Improvements in Drawing Boards.
Year: 1895

page_text: Date of Application, 22nd Aug., 1895
Complete Specification Left, 21st May, 1896-Accepted, 27th June, 1896
1, THOMAS JACKSON 41, Wesley Road, Armley, Leeds, in the County of York,.
Lecturer on Engineering do hereby declare the nature of this invention to be as
follows:-
My invention refers to the class of battened drawing boards in which provision
is made, by means of screws passing through metal slots and holes in the battens,.
to allow for expansion and contraction of the wood.
In such boards as ordiuarily made the holes provided in the battens to allow for
expansion and contraction are of the elongated form known as "slot holes" and a
small metal guard plate with a similar slot hole is provided for the head of each
screw to work on. To prevent the heads of the screws projecting beyond the face
of the batten the metal guard plates or "slots are recessed in cavities usually of
similar shape to themselves.
"
The improvements which are included in my invention are as follows
1st. Round holes of sufficient diameter are formed in the battens and used in
conjunction with screws having loose round metal washers, in lieu of the elongated
holes and fixed metal slots usually used.
2nd. To prevent the loose washers and screwheads projecting beyond the face-
of the battens I provide each batten with one or two ledges which run the whole
length of the batten. The expense and trouble of recessing separate cavities for
each screw &c. is thus avoided and a smooth and truly plane face for the metal.
washers to slide on readily secured.
Dated this 21st day of August 1895*
Improvements in Drawing Boards.
I, THOMAS JACKSON, of 41, Wesley Road, Armley, Leeds, in the County of
York, Lecturer on Engineering 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 :-
My invention refers to the class of battened drawing boards in which provision
is made, by means of screws passing through metal slots and holes in the battens,
to allow for expansion and contraction of the body of the board. In such boards
as ordinarily constructed, the holes provided in the battens to allow for expansion
and contraction are of the elongated form known as "slot-holes" and a small metal
guard plate with a similar slot hole is provided for the head of each screw to work
To prevent the head of the screw projecting beyond the face of the batten
the metal plates are usually recessed in cavities of similar shape to themselves.
The improvements which constitute my invention are as follows:-
on.
(a.) Round holes of sufficient diameter are formed in the battens and used in
conjunction with screws provided with loose round metal washers (see sketch), in
lieu of the elongated holes and fixed metal slots ordinarily used.
מ.

page_text: (b.) To prevent the loose washers and the heads of the screws projecting beyond
the face of the battens i provide each batten with one or two ledges (see sketch)
which run the whole length of the batten. The expense and trouble of recessing
separate cavities for each screw head and washer or plate is thus easily avoided
and a smooth and truly plane face for the metal washers to slide on readily
secured.
My improvements as above described, are intended to secure greater cheapness
of production.
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 :-
(1.) In battened drawing boards the use of the combination of round holes, screws
and washers as above described.
(2.) In battened drawing boards the use of the ledged battens as above
described.
THOS. JACKSON.