Improvements relating to Tube Drawing Machinery.
Year: 1899

page_text: Date of Application, 1st Mar., 1899—Accepted, 8th Apr.,
1899
COMPLETE SPECIFICATION.
Improvements relating to Tube Drawing Machinery.
I, ALFRED MILWARD REYNOLDS, of The Patent Butted Tube Company Limited,
of Newton Row, in the City of Birmingham, Manufacturers, 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 consists of improvements in machinery and appliances employed
for tube drawing, and particularly relates to the construction and arrangement
of machines and appliances for the manufacture of butted or reinforced tubes
(or tubes with a varying thickness of metal), for cycle construction and other
purposes, by the process and with the tools described in the Specification
No. 24931 of 1897, on which Letters Patent have been granted.
In the two accompanying sheets of explanatory drawings to be hereinafter
referred to:
-
Figure 1 on Sheet 1 is a plan and Figure 2 a side elevation of a tube draw-
ing machine constructed in accordance with my invention.
Figure 3 on Sheet 2 is a sectional end elevation of the machine on the line ab
(Figure 2). Figure 4 is a sectional end elevation on the line c d (Figure 1),
and Figure 5 an end elevation of one of the extension tables.
The same reference letters in the different views indicate the same parts:-
My improved machine comprises a horizontal frame or bed A carrying a racked
slide or saddle B arranged in gear with a pinion C. The said pinion is secured
upon a shaft D upon which is also secured the large spur wheel E gearing with
the clutch controlled pinions F, FI mounted loosely upon the shafts G G¹ respec-
tively. One of the shafts G G¹ of the machine is connected in any ordinary
manner with the line or counter-shaft from which the necessary driving power
is transmitted to the machine, and as the two shafts are connected by gear
wheels H H they are caused to revolve in opposite directions as indicated by
the arrows 1 and 2. As each of the pinions F F¹ are mounted loosely upon
the shafts G G¹ respectively, no motion is transmitted to the slide operating
pinion C until one or the other of the sliding clutches J J¹, feather keyed to
the shafts G G respectively, is thrown into gear with the pinion For F¹.
The operation of the clutches J J¹ is effected by means of a double forked
lever as K fixed on the vertical pivot shaft K. The forks of the lever K
respectively embrace and are connected with the clutches J J₁. The necessary
oscillation of the lever K to produce the required movements of the clutches is
obtained by the movement of either of the hand levers L or L' which are jointed
to the rods M M and thus connected with the arm or extension k from the
lever K as illustrated. When the clutch J is in gear the slide or saddle B
will be moved in the direction of the arrow 3 (Figures 1 and 2) but when the
clutch J is in gear the slide or saddle B will be moved in the reverse direction.
The slide or saddle is automatically brought to rest at the end of each stroke
by means of a draw-bar N, working in bearing lugs or brackets on the machine
frame, which is connected with the upper ends of the hand levers L and L', and

page_text: carries collars as n n¹ adjustably fixed near its respective ends, with which collars
the arm or projection b from the slide or saddle B alternately comes in contact.
To take up the momentum of the slide and gearing at the end of each stroke
and to assist its restarting we provide a pair of buffer springs as 61 62 and 63 64,
at each end of the machine frame as illustrated.
At each end of the slide or saddle B we attach a chuck or mandrel holder as B¹
and B having preferably two holes or apertures for the reception of the ends
of the mandrels on which the tubes are drawn. The ordinary tube dies are
fitted in recesses in the ends as a and a² of the machine frame, being secured
therein in any convenient manner, and on the outer face of each of such ends a¹
and a² I attach an extension bed or table as 0 and 0¹ on which I mount the
adjustable brackets as P and P¹ respectively, each bracket having slots as p for
the end of each tube or mandrel to pass through.
