Improvements in Mounting and Arranging Drawing Boards, and in Appliances in connection therewith.
Year: 1891

page_text: Date of Application, 3rd Dec., 1891
Complete Specification Left, 3rd Sept., 1892-Accepted, 8th Oct., 1892
PROVISIŲNAL DIEUITIQAHỤN.
Improvements in Mounting and Arranging Drawing Boards, and in
Appliances in connection therewith.
We, ARTHUR PATSCHKE, of Wurzen, and WILHELM EICHNER, of Leipzig-
Gohlis, both in Saxony, in the Empire of Germany, Engineers do hereby declare
the nature of our said invention to be as follows:-
The object of our invention is to mount and arrange drawing boards in an
improved manner, and to fit the same with improved appliances for the convenience
of draughtsmen and artists.
Our invention consists in mounting the drawing board upon a suitable frame.
The front lower end of this frame is hinged to a table or stand, in order that the
drawing board may be supported in any position and at any angle, from a horizontal
to a vertical position. An adjustable support is hinged to the back of the table,
and also to the back of the drawing board frame. The drawing board is partly
supported and balanced by counter weights attached to lines running over pullies.
An adjustable sliding straight edge is mounted upon the drawing board or its frame,
and is balanced by counter weights attached to lines, and so arranged that it may
be placed at any height on and square to the board, or diagonally thereto, as
required. This straight edge is used as a substitute for a T square, and is mounted
on rollers so as to be held a short distance from the board to prevent smearing the
wet ink. Provision is also made for preserving the parallelism of the straight edge,
by means of cords and pulleys, independently of the counter-balance weights.
The straight edge is provided with a channel, in which set squares may be placed
and caused to assume any required position. A channel or groove is also provided
at the lower end of the board frame, for retaining various drawing instruments and
other articles which are frequently required.
Bolts, screws, flynuts, and other adjusting appliances are provided for fixing the
straight edge in any required position; and drawers are fitted in the frame of the
table for containing drawings, paper, and other articles.
Dated Rud Desember 1901
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.
COMPLETE SPECIFICATION.
Improvements in Mounting and Arranging Drawing Boards, and in
Appliances in connection therewith.
We, ARTHUR PATSCHKE, of Wurzen, and WILHELM EICHNER, of Leipzig-
Gohlis, both in Saxony, in the Empire of Germany, Engineers, do hereby declare
the nature of our said invention and in what manner the same
performed, to be particularly described and ascertained in and by the following
statement:-
is to he
The object of our invention is to mount and arrange drawing boards in an
improved manner, and to fit the same with improved appliances for the convenience
of draughtsmen and artists.
Our invention consists in mounting the drawing board upon a suitable frame.
The front lower end of this frame is hinged to a table or stand, in order that the
drawing board may be supported in any position and at any angle, from a
horizontal to a vertical position. An adjustable support is hinged to the back of
the table, and also to the back of the drawing board frame. The drawing board is

page_text: 4
partly supported and balanced by counter weights attached to lines running over
pulleys. An adjustable sliding straight edge is mounted upon the drawing board
or its frame, and is balanced by counter weights attached to lines, and so arranged
that it may be placed at any height upon, or diagonally thereto, as required. This
straight edge is used as a substitute for a T square, and is herein after, for
covenience of description, referred to as a "T square." It is mounted on rollers,
so as to be held a short distance from the board to prevent smearing the wet ink.
Provision is also made for preserving the parallelism of the T square, by means
of cords and pulleys, independently of the counter-balance weights.
The T square is provided with a channel, in which set squares may be placed
and moved into any required position. A channel or groove is also provided at
the lower end of the board frame, for holding various drawing instruments and other
articles frequently required.
Bolts, screws, Hynuts, and other adjusting appliances are provided for fixing the
Tsquare in any required position; and drawers are fitted in the frame of the
table for containing drawings, paper, and other articles.
And in order that our said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawings, in which
similar letters of reference indicate corresponding parts.
Fig. 1 is a sectional elevation, and Fig. 2 a front view of our invention.
Fig. 3 is an enlarged detail section of the T square and some of its appendages;
and Fig. 4 is a front view of the same, partly in section.
