Improvements in or relating to Drawing Boards or Drawing Tables, and in Ruleis or Straight Edges therefor
Year: 1895

page_text: Date of Application, 1st May, 1895-Accepted, 6th July, 1895
Improvements in or relating to Drawing Boards or Drawing Tables,
and in Ruleis or Straight Edges therefor
We HIRAM WADDINGTON of Grant Street, Accrington, Joiner and Builder,
and RICHARD DIGGLE of Lemonius Street, Accrington, Joiner, do hereby
declare the nature of our said invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement
-
Our invention relates to a drawing board, drawing table or the like, with a ruler or
straight edge moving uniformally across the face of the board by menus of toothed
pinions and racks to enable a number of lines to be diawn parallel to each other
and enable vertical lines to be drawn therefrom with a set square, without any
anxiety upon the part of the user is to " squareness
,
And in order that our said invention shall be the more readily understood and
carried into practical effect we have hereunto annexed a sheet of drawings and
vill now proceed to describe the same with the assistance of the various figures
and letters of reference mailed thereon
Fig 1 is a plan view, and Fig 2 a side view of a drawing bound with a straight
edge or ruler applied thereto in accordance with our invention
Fig 3 is an enlarged side view of one end of the board, and Fig 4 is a plan
Fig is an under plan of the straight edge and Fig 6 transver e section
In accordance with our invention we take a ruler or straight edge (A) of any
convenient outline or section, and of a length slightly less than that of the drawing
board (B) To each end of this ruler we apply a small toothed wheel or
pinion (C) having one half of its periphery plain, and with the other half formed
with teeth as illustrated, and such toothed part slightly less in diameter than the
other part
These pinions we mount upon the respective ends of a rod (D)
running beneath or through the substance of the ruler in bearings (E), (E)
and (F)
At each end of the board is formed an open ended channel or groove (G) into
which the pimons (C) take, and along on side of this groove a toothed 1nch (H)
The teeth of these racks are
is fixed, with which the teeth of the pinions mesh
parallel with each other, and correspond in pitch with those of the pinions hence
when gearing together the ruler is moved uniformally up and down the board
rolling, the plain parts of the pinions run upon the bottom of the channels (G) and
being of a greater diameter than the toothed parts as aforesaid, only permit the
pinion teeth to partially enter those of the racks, thus giving to the ruler a steady
This
surface movement and preventing any noise by the gearing of the teeth
construction of pinion is an important feature of our invention, for besides affording
the advantages afore aid, it enables the ruler to be used apart from the board for
ruling diagonal lines, or for general ruling purposes To permit of the ruler
readily passing over drawing paper and pins, the pinions are made sufficiently large
to hold the ruler clear of the board, or the channels (G) ale made sufficiently
shallow
To keep the ruler in gear with the lacks and on the board when in use we
provide each end thereof with a tong or hook projection (I) forming part of the
bearings (L) and (E) and turning inwards as illustrated so as to take into open
ended recesses (J), (J) and such projections are slightly curved an 1 lie clear of
the board at all points so as to prevent any friction, or retarding of the ruler

page_text: movements The insertion and withdrawal of these projections into, or out of the
recesses (1) is effected through the open ends of such recesses at the top or bottom
edge of the board
The ends of the board are formed as shewn more clearly in Fig 3 so that the
board may be used with an ordinary T square, the parts (K) being screwed to
the board proper by screws (K'), and the end strips (L) being screwed to the
parts (K) by screws (L') with the racks (H) clamped between them
To keep the ruler perfectly still when a line is being drawn or to lock it in any
desired position, we provide a set screw (M) the point of which may be screwed
against the rod (D) and so prevent its turning Instead of screwing against the
rod the screw may serve to tighten a collar on the rod
The racks and pinions are made of vulcanite, hard rubber, wood or other
similar material which will render the movements of the pinions more or less
noiseless Instead of being mounted on one common axis, they (the pinions) may
be on separate axes, but the arrangement would not be so reliable
Our invention is equally applicable to black boards and the like, the straight
edge or ruler if desired being balanced by weights
Having thus particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim and desire to secure by Letters Patent is
-
1st The diawing board herein before described with parts (K), end strips (L)
and racks (H), forming channels (G) and recesses (J), substantially as and for
the purposes hercinbefore described and illustra ed on the accompanying drawing
2nd The combination with said drawing board of a straight edge (A) fitted
with wheels (C), rod (D), tongs or projections (I) and screw (M) mounted and
operating substantially as and for the purposes herein before described and
illustrated on the accompanying drawing
Dated this 30th day of April 1895
HIRAM WADDINGTON,
RICHARD DIGGLE,
By John G Wilson & Co,
Agents