U.S. patent application number 16/265125 was filed with the patent office on 2019-08-08 for bag-lined spring core with monolithic perimeter, and reinforced and stabilized edges.
The applicant listed for this patent is INDUSTRIAS SPUM, S.A. DE C.V. Invention is credited to Leon Blanga Cohen.
Application Number | 20190239654 16/265125 |
Document ID | / |
Family ID | 67475242 |
Filed Date | 2019-08-08 |
View All Diagrams
United States Patent
Application |
20190239654 |
Kind Code |
A1 |
Cohen; Leon Blanga |
August 8, 2019 |
BAG-LINED SPRING CORE WITH MONOLITHIC PERIMETER, AND REINFORCED AND
STABILIZED EDGES
Abstract
A core of springs with monolithic perimeter frame and reinforced
and stabilized edges, of the type used for the manufacture of seats
for furniture or mattresses, which is comprised of: an arrangement
of springs that can be manufactured from independent bag-lined
cylindrical springs; and a layer of support material or bottom on
which the arrangement of springs is arranged, the dimensions in
length and width of said layer of support material being greater
than those of the arrangement of springs, thereby generating a
surplus of material around the arrangement of springs that
supports, which is characterized in that; a monolithic perimeter
frame of foamed material made in situ on the surplus material of
the support layer, surrounds and reinforces the arrangement of
springs, so that said perimeter frame is firmly joined as part of
the chemical reaction of its foaming and adhesion process.
Inventors: |
Cohen; Leon Blanga; (Mexico
City, MX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
INDUSTRIAS SPUM, S.A. DE C.V |
LERMA DE VILLADA |
|
MX |
|
|
Family ID: |
67475242 |
Appl. No.: |
16/265125 |
Filed: |
February 1, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47C 27/066 20130101;
A47C 23/0438 20130101; A47C 7/20 20130101; A47C 7/342 20130101;
A47C 27/064 20130101; A47C 7/35 20130101 |
International
Class: |
A47C 23/043 20060101
A47C023/043; A47C 7/34 20060101 A47C007/34; A47C 7/20 20060101
A47C007/20; A47C 7/35 20060101 A47C007/35 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 2, 2018 |
MX |
MX/U/2018/000062 |
Claims
1. A core of springs with monolithic perimeter frame and reinforced
and stabilized edges, of the type used for the manufacture of seats
for furniture or mattresses, comprising: an arrangement of
independent bag-lined cylindrical springs; and a layer of support
material or bottom on which the arrangement of springs is arranged,
being the dimensions in length and width of said layer of support
material greater than those of the arrangement of springs, thereby
generating a surplus of material around the arrangement of springs
that supports, which is characterized in that; a monolithic
perimeter frame of foamed material made in situ on the surplus
material of the support layer, surrounds and reinforces the
arrangement of springs, so that said perimeter frame is firmly
joined as part of the chemical reaction of its foaming and adhesion
process both to the support material and to each of the bags
containing the peripheral springs of the core, wherein said
perimeter frame also penetrates each of the empty spaces defined
between each of the bags containing the peripheral springs of the
arrangement of springs.
2. The core of springs with monolithic perimeter frame and
reinforced and stabilized edges, as claimed in claim 1,
characterized in that; the monolithic perimeter frame surrounds
each of the bags containing the peripheral springs in at least a
portion close to 50% of its circumference.
3. The core of springs with monolithic perimeter frame and
reinforced and stabilized edges, as claimed in claim 1,
characterized in that; the monolithic perimeter frame surrounds
each of the bags that contain the corner springs of the arrangement
of springs in at least a portion close to 75% of its
circumference.
