Year: 1899

page_text: I, CHARLES EDWARD BRADBURY, Engineer, Brick House, Crumlin, Mon., do hereby
declare the nature of this invention to be as follows:-
"A" is a box casting of cast steel, gun metal or other suitable material, the ends of
which are bored and tapped to suit the shanks or legs "C."
I use 2 shanks or legs to each jack, one of them screwed with a right hand thread,
and the other with a left hand thread. The end of each shank or leg is turned down
and screwed as shown on sketch and rivetted to the foot piece "B."
In working the box "A" is turned round by means of a rod or bar put thro'
the holes "F"; or by means of a spanner fitting on the hexagonal parts "G." It
will be seen that by turning the box "A" in the right direction, that it will cause
the 2 shanks or legs "C" to move outwards from the centre & so lift the load.
In the same manner, the jack can be used to "thrust" outwards; as, for instance,
to block out the tram rails in & about collieries and the like.
Again, if the 2 shanks or legs "C" be wound out to their full extent, and suitable
pieces be provided to fit the ends of the box & to attach to the piece or pieces to be
operated upon; by reversing the motion of the box "A" the jack can be employed
for pulling purposes, as well as lifting or thrusting.
It will be readily seen from the foregoing, that the jack can be employed in an
equally effective manner to lift, or thrust or to pull; and that the limit of motion
in wards or outwards is governed by length of box "A" and shanks or legs "C."
It will be noticed that this jack differs from all other jacks worked by screws in the
fact that it is the box or casing that turns & not the screws.
Dated this 20th day of December 1899.
CHARLES EDWARD BRADBURY,
Engineer, Brick House, Crumlin, Mon.
CHARLES EDWARD BRADBURY, Engineer, Brick House, Crumlin, Mon., do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement :-
This mechanical device has been designed as a light strong convenient and handy
apparatus for dealing with weights up to about 10 tons.
It is well known that the ordinary screw jack of commerce as used for dealing with
fairly heavy weights is difficult to work & handle in confined spaces owing to its
shape & size, whilst its weight makes it difficult to transport from place to place.
Price 8d1

page_text: Further most screw jacks work from one end only-that is, the screw works in
one end only of the box or casing-and in all instances it is the screw which revolves
when working, whilst the box or casing remains stationary.
In the working of this (jack) my invention these conditions are exactly reversed.
The jack opens out from the centre of the box or casing; it has a foot at each
extremity or end and stands equally well on either of them, and motion is given to
the jack by revolving the box or casing. The screws themselves do not revolve.
Owing to its shape it will work equally well if placed in a horizontal position if
required to push or pull. It will readily be seen by any one engaged in mechanical
pursuits that the jack is practically a universal one, and that by arranging suitable
feet or end pieces to the screws that the jack can be adapted & applied to an end-
less number of jobs in the varied branches of engineering practice, whilst its con-
struction, shape & size make it especially convenient where it is necessary to have a
light strong & portable apparatus for dealing with heavy masses of materials. In
order the more clearly to explain this my invention and in what manner the same is
to be performed I refer to drawing left with Provisional Specification.
"A" is a box or casing-of cast steel. gun metal or other suitable material-bored
and tapped to receive the screwed pieces "C." The screwed pieces "C" are pivotted
at one end to receive the foot or end piece "B" which is rivetted in position.
In working-after placing the jack in position-the box or casing is made to
revolve by means of a suitable bar working in the holes F, or by means of an ordinary
spanner applied to hexagonal part G on either side of collar H."
It will be seen that by causing the box or casing A to revolve in a given direction,
it will cause the screws to move "upwards" or "outwards" from the centre of the
box and in that manner lift or push the material operated upon; and if the motion
be reversed that is, the screws wound out to the required distance and the necessary
attachments made by giving the reverse motion to the box or casing A the
screws "C" can be drawn in towards the centre & so act as a straining or pulling
screw.
Motion, in either direction, can be given to the box or casing A by a rod working
in the holes F; by an ordinary spanner working on the hexagonal portion of the box;
or by a lever with a ratchet & pawl attachment. The amount of motion in lifting
pushing or pulling is governed by the length of the box or casing A & the lengths
of the screwed pieces "C."
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
"The revolving box or casing and the screwed pieces or legs working in combina-
tion and applied to screw jacks for lifting pushing or pulling" substantially as herein-
before described and shown in the drawing left with Provisional Specification.
Dated this 14th day of February 1500.
CHAS. E BRADBURY,
Brick House, Crumlin, Mon.
Dated this 14 May of February 1900
CHAS. E BRADBURY,
Brick House, Crumlin, Mon.