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Патент USA US3052756

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Sept- 4, 1962
_
H. FRANKMANN I
3,052,745
SECONDARY ELECTRIC BATTERIES
Filed'Sept. 21, 1959
2 Sheets-Sheet 1
Inven'for
b
Hans FranKmann
H
A'l'i'orneyg,
Sept. 4, 1962
H. FRANKMANN
3,052,745
SECONDARY ELECTRIC BATTERIES
Filed Sept. 21, 1959
2 Sheets-Sheet 2
1:
Imrem‘or
Hans FranKmann
HE.
*E.
Fice
Unite States
2
1
be inactive to the effects of the liquids with which it will
normally come into contact. An eminently suitable ma
3,052,745
SECONDARY ELECTRIC BATTES
Hans Franlnnann, 3 Galway Grove, Greenhill, Wigan,
terial has been found to be hard cellular plastic.
The valve-carrying stem 15 is mounted Within the stop
Lancashire, England
per 13, said stopper 13 being adapted for screw-threaded
Filed Sept. 21, 1959, Ser. No. 841,136
Claims priority, application Great Britain Oct. 29, 1958
5 Claims. (Cl. 136-162)
attachment to the top 11a of the accumulator 11. Gas
vents 13a are provided in the stopper 13.
‘In the top of the bore hole 14 is connected a water
feed line 17, said feed line terminating at a ?ller cap 18.
This invention relates to secondary electric batteries
and is particularly, though not exclusively, applicable to
such batteries or accumulators, as they are called, as ?tted
to mechanically propelled vehicles for the ignition and/
or lighting system thereof in combination with a dynamo
3,952,745.
Patented Sept; 4, 1962
10
The ?ller 18 is provided with a cap 18a and serves as a
reservoir for distilled water.
In use, so long as the level of electrolyte in the accumu
lator remains at the requisite level, ?ow of distilled water
driven from the engine of the vehicle.
from the reservoir to the accumulator will be prevented
One of the main problems with such accumulators is 15 by the needle 12a of the valve assembly 12 extending
the attention necessary to maintain the correct level of
into and blocking the upper part 14a of the bore 14.
the acid or other dielectric by topping up with distilled
Upon a fall in electrolyte surface level, the ?oat 12b
water to replace loss by evaporation. The need for such
will be lowered and the needle 12a at least partially re
topping up varies with each vehicle, as Well as conditions
moved from the upper part 14a of the bore 14. Thus,
of use, and depends largely on the rate of charge and
distilled water may ?ow from the reservoir into the ac
the amount of current used. The main loss through
cumulator.
evaporation occurs through overcharging, that is to say,
When the electrolyte again reaches the requisite level
from continuation of charging after the fully charged
the needle valve will close.
state has been reached. Lack of frequent checking of
It has been found convenient to provide a common feed
level can cause damage by allowing the level to fall below 25 line for a plurality of accumulators, the capacity of the
that of the top of the plates, whilst ine?icient servicing
reservoir being such as to hold a given supply for said
can still leave the top of the plates uncovered, or alterna
tively, can result in over?lling. The latter can give rise
to loss of the di-electric which will result in damage to
plurality.
In an alternative embodiment, see FIG. 3, a valve cham
ber 21 for an inlet ball valve assembly 22 is formed in the
terminals or to any part with which it comes into contact. 30 ?ller plug 23 with outlet passages 24a, 24b leading from
The object of the present invention is a simple means
the upper end of the said chamber 21 to the lower end
for ensuring that the level of the electrolyte in each of
of the ?ller plug 23. Centrally of the plug 23 and lead
the cells is properly and automatically maintained at the
ing into the valve chamber 21 is a guide hole 25 for a
correct level at all times.
heading valve-operating stem 26, the head of which 26a
According to the invention, each cell is ?tted with a 35 is adapted to raise the valve ball 27 onto a seating 28
?oat-controlled inlet valve arranged to control the admis
formed in the upper end of the valve chamber 21. A
sion of make-up water from a reservoir.
tube 29 is located in the top of the plug 23, leading to the
The invention will now be described further, by way
valve chamber through the seating, and adapted at its
of example, with reference to the accompanying draw
upper end 2911 to receive a ?exible connecting. tube 30
ings, in which:
40 of suitable material, such as transparent plastic.
FIG. 1 shows in side view and partly in section, an
Complementary with such modi?ed ?ller plug is a ?at
accumulator having automatic liquid level adjustment
?oat (not shown) which may conveniently be made of
means.
hard cellular plastic, which ?oat is adapted to engage
FIG. 2 shows the sectioned part of FIG. 1 to a larger
the valve-operating stem to hold the valve ball against
45 its seating when the electrolyte in the cell is at the cor
scale, and,
FIG. 3 shows an alternative embodiment.
rect level.