Fig. shows one method of balancing the T square and securing its parallelism
by means of a single endless cord.
Fig. 5 is a detail view, showing the balancing cord with the rollers and counter-
weights.
Fig. 6 is an end view of Fig. 5.
Fig. 7 shows another method of balancing the T square, and securing its
parallelism by a single endless cord.
Fig. 8 is a section on the lines I II III and IV of Fig. 7.
Fig. 9 is an enlarged view of a portion of the T square; and Fig. 10 is a section
of the same.
The apparatus is fitted to and supported by a table A. One or more drawer
or drawers B, for drawings &c., is or are fitted in this table. A writing or
sketching board C is also fitted, as shown in Fig. 1.
The sketching board C is fitted with ledges C¹ C³, which, by contact with the
rails of the table frame, cause the board, when drawn outwards, to leave its
horizontal position, and to approach a vertical position, so as to permit of the
draughtsman making large drawings or sketches without inconvenience. The
board C may be fitted with a balanced and parallel-guided T. square, as herein
described in relation to the drawing board G.
D is a frame hinged or pivoted at a to the table A. The frame Dis
supported at any suitable angle by the adjustable support E, pivoted to the
frame D at b A clamp is pivoted to the table at e, in which the bars d are
capable of sliding. These bars have holes e formed therein for receiving
regulating pins or screws, to adjust their position in the clamp f.
G is a drawing board, capable of sliding upon the frame D. This board is
balanced by counterweights F and guided in parallel positions by the endless
cord passing over pulleys gl to mounted on the fixed frame D, and by the
guide pulleys i fixed to the drawing board G (Figs. 1 and 2).
The drawing
board may be raised or lowered as required, retaining the position in which it
is placed.
The T square is similarly balanced and guided.
to
Referring to Figs. 5 and 6, it will be seen that the parallel guidance of the
Tsquare is effected separately from its balancing. A cord k, fixed at
the square H, passes successively from over the pulleys m² m² and m³ to l
where it is fastened to H. From thence it passes over the pulleys m m³ and mº,

page_text: back to on H, where it is again fastened. The pulleys are so arranged that the
cord is in contact with the drawing board G, and neither presses the T square
against the drawing board, nor holds it away from the same..
"
The balancing of the T square, and pressing the same against the drawing board
(which becomes indispensable when the latter is in a nearly vertical position) is
effected by means of four other pulleys n, o, n' and o', and of a cord p p. The
pulleys n, o, n', o, are so arranged on both sides of the drawing plane or surface of
the board G, that the cord p p falls in the direction of motion of the locking bolts
and of the T square. The cord p p is fastened to Hat and land passes
upwards over the pulleys and o and down to the counterweights g and ',
continuing from thence over the pulleys n and n', and returning to the attach-
ments on H. This arrangement of the pulleys and cord ensures the T square
being sufficiently pressed upon the drawing (as shown in Fig. 6) and also being
suitably balanced. Upon the bolts and are placed the guiding rollers 12, 13,
which guide the T square laterally, to prevent horizontal motion. A slot is
formed near the right hand end of the T square, through which the bolt may be
passed when the † square is required to be placed obliquely, as shown by dotted
lines in Fig. 2.
In Figs. 7 and 8 another arrangement is shown, whereby the balancing and
parallelism of the T square are secured by a combination of an endless cord and
pulleys. The cord r passes successively from its attachment to the T square H
at 1, over the pulleys to the bolt (Figs. 9 and 10) and thence over the
pulleysss, returning to the bolt on the left. Between the pulleys and s
and the pulleys and ³, counterweights
are suspended to the cord r.
