Improvements in or connected with Hydraulic Accumulators.
Year: 1896

page_text: Date of Application, 22nd Apr., 1896
Complete Specification Left, 16th Jan., 1897-Accepted, 17th Apr., 1897
PROVISIONAL SPECIFICATION.
Improvements in or connected with Hydraulic Accumulators.
We, WILLIAM WILKINSON, und HERBERT ALEXANDER, of The Queen's Engineering
Works, Water Lane, and GEORGE PEARSON WALLIS, of Hall Lane, Armley, all of
Leeds, in the County of York, Engineers, do hereby declare the nature of this
invention to be as follows:-
The object of our invention, is to construct simple and efficient apparatus whereby
an hydraulic accumulator may be automatically connected with the force pumps when
the said accumulator has descended a given distance, the said connection being closed
on the return of the accumulitor to the top of its stroke. We will now proceed to
describe our invention with referonce to a self contained box accumulator, though it
must be clearly understood that we do not confine ourselves to this particular class of
accumulator.
According to our invention, we provide a check valve between the pump or pumps.
and the accumulator, the said check valve being of such construction that it closes on
receiving a back pressure from the accumulator. A relief valve is situated between.
the check valve and the pump, and on the said relief valve being operated the flow
of water from the pump is allowed to return to the pump tank without passing to.
the accumulator. A vertical rod is provided being hold in position by suitable
guides, and the said rod is connected by means of suitable arms or levers with
the relief valve above mentioned, in such a manner that on the rod rising the relief
valve is opened, and on the falling of the said rod the relief valve is closed. The
rod is balanced by a weight which is sufficiently beavy to balance the rod and to
tend to keep the relief valve open, and a counter-balance weight is provided on the
rod, being supported on the said rod by a collar attached to same and being
prevented from sliding vertically on the rod beyond a certain distance by means.
of another collar situated on the rod above the counter-balance weight. To the
side of the accumulator casing a bracket is provided, being so constructed and
arranged that on the rising of the accumulator it will engage with the counter-balance
weight and lift same.
When the apparatus is at the top of its stroke, the bracket on the casing supports
the weight in the up position, holding the rod up and allowing the flow of liquid from
the pump to pass through the relief valve. On the accumulator being called into
action and descending, the descent is made for a certain distance, which may
previously be adjusted by setting the collars on the rods in the desired positions, and
on the counter-balance weight being lowered onto the lower collar the rod is depressed.
thus closing the relief valve. The pump now forces the water through the check
valve to the accumulator and this action continues until the said accumulator has
reached its highest point, when the rising of the counter-balance weight actuates the
rod and opens the relief valve.
It will thus be seen that the working traverse of the accumulator may be regulated
to any given distanco throughout its stroke, which is a great advantage as the
continual knocking off is prevented thus taking considerable strain off the valves.
Apparatus constructed according to our invention, is of simple and inexpensive
construction, and when required it may be fitted to accumulators at present in use.
11000

page_text: Improvements in or connected with Hydraulic Accumulators.
We, WILLIAM WILKINSON, and HERBERT ALEXANDER, of The Queen's Engineering
Works, Water Lane, and GEORGE PRARSON WALLIS, late of Hall Lane, Armley, but
now of Mount Royal, Horsforth, all of Leeds, in the County of York, Engineers, do
hereby declare the nature of this invention, and in what mannor the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
The object of our invention, is to construct simple and efficient apparatus whereby
an hydraulic accumulator may be automatically connected with the force pumps when
tho said accumulator has descended a given distance, the said connection being closed
on the return of the accumulator to the top of its stroke. We will now proceed to
describe our invention with reference to a self contained box accumulator, though it
must be clearly understood that we do not confine ourselves to this particular class of
accumulator.
The accompanying drawings clearly illustrate our invention, and the same letters
refer to like parts in all the figures.
Figure 1 is a side elevation of a box accumulator fitted with
according to our invention, and Figure 2 is a plan of same.
detail views.
apparatus constructed
Figures 3, 4 and 5 are
According to our invention, we provide a check valve A, which is connected by
means of the pipe B with the base of the accumulator C. D is a pipe which is
connected with the pump or puups, and E is a relief passage which connects the
valve A with the reservoir or other overflow. F is a valve which prevents pressure
passing from the accumulator C to the pipe D, and G is a valve situated at the mouth
of the passage E, the said valve G being carried on the end of a spindle g. H is a
rod, the lower end of which is connected to a lever J which is fulcrumed at j on the
check valve A, and the lowor end of the spindle y rests on the surface of the lover J.
The rod H is connected by means of a chain with a weight K, which latter is.
sufficiently heavy to balance the rod H and to tend to keep it in the up position;
and L is a counterbalance weight which is supported on the rod by a collar M, and
the vertical movement of the weight L on the rod H is confined to a certain distance
by means of a collar N. To the side of the casing of the accumulator, a bracket P is
provided, being so constructed and arranged that on the raising of the accumulator it
will engage with the counterbalance weight and lift same.
When the accumulator is at the top of its stroke, the bracket P supports the
weight L in the up position (as seen at Figure 1) thus holding the rod H, lever J and
spindle g in the up position. The holding up of the spindle g opens tho valve G, so
the flow from the pump or pumps which is entering the valve A through the pipe D
in following the line of the least resistance flows through the relief passage E and
thence to the reservoir or other overflow. On the accumulator being brought into
action, the descent is made for a certain distance which is predetermined by the
adjustment in the position of the collar M, and on the counterbalance woight L being
lowered onto the collar M, the rod II is depressed thus allowing the spindle g to
descend and so close the relief valve G. The pressure from the pump thus pressos on
the upper surface of the said valve G keeping it securely closed, and the valve F
is consequently opened, thereby allowing the flow to proceed through the pipe B
to the accumulator C. The flow continues through the pipe B until the accumulator
has risen sufficiently to allow the brucket P to lift the weight L into contact. with
the collar N, when the rod is again lifted and the flow froin the pump or pumps is
allowed to flow through the relief valve G.
It will thus be seen that the working traverse of the accumulator may be regulated

page_text: to any given distance throughout its stroke, which is a great advantage, as the
continual knocking off is prevented, thus taking considerable strain and wear off.
the valves.
Apparatus constructed according to our invention, is of simple and inexpensive
construction, and when required it may be fitted to accumulators at present in use.
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. A relief valve, actuated by the rising of the accumulator, in such a manner
that the accumulator descends a predetermined distance before the feed is allowed
to again flow to the accumulator, tho said distance being adjustable according to
requirements, substantially as and for the purposes set forth.
2. The relief valve A, rod H, collars M and N, weight L, and bracket P,..
substantially as and for the purposes set forth.
3. The relief valve A, having pipes B and D, valves F and G, and spindle g in
same, in combination with the rod I carrying collars M and N, weights K and L, and
bracket P, substantially as and for the purposes set forth.
4. The general arrangement, construction and combination of the various parts,.
forming our invention for improvements in or connected with hydraulic acoumulators,
substantially as and for the purposes set forth, together with any mere modification or
modifications thereof.
Dated this 16th dox of January 1897
BREWER & SON,
London and Leeds, Agents for the Applicants.