Improvements in Lifting Jacks.
Year: 1889

page_text: Date of Application, 20th May, 1889
Complete Specification Left, 7th Nov., 1889-Accepted, 7th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Lifting Jacks.
A communication from abroad by CHARLES THÉODORE NAPOLÉON PASCHALI,
Merchant, Boulevard Séguin à Oran, Algeria.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of. the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both in
the County of Lancaster, and 323, High Holborn, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object certain improvements in screw jacks whereby any
accident is prevented when one of these machines is used.....
The jack comprises a wooden frame fitted at the top with an iron head piece. In
the interior of this frame there is a long square threaded or other shaped screw.. This
screw is fitted at its upper end with a nut which is placed, in the head piece and has a
number of teeth on its outer periphery engaging with the teeth of a pinion..
On the spindle of this pinion is fixed a second pinion which engages with a spur
wheel, driven by means of a suitable handle..
17
It is easy to see that if the spur wheel is set in motion by means of the handle
aforesaid, it transmits its movement to the said second pinion, and then to the first
pinion. The latter turns the screw nut aforesaid, the internal thread of which moves
the long jack screw. By turning one way, the screw is caused to ascend, and by
turning the contrary way to descend.
The above arrangement may be modified by replacing the rack screw by a rack
which is turned by means of a helicoidal screw and pinion, the latter being driven by
a pinion by means of the handle aforesaid.
The mode of working this second arrangement may be easily understood.
This improved screw jack has the advantage of not causing any accidents, and
besides this it rises rapidly. To quicken the speed in descending, the rack can be.
released while still supporting the load by means of a friction spring arranged in the
slide inside the frame.
Dated this 18th day of May 1889.
1
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Lifting Jacks.
A communication from abroad by CHARLES THÉODORE NAPOLÉON PASCHALI,
of Boulevard Séguin d'Oran, Algeria, Merchant.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both in
the County of Lancaster, and 323, High Holborn in the County of Middlesex, Civil
Engineer, 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 has for its object certain improvements in screw jacks, whereby any
accident is prevented when one of these machines is used.
The jack comprises (Figures 1, 2 and 3 of the annexed drawings) a wooden frame
A, B, C, D, fitted at the top with an iron head piece E F. In the interior of this
frame, there is a long square threaded or other shaped screw G G. This screw is
fitted at its upper end with a nut H, which is placed in the head piece E F, and the
[Price 6d.1

page_text: nut H has a number of teeth on its outer periphery, engaging with the teeth of a
worm I.
On the spindle of this worm I is fixed a pinion J, which engages with a spur
wheel K driven by means of a suitable handle İ.
It is easy to see that, if the spur wheel K is set in motion by means of the
handle Laforesaid, it transmits its movement to the said pinion J, and then to
the worm I. The latter turns the screw nut H aforesaid, the internal thread of
which moves the long jack screw G. By turning one way, the screw G is caused
to ascend, and by turning the contrary way, to descend.
The above arrangement may be modified, as shown in Figure 4, by replacing
the screw G by a rack G¹ which is turned by means of a helicoidal screw and
pinion Hthe latter being driven by a pinion I', by means of the handle aforesaid.
The mode of working this second arrangement may be easily understood.
This improved screw jack has the advantage of not causing any accidents, and
besides this, it rises rapidly. To quicken the speed in descending, the rack can be
released, while still supporting the load, by means of a friction spring arranged in the
slide inside the frame.
1
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
The system or arrangement of screw jacks substantially as above described
and represented in Figures 1, 2 and 3; as well as the arrangements shown in
Figure 4.
Dated this 6th day of November 1889.
WM. P. THOMPSON & CO.,
Agents for the Applicant.