Improvements in Hydraulic Rams.
Year: 1889

page_text: Date of Application, 4th Jan., 1889
Complete Specification Left, 2nd Oct., 1889-Accepted, 23rd Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Hydraulic Rams.
We HOWARD DEVENISH PEARSALL of Glenthorne, Orpington in the County of
Kent, Civil Engineer and JOHN WILLIAM GORDON of 2 Queensdown Road Lower
Clapton in in County of Middlesex Gentleman do hereby declare the nature of our
invention for IMPROVEMENTS IN HYDRAULIC RAMS to be as follows, that is
to say-
This invention relates to improvements in Hydraulic Engines such as are described
in the specification of Patent No. 8086 of the year 1885 granted to Howard Devenish
Pearsall aforesaid and relates to that part of such machines called the air valve, and
to mechanism for regulating the quantity of air retained in the chamber below
the delivery valves; which chamber may be, and is herein after called the ante
chamber.
The first improvement consists in controlling the quantity of air retained in the
ante chamber by altering the position of the mouth of the passage which permits
escape of the air so that at one position more air can escape than at another position.
If, for example, this passage is a tube passing through the roof of the ante chamber
from above then if the mouth of the tube does not descend into the ante chamber but
is flush with its roof all the air will escape from the said antechamber; but if the tube
be further lowered so as to dip into the antechamber, not all the air in the antechamber
can escape and soine will therefore be compressed and forced into the air vessel.
The second improvement consists in placing the float which actuates the air valve
in the passage or in one or more of the passages if more than one by which the air
escapes. This arrangement renders the use of a much smaller float, than would
otherwise serve, possible.
The third improvement consists in using an equilibrium valve, by preference a
double beat valve, for the said air valve.
The fourth improvement consists in connecting the dipping tube above describe
or the float which actuates the air valve with a float placed in the air vessel so as to
make the adjustment of the quantity of air retained in the antechamber depend
automatically on the level of the water in the said air vessel.
Dated this 21st day of December 1888.
H. D. PEARSALL.
J. W. GORDON.
COMPLETE SPECIFICATION.:
Improvements in Hydraulic Rams.
We HOWARD DEVENISH PEARSALL, of Orpington, in the County of Kent, Civil
Engineer, and JOHN WILLIAM GORDON, of 4, Plowden Buildings Temple, London,
Barrister-at-law, do hereby declare the nature of our Invention for "IMPROVEMENTS
IN HYDRAULIO RAMS" and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This Invention relates to Improvements in Hydraulic Engines such as are described
in Patent No. 8086 of 1885 granted to H. D. Pearsall Civil Engineer, of 3, Cursitor
Street Chancery Lane, and relates to that part of such machine called the air valve,
and to means for regulating the quantity of air retained in the chamber below the
delivery valves (which chamber may be called the ante chamber).
The first Improvement consists in controlling the quantity of air retained in the
ante chamber, by making the position of the mouth of the passage which permits
escape of the air, adjustable, so that in one position more air can escape than at

page_text: another position. For instance this passage may be a tube (called a dipping tube)
passing through the roof of the ante chamber into the ante chamber from above,
the depth of its descent being adjustable. Then when the mouth of the tube does
not descend into the ante chamber but is flush with its roof all the air will escape
from said ante-chamber but when the tube is further lowered so as to dip into the
ante-chamber, all the air in the antechamber cannot escape, and some of it will
therefore be compressed and forced into the air vessel. Instead of a pipe entering
the roof of the ante-chamber it may enter by the side, and instead of sliding it
may be hinged.
The second Improvement consists in placing the float which actuates the air
valve, in the passage or in one of the passages by which the air escapes, by which
arrangement it may be much smaller than if placed in the ante-chamber.
The third Improvement consists in using an equilibrium valve, by preference a
double-beat valve for said air-valve.
The accompanying drawing shows all these improvements in combination-but
we do not confine ourselves to this arrangement.
a. is the roof, or cover, of the chamber described in Patent No. 8086 of 1885.
1. is a tube leading to double-beat air-valve c, and sliding in sleeve d, in such a
manner that it can be raised or lowered in the chamber.
e. is a float contained in said tube and attached to said air-valve.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is:-
1. In Hydraulic machines having a chamber such as is described in Patent
No. 8086 of 1885, regulating the quantity of air compressed, by making the position
of the orifice, leading to air-escape valve, adjustable.
2. In Hydraulic machines. having a chamber such as is described in Patent
No. 8086 of 1885 placing a float to actuate the air-escape valve in a passage
smaller than the principal chamber.
3. In Hydraulic machines having a chamber such as is described in Patent
No. 8086 of 1885 using an equilibrium valve, by preference a double-beat valve,
for shutting off the exit of air from same.
4. In Hydraulic machines having a chamber such as is described in Patent
No. 8086 of 1885, the combination of a tube leading to air-valve and containing
a float attached to said air-valve, and which tube can be raised or lowered in the
chamber aforesaid.
11
1000
H. D. PEARSALL.
J. W. GORDON.