4. The core of springs with monolithic perimeter frame and
reinforced and stabilized edges, as claimed in claim 1,
characterized in that; the foaming material with which the
monolithic perimeter frame is built in situ results, but is not
limited to, a mixture for flexible polyurethane foam.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application takes the benefit of and claims priority
from Mexican Patent Application Serial No. MX/u/2018/000062 filed
on Feb. 2, 2018, the contents of which are herein incorporated by
reference.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present utility model is comprised within the field of
spring cores composed of a plurality of bag-lined springs used in
the manufacture of seats for furniture and mattresses, and in
particular, it is related to a bag-lined spring core with
reinforced and stabilized edges.
Description of the Related Art
[0003] Various proposals are known to date to increase the
structural strength of the terminal ends of a structure or core of
springs, the foregoing, because experience has shown that the
continuous use of a seat or mattress integrated from said
structures or cores of springs quickly deforms the perimeter zone
of the seat or mattress in use, a condition that reduces its useful
life, even though, in its central part, the aforesaid seat or
mattress has optimal conditions of use.
[0004] Example of the proposals currently known to prevent
premature deformation of the springs arranged in the periphery,
either of a structure or core of springs that integrates a seat or
mattress, is found in the following documents.
[0005] U.S. Pat. No. 5,133,116 issued Jul. 28, 1992, wherein,
Robert F. Wagner, disclosed a method for reinforcing and
stabilizing an edge of spring, in particular, using a continuous
length of elastic cord or strap wedged between turns of adjacent
springs, a plurality of turns of said elastic cord or strap having
around the perimeter of the set of springs.
[0006] In the patent MX 215,110 granted on Jul. 8, 2003 to Ohio
Mattress Company Licensing and Components Group, under the title
"Internal mattress wall structures interlocked with the assembly of
internal springs of the mattress", an Invention was unveiled.
Refers to an internally enclosed mattress wall structure engaged
with coils of an internal mattress springs assembly to serve as an
internal elastic structural component of a mattress, the wall
structure characterized in that it comprises: a main body section
having a generally flat wall surface, upper and lower surfaces
intersecting the wall surface, a series of parallel flanges
extending laterally of the main body section away from the wall
surface and adapted to be inserted between the turns of the
perimeter spirals of a assembly of internal springs, each of the
tabs it is spaced apart from the adjacent flanges and has end
sections adapted for mechanical engagement with the turns of the
perimeter spirals of an internal spring assembly, an edge rising
from the upper and lower surfaces to a point laterally inward of
the surfaces of wall, the flat wall surface of the wall structure
is adapted to be placed at a perimeter of an assembly of internal
springs wherein the edge of the upper and lower surfaces of the
main body is positioned and adapted to be partially overlapped by
spirals of an assembly of internal mattress springs such that the
edge is positioned inwardly of an outer extension of the perimeter
spirals, and the wall surface is adapted to extend at least from
the upper part of the assembly of internal springs to the lower
part of the assembly of internal springs to serve as a structural
wall of a mattress.
[0007] In U.S. Pat. No. 5,210,890 dated May 18, 1993, John E.
Hagglund disclosed a mattress base including upper and lower frame
sections that are elastically interconnected and supported by a
combination of springs and foam. In different embodiments of this
invention, the springs are of the type: helical, torsional, torsion
spring modules or a combination thereof. In another embodiment, the
foam comprises an elongated piece of foam that extends peripherally
around the base and wraps or coats the springs. The foam is
softened in a pattern to receive portions of the springs.
Alternatively, the foam comprises discrete blocks of foam spaced
around the periphery of the base and between select pairs of
adjacent springs.
[0008] U.S. Pat. No. 3,822,426 dated Jul. 9, 1974, owned by Sealy
Incorporated, disclosed an upper pad and edge stabilizer for
interior mattress springs units, comprising a unitary member of
resilient material having a pad portion of mattress cover, and a
portion of edge stabilizer. The upper pad portion covers the top or
bottom of the spring unit. The edge stabilizer portion is inserted
between at least one turn of each spring in the outer row of the
spring unit to harden the action of said spring. In one embodiment
of this invention, the edge stabilizer portion is preformed into
the position it will assume on the mattress. In a second
embodiment, the edge stabilizer portion is formed such that it must
be bent 90.degree. to be in the position it will assume on the
mattress.
