IMPROVED MEANS FOR STRETCHING AND HOLDING PAPER OR SIMILAR MATERIAL UPON DRAWING BOARDS
Year: 1884

page_text: "
COMPLETE SPECIFICATION.
I, RUDOLF SCHMITZ WEROTTE of N° 5 Finborough Road in the County,
of Middlesex Mechanician do hereby declare the nature of my Invention for
IMPROVED MEANS FOR STRETCHING AND HOLDING PAPER OR SIMILAR MATERIAL
UPON DRAWING BOARDS" and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :.....
According to my Invention paper or similar material is stretched upon a drawing
board by turning the edges over and clamping them either to its back or to its
straight edge, or to a surface or surfaces in connection with its back or straight
edges by holding pieces or strips which are caused to press against the said back
or surface or surfaces in connection with the straight edge, the paper or other
material intervening. The surface or surfaces against which the holding pieces or
strips press the paper or other material may be either the timber of which the
board is formed, or a special surface or surfaces provided for the purpose.
Referring to the accompanying Sheet of Drawings Fig. 1 shews one corner of
the back of a board constructed according to my Invention. Fig. 2 a part of one
side. Fig. 3 another corner with the clamping device removed; Fig. 4 a third
corner shewing two clamping devices and Fig. 5 a section of the edge of the board.
The holding devices or strips a. a bear, when in position, against the surfaces b. b.
formed at the back of the board, and as shewn, they lie by preference each in an
angle or recess. Where cutting into the drawing board is objectionable an
abutment for the clamping strips is formed by laying suitably shaped ledges of
any suitable material such as wood or metal under the tightening devices and
holding strips as shewn in elevation Fig. 6 and in section Fig. 7. Also in Figs. 6*
& 7 and in Fig. 7b.
It will be evident that various forms of clamping devices and modes of attaching
the same to the drawing board, may be employed in conjunction with the holding
pieces or strips a. Thus in Figs. 1, 2, 4, 5, 6 and 7 plates c. with ledges overlapping
the pieces or strips a are tightened by nuts d fitting on to screws c. According to
Fig. 8 screws having hooks at one end to overlap the strips a are tightened by
nuts d at the other end; and according to Figs. 9, 10, and 11 the clamping plates c
turn on hinge pins c¹ held in ears of hinged plates f, fastened to the back of the
board, and formed with inclined parts f¹. f. between which and the tail piece c²
a wedge is inserted to cause the plate c to tighten against the strip a.

page_text: In order to stretch paper on a board such as above described it is after being
thoroughly soaked in water, laid out flat upon a table and the drawing board is
placed on the top of it. The waste at the corners is cut out and the edges of the
paper are turned right over the board with a sufficiently broad border to come
within the grip of the clamping pieces.
The holding. pieces or strips are then laid into the angle or recess and by the
application of the clamping devices the paper is securely gripped all round the
board. When the paper is quite dry and set one or more of the strips may be
removed without disturbing the paper and another sheet of tracing paper or cloth
may be stretched over the first.
Having now 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. The use in combination with a drawing board of holding pieces or strips for
holding upon it paper or other material that has been stretched over the face and
edges of such board substantially as described above, the arrangement being such
as to dispense with the use for securing the paper or other material upon the board,
of adhesive substance, or of drawing pins, or of a frame surrounding the edges of
the board as above set forth.
2. The combination with a drawing board of holding pieces or strips and
clamping devices arranged and operating substantially as described.
.3. The improved means for holding paper or other material upon drawing
boards, substantially as herein above described with reference respectively to and
illustrated in Figs. 1 to 5 inclusive in Figs. 6 and 7 in Figs. 6ª & 7ª in Fig. 7º in
Fig. 8 and in Figs. 9 to 11 inclusive of the Drawings for the purpose set forth.