In employing my improved machine arranged for carrying a pair of mandrels
at each end of its saddle or slide in the manufacture of double butted tubes or
tubes with thickened ends by the processes and with tools or appliances described
in the former specification herein before referred to, I preferably attach one
necked mandrel and one plain mandrel side by side at each end of the machine,
the necked mandrel serving for the thinning of the tube metal to the desired
extent between the butted ends and the plain mandrel for the sizing or finish-
ing draw. Thus the operations are performed simultaneously at each end of
the machine.
When the slide or saddle B is travelling in the direction indicated by the
arrow 3 (Figures 1 & 2) the tubes on the mandrels in engagement with the
chuck or holder B₁ are forced through the dics in the end of the machine and
are thus respectively drawn and reduced upon the necked mandrel and finish
drawn on the plain mandrel, the tube upon the latter mandrel having been pre-
viously drawn on the necked mandrel. Simultaneously with the said combined
operations at one end of the machine, the tubes at the opposite end of the
machine are withdrawn from their mandrels in a manner similar to that described
in the prior specification hereinbefore referred to and as illustrated on Sheet 2
of the drawings accompanying such specification, the drawn tube on the necked
mandrel being held back, by the abutment of the retaining piece p¹, (which fits
over the grooved gripping sleeve or nut E shown on the drawings accompany-
ing the prior specification), with the outer face of the bracket P, whilst the
mandrel moves with the slide or saddle and is thus withdrawn. The removal
of the tube from the plain mandrel on which it is finished drawn or sized, may
be effected by means of an ordinary extractor box, or its equivalent, on the same
return stroke.
In the manufacture of single butted tubes, or tubes with but one end thick-
ened or of tapering thickness, with my improved machine, I preferable effect
the withdrawal of the tubes from both the mandrels by means of an ordinary
extractor box or its equivalent.
In a similar manner on the reverse movement of the slide or saddle the tubes
and mandrels then fitted in engagement with the chuck or holder B are forced
through the dies whilst the tubes at the other end of the machine are withdrawn
from their mandrels.
The brackets and P¹ are made readily adjustable in position upon the
extension beds or tables 0 0¹ to suit the particular lengths of tubes to be
operated upon.
After forcing the tubes and their mandrels together through the dies, I pass
the tube on the necked or first drawing mandrel through an ordinary reeling
machine in order to release the tube before submitting it to the withdrawing
operation hereinbefore described.
I sometimes arrange a single ended machine in a similar manner to the
double ended machine herein before 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. In machines for the production of solid drawn steel or other tubes having
a uniform or varying thickness of metal or with butted or reinforced ends, the
combination with a reciprocating slide or saddle having a mandrel chuck or
holder at one or both ends, of an extension bed or table at one or both ends of
the main frame of the machine each bed or table having an adjustable bracket
mounted thereon, substantially as and for the purpose described.
2. In machines for the production of solid drawn steel or other tubes having
butted or reinforced ends or a varying distribution of metal throughout their
length, the arrangement and combination of parts whereby the operation of
drawing a tube to produce the required variation in the distribution of the metal,
and the finish drawing of a tube previously subjected to the aforesaid operation,
can be accomplished simultaneously, substantially as described.
3. In tube drawing machines, the combination comprising a slotted bracket
as P or Pl, and a retaining piece as p¹ which fits over the grooved sleeve or nut
secured with the tube and is caused to abut against the said bracket, substantially
as and for the purpose described and as illustrated.
4. In tube drawing machines the arrangement and combination of a racked
slide or saddle, with driving gear, clutches, clutch operating mechanism, and
automatic stopping device, substantially as described and illustrated.
5. In tube drawing machines, the arrangement of buffer springs to work in
combination with a reciprocating slide or saddle and other parts, substantially
as and for the purposes described and as illustrated.
6. The general arrangement and combination of parts forming the improved
tube drawing machine, substantially as described and as illustrated.
Dotal : 991 ...
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester,
Agents for the Applicant.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester,
Agents for the Applicant.