[0009] And finally, in the patent MX 352,312B dated Nov. 17, 2017,
immediate antecedent of the utility model object of the present
description, it is disclosed and protected in favor of Industrias
Spum S.A. de C.V., a core of springs with monolithic perimeter
frame, which is comprised of: an arrangement of springs; a band of
retention and insulation that surrounds the arrangement of springs
whose height is coincident with that of the arrangement and which
prevents the foam material with which the monolithic perimeter
frame is built in situ from penetrating into the interior of said
arrangement of springs.
[0010] Further details of the protected invention of the patent
MX352,312B will be presented in the detailed description section of
the invention, the foregoing, in order to make it evident that the
present utility model results from a technical modification of said
invention, modification that brings with it substantial
improvements in strength and stability at the edges of a core of
springs with a monolithic perimeter frame.
[0011] As it is possible to warn of the teachings that arise from
the state of the aforementioned technique, are various proposals
that over time have sought to increase the structural strength of
the edges of a core springs used to make mattresses or other types
of seats for furniture, however, the current known proposals refer
to a mechanical connection between the peripheral springs of an
arrangement of springs and an independent material such as elastic
belts, or a structure of foamed material previously formed and
incorporated as an additional element to the core or structure from
which you want to integrate a mattress.
[0012] Unlike the known proposals, the present utility model
achieves through a modification in the structure of the invention
protected in the patent MX352,312B, integrating as the same
elements the bag-lined perimetral springs of the core of springs;
and the monolithic perimeter frame formed in situ, thus giving rise
to a "pocket spring core with monolithic perimeter frame and
reinforced and stabilized edges", with which the following are
intended:
SUMMARY OF THE INVENTION
[0013] An object of the present invention is to provide a bag-lined
spring core with reinforced and stabilized edges.
[0014] Another object of the present invention is to provide a
bag-lined spring core with a monolithic perimeter frame.
[0015] Another object of the present invention is to provide a
bag-lined spring core with a monolithic perimeter frame and
reinforced and stabilized edges used in the manufacture of
furniture or mattress seats.
[0016] Another objective of the present invention is to provide a
bag-lined spring core with a monolithic perimeter frame and
reinforced and stabilized edges, wherein said monolithic perimeter
frame is made in situ from a foaming material.
[0017] Another objective of the present invention is to provide a
bag-lined spring core with a monolithic perimeter frame and
reinforced and stabilized edges, wherein said monolithic perimeter
frame made of foaming material is attached to each of the bags
containing the peripheral springs of the core, circumscribing them
in at least a portion close to 50% of their circumference.
[0018] Another objective of the present invention is to provide a
bag-lined spring core with a monolithic perimeter frame and
reinforced and stabilized edges, wherein the union of the
monolithic perimeter frame and each of the bags containing the
peripheral springs of the core is achieved in a during the process
of foaming and drying the foaming material with which said
perimeter frame is formed.
[0019] Still another object of the present invention is to provide
a bag-lined spring core with a monolithic perimeter frame and
reinforced and stabilized edges, wherein the union of the
monolithic perimeter frame and each of the bags containing the
peripheral springs of the core allows to increase the resistance of
the terminal ends of the springs core, to reduce the deformation
effects that are generated with the continuous arrangement of loads
on them, thus extending the useful life of furniture or mattresses
manufactured from the proposed core.
[0020] The aforementioned objectives and others not mentioned, as
well as the characteristic aspects and advantages of the proposed
utility model, will be evident from the description and the figures
that accompany it with an illustrative and non-limiting character,
and that are presented below.
