A Joiner's Sash Cramp.
Year: 1893

page_text: Date of Application, 12th June, 1893
Complete Specification Left, 22nd July, 1893-Accepted, 2nd Sept., 1893
PROVISIONAL SPECIFICATION.
A Joiner's Sash Cramp.
I, WILLIAM CHARLES CHAPPELL of 18 Pellerin Road, Stoke Newington
London N. Joiner do hereby declare the nature of this invention to be as
follows:-
A pair of double clamps, running on & between parallel bars. One, propelled
by means of a screw tapped through a fixed block at one end of bars, the other
clamp adjustable at convenient intervals by a small screw through its centre
pressing upon a flat bar running the full length & passing through a slot in clamps,
& fixed at ends. The materials used being cast & wrought iron & steel. The
advantage of the invention being that equal pressure is obtained on both sides of
the tennon simultaneously (instead of only one side as usual) with space for driving
the wedges between.
Further, that there being no projection above the sash which is laid on a cramp
at each end renders the process of "squaring" more convenient.
Dated this 12th day of June 1893,
WM. CHAPPELL.
COMPLETE SPECIFICATION.
A Joiner's Sash Cramp.
I WILLIAM CHARLES CHAPPELL, of 18 Pellerin Road, Stoke Newington,
London, N., Joiner, do hereby declare the nature of this invention and in what
mauner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention consists of a pair of clamps with double grips, made preferably
of malleable cast iron or steel castings running upon & between parallel bars of
wrought iron or steel, as shewn in the accompanying drawings. One clamp (A)
propelled by means of a square-threaded male screw, with handle for turning, &
working in a female screw, tapped in or below the centre of block (B) also of cast
iron or steel, & fixed to one end of parallel bars (F). The other clamp (C)
adjustable by means of a loose steel pin (C¹) (with set-screw to prevent falling out)
passing through centre of clamp, & into one of a series of holes drilled at
convenient intervals into a flat bar (E) or when preferable, by ordinary ratchet
movement in lieu of pin & holes fastened under block (B), & passing through or
under both clamps, & also in block (D) which block, being connected to side bars
by a bolt, or screws, may be removable, in order to be attached in a similar manner
to the extreme ends of an additional set of corresponding bars of indefinite length
for ordinary lengthening purposes. The loose ends of both sets of bars to be
connected to each other by means of a projecting flange (G) rivetted on the outside
of side bars, & connected by a stud & winged nut with wing on the outside (H).
The centre flat bar to be connected in a similar manner or by a flat wedge dovetail I.
Thus forming no impediment to the free passage of clamp (C) from one extreme
end of cramp to clamp A.
Having now particularly described and ascertained the nature of my said inven-
tion, & in what manner the same is to be performed, I declare that what I
claim is :-
--
I. In an apparatus of the kind described. The use of a pair of clamps with
double grips operating as described & shewn in the accompanying drawings.

page_text: II. In an apparatus of the kind described the working of the same upon &
between parallel bars as described & shewn in the accompanying drawings.
III. In an apparatus of the kind described. The method of lengthening the
same for ordinary purposes, as described & shewn in the accompanying drawings.
Dated this 22nd day of July 1893.
WILLIAM CHARLES CHAPPELL.