U.S. patent application number 10/369068 was filed with the patent office on 2003-07-10 for thermoinsulating knapsack.
This patent application is currently assigned to SAES GETTERS S.p.A.. Invention is credited to Manini, Paolo.
Application Number | 20030127475 10/369068 |
Document ID | / |
Family ID | 11445728 |
Filed Date | 2003-07-10 |
United States Patent
Application |
20030127475 |
Kind Code |
A1 |
Manini, Paolo |
July 10, 2003 |
Thermoinsulating knapsack
Abstract
The present invention relates to a thermoinsulating knapsack for
carrying beverages, comprising a sack (1) provided with straps (2)
for transportation on the back, inside which is arranged a
container (3) for a beverage. Said container (3) is provided with
an opening into which is inserted a flexible tube (4) which enables
the beverage to be sorbed. One or more evacuated panels (5, 6)
comprising an envelope which encloses powder of an inert material
with average particle size lower than 100 nanometers are arranged
between said sack (1) and said container (3).
Inventors: |
Manini, Paolo; (Arluno,
IT) |
Correspondence
Address: |
AKIN GUMP STRAUSS HAUER & FELD L.L.P.
ONE COMMERCE SQUARE
2005 MARKET STREET, SUITE 2200
PHILADELPHIA
PA
19103-7013
US
|
Assignee: |
SAES GETTERS S.p.A.
|
Family ID: |
11445728 |
Appl. No.: |
10/369068 |
Filed: |
February 19, 2003 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10369068 |
Feb 19, 2003 |
|
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PCT/IT01/00398 |
Jul 25, 2001 |
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Current U.S.
Class: |
224/148.2 ;
224/148.3; 224/148.5; 224/627 |
Current CPC
Class: |
A45F 3/04 20130101; A45F
3/20 20130101; F25D 2201/14 20130101 |
Class at
Publication: |
224/148.2 ;
224/148.3; 224/148.5; 224/627 |
International
Class: |
A45F 003/16; A45F
005/00; A45F 003/04 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 23, 2000 |
IT |
MI2000A 001902 |
Claims
1. Thermoinsulating knapsack for carrying beverages, comprising a
sack (1) provided with straps (2) for transportation on the back
inside which is arranged a container (3) for a beverage provided
with an opening into which is inserted a flexible tube (4) which
enables the beverage to be sorbed, characterized in that one or
more evacuated panels (5, 6) comprising an envelope which encloses
powder of an inert material with average particle size lower than
100 nanometers are arranged between said sack (1) and said
container (3).
2. Thermoinsulating knapsack according to the preceding claim,
characterized in that the particles of the powder of inert material
have an average size comprised between 2 and 20 nanometers.
3. Thermoinsulating knapsack according to one of the preceding
claims, characterized in that the envelope is made of a plastic,
optionally metallized material.
4. Thermoinsulating knapsack according to one of the preceding
claims, characterized in that the powder of inert material is mixed
with mineral fibers.
5. Thermoinsulating knapsack according to the preceding claim,
characterized in that said mineral fibers are glass fibers.
6. Thermoinsulating knapsack according to one of the preceding
claims, characterized in that said inert material is silica.
7. Thermoinsulating knapsack according to the preceding claim,
characterized in that the silica is pyrogenic silica.
8. Thermoinsulating knapsack according to the preceding claim,
characterized in that said evacuated panels (5, 6) have a thickness
comprised between 4 and 15 mm.
9. Thermoinsulating knapsack according to one of the preceding
claims, characterized in that said evacuated panels (5, 6) are two
and that they are curved and mutually fastened by means of their
flanges so that together they form a tubular body whose cavity is
occupied by the container (3).
Description
[0001] The present invention relates to a knapsack for sportsmen,
suitable for carrying water or other beverages while maintaining
constant their temperature and for drinking said beverages without
having to take the knapsack off
[0002] It is known that the people who train a sport activity for a
long period of time need to drink frequently in order to avoid
becoming dehydrated. Since some kinds of activities, such as
cycling, keep constantly busy the hands of the sportsman, a
knapsack has been devised which internally comprises a container
for a beverage. Said container is provided with a thin tube through
which the beverage can be sorbed by the sportsman, so that he can
drink without having to stop his activity. The knapsack can be
thermally insulated by means of fibrous insulators, such as glass
wool or rock wool.
[0003] However, the insulating features of these materials are not
sufficient for maintaining constant the temperature of the beverage
for a long period of time.
[0004] In order to obviate this problem, it was thought to
manufacture the thermal insulation of the knapsack by using
thermoinsulating evacuated panels of the known type, for example
those formed of a board of open-cells polymeric foam contained in
an evacuated envelope.
[0005] However, these panels are rigid and can be with difficulty
adjusted to the walls of the knapsack that preferably has an
anatomical and optionally non-rigid shape, with a higher volume
when it is filled of the beverage and a progressively decreasing
volume when the beverage is consumed.
