Owner Frames.
Year: 1886

page_text: Owner Frames.
I ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
Engineer do hereby declare the nature of this invention (a communication from
William Cutts of the City of Toronto, in the County of York in the Province
of Ontario Canada Artist) 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 an efficient fastener for frame joints
more applicable to what are known as "Artists Canvas Stretchers" and it consists
essentially of a plate pivoted on one side of the joint and having a curved slot
eccentric to its pivot formed in the plate and designed to receive a headed pin or
screw fixed into the portion of the frame on the opposite side of the joint from
which the plate is pivoted the centres between the screws for holding each plate
being on a line substantially at right angles to the joint, and the slot being on a
line eccentric to the pivot point of the plate so that the two parts of the frame on
opposite sides of the joint shall be moved either towards or farther apart from each
other when the said plate is turned on its pivot, substantially as hereinafter more
particularly explained.
Figure 1 is a plan of a frame having a centre bar and provided with this improved
fastener.
Figure 2 is a detail of a corner of the frame showing the joint expanded.
Figure 3 is a detail of the centre-bar joint expanded.
A represents the joint plate shaped substantially as shown and pivoted at a.
A curved slot b is made in the plate A eccentric to its pivot a through which slot
the headed pin or screw c passes which pin or screw is inserted into the portion of
the frame opposite to the pivot a the two screws being on a line substantially at
right angles to the joint d consequently as the slot b is eccentric from the pivot a
the turning of the plate upon its pivot must necessarily either expand or con-
tract the joint-that is to say if the plate is moved in the direction indicated by

page_text: arrow the joint d is expanded as shown in Figures 2 and 3 but if moved in the
direction indicated by the double-headed arrow the joint d is closed as shown in
Figure 1.
From this description it will be seen that this improved fastener for frame joints
enables an artist to make an extremely light canvas stretcher and as no tongue
and groove or other form of joint difficult to make is necessary an unskilled person
is able to make a suitable canvas stretcher by the adoption of this fastener.
In the case of large picture frames in which the joints are glued together this
fastener may be employed for maintaining the joint by contracting the two parts,
as indicated.
I speak of the screw, c, as a headed pin or screw. I refer to the head because it
is essential that a head should be formed on the pin or screw which passes through
the slot, b, in order that the plate, A, may be held with sufficient force against the
frame to prevent it turning on its pivot when set.
When a centre-bar, B, is used, its ends are let into the sides of the frame.
With the view of enabling the pin or screw, c, to be inserted in or taken out of
the slot, b, without being removed from its position I form an enlargement, e, at
one end of the slot, b, sufficiently large to permit the head of the pin or screw, c, to
pass through in order that the shank of the pin or screw, c, may enter the slot, b.
Having now particularly described and ascertained the nature of the said
invention as communicated to me by my foreign correspondent and in what
manner the same is to be performed I declare that what I claim is,
1. A plate A such as pivotted at a on one side of the joint of the frame and
having a curved slot b made in it eccentric to its pivot a in combination with a
beaded pin or screw c located as described and fitting into the curved slot b sub-
stantially as and for the purpose specified.
2. A plate A such as pivotted at a on one side of the joint of the frame and
having a curved slot 6 made in it eccentric to this pivot a and an enlargement e at
one end of the slot in combination with a headed pin or screw c located as
described and fitting into the curved slot b substantially as and for the purpose
specified.
D
01
1
1000