Improvements in Lever Lifting Jacks.
Year: 1895

page_text: Date of Application, 27th July, 1895-Accepted, 13th June, 1996
COMPLETE SPECIFICATION.
Improvements in Lever Lifting Jacks.
I, OTTO WALTER, Engineer of 14 Dagobertstrasse, Cologne, in the Province of
Rhineland and Kingdom of Prussia, 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 :-
The levers up to the present in use for the raising of heavy loads are provided
at the lower end with a shoe, consisting in the simplest manner of two iron arms,
which unite in the front to a point slightly bent upwards. This shoe does not in
any way offer any security against slipping, and in consequence of this it happens
very often and especially in the building of bridges, railways and other erections,
in which on account of the very heavy loads to be raised, the levers are of great
length and weight, that they slip away, which very easily causes severe injuries to
the workmen standing at its lower end, unless they jump aside at the right time.
It is therefore necessary to provide the lever with a guard, which will make it
absolutely impossible for it to slip off, and such a guard is the subject of my
invention, which is now to be described and explained by the help of drawings.
The lever can of course be used for all kinds of work; in the annexed drawing
I have selected its use in the building of a railway track.
Figure of the drawing shows in a longitudinal section the lower part of the
lever with the shoe at the moment in which a rail is to be raised by means of it;
in the same figure the lever is drawn with dotted lines in a raised position ;
Figure 2 shows the lever and shoe in section xx; in the Figures 3, 4 and 5 the
application of my lever is shown, when employed on various railway materials, and
Figure 6 is a diagram of the lengths of the chain necessary for these materials.
The iron shoe A of the lever B is, as will be seen from Fig. 1, provided on the
upper side of the lower end with two indentations a and b, which, according to the
outlines of the objects that are to be raised viz. sleepers, girders, beams etc., having
a suitable shape and serve as fulcrums for them. A U-shaped piece of iron e is
laid on the upper leaf of the shoe; and the U-iron, the shoe and the lever are
fastened together by means of the screws or rivets etc. d d, d. A socket fis
secured to the upper end of the U-iron by means of a screw-bolt e₁, the front-side
of which is closed, while the back side is open. Or the back-side may be closed
by a removable cover intended to prevent any dust, dirt etc. from entering.
Inside
In the front-plate of the socket there is an oblong rectangular opening,
through which bolt g provided with draw-hooks enters into the socket.
the socket the bolt is surrounded by a spiral spring h which is held tightly against
it by a nut i.
In front of the closed end of the socket there is guide-piece / having a vertical
slit k; this guide-piece terminates above in a kind of handle, towards the bottom
in a bolt 1, which passes through the lever and is fastened to the latter by means
of a nut m.
In order to be able to push this guide-piece upwards, the bolt 4 may be guided
inside the lever in a tube, and be supplied with a stop-mechanism at the lower end.
On the draw-hook of the bolt g a chain n is hung, at the free end of which is
attached a safety-hook o, which is to prevent the object, that is being raised
rom slipping off.
In order to have a firm support while using the lever, a trestle q is used.
After the lever has been pushed so far under the object that is to be raised,
hat the latter lies firmly on one of the notches a or b, and after the safety-hook o

page_text: has been hooked fast to the object, this trestle is pushed under the lever so that
the trestle now serves as fulcrum. A cross-piece which is let into the arm of
the U-iron serves for the reception of the hook, when the lever is being transported,
while the chain is retained in position in the U-iron itself.
As is mentioned at the beginning, the application of the lever in the displace- 5
ment of the materials of the superstructure of a railway is represented, while
the length of the chain at any time may be seen from Figure 6.
In this case it is assumed that the spiral spring has an elasticity of 4 inches,
which must be added to the length of the chain.
Fig. 1 shows the displacement of a rail; the lever is pushed from the side under
the rail. From the diagram (Fig. 6) the necessary length of the chain under 1
will be found to be 54 mm.
In Figs. 3 and 5 the displacement of a wooden or iron sleeper is shown, when
the sleeper is taken from the side.
The length of the chain may be seen from the diagram (Fig. 6) under No. 2
and amounts to 80 mm.
Figs. 4 and 5 (dotted) illustrate the displacement of a rail with a wooden or irou
sleeper.
The sleeper is taken at the head.
The diagram (Fig. 6) gives the length of the chain at 105 mm.
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:
Lever lifting jack with safety guard against slipping, distinguished by:
1. The arrangement of a shoe, the upper blade of which is provided with a
U-shaped iron for strengthening the shoe, the shoe being provided with notches (a, b)
for the reception of the object to be displaced.
2. The arrangement of a spring bolt g, in a revolving socket f, a correspondingly
long chain with safety-hook o, being attached to that end of the hook of the bolt g,
which lies outside the socket, for the purpose of preventing the object to be
displaced from slipping out of the notches (a, b) of the shoe.
Dated this 12th day of July 1895.
For OTTO WALTER,
Bernh. Brockhues.