Improvements in Machinery or Apparatus used in connection with the Manufacture of Seamless Steel Tubes.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Machinery or Apparatus used in connection with
the Manufacture of Seamless Steel Tubes..
I, ALFRED SMALLWOOD, of River Street, in the City of Birmingham, Manu-
facturer, do hereby declare the nature of this invention to be as. follows:-
-
This invention relates to means for increasing or decreasing or otherwise
adjusting the length of the mandril bar employed in connection with draw-
benches for the production. of seamless metallic tubes, without the employment
of what are known as "making-up pieces."
Thus in drawing down different sized billets on the same draw-bench, different
lengths of mandril bars are usually employed, and in order to make
the mandril bar longer or shorter it is customary to use making up
pieces, in the form of tubular lengths, outside screwed at one end
and inside screwed at the other end to admit of the same being
interchangeably connected or disconnected to or from one another or to or from
the mandril bar. This method of increasing or decreasing the normal length of
the bar is very primitive, expensive and troublesome, besides the waste of time
involved in the fitting together of the supplementary pieces.
The object of my invention is to provide a means for adjusting the distance
between the nose of the mandril and a back stop collar on the end of 'a draw-bar
or slide.
Thus in carrying out my invention, I take an ordinary draw bench, with the
middle part fitted with the usual upright bracket secured to the top of the bed and
having formed within it, a mouthed die wherethrough the billet is drawn by a
pair of tongs taking hold of the tag, the nose of the mandril bar extending axially
into the eye at the middle of the die. The drawing operation may be performed
by an endless chain with gear as is usually done.
The back end of the draw-bench has an upright bracket standing up from the
end of the bed and with a bearing hole in its middle in line with the axis of the
hole in the die, and wherethrough the hollow draw bar or tubular slide, which has
a back collar or stop at its rear end, and a nut or forward stop at its other and
outside-screwed end, passes.
.
The fore end of the hollow slide, is internally screwed and takes one end of a
screwed adjustment bar or rod, whose other and forward ends takes into, or is
made fast to, a socket or dog, whose fore part is also inside screwed and receives
the back end of the mandril. Taking upon the adjustment bar is a lock nut,
which when screwed home, against the nut at the end of the slide, locks the
adjustable bar in any determined position.
The amount of traverse which the slide can make is about equal to the clearance
or distance between the nose of the mandril and the front of the die, or in other.
words, about equal to the length of the die, so as to admit of the said billet being
introduced onto the mandril.
Threaded upon the slide and coming up to the front stop is a loop or ring

page_text: bracket, having attached to it, a band, rope or chain, which is pulled by the
workman for taking the tagged end of the billet through the die.
Assuming that a new mandrilbar has been connected to the back slide, then
after the lock nut has been slackened, the workman pulls both the mandril bar
and slide forwards until the back stop comes up to the bracket, and if the nose of
the mandril does not come into its proper position within the die, then he rotates
the adjusting bar which propels or repels the mandril bar until the desired position
is acquired. The lock nut is then screwed up tight, when the mandril bar and
slide are rigidly clamped together and move as one.
To enable the operative to introduce the billet onto the mandril, the mandril
bar is pushed backwards until its fore stop comes against the upright bracket at
the back end of the bench. The billet is then introduced over the nose of the
mandril and the mandril bar is then pulled forward by means of the chain or rope
provided for that purpose until the tagged end lies in its proper position with n
the eye of the die.
Instead of lengthening or shortening the mandril bar by screwing the adjust-
ment bar into or out of the slide, the forward end of the said slide may carry a
swivelling nut or screw box into which a screwed part or extension of the adjust-
ment bar takes and is propelled or repelled by the rotation of the nut in one
direction or the other.
Or the adjustment bar may have rack or ratchet teeth cut within it, with which
a pawl or other suitable catch, carried by the slide, or an extension of or attach-
ment to, the same, engages and holds it in its adjusted positions, the said
adjustment being effected by a simple sliding movement or by a pinion or other
gear.
1007
ALFRED SMALLWOOD.
By Henry Skerrett,
Agent for Applicant.
Improvements in Machinery or Apparatus used in connection with
the Manufacture of Seamless Steel Tubes.
I, ALFRED SMALLWOOD. of River Street, in the City of Birmingham, Manu-
facturer, 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 means for increasing or decreasing or otherwise
adjusting the length of the mandril bars employed in connection with draw-
benches for the production of seamless metallic tubes, without the employment of
what are known as making-up pieces.
Thus in drawing down different sized billets on the same draw-bench, different
lengths of mandril bars are usually employed, and in order to make the mandril bur
longer or shorter, it is customary to use what are known as making up pieces, in the
form of tubular lengths of metal, outside screwed at one end and inside screwed at
the other end to admit of the same being interchangeably connected or discon-
nected to or from one another or to or from the mandril bar. This method of
increasing or decreasing the normal length of the bar is very primitive, expensive
and troublesome, besides which, a considerable waste of time is involved in the
fitting together of the supplementary pieces.
The object of my invention is to provide a means for adjusting the distance

