U.S. patent application number 11/850045 was filed with the patent office on 2007-12-27 for apparatus for connecting a battery plate to a metal strap or post.
This patent application is currently assigned to TBS ENGINEERING LIMITED. Invention is credited to Christopher BARGE, Robert HOPWOOD.
Application Number | 20070295886 11/850045 |
Document ID | / |
Family ID | 9952211 |
Filed Date | 2007-12-27 |
United States Patent
Application |
20070295886 |
Kind Code |
A1 |
HOPWOOD; Robert ; et
al. |
December 27, 2007 |
APPARATUS FOR CONNECTING A BATTERY PLATE TO A METAL STRAP OR
POST
Abstract
This invention relates to apparatus for connecting a battery
plate to a metal strap or post or to moulds therefor. In contrast
to existing arrangements lead is fed to the feed passage 17 via an
opening 20 which is positioned immediate the ends of the aligned
cavities in the set 14 of the mould. This arrangement enables the
cavities to be fed with lead at approximately the same time and
hence the dip of the lugs into the cavities can be optimised
without any significant difficulties. In itself this substantially
increases productivity. It has also been found that up to three
batteries can be cast simultaneously, particularly if bypasses 16c
are used for fine tuning the lead supply.
Inventors: |
HOPWOOD; Robert; (Somerset,
GB) ; BARGE; Christopher; (Bristol, GB) |
Correspondence
Address: |
YOUNG & THOMPSON
745 SOUTH 23RD STREET
2ND FLOOR
ARLINGTON
VA
22202
US
|
Assignee: |
TBS ENGINEERING LIMITED
CHELTENHAM
GB
|
Family ID: |
9952211 |
Appl. No.: |
11/850045 |
Filed: |
September 5, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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10543774 |
May 24, 2006 |
|
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PCT/GB2003/005562 |
Dec 19, 2003 |
|
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11850045 |
Sep 5, 2007 |
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Current U.S.
Class: |
249/83 |
Current CPC
Class: |
B22D 25/04 20130101 |
Class at
Publication: |
249/083 |
International
Class: |
B22D 19/04 20060101
B22D019/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 31, 2003 |
GB |
0302268.8 |
Claims
1. A mould for apparatus for connecting a battery plate to a metal
strap or post, the mould including an aligned set of post or strap
cavities, a molten metal feed duct for feeding all the cavities in
the set and extending adjacent thereto, a weir between the feed
duct and the cavities, a feed passage extending below the feed duct
for supplying molten lead to the duct and for allowing drain back
of the lead characterised in that there is at lest one body
disposed in the feed duct so as to reduce the volume of the part of
the feed duct, which lies between the lowest and highest level in
the duct for lead in a cycle.
Description
FIELD OF THE INVENTION
[0001] This invention relates to apparatus for connecting a battery
plate to a metal strap or post or moulds therefore.
BACKGROUND OF THE INVENTION
[0002] The term "battery" is used herein to include accumulators.
In a conventional lead acid battery it is customary to connect
together the plates of each stack by means of a lead strap or post
which is fixed to aligned lugs or tabs on the plate. As is
explained in detail in WO 94/16466, the disclosure of which is
incorporated herein, with bigger moulds problems can arise in
flowing sufficient lead into the cavities in the moulds and the
solution postulated in that case was to have a pair of these
passages for a set of cavities so that one half of the set was fed
from one of the feed passages, whilst another half of the set was
fed from the other, As is discussed in WO 94/16466, this approach
had many advantages and the mould has been extremely
successful.
[0003] However, problems have arisen in getting consistent post or
strap quality, because, as the applicants have now appreciated,
that part of the set which lies nearest the pump can be filled up
to half a second earlier than the second set of cavities, fed by
the other passage, which are more remote from the pump. As the lugs
can only be dipped at a single instant it is very difficult to
optimise the moment of dipping in relation to cavity fill and this
can affect not only the final shape of strap or post moulded, but
also on the quality, because the thermal exchange that takes place
on dipping will vary in dependence on the amount of lead in the
mould.
