IMPROVEMENTS IN DRAWING BOARDS
Year: 1884

page_text: CHARLES TINDAL ATKINSON Engineer 7 Westminster Chambers Victoria Street
London S.W. do hereby declare the nature of my invention for IMPROVEMENTS
IN DRAWING BOARDS to be as follows:―
This invention consists of a process, hereinafter shewn by which paper may be
stretched for drawing or other purposes to any tightness or tension required and
this is effected by means of a screw, working on moveable frames as hereinafter
shewn.
Frame A as shewn in figures 1. 2 & 3 is grooved upon the inside surface and
fitting loosely into the frame is the drawing Board B as shewn in figures 1.
2 & 3 and which can be removed when required (as described in provisional Speci-
fication No 2416. (1884) upon the back of this board are arranged 4 moveable
pieces marked C Figures 1. 2 & 3 fastened to these are 4 moveable pieces
marked C¹ Figures 1. 2 & 3 the edges of which fit into the grooves in the frame A-
These moveable pieces are actuated by means of a screw marked D as shewn in
figures 1. 2 & 3 which turns upon a bolt marked G in figures 1. 2 & 3. These
moveable pieces could be actuated by a cam or some machanical contrivance of a
similar nature, but by preference a Screw. By means of this Screw the moveable
pieces C are forced into the grooves in the frame A The edges of the moveable
pieces are by preference slightly wedge shaped.
Letters E as shewn in Figures 1. 2 & 3 represent metal plates having teeth
projecting from them, which fit in between the threads of the screw D. these plates
are fixed to the moveable pieces, C. or could if desirable be prolonged and
attached directly to moveable pieces C¹ in that case dispensing with the moveablo
pieces C.
The Screw D upon being turned operates upon these teeth in such a manner as
to force the moveable pieces either backwards or forwards according to the direction
in which the Screw D is turned.
Letters F represent guides fixed upon the back of the board is such a manner as
to guide the moveable pieces in the proper direction and also to keep them from
leaving the back of the board.
If it is found desirable the moveable pieces might be grooved instead of the
frame in which case the frame would be made with a tongue upon the inside
surface as shewn in Figure 4.

page_text: In using the board the paper to be stretched is laid over the frame (the board
having been first removed) the board is then pressed upon the paper until the
moveable pieces are opposite the grooves in the frame The Screw D being then
turned the moveable pieces are forced a little way into the grooves forcing a portion
of the paper into the grooves at the same time until the paper becomes quite tight
and is held firmly in its place, the slightly wedged shaped formation of the edges
of the moveable pieces causes the board to be forced slightly in front of the frame A
which assists in tightening the paper.
One of the advantages derived from the application of the screw D to the
moveable pieces is that the paper can be stretched and tightened for all necessary
purposes and if the paper should become loosened from damp or otherwise the
application of the screw will stretch and tighten the paper to any extent for all
practical purposes.

page_text: CHARLES TINDAL ATKINSON Engineer 7 Westminster Chambers Victoria Street
London S.W. do hereby declare the nature of my invention for IMPROVEMENTS IN
DRAWING BOARDS and in what manner the same is to be performed, to bo
particularly described and ascertained in and by the following statement :-
This invention consists of a Frame A as shewn in Figs 1 & 2 grooved upon the
inside surface Fitting loosely into the Frame is the Board B as shewn in
Figs 1 & 2 and which can be removed when required. Upon the back of this
Board are arranged 4 moveable (sliding) pieces marked C Figs 1 & 2 fastened to
these and at right angles are 4 pieces marked C¹ Figs 1 & 2 The edges of which
are made to enter the grooves when required These moveable (sliding) pieces are
actuated by means of a Screw marked D as shown in Figs 1. 2 & 3 or by a cam but
by preference a Screw, by means of this Screw the Edges of the moveable (Sliding)
pieces are forced into the grooves in the Frame The edges of the pieces C₁ are by
preference wedged shaped, which has the effect of raising the frame up and
thereby assisting to tighten the paper Letters E as shewn in Fig 1. 2 & 3
represent metal plates having teeth projecting from them, and which teeth fit
between the threads of the Screw D. these plates are fastened firmly to the
moveable (sliding) pieces C. If preferred these metal plates might be prolonged
and fastened upon the pieces C in which caso the pieces C might be dispensed with.
The screw, D upon being turned operates upon the teeth in such a manner, as to
force the inoveable (sliding) pieces either back wards or forwards, according to the
direction in which the screw is turned Letters K. as shewn in Figs 1 & 2 are slots
through which a screw passes and is screwed into the Board B to assist guiding
the moveable (sliding) pieces C & C¹ these screws also assist in keeping the
moveable (sliding) pieces from leaving the back of the Board. Letters H shewn
in Fig 2 are flat rectangular pieces fastened to the back of the Board, by means of
screws, these also assist in guiding and preventing the moveable (sliding) pieces
from leaving the back of the Board. (These might be dispensed with if found
unnecessary) Letters G fig 1 & 2 represents a piece of wood or other material for
keeping the screw D in its place and also assists in guiding the moveable
(sliding) pieces and preventing them from leaving the back of the Board. Letter I
represents a Key or handle for turning the screw D. Letter L Fig 1 represents a
pivot for the screw to turn on if found necessary Fig 4 shews a plan in which
the frame A might be made with a tongue instead of a groove in which case the
moveable (sliding) piece Ct would be grooved.
To use the Board the paper or other material required to be stretched is laid over
the frame The Board being first removed, the Board is then pressed upon the
paper until the inoveable (sliding) pieces are opposite the grooves in the frame
the screw D being then turned the edges of the moveable (sliding) pieces C₁ are
forced into the grooves in the frame until the paper or other material becomes
quite tight and held firmly in its place.
The various parts above described can be made of metal, wood or other suitable
material.
Having particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is
(1) A Board over the surface of which can be stretched paper or other material,
which can be held, stretched tightly, and rigidly and firmly in its place,
in the manner herein before specified without fixing the paper or
other material on to the Board by adhesive matter or other means as
ordinarily used, the paper or other material not requiring to be previously

page_text: (2) Moveable (sliding) pieces actuated by a screw or cam for stretching and
holding stretched the paper or other material firmly, tightly and rigidly
over the surface of the Board by being forced into the grooves in the
frame as shewn above.
(3) a frame grooved upon the inside Surface as described in combination with
Inoveable (sliding) pieces.