Improvements in Drawing Tables.
Year: 1895

page_text: Date of Application, 7th Nov., 1895-Accepted, 14th Mar., 1896
Improvements in Drawing Tables.
We, SAMUEL JOHN LAUGHLIN, Mechanic, of Waterloo Avenue, and JAMES.
HOUGH, Printer, of Kent Street, both of the City of Guelph, in the County of
Wellington, in the Province of Ontario, Canada, 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 :—
Our invention relates to improvements in drawing tables and boards, and the
object of the invention is-first-to design a simple means of constructing the
table, so that a rectangular board may be used conveniently with a protractor-
secondly to improve the construction of the frame, so as to provide for the
change of slant of the top of the table and thirdly-to provide a simple means for
holding the instruments required for the draughtsman's use and it consists essentially
in the various details of construction as hereinafter described in detail and pointed.
out in the drawings.
We make no reference or explanation in this Specification of the moveable ruler
or straight edge or of the moveable side scale as these have already been covered
by a former Patent, No. 6422 of 1895.
=
Fig. 1, is a perspective view of a drawing table complete embodying our.
improvements.
Fig. 2, is an enlarged detail showing means whereby the rectangular drawing.
board may be held longitudinally parallel with the front of the table or at right
angles thereto.
Fig. 3, is a sectional plan showing the means of supporting the standard and
providing for the arrangement of the supporting rods for the trays for holding the
instruments.
Fig. 4, is a perspective sectional detail showing the manner of holding the
supporting braces in position at the bottom end.
Fig. 5, is a section through portion of the standard longitudinal connecting rail
and supporting bars for the trays for holding the instruments.
Fig. 6, is a detail of the slot and bracket for holding the drawing board.
In the drawings like letters of reference indicate corresponding parts in each
figure..
:
A is the top frame of the table and B is the rectangular drawing board, which is
supported on the frame B' comprised of the cross bars B and B and the con-
necting bars B. The front ends of the cross bars B' have blocks fastened to
them and the rear ends of such bars are provided with slots in which fit the
angular brackets 6.
is a thumb screw which extends through the base of the bracket and the
inner slot into the square nut in the wider slot beneath. By loosening this
thumb screw & the bracket may be moved longitudinally within the slot &.
Thumb screws 6° are also provided which extend through the brackets. The
rectangular board B is held on the frame B¹ between the blocks and the thumb
screws in the brackets ³. It will thus be seen that by means of the slots, and
the. brackets arranged and held as described, drawing boards of different sizes
may be provided and securely held in position.
The frame B is pivoted centrally upon the top frame A. D is a pointer secured
in the front end of the bar B' and extending downwardly to the protractor C.

page_text: E are rollers secured in recesses at each end of the bar 133 and Er
are rollers secured at each end of the central connecting bar B. Upon these
rollers the frame B' and consequently the board B rotates. F and G are
catches, the catches F being secured at each end of the central connecting
bar B and the catch G being secured at the rear end of the central cross bar B³.
The catch G is provided with a flat spring g and a thumb serew g', which extends
through the pointer to abut the spring g, and is used for the purposes of holding
the drawing board firm when the pointer D is set to any angle upon the
protractor C..
1 are spring rods secured at the outer ends in the plates 11 secured to the rear-
ward extension A* of the top frame A of the table. The spring rods I have their
inner ends threaded and pass through the blocks J provided with the notches j
with one of which the end of the catch G is designed to engage, so as to hold
the long edge of the drawing board parallel with the front and back of the table.
The block J is arc-shaped at the inner edge. i are nuts screwed on to the spring
rod I and abutting the ends of the block J. These nuts serve to prevent the
block J from moving longitudinally on the spring rod I and provide for a great
nicety in adjustment of the block, so as to bring the pointer D directly over the
zero mark on the protractor when the catch G is locked in notch j or when the
catch F is locked in said notch to bring the pointer D directly over the ninety
degrees mark on the protractor. ¹ are set screws extending through the rear
of the block to the rod and designed to hold such block from turning on the rod,
thus serving to present the notchj always opposite the catch G.
There are two spring rods I with their blocks J and two catches F secured to
blocks, the catch at the right hand of the figure and shown, being designed to
engage with the notch in the block J at the right hand side to bring the board B
at right angles to the front edge of the table frame A when turned in this direction,
and the opposite pointer F being so set relatively that when the board is turned
around in the opposite direction and such pointer comes opposite the notch of
the block J at the end of the spring rod I at the left hand side the board will be
also at right angles to the front and rear edges of the table frame.
The standard L has a T-shaped head into the end of which are inserted pins K.
kare jaws fastened to the cross bars of the table and fitting over the pins K.
This arrangement permits of the table being swung to any desired slant and also
of its being readily lifted on or off.
The top of the table is hinged and supported centrally upon these pins K inserted
into the top of the standard L. M are supporting arms pivotally secured between
the blocks m secured underneath the top of the table and having their lower ends
extending within a plate N one end of which is provided with a pin n fitting within
a corresponding hole n' in the leg of the table. O is a cross rod, which extends
from outside to outside through the front legs P of the table and O¹ is a sleeve
extending from inside to inside of the legs P through which sleeve the rod O
extends. The rod O at its outer ends also extends through the plate N and is
threaded and provided with a head upon one end and with a thumb nut o' at the
other. ³ are screws set into the legs and forming stops for the lower end of the
plate N. The supporting arms M extend between the pin n and the rod O. By
unscrewing the thumb nut of the arms may be raised or lowered, so as to cant the
front of the table to the slant desired whereupon the thumb nut may be screwed
against the plates and clamp such plates against the supporting arms M and
securely hold the table at the desired slant.
Q are holding trays for the instruments, which are hinged at the inner end on
the cross pieces q secured to the cross bars S between the legs at each end of the
frame of the table. R are supporting bars, which have secured at their outer ends
the supporting blocks which extend up to the bottom of the trays Q, so as to
hold then flush when the bars are thrown out as shown in Fig. 1. The bars R
extend through slots in the cross bars S into grooves t in the connecting rail T
and supplemental rail T¹ and are provided at their inner ends with laterally

