U.S. patent application number 13/079325 was filed with the patent office on 2011-10-06 for apparatus for recovering pieces of paste made of active matter for plates of lead accumulators.
This patent application is currently assigned to SOVEMA S.P.A.. Invention is credited to Pietro FARINA.
Application Number | 20110240174 13/079325 |
Document ID | / |
Family ID | 42830068 |
Filed Date | 2011-10-06 |
United States Patent
Application |
20110240174 |
Kind Code |
A1 |
FARINA; Pietro |
October 6, 2011 |
APPARATUS FOR RECOVERING PIECES OF PASTE MADE OF ACTIVE MATTER FOR
PLATES OF LEAD ACCUMULATORS
Abstract
Apparatus for recovering pieces of paste made of active matter
for plates of lead accumulators, which comprises:--a first conveyor
belt wound in a loop on rollers, equipped with a first horizontal
section, adapted to receive the pieces from a spreading machine,
and with a first vertical section arranged to continue the first
horizontal section;--a second conveyor belt wound in a loop on
rollers, equipped with a second horizontal section, adapted to
transfer the pieces to the hopper of the spreading machine and with
a second substantially vertical section arranged to continue the
second horizontal section. The two vertical sections of the two
conveyor belts are arranged one on the other counterfaced to each
other, parallel to hold and transport the pieces interposed
therebetween and coming from the first horizontal section of the
first conveyor belt and are transferred to the second horizontal
section of the second conveyor belt. A third conveyor belt wound in
a loop on third rollers, is arranged substantially transverse to
the second horizontal section of the second conveyor belt and it is
suitable to receive the pieces from the latter and transfer them to
the hopper of the spreading machine.
Inventors: |
FARINA; Pietro; (Villafranca
(VR), IT) |
Assignee: |
SOVEMA S.P.A.
Villafranca (VR)
IT
|
Family ID: |
42830068 |
Appl. No.: |
13/079325 |
Filed: |
April 4, 2011 |
Current U.S.
Class: |
141/18 |
Current CPC
Class: |
Y02E 60/10 20130101;
H01M 4/20 20130101 |
Class at
Publication: |
141/18 |
International
Class: |
B65B 3/04 20060101
B65B003/04 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 2, 2010 |
IT |
PD2010A000107 |
Claims
1. Apparatus for recovering pieces of paste of active matter for
plates of lead accumulators, intended to be operatively associated
with a grid spreading machine of the type equipped with a hopper
for loading the paste, Said apparatus being characterised in that
it comprises: a support structure; at least one first conveyor belt
mounted on said support structure, wound in a loop over at least
first rollers, and equipped with a first substantially horizontal
section, suitable for receiving the pieces from said spreading
machine, and with at least one first substantially vertical
section, arranged as a continuation of said first horizontal
section; at least one second conveyor belt mounted on said support
structure, wound in a loop over at least second rollers, and
equipped with a second substantially horizontal section, suitable
for giving up the pieces, at a second end roller thereof, in
particular to a hopper of said spreading machine, and with at least
one second substantially vertical section, arranged as a
continuation of said second horizontal section; said at least first
and second vertical section, respectively of said first and second
conveyor belt, being arranged one on top of the other facing one
another, parallel to hold and transport pieces arranged between
them, at least from the first horizontal section of said first
conveyor belt up to the second horizontal section of said second
conveyor belt; at least one third conveyor belt wound in a loop on
third rollers, arranged substantially transversally to the second
horizontal section of said second conveyor belt able to receive
said pieces at a first end thereof from said second horizontal
section and give them up to the hopper of said spreading machine at
a second end thereof.
2. Apparatus for recovering pieces of paste according to claim 1,
wherein said first conveyor belt is provided with a third
horizontal section arranged as a continuation of its first vertical
section and arranged opposite, parallel on at least one portion of
the second horizontal section of said second conveyor belt to hold
and transport pieces arranged between the aforementioned second and
third horizontal section.
3. Apparatus for recovering pieces of paste according to claim 1,
wherein said second conveyor belt is provided with a fourth
horizontal section arranged as a continuation of its second
vertical section and arranged opposite, parallel on at least one
portion of the first horizontal section of said first conveyor belt
to hold and transport pieces arranged between the aforementioned
first and fourth horizontal section.
