Year: 1890

page_text: Date of Application, 12th Apr., 1890-Accepted, 17th May,
1890
Figure 4 is an end view, and
Figure 5 a detail of the hand lever.
The lifting lever R to be applied to the weight which is to be raised, for example a
railway rail, has its fulcrum in the frame at C. The frame is made of sheet steel
provided with openings. At its outer periphery which is approximately concentric
with the fulcrum C the said frame has a number of notches wherein the hand lever F
is placed.
The rear arm of the lifting lever R is forked and carries at its end a roller r upon
which acts the eccentric cam of the hand lever F. This carries a cross-piece t which
is placed eccentrically to the cam and can be placed below the hooks formed by the
notches in the frame, whilst the cam itself bears upon the roller r so that by means of
the hand lever and its eccentric cam acting upon the roller of the lifting lever the
rail or the like can be lifted.
For locking the lifting lever a wedge c is adapted to slide in a curved slit or
incision formed in the frame, so that in the movement of the hand-lever F it can
slide down between the frame and a bent locking arm pivoted at y, which arm is
carried upwards by the fork of the lifting lever R and bears upon a tongue y placed
concentrically with the aforesaid locking arm, this tongue being fixed in the fork of
the lifting lever and arranged to turn upon its bolt.
=
The wedge c effects its locking action in such a manner that after the weight has
been lifted a certain distance the hand lever F will be liberated, and that, by the
pressure exerted by the tongue q of the lifting lever R upon the arm placed eccen-
trically to the fulcrum C, the wedge c is clamped between this arm and the frame, so
that the weight is under any circumstances kept at the height to which it has been
raised.
When the weight is to be raised further the pint of the hand lever F is placed in
a notch below the same and this is repeated until the weight has been lifted to the
desired height.
After the weight has been lifted the apparatus is liberated by placing the upper
forked end of the hand-lever F (Figure 5) between the wedge c and the lifting

page_text: lever R and then forcing the same upwards. In this manner the apparatus is set free
without shifting the weight from its position.
At the front part of the frame and on the bottom thereof is arranged a plate a of
any suitable dimensions for the purpose of preventing the apparatus from penetrating
too deep into the ground.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
A lifting jack or apparatus, characterized by a lifting lever R being supported in
a frame, the free end of the said lever which is provided with a roller, being acted
upon by the eccentric can of a hand lever F placed in different notches in the frame
according to the height to which the weight is to be lifted whilst in the slit of the
frame slides a wedge c which keeps the weight raised by passing between the frame
and a bent locking arm adapted to turn on the latter and arranged eccentrically to
the fulcrum of the lifting lever, the wedge preventing the back movement of the
said arm z and, by means of the tongue q, that of the lifting lever.
Duted this 10th day of Anril 1890
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.