A New and Improved Hinge.
Year: 1890

page_text: COMPLETE SPECIFICATION.
A New and Improved Hinge.
A communication from CHARLES WILLIAM DUNBAR, of 1146, Yonge Street, in the
City of Toronto, in the County of York, in the Province of Ontario, Canada,
Mechanic,
I, ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E., 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:-
The object of the invention is to design a hinge by which a door, watch-cover, or
other part usually connected in position by a hinge, may be attached by a suitable
hinge which is invisible when the door, watch-cover or other part is closed; and it
consists, essentially, of a curved lip attached to a door, watch-cover, or other part
and designed to fit into a correspondingly-curved recess formed in the door-jamb, watch-
centre, or other corresponding part, when the door, watch-cover, or other part is closed
upon the part to which it is hinged.
Figures 1 and 2 show alternative forms of this improved hinge applied to a watch-
case.
Figure 3 is an outside view of a watch-case provided with the improved invisible
hinge.
Fig. 4 is a view of the improved hinge applied to a door half open.
Fig. 5 is a view of similar parts, showing the door fully open.
Fig. 6 is a sectional top view, through the hinge of a door closed.
In the drawings, like letters of reference indicate corresponding parts in the
different figures, but for the purpose of this specification I propose to refer separately
to the figures which represent the adaptation of this improved invisible hinge to
different purposes.
In fig. 1, I show a simple application of the device to a watch-case. In this
figure the lip A is a broad plate attached to the watch case cover, B, and curved to fit
into a curved recess or pocket C formed in or attached to the watch-centre D.
In fig. 2 the lip A is merely a curved wire designed to fit into a curved tube
forming a recess Cand attached to or formed within the watch-centre, D, as represented.
I prefer to use two wires as shown in this figure. In both forms the hinge is
perfectly invisible when the cover is closed as shown in fig. 3.
In figs. 4, 5, and 6 the lip A is a curved extension of the plate, E, sunk into the
edge of the door B which in these figures corresponds with the cover B shown in
figs. 1, 2 and 3. This curved lip A fits into a curved recess C made in the door-
jamb D which corresponds with the watch-centre shown in figs. 1, 2, and 3.
When I employ this hinge for a door, or use it in any other application where it
is necessary that the hinge should be fully opened, and where it is not convenient to
form the curved lip into a complete half circle, I use a plate or plates F pivoted to
the door or corresponding part and having its opposite end shaped to hook below
slides, G, which I sink into the jamb, as indicated, so that it shall be below the face
of the said jamb. This hinged plate has a notch a cut in its edge in such a
position that when the door is fully open the said notch will fit over onto the projec-
tion 6 which extends from the face of the slide G as indicated and thus form a lock to
hold the door to its jamb.
I only use the plate F for the purpose of holding the parts together when the
curved lip A has been opened up out of its socket, but the plate is not necessary when
the cover or door is not required to open fully, as indicated in figs. 1 and 2; or by
making the curved lip A on a full half circle and providing means for preventing it
coming entirely out of the recess, the plate F need not be used.

page_text: In fig. 1 I show a set-screw, d, screwed into the recess and designed to project
through an oblong hole made in the lip A. This will allow the lip to move freely in
its recess without permitting it to be entirely withdrawn.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :-
1. The combination with two parts to be hinged together, of a curved lip attached
to one part and designed to fit into a curved recess made in the other part, sub-
stantially as and for the purpose specified.
2. The combination with two parts to be hinged together of a curved lip fixed to
one part and designed to fit into a curved recess formed in the other part, means for
preventing the withdrawal of the curved lip being provided, substantially as and for
the purpose specified.
Dated this 13th day of February 1800
W. P. THOMPSON & BOULT,
Agents for the Applicant.