BRIEF DESCRIPTION OF THE FIGURES
[0021] FIG. 1 shows a conventional perspective of a core of springs
with monolithic perimeter frame used in the manufacture of seats
for furniture or mattresses, made in accordance with the invention
protected in the patent MX352,312B;
[0022] FIG. 2 shows a conventional perspective of an array of
bag-lined independent springs which forms an integral part of the
protected invention in the patent MX352,312B, and which also forms
an integral part of the present utility model;
[0023] FIG. 3 shows a conventional perspective of an arrangement of
three sealable bags joined together, from which the springs
integrating the arrangement of springs of FIG. 2 are pocketed;
[0024] FIG. 4 shows a conventional perspective of an arrangement of
three springs bag-lined in sealed bags joined together, from which
the spring arrangement of FIG. 2 is integrated;
[0025] FIG. 5 shows a conventional perspective of an arrangement of
independent bag-lined springs that forms an integral part of the
protected invention in the patent MX352.312B, where it is possible
to appreciate a retention and isolation band that surrounds the
arrangement of springs, and a layer of support material or
background;
[0026] FIG. 6 shows a conventional perspective of the arrangement
of springs of FIG. 5, when said arrangement is arranged on the
layer of support material or background;
[0027] FIG. 7 shows a top plan view of the spring core of the
invention protected in the patent MX352.312B;
[0028] FIG. 8 shows a conventional perspective of an arrangement of
independent bag-lined springs disposed on a layer of support
material or background, both elements forming an integral part of
the proposed invention.
[0029] FIG. 9 shows a conventional perspective of a bag-lined
spring core with monolithic perimeter frame and reinforced and
stabilized edges, made in accordance with the present
invention;
[0030] FIG. 10 shows a conventional perspective illustrating in
detail section "A" of FIG. 9;
[0031] FIG. 11 shows a top plan view of the bag-lined spring core
with monolithic perimeter frame and reinforced and stabilized edges
of FIG. 9;
[0032] FIG. 12 shows a top plan view illustrating in detail section
"B" of FIG. 11;
[0033] FIG. 13 shows a front elevation view of a section of the
bag-lined spring core with monolithic perimeter frame and
reinforced and stabilized edges of FIG. 9, where the arrangement of
a loading press in its upper position is appreciated, press to from
which tests of pressure and deformation were carried out at the
edges of the core; Y
[0034] FIG. 14 shows a front elevation view of a core section of
bag-lined springs with monolithic perimeter frame and reinforced
and stabilized edges of FIG. 9, wherein the arrangement of the
loading press in its lower position is seen.
DETAILED DESCRIPTION OF THE SEVERAL EMBODIMENTS
[0035] As mentioned above, the present utility model is the result
of a structural modification in the configuration of the invention
protected in the patent MX352,312B, modification that results in
substantial improvements in strength and stability at the edges of
a core of springs with monolithic perimeter frame, a condition that
is achieved from the joint work of two elements that integrate said
core springs, namely: the peripheral bag-lined springs of the core
of springs; and a monolithic perimeter frame formed in situ. The
integration of both elements into one is achieved when the foaming
material from which the monolithic perimeter frame is formed
in-situ adheres to each of the bags containing the springs that
together define the periphery of the spring core.
[0036] In this order of ideas, prior to describing the technical
characteristics that together define the proposed utility model, a
brief description of the protected invention in the following is
disclosed below and based on what is illustrated in FIGS. 1 to 7,
referred to Mexican patent, property of applicant requesting the
present registration of the present utility model.
[0037] The invention described, illustrated and protected in the
patent MX352,312B, consists of a core of springs with monolithic
perimeter frame 100 used in the manufacture of seats for furniture
or mattresses, which is comprised of: an arrangement of springs 10,
a band of retention and insulation 30 made of woven or non-woven
fabric or similar material surrounding the arrangement of springs
10 and whose height is coincident with that of the arrangement; a
layer of support or bottom material 20 on which the arrangement of
springs 10 is arranged and a surface 22 is defined on which a
perimeter frame rests; and a monolithic perimeter frame 40 made in
situ of foaming material which surrounds and reinforces the
arrangement of springs 10 which is firmly attached as part of the
chemical reaction of its foaming process and adhesion to both the
support material 20 and the retaining band and insulation 30.
