UNIVERSAL DRAWING EDGE
Year: 1888

page_text: WILLIAM PALMER No 1 Greenvale Terrace Dumbarton Scotland Engineering
Draughtsman do hereby declare the nature of my invention for "UNIVERSAL DRAWING
EDGE" to be as follows
-
An improved means of connection between Blade and Stock of a drawing
instrument for use on drawing board, table or other sui face, thereby adapting it to a
wider range of uses than an ordinary "T" Square
The Blade and Stock are held together by a Bolt and nut or Screw Pin, with one
or more Spring Washers introduced, a Spring Washer may if desired do duty also as
as nut
The Spring Washer is made of thin steel or of any other material having the necessary
spring, and in form that of an inverted saucer
The Bolt hole in Blade is extended to a slot running right out, thus allowing the
Blade to be removed by simply relieving the Spring Washer of its load
By the introduction of the Spring Washer or Washers a sufficient range is
obtained between being hard screwed up, and of being slack, to admit of the pressure
being so adjusted that the angle of Blade can be altered without touching the Bolt or
nut, and at the same time be held sufficiently firm by the spring of the Washer or
Washers to work with
1000

page_text: WILLIAM PALMER No 1 Greenvale Terrace Dumbarton Engineering Draughtsman
I do hereby declare the nature of iny invention for AN IMPROVED "T" SQUARE" and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement
An improved means of connection between stock and blade of a drawing instrument
for use on drawing board, table, or other surface, thereby adapting it to a wider range
of uses than an ordinary "T" Square
The stock and blade are held together by bolt and nut, or screw pin,
with one or more spring washers introduced, a washer may if desired do duty also as
a nut
The spring washer "A is made of thin steel or of any other material having the
necessary spring, and in form that of an inverted saucer, the bolt hole "B" in blade
is extended to a slot running right out, thus allowing the blade to be removed by
simply relieving the spring washer of its lo id
The combined "st it onary wisher" and "lifting spring'"0" is made of thin
steel, or other suitable material, its duty is a washer is to prevent the nut "D" from
turning when the angle of blade to stock is altered, for the blade curios the spring
washer "A" around with it when altering the angle, the washer "C" being extended
and attached to toch is thus made stationary, and being placed between the spring
washer "A' and the nut "D" takes the friction on its under side, thus removing
tendency of the nut to turn, its duty as a lifting spring is to hold the spring
washer "A" up off the stock when the blade is removed, and thereby facilitating the
reinsertion of the blade,
all
By the introduction of the spring washer or washers a sufficient range is obta ned
between being hard screwed up, and of being sinch, to admit of the pressure being so
adjusted that the angle of blide can be altered without touching the bolt or nut, and
at the same time be held sufficiently firm by the spring of the washer or washers to
work with
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I