Improved ing-Jack.
Year: 1897

page_text: Date of Application, 30th Aug., 1897-Accepted, 28th May, 1898
Improved ing-Jack.
We, ALBERT SCHOLER and GEORG Ewald Schmidt, both of Remscheid, Rhenish
Prussia, Germany, and both Merchants, 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:-
to
This invention relates to improvements in lifting jacks and it has for its object
arrange the gearing of the apparatus in such a way, that a load put thereon
can be raised by the rack first and then by the box or casing, or vice versa, without
requiring to support the load temporarily by other auxiliary means, as is the
case with ordinary lifting jacks, in order to allow the withdrawal of the apparatus
so, that it may be set in condition for a second lift. In working with our improved
lifting jack this remains in its place when the first lifting has been done and
continues to support the load, the only thing to be done, is to place between the
top of the box and the load, (when the first lifting had been done by driving the
rack upwards), or between the top of the rack and the load, (when the first lifting
had been done by raising the load by the box, which in this case is moved up
along the rack, the latter standing fast upon the ground), a suitable filling piece,
then to turn the handle in the reverse way to that in which it was turned by the
first lifting. By this means we can raise a load to double the height, or nearly
so, to that with a similar lifting jack of same length of box and rack, but of old
construction, that is to say, not provided with our improved gearing.
Our improved lifting jack is shown on the accompanying drawing in which
Fig. 1 is a side view with the rack raised its full height, with a filling piece
in place.
Fig. 2 is a view seen from the right side of Fig. 1 without the filling piece;
Fig. 3 is a similar view to the preceding one, but with the rack supported below
and the filling piece put on top of the casing and this raised above ground;
Fig. 4 is a side view of the upper filling piece:
Fig. 5 is a part front view showing the arrangement of the ratchets and pawls
to prevent the running back of the gearing;
Fig. 6 is a side view of Fig. 5;
C
Fig. 7 is a cross section of the upper filling piece:
Fig. S is a cross section of the lower filling piece.
The rack, which is enclosed in the box or casing is driven up and down
as usual by a pinion e which may be driven as in ordinary lifting jacks either
direct or by multiple gear, by the crank handle d. In the example shown, double
gear is used, a pinion being placed upon the crank-axle and this pinion
gears with the rack pinion c, therefore when turning the crank, as indicated by
the arrow, the rack will be raised. A ratchet wheel e and pawl e¹ in this case
prevent the running back of the loaded rack.
When the load has been raised in this way, as indicated by Fig. 2, the filling
piece f is placed under the claw a of the rack between it and the foot board o,
and the filling piece is put on the top of the jack casing between the load

page_text: and the casing; the pawl e' is then withdrawn and the pawl is placed in
working order with regard to its ratchet wheel h, as indicated in dotted lines in
Fig. 5 and now the crank is turned in the opposite direction, and it will be under-
stood, that because the rack can not go down, on account of its being supported
and stayed by the filling piece f, the casing b will be raised along the rack and
with it the filling piece and the load now taken up by this filling piece. This
sort of lifting can be carried so far, until the casing has arrived at the position
shown by Fig. 3. when the claw a prevents the further elevation.
If now the foot of the casing is propped again so that it gets a firm stand, the
ratchet pawls can be reversed again and by turning the handle in same direction
as in the first instance the rack will be raised again and it will now lift the load
in its turn and continuing so on alternately, a load can be raised without requiring
to withdraw the lifting-jack or to wind the rack down, only the propping of the
same is required once under the bottom of the casing and then under the claw a¹.
It will be observed that the filling piece f is so shaped that its central part fl
will reach into the channel of the casing provided for the rack, whilst its sides
support the bottom of the casing: and the filling piece has a central excava-
tion g for the rack to pass through when it is raised. This is to give the whole
apparatus more stability when the filling pieces are used.
A great saving of time is gained and greater security obtained because there
are less removals of blocks, supporting pieces and the like.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1.) In a lifting-jack in combination with a casing a rack a lodged in said
casing and capable of being raised and lowered therein, a crank axle and a
crank setting said rack in motion by single or multiple gear, a ratchet wheel c
on said crank axle d and a corresponding pawl el, a ratchet wheel on same
axle having its teeth standing in opposite direction to those of ratchet e, and
a pawl to suit the ratchet wheel h, the whole as set forth and for the purpose
specified.
2.) In a lifting-jack in combination with a casing b, a rack a lodged in said
casing and capable of being raised and lowered therein, a crank axle and a
crank d setting said rack in motion by single or multiple gear, a ratchet wheel c
upon said crank axle and a corresponding pawl el, a ratchet wheel on same
axle having its teeth standing in opposite direction to those of the ratchet
wheel e and a pawl to suit the ratchet wheel h, a filling piece f to fit the lower
part of casing b, and a filling piece g to fit the top of the casing band having an
excavation to allow the rack to pass through, the whole as described and
illustrated and for the purpose set forth.
Dated this day of 27th August 1897.
ALBERT SCHOLER,
GEORG EWALD SCHMIDT,
Per Karl J. Mayer,
Agent.