Improvements in and connected with Tee Squares.
Year: 1897

page_text: Date of Application, 8th Jan., 1897-Accepted, 27th Feb., 1897
COMPLETE SPECIFICATION.
Improvements in and connected with Tee Squares.
I, WILLIAM KENDRICK, Marine Engineer, Barry House, Gordon Road, West
Cowes, Isle of Wight 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 :-
In employing a tee square it is frequently required to keep it steady in one
position while using a set square along its edge, and difficulty is sometimes found
in doing this owing to the fact that when pressure is brought to bear on the blade,.
it is liable to slip down, almost imperceptibly and thus cause the drawing to get.
considerably out of truth. In order to obviate this inconvenience, I proceed in
the following manner, making reference to the accompanying sheet of drawings,.
in which Fig. 1 is a plan of the tee square, Fig. 2 a side view, Fig. 3 an end
view, and Fig. 4 a plan of the runners to be hereafter explained, and Fig. 5 an
edge view of the tee square, runners and drawing board. Similar letters indicate
the same parts where they occur.
I prolong the length of the blade of the tee square so that it extends beyond
the edge of the drawing board and in this prolonged part I form a slot a in the
direction of the length of the blade. In the slot I have two flanged runners b
and b, the bottom flanges ce¹ being fixed and the top ones d d' removable for
convenience in assembling the parts together. At the stock end of each of the
flanges c¹ is a downward hanging projection e el at right angles to the flanges.
Projecting away from and at right angles to the projection e is a pin f, of sufficient
length to pass through both of the projections e el; half the length 9 is of larger
diameter than the other half h, a spiral spring i occupying the space between the
end of the larger half off and the projection e', through which the smaller part
passes, the extreme outer end of h being furnished with a stop j to prevent the
smaller end being entirely withdrawn. Attached to the centre of each runner and
projecting upwards through the upper flanges, are the screwed stems k and k¹,
furnished with the thumb nuts and . Passed over is one end of a flat spring m
the other end extending beyond the end of e and having the upturned extremity n.
Below that part which extends beyond c is a projection o of about the same thick-
ness as the flange c. The flanges d d are kept from rotating round k and k', by
having holes in them which slip over projections p p' rising from the runners, 6 6.
There is a slotted opening q in the spring m larger than the base of thumb
nut. The appliance is used as follows;-The runners are pushed to the outer
end of the slot in the blade. The square is then placed on the board r and the
runners pushed back until the projection e is at a distance from the edge of the
board rather less than equal to the width of the projection o on the spring m.
The thumb nut is then tightened and the upturned end n of spring m raised thus
allowing the projection e to be pushed out by the spiral spring i and so causing e
The tee square will now be
to strike against and press the edge of the board r.
found to be firmly held in position without liability to be pushed down while work
is proceeding along the upper edge of the blade, and when moving the square up.
or down the board, the spiral spring will adapt itself to any variation in the width
of the board, and should the square be struck either up or down it will still remain
parallel to the line or lines previously drawn.

page_text: It is proposed to have the runners of metal such as brass, but they may be of
other suitable material or materials, and the spring may be of steel or hardened
brass. I do not restrict myself to the precise shape, relative proportion or
disposition of the various parts described in the above specification, or exemplified
in the accompanying drawings, as any or all of them can be considerably varied
without departing from the spirit of my invention.
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
claim is ;-
CLAIMS.
1. The method and means for preventing the downward slipping of tee squares
during use, the said means consisting essentially of two flanged runners having
downward hanging projections one of which can be sprung into contact with the
edge of the drawing board by the action of a spiral spring operating between the
two projections, contact between the runners and the tee square being maintained
by the use of thumb nuts provided above the runners, the whole substantially
as described in the above specification, and exemplified in the accompanying
drawings.
2. In tee squares, the improvements provided for and operating substantially
as described in the above specification, and exemplified in the accompanying
drawings.
Dated this 8th day of December 1896.
HUGHES & YOUNG,
23, Coleman Street, London, E.C., Agents for Applicant.