AN IMPROVED LIFTING JACK
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We, DAVID LLOYD, of 34 Princes Road, Notting Hill, Mechanic, and SIDNEY
BURGE, of 9 Frankfort Terrace, Harrow Road, Boot Maker, both in the County of
Middlesex, do hereby declare the nature of our invention for "AN IMPROVED
LIFTING JACK" to be as follows:-
Our invention relates to an improved lifting jack of simple construction by means
of which the raising or shifting of any object to which it is applied is greatly
facilitated, and the cost of the jack is materially diminished.
It consists of a suitable base plate from which two uprights extend upwards any
suitable distance. Between these uprights near the bottom is pivotted a hand
lever, with a bent projection or cam surface extending beyond the pivot.
Over the uprights a box like casing is placed, and is capable of a limited
movement thereon in a vertical direction, a cross bar consisting of a rod or piece of
metal or other suitable material being passed between the uprights and secured to
the two sides of the lower end of the casing, so as to form a bearing surface against
which works the projection or cam surface extending beyond the pivot of the
hand lever,
The uprights extend up to such a height that the top end of the box casing rests
thereon when in its lowest position. The upward movement of the casing is
limited by making a slot or recess in one or both of the uprights at a certain
height, and inserting a screw from outside the casing so that its inner end engages
with such slot.
The top end of the box casing is open and a bar is inserted therein and passes
between the uprights which act as guides. This bar is formed with a rack having
ratchet shaped teeth on one edge, and is provided with a lifting head at its upper
end which is outside the top end of the casing, the whole bar being capable of
sliding in the casing for the purpose of adjusting the lifting bead to any required
height. For the purpose of enabling the bar to be held firmly in any position to
which it may have been raised or lowered, a pawl preferably acted upon by a
spring is caused to engage with the teeth of the rack, which are preferably formed
in a direction to permit the pawl to slip over them when the bar is lifted in an
upward direction, whereby the pawl has only to be disengaged when it is desired
to lower the bar with its lifting head. This pawl consists preferably of a short
lever pivotted near its centre in a vertical position on the outside of that face of

page_text: the box casing towards which the teeth of the rack on the bar are directed, the
lower end of the lever being free for the pressure of the hand to be applied thereto,
and a spring arranged between this end and the casing so as to act in opposition to
such pressure, and return the lever always to the same position when the hand is
removed. The upper end of the lever forms the pawl and is provided with one,
two or more teeth which engage between the teeth of the rack when the lever is in
its normal position, the teeth on the end of the lever preferably passing for this
purpose through a slot near the upper end of the casing.
The operation of the jack is as follows:-
The hand lever is raised to a vertical position against one side of the casing, 1
whereby the projection or cam surface at the other side of its pivot is moved so as
to allow the box casing (and with it the bar contained therein) to descend to its
lowest position on the uprights. The base plate is then placed on any suitable
support (depending upon the position and nature of the object to be raised or
shifted), and the sliding bar is raised or lowered in the box casing so as to bring
its lifting head in contact with the surface of the object to be acted upon, the pawl
retaining the bar in such position. By then turning the hand lever on its pivot,
its projection or cam surface will be brought to act upon the cross bar at the
bottom of the box casing, and so gradually raise such casing on the uprights until
the-hand-lever-reaches_the_end of its movement. As the bar carrying the lifting 2
head rises with the casing--the object will be lifted or moved-in-the-required
direction,
To lower the casing again the hand lever is moved in the reverse direction back
.to its original position, and to lower the sliding bar in the casing the pawl is
removed from engagement with the teeth of the rack on the edgo of such bar.

page_text: We, DAVID LLOYD, of 34 Princes Road, Notting Hill, Mechanic, and SIDNEY
BURGE, of 9 Frankfort Terrace, Harrow Road, Boot Maker, both in the County of
Middlesex, do hereby declare the nature of our invention for "AN IMPROVED
LIFTING JACK," and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
Our invention relates to an improved lifting jack of simple construction by
means of which the raising or shifting of any object to which it is applied is greatly
facilitated, and the cost of the jack is materially diminished.
Our invention is illustrated in the accompanying sheet of drawings, in which
Fig. 1 is a side elevation of the improved jack when closed up or not in use.
Fig. 2 is a vertical section of same showing the parts in the position they assume
when in use, and
Fig. 3 is a section at right angles to Fig. 1, showing the parts in the closed
position.
It consists of a suitable base plate A from which two uprights B, B², extend
upwards any suitable distance. Between these uprights near the bottom is pivotted
a hand lever C, with a bent projection or cam surface D extending beyond the
pivot.
Over the uprights a box like casing E is placed, and is capable of a limited
movement thereon in a vertical direction, a cross bar F consisting of a rod or pieco
of metal or other suitable material, being passed between the uprights B, B¹, and
Becured to the two sides of the lower end of the casing E, so as to form a bearing
surface against which works the projection or cam surface D extending beyond the
pivot of the hand lever C.
The uprights B, B¹, extend up to such a height that the top end of the box
casing E rests thereon when in its lowest position (as shown in Fig. 3). The
upward movement of the casing is limited by making a slot or recess G in one or
both of the uprights B, B', at a certain height, and inserting a screw H from
outside the casing so that it engages with such slot.
The top end of the box casing is open and a bar I is inserted therein and passes
between tho uprights B, B', which act as guides. This bar is formed with a
rack I, having ratchet shaped teeth, on one edge, and is provided with a lifting
head J at its upper end, which is outside the top end of the casing E, the whole
bar I being capable of sliding in the casing E for the purpose of adjusting 'the
lifting bead J to any required height. For the purpose of enabling the bar to be
held firmly in any position to which it may have been raised or lowered, a pawi,
preferably acted upon by a spring, is caused to engage with the teeth of the rack I¹,
which are preferably formed (as shown) in a direction to permit the pawl to slip
over them when the bar is lifted in an upward direction, whereby the pawl has
only to be disengaged when it is desired to lower the bar I with its lifting head J.
This pawl consists preferably of a short lever K pivotted near its centre in a
vertical position on the outside of that face of the box casing E towards which the
teeth of the rack I³ on the bar I are directed, the lower end of the lever K being
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