Certain Improvements in and connected with Draw Bench Carriages.
Year: 1895

page_text: Date of Application, 4th Sept., 1895
Complete Specification Left, 4th July, 1896-Accepted, 4th Sept., 1996
PROVISIONAL SPECIFICATION.
Certain Improvements in and connected with Draw Bench
Carriages.
I, ALFRED SMALLWOOD, of Premier Tube Mills, River Street, Birmingham,
Warwickshire, Tube Manufacturer, do hereby declare the nature of this invention
to be as follows:-
This invention consists of the hereindescribed improvements in the gripper parts
of the carriages of draw benches for drawing metal tubes, rods, mouldings and the
like. By my invention the construction of the said grippers is simplified and they
are very readily connected on to the tube, rod, moulding or the like, which they
automatically release as soon as the tube, rod, moulding or the like has been drawn
through the die.
I will describe my invention in connection with a draw bench for drawing metal
tubes.
In carrying out my invention the said carriage is provided with a pair of wedge
shaped gripping jaws arranged side by side in a recess in the carriage the larger
ends of the wedges being towards the front of the carriage. The sides of the
recess are inclined towards the back of the carriage to suit the incline of the
wedges. The adjacent faces of the two wedge shaped gripping jaws are made
with backwardly inclined teeth so as the better to grip the tube or mandril when
placed between them.
To hold and draw the tube by the gripping jaws above described the end of the
tube is placed in the recess between the two jaws which are then pushed backwardly
so as to bear against the inclined sides of the recess and grip the tube between
them. Immediately the carriage commences to move forward, the tube being
gripped by the jaws tends to draw the jaws back so that their inclined sides act
against the inclined sides of the recess and they are thus wedged tightly against
the tube and hold the same very securely. When the tube has been drawn
through the die, and immediately the end of the tube leaves the same, the tube and
jaws spring forward slightly this releasing the tube from the jaws and carriage.
The said jaws may be connected to a lever jointed to the carriage by which
lever the jaws can more readily be placed in position to grip the sides of
the tube.
In order to reduce the friction I provide or I may provide between the inclined
sides of the gripping jaws and the corresponding inclined sides of the recess in the
carriage, a convenient number of hardened steel or other suitable balls or rollers
which the said wedge shaped gripping jaws move upon. These balls or rollers
may be carried by the jaws or by the inclined sides of the recess or they may be
carried by an independent frame or frames or be otherwise arranged so as to act
between the surfaces of the gripping jaws and inclined recess and reduce the friction
as stated above.
Dated this 3rd day of September 1895.

page_text: Certain Improvements in and connected with Draw Bench
Carriages.
I, ALFRED SMALLWOOD, of Premier Tube Mills, River Street, Birmingham,.
Warwickshire, Tube Manufacturer, 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 the hereindescribed improvements in the gripper parts
of the carriages of draw benches for drawing metal tubes, rods, mouldings and the
like. By my invention the construction of the said grippers is simplified and they
are very readily connected on to the tube, rod, moulding or the like, which they
automatically release as soon as the tube, rod, moulding or the like has been drawn
through the die.
I will describe my invention by referring to the accompanying drawings on
which
Fig. 1 is a back elevation and Fig. 2 is a sectional side elevation of a draw
bench carriage and gripping jaws constructed according to this invention; Fig. 3
is a plan of the same;
Fig. 4 shews one of the gripping jaws separately;
Fig. 5 is a sectional elevation and Fig. 6 is a plan of the back part of the
carriage shewing the gripping jaws gripping a tube whilst it is being drawn and
also shewing the lever which I use for pressing the jaws back to engage
the tube.
The same letters of reference indicate the same or corresponding parts in all the
figures of the drawings.
In carrying out my invention the back part of the draw bench carriage A is
provided with a pair of wedge shape gripping jaws B1 B2 arranged side by side
in the recess C in the carriage, the larger ends of the wedges B1 B2 being
towards the front of the carriage. The sides c c² of the recess C are inclined
towards the back of the carriage to suit the inclined sides of the wedges B¹ B².
The adjacent faces 3 of the wedge shaped gripping jaws B B² are made with
backwardly inclined teeth as shewn in Fig. 4 so as the better to grip the tube or
mandril when placed between them. Above the recess C there is fixed a cross
bard to prevent the gripping jaws B1 B2 from rising up, but at the front of this
bard the recess C is open at ca for the insertion of the lever F which presses the
wedge shaped blocks B B together to grip the tube as hereinafter described.
To hold and draw the tube by the gripping jaws B1 B2 above described, the end
of the tube E is placed in the recess Ċ between the jaws B1 B2 as shewn in Figs. 5
and 6 and the jaws are then pushed backwardly by the lever F inserted in the
recess C so that the wedges B1 B2 will then bear against the inclined sides c¹ c² of
the recess C and grip the tube E between them as shewn in Figs. 5 and 6.
Immediately the carriage commences to move forward in the direction shewn by
the arrows in Figs. 5 and 6 the tube E being gripped by the jaws tends to draw
the jaws together so that their inclined sides act against the inclined sides cl c²
of the recess C and they are thus wedged tightly against the tube and hold the
same very securely. When the tube has been drawn through the die and
immediately the end of the tube leaves the same the tube and jaws B' B' spring
forward slightly thus releasing the tube from the jaws and carriage. The jaws B¹ B³
are perfectly free in the recess C so as to readily spring forward as aforesaid when
the tube is drawn through the die.
The lever F which moves the jaws B' B' backwardly to grip the tube may as
shewn in Fig. 7 be jointed to the carriage by a fulcrum pin as f' fixed thereto."

page_text: 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 :-
The combination with a draw bench carriage of the two wedge shaped gripping
jaws B B carried in the recess C in the back of the carriage said recess having
its sides c¹² inclined towards the back of the carriage so as to cause the jaws B¹ B²
to close and grip the tube whilst the same is being drawn, substantially as herein-
before described and illustrated by the accompanying drawings.
Dated this 3rd day of July 1896.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.