An Improved Dog or Gripper for Use upon Draw Benches.
Year: 1894

page_text: Date of Application, 14th Apr., 1894
Complete Specification Left, 14th Feb., 1895-Accepted, 6th Apr., 1895
PROVISIONAL SPECIFICATION.
An Improved Dog or Gripper for Use upon Draw Benches.
We, ROBERT WOOTTON, of 99 Corporation Street, Birmingham, in the County
of Warwick, Merchant, and BENJAMIN HEWITT, of 72 Wiggin Street,
Birmingham aforesaid, Engineer do hereby declare the nature of our said
invention to be as follows:-
Our invention has for its object an improved dog or gripper for use upon draw
benches by which the tag of the tube or rod has an equal grip along its full lengthi
whether the tag be taper or parallel while the rod or tube is always drawn true
and square to the die. The action of our dog or gripper also obviates any sudden
jerk when the tube is gripped being at the same time direct in its action when
gripping.
In carrying our invention into effect we pivot a pair of jaws upon a carriage
between which jaws we mount a double wedge having a dual action, i.e. upon the
wedge being operated in one direction, the mouth of the jaws is opened by the
action of the one end of the wedge upon the front part of the jaws while
the operation of the wedge in the opposite direction closes the mouth of the jaws
by reason of the other end of the wedge acting upon the rear arms of the pivoted
jaws. The clutch for engaging with the draw chain is mounted in the wedge and
is crank shaped the one or horizontal edge having the notched end for clutching
the chain while the other or vertical end rises up in the form of an arm by the
knocking over of which the notch is raised from its engagement of the chain, the
same action carrying the wedge along and thereby opening the jaws. Upon the dog
or grip being placed in position for gripping the tube the crank handle is brought
back and the clutch end dropped into engagement of the chain when the other end
of the wedge comes into action and causes the jaws to grip the tube.
A gripping piece is pivoted at the front of each jaw which gripping piece is
serrated and shaped to fit the tube and by reversing these blocks upon their pivots
a different sized tube may be gripped without changing the pieces while the pivotted
pieces adapt their position to any incline upon the tube and thereby obtain an even
grip along the whole length of the tag.
To obviate friction we may provide rollers in the arms and jaws in such position
as to receive the action of the wedge.
1
1 100
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicants.
COMPLETE SPECIFICATION.
An Improved Dog or Gripper for Use upon Draw Benches.
We, ROBERT WOOTTON, of 99 Corporation Street, Birmingham, in the County
of Warwick, Merchant, and BENJAMIN HEWITT, of 72 Wiggin Street,
Birmingham, aforesaid, Engineer, do hereby declare the nature of our said invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
Our invention has for its object an improved dog or gripper for use upon draw

page_text: benches by which the tag of the tube or rod has an equal grip along its full length
whether the tag be taper or parallel while the rod or tube is always drawn true and
square to the die. The action of our dog or gripper also obviates any sudden
jerk when the tube is gripped being at the same time direct in its action when
gripping.
In carrying our invention into effect we pivot a pair of jaws upon a carriage
between which jaws we mount a double wedge having a dual action, i.e. upon the
wedge being operated in one direction, the mouth of the jaws is opened by the
action of the one end of the wedge upon the front part of the jaws while
the operation of the wedge in the opposite direction closes the mouth of the jaws
by reason of the other end of the wedge acting upon the rear arms of the pivotted
jaws. The clutch for engaging with the draw chain is mounted in the wedge and
is crank shaped the one or horizontal edge having the notched end for clutching the
chain while the other or vertical end rises up in the form of an arm by the knocking
over of which the notch is raised from its engagement of the chain, the same action
carrying the wedge along and thereby opening the jaws. Upon the dog or grip
being placed in position for gripping the tube the crank handle is brought back and
the clutch end dropped into engagement of the chain when the other end of the
wedge comes into action and causes the jaws to grip the tube.
A gripping piece is pivotted at the front of each jaw which gripping piece is
serrated and shaped to fit the tube and by reversing these blocks upon their pivots
a different sized tube may be gripped without changing the pieces while the pivotted
pieces adapt their position to any incline upon the tube and thereby obtain an even
grip along the whole length of the tag.
To obviate friction we may provide rollers in the arms and jaws in such position
as to receive the action of the wedge.
In order that our invention may be clearly understood and more easily carried
into practise we have appended hereunto a double sized sheet of drawings upon
which we have fully illustrated the nature of our said improvements together with
the mode of carrying the same into effect.
Figure 1., is a plan of our dog or gripper.
Figure 2., is a section on line 1-2.
Figure 3., is a sectional plan of same.
:
Our invention consists of a pair of jaws A, A, which are pivotted upon the
carriage B at a² and are provided with the lever arins A', A'. Between these jaws
and arms the wedge D is mounted so as to have a dual sliding action so that when
the wedge is operated or carried in the direction of the arrow W the jaws A, A,
are opened by reason of the action of the point d' of the wedge against the jaws A
while the operation of the wedge by the draw chain in the direction of the arrow X
causes the jaws A to grip the tube which is effected by the action of the wings
of the wedge D. The clutch or lever E for engagement with the draw chain is
pivotted to the wedge D at el and is provided with the handle e and clutch e the
latter for engaging with the draw chain and the former for allowing of the knocking
up of the clutch and the consequent disengagement from the chain which action at
the same time draws the wedge D back and thereby releases the tube as before
described. Upon the dog or grip being placed in position for gripping the tag, the
- crank handle is operated so as to drop the clutch into engagement with the
draw chain which action brings the wings d of the wedge D into action and causes
the jaws to immediately grip the tag. A gripping nose F is pivotted at the front
of each jaw, being serrated and shaped to grip the tube at f By the reversal of
these blocks F upon their pivots, various sized tubes may be gripped without
changing the blocks by means of the varied size of groove fou the reverse of
blocks as shown by Figure 4. The pieces F being pivotted also to adapt them-
selves to any bend in the tube and thus obtain an even grip along the whole length
of tube. The gripping lever E may be made to act by the vertical action of the
arm in place of the horizontal motion when necessary.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1st. An improved dog or gripper for use upon benches, substantially as and for
the purpose herein set forth and shown upon the accompanying drawings.
2nd. In dogs or grippers for use upon draw benches the duplex wedge D
substantially as and for the purpose herein set forth and shown.
3rd. In dogs or grippers the pivotted nose pieces F substantially as and for the
purpose herein set forth and shown.
Dated this 6th day of February 1895.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicants.