Improvements in Appliances employed in connection with the Drawing of Metallic Tubes.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Appliances employed in connection with the
Drawing of Metallic 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 the trollies employed in the process of drawing metallic
tube and which grips the tagged end of the tube after the same has been passed
through the drawing die, and has for its object, an automatic tag-end-gripping
lie or jaw.
In carrying out my invention in connection with a trolley to be used with an
ordinary draw-plate, draw-bench and endless chain, the said trolley runs upon
the usual metal, and has at the front, a lever hook counterpoised at the after end
and turning upon a pivot centre mounted at the said fore part of the trolley:
the said hooked end being adapted to engage with one of the links of the endless
chain, and to be disengaged therefrom on the motion of the chain ceasing and
becoming slack. The after end of the trolley has a conical socket or horizontally
disposed chamber or box with an eye or hole through the rear part, coming
axial with the eye of the draw-plate, and fitted within the interior of the said
chamber or socket is a segmental or split die or gripper, with the segments of
the same having channels on their presented faces, cut with ratchet-teeth raking
backwards and adapted to grip upon the tagged end of a billet or partly drawn
tube on the same being brought together or closed, this being accomplished by
the outer periphery of the sections of the gripping die being coned to correspond
with the inside coning of the chamber or socket, and with the taper opening out
from front to back, so that when a tag is held between the sections of the die.
the resistance offered by the tube being drawn, drags the jaws into the narrower
part of the chamber and so automatically grips the tagged end.
Then after the tube is drawn, the chain is allowed to slack, when the simple
re-action moves the die back inside its socket and releases its sections.
The automatic bringing-together of the sections of the die, may be performed
in any equivalent way, such as by the ends of inclined and jointed levers wiping
over separated studs on a fixed part of the trolley framing.
L lf Airbus 1802
ALFRED SMALLWOOD,.
By Henry Skerrett,
Agent for Applicant..

page_text: Improvements in Appliances employed in connection with the
Drawing of Metallic 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 the trollies, slides or holders employed in the process
of drawing metallic tube and other lengths and employed for the purpose of
gripping the end, or the tagged end of the tube or the like after the same has
been passed through the drawing die, and has for its object, to provide an auto-
matic ing-end-gripping jaw.
Figure 1 of the accompanying drawing represents, in elevation, a portion of a
tube drawing bench, the trolly of which is provided with an automatic gripping
device for laying hold of the tagged end of the tube, constructed according to
one form of my invention.
Figure represents the said trolly partly in elevation and partly in vertical
section and shows more clearly the construction and arrangement of the tube
end grip.
Figure 3 is another view of the said trully, upon the same scale as Figure 2,
but showing the same in plan with the gripping device in horizontal section.
Figure 4 is a plan and Figure 6 an elevation of one of the jaws or loose gripping
pieces separately.
Figure 6 is a like section as shown in Figure 3, but with the parts in different
positions.
17.
The same letters of reference indicate corresponding parts in the several
figures of the drawing.
In the said figures, a is a trolley, which is used in connection with an ordinary
draw-bench, draw plate &', die and endless chain c, and is provided with
wheels or rollers d, which run upon the usual metals . At the front of the
frame is a lever hook al, counterpoised at the after end and turning upon a
pivot centre, mounted between the side walls of the said frame, the said hooked
end being adapted to engage with one of the links of the endless chain, and to
be disengaged therefrom on the motion of the chain ceasing and becoming slack
as is usual with ordinary trollies. The after end of the trolley at is provided
with an integral or attached socket or horizontally disposed chamber or box d,
having inclined or inside coned walls (see Figures 3 and 6) with an eye or
hole, through the rear part, coming axially fignable with the eye of the
draw-plate, and fitted within the interior of the said chamber or socket is a seg-
mental or split gripper . made up in this case of a pair of loose jaws or wedge-
shaped pieces, with the sides opposed to the inclined sides of the box made
of a corresponding inclination or outside taper, whilst the other and opposed
fnees, are cut with ratchet teeth raking backwards and adapted to auto-
matically grip or lay hold upon the tagged end of a billet or partly drawn
tube, on the pull being put upon the trolly this being accomplished by opposed
surfaces the loose jaws and fixed body part of the gripping device, being coned
to correspond with out another.
Thus, after the tagged end of a tube has been introduced between the separated
jaws, as in Figure 6, the jaws are brought by means of a suitable tool introduced
through the clearance a², to the narrower and of the chamber and against the
tag, which is loosely held thereby. Then, when the trolley commences to move

page_text: forwards on being dragged by the chain, the resistance offered by the tube being
drawn, drags the jaws still further into the narrower part of the chamber and
brings them closer together and against the tagged end, which is thereby auto-
matically and efficiently gripped.
Then after the drawing of the tube is completed the chain is allowed to slack,
when the simple reaction moves the wedge-shaped jaw sections back inside and
towards the broader part of the chamber, so that their grip upon the tag is relieved
and the tube may be disconnected from the trolley.
Instead of employing only a pair of gripping sections, I may any other con-
venient number of loose sections. The apparatus is also applicable for gripping
the ends of rod lengths, or the ends of mandrils employed in drawing processes
generally.
Instead of the opposed surfaces both being inclined or tapered as described,
the one may be parallel and the other taper. Or the gripping sections may be of
the shape represented in Figure 7, in which, are the inside coned walls of the
box or chamber and el, are the gripping sections, whilst Figure 8 represents a
section of another modification in which the inside walls of the chamber d,
are parallel, but it has a contracted mouth, whilst the gripping jaws e,, are
of a wedge shape, with inclined outer walls, but with parallel and ratchet toothed
inner presented sides or gripping surfaces.
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 Automatically gripping the end of a tube or other length, or mandril,
by the employment of sectional grips or loose jaws located within a box, chamber
or carrier and through the medium of inclined planes or surfaces, formed either
upon the grips or jaws, or upon the walls of the chamber or carrier, or upon both,
substantially as described and set forth.
Secondly-In trollies, slides or holders for use in connection with the draw-
ing of metallic tubes or lengths, providing the same with an inside-tapered
chamber or box, wherein a pair or number of outside tapered loose jaws or grip-
ping pieces are located, and between which, the tagged or other end of a tube or
length, or the end of a mandril is automatically gripped on pulling action being
set up, substantially as described and set forth."
FARS
ALFRED SMALLWOOD,
By Henry Skerrett,
24, Temple Row, Birmingham, Agent for Applicant.