[0038] In one embodiment of this Mexican patent, it has been
defined that the arrangement of springs 10 can be made from
bag-lined independent springs as shown in FIGS. 2, 3 and 4, where
each of the springs 12 that defines the arrangement 10, is placed
inside a sealable bag 14 which in turn is attached to other
sealable bags 14 by means of an adhesive, or by a seam, or even by
electronic sealing, and in this embodiment of the invention, the
shape, separation and dimensions of the arrangement of springs 10,
obeys in its entirety to the predefined itself for the arrangement
of bags 14 that contain them, this being the same as the dimensions
of length, width and height of the measurements of the furniture
seat or mattress that you want to manufacture. The bags 14 used to
introduce each of the springs 12 of the arrangement 10 are
preferably made of woven or non-woven fabric, but may be
constructed from a variety of other materials, including, but not
limited to, paper, plastic, or other materials flexible permeable
or waterproof.
[0039] In the embodiment of the arrangement of springs 10 made from
independent bag-lined springs 12, each of the springs 12 which are
preferably of the cylindrical type, is separated from the other
springs 12 of the arrangement at a uniform distance, however, in
other embodiments of this invention, it is established that the
springs 12 can be arranged in arrangements of irregular
separations, for example, if a variation in the amount of the
support is desired through the surface of the furniture or mattress
seat that is manufactured.
[0040] From the illustrated details in FIGS. 3 and 4, it is
possible to see three sealable bags 14 joined together, of the type
that are preferably used in the invention protected by the patent
MX352,312B for bagging inside to each of the springs 12 that as a
whole, define the arrangement of springs 10, wherein, each of the
sealable bags 14 are joined together to form a desired array of
sealable bags 14 by means of a thermal adhesive 16 which is applied
over the joint flanges 15 which form an integral part of each of
said sealable bags 14. Although it should be kept in mind that as
previously indicated, the connection can be by means of a seam, or
even by electronic sealing.
[0041] In the core of springs with monolithic perimeter frame 100
of the Mexican patent, the retaining band 30 that surrounds the
arrangement of springs 10, allows on the one hand, to preserve the
alignment and arrangement previously determined for said
arrangement 10, and on the other hand, preventing the foaming
material with which the monolithic perimeter frame 40 surrounding
and reinforcing said arrangement 10 is built in situ, penetrates
and undesirably solidifies in the empty spaces defined between the
bag-lined springs 12, reason why which band 30 is made of woven or
nonwoven materials similar to those referred to above for the
sealable bags 14, with the particularity that preferably
impermeable materials are used in it.
[0042] The monolithic perimeter frame 40 made of foam material
which surrounds and reinforces the arrangement of bag-lined springs
10, is formed in situ on the surface 22 defining the surplus
material of the support layer 20 and around the arrangement of
springs 10, having as penetration barrier towards said arrangement
of springs 10 to the retaining and insulating band 30, and as a
result of a chemical reaction of the foaming material from which it
is manufactured, said perimeter frame 40 adheres firmly to both the
surface 22 of the material of support 20 as to the retaining band
30, and in the case of using the retention and isolation band 30
with a plurality of holes 31, to the bags 14 containing all the
peripheral springs 12 of the spring arrangement 10. In the same
patent, it is noted that the penetration of the foaming material
through the holes 31 of the retaining and insulation band 30
towards the bags 14 of the peripheral springs 12 is minimal and
barely sufficient to join the foaming material with said bags
14.
