Improvements in Flooring Cramps.
Year: 1891

page_text: Date of Application, 27th July, 1891
Complete Specification Left, 26th Apr., 1892-Accepted, 25th June, 1892
PROVISIONAL SPECIFICATION.
Improvements in Flooring Cramps.
I, JOHN THOMAS GIBSON of Windsor Road, Kings Lynn, in the County of
Norfolk, Church Plumber, do hereby declare the nature of this invention to
be as follows:-
The base plate of the cramp is grooved on its upper surface to receive two
slides connected by toggle levers to a block which can be moved up and down a
vertical central standard by a screw worked by a handle. On each side below
the base plate is a pair of gripping blocks. These blocks are pivotted eccentrically
to the base plate, the blocks of each pair being connected together by a rod and
one block of each pair being also connected by a rod to the outer end of one of
the slides. The other slide carries at its end a pivotted plate.
The action of the apparatus is as follows:-
The base plate is placed upon the joist and the handle is turned causing the
toggle block to descend, protruding the slides from their grooves, so bringing the
pivotted plate upon one slide against the floor board whilst the movement
of the other slide turns the eccentrically pivotted blocks about their pivots causing
them to grip the joist, thereby preventing the apparatus from moving, so that the
continued movement of the handle causes the first mentioned slide to be further
protruded and so forces the flooring board home into place. When the board has
been secured the handle is turned the other way, releasing the apparatus.
Dated this 25th day of July 1891.
J. T. GIBSON.
COMPLETE SPECIFICATION.
Improvements in Flooring Cramps.
I, JOHN THOMAS GIBSON, of Windsor Road, Kings Lynn, in the County of
Norfolk, Church Plumber, 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 :-
Figure 1 is a side elevation of the cramp, Figure 2 is a plan, and Figure 3 is a
section on the line A. B Figure 2.
g.
The base plate a of the cramp is grooved on its upper surface to receive two
slides connected by toggle levers c to a block d which can be moved up and down
a vertical central standard e by a screw worked by a handle The standard e is
free to slide in the base plate. On each side below the base plate a is a pair of
gripping blocks h. These blocks are pivotted eccentrically at to the base plate,
the blocks of each pair being connected together by a rod j and one block of each
pair being also connected by a rod k to the outer end of one of the slides b. The
other slide carries at its end a pivotted plate l.
The action of the apparatus is as follows:-
The base plate is placed upon the joist and the handle g is turned causing the
toggle block d to descend, protruding the slides 6 from their grooves, so bringing
the pivotted plate upon one slide against the floor board whilst the movement of
the other slide turns the eccentrically pivotted blocks about their pivots h
causing them to grip the joist, thereby preventing the apparatus from moving, so
that the continued movement of the handle causes the first mentioned slide b to be
further protruded and so forces the flooring board home into place. When the
rice Buil

page_text: board has been secured the handle g is turned the other way, releasing the
apparatus.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In flooring cramps the combination of blocks for holding the joint, a pusher
for acting on the board and a handle operating the blocks and the pusher
simultaneously substantially as described.
2. Flooring cramps substantially as described and shown in the drawings.
Dated this 19th day of April 1892
J. T. GIBSON.