An Improved Cramp for Picture Frames and other like work.
Year: 1890

page_text: Date of Application, 27th Nov., 1890
Complete Specification Left, 24th Sept., 1891-Accepted, 14th Nov., 1891
PROVISIONAL SPECIFICATION.
An Improved Cramp for Picture Frames and other like work.
We, JOHN ARTHUR BROOKFIELD, and ARTHUR EDWARD WHITEHEAD, both
of Change Alley, Sheffield, in the County of York, Merchants and Manufacturers
do hereby declare the nature of this invention to be as follows:-
_
Our invention has for its object to construct a cramp to hold firmly the angles or
corners of a picture frame or other analogous piece of work, so as to retain it in
position whilst nailing or otherwise securing the parts together, and to enable the
separate parts of such frames or other subjects to be more expeditiously put
together.
To carry out the invention in its most convenient form we propose to construct a
cramp having two chief parts pivotted to each other in the centre, so that they can
be turned on their common centre and be closed together, or opened out in the
form of a cross, having four arms radiating from a centre.
Each arm has a central longitudinal opening or slot and a traversing screw with
projecting end, prepared to receive a screw key or equivalent means for turning it.
On the face of each arm and engaging with the screw is a sliding jaw of a form
suitable for gripping both sides of a corner and so arranged that when a square or
oblong frame is placed upon the jaw plate within the jaws, and the screws are
turned, the corners of the frame will be cramped together and the frame securely
held for nailing or otherwise fastening.
If desirable we may connect all the traversing screws at the centre by means of
a central bevil wheel and pinions, so that when the wheel is turned, the pinions
cause the screws to revolve and the jaws to travel simultaneously-a clutch may
also be added to throw the wheel out of gear when it is required to work the jaws
separately.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.
COMPLETE SPECIFICATION.
An Improved Cramp for Picture Frames and other like work.
We, JOHN ARTHUR BROOKFIELD, and ARTHUR EDWARD WHITEHEAD, both
of Change Alley, Sheffield, in the County of York, Merchants and Manufacturers
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 :-
Our invention has for its object, the construction of a cramp that can be readily
adjusted to fit the angles or corners of different sizes and shapes of picture frames,
and other like rectangular frames, or pieces of woodwork, so as to cramp the same
together and hold it in position for glueing, nailing, or otherwise fastening the
parts together, and thus to enable, the separate portions of such frames, or other
like work to be expeditiously and quickly put together.
To enable our invention to be clearly understood we have illustrated a cramp
made according to our invention, in the annexed sheet of drawings.
In carrying out our invention in its most convenient form, as shown in the
drawings, the cramp is constructed of metal or other suitable material and in two
chief parts, which are pivotted together in their centres, in such a manner that the
said two parts may be folded together when the cramp is not in use, or opened out
D

page_text: in a cruciform position, in which the four arms A, would appear radiating from the
centre pin C.
Each arm has a central longitudinal opening L O, in which a regulating and
cramping screw S, is fixed, one end of which projects through the end of arm A,
in the form of a squared head H, by which the said screw may be conveniently
turned with a spanner, handle, or key K.
On the face of each arm is a sliding jaw J, firmly fixed upon a travelling nut
(through which the screw passes) but free to swivel in any direction on a hori-
zontal plane; each jaw can be traversed to any point upon the arm by rotating the
screw as before described.
The sliding and swivelling jaws J, are of a suitable form for receiving and
gripping both sides of the rectangular corners of a frame, as indicated by the
dotted lines F, or other work, whether of square or of oblong form, the cramp
being adjusted by opening or closing the arms, and by closing or expanding the
sliding jaws as the case may be. The arms may be secured in any position by
means of the thumb nut N.
As will be understood, the cramping grip is given by so turning the screws that
the jaws move towards the centre, C.
The adjusting screws S, may if desirable be all connected by means of pinions
fixed upon their inner ends and geared into a central wheel, so that when the
wheel is turned it will cause all the screws to revolve, and the jaws to travel
simultaneously; if the jaws are required to move separately, the wheel is drawn
out of gear with the pinions, and the screws turned by the key K.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same may be performed, we declare that what we
claim is
A cramp of cruciform construction, consisting of two chief parts pivotted
together at their centres, and thus forming four arms, each provided with a screw,
and travelling jaw, capable of being traversed to and from the centre of the cramp,
substantially as hereinbefore described and illustrated.
Dated the 21st day of September 1891.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.