These weights are fitted with rollers or wheels to reduce the friction, and the
rollers u u run in bevel grooves and v', in order to prevent the lateral movement
of the counterweights.
and
The square, in both arrangements, is fitted with a device which keeps the
surface of the T square off the drawing board, and maintains it in such a position
that only its bevelled edge can rest against the drawing board. The device consists
of the relieving rollers to and w arranged end wise upon the under surface of the
Tsquare. When the latter is moved, it is turned upon its longitudinal axis in the
direction indicated by the arrow in Fig. 8. The edge of the square bearing upon
the drawing surface is raised so that the square can be moved without being in
contact with the drawing. The relieving rollers w w may also have their ends in
the centre of the rear surface of the T square, and either the upper or the lower
edge of the T square may be made to bear upon the drawing surface. The
relieving rollers may also be arranged above the T square and be guided by a
special bar. The rollers ww at the same time relieve the friction between the
Tsquare and the drawing surface, whereby the T square is guided in an accurately
parallel direction; thus entirely avoiding all liability to depart from its true
position, square to the board, and enabling it to pass over wet lines or surfaces,
without smearing the same.
The T square has two grooves formed therein, as shown in section in Fig. 3.
The upper groove y accommodates the lower bar z of the set square K, in which it
slides; the groove also preventing the set square falling off the board. The lower
groove is useful for receiving drawing appliances, such as scales, pencils, protractor,
rubber and the like. A similar groove J is formed at the lower end of the
drawing board, for a similar purpose.
A frame P is suspended upon the upper part of the drawing board G, by a
cord m, attached to counterweights N, the cord passing successively over the
pulleys of to 0. Upon the frame P the sketch, drawing, or model to be copied
may be placed. The cord m is fitted to both sides of the frame at S, S, and T, T;
and hooks Q are arranged at suitable distances apart, to which a stretched cord R
may be attached, which prevents the frame P falling from the board.
A lamp U may be provided, as shown in Figs. 1 and 2, supplied with gas or
electricity by means of the pipe or conductor V shown in Fig. 2.

page_text: Having now particularly described and, ascertained the nature of our said inveu-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. A drawing apparatus characterized by a movable drawing board G held in
equilibrium by a counterweight F and a cord or band passing over rollers or
pulleys, and sliding on a drawing frame D, upon which drawing board is arranged
a drawing ruler H likewise held in equilibrium by the counterweight 9 and g' and
the cords or bands p and pl passing over suitable pulleys or rollers, substantially as
herein before described and illustrated by the drawings.
2. The combination of the drawing board G with a ruler H furnished at one end
with a slot ', so that the ruler may be placed diagonally upon the board after the
bolt is released, substantially as herein before described and illustrated by the
drawings.
.
3. The combination of the drawing ruler H with the pressure rollers w and w¹
rolling on the drawing board and fixed at the ends of the ruler so that only the
edges of the latter may bear on the drawing surface, substantially as herein before
described and illustrated by the drawings.
4. The combination of the ruler H with a groovey in which the set square is
held for the purpose of raising the set square as well as the ruler H and of
preventing the former from separating from the latter, substantially as herein
before described and illustrated by the drawings.
5. The combination of the drawing frame D secured by hinges to a fixed frame A
with an upper frame E which is connected by the hinges with the drawing
frame D and by the hinges with the fixed frame A, the hinges e serving as guides
for the sliding bars d of the upper frame E which are furnished with perforations e,
and holding the same in different planes or heights by means of the screws f
substantially as herein before described and illustrated by the drawings.
6. In a drawing apparatus having a drawing board capable of horizontal
adjustment, a ruler held in equilibrium and guided in parallel directions by means
of an endless cord or band moving over rollers 3 to 5 and carrying the
weights tt, the latter weights t and being provided with rollers and ¹ which
run as well as the pressure rollers w and w³, in conical grooves v v¹, and v² v³,
substantially as herein before described and illustrated by the drawings.
7. The combination of a drawing board arranged upon the frame D secured to
the axed frame A, with a writing or sketching board C furnished with angular
ledges or bars C' for the purpose of adjusting the last mentioned board at any angle
between a horizontal and a nearly vertical position, when the said board C is
withdrawn from the fixed frame A, substantially as herein before described and
illustrated by the drawings.
8. The combination of the ruler H furnished with a groove y and pressure
rollers wand ¹ with the guide rollers and 13 arranged upon the bolts and l' and
guiding the ruler laterally, substantially as herein before described and illustrated
by the drawings.
Dated 3rd Santambor 1802
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.