Studs or pivots secured upon same and fitted within the girders or side frames
Year: 1886

page_text: p. p. Studs or pivots secured upon same and fitted within the girders or side
frames L. L.
Q. The die.
R. R¹ Pulleys for driving shaft.
In construction my machine consists essentially of a screw shaft A arranged to 5
work within a worm wheel C. revolving on suitable bearings B. B¹. This worm
wheel C is provided within the boss, with a nut or thread D, corresponding with
the thread of the screw shaft A and engages with the worm E upon the shaft e,
motion being imparted thereto by means of the spur wheel F and pinion G.
The screwed shaft A receives a backward or forward movement according to the 1
direction which the wheel C is made to revolve and has secured upon each end a
suitable crosshead H. H¹ provided with guide rollers I. I. arranged to run upon
a flange or rod K, attached to the side frames L. L
Within these crossheads H. H¹ are a pair of steel jaws M. M. for the purpose of
gripping the rod or tube N to be operated upon.
At the opposite end of the frame is the die seat O. This die seat consists of a
vertically pivotted plate O. arranged within an outer frame P, the latter being
pivotted horizontally within suitable bearings on the side supporting frames L. L.
Within this plate O is the die Q through which the rod N is drawn.
By this arrangement the die is free to move slightly in a vertical or horizontal
direction so as to admit of its adjusting itself to the line of draught at all times.
When the bar to be drawn is inserted in the die and caught between the
jaws M. M it is evident that as soon as the slightest pull is exerted by moving the
screw shaft A, the centre of the die Q will place itself accurately in a line with
the centre of the rod N and the screw shaft À; and in consequence any crooks or
bends will be obviated and the bar require but little, or no straightening at all.
As soon as the screw shaft A has drawn the rod N through the die Q from one
side of the machine the other head of the shaft H' has arrived at the opposite die
seat 0¹ and is ready for the reception of a second rod thus rendering the work of
the machine continuous or double and the attendant workman merely has to shift
the belt on the pulleys R. R¹.
By making the screw shaft A hollow, rods of any length can be drawn.
By drawing the length of the screw shaft, then causing the latter to travel back
again, the drawn part of the rod passing then inside the hollow shaft, and by
clutching a further length of the rod the drawing operation is repeated until the
entire length has passed through the die.
Instead of actuating the machine by a screw shaft and worm wheel, a horizontal.
hydraulic cylinder of the same length as the rod to be drawn may be placed in the
middle of the machine and a piston works on either side through the heads of the
cylinder provided at either end with the jaws M. M; the piston being either solid
or hollow like the screw shaft.
The rods being drawn through a die of a smaller diameter than their own
section, are compressed, and in consequence their tensile strength and elastic limit
greatly increased, whilst the surface is equal to that of turned shafting; at the
same time the die being absolutely self centering they are perfectly straight and at
once fit for all uses for which turned rods are now required without any further
trueing or manipulation.
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. A machine for cold drawing rods and tubes, consisting of a double ended
screw shaft having a cross head secured upon each end and arranged to be operated
backwards and forward in the manner above described and. set forth in the
accompanying Specification and drawings.
2. In a machine for cold drawing rods and tubes, the arrangement and
construction of the double hinged die Q whereby it is enabled to adjust, itself

page_text: automatically to the line of draught during the operation of drawing the rod or
tube as shewn and described in Fig. 3 of the accompanying sheet of drawings.
3. The construction and general arrangement of a machine for cold drawing rods
or tubes substantially as shewn and described on the accompanying sheet of
Drawings Figs. 1 to 5.
4. In a machine for cold drawing rods or tubes, the use of a hollow screw shaft
or draw bar for the purpose of drawing rods or tubes of an indefinite length
substantially as described.
5. The use of a double acting hydraulic ram having suitable cross heads at each
end for gripping the rods or tubes to be drawn substantially as described in
accompanying Specification.