An Improved Clamp for Drawing Together Wooden Joints.
Year: 1889

page_text: Date of Application, 27th Nov., 1889
Complete Specification Left, 6th Dec., 1889-Accepted, 18th Jan., 1890
PROVISIONAL SPECIFICATION.
An Improved Clamp for Drawing Together Wooden Joints.
THOMAS DODDRELL Postmaster Slough Bucks do hereby declare the nature of this
invention to be as follows :-
A screw bolt about four inches long with a winged nut. The point of the screw
bolt to be reduced so as to form a shoulder. A washer and plate to be fitted on the
reduced part to withstand the pressure and form a flat bearing on the articles to be
joined. In the other end of the screw is a hole through which a steel pin is passed
for the purpose of screwing up. Two uniform strips of iron with holes about two
inches apart up the centre and a slot or oval shaped hole at the top end the slots or
oval shaped holes to be threaded or hung on the wings of the nut. A block of hard
wood with a steel pin wedged through it ecentric from the edges, and about an inch of
the pin to project each side of the block. These projections to be inserted in the
corresponding holes of the strips of iron and the block turned either the thick or thin
side up to suit the breadth of the articles to be joined. The screw bolt may now be
screwed up and joint or joints will be drawn together equally on each side.
Should extra length be required several of these strips can be joined with small
screw nuts thus avoiding their being made in great lengths.
Dated this 26th day.
J
1000
COMPLETE SPECIFICATION.
An Improved Clamp for Drawing Together Wooden Joints.
THOMAS, DODDRELL Postmaster Post Office Slough Bucks 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 :-
A screw bolt about four inches long with a winged nut. The point of the screw to
be reduced so as to form a shoulder. A washer and a small iron plate to be fitted
easy to the reduced point to withstand the pressure and so form a flat bearing on the
article to be joined. At the other end of the screw is a hole through which a steel
pin is passed for the purpose of screwing up. Two strips of iron with holes about
two inches apart up the centre. The top hole to be oval shaped so as to hang free
on the wings of the nut. A block of hard wood with a steel pin wedged through
it eccentric from the top and bottom edges and the ends of the pin to project about
an inch each side of the block. The ends of the pin to be inserted in the corre-
sponding holes of the iron strips and the block turned either the thick or thin side up
according to the breadth of the article to be joined. The screw bolt can now be
screwed up and the article which rests on the block and between the iron strips will
be drawn together equally each side. Even if the joint or joints have not been
properly prepared it will nevertheless draw up true, and the prepared surfaces adopt
themselves to each other. The iron strips need not be made over three feet long as
several can be joined together with a small nut and bolt. The clamp can be made to
any size or strength.
A is the plan of clamp.

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 screw bolt with washer and iron plate fitted to the reduced point and the steel
pin passed through the hole in the other end. The winged nut on which the perforated
iron strips are hung. The block of wood with steel pin through it for drawing
together wooden joints as described.
Dotad this 5th day of December 1889.
THOMAS DODDRELL.