Improvements in or relating to the Mounting of Drawing-paper.
Year: 1891

page_text: Date of Application, 29th Oct., 1891
Complete Specification Left, 30th May, 1892-Accepted, 2nd July, 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Mounting of Drawing-paper.
I, THEODOR HESS of No. 9 Puchmayergasse, Weinberge near Prague (Bohemia)
in the Empire of Austro-Hungary, Professor by Imperial Appointment, do hereby
declare the nature of this invention to be as follows:-
To mount drawing-paper upon the board various methods have hitherto been
employed. It was fixed either by means of drawing-pins, or by means of stretching
frames, or simply pasted on to the board.
According to this invention sheets of drawing-paper previously moistened may be
secured to the board in a perfectly smooth and even manner without any special
appliances or instruments.
the paper
For this purpose the drawing-board is provided with a hinged frame which, when
is laid upon the board, is folded down upon it and clamps the sheet at its
edges.
The apparatus consists of a board provided at its edges with projections or ribs,
and a hinged frame provided at its edges with corresponding grooves so that the
two pieces exactly fit each other in the closed condition, that is when the frame is
turned down. When the moistened sheet of drawing-paper is stretched over the
board and the frame is turned down upon it, the edges of the sheet enter the
grooves and are securely retained therein by the ribs of the board.
This fastening frame at the same time when closed is arranged to form one
continuous plane surface with the board so as to give the whole as nearly as possible
the appearance of one piece.
The frame is retained upon the board by means of slides or buttons capable of
adjustment in dove-tailed grooves provided for the purpose in the board and frame.
In a modification the board is provided with one offset or rib only which the
corresponding rib of the frame is arranged to fit by occupying the angle formed by
the offset; so that here again when connected, they present one continuous smooth
surface.
The paper as before explained is gripped between the frame and the offset edge
of the board so that the paper is secured and stretched as it were automatically.
The better to attain this result spring-controlled fasteners or catches are provided
on the sides of the frame and adapted to enter corresponding recesses in the board.
Each of these fasteners or catches consists of a metal plate having a central slot
with inwardly bent lugs through which are passed the ends of a spiral spring. Into
this central slot is inserted a plate or clasp upon which the spiral spring constantly
presses.
To prevent this clasp from being forced out of the slot entirely, it is provided
with projections at its base. The spiral spring is wound around a pin secured in the
sides of the clasp. The operation of this fastening device is such that as the frame
is being closed the edge of the board first pushes the fastener back into the recess;
but owing to the action of the spiral spring, the moment the frame is pressed home
on to the board, it springs forth again and catches in a notch provided for it. To
make the fastening still more secure hooks may be arranged to connect the frame
and board, this, however, is immaterial.
Deted this 20th dox of October 1871.
W. P. THOMPSON & BOULT,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to the Mounting of Drawing-paper.
I, THEODOR HESS of 9 Puchmayergasse, Weinberge, near Prague (Bohemia),
in the Empire of Austro-Hungary, Professor by Imperial Appointment, 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:-
To mount drawing-paper upon the board various methods have hitherto been
employed. It was fixed either by means of drawing pins or by means of stretching
frames or simply pasted on to the board.
According to this invention sheets of drawing-paper previously moistened may
be secured to the board in a perfectly smooth and even manner without any special
appliances or instruments.
For this purpose the drawing-board itself is provided with a hinged frame which
when the paper is laid upon the board is folded down upon it and clamps the sheet
at its edges.
In the accompanying drawings,-
Fig. 1 is a plan of the board and Fig. 2 an inverted plan thereof.
Fig. 3 is a section on line x-x of Fig. 1.
Fig. 4 is a section on one of the movable or sliding pieces of the frame, on line y-y
of Fig. 2.
Fig. 5 is a section on line z z of Fig. 2 with the frame raised or opened.
Fig. 6 is a similar partial section on an enlarged scale (real size).
Fig. 7 is a plan of a modification of the board, of which arrangement Fig. 8 is a
perspective view, and
Fig. 9 a section on line u u of Fig. 7.
Fig. 10 shows the locking or fastening arrangement from the front.
Fig. 11 shows the same arrangement from the back and
Fig. 12 is a section on line vv of Fig. 11.
The apparatus consists of a board A provided at its edges with projections or
ribs a and a hinged frame B provided at its edges with corresponding grooves b so
that the two pieces exactly fit each other in the closed condition that is when the
frame is turned down on to the board.A. When the moistened sheet P of drawing-
paper is stretched over the board A and the frame B is turned down upon it, the
edges of the sheet P enter the grooves b and are securely retained therein by the
ribs a of the board.
This fastening frame at the same time, when closed, is arranged to form one
continuous plane surface with the board so as to give the whole as nearly as possible
the appearance of one piece.
The frame is retained upon the board by means of slides or buttons capable of
adjustment in dove-tailed grooves e provided for the purpose in the board and frame.
Fig. 2 shows these sliding fasteners as being applied to one side of the board and
as occupying the position which they should assume when the frame is turned down,
while the end fasteners at k are shown as being withdrawn from their respective
grooves or notches e.
When the sliding fasteners are in this position the frame may be opened by being
turned on its hinges.
The modification illustrated in Figs. 7 to 12 consists in providing the board &
with one offset e only which the corresponding rib d of the frame is arranged to fit
by occupying the angle or rebate d formed by the offset; so that here again when
connected the board and frame present one continuous smooth surface.
The paper P as before explained is gripped between the frame B and the offset
edge of the board A as in Fig. 9 so that the paper is secured and stretched as it
were automatically. The better to attain this result spring-controlled fasteners or

page_text: catches are provided on the sides of the frame and adapted to enter corresponding
recesses q in the board. Each of these fasteners or catches consists of a metal
plate; having a central slot or opening with inwardly bent lugs through
which are passed the ends of a spiral spring f. Into this central slot is inserted the
plate or clasp m upon which the spiral spring f constantly presses so as to restore it
to the position in which it appears in Fig. 10.
To prevent this clasp from being forced out of the slot 4 entirely it is provided
with projections n at its base. The spiral spring fencircles a pin o secured in the
sides of the clasp m. The operation of this fastening device will be clearly under-
stood from the drawing. As the frame is being closed the edge of the board first
pushes the fastener back into the recess p but owing to the action of the spiral
spring the moment the frame is pressed home on to the board, it springs forth again
and catches in the notch q (Fig. 12). To make the fastening still more secure
hooks may be arranged to connect the frame and board this however is immaterial.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is,-
1. The combination with a drawing board having around its edges ridges and
grooves a of a frame having inverse grooves and ridges adapted to fit upon the
drawing board and grip the paper between the two whereby a more secure hold is
obtained upon the paper than with a plain half check or rebate.
2. The combination with a drawing board A of a frame B hinged to the said
board the board and frame being provided with mutually fitting grooves and ribs
which serve for clamping between them the drawing paper P and dovetailed slides
such as s for securing the frame and board together substantially as described and
illustrated in the accompanying drawings.
3. The combination with a drawing board having at its edges only one rib or
offset c and frame B fitting thereon to retain the paper placed on the board of spring
controlled clasps or fasteners such as S adapted to spring into or engage in corre-
sponding recesses i provided in the board A substantially as described and illustrated
in the accompanying drawings.
Dated this 30th day of Mer 1892
W. P. THOMPSON & BOULT,
Agents for the Applicant.