[0043] The patent MX352,312B also protects a process for
manufacturing the core of springs with monolithic perimeter frame
100, which is perfected from an injection mold or emptying capable
of housing inside a semi-determined core of springs with the
dimensions and proper forms of length, width and height of a
furniture and mattress seat that is required to satisfy a specific
need, wherein, said mold comprises arranged around its periphery
various sectioned lid elements that from a movement of turning
allow to define an open mold or closed mold position, so that
elements such as staples, presses or clamps allow to ensure the
closed mold position, in the understanding that the release or
withdrawal of said elements allows transit to the position of open
mold by freely rotating the lid elements; process that generally
comprises the following stages:
[0044] a) surrounding a spring arrangement previously made with a
retaining band and insulation whose height is coincident with that
of the arrangement of springs and on which are configured a
plurality of holes, through which a foaming material with which a
perimeter frame is able to penetrate the band in the direction of
the arrangement of springs,
[0045] b) arranging the arrangement of springs surrounded by the
retaining band and insulation on a layer of support material inside
the injection or casting mold;
[0046] c) injecting through a mixing nozzle and injector foaming
material, or manually empty a mixture for flexible foam
polyurethane or any other foaming material desired to the interior
of the mold for injection or emptying in the space comprised
between the retaining band and insulation surrounding the
arrangement of springs and the side walls of said mold;
[0047] d) rotating the various sectioned lid elements of the
injection or casting mold from its open mold position to that of
closed mold once the injection or emptying of stage c) has been
performed on each section corresponding to one of the various
elements of injection mold cap or emptying;
[0048] e) securing the closed mold position in each of the various
lid elements from the elements that allow securing this position,
such as staples, presses or clamps;
[0049] f) wait long enough for the liquid foam injected or emptied
to cure and convert to the solid state, thus forming the monolithic
reinforcing perimeter around the arrangement of springs that has
been obtained from the previous stages;
[0050] g) releasing or removing the elements that allow to ensure
the closed mold position;
[0051] h) rotating the various sectioned lid elements of the
injection or emptying mold from its closed mold position to that of
open mold;
[0052] and
[0053] i) removing the spring arrangement from the inside of the
injection or emptying mold, which is now attached to a monolithic
reinforcement perimeter frame.
[0054] From the above information and the one that can be seen from
the Mexican patent of reference, it is possible to notice that in
the invention protected in it, with the retaining band and
insulation 30 it is sought to prevent from penetrating into the
arrangement of springs 10 the foaming material with which the
monolithic perimeter frame 40 is built in situ, that is, in the
invention known today, the contact of the foaming material
surrounding and reinforcing the arrangement of springs 10 is
limited both to the support material 20 and to the retention and
insulation band 30, a condition that technically implies an
independent operation of both the monolithic perimeter frame 40 and
the arrangement of springs 10 contained therein.
[0055] The technical contribution of the present utility model,
consists of achieving a joint operation of the arrangement of
springs 10 and the monolithic perimeter frame 40, said joint
operation that allows to support greater efforts of continuous
loading, in particular, at the edges of the resulting core,
condition which is achieved by suppressing or eliminating from the
spring core 100 the retention band and insulation 30 that of origin
prevents or limits the penetration of the foaming material towards
the arrangement of springs.
[0056] In the proposed utility model, the effect of stabilizing and
increasing the structural strength of the edges of a bag-lined
spring core with a monolithic perimeter frame is achieved by
eliminating the retention and insulation band 30, in such a way
that shown in FIGS. 8 and 9, the arrangement of bag-lined springs
10' is arranged directly on a layer of support material or bottom
20' from which a surface 22' is defined on which a monolithic
perimeter frame 40' will be formed in situ and around of said
arrangement of bag-lined springs 10'.
[0057] In this way, when the retaining and insulation band 30 is
removed, during the forming process of the monolithic perimeter
frame 40' made in situ, the foaming material surrounding and
reinforcing the spring arrangement 10' will now be firmly attached
as part of the chemical reaction of your foaming process and
adhesion both to the support material 20' and to each of the bags
containing the peripheral springs of the core, said foaming
material also penetrating, in each of the empty spaces that are
defined between each of the bags containing the peripheral springs
of spring arrangement 10'.
