Year: 1896

page_text: I, WESLEY CLARK CRAWFORD of Kent, County of Jefferson, Indiana, U.S.A.,
Minister, do hereby declare the nature of this invention to be as follows:--
This invention relates mainly to lifting jacks of the kind that are employed in
connection with waggons carriages and the like. It comprises a standard in two
parts provided with means for vertical adjustment such as a tongue on the one part
slideable in a recess in the other part and fixed by crosspins. Near the top of the
standard is pivotted a slotted lifting lever, and on the opposite side of the standard
on the same pivot, a loose wheel, the periphery of which projects a little beyond
the standard. In the lifting operation the standard is inclined so as to rest upon a
bottom corner; the handle of the lever is then depressed to raise the axle of the
vehicle until the weight is shifted from the lever to the loose wheel which revolves
and causes the standard to come into the upright position, and finally the axle
leaving the wheel, finds support on the top of the standard.
Dated this 26th day of May 1896.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.
I, WESLEY CLARK CRAWFORD of Kent, County of Jefferson, Indiana, U.S.A.,
Minister, 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 :-
This invention whilst relating to lifting jacks generally is especially directed to
improvements in that class of jacks which are employed in connection with waggons
and other vehicles.
In the accompanying drawing
Fig. 1 is a perspective view of the lifting jack of this invention.
Fig. 2 an elevation of the jack with its position before lifting in full lines, and
after lifting, in dotted lines.
Fig. 3 a back view of the jack with a portion broken away to shew the preferred
means for vertical adjustment.
A is a standard which supports the working parts and receives the weight of the
object lifted. Said standard is preferably of rectangular form and is provided with
any suitable means for vertical adjustment, the preferred means being to form the
standard in two parts, the upper of which a, has a tongue a' slidably arranged in
recess a² of the lower part a3 which latter and the tongue are provided with
'מ

page_text: transverse holes a through which is passed a latch pin or pins 6 whereby the upper
part a is supported at any desired height. On the outer sides of the lower part a³
are plates c which form walls for the recess a². Near the top of the upper part a
is a pin d projecting beyond each side of said part and a loosely mounted wheel e
carried on one end of the same, whilst the other end forms a pivot for an operating
lever f. This end of the pivot may be screw-threaded and provided with a nut d
and washer. That corner of the standard adjacent to the wheel is rounded
concentrically with the wheel but with a radius somewhat less in order that the
wheel may project slightly beyond the standard. The inner end of the operating
lever is designed to project beyond the standard and the periphery of the wheel.
The lever is held on the pivot by a longitudinal slot. The base of the standard
is sufficiently wide to permit the jack to stand by itself when placed vertically.
In the operation of lifting, say a waggon body, the jack is placed in the inclined
position shewn in full lines in Fig. 2, with the lower corner on the ground,
directly beneath the axle g to engage the same with the lifting end of the lever
and the periphery of the wheel e. With the parts in this position the handle enl
of the lever is depressed and the lifting end is consequently elevated, thereby raising
the axle and body of the waggon until the weight of the latter is shifted from the
lever to the wheel which revolves owing to its contact with the axle and the move-
ment of the body. The wheel as it revolves and receives the weight causes the
standard to automatically take a vertical position and finally the axle, leaving the
wheel, finds support on the top of the standard beyond the wheel as shewn in dotted
lines in Fig. 2 and the operation is completed. The provision of the slot fin
the operating lever insures the proper operation of the device at all times inasinuch
as the weight to be raised may always be brought into contact with the wheel by
shortening the lifting end of the lever.
From the foregoing it will be evident that manual power is necessary only to
start the device, or in other words, the lever is out of operation so soon as the axle
which is in engagement with the wheel shall have passed the dead centre, after
which the automatic restoration of the vertical position completes the elevation of
the waggon body.
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. A lifting jack comprising a standard, a wheel mounted at one side of the
upper end thereof and projecting beyond said end, and a lever the lifting end of
which projects beyond the periphery of the wheel, substantially as described and
shewn.
2. A lifting jack comprising a standard vertically adjustable and having a
rounded upper corner, a wheel mounted on the standard and projecting beyond
said corner, and a lever pivotted on the opposite side and having the lifting
end projecting beyond the periphery of the wheel, substantially as described and
shewn.
3. A lifting jack comprising a vertically adjustable standard having a broad base
and a curved upper corner, a wheel mounted on a pin and projecting beyond said
curved corner, and an operating lever having a slot through which said pin passes,
the lifting end of the lever projecting beyond the periphery of the wheel, substau-
tially as described and shewn."
Dated this 17th Ja
1005
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.