Improvements in Drawing-boards, Set-squares, Tee-squares, and other similar Drawing Implements.
Year: 1896

page_text: Date of Application, 15th Dec., 1896-Accepted, 13th Mar., 1897
COMPLETE SPECIFICATION.
Improvements in Drawing-boards, Set-squares, Tee-squares, and other
similar Drawing Implements.
We, ROBERT STUDTE, Merchant and AUGUST MAURER, Mechanician, both of
14 Brüderstrasse, Brunswick, in the Empire of Germany, 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 improvements in the construction of drawing boards, set-
squares, tee-squares, straight-edges, curves and the like which are made partly of
wood, papier maché or other similar material; and consists in enclosing such material
in a metallic frame which serves to protect the same from injury, and from the effects
of damp or heat.
The accompanying sheet of drawings illustrates various drawing implements with
the invention applied thereto.
Figure 1 shows a drawing board with part of the cover removed so as to expose
the internal metallic frame.
Figure 2 a section taken on the line x-x of Figure 1.
Figure 3 a set-square.
Figure 4 a section taken on the line y-y of Figure 3.
Figure 5 a set-square with opening through it.
Figure 6 a section taken on the line 2-z of Figure 5.
Figure 7 a tee-square, and
Figure 8 a modification of the frame shown in Figures 1 to 7.
The frame a (Figures 1, 2, 3, 4, 5, 7 and 8) and i (Figure 6) of T shaped cross
section, is provided on each of its sides with one or more webs bb' or k which
extend at right angles from the sides, and on which the wooden or other covering
part of the implement rests when in place. The webs may be level as in Figures 2,
4 and 6, or be provided with ribs such as o in Figure 8.
The drawing board, Figures 1 and 2, consists of a metallic frame a in which each
side is furnished internally with two webs b b which form with the sides rebates for
the reception of the upper and lower boards e c made of wood or other suitable
material. The diagonally placed corner pieces of the frame are connected together
by cross stays d in order to strengthen the frame, and increase the security against
deformation of the boards as these lie on the stays. The connection of the boards c c
to each other and to the frame is effected by means of screws 1, whereby the renewal
of either board is facilitated. Each of the boards e c¹ may be made of several pieces
jointed together.
In the set-square, Figures 3 and 4, each side of the metal frame a has only one
inwardly projecting web b, on which the two covering plates ff, made of wood or
other suitable material, are adapted to bear. The adjacent ends of the sides forming
the corners of the frame a are connected together by means of corner pieces n
soldered to the sides and let. into recesses in the covering plates. The space g between
the plates ff may be filled with cork shavings.
The set-square, Figures 5 and 6, has two frames a and i of T section provided
The webs b
with webs, the smaller i, of which frames is placed within the larger, a.
of the outer frame a project inwards whilst the webs k of the inner frame i project

page_text: -outwards and are not, like the webs b, connected together at the ends. The covering
plates made of wood or other suitable material fit against and bear on the webs of
the two frames.
The tee-square h, shown in Figure 7, is formed of two frames a placed at right
angles to each other, each of which frames are provided with webs b which receive
the covering plates of wood or other suitable material. The webs of the longer leg,
or blade, are connected together by means of stays d and corner pieces n. The
shorter leg, or stock, is fixed to the longer one by means of screws m or otherwise.
In the partly shown frame a, Figure 8, the webs have two projecting ribs o which
take into the covering plates ff of wood or other suitable material and thus effect
a firm connection of the frame with the said plates.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
First. In drawing boards, set-squares, tee-squares and the like, the combination
of a metallic frame of T section with wooden or other covering boards or plates,
fitted into and secured in the said frame substantially as described.
Second. In drawing set-squares and the like the combination of two
metallic frames of T section, with wooden or other covering boards or plates fitted
into, and secured between the said frames, substantially as described.
Third. In drawing tee-squares and the like the combination of two or more
metallic frames of T section connected together, with wooden or other covering
boards or plates fitted into, and secured in the said frames substantially as described."
Fourth. In drawing boards, set-squares, tee-squares and other similar drawing
implements the combination of a metallic frame of T section having ribs on its webs
with wooden or other covering boards or plates fitted into and secured in the said
frame substantially as described.
Fifth. In drawing boards, set-squares, tee-squares and other similar drawing
implements, the combination of a metallic frame of T section having stays to connect
the sides of the frame together with wooden or other coverings boards or plates
fitted into, and secured in the said frame substantially as described.
Dated this 154 d
R. STUDTE,
A. MAURER,
Per W. H. Beck,
115 Cannon Street, London, E.C., Agent.