An Improved Attachment for Tee Squares.
Year: 1899

page_text: Date of Application, 3rd July, 1899
Complete Specification Left, 3rd Apr., 1900-A'ccepted, 5th May, 1900
An Improved Attachment for Tee Squares.
I, THOMAS HEWLETT RODEN, Schoolmaster, 33, Byrkley Street, Burton-on-
Trent, Staffordshire, do hereby declare the nature of this invention to be as
follows:-
In drawing lines on blackboards. (or on other boards resting on easels) by
means of an ordinary tee square the left hand has usually to be kept at the stock
end of the tee square or firmly pressed' against the blade.
This is a disadvantage as the blade is liable to slip, especially when a set square
is used along it.
My invention is an attachment to prevent this slipping, and to enable the left
hand to be released from the stock when in use.
In the accompanying sheet of drawing, Fig. 1 is a side view and Fig. 2 is a back
view of the apparatus in use.
A is a plate firmly attached to the stock. Raised at right angles to A are two
projections.m & n, parallel to each other, through which passes the pin p. Hinged
upon this is B, which, by means of the spring C, is caused to press against the
'back of the board at r.
The stock end of the tee square thereby firmly grips the board, and is released'
at will.
•
:
The different parts would be made of iron, steel, brass, or any other suitable
metal or material. The exact form of spring indicated in the drawings will not
necessarily be used as other forms will effect the same purpose. Further I do
not restrict myself to the precise shape, relative proportion, or disposition of the
various parts described, as they may be considerably varied without departing
from the spirit of my invention.
An Improved Attachment for Tee Squares,
I, THOMAS HEWLETT RODEN, of 33, Byrkley Street, Burton-on-Trent, in the
County of Stafford, Schoolmaster, 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:-
My invention has for its object an improved attachment for tee squares which
is particularly applicable for use in the case of drawing lines on blackboards or
other similar articles which require to rest on casels. In such cases under exist-
DQ77

page_text: ing circumstances the left hand is required at the stock or head end or to be
firmly pressed against the blade to support the tee square in the required position
and is under the disadvantage that the blade is liable to slip especially when
using a set square upon it at the same time. To obviate these disadvantages my
improvement provides for an attachment to the stock end of the tee square
which retains the blade in the required position without being held by hand and
at the same time allows the tee square to be slid up and down as required.
In order that my invention may be clearly understood and more easily carried
into practice I have appended hereunto a sheet of drawings upon which I have
fully illustrated the nature of my said invention.
Figure 1 is a broken off view of the back of part of a blackboard with the tee
square attached.
Figure 2 is an elevation of the attachment partly broken away to show the
fixing plate.
.1..
Figure 3 is a section through Figure 1 on the line 1-2.
Figure 4 is a section through Figure 2 on the line 34.
In carrying my invention into effect the plate a is firmly attached to the
stock upon which the two projections m and are provided parallel to each
other..
!!!!!
:
The gripping plate 6 is hinged to the projections m and n by the connecting
pin with the spring carranged intermediately between the two by which means
the plate b is caused to press against the back of the band at r and thus grip the
stock d to the board e.
At the same time the attachment is free to slide up and down the board when
the résistance of the spring is overcome by means of pushing the stock up or
down by hand or by pressing down the lever part of the gripping plate b.the
tee square 9 can be removed entirely from the board e at will.
The attachment may be made of any suitable material and the shape of, the
plates a and b and the spring c and other parts may be varied without departing
from the nature of my said improvements.
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
An improved attachment for retaining tee squares on black boards and the like
consisting of a base plate fixed to the back of the stock and having a plate pivoted
thereon with, an intermediate spring the whole arranged so as to grip the board
between the pivoted plate and the blade of the tee square substantially as and for
the purpose herein set forth and shown.
T
LEWIS WM. GOOLD,
Agent for Applicant, 5, Corporation Street, Birmingham.