Mitre Cramp.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Mitre Cramp.
WILLIAM METHERELL, 58 Tennyson Road Stratford London E. Joiner, do
hereby declare the nature of this invention to be as follows:-
This invention relates to mitre cramps consisting of four castings with flanges
to clip the corners, to which a small pulley is attached. There are two blocks one
to connect cord around pulleys and the other which is oblong shape is to secure
and fasten the cord at one end with a knot the other with a black-wall hitch.
There is a screw tapped through the oblong block, which when tightened secures
the corners firmly. This has the effect of applying the tension upon each corner
in the manner required..
This invention relates to the manner in which I construct and arrange cramps
for use upon picture. frames, flaps, trays or other similar articles in the which
mitre corners are employed whereby I am enabled to cramp firmly together four
corners or mitres at one setting of my improved appliance.
In carrying out my invention I prefer to proceed as follows;
For each corner is provided a cramp preferable of cast iron with suitable
flanges or projections for securing the adjacent pieces of timber or other material
required to be mitred.
The flanges or projections being arranged at the corners in a manner to permit
access to the corner or the timber edge. At the opposite end of the castings, I
arrange a small pulley attached by a screw or rivet in the casting.
The corner pieces are placed at the back of mitred frame connected by a cord
or equivalent around each pulley secured at one end of the oblong block and
fastened at the other end by a black-wall hitch, being quick & simple then
tightened by the screw.
This has the effect of applying the strain upon all four corners in the manner
required.
Dated this 20th day of Julv 1895.
WILLIAM METHERELL 58 Tennyson Road Stratford Essex Joiner 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 the manner in which I construct and arrange cramps
for the use upon picture frames, flaps, trays or other similar articles in which
mitred corners are employed, whereby I am euabled to cramp firmly together
four corners or mitres at one setting of my improved appliance, thereby making
better work and saving time than that of the ordeniary method viz. each corner
separately.

page_text: In the accompanying sheets of explanatory drawings,
Figure 1. shows the plan of a corner clamp with suitable flanges or projections
for securing the adjacent pieces of timber or other material required to be
mitred.
Figure 2. shows an elevation of the corner clamp with a small pulley attached
through which a round headed screw is inserted and tapped into the casting.
Figure 3 shows the plan of the block for connecting the cord or other material
in which are centred two small pulleys.
Figure 4. shows an elevation of the same.
Figure 5. shows an oblong block with a screw tapped in the same in order to
apply the tension.
Figure 6. shows the cramp applied to a frame.
Figure 7 shows an elevation of the corner clamp with the pulley and screw
reversed in order to apply the cramp on any plane surface such as a flap and
the like.
Figure 8 shows the plan. of a casting to be used on the extreme point of the
mitred corners, particularly of very small mouldings.
Figure 9. shows the elevation of the same.
.
In carrying out my invention I prefer to procede as follows.
For each corner is provided a clamp as illustrated in the accompanying drawings
(preferable of cast iron or other metal) with suitable flanges or projections for
securing the adjacent pieces of material required to be mitred.
The flanges or projections are arranged in a manner to permit access to the corners
of the mitred timber edges for nailing screwing and the like.
At the opposite end of each casting I arrange a small pulley through which a
round-headed screw is inserted and tapped into the casting. The thread of the
screw is cut only one quarter of an inch on the point which is just the thickness
of the casting and therefore forms an abutment or shoulder in its self allowing the
pulley to turn freely without being tightened.
Figure 3 is an illustration of the block for connecting the cord or other
material in which two small pulleys are centred, it can be made of wood or iron
and has a hole bored in the top a little distance in order to take the pin of the
screw as illustrated in Figure 5 and to keep the block in position.
Figure shows an oblong block which also can be made of wood or iron
through which a screw is tapped and on which the ends of the cord or other
material is fastened, at one end it is passed through the hole and a knot tied, and
passing through the pulley of the block as illustrated in Figure 3. and over the
pulleys of each casting back through the other pulley of the same block, and
fastened by a simple hitch which tightens its self as the tension is increased.
The manner of procedure is as follows the material is placed in the clamps
either the right or back side up which are connected by a cord or other material
around each pulley of the castings or clamps passing through the connecting
block Figure 3 hereinbefore described and illustrated in the accompanying
drawings and secured at one end of the oblong block in Figure 5 of the
accompanying drawings and fastened with a simple hitch at the other end which
tightens its self as the tension is applied.
The screw when tightened forces one block away from the other thus tightening
the cord at the same time around each clamp simultaneously. This has the effect
of applying the tension upon all four corners at the same time in the manner
required.
When once the cord has been strung through the block in Figure 3. as
illustrated in the accompanying drawings it is always ready for use and it only
has to be placed over the pulleys of the clamps and the screw tightened which
secures almost an instantaneous grip.
The clamp in Figure 7 is only to be used on a plane surface such as flaps, trays,
and the like.

page_text: The clamp in Figures 8 and 9 is to be used on frames with very small mouldings
to grip the extreme points only.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
1. A frame fastening device, the combination with corner clamp as in
Figures 1-2. 8 and 9. of the accompanying drawings, of a screw and block as
in Figure 5 for tightening the cord or other material. A block with pulleys
inserted as in Figure 3 for connecting the clamps by the cord or other material
as in Figure 6 tightened by the said screw and means such as described in the
accompanying drawings.
2. A frame fastening device and clamp to clip the extreme points as in
Figures 8 and 9 of the accompanying drawings.
3. The combination and arrangement of parts constituting the complete frame
fastening device as herein before described and illustrated in the accompanying
drawings.
Dated this 18th day of April 1896.
WILLIAM METHERELL.