Improvements in Turning Lathes.
Year: 1889

page_text: Date of Application, 7th Nov., 1889
Complete Specification Left. 7th Aug.. 1890-Accepted. 20th Sept.1890
PROVISIONAL SPECIFICATION.
Improvements in Turning Lathes.
DAVID BARNETT Oakland Villa Somerset Road Handsworth Birmingham Screw
Manufacturer, do hereby declare the nature of this invention be as follows:-
This invention applies to Improvements in Turning Lathes for turning and shaping
screw blanks and other pieces out of brass, iron or other metal rods.
1st. The invention consists of a steel bush either in one piece or split and supported
in any convenient manner, with a round, square or hexagon hole through it, and
through which said hole, round square or hex. rods pass from the head stock of
the lathe.
'
2nd. Two straddlers worked on centres or pins, into the head of which straddlers,
steel shaped cutters are placed for turning or shaping the said round square or
hexagon rods into any desired form.
3rd. A "rocker" which turns in a pin by raising or depressing a handle affixed
to said rocker; this rocker in raising the handle is brought against a " straddler
mentioned in No. 2 clause, and this action on the "straddler " carries the cutters
placed in it against the rod that passes through the "bush," and thus shapes or turns
the round, square or hexagon rod, while it is revolving.
The novelty of this invention therefore is in the combination of the "bush,"
"straddler" and "rocker."
1000
COMPLETE SPECIFICATION.
Improvements in Turning Lathes.
I, DAVID BARNETT of Oakland Villa, Somerset Road Handsworth, in the County
of Stafford Screw Manufacturer, 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 :-
My invention applies to parts of a "turning" lathe, for turning and shaping screws
nuts, and other articles out of brass, iron, or other metal; the object being to obtain
a lathe that may be very readily and easily manipulated so that a large number of
similar articles may be rapidly produced.
In carrying my invention into effect, I employ two rocking tool holders or
straddlers, working upon centres or pins, and supported by a fixed rest or bracket
attached to the bed of the lathe. The heads of the straddlers are provided with a slot
suitable for the reception of the cutting or turning tools. These straddlers are turned
about their centres as desired, by means of a lever or rocker; the rocker being
provided with a manipulating handle, so that by raising or depressing the handle, the
rocker is brought into contact with one or other of the tool holders or straddlers, and
the cutting tools are thus brought to bear against the rod or bar of metal to be
operated upon.
In order to keep the rod or bar of metal rigid and free from springing during the
operation of turning and working the metal to the desired shape or form, I employ
a bush of steel, iron, or other suitable material either in one or more pieces, and
supported in any convenient manner so as to act as a steady or guide for the
bar or rod.
In order that my invention and the method of carrying the same into effect may

page_text: be more readily understood, I append hereunto two sheets of explanatory drawings
to be hereinafter referred to.
Figure 1 and Figure 2 (sheet 1) are part front elevation and plan respectively,
showing my improved lathe, the reference letters being the same for each view, and
in which A is the lathe bed, B the fixed head stock, and C the driving clutch carried
on the end of the hollow driving shaft D. The rod or bar O from which the articles.
are to be produced, is passed through the hollow shaft D, and the guiding bush or
die T (Fig. 4 sheet 2) carried in the bracket R. The rod has a rotary or revolving
motion imparted to it by means of the clutch C. The ordinary capstan, or turret,
for carrying the drilling, screwing, and other tools, is shown at F. This head stock,
driving shaft, driving clutch, and the capstan, are not shown in plan (Figure 2) and
they do not form any part of my present invention. The rocking tool holders, or
straddlers G G (Figures 1 and 2, sheet 1, and Figure 3, sheet 2) pivoted upon the
centre points of the screws g¹ g³ g³g, are operated by the lever or rocker H; the
heads of the straddlers are provided with slots for the reception of the cutting or
turning tools such as J J', such tools being, tightly secured in the straddler heads by
set screws jjjj³·
The rocker or lever H is pivoted upon a pin K (Figures 1, 2 and 3) carried by
the lugs or brackets kk cast upon or attached to the fixed rest or supporting
bracket Q; and is provided at its outer end with a wood or other handle L. Thus
when the handle L is depressed, the tool holder or straddler G' is pressed forward
by the set screws at the head of the arm M of the lever H (Figure 3) until the tool J₁
is brought into working contact with the bar or rod of metal Ŏ. When the handle L
is raised, the arm M of the lever H is carried away from the straddler G¹, but the
spring P (shown by dotted lines in Figure 3.) compels the straddler to follow the
backward movement of the arm, and the tool J is thus removed from contact with
the bar or rod of metal O. On continuing the upward movement of the handle L, the
straddler G is pressed forward by arm N of the lever or rocker H, and the tool J is
thus brought into action. In Figure 3, the handle L is shown in its "mid" position,
and, consequently, neither of the tools J J¹ are in contact with the bar O.
The distance through which the straddlers G G₁ can travel, is fixed in the one
direction by the sides or ends qq of the fixed rest or bracket Q (Figure 3) and in
the other direction by the stop on the die bracket R (Figure 4). The guiding or
steadying bush or die T (Figure 4) is set in a die block S in the bracket R (Figs. 1, 2,
4 and 5) this die block being adjusted and set in position by means of set screws as
shown in Figure 4. Figure 6 is an elevation, and Figure 7 a section of the bush or
die together with the die block. The die T is kept in position by means of the pin U
passing through the block S and entering a groove formed in the die or guiding
bush T. I employ dies having round, square, hexagonal, or other shaped apertures
or holes formed in them to suit the round, square, hexagonal, or other shaped bar or
rod of metal that I may employ, from which to form the desired articles. These dies
(which may be solid or split), are all made of a uniform external diameter, length,
and shape, so that they may all be fitted into one and the same die block.
The tool guide E shown in Figures 4 and 5 is for the purpose of steadying the
drilling, tapping, or other tools carried by the turret, or capstan F (Figure 1), when
such tools are brought into operation upon the bar or rod of metal O; they being
caused to pass through the guiding hole e. When working with the straddlers or
rocking tool holders, I turn the guide E up into the position shown in Figure 4 as it
is not then required; but when in use, the guide E is brought round upon its centres
to the position shown in Figure 5.
I may employ any suitable kind or form of spring or springs for the purpose of
keeping the straddlers in contact with the arın of the rocker or lever, and do not
limit myself to the form shown in Figure 3; sometimes also I dispense with springs
altogether by making one pivot or fulcrum serve for the two straddlers, though I
prefer to adopt the arrangement previously described and as illustrated in the accom-
panying drawings.

page_text: 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 construction and arrangement of "tool holders" for "lathes," having a
rocking motion for allowing the tool or tools to be readily and easily manipulated by
means of a hand lever cansing such tool holders to rock or move upon a fixed pivot
or pivots attached to a portion of the slide or saddle frame of the lathe, as and for
the purposes hereinbefore described and as set forth.
2. In a lathe employed for producing articles such as screws, pins, nuts, or other
articles in large numbers; the combination of a pivoted tool holder such as G G¹
with a rocking lever such as H, as and for the purposes herein before described, and
substantially as illustrated in the accompanying drawings.
3. In a lathe employed for producing large quantities of small articles, the
combination and arrangement of a die and block or support such as S, U; carried
in a rest such as R; together with the rocking tool holder such as G G₁ and lever
such as H, for the purposes hereinbefore described, and substantially as illustrated in
the accompanying drawings.
Dated this 6th day of August 1890.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for Applicant.