[0058] According to what is illustrated in FIGS. 9 to 12, with the
proposed new configuration, it is achieved that the monolithic
perimeter frame 40' formed in situ, penetrates into the empty
spaces that are defined between each of the bags containing the
peripheral springs of the spring arrangement 10' and having the
possibility of coming into direct contact with each of said bags,
work together with the arrangement of springs. With this new
configuration it is achieved that the monolithic perimeter frame
40' embraces each peripheral bag in at least a portion close to 50%
of its circumference, while, in the case of the bags containing the
springs defining each of the four corners of the spring
arrangement, the portion surrounded by the monolithic perimeter
frame 40' is close to 75% of its total circumference.
[0059] Based on the foregoing, it is possible to establish that the
present utility model consists of a bag-lined spring core with
monolithic perimeter frame and reinforced and stabilized edges 100'
used in the manufacture of seats for furniture or mattresses, which
is comprised of: arrangement of springs 10'; a layer of support
material or bottom 20' on which the arrangement of springs 10' is
arranged and a surface 22' on which a perimeter frame rests; and a
monolithic perimeter frame 40' made in situ of foaming material
which surrounds, reinforces and bonds firmly as part of the
chemical reaction of its foaming and adhesion process both to the
support material 20' and to each of the bags containing the
peripheral springs of the nucleus.
[0060] It should be mentioned that the new configuration of the
bag-lined spring core with monolithic perimeter frame and
reinforced and stabilized edges 100' that is proposed, is not
intended to claim protection for the fact of having removed the
retention and isolation band 30 from the core of the patent
MX352,312B, but for the technical effect of making the peripheral
springs of the spring arrangement 10' work in combination with the
monolithic perimeter frame 40' to withstand compressive stresses
whose magnitude could cause permanent or premature deformations to
both the peripheral springs and the monolithic perimeter frame 40'
if these will support them independently.
[0061] In this regard it must be said that the solidifying effect
of the foaming material around the bags 14' containing the
peripheral springs of the spring arrangement 10' integrates these
two elements into one, a condition that, in itself, increases the
load resistance that both elements could have it in isolation.
[0062] In a preferred embodiment of the present utility model, the
foaming material with which the monolithic perimeter frame 40' is
constructed results, but is not limited to, a mixture for flexible
polyurethane foam.
[0063] In order to check the stability and increase of the
structural strength at the edges of the proposed new core, said
core has been subjected to stress and fatigue tests, in particular,
as shown in FIGS. 13 and 14, the edges of the core were subjected
with the help of a loading press 200 with a cycle of 1000
repetitions applying a dead load between 75 kg and 100 kg. The
results obtained demonstrated, on the one hand, that the union
between the monolithic perimeter frame 40' and the bags 14'
containing the peripheral springs of the spring arrangement 10'
stabilizes and increases the structural strength of the edges of
the proposed core, and on the other, that the resistance to fatigue
and deformation both of the peripheral springs of the spring
arrangement 10' and of the monolithic perimeter frame 40' is
greater when both elements are firmly joined and work together.
[0064] On the other hand, it should be mentioned that the present
utility model can be manufactured from the process claimed in the
patent MX352.312B, for which purpose step (a) must be omitted,
which consists in enclosing a previously prepared arrangement of
springs with a band of retention and isolation, and in relation to
step b) should be arranged directly the arrangement of springs on a
layer of support material inside the mold of injection or emptying,
that is, without that arrangement is surrounded by a band of
retention and isolation, stages c) to i) do not undergo any
modification and together with them it is possible to obtain the
new proposed nucleus.
[0065] According to all the previously described and illustrated,
it is possible to notice that the invention proposed as a
"bag-lined spring core with monolithic perimeter frame and
reinforced and stabilized edges", offers a practical, efficient and
economic solution to overcome the current inconveniences in the
technical field to which it belongs, specifically those that refer
to prevent premature deformation of both the springs arranged on
the periphery of a core of springs, or the own perimeter frame of
foaming material.
* * * * *