4. Apparatus for recovering pieces of paste according to claim 1,
wherein the first vertical section of said first conveyor belt and
the second vertical section of said conveyor belt are wound over a
first and second shared return roller.
5. Apparatus for recovering pieces of paste according to claim 1,
wherein said first conveyor belt is wound in a loop over first end
rollers, one upper and one lower, at least one of which is
motorised.
6. Apparatus for recovering pieces of paste according to claim 1,
wherein said first conveyor belt is wound in a loop on second end
rollers one upper and one lower, at least one of which is
motorised.
7. Apparatus for recovering pieces of paste according to claim 1,
wherein said third conveyor belt is slidingly mobile along the
transversal direction of its extension between a first position, in
which its first end is at the second upper end roller of said
second conveyor belt and a second position, in which its first end
is taken away from the second upper end roller of said second
conveyor belt.
8. Apparatus for recovering pieces of paste according to claim 1,
wherein said third conveyor belt is rotatably mobile around a
substantially vertical axis between a first position, in which said
third conveyor belt extends transversally with respect to the
second horizontal section of said second conveyor belt and a second
position, in which said third conveyor belt is arranged in an
angled position with respect to said first position.
9. Apparatus for recovering pieces of paste, according to claim 1,
wherein: the first vertical section of said first conveyor belt and
the second vertical section of said second conveyor belt are wound
on a first and a second return roller in common; said first
conveyor belt is wound in a loop on first end rollers, one of which
upper and one lower, one of which is motor driven; and said first
conveyor belt is wound in a loop with parallel paths on two first
end rollers, on said first and second return roller, and on a third
and a fourth return roller respectively arranged in the vicinity of
said first and second return roller and at the same height
respectively of said first lower end roller and first upper end
roller.
10. Apparatus for recovering pieces of paste, according to claim 1,
wherein: the first vertical section of said first conveyor belt and
the second vertical section of said second conveyor belt are wound
on a first and a second return roller in common; said first
conveyor belt is wound in a loop on second end rollers, one of
which upper and one lower, one of which at least is motor driven;
and said second conveyor belt is wound in a loop with parallel
paths on said second end rollers, on said first and second return
roller, and on a fifth and a sixth return roller respectively
arranged in the vicinity of said first and second return roller and
at the same height respectively of said second lower end roller and
second upper end roller.
Description
FIELD OF APPLICATION
[0001] The present invention concerns an apparatus for recovering
pieces of paste made of active matter for plates of lead
accumulators, according to the preamble of the main independent
claim.
[0002] The apparatus in question is intended to be used in the
industrial sector for the production of acid lead accumulators
associated to a lead grid spreading machine with a paste made of
active matter adapted for the formation of plates for electrical
accumulators.
STATE OF THE ART
[0003] The industrial system for producing lead accumulators
conventionally provide for the use of spreading machines for
distributing on one or on both the sides of lead alloy grids a
paste made of active matter generally constituted by lead oxide,
diluted sulphuric acid, water and additives.
[0004] Spreading machines, comprising a hopper for loading the
active material to be spread, stirring means mounted within the
hopper for mixing and pressing the paste, and a spreading unit
generally obtained by means of counter-rotating rollers adapted to
forcedly emit through a fissure a continuous strip of paste made of
active matter, above the grids which advance on a conveyor belt are
known in the market.
[0005] Exiting from the abovementioned conveyor belt, while the
grids are picked up, for example by a second conveyor belt, the
pieces of paste made of active matter corresponding to the space
that corresponds to the grids in succession on the conveyor belt
are conveyed externally to the spreading machine for example by
means of a chute towards a collection tank.
[0006] The pieces collected in the tank can be advantageously
reused by reintroducing them into the hopper.
[0007] The transport of such pieces, i.e. ribbons or strips of
paste made of active matter, from the exiting end of the conveyor
belt up to the hopper, is currently carried out manually or
automatically.
[0008] The manual transport of the pieces of paste made of active
matter implies considerably high staff costs and the operation is
quite laborious and complex.
[0009] The automatic transport of the pieces of paste has been
obtained up to now apparatus for recovery thereof which revealed to
be bulky and operatively poorly functional.
[0010] More in detail, a first apparatus for recovering pieces of
paste for plates of lead accumulators, provides for the use of more
inclined conveyor belts, which unload in succession one on the
other the pieces oriented along a trajectory which starts from
beneath the end of the conveyor belt and ends above the hopper.
