Improvements in Combined Drawing Board and Tee Square for Geometrical Drawing.
Year: 1895

page_text: Date of Application, 9th Aug., 1895
Complete Specification Left, 7th May, 1896-Accepted, 25th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in Combined Drawing Board and Tee Square for
Geometrical Drawing.
We JOSEPH CHARLES HOWARD of Park House Cowper Road, East Dereham
in the County of Norfolk, Engineer and WILLIAM FORD STANLEY of 4 and
5 Great Turnstile, Holborn W.C. in the County of London, Optician do hereby
declare the nature of this invention to be as follows :-
The object of our invention is to facilitate the operations of mechanical or
geometrical drawing, and to carry our invention into effect we construct
improved tee square and drawing board as follows:-
our
We make the drawing board with one end ledge grooved back to rebate over
the end of the board to bring part of the ledge a little nearer to the face of the
board.
This front part of the ledge is grooved with a wide and deep groove square
in section.
The tee square is made with the stock upon the upper surface of the blade
preferably to extend to the drawing edge only and is recessed to receive the end
of the blade and not below as usual, and a second stock of the ordinary form is
placed underneath this stock and affixed by a centre to the upper stock so that it
may move to set the blade to any desired angle and may be clamped in position by
a second screw. Through the centre attaching the two stocks a stout pin passes,
and affixed to this on the upper surface is a milled head and on the under surface
a cam preferably of metal. The lower stock of the squar runs with its working
edge upon the working edge of the board and the under surface is just clear of the
grooved projecting ledge while the cam projecting below the under stock runs in
the groove in the ledge. The cam is so placed thay when in any position except
one it runs perfectly free in the groove and the tee square may be used in every
way as an ordinary tee square but by a slight turn of the milled head the cam is
made to come in contact with the side of the groove farthest from the working
edge of the board thus forcing the stock hard up to the working edge and locking
the tee square in position in any part desired. If preferred the shifting head
arrangement may be omitted and in this case the blade would be fixed directly
to the lower stock and the pin carrying the milled head and cam simply pass
through it.
When the shifting head arrangement is used we prefer to put an index on the
two stocks which when opposite to each other shows the blade to be truly square
with the stock.
Various modifications may be made and any suitable materials used.
H. T. TALLACK,
10 Great Turnstile, Holborn, London, W.C., Agent for Applicant

page_text: DI MUTTICATION.
Improvements in Combined Drawing Board and Tee Square for
Geometrical Drawing.
We JOSEPH CHARLES HOWARD of Park House, Cowper Road, East Dereham
in the County of Norfolk, Engineer and WILLIAM FORD STANLEY of 4 and
5 Great Turnstile, Holborn W.C. in the County of London, Optician dc 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 our invention is to facilitate the operations of mechanical or
geometrical drawing, and to carry our invention into effect we construct our
improved tee square and drawing board as follows:
In the accompanying drawings
Fig. 1 is a perspective view of the board and tee square.
Fig. 2 is a plan of under side of tee square.
Fig. 3 is a section of Fig. 2 through line a b.
Fig. 4 is a section of Fig. 2 through line c d enlarged.
Similar letters denote corresponding parts throughout the drawings.
The drawing board A is made with one end ledge grooved back to rebate over
the end of the board to bring part of the ledge level with the face of the board.
This front part of the ledge is grooved with a wide and deep groove B square in
section.
The tee square is made with the stock D upon the upper surface of the blade O
preferably to extend to the drawing edge only and is recessed to receive the end
of the blade and not below as usual, and a second stock E of the ordinary form is
placed underneath this stock and affixed by a centre to the upper stock D so that
it may move to set the blade to any desired small angle limited to the length of
the slot in the upper stock D and may be clamped in position by a second screw I.
Through the centre H attaching the two stocks a stout pin passes and affixed to
this on the upper surface is a milled head or lever G and on the under surface a
cam F preferably of metal. The lower stock of the square runs with its working
edge upon the working edge of the board and the under surface is just clear of the
grooved projecting ledge while the cam F projecting below the under stock runs
in the groove in the ledge.
The cam F is 50 placed that when in any position except one it runs perfectly
free in the groove and the tee square may be used in every way as an ordinary
tee square but by a slight turn of the milled head or lever G the cam is made to
come in contact with the side of the groove farthest from the working edge of the
board thus forcing the stock hard up to the working edge and locking the tee square
in position in any part desired.
If preferred the shifting head arrangement of the tee square may be omitted
and in this case the blade C would be fixed directly to the lower stock E
and the pin carrying the milled head or lever G and cam F simply pass
through it.
When the shifting head arrangement is used we prefer to put au index on
the two stocks which when opposite to each other shows the blade to be truly
square with the stock.
Various modifications may be made and any suitable materials used.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is
1st. The use in combination with a drawing board and tee square of a groove

page_text: along the working edge of the board in which the stock of the tee square works
freely and the said stock of the tee square being provided with a cam which can
be actuated from above so that the cam may be brought into position to lock the
stock of the tee square in any position along the groove in the board.
2nd. The use in combination with tee squares of the shifting arrangement
and locking device of lower stock as shown in Fig. 3 of the accompanying
drawings.
3rd. The use in combination in tee squares of the cam arrangement as shown in
Fig. 4 of accompanying drawings.
4th. The improved drawing board and tee square substantially as herein
described and illustrated in the accompanying drawings.
Dated this 7th day of May 1896.
H. T. TALLACK,
10 Great Turnstile, Holborn, London, W.C., Agent for Applicants.