page_text: between the nose of the mandril and a back step collar on the end of a draw-bar
or slide without the employment of supplementary detachable pieces as heretofore,
which adjustment is effected by apparatus illustrated in the accompanying
drawings, in which
Figure 1 represents a draw-bench fitted or provided with my improved mandril
adjusting means.
Figure 2 is an elevation, upon an enlarged scale, of the said appliance
separately, and
Figure 3 is a longitudinal vertical section of the same.
Figure 4 represents the slide and its adjustable end stops, separated.
Figure 5 represents in side elevations and edge view the cottar pin or key by
which the slide is prevented from rotating during the adjustment of the distance
between the end stops.
Figure 6 represents an edge view and an elevation of the pull or bracket ring
readed upon the said slide, inward's of the front stop.
The same letters of reference indicate corresponding parts in the several figures
of the drawings.
Thus, in carrying out my invention, I take an ordinary draw bench a with the
middle part fitted with the usual upright bracket al, secured to the top of the
bed a², and having formed within it, a mouth die b, wherethrough the billet or
partly-drawn tube c, is drawn by a pair of tongs taking hold of the tag, the nose d
of the mandril bar d, extending axially into the eye or hole 1, at the middle of
the die. The drawing operation may be performed by an endless chain with gear
as is usually done.
The back end a³, of the draw-bench has an upright bracket a², standing up
from the end of the bed and with a bearing hole a³, in its middle in line with the
axis of the hole in the die, and wherethrough a hollow draw bar or tubular slide e,
having a back collar or stop nut el, screwed upon its outside wormed rear end e²,
and a nut or forward stop e³, at its other and outside-screwed end e, passes.
The fore ende, of the axial hole e6, through the said hollow slide is internally
screwed to take a screwed adjustment bar or rod f, running longitudinally through
the whole length of the said slide, and with the forward end f¹, taking into or
being made fast to, a socket or dog g, whose fore part g', is also inside screwed
at g², and receives the back screwed end d², of the mandril d. Taking upon the
adjustment bar is a lock nut h, which when screwed home, against the adjusting
stop nut 3, at the end of the slide, locks the adjustable bar in any determined
position relative to the said slide.
The amount of longitudinal traverse which the slide can make through the eye
or hole as, in the back bracket is about equal to the clearance or distance between
the nose of the mandril and the front of the die, so as to admit of the said billet
being introduced onto the mandril.
Threaded upon the slide and coming up to the front stop is a loop or ring bra ket i,
having attached to it, a band, rope or chain ¹, which is pulled by the workman
for taking the tagged end c', of the billet or tube c, through the die.
Assuming that a new mandril bar has been connected to the back slide, then
after the lock nut h, has been slackened, the workman pulls both the mandril bar
and slide forwards until the back stop e¹, comes up to the back bracket at, and if
the nose of the mandril does not come into its proper position within the die, then
he rotates the adjusting bar f, which propels or repels the mandril bar connected
with it until the desired position is acquired. The lock nut is then screwed up
tight, when the mandril bar and slide are rigidly clamped together and move as
In order to prevent the slide bar rotating during the operation of adjusting
the bar f, a key or cottar j, is engaged with coincident key-ways j¹, 2, cut within
the slide and back bracket respectively.
one.
To enable the operative to introduce the billet onto the mandril, the slide bar
is pushed backwards until its fore stop comes against the upright bracket at the

page_text: back end of the bench. The billet is then introduced over the nose of the mandril
and the mandril bar is then pulled forward by means of the chain or rope ¹,
provided for that purpose until the tagged end lies in its proper position within
the eye of the die.
Instead of lengthening or shortening the mandril bar by screwing the adjust-
ment, bar into or out of the slide, the forward end of the said slide may carry a
swivelling nut or screw box into which a screwed part or extension of the adjust-
ment bar takes, and is propelled or repelled by the rotation of the nut in one
direction or the other.
Or the adjustment bar may have rack or ratchet teeth cut within it, with which
a pawl or other suitable catch, carried by the slide, or an extension of, or attach-
ment to, the same, engages and holds it in its adjusted positions, the said
adjustment being effected by a simple sliding movement or by a pinion or other
gear.
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:-
First. A draw bench fitting for adjusting the distance between the nose end of
a mandril and a back stop collar on a draw-bar or slide; consisting of a screwed
adjusting bar, having at one end, a socket, dog or equivalent for connecting the
same to a mandril, whilst the other end is adjustably connected to the slide, sub-
stantially as described and set forth.
Secondly. A draw-bench fitting for adjusting the distance between the nose
end of a mandril and a back stop collar on a draw-bar or slide, consisting of a
screwed adjusting bar, having at one end a socket, dog or equivalent connection
for the mandril, whilst another part is adjustably connected to and passes through
the hollow interior of the slide, and is secured in its adjusted position by a lock
nut, substantially as described and set forth.
Thirdly. The improvements in machinery, appliances or fitting of draw-benches
for use in connection with the manufacture of seamless metallic tubes by a
drawing process, substantially as described and set forth.
TOIN IZIN
Lieranor
ATLETONOP LAYE
ALFRED SMALLWOOD.
By Henry Skerrett,
24 Temple Row, Birmingham, Agent for Applicant.