IMPROVEMENTS IN CRAMPS
Year: 1878

page_text: LETTERS PATENT to Henry Charles Tucker, of Peterborough, in the County
of Northampton, Surveyor, for the Invention of "IMPROVEMENTS IN CRAMPS."
PROVISIONAL SPECIFICATION left by the said Henry Charles Tucker at the
Office of the Commissioners of Patents on the 31st December 1878.
HENRY CHARLES TUCKER, of Peterborough, in the County of Northampton,
Surveyor. "IMPROVEMENTS IN CRAMPS."
The Invention consists of a bar or beam made so as to be separate from the head
or screw end, and constructed to fix with screws to the head or screw end, which
will admit of its being removed and a longer bar screwed in its place. The head or
scrow end is so constructed as to clip a floor joist or anything similar, and to admit
of the beam or bar being screwed to it. On the head above mentioned is a screw
which revolves on a spindle fixed on the head in two distinct ways, for convenience
to work it as a floor cramp or joiner's cramp. The cheek or jaw is made so as to
slide on the bar or beam, and fixes or fastens itself on any part of the bar without
the aid of any wheels or other moveable parts to assist it. In one end of the jaw is
a hole for the purpose of fitting a plate or table for the use of drilling, to which it
can be applied. The various parts may be made of metal and wood combined.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Charles Tucker in the Great Seal Patent Office on the 30th
June 1879.
HENRY CHARLES TUCKER, of Peterboro, in the County of Northampton.
"IMPROVEMENTS IN CRAMPS."
The improved cramp, which I call "the universal cramp," consists of a bar or
beam, which may have any convenient section, and is made as a separate piece from
the head or screw end, and attached to the latter by means of screws, so that, if
necessary, a short bar may be exchanged for a longer one, or vice-versa; a head or
screw end constructed so as to clip a floor joist or anything similar, and to admit of
the bar being screwed to it, and made capable of carrying the screw spindle with its
socket in two or more different ways, in order to use the tool at will either as a
floor cramp or as a joiner's cramp; a cheek or jaw made so as to slide on the bar or
beam, and to fix or fasten itself at any convenient part of the latter without the aid
of any wheels, pins, rollers, wedges, or springs, said jaw being provided, if desired,
with a hole or holes for the purpose of fitting the table of a drilling machine or
other tool, a screw spindle and socket, capable of being attached to the head in
different ways, preferably by means of a pin going through one of two holes with
which the head is provided. The nature of the Invention and the mode of manu-
facture will be more clearly understood by referring to the accompanying Drawings,
which illustrate some practical forms of it, Figure being an elevation, and Figure 2
a plan of the tool used as a floor cramp; Figure 3, an elevation of the tool used as a
joiner's cramp; Figure 4 an elevation of the cramp as applied for drilling purposes;
Figure 5 a jaw for an ordinary bench cramp; and Figure 6 a twin jaw for a floor
cramp, both jaws adapted for a flat bar; while Figure 7 shews a jaw adapted for a
T bar. A, A¹, is the bar attached to the head B by a dove-tail joint and screws.
The head B is provided with a toothed arm b and two holes b, and b₁, which admit
of the screw-socket C being fixed with its pin c in different ways, one way when
the tail is used as a floor cramp, and another way when the tool is used as a
joiner's cramp. D is the screw spindle with the face plate d and the handle d'.
E, E¹, E, E³, is the sliding jaw formed so as to slide easily and to fix itself at any
place on the bar by friction, as soon as pressure is applied. The face plate e, e₁, eq, C,
of the jaw may be placed in the centre, as in Figure 5 and 7, on both sides, as
in Figure 6, or on one side only (Fig. 2 and 4), according to the purpose for
which the tool is used.
In witness whereof, I, the said Henry Charles Tucker, have hereunto set my
hand and seal, this Twenty sixth day of June. A.D. 1879.
HENRY CHARLES TUCKER. (L.S.)