page_text: extending pins r, which extend into short grooves t'in the rails T T' and thus
serve to limit their outward movement. By throwing the bars R inwardly, so that-
the blocks r come underneath the cross pieces q the trays Q may be thrown down
close to the legs.
The standard L is provided at the back with a strip and a strip 11 of greater
width secured to the strip 1. These, strips fit within a T-shaped groove u made
in the blocks U, which are attached to both the top and bottom longitudinal rails T.
The form of supporting the standard above described is very secure and easily
raised and lowered.
We do not, however, describe the manner of raising and lowering the standard
to adjust the height of the top of the table as it has been the subject matter of the-
said former Patent No. 6422 of 1895.
Having now particularly described and ascertained the nature of our said'
invention, and in what manner the same is to be performed, we declare that what
we claim is.
1. In a drawing table the combination with the top and a rectangular board
rotatably supported thereon, of a protractor secured in position in the top of the
table and extending forwardly of the front edge of the board and a pointer on the
front side of the board extending downwardly into proximity with the protractor-
as and for the purpose specified.
2. The combination with the top and a rectangular board rotatably supported
thereon, of rollers E and E' secured upon the table top beneath the drawing board,.
the catches F and G secured to the board and spring wire rods I provided with
end blocks J having central notches ; all arranged as and for the purpose
specified.
3. The combination with the drawing board and catches, of the spring rods I
provided with end blocks J with notches j and nuts i on the threaded end of the-
rod abutting the block as and for the purpose specified.
4. The combination with the drawing board and catches, of the spring rod I
provided with end blocks J with notches j and set screws ¹ extending through the
block J to the rods as and for the purpose specified.
5. The combination with the top and the drawing board swung upon the top of
the standard as shown, of the arms M pivotally connected beneath the drawing
board at the front thereof, the plates N and means for clamping such plates against
the supporting bars M as and for the purpose specified.
6. The combination with the top, and the drawing board swung upon the top of
the standard as shown, of the arms M pivotally connected beneath the drawing
board at the front thereof, the plate N and pins n¹ and screws n³ rod O and thumb.
nuts o all arranged as and for the purpose specified.
7. The combination with the drawing table and supporting legs and frame, of
the standard L provided with rear strips and fitting within the T-shaped groove
in the blocks U secured to the connecting rails T as and for the purpose specified.
8. In a drawing table the combination with the legs and frame, of holding trays Q
hinged at their inner ends upon the cross pieces q, the rods R provided with
supporting blocks and having their inner ends extending through slots s in the
cross bars S into grooves t and stop pins secured at the inner ends of the bars
and extending into the short grooves tas and for the purpose specified.
9. The combination with the top of the table and jaws & fastened to the cross.
bars, of the standard with the T-shaped head and end pins K over which the jaws k-
fit as and for the purpose specified..
10. The combination with the frame B' rotatably supported on the top of the
table, of the drawing board B and means upon such frame for holding the board.
rigidly thereto as and for the purpose specified.
11. The combination with the frame B' rotatably supported on the top of the
table, of the drawing board B and blocks b' secured at one end of the cross bars B*-
and adjustable brackets at the opposite end of the cross bars, both blocks and

page_text: brackets being designed to clamp the board rigidly to the frame as shown and for
the purpose specified.
Dated the 7th day of November 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.