Certain Improvements in Machines for Drawing Metals.
Year: 1893

page_text: Date of Application, 10th June, 1893-Accepted, 29th July, 1893
COMPLETE SPECIFICATION.
Certain Improvements in Machines for Drawing Metals.
I, HUBERT DOLLMAN, of 36, Reservoir Road, Edgbaston, Birmingham,
Warwickshire, Engineer, do by declare the nature of this invention and
in what manner the same is be performed, to be particularly described and
ascertained in and by the following statement :-
This invention consists of the herein-described improvements in machines
(commonly known as draw benches) for drawing metal tubes, rods, mouldings and
the like. The principal object of my invention is to so construct a metal drawing
machine or draw bench that two or more tubes rods mouldings or the like can be
drawn by the same carriage through the dies at the same time thus enabling the
operators to turn over a very much larger quantity of work in a given time than is
possible on an ordinary draw bench where each tube or rod or moulding or the like
is drawn by a separate carriage. Another object of my invention is to improve the
construction of the horn plate against which the die holder or die holders or draw
plate rests or rest.
1 will describe my invention by referring to the accompanying drawings on
which
Fig. 1 is a side elevation and Fig. 2 is a plan of a draw bench constructed
according to my invention for drawing four tubes rods mouldings or the like at the
same time;
Fig. 2 shews the horn plate of the same separately;
Fig. 3 is a side elevation, Fig. 4 is a plan and Fig. 5 is a back elevation of the
carriage of the said machine on an enlarged scale and
Fig. 6 is a side elevation plan and back elevation of one of the draw bolts by
which the ordinary gripping appliances are attached to the carriage.
The same letters of reference indicate the same or corresponding parts in all the
the figures of the drawings.
In carrying out my invention I make the draw bench with two or more draw
chains arranged parallel with each other side by side as is now sometimes done in
other draw benches which have two or more carriages and I make the carriage with
two or more dogs corresponding with the draw chains so that both draw chains will
act upon the carriage and keep it square with the draw chains as it is by them
moved along the bench and I construct the carriage with two or more sets of draw
bolts or teeth or tongs or other well known appliances to connect to corresponding
mandrils, tubes, rods or mouldings or the like which are arranged parallel side by
side and are thus drawn through the dies simultaneously by the same carriage. The
machine shewn on my drawings has two draw chains marked respectively A¹ A²
receiving motion by passing round two of the usual toothed drums D¹ D² mounted
upon a driving spindle E at the front end of the draw bench in the usual way this
driving spindle E receiving rotary motion by spur gearing or other means in the
well known manner. The draw chains A1 A2 pass round the usual cylindrical
drum at the back part of the draw bench. C₁C2 are the two dogs which are
hinged to the carriage at G and connected together by the cross bar H which by
the links I is jointed to the top lever J carried by the bracket K from the top of the
carriage this lever J being connected to the carriage at one end by a coiled spring L
which thus acts upon and maintains both dogs lifted out of the chains when
the carriage is being pushed back. The carriage B has four draw bolts
marked M M² M³ M₁ (or there may be two three or more than four draw bolts)
or other well known appliances to connect to the mandrils or the draw tongs or
gripping appliance in the usual way. These draw bolts are by preference secured
to the carriage B by the cross pins passing through the carriage B and through a
Price Red

page_text: slotted hole m in each of the draw bolts. By slotting the holes m in the draw bolts
I obtain the necessary adjustment of the draw bolts and gripping appliances fixed
thereto so as to connect to the ends of the mandrils or tubes rods mouldings or the
like which may be projecting through the dies at different distances. N is the usual
back part of the draw bench on which the mandril or article being drawn rests
and P1 P2 P3 P4 are the four die holders resting against the horn plate Q through
which the tubes rods mouldings or the like are drawn. The horn plate may
be
made in the well known manner or (and this is what I prefer) as shewn upon my
drawings where the horn plate is represented as a steel casting (see separate view
Fig. 2) made to fit between and bolted to the front portion R and the back
portion N of the draw bench and standing up above the same as shewn to form
the horns n' or part for the die holders to rest against.
My improved draw bench above described works in the well known manner and
therefore the method of working requires no description here. It will be seen that
by the carriage drawing two or more tubes rods mouldings or the like simultaneously
the operators can turn out much more finished work in a given time than is possible
with a draw bench made in the usual way.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what. I
claim is :-
1. In a machine for drawing metals the employment of a carriage adapted for
connecting to two or more tubes rods mouldings or the like and moved forward by
two or more draw chains so as to draw the said two or more tubes rods mouldings
or the like through the dies simultaneously substantially as herein before set
forth.
2. In a drawing machine of the kind denoted under Claim 1 the construction of
the carriage made with the two dogs C1 C2 connected together so as to be engaged
with or disengaged from both draw chains simultaneously as hereinbefore set forth
and shewn.
3. In a drawing machine of the kind denoted under Claim 1 making the draw
bolts with slotted holes m and securing them to the carriage by a cross pin passing
through such slotted holes so as to allow of the adjustment of the draw bolts when
connecting to the article being drawn substantially as herein before set forth.
4. In a machine for drawing metals the construction of the horn plate Q made
and fixed in between the front and back portions of the bench substantially as
hereinbefore set forth and shewn.
5. The improved machine for drawing metals hereinbefore described and
illustrated by the accompanying drawings.
Dated this 8th day of June 1893.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.