3. Figure 5 shows plan and edge
views of one of the jaws of said bushing. Figure 6 illustrates a slightly modified
means for attaching the said bushing to the die-stock.
In these drawings A indicates the die-stock and B the adjustable bushing as a
whole.
The die-stock is formed with an integral collar 10 that projects from the side of
the stock opposite the threading dies, and 11 denotes a hub projecting from the said
bushing and of a size suitable to either slip inside the stock-collar 10, as seen in
Figure 2, or to slip over said collar, as seen in Figure 6, that is to say, one of the
parts (stock or bushing) is provided with a collar and the other part is formed with a
hub adapted to enter and be supported by said collar. Said collar and hub may be
clamped together by a set screw 11ª. Supported by the hub 11 is a disc 12 having a
circumferential flange 13.
14 denotes a disc formed with a flange 16 that is of a size adapted to easily fit over
the flange 13, and mounted in the flange 16, (or preferably in an enlargement 16"
thereof), is a thumb-screw 17 by means of which the discs 13-16 may be clamped
together after the bushing has been adjusted, as will be explained.

page_text: Within the cupped disc 12 are three jaws 18-18 18, of substantially triangu lar
form, each of which jaws is provided with a stud 19 that enters a hole in the disc 12,
thus locating the said jaws at a given distance apart and each of said jaws is also
provided with a stud 20 upon its outer face, and at its free end, which studs lie in
cam slots 21 in the disc 16; the said slots being of such pitch that, when the disc 16
is partially rotated on the disc 12, the studs 20 are forced outward, or inward, as the
case may be, and the jaws 18 are correspondingly moved to vary the opening
between them, in order that large or small pipe may be inserted between, and held
by, said jaws.
In order to hold the outer disc 16 in position on the cupped disc 12, slots 22 are
formed in the last named disc and in said slots are located screws 23 that are screwed
into bosses 16b formed on the inner side of the disc 16; the slots 22 being of
sufficient length to allow the cam disc 16 to be moved at least one sixth of a
revolution, relatively to the fixed disc 12. The central opening 24 should be of
a diameter sufficient to receive the largest pipe which it is desired to thread; then
by properly adjusting the jaws 18 (by partially rotating the cam disc 16 as explained)
any pipe of smaller diameter may be supported and, inasmuch as the jaws 18 move
simultaneously toward the centre of the described bushing or holder, a pipe supported
thereby is always centered with the threading dies.
The described bushing may be cheaply produced, is complete in itself, may be used
with ordinary die-stocks, is readily operated by any person of average intelligence,
and effectually performs the work of the several removable and separate ring-bushings
now so commonly used.
Having now particularly described and ascertained the nature of this said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is
As a new article of manufacture, a separate and independent bushing for a die-stock
which bushing is provided with a collar that is adapted to fit a corresponding collar
upon a die-stock, whereby the same bushing is adapted to be used upon different
die-stocks, combined with the adjustable jaws pivoted in the bushing, substantially as
shown and described.
ALL
1
1000