Improvements in Oramps for use in Making Picture Frames.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Oramps for use in Making Picture Frames.
I, WILLIAM RICHARDSON CHAPMAN, of 11, Simpson Street, Newcastle-on-Tyne,
Photographer, do hereby declare the nature of this invention to be as follows:-
This invention for improvements in cramps for use in making picture frames had
for its object an improved construction whereby the sides are tightly pressed together
at the corners, the pressure being applied both on the outside and the inside.
According to this invention, a base plate is constructed to an angle of 90 degrees
and is provided with projections on its outer edges and with a corner piece against
which the sides of the frame when fitted together are caused to bear. A slot is made
in the base plate extending from the corner piece inwards for a suitable distance at an
angle of 45 degrees with the sides and within this slot a screwed rod passes having at
its inner end the movable cramping portion attached and at the corner being fitted
with a wing or butterfly nut by which the cramping portion can be moved backwards
or forwards. The said cramping portion is provided at each side with small gripping
jaws. These gripping jaws are pivoted and pressed outwards slightly by means of
springs.
In use, the sides of the frame are placed upon the base plate with their ends
fitted together. The cramping portion is then drawn up by means of the wing or
butterfly nut and the gripping jaws engage with the sides of the frame giving way
inwards slightly and so coming into a smaller angle carrying the sides of the frame
with them and pressing them tightly together and against the projections on the
base plate.
Improvements in Cramps for use in Making Picture Frames.
I, WILLIAM RICHARDSON CHAPMAN, of 11, Simpson Street, Newcastle-on-Tyne,
Photographer, do hereby declare the nature of this invention, and in what
manner the same is to be performed, to be particularly desorbed and ascertained
in and by the following statement :-
This invention for improvements in cramps for use in making picture frames has
for its object an improved construction whereby the sides are tightly pressed together
at the corners, the pressure being applied both on the outside and the inside.
According to this invention, a base plate is constructed to an angle of 90 degrees
and is provided with projections on its outer edges and with a corner piece against

page_text: which the sides of the frame when fitted together are caused to bear. A slot is made
in the base plate extending from the corner piece inwards for a suitable distance at
an angle of 45 degrees with the sides and within this slot a screwed rod passes having
at its inner end the movable cramping portion attached and at the corner being
fitted with a wing or butterfly nut by which the cramping portion can be moved
backwards or forwards. The said cramping portion is provided at each side with
small gripping jaws. These gripping jaws are pivoted and pressed outwards slightly
by means of springs.
And in order that this invention may be more clearly understood reference is bad
to the accompanying sheet of illustrative drawings on which Fig. 1 is a sectional
elevation of a cramp constructed according to this invention and Fig. 2 18 a plan of
the same.
The base plate A is provided with projections a¹ a¹ and a corner piece a so con-
structed that when the portions of the frame are placed in position they are at an
angle of 90 degrees A slot a² 18 made in the base plate A at an angle of 45 degrees
with the sides and within the slot a screwed rod B passes having at its inner end the
movable cramping portion C attached and at its outer end being fitted with a wing
or butterfly nut D. By actuating this-nut D the screwed rod B can be traversed to
vary the position of the cramping portion C.
The cramping portion C is provided at each side with gripping jaws c o pivoted
at cc. The springs ce tend to press the jaws c c outwards slightly.
In using the appliance the sides of the picture frame are placed upon the base
plate A with their ends fitted together, as indicated by dotted lines in Fig. 2 The
cramping portiou C is then drawn up by means of the nut D and the gripping
jaws c cengage with the sides of the frame giving way inwards slightly, and so coming
into a smaller angle and carrying the sides of the frame with them. The sides of the
frame are therefore pressed tightly together and against the projections a¹ a¹ upon
the base plate A until a joint is made.
By means of this device, the sides of the frame are not only held in position but
as the cramping portion is screwed up they are pressed inwards towards the joint.
Moreover, the nut D is outside the corner a which is a more convenient position than
if at the other end of the screwed rod as it is sometimes placed in devices at present
in use of this class.
A cap or other device may be fitted at the end of the screwed rod B to prevent
entire removal of the nut D if desired.
The base plate can be cast in one piece.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
olaim 18:-
(1) In a cramp for use in making picture frames, gripping jaws upon the cramping
portion capable of giving way inwards slightly thus pressing the sides of the frame
more tightly together at the corner, substantially as described.
(2) In a cramp for use in making picture frames base plate A having pro-
jections at a¹ and corner piece a, screwed rod B arranged to work in slot a³ in base
plate A, cramping portion C having gripping jaws cc pivoted at o³ cand pressed
outwardly slightly by springs 02 08 and wing or butterfly nut D all arranged and
operating substantially as described with reference to the drawings.
Dated this 10th day of April 1899.
GEO H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.