Year: 1887

page_text: Dar, us, haities, and
I, ERNEST SANDKUHL, of No. 25, Regent Street, in the County of Middlesex,
Merchant, 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 improvements in machines for cold-drawing and com-
pressing metal bars, rods, shafting, tubes and wire and also in hydraulic mechanism
for actuating the same.
I will now proceed to describe my invention with reference to the accompanying
drawings in which the same letters indicate like parts in all the Figures.
Figure 1. is a general view of this invention applied to a double-acting drawing
press, Figures 2. and 3. are respectively a section and an end view of the head of the
machine, Figures 4, 5. and 6. are elevations, and Figure 7. a section of the cross
head, and Figure 8. is a section of the feed valve.
A. is the head of the machine, and B. is the piston rod to the end of which is
attached the crosshead C. carrying the grippers, the said crosshead works within the
frame D. The die e. which is arranged within the die holder el, has its exterior
surface slightly conical and the internal surface of the said die holder is made to
correspond therewith, thus obviating the necessity for fixing the die, which can be
easily taken out, and, when in working position, receives material support from the
die-holder, whence a much lighter die can be used than would otherwise be necessary.
The grippers F. F¹ are arranged within the cross-head C., and the external surfaces f.ƒ³
27

page_text: thereof are also conical and correspond with the internal surface of that portion of
the cross-head C. in which they are situated, so that the tension of the rod or tube
being drawn tends to make their grip tighter.
The head A. of the drawing machine forms a seat for the die holder e¹ which is
adjustable therein and can be secured in any desired position by the screws ...
which easily adjust the die holder to the position of the grippers F. F' which should
be exactly opposite. The die holder e¹ and its seat in A. are so formed that they
constitute a universal or bowl joint. The lever G., which is pivoted to the cross
head C., is connected with the pivoted levers H. H. by the connecting rods I. I., and
the opposite ends of the said levers H. H. are so arranged in connection with the
grippers F. F (which may be two or more in number) that on the forward or backward
movement of the lever G. the grippers will be moved forward to grip the end of the
rod or tube or backward to release the same. In connection with the frame D. is
the bar K. so arranged that when the cross-head C. has travelled sufficiently far,
according to the length of rod or tube to be drawn, the lever G will come into contact
therewith and will be moved back thereby releasing the end of the rod or tube. In
some cases, the bar K. is dispensed with and any desired movement of the lever G.
effected by hand.
The
The hydraulic mechanism constituting the second part of this invention consists of
the feed valve illustrated by Figure 8 which is a sectional view of the same.
valve is so constructed that when it is at rest the valve slide L. is in such a position
that the feed water from the pump which enters by the pipo M. passes out by the waste-
pipe N., as shown by arrows. By moving the lever P. in one direction the valve slide L
is placed so as to permit the feed water to pass into the port R. and thence into the
cylinder S. and coming into contact with the piston s. forces the same to the opposite
end of the cylinder, and the piston rod B. in its corresponding movement draws the
rod or tube through the die, the water at the opposite side of the cylinder escapes
through the port T. and waste pipe N. On the completion of the stroke of the piston
the pivoted lever U. is turned by the cross-head or other part of the mechanisin and
through the medium of the rod W. moves the valve slide L. back to its normal position,
and the machine stops. A rod or tube is then fixed in the other cross-head the
valve slide T. is moved in the opposite direction and the piston s. travels the reverse
way.
One end of the rod or tube to be drawn is tapered down and passed through the
die e. into the cross-head C. when it is secured by the grippers F. F'.
Although I have in the accompanying drawings shown my invention as applied to
a double acting drawing press, I do not desire to confine myself to such application
as it will be found equally suitable to single acting machines. It will also be readily
understood that the improvements connected with the die, die holder and head A. of
the machine and the cross head C. can be arranged to be actuated by mechanism,
other than the hydraulic feed valve and the cylinder S., such as, a screw shaft, cable,
chain or other suitable means for obtaining the desired power.
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 :-
1st. The construction and arrangement of the die-holder e¹ forming with its seat in
the head A. of the machine a universal or bowl joint, and the combination therewith
of three or more adjusting screws for regulating its position, substantially as herein-
before described and shown in the accompanying drawings.
Secondly. The arrangement of the cross-head C. of the piston rod B. sliding within
the frame D. in combination with the grippers F F lever G connecting rods I. and
levers H. H., the whole being arranged and operating substantially as and for the
purpose herein before described and shown in the accompanying drawings.
Thirdly. The arrangement of the bar K. on the frame D. for automatically moving
the lever G., substantially as and for the purpose hereinbefore described.

page_text: Fourthly. The regulating and reversing hydraulic gear consisting of the valve
slide L., the ports R. T., the pipes M. N., the rod W. and levers P. U., and the
arrangement thereof in connection with the cylinder S. and piston s., substantially
as and for the purposes hereinbefore described and shown in the accompanying
drawings.
And Fifthly. The combination and arrangement of parts constituting a cold-
drawing machine actuated by an hydraulic ram, substantially as and for the purposes
herein before described and shown in the accompanying drawings.
VAUGHAN & SON,
Agents for the Applicant.