An Improved Drawing Board.
Year: 1893

page_text: Date of Application, 31st May, 1893-Accepted, 29th July, 1893
COMPLETE SPECIFICATION.
An Improved Drawing Board.
We, CARL OSCAR PEGER, Architect of 33 Wucherstrasse, and FRANZ ALBERT
BAUERMANN Engineer, of 31 Friedrichstrasse, both in Halle on the Saale, in the
German Empire, 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:-
This invention relates to a drawing board having none of the disadvantages of
those used hitherto.
Drawing boards as used hitherto require the paper to be fastened to them by
means of drawing pins or paste. The protruding heads of the drawing pins interfere
with the free movement of the T square, further it is difficult to make the drawing
paper lie flat on the board, and erasing loosens the attachment of the paper, in
consequence those parts of the paper which are raised higher than the others
become easily dirty and the production of clean, neat and exact drawings is
rendered difficult.
These disadvantages generally obtain if the paper is fastened to the boards with
drawing pins, and though they may be avoided to a considerable extent by the use
of adhesive paste the attachment of the drawing paper to the board with such
paste after the paper has been moistened with water is difficult and liable to
failure.
Further, if the latter method is used it is necessary to wait until the sheet has
dried, and if the board with the sheet is exposed to radiating heat to accelerate the
drying, there is the probability of the paper breaking or becoming wrinkled or loose
at the edges.
Drawing boards made according to our invention avoid the above disadvantages;
and in order that our invention may be the better understood, we now proceed to
describe the same, reference being had to the accompanying drawings and to the
letters and figures marked thereon.
Figure 1 is a perspective view of the drawing board, without adjusting device for
horizontal or oblique position.
The rods c and d are shown removed from their proper position.
Figure 2 shows the right hand side of the board with the rod d in position.
Figure 3 shows the rod d as seen from above.
Figure 4 is a view of the left hand side of the drawing board with the rod c in
position.
Figure 5 is a section of the drawing board in the direction from the lower edge
to the top edge, and shows the stretching device with screw e.
Figure 6 shows the stretching device for use with the rods c.
Figure 7 shows side and back elevations with device for adjusting the position of
the board and with holder for models or sketches etc.
Figure 8 shows a side view, section and plan of the key for operating the
stretching device.
The construction and use of the board is as follows:-
The sheet of drawing paper to be used is cut so that a margin of from 15 to
20 millimetres is allowed to protrude over the top and also over the lower edge of
the board.
This protruding margin is not required for the right and left hand sides.
The upper fastening rod a, Fig. 1, is lifted at one end until it is about vertical.
The protruding margin of the sheet of drawing paper is then carefully bent over
the outer edge of the flat rod f forming the upper end of the board.
The sheet is now held firmly with the hand at the upper edge where it has been

page_text: bent over, and the fastening rod a is lowered, so that the teeth of the same pierce
the paper at its upper edge and engage in corresponding slots in the flat rod f. thus
fastening the sheet of drawing paper along its whole length at the top.
The lower fastening rod 6 is now lifted, the sheet of drawing paper smoothed
down towards the lower edge, the protruding margin bent over the angular bar
g
and the fastening rod b is used exactly as the rod a has been used. The sheet is
thus attached at top and bottom.
By turning the screws e Figures 1 and 5, by means of the key illustrated in
Figure 8, the angular bar g is moved so that the sheet of drawing paper is stretched
tight by the fastening rod 6 which holds it.
The said key is provided with a perforating device which is inserted successively
into the holes on the left hand side of the board Fig. 1 to 4 in such a manner that
the upper movable part of the key handle which has been lifted is depressed and
the paper perforated so that the sockets h of the rod c can be passed through and the
rod itself secured in position by means of screws i.
After the right hand rod d has been placed in position the screws i serving to fix
the same Fig. 2 and 3, are passed through the slots & and the paper below them and
screwed into the nuts h.
The sheet is now fastened down on all sides.
If it is desired to take it off it is only necessary to reverse the preceding
operations, and if it is afterwards desired to refasten the same sheet, this can be
easily done, it being only necessary to take care that the teeth of the fastening
rods are again passed through the holes previously made by them in the paper.
In this manner it is possible to fasten a sheet of drawing paper perfectly stretched
without moistening it.
In a modified manner we may use such rods as c and d, Figure 1, for the two
other sides of the board, dispensing with the fastening rods a and b and the angular
bar g
In this case the back of the sheet including the fastening margins is
moistened with water, and it is then secured on to the board by the four fastening
rods, the stretching being effected by the natural contraction of the paper during
drying.
Figure 7 illustrates how the diawing board can be placed at any convenient
angle by means of the rod 1, and further how the holder m can be placed horizon-
tally or at any angle by the adjusting device n, according as to whether the holder m
is to carry a model or sketches.
Having now particularly described and
tion and in what manner the same is to
we claim is :—
ascertained the nature of our inven-
be performed we declare that what
1. A drawing board for the fastening and stretching of drawing paper thereon,
having fastening rods ab which are pivoted at one end and hold the sheet and
stretch it in combination with the angular bar g and tightening screws e by means
of which the said fastening rods can be operated to perfectly stretch the sheet of
drawing paper on the board substantially as described.
C
2. In such a drawing board as claimed in Claim 1, the rods c and d in com-
bination with the rods a & b claimed in Claim 1 or equivalently another set of rods c
and d. the screws i and nuts h to fasten and stretch the sheet of drawing paper, slots
being provided in the rods to allow for the change in the dimensions of the drawing
board due to contraction or expansion consequent on changes in temperature
substantially as described.
3. The construction and arrangement of a drawing board substantially as described
and illustrated in the accompanying drawings.
J
1000
FELL & WILDING,
Agents for the Applicants.