[0004] Attempts have been made to solve this problem by very
accurate automisation of the system, but the applicants have now
realised that surprisingly a much cheaper and simpler solution can
be adopted.
SUMMARY OF THE INVENTION
[0005] Thus from one aspect the invention consists in apparatus for
connecting a battery plate to a metal strap or post, including a
mould having an aligned set of posts or strap cavities, a molten
metal feed duct for feeding all the cavities in the set and
extending adjacent thereto, a weir or weirs between the feed duct
and the cavities, a feed passage extending below the feed duct for
distributing molten lead to the duct and having a lead inlet
characterised in that the lead inlet location is intermediate the
ends of the set.
[0006] By feeding the lead intermediate the ends, the time lag
between filling is at once is reduced and by proper positioning of
the location the mould can be arranged such that those cavities to
one side of the location are filled in equal time with those on the
other side. Thus in a preferred embodiment the location is
positioned such that the cavities on either side of the location
are filled in at least approximately equal time.
[0007] In most arrangements, where the cavities are symmetrical
about a centre line, this will be achieved with a location which is
at least approximately equidistant, measured along the duct, from
the ends of the set. However, if the cavities are not of equal
capacity or the cross-section of the duct on one side of the
location is different to the cross-section of the duct on the other
side of the location some other position for the location may be
preferred.
[0008] It will be understood, as indicated above, that simply by
feeding intermediate the ends, a degree of improvement in terms of
filling time can be achieved over a feed duct which is fed solely
from one end.
[0009] In general the feed passage may extend generally below the
duct and may be connected to the duct by at least one passage up
which the lead can well.
[0010] The passage may allow drain back of the lead to complete a
cycle and the mould may further include at least one body disposed
in the feed duct so as to reduce the volume of that part of the
feed duct which lies between the lowest and highest level marks in
the duct for lead in a cycle.
[0011] The invention also includes a mould for use in apparatus for
connecting battery plate to a metal strap or post having the
features set out above.
[0012] From another aspect the invention includes a mould for
apparatus for connecting a battery plate to a metal strap or post,
the mould including an aligned set of post or strap cavities, a
molten metal feed duct for feeding all the cavities in the set and
extending adjacent thereto, a weir between the feed duct and the
cavities, a feed passage extending below the feed duct for
supplying molten lead to the duct and for allowing drain back of
the lead characterised in that there is at least one body disposed
in the feed duct so as to reduce the volume of the part of the feed
duct, which lies between the lowest and highest level marks in the
duct for lead in a cycle.
[0013] From a further aspect the invention consists in a mould for
connecting metal strap or posts to respective battery plates for a
plurality of batteries, the mould included aligned sets of post or
strap cavities for each battery, a molten metal feed duct for
feeding all the cavities, a lead feed for feeding lead to the feed
duct and means for adjusting localised feed into the duct to obtain
uniform cavity filling along the extent of the mould.
[0014] In any of the above cases bypass feeds may be provided along
the feed duct for selectively providing localised lead flow.
[0015] Although the invention has been defined as above, it is to
be understood it includes any inventive combination of the features
set out above or in the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The invention may be performed in various ways and a
specific embodiment will now be described, by way of example, with
reference to the accompanying drawings, in which,
[0017] FIG. 1 is a horizontal section through a mould, with the
upper part of the mould showing the arrangement described in WO
94/16466, whilst the lower half of the drawing illustrates an
embodiment of the invention;
[0018] FIG. 2 is a section along the line A-A in FIG. 1;
[0019] FIGS. 3 and 4 correspond to FIGS. 1 and 2 but include an
optional displacement bar;
[0020] FIG. 5 is a schematic cross-section through one cavity set
showing the lead low level;
[0021] FIG. 6 is the corresponding view to FIG. 5 at the highest
level lead mark; and
[0022] FIG. 7 is a plan view from above of a multiple battery mould
incorporating the bypass feeds of FIGS. 5 and 6.