Referring now to FIGS. 1 and 2 of the drawings, a
A multi-celled reservoir to hold distilled water may be
?oat-controlled inlet valve arrangement to allow for the
provided, said reservoir being mounted above the level
automatic adjustment of liquid level in an accumulator 11
of the accumulator and having the ?exible tubes from
includes a needle valve assembly 12 disposed within and
each ‘of the accumulator cells connected thereto.
beneath a stopper 13.
By means of automatic replenishing means construct
The valve assembly 12 includes a needle 12a mounted
ed in accordance with the present invention, periodic
for vertical reciprocating motion axially of the bore hole
inspection or ‘servicing will suffice, the time between suc
14 in a valve carrying stem 15, said bore hole 14 com
cessive servicings being dependent upon the capacity of
prising an upper part 14a and a lower, wider portion 14b 55 the reservoir and the number of cells supplied thereby.
in which said needle 12a moves. The upper pointed end
"In a further embodiment of the present invention the
of the needle 12a may extend into the upper part 14a of
valve operating stem 26 (FIG. 3) is secured to the ?oat.
the bore hole 14 partially to obstruct the same and thus
the latter being of such dimensions as to be capable of
control the rate of ?ow therethrough. The needle 12a
being removed from the top 11s: of the accumulator 11
is adapted for retention within the lower part of the bore 60 upon removal of the ?ller plug 23 therefrom. In the
hole 14 and allowed a limited movement longitudinally
further embodiment the ?oat is cylindrical, of an outer
thereof by means of a grub screw extending from the side
diameter of seven-eighths of an inch and ?ve-eighths of
of the bore hole and engaging an elongated recess in the
an inch deep. The ?oat is secured to the lower end of
side of the needle. Such retention means is not shown in
the drawings. A radially-directed through hole 16 is pro 65 the stem 26, the ?ange at the upper end of said stem 26
being removably secured thereto by screw threaded means.
vided in the wall of valve-carrying stem 15, said hole 16
In some arrangements the reservoir will be provided
being located adjacent the neck between the two parts
with outlet valve means, such means being manually op
14a, 14b of the bore hole and in the wider portion there
erated to permit the passage of make-up water from the
of. Said through hole 16 is in direct communication with
reservoir to the accumulator feed pipes and thence, as
the interior of the accumulator 11.
required to the accumulator cells.
In the lower end of the needle 12a is rigidly secured
The reservoir may be in the form of a funnel as shown
a ?at ?oat 12!), said ?oat being of such material as will
3,052,745
3
4
in the drawings, or alternatively, in the ‘form of a header
tank.
It will be evident from the foregoing that the ?ow of
water from the supply means to the supply side of ‘the
valve arrangement on the battery may be automatic, as
claim 1 outlet characterized in that said further passage
in the case when no outlet valve means is provided on the
water supply means, or controlled, as when outlet valve
means are provided.
I claim:
is horizontally directed at least where it connects with
the valve chamber.
3. Means for supplying topping-up water to the cells
of a multi-cell secondary electric battery according to
claim 1 outlet characterized in that said further passage
has a part thereof parallel to the ?rst passage where it
communicates with the interior of the cell.
4. Means for supplying topping-up water to the cells of
1. In a multi-cell storage battery having a ?lling open 10 a multi-cell secondary electric battery according to claim
ing in the top of each cell, a plug adapted to ?t into said
1 further characterized in that the diameter of said valve
cell, an integral externally threaded depending extension
is less than that of said through passage.
on said plug, a valve chamber in the upper end of said ex
5. Means for supplying topping-up water to the cells
tension, a through passage in the upper portion of said
of multi-cell secondary electric battery according to claim
plug for connection to a source of topping-up water and
1 further characterized in that said stem has a head the
communicating with said chamber, said extension having
diameter of which is less than that of the upper part of
a guide hole at its lower end communicating with said
said through passage but greater than the diameter of
chamber, a ?oat-operated stem slida‘bly located in said
said guide hole in which said stern operates.
guide hole, said ?oat being below said extension and at
tached to the lower end of said stem, the upper end of
said stem terminating in said chamber, a ball valve in
said chamber and remote ‘from said ?oat and resting on
said upper end and adapted to contact the lower end of
said through passage to close the ‘same, said extension
having at least one outlet passage separate from said guide 25
hole and extending from the lower portion of said exten
sion to communicate with said chamber and said through
passage, said extension being above the normal liquid
level of ‘said cell.
2. Means for supplying topping-up water to the cells 30
of a multi-cell secondary electric battery according to
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,354,800
1,361,437
Butler ________________ .. Oct. 5, 1920
Blau ________________ __ Dec. 7, 1920
1,421,582
Seng _________________ __ July 4, 1922
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Sartako? ____________ __ Oct. 9,
Johnson ____________ _._ Apr. 13,
Rainer _______________ __ Jan. 4,
Willits ______________ __ Jan. 10,
Orr _________________ __ June 6,
‘Martin et a1. _________ __ July 31,
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1938
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