Improvements in or relating to Vertical Drawing Boards and to T-Squares for use therewith
Year: 1889

page_text: Date of Application, 12th Feb., 1889
Complete Specification Left, 12th Nov., 1889-Accepted, 25th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in or relating to Vertical Drawing Boards and to
T-Squares for use therewith.
SIDNEY MANTHORP COCKBURN 2 Princes Mansions Victoria Street, Westminster
Engineer do hereby declare the nature of this invention to be as follows:-
This invention consists in mounting an ordinary standard size drawing board on an
easel, the board being balanced by a weight attached to the board by a cord, and
taken over a pulley on the top of the easel. The board can thus be moved up and
down at pleasure On the board is mounted an ordinary Ṭ square but with parallel
blade and a stock of the same size and weight at each end. The square is balanced
by two weights attached to the stocks of the square by two cords and taken over two
pulleys carried on two arms secured to the top of the board. By these means the
square can be moved up and down at pleasure. The square is pressed against the edge
of the board by the left hand, and is used in precisely the same way as the ordinary
board and T square. The advantage being that the draughtsman can stand or sit at
his work in an upright position and always have the part of the board on which he is
working opposite his face.
1
1
1000
COMPLETE SPECIFICATION.
Improvements in or relating to Vertical Drawing Boards and to
T-Squares for use therewith.
SIDNEY MANTHORP COOKBURN 66, Victoria Street Westminster Engineer 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:-
The object of my invention is to enable a draughtsman to work at a drawing board
either standing or sitting without the necessity of stooping and to have his work
always opposite his face, on whatsoever part of the board he may be working.
To carry out my invention I construct the apparatus shewn in Figs. 1-2 and 3
consisting of a suitable easel on which is mounted an ordinary drawing board with
aT square of special construction. The board is balanced and moves easily and
freely up and down the easel, the T square is also balanced and moves easily and
freely up and down the board.
The construction of the said apparatus is as follows :—
The easel is of suitable height and strength to carry the size of board to be used
there on.
In front of the easel is a hinged frame which serves to prop up the board
as shewn in fig. 3 and as hereinafter described.
On the top of the easel is a pully over which passes a cord attached to the board
and carrying a weight which balances the weight of the board, T square and other
parts. The cross pieces on the back of the board act as lateral pieces against the
edges of the easel.
A shelf conveniently placed is constructed in the easel to hold instruments.
The board is an ordinary engineers drawing board. To the upper part of the board
are secured projecting pieces of wood or horns carrying at the upper ends, pulleys
over which pass cords attached to the T square and carrying weights which balance
the weight of the T square.
To the top edge of the board are secured 2 brackets, through which pins may be
inserted into the easel, thus hinging the top edge of the board to the easel, the

page_text: lower edge of the board then being raised and the before mentioned hinged frame
put into pince, the board serves as a drawing table as shewn in fig. 3.
The square has a parallel blade and a stock at each end of the same size and
weight also a small shelf for instruments and set squares.
To each stock of the T squaro is attached a cord, taken over the before mentioned
pulleys on the horns and carrying weights which balance the T square.
The weights work in tubes or on rods secured to the board, so that when the board
is converted into a table as in Fig. 3 the weight in the T square is relievod and it is
then used in the ordinary way.
To more clearly explain the foregoing description 1 refer to figs. 1-2 & 3.
A. is the easel, B the drawing board, C. the T square D the balance weight for tho
board E the tubes in which work the balanco weight for the T square. F. is the
hinged frame, G the horns, H. the brackets secured to the top edge of the board. I is
the shelf on the T square J the shelf on the easel.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declair that what 1
claim is :-
1st. The combination of the easel, board and Ț square with their several fittings
substantially as described.
2nd. The balanced T square substantially as described.
3rd. The means employed and the combination of the hinged frame the brackets
secured to the top edge of the board and the tubes or rods substantially as described.
Dated this 11th day of November 1889.
S. MANTHORT GOONBURN.