Improvements in Lifting Jacks.
Year: 1889

page_text: Date of Application, 30th Apr., 1889
Complete Specification Left, 6th Nov., 1809-Accepted, 14th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Lifting Jacks.
Communicated to me from abroad by OSWALD JACKSON, of Carrollton, in the County
of Green, in the State of Illinois, one of the United States of America.
I ALBERT JACKSON of The Essex Bank Building, Church Street, Rochford, in the
County of Essex, Accountant do hereby declare the nature of this invention to be as
follows:-
The invention relates to the construction of lifting jacks for lifting and lowering
carriages and other bodies, and for holding such in their raised position, as for instance
to lift and hold up a carriage axle with its wheel free to rotate during washing or
other attention.
The improved lifting jack has a suitable extended base say a circular flange centrally
or otherwise of which is connected and rises a hollow standard carrying at its upper
part an arm to which is jointed a link which again is jointed near to the inner end of
a lever arm, said arm being the operated part, by the grasp of the user of its outer
end. The extreme inner end of this operating lever is jointed to a peculiarly formed
grasping piece.
This grasping piece is free to turn on its hinge or joint and is formed with a
diagonally placed opening through which passes a rod formed with a knob or enlarge-
ment which prevents its entire escape from its grasping piece and also serves as a
support to the lifted body.
This may be guarded with leather, rubber or otherwise, but this is seldom
needed.
In use the headed rod is raised to approximately the height of the body to be
lifted, and on depressing the raised operating lever the lifting head having always
a tendency to grip the rod by its upper acute angle or corner on one side and its
lower like angle at the other side, by reason of its tendency to drop to a dependent
position, it lifts the rod and the body to be raised and the link gradually assumes a
vertically locked position with the lever snugly and tightly lying against its side, so
that the greater the pressure the tighter the lock, but a very slight exercise of power
at the end of the lever will release the parts and permit lowering.
The lifted rod slides inside the standard which may be simply a tube or may be of
openwork or other design.
By means of a like rocking grasping piece placed in position attached to the
standard the first lift to the rod may be taken up thereby, a fresh hold taken by the
lever grip and so on, thereby securing successive lifts and greater height of raising of
the body.
1
.. 1000
COMPLETE SPECIFICATION.
Improvements in Lifting Jacks.
Communicated to me from abroad by OSWALD JACKSON, of Carrollton, in the County
of Green, in the State of Illinois, ono of the United States of America.
I ALBERT JACKSON of The Essex Bank Building, Church Street, Rochford, in the
County of Essex, Accountant, 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 invention relates to the construction of lifting jacks for lifting and lowering.