[0011] Such apparatus, of the known type, revealed to be extremely
bulky requiring the use of several inclined conveyor belts
operatively connected in series to each other. Furthermore, the
pieces simply resting on the belts can easily fall, in particular
at the jumps between a belt and the other.
[0012] A second apparatus provides for picking up, with an auger
operating intermittently, the pieces that accumulate in preset time
intervals in the collection tank, and transferring them by means of
several augers in succession, only one of which vertical, up to the
loading opening of the hopper.
[0013] This apparatus revealed to be expensive to construct and
operatively unsuitable for the transport of the pieces of paste
made of active matter. Actually, the latter should maintain, during
transport, the original density thereof so as to avoid creating
problems related to uniformity and composition within the hopper.
Otherwise, the abovementioned augers compact the paste during
transport varying the density thereof and hence immediately emit
into the hopper, at each operating period thereof, particularly
compact and thick cords of paste which then require compensation
with special dilutions into the hopper making the system extremely
complex and difficult to control.
SPECIFICATION OF THE INVENTION
[0014] In this situation, the problem on which the present
invention is based is that of overcoming the drawbacks revealed by
the solutions of the prior art, by providing an apparatus for
recovering pieces of paste made of active matter for plates of lead
accumulators, capable of allowing an ideal transport of such pieces
up to the opening of the a hopper of a spreading machine.
[0015] A further object of the present invention is that of
providing an apparatus for recovering pieces of paste made of
active matter for plates of lead accumulators, which allows
transporting the abovementioned pieces substantially without
modifying the density thereof.
[0016] Another object of the present invention is to provide an
apparatus for recovering pieces of paste made of active matter,
requiring small overall dimensions.
[0017] Another object of the present invention is to provide an
apparatus for recovering pieces of paste made of active matter,
capable of continuously supplying the hopper of a spreading
machine.
[0018] Another object of the present invention is to provide an
apparatus for recovering pieces of paste made of active matter,
capable of transporting the pieces without losses.
[0019] A further object of the present invention is to provide an
apparatus for recovering pieces of paste made of active matter,
which is economically easy to construct and operatively entirely
reliable.
[0020] The apparatus for recovering pieces of paste made of active
matter, according to the present invention allows attaining the
advantage of automatically recovering the pieces of a spreading
machine without altering the characteristics thereof for a complete
and immediate use.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The technical characteristics of the invention, according to
the abovementioned objects, are clearly observable from the
contents of the claims outlined hereinafter and the advantages
thereof shall be more apparent from the detailed description that
follows, provided with reference to the attached drawings, which
represent some embodiments thereof provided purely by way of
example, wherein:
[0022] FIG. 1 shows a first perspective view of the apparatus for
recovering pieces of paste made of active matter, subject of the
present invention;
[0023] FIG. 2 shows a second perspective view of the apparatus
subject of the present invention, operatively associated to a
spreading machine;
[0024] FIG. 3 shows a rear view of the apparatus subject of the
present invention, operatively associated to the spreading
machine;
[0025] FIG. 4 shows a plan view of the apparatus subject of the
present invention, operatively associated to the spreading
machine;
[0026] FIG. 5 shows a front view of the apparatus subject of the
present invention, operatively associated to the spreading machine,
with some parts removed to better reveal the others;
[0027] FIG. 6 shows a cross-sectional perspective view carried out
according to a median longitudinal plane of the apparatus subject
of the present invention;
[0028] FIG. 7 shows a rear view of a variant embodiment of the
apparatus subject of the present invention;
[0029] FIG. 8 shows a plan view of the apparatus of FIG. 7 with
some parts removed to reveal the others better,
[0030] FIG. 9 shows a perspective view of a front portion of the
apparatus of FIG. 7;
[0031] FIG. 10 shows a perspective view of the apparatus of FIG.
7.
[0032] FIG. 11 shows a cross-sectional lateral view carried out
according to a median longitudinal plane of the apparatus of FIG.
7.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
[0033] With reference to the attached drawings an apparatus for
recovering pieces of paste made of active matter for plates of lead
accumulators, subject of the present invention was indicated in its
entirety with 1.
[0034] The abovementioned apparatus 1 for recovering pieces of
paste made of active matter for plates of lead accumulators, e
intended to be operatively associated to a grid spreading machine
2. The grids, once spread with the paste made of active matter on
one side or on both sides, form plates for the accumulators.
[0035] The apparatus 1 is generally suitable to be used for
recovering the pieces of paste made of active matter from any
spreading machine 2, which requires picking up the pieces at an
outlet section of the machine, in which the formed plates normally
leave a conveyor belt, and take them to an inlet station of the
paste, which usually and according to the embodiment illustrated in
the attached figures is obtained with a hopper 3 for loading the
paste.
[0036] More in detail, the spreading machine illustrated in the
attached figures comprises a bearing structure 4 on which there is
mounted a hopper 3 for loading the active material to be spread.
Within the hopper 3 there are provided stirring means (not
illustrated) for mixing and pressing the paste. In the lower part
of the hopper 3 there is mounted a spreading unit, of the per se
known type, which is generally obtained by means of two
counter-rotating rollers (or similar systems) adapted to forcedly
emit through a fissure a paste strip which is laterally limited in
a precise width by means of special templates.
[0037] The machine 2 also comprises at least one driven conveyor
belt 5, on which the grids to be spread rest horizontally in
succession spaced from each other and preferably coupled laterally
two by two. The conveyor belt 5 is provided, in at least one
central section thereof, beneath the hopper to take the grids to
transit beneath the fissure at the spreading unit. Special
calibrating and finishing are provided downstream of the fissure
for compressing the layer of paste uniformly in the meshes of the
alloy lead grids.
[0038] At such spreading unit, the paste is conveyed pressurized
into the meshes of the grids remaining delimited between the
templates within the lateral dimension of the frame of the grids in
question. The single grids of the succession that advances on the
conveyor belt are, as mentioned, separated from each other by means
of a spacer gap, whose function is that of preventing the grids
from being misaligned on the belt by touching each other, for
example due to stresses to which they are subjected when passing
beneath the conveying or calibrating rollers i.e. in the passage
through the spreading unit.
[0039] Also the abovementioned spacer gaps provided for between the
grids are thus covered by the continuous strip which is emitted by
the fissure of the hopper. The calibrating and finishing rollers,
arranged downstream of the spreading zone, substantially determine
the cutting--by compressing the upper surface of the grids--of the
paste strip at the front and rear edges of each grid with the
ensuing formation of the pieces in form ribbons of paste. The
latter are thus arranged on the belt at the interspaces between the
grids, i.e. before and after each grid, with respect to the
direction of advancement X thereof on the conveyor belt 5.
[0040] Exiting from the abovementioned conveyor belt 5, while the
grids are picked up for example by a second conveyor belt, the
ribbons of paste made of active matter are detached from the belt 5
by means of a scraper and externally conveyed to the machine 2 for
recovery thereof.
[0041] The spreading machine 2 can be easily adapted to spread
grades of various shapes by replacing the templates for conveying
the paste. Such operation requires previously lifting the hopper 3
to uncover the templates. The lifting of the hopper 3 is for
example obtained by actuating a first hydraulic actuator 6, aimed
at inclining one side of the hopper 3, which is, for such purpose,
hinged to the base along one side thereof. After lifting the hopper
3 the templates can be replaced with other different dimensions
before closing the hopper 3 again by actuating the first hydraulic
actuator 6.
[0042] The pieces are thus in form of small ribbons of a paste
generally containing lead oxides, diluted sulphuric acid, water and
additives.
[0043] The apparatus 1 for recovering the pieces, subject of the
present invention, comprises a support structure 7, which is
intended to rest on the ground advantageously by means of wheels 13
for facilitating transport thereof, and it is substantially
C-shaped, as easily observable from the attached FIGS. 6 and
11.
[0044] Two conveyor belts, respectively a first conveyor belt 8 and
a second conveyor belt 9, which are wound in a loop on respective
first and second rollers to be specified hereinafter are mounted on
the support structure 7.
[0045] The first conveyor belt 8 is equipped with a first
substantially horizontal section 10, which receives the pieces from
the spreading machine 2, and with a first substantially vertical
section 11 arranged to continue the first horizontal section
thereof.
[0046] The second conveyor belt 9 is in turn equipped with a second
substantially horizontal section 12, adapted to transfer the
pieces, at a second end roller 25 thereof, and with a second
substantially vertical section 14 arranged to continue the second
horizontal section 12.
[0047] The horizontal sections 10 and 12 develop in preferably
parallel directions indicated in the figures with Z and Z'.
[0048] The two vertical sections 11, 14 of the two conveyor belts
8, 9 are arranged one on the other counterfaced and parallel with
respect to each other. They advance at the same speed so as to hold
interposed, between the respective counterfaced surfaces, the
pieces, taking them from the first horizontal section 10 of the
first conveyor belt 8 and taking them to the second horizontal
section 12 of the second conveyor belt 9.
[0049] According to the idea on which the present invention is
based, the pieces are thus continuously taken from the first
conveyor belt 8 as they fall from the belt 5 of the spreading
machine 2, thus preventing dangerous accumulation thereof for the
transport possibilities thereof. Furthermore, upon leaving the
abovementioned first horizontal section 10 of the first conveyor
belt 8, the pieces are taken over, without the possibility of
falling, between the two vertical sections of the two belts 8, 9
that lift them to take them back substantially to the height of the
opening for loading the hopper 3.
[0050] The abovementioned first and second vertical section 11 and
14 of the two conveyor belts 8 and 9 are wound on two return
rollers in common, one of which is lower 18 and one is upper
19.
[0051] Thus, the apparatus 1 according to the invention provides
for a third conveyor belt 15 wound in a loop on third rollers,
arranged substantially transverse to the second horizontal section
12 of the second conveyor belt 9. The latter receive the pieces, in
particular at a first end 16 thereof i.e. in a median section
thereof, from the abovementioned second horizontal section 12 and
transfers them to the hopper 3 of the spreading machine 2 at the
second end 17 thereof.
[0052] Preferably, according to an embodiment illustrated in the
attached figures the two conveyor belts 8 and 9 develop, on all
respective sides, parallel to each other so as to minimize the
overall dimensions of the apparatus 1.
[0053] More in detail, the first conveyor belt 8 is wound in a
loop, maintaining the belt on two parallel paths, on two first end
rollers, one of which lower 20 and one upper 21, on the
abovementioned first and second return roller 18, 19, and on a
third and a fourth return roller 22, 23 arranged in the vicinity,
and at the height, respectively of the first 18 and of the second
19 return roller.
[0054] The second conveyor belt 8 9 is in turn wound in a loop,
maintaining the belt on two parallel paths, on two second end
rollers, one of which lower 24 and one upper 25, on the
abovementioned first and second return roller 18, 19, and on a
fifth and a sixth return roller 26, 27 arranged in the vicinity,
and at the height, respectively of the first 18 and of the second
19 return roller.
[0055] According to the embodiment illustrated in the attached
FIGS. 1-6 the two belts 8 and 9 are rotated at the same speed each
by a respective motor driven roller, i.e. respectively by the first
upper end roller 21 and by the second upper end roller 25,
respectively by means of a first motor M1 and a second motor M2
with respective reduction gears.
[0056] Otherwise, according to the embodiment illustrated in the
attached FIGS. 7-11, only one of the two abovementioned rollers may
be driven by a motor M12, the other being rotated by the first by
means of simple return means obtained for example through flexible
transmission means such as a belt.
[0057] Preferably, the third conveyor belt 15 is wound in a loop
between two third end rollers 32, 33, respectively arranged at the
first and the second end of the third conveyor belt 15, and mounted
on a framework 34 mechanically connected cantilevered to a column
7' of the of the bearing structure 7 of the apparatus 1.
[0058] The motorisation of the abovementioned third conveyor belt
15 is preferably provided mechanically independent from the one
provided for the other two belts 8, 9, for example through a third
motor M3 connected to the end roller 32 nearest to the first end 16
of the third conveyor belt 15 which receives the pieces.
[0059] For a better taking over of the pieces between the two belts
8, 9 in the vertical section, as indicated previously, the belts
shall also be superimposed even in a portion of the horizontal
sections thereof.
[0060] More in particular, the first conveyor belt 8 is preferably
provided with a third horizontal section 28, arranged to continue
the first vertical section 11 thereof, and arranged counterfaced
parallel on at least one first portion 29 of the second horizontal
section 12 of the second conveyor belt 9 to hold and transport the
pieces interposed between the abovementioned second and third
horizontal section 28, 29. The latter superimposition of the
horizontal layers 12, 28 of the two belts 8, 9 is obtained without
interruption with the superimposition of the vertical layers 11, 14
so as to provide a continuous guide for the transport of the
pieces.
[0061] Furthermore, the second conveyor belt 9 may also be provided
with a fourth horizontal section 30, arranged to continue the
second vertical section 14 thereof, and arranged counterfaced,
parallel on at least one second portion 31 of the first horizontal
section 10 of the first conveyor belt 8 to hold and transport
pieces interposed between the abovementioned first and fourth
horizontal section 10, 30. The latter superimposition of the
horizontal layers 10, 30 of the two belts 8, 9 is obtained without
interruption with the superimposition of the vertical layers 11, 14
so as to provide a continuous guide for the transporting
pieces.
[0062] The remaining portions of the two belts 8, 9 are not
returned and described in detail and they are advantageously
arranged parallel to each other in the respective paths as clearly
represented in the attached FIG. 4.
[0063] According to the embodiment of FIGS. 1-6, the framework 34
of the third conveyor belt 15 is supported cantilevered on the
support structure 7 by means of a projecting arm 35.
[0064] Otherwise and preferably, the framework 34 of the third
conveyor belt 15 is supported beneath the second horizontal section
12 of the second conveyor belt 9 by the support structure 7 of the
apparatus.
[0065] According to an advantageous characteristic of the apparatus
1 subject of the present invention and illustrated in FIGS. 7-11,
the third conveyor belt 15 is slidably supported by means of guides
60, fixed to a support framework 61 of the support structure 7, so
as to be displaced by means of a second actuator 62 along the
direction of development and advancement of the third conveyor belt
15. Thus, the third conveyor belt 15 may be associated or not
associated to the second end 17 thereof for releasing the pieces
with respect to the opening for loading the hopper 3 of the
spreading machine 2. The guides 60, in particular, are engaged in a
track 65 projecting from the framework 34.
[0066] More in detail, the third conveyor belt 15 is guided
supported along the transverse direction of development Y thereof
between a first position, in which the first end 16 is at the
second upper end roller 25 of the second conveyor belt 9, and a
second position, in which the first end 16 thereof is away from the
second upper end roller 25 of the second conveyor belt 9.
[0067] Such movement allows lifting the hopper 3 of the spreading
machine 2 (even solely folded on one side), to allow performing the
maintenance operations to allow the replacement of the templates so
as to adapt the spreading machine 2, to spread grids of a different
shape.
[0068] Otherwise, according to the embodiment illustrated in FIGS.
1-7, the third conveyor belt can be easily displaced around an axis
to vary the position of the second end 17 thereof with respect to
the hopper 3. For such purpose, the projecting arm 35 of the
framework of the third conveyor belt 15 is connected to the column
7' of the bearing structure 7 of the apparatus 1 by means of a
hinge 36. For such purpose, a third actuator (not illustrated)
mounted on the support structure 7 of the apparatus 1 is suitable
to operate on the abovementioned arm 35 to rotate it between a
first position, in which the third conveyor belt 15 is extended
transverse with respect to the second horizontal section 12 of the
second conveyor belt 9 and a second position, in which the third
conveyor belt 15 is arranged at an angled position with respect to
the first position thereof.
[0069] In order to facilitate the detachment of the pieces of paste
from the conveyor belts 8, 9, scraper means 40, constituted for
example by the inclined blades fixed to the support structure 7,
and elastically resting on the surface of the belts to facilitate
the detachment of the pieces from the corresponding folds of the
belt, are provided for.
[0070] Such scraper means 40 are preferably provided for at the
ends for releasing the pieces of the second horizontal section 12
of the second conveyor belt 9, i.e. also at the end of the first
superimposition portion 29 between the second horizontal section 12
of the second belt 9 and the third horizontal section of the first
belt 8.
[0071] Furthermore, such scraper means 40 may also be provided for
at the outlet end of the conveyor belt 5 of the spreading machine 2
i.e. at the second end 17 of the third conveyor belt 15.
[0072] Hence, the invention thus conceived attains the preset
objects.
[0073] Hence, the device thus conceived attains the preset
objects.
[0074] Obviously, the shape and configurations of the invention may
vary in the practical embodiment thereof with respect to those
illustrated above without departing from the scope of
protection.
[0075] Furthermore, all the details may be replaced by technically
equivalent elements and the dimensions, shapes and materials used
may vary according to the requirements.
* * * * *