DETAILED DESCRIPTION OF THE INVENTION
[0023] A mould is generally indicated at 10 and includes sets of
mould cavities 13, 14 which can be fed with lead, as described
below, by weirs, some of which are indicated at 15. The basic
construction and operation of these features is identical to that
described in British Patent No. 2023471B and the description of
that patent is incorporated into the specification for these
purpose.
[0024] In the top half (the WO 94/16466) arrangement a pair of the
passages 16, 17 are fed with a source of lead indicated to feed
respective halves of the set of moulds 13 by means of vertical
passages such as indicated at 19. As has been explained above this
can lead to a time lag between the filling of the cavities supplied
by passage 16 as compared with those supplied by passage 17.
[0025] In contrast, as shown in the lower half of FIG. 1 and the
left hand half of FIG. 2, the lead is fed from passage 16 to
passage 17 via an opening 20 positioned intermediate the ends of
the aligned cavities in the set 14. The lead is then fed both left
and right to well up passages 22 into a duct 23, that feeds the
cavities 14. As the location of opening 20 is central, the lead
will feed into the left hand cavities 14 at approximately the same
time, as it flows into the right hand cavities, with the result
that the timing of the dip of the lugs into the cavities can be
optimised without any significant difficulties.
[0026] It will be understood that this solution is particularly
efficacious.
[0027] As is generally well known moulds of this type work on what
is known as the tidal system whereby lead flows into the mould
cavities 13, 14 to a point of overflowing, normally under the
operation of a pump, and then the pump is switched off and the
excess lead in the mould drains back over the weir 15 and, mainly
under gravity, then flows back to low level or low tide mark in the
feed duct, before starting the cycle again. It is known to vary the
overall volume which may be taken by the lead by including balance
blocks, such as is indicated as 25 in FIG. 3, in order to balance
the volume which is being fed in conjunction with one set of
cavities, with the volume that is being fed in relation to another
set of cavities but these do not significantly impinge on the
volume of lead which exists between the low tide marks and the high
tide marks during the cycle. The Applicants have appreciated that
if they could reduce this latter volume, then they could
significantly reduce the cycle time, because there is less lead to
be pumped and, even more significantly, from a time point of view,
there is less lead to be drawn back.
[0028] They therefore propose to provide a displacement bar 25
which can be fitted to depend into the feed duct 23 to lie between
the low level lead mark 28 and the high level lead mark 29. As can
be seen in FIGS. 5 and 6 the bar 25 thus occupies much of the
volume between the low level and high level marks leaving the
hatched volume 30 shown in FIG. 6 as the amount which needs to flow
back towards the feed pipes 16, 17 over the weir 15.
[0029] Although the FIG. 5 structure would normally work as shown
in FIG. 4 with the feed pipe 16 feeding the feed pipe 17, as can be
seen in FIG. 5, optional connections direct from the feed pipe 16
to the duct 23, such as is shown at 16a, can be provided to locally
balance the flow into the duct 23 and hence into the locally
adjacent moulds. Conveniently connections 16a are drilled along the
length of the feed pipe 16 and then plugged as indicated in chain
line 4 at 16c. When the mould is in situ a test run is carried out
and the filling of the individual cavities is inspected. If there
is incomplete filling of any cavity then one or more adjacent plugs
16c are removed to achieve the appropriate filling profile.
[0030] The Applicants have found that the ability to tune the
localise flow lead, and in particular together with the enhanced
lead flow achieved by the intermediate main feed mentioned above,
enables them to fill simultaneously longitudinal aligned moulds for
a plurality of batteries. This will hugely increase the
productivity of any line incorporating the moulding apparatus.
[0031] FIG. 7 illustrates a mould for moulding the straps and posts
for three batteries as indicated as A, B and C.
* * * * *