page_text: carriages and other bodies and for holding such in their raised position, as for instance
to lift and hold up a carriage axle with its wheel free to rotate during washing or
other attention.
The improved lifting jack has a suitable extended base say a circular flange, centrally
or otherwise of which is connected and rises a hollow standard carrying at its upper
part an arm to which is jointed a link which again is jointed near to the inner end of
a lever arm, said arm being the operated part, by the grasp of the user of its outer
end. The extreme inner end of this operating lever is jointed to a peculiarly
formed grasping piece.
This grasping piece is free to turn on its hinge or joint and is formed with a
diagonally placed opening through which passes a rod formed with a knob or enlarge-
ment which prevents its entire escape from its grasping piece and also serves as a
support to the lifted body.
This may be guarded with leather, rubber or otherwise but this is seldom
needed.
In use the headed rod is raised to approximately the height of the body to be
lifted, and on depressing the raised operating lever the lifting lead having always
a tendency to grip the rod by its upper acute angle or corner on one side and its lower
like angle at the other side, by reason of its tendency to drop to a dependent position,
lifts the rod and the body to be raised and the link gradually assumes a vertically
locked position with the lever snugly and tightly lying against its side, so that the
greater the pressure the tighter the lock, but a very slight exercise of power at the
end of the lever will release the parts and permit lowering.
The lifted rod slides inside the standard which may be simply a tube or may be of
openwork or other design.
By means of a like rocking grasping piece placed in position attached to the
, standard the first lift to the rod may be taken up theroby, a fresh hold taken by the
lever grip and so on thereby securing successive lifts and greater height of raising of
the body.
Fig. 1 is a vertical central sectional view of a carriage jack according to my
invention.
Fig. 2 is a front elevation of the same.
Fig. 3 is a central sectional vertical view of a modification of the same embodying
the holding ring C.
Figs. 4 & 5 are two side views of parts of the same shewing the ring (in and out
of use respectively for obtaining successive rises to the rod B.
A represents a tube or shaft having a base, A', and upon its upper end a flange
or collar a, from which projects on one side a lug, a', and the other side, when
the ring C hereafter referred to is employed, is notched or recessed, as seen at a²,
Figs. 3, 4 and 5.
In the tube A, and projecting somewhat above it, is a loose bar, B, provided with a
head, B. On this bar B, just above the tubo A, in the arrangement shewn by
Figs. 3, 4, 5 is a loose ring, C, having its central opening larger than the bar B and
cut through it at an angle.
This ring is on one side of its under face formed with a lug c, which may be
dropped into the recess a* in the flange a, in which case the ring will be flat upon the
tube or standard A and allow the bar B to rise and fall freely. If, however, the ring
be raised and turned until the lug c rests upon the flange a, the ring will be held in
this position at an angle to the rod or bar, and while allowing it to be lifted
the edges of its central opening will bite upon the rod and prevent its being
lowered.
In the arrangement shewn by Figs. 1 & 2 this ring C is dispensed with and a simple
lift is provided for.
D is a rocking grip or "sash-head," also provided with a diagonal central opening
larger than the rod or bar B, and under its rear side with two ears, dd, between which
is pivoted the upper end of a lever, E. Just below this point this lever is pivoted
between two links, D, which are secured. at their lower ends to the lug a¹, of the

page_text: flange a on the upper end of the tubular standard A. The head or casting D, being
secured to the links D¹ at one side of its centre, by its ears d d and the intervention of
the pivot end of the lever E has always a tendency to twist or set at an angle on the
rod B.
When the jack is to be used the lever is raised to lower the head or clutch D until
it will go no farther, and the rod B drawn up with the other hand until it is of the
proper height to engage with the object to be lifted. The lever now being depressed,
the clutch D, is twisted and grasps the rod B firmly. The descent of the lever lifts
the rod B, with the weight, against which it bears, and the upper ends of the links D'
pass inward until they are upright, and the three pivot-points of the links and lever
are directly over each other, and the rod can be lifted no farther. When it is desired
to lower the weight, this action is simply reversed. If one stroke of the lever is not
enough to lift the weight to the height required the ring C is turned until its lug
rests upon the collar or flange a and takes the weight off the bead D. The lever is
then raised and the head slips down for a fresh grasp of the rod. To lower the jack
in this position the ring C is turned until it falls to a horizontal position, and the rod
is lowered, as at first described, until the lever is raised to its highest point. Then use
the ring C to hold the rod while the head D is raised to grasp the rod again in a
higher place, and repeat this operation as may be desirable. The rod being grasped
by the twisting of the head D and ring C, is always held with a power proportioned to
the weight resting on the jack.
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. In a lifting-jack, a lifting-head provided with a diagonal opening through which
passes the lifting-rod, and connected at one side of its centre with an operating lever,
whereby the head slips easily down on the rod, but twists and tightly grasps it when
being raised, substantially as and for the purpose set forth.
2. In a lifting jack the locking ring C, having a lug, c, in combination with the
standard A, provided with recess a* and an elevating-bar, B, substantially as and for
the purpose set forth.
3. In a lifting jack, the standard A, having lug a³, recess a³, and elevating bar B,
in combination with the locking ring C, having a lug, c, and the lifting head D,
having a diagonal central opening, and pivoted at one side of its centre to the lever E,
connected by links D₁ to the standard A, substantially as and for the purpose
set forth.
Dated the 4th day of November 1883.
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicant.