Improvements in Hydrostatic Lifting Jacks.
Year: 1892

page_text: Date of Application, 23rd Sept., 1892
Complete Specification Left, 19th Apr., 1893-Accepted, 15th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Hydrostatic Lifting Jacks.
I RALPH TAYLOR 29, Addison Road, Heaton Newcastle-on-Tyne Engineer do
hereby declare the nature of this invention to be as follows:-
:-
The object of this invention is to render hydrostatic lifting jacks more safe and
reliable than hitherto, especially that class having the cistern contained in the bead
or lifting part.
In these the relief passage is generally cut across the threads of the faucit into
which the pump spigot is screwed. leaving not more than two whole threads to
resist the pressure between the cylinder and cistern which fail to prevent the water,
when under pressure, from passing from the former to the latter and thereby
causing inconvenience and in some cases danger.
To remedy this I propose forming the said escape passage in the solid body of
the jack; or in a bush screwed into the before mentioned faucet.
Dated this 21st day of September 1892.
RALPH TAYLOR.
COMPLETE SPECIFICATION.
Improvements in Hydrostatic Lifting Jacks.
RALPH TAYLOR, Engineer 29 Addison Road Heaton Newcastle on Tyne, 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 object of this invention is to render hydrostatic lifting jacks more safe and
reliable than hitherto, especially that class having the cistern contained in the head
or lifting part.
In these the relief passage is generally cut across the screw threads of the faucet
into which the pump spigot is screwed leaving not more than two threads to resist
the pressure between the cylinder and cistern which fail to prevent the water,
when under pressure from passing from the former to the latter, and thereby
causing inconvenience and in some cases danger.
Figure 1 is a sketch showing the present system adopted in forming the aforesaid
relief passage, and it is quite evident that the failure of these jacks is due to the fact
that the pressure in the relief passage marked B, (Figure 1) being the same as
that contained in the cylinder, the weak point previously referred to and marked C
(Figure 1) becomes strained, and eventually the water passes through that channel
to the cistern, from the cylinder, and the jack ceases to be of use until repaired.
To remedy this I propose forming the said escape passage in the solid body of
the jack, or in a bush screwed into the before mentioned faucet as shown, and
marked A. (Figure 2).
It will thus be seen, that in my system communication between the cylinder and
the cistern is practically impossible, otherwise than through the agency of the
"lowering screw which should be the only escapement, and must be released
before the jack can be lowered.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be carried out, I declare that what I
claim is,
That my invention is a new and improved system of forming an escape passage
in hydrostatic lifting jacks.
Dated this 1st day of June 1893
RALPH TAYLOR,
Applicant.