Improvements in Folding Squares.
Year: 1893

page_text: Date of Application, 30th June, 1893-Accepted, 14th Oct., 1893
COMPLETE SPECIFICATION.
Improvements in Folding Squares.
I, ELIPHALET DE CAMP, of 282 Halsey Street, Newark, County of Essex and
State of New Jersey, U.S.A., Contractor, 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 :-
This invention relates to new and useful improvements in folding squares, and
has for its object such a construction of folding squares, that the arms .connected
together, when opened, shall present a perfectly flat surface without any portion of
the hinge projecting above said surface. The invention consists in the improved
folding square and in the combination and arrangement of parts hereinafter more
fully described and claimed.
and
Referring to the accompanying drawings,
Figure 1 represents a plan view of the folding square ;
Figure 2 is an end view of Figure 1 when the square has been folded together,
Figure 3 is a sectional view on the line of Figure 1.
.C
In said drawings a and b represent the arms of the square provided with mitred
ends d. Said ends are pivotally joined together by hinge c countersunk into the
arms a and b, so that the surfaces of said plates c are flush with the surfaces of the
arms a and b when the square is opened. The ends of said hinge plates c are
rounded as clearly shown in Figure 3 of the drawing.
The thickness of said hinge plates e corresponds to the thickness of the square.
Passing parallel to the mitre line d of the square and through perforations in the
ends of hinge plates c and the arms a and b are the pins or pintles i, adapted with
the hinge plates c to hinge the arms a and b together.
The arms a and b are provided with an inwardly bevelled groove h in which is
adapted to slide a locking bolt g, the upper surface of which is also flush with the
surface of the square.
Said bolt 9 is adapted to engage, when the square is opened, the groove h on
both sides of the mitre lines d and to lock said arms in that position.
By preference the length of the groove is one half longer than the length of
the locking bolt g, and that portion of the groove which is formed in the surface
of one of the arms a or 6 is at least the same length as that of said locking bolt.
By using the above described construction the square may be folded on either
side and when opened, there will be no projections on either surface.
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:
1. In a folding square a hinge consisting of two or more independent hinge
plates having perforated ends, in combination with two pintles each passing through
the perforated ends of the hinge plates and through the parts to be hinged together,
said hinge plates extending into the substance of the hinged plates, substantially as
described.
2. In a folding square a hinge consisting of two or more independent plates
having perforated ends in combination with two pintles passing through the
perforations in said plates and the parts to be hinged together, said hinge plates
being let into the parts to be hinged so that their surfaces are in the same plane,
ubstantially as described.
3. A folding square consisting of the arms a and b united at their mitred ends
by hinge plates c, set in said arms and extending on either side of the mitre line,

page_text: the surfaces of the hinge plates and of the arms being in the same plane, and with
two pintles passing through said arms beneath their surface and parallel to the
mitre line, and through the ends of said hinge plates substantially as described.
4. A square consisting of two arms mitred at their adjoining ends and hinged
together at said mitred ends, and a locking mechanism adapted to hold said arms
rigid in normal position, substantially as described and for the purposes set forth.
5. In a square the combination with the two arms mitred at their adjoining ends,
and provided with grooves approximately at right angles to said mitred joint, of
hinges arranged in said mitred joint, and a locking bolt arranged in said groove, all
said parts, substantially as described and for the purposes set forth.
Dated this 20th day of Iun 1804
J. P. BAYLY,
18, Fulham Place, W., Agent for the Applicant.
J. P. BAYLY,
18, Fulham Place, W., Agent for the Applicant.