A New or Improved Folding Picture Canvas Frame.
Year: 1891

page_text: Date of Application, 7th Mar., 1891
Complete Specification Left, 24th Nov., 1891-Accepted, 24th Dec., 1891
PROVISIONAL SPECIFICATION.
A New or Improved Folding Picture Canvas Frame.
I, EDWARD RICHARD BUTLER, of Überlingen on the Lake of Constance,
in the Empire of Germany, Artist, do hereby declare the nature of my invention
to be as follows:-
The object of this invention is to provide a frame for artists canvas, so
constructed that when open the canvas is tightly stretched upon the frame with
flat surface, and when closed the canvas at the fold is protected from being bent or
crushed and is held in a suitable curve while the frame is folded in half and secured
with its two opposite ends in contact.
The frame is constructed in two corresponding halves connected together at their
line of junction by two bars or strips placed across the line of juncture on the edges
of the frame and each pivoted at two points respectively to the one and other half
of the frame so that when the latter are folded together the said bars or strips hold
them apart from each other and the canvas at and near the junction line of the
frame lies in the form of a curve. The outer side edges of the frame meeting
together by folding the frame are secured by a clamp or strap. To prevent the
two halves of the frame from falling flat upon one another the strips or bars are
provided with ears meeting against stop pins on the frame, or with pins moving in
quadrant slots in the frame so that amplitude of movement of each hinge joint is
limited. A locking catch or bolt is provided for locking the halves of the frame in
their open position.
The halves may also be connected by a double hinge formed of a U-shaped plate
as a centre piece of said hinge and two side plates pivoted to the respective ends of
this plate and intended to be attached to the respective halves of the frame.
Dated this 7th day of March 1891.
HERBERT & Co.,
Agents for the Applicant.
COMPLETE
SPECIFICATION.
A New or Improved Folding Picture Canvas Frame.
I, EDWARD RICHARD BUTLER, of Überlingen on the Lake of Constance, in
the Empire of Germany, Artist, 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 this invention is to provide a frame for artists canvas so constructed
that when open the canvas is tightly stretched upon the frame with flat surface, and
when closed the canvas at the fold is protected from being bent or crushed and is
held in a suitable curve while the frame is folded in half and secured with its two
opposite ends in contact. The frame is constructed in two corresponding halves
connected together at their line of junction by two bars or strips placed across the
line of juncture on the edges of the frame and each pivoted at two points respec-
tively to the one and other half of the frame so that when the latter are folded
together the said bars or strips hold them apart from each other and the canvas at
and near the junction line of the frame lies in the form of a curve. The outer side
edges of the frame meeting together by folding the frame are secured by a clamp
or strap. To prevent the two halves of the frame from falling flat upon one
another the strips or bars are provided with ears meeting against stop pins on the
frame, or with pins moving in quadrant slots in the frame so that amplitude of
Price dl

page_text: movement of each hinge joint is limited. A locking catch or bolt is provided for
locking the halves of the frame in their open position.
A spring may also be used for this purpose, this spring also holding the two parts
of the frame apart when folded together.
The halves may also be connected by a double hinge formed of a U-shaped plate
as a centre piece of said hinge and two side plates pivoted to the respective ends of
this plate and intended to be attached to the respective halves of the frame.
In the accompanying drawings
Fig. 1 is a rear view of the frame open.
Fig. 2 is a side view of the same closed.
Fig. 3 shows a modification.
Fig. 4 a further modification in the hinging.
Figs. 5, 6 and 7 show the modification in which the hinge is fitted with a spring.
a a are the two frame parts on which the canvas is stretched. These two parts
carry the plates e e e e to which the bars bb are pivoted as described, the plates e
may have the slots d in which the pins c on the bars engage to limit the pivotal
movement of the bar on each frame, or the plates may have lugs (Fig. 3) acting
as stops against shoulders on the bars b for the same purpose.
9
When the frame is
opened the bars g pivoted at fare moved across the back of the frame and secured
under the heads of the screws h. When the frame is closed it may be secured by
the strap loop i on the screw head k or by a clamp such as is shown in Fig. 3
formed of a hook na sliding tongue o, a butterfly nut p and a safety loop taking
into a hole in the shank of the hook n.
In Fig. 4 the side bars are replaced by the double hinge formed as before
described with the centre piece.
In Figs. 5, 6 and 7 the flat spring is fixed onto the two parts of the frame a
so that it tends to open the frame and keep same open. When the frame is folded
it assumes a curve as in Fig. 5 within which the canvas rests. Here the butt
pivoting of the bars b is not required so that the plates may be dispensed with
and the bars may be fastened direct by pivotal screws onto the wood of the
frames a a.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:―
A folding frame for holding picture canvas in which the parts of the frame when
folded are held apart by devices such as are herein described and the canvas is
thereby prevented from being crushed at the fold of the frame as set forth.
Dated this 24th day of November 1891.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents for the Applicant.