Improvements in Die Stocks and Screw Cutting Dies.
Year: 1899

page_text: Date of Application, 10th Nov., 1899-Accepted, 17th Mar., 1900
COMPLETE SPECIFICATION.
Improvements in Die Stocks and Screw Cutting Dies.
I, WILLIAM ROBERTSON ANDERSON, of 72, Brenton Street, Cleveland, Ohio,
U.S.A., Mechanical 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 relates to improvements in die stocks and screw cutting dies.
In the accompanying drawings, Fig. 1 is a plan view of the invention with all
the parts in their working relation and the adjusting lever closed.
Fig. 2 is a similar view with parts of the cam plate broken away and the
adjusting lever at the outer limit of its operative movement.
Fig. 3 is a front elevation. Fig. 4 is a cross sectional elevation on line 4, 4,
Fig. 1 and
Fig. is a perspective elevation of one of the dies, both being alike, but
rights and lefts.
Referring to the said drawings, A represents the body of the stock, which can
be constructed at its ends to make either hand or power connections, and in
this instance has internally threaded extremities for the insertion of handles, B.
Centrally of the said body A of the stock is a rectangular recess or depression, 2,
having the depth and width shewn by side walls or flanges, 3, Fig. 4, and the
length substantially as disclosed in Fig. 3. Usually and preferably the said
recess is of greater length than width because it gives a better proportion to the
tool, but these sizes may be changed to suit different requirements without depart-
ing from the spirit of the invention. The bottom 4 of said recess is flat and
smooth, and has a central opening, 5, of sufficient size to accommodate the largest
size of rod or pipe the tool may be made to receive for threading. It will, of
course, he understood that each size of tool is adapted to cut a number of sizes
of screws ranging between the largest and the smallest of its capacity, and also
that a number of sizes of tools is provided ranging up to the cutting of pipes
of very large dimensions.
The two dies C and C are constructed to occupy and work in the recess 2 of the
stock or body, A, and they rest Bat upon its bottom and fit closely to its sides, 3,
yet are loose enough to slide freely in operation; or the dies may rest and
travel on the sides by shouldering them at about half of their depth or thickness.
This will allow the bottom of die space in stock to be left entirely open. Each
die has the usual segmental cutting threads 6 on its inner edge and straight
channels or grooves
oblique to their traverse axis, the bottoms of which are
shown here as substantially Hush with the edges of the side flanges 3 of the stock.
The respective channels or grooves 7 run also at an inclination or obliquely to
each other, and are engaged by the corresponding ribs or projections 8 on the
bottom of the transversely slidable actuating and confining member of plate D.
This plate is preferably flat at bottom and top and has its ends 9 beveled more
or less to run in the undercut bearings 10 in the stock A, the fit being again a
close one to avoid false play, but free enough to leave room for lateral adjust-

page_text: ment. These end bearings need to be such as to make firm the engagements o
the plate D therewith and prevent any appreciable lifting or rising of the plate 1
in action, because the strain on said plate is mostly upwards. Said plate is
therefore, also of such strength throughout as to withstand all strain at all points
and is of somewhat greater width than the body, A, as shown. The inner ends
of the ribs 8 are tapered on their outside to adapt them to work with the
straight transverse sides of the stock, as seen in dotted lines, Fig. 1, and between
said ribs and centrally of the plate is an oblong opening 12, corresponding to the
opening 5 in the bottom or reverse side of the stock.
When the plate D is in working position it is designed to rest flat upon the
dies C and C, and as it does this it also stands perceptibly above the level of the
top of body, A, say somewhat as seen in Fig. 3, so that the operating lever E
when fastened down, will serve also in part as means to keep or clamp the said
plate down in proper working position.
The lever E is plainly seen in outline in Figs. 1 and 2, and has three separate
slots a, b, and c, engaged by three several screws or pins, d, f, g, to confine and
adjust said lever. Thus, the screw d engaged in the body A is a fixed point of
engagement for the lever; f, is its confining and fulerum screw on plate D, and
is an adjusting thumb screw on the body A, by which the lever is firmly fastened in
any desired adjustment. I may use a scale on the plate D or on lever E to indicate
degrees of adjustment, and the relative positions of the dies C and C which are
determined by the said lever. Thus, in Fig. 1, we have their nearest possible
relation, where the lever has been removed inward to the innermost limit of slot c,
and in Fig. 2 we have the other extreme when it has reached the outermost limit
of said slot. The screw g has two diameters, as seen in full and dotted lines in
Figs. 2 and 3, so that the larger diameter will not pass through the narrowed
outer end of slot c, but the smaller portion below will.
Ordinarily the lever E is intended to be confined, and is only removed to change
the dies or for some such purpose. By disengaging the slot e from the screw g,
the block 1) and the lever are easily removed and replaced together.
The side walls 3 serve as guide walls or ways for the dies, the same as longi-
tudinal ribs in the bottom of the body or stock would if they engaged channels
in the underside of the dies.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The body of the cutter having a central depression and parallel longitudinal
guide ways for the dies and transverse bearings for the confining plate at the
ends of said guide ways, in combination with dies in said depression between said
guide ways, a transversal slidable member engaging said dies and said transverso
bearings, and means to adjust and lock said slidable member, substantially as
herein before described and shewn in the accompanying drawings.
2. The body of the cutter constructed with parallel guide ways along its sides
for the dies, and a set of dies confined by said guide ways and having oppositely
inclined transverse channels in their top, in combination with an adjusting
member supported in said body and having ribs engaged in suid channels, and
means to adjustably lock said member in working position, substantially as herein-
before described, and shewn in the accompanying drawings.
3. The body part having longitudinal guide ways for the dies and transverse
confining bearings for the die adjusting member, in combination with a set of dies
aud the said adjusting member, and an adjusting lever engaging said member,
substantially as hereinbefore described, and shewn in the accompanying drawings.
4. The body of the tool, guides for the dies running one direction and bearings
for the die confining plate running at right angles thereto, in combination with
the dies having transverse inclined channels on top, the confining plate having ribs

page_text: on its bottom engaged in said channels and an adjusting lever lying across the
top of said plate and connected therewith between its ends and with the said body
at its end, substantially as hereinbefore described and shown in the accompanying
drawings.
5. The body of the cutter and dies and plate, and an adjusting lever for said
plate overlapping the same at both ends, and screws to temporarily secure the
lever to the body and plate, substantially as hereinbefore described and shewn in
the accompanying drawings.
6. The body of the tool and the two die sections therein, in combination with a
transversely guided slidable member engaging said dies, and a lever to adjust
and lock said member having two points of engagement with the said body and
one intermediate thereof with the said slidable member, substantially as herein-
before described and shewn in the accompanying drawings.
7. The body of the tool having transverse guide ways on one plane and longi-
tudinal guide ways on a lower plane, at right angles thereto, in combination with
a set of dies seated between the lower guide ways and having divergent chanaels
across their top, a plate resting in the said transverse guide ways and having
ribs on their under sides working in the top channels of the said dies, and an
adjusting lever across the said plate and engaged detachably therewith and with
the said body at both ends, substantially as hereinbefore described and shewn
in the accompanying drawings.
Dated this on day of November load.
JOHNSONS,
Petitioner's Agents, 116, St. Vincent Street, Glasgow.