[0006] Further, since a substantial requirement of said envelope is
a high gas-tightness, it is formed of barrier sheets containing
aluminum layers which confer to the envelope itself a certain
fragility. Therefore, said panels should be placed inside a
preferably rigid protective structure in order to avoid the
cracking of the envelopes which would compromise the thermal
insulation properties of the panels.
[0007] Therefore, object of the present invention is providing a
thermoinsulating knapsack which is free from the above mentioned
drawbacks. Said object is achieved by means of a thermoinsulating
knapsack whose main features are specified in the first claim and
other features are specified in the following claims.
[0008] The panels used for the thermal insulation of the knapsack
according to the present invention employ, as a filling material, a
powder of an inert material having average particle size lower than
100 nanometers (nm) and preferably comprised between about 2 and 20
nanometers, It has been found that by the use of these powders, the
thermal conductance of the panels varies only slightly, and
particularly remains lower than about 8 mW/m.multidot.K, for
internal pressures up to a few tens of unbar, differently from the
panels based on polymeric foams wherein the thermal conductance
grows rapidly when the internal pressure is higher than about 1
mbar. For this reason, it is possible to maintain pressures even
higher than 10 mbar inside the evacuated panels according to the
invention, so that it is not necessary to use envelopes which
contain aluminum sheets, necessary above all in the applications at
high temperature. This particular measure, which reduces at
negligible values the thermal bridge, enables the nearly total
utilization of the insulating properties of the filling material of
the evacuated panels according to the invention. Due to their very
reduced size, the particles of the powders can form, because of
cohesive or electrostatic forces, aggregates having size of a few
micrometers (.mu.m) or even higher, without causing variations of
the thermal insulation properties of the panels.
[0009] By using as a filling a block of very fine powder of an
inert material, it is possible to obtain evacuated panels which can
be bent or curved, so that they can be adapted to the anatomical
shape of the knapsack inside which they have to be inserted, as
well as to the eventual variations of shape and volume of the
container when it is filled or emptied of the beverage.
[0010] Further, thanks to their envelope being formed of a plastic
multilayer comprising no aluminum layers, the evacuated panels used
for the thermoinsulating knapsack according to the present
invention are more solid than the known panels based on polymeric
foams and can be placed inside the same knapsack without providing
a protective structure suitable for preventing the accidental
cracking of the envelopes.
[0011] According to a particular aspect of the invention, the inert
material of the powder is silica preferably mixed with numeral
fibers, so that it can be easily compressed in order to make blocks
of even a few millimeter thickness, which can be placed in an
envelope, evacuated and subsequently curved with relative ease.
[0012] Further advantages and features of the knapsack according to
the present invention will appear to those which are skilled in the
art from the following detailed description of one embodiment
thereof with reference to the accompanying drawings, wherein:
[0013] FIG. 1 shows a perspective view of the complete
thermoinsulating knapsack according to said embodiment; and
[0014] FIG. 2 shows a perspective view of the knapsack of FIG. 1
from which the external sack has been removed.
[0015] With reference to FIG. 1, there is shown that the knapsack
according to said embodiment of the present invention comprises a
sack 1 made of a flexible material, for example fabric, provided
with two straps 2 for transportation on the back. Inside said sack
1 is positioned a container 3 made of a liquid-tight material,
suitable for containing water or another refreshing beverage Said
container is completely closed with the exception of a small upper
opening suitable for enabling the coining out of the drink by means
of a small tube 4 having the function of a straw. As a matter of
fact, one end of said tube 4 is immersed into the beverage inside
the container, whereas the other end is inserted between the lips
of the sportsman when he wishes to drink.
[0016] In the present embodiment the container 3 is formed of an
envelope made of a flexible material, for instance plastic sheets,
but the use of any other material known for containing alimentary
beverages can be involved in other embodiments.
[0017] Tube 4 can be fastened at the central portion thereof to one
of the straps 2 so that it is always within the reach of the
sportsman.
[0018] With reference to FIG. 2, two evacuated, slightly curved
panels 5 and 6 are shown to be positioned externally of container
3. Said panels are arranged side by side so that together they form
a substantially tubular body whose cavity is occupied by container
3. Besides, the two evacuated panels 5 and 6 can be fastened to one
another by gluing or welding in pairs their lateral flanges.
[0019] Evacuated panels 5 and 6 have a thickness comprised for
example between 4 and 15 mm and are formed of an envelope of a
laminated plastic, optionally metallized, wherein a very fine
powder of an inert material is enclosed, particularly silica. The
plastic material used for the envelope can be any known material
which is considered to be suitable for the construction of
evacuated panels of traditional type, for example a polyolefin. The
pressure inside the envelope is lower than 50 mbar, whereas the
silica powder is preferably mixed to with mineral fibers,
particularly glass fiber. The silica is preferably pyrogenic
silica, a form of silica which is obtained by burning SiCl.sub.4
with oxygen in a suitable chamber, according to the reaction:
SiCl.sub.4+O.sub.2.fwdarw.SiO.sub.2+2 Cl.sub.2
[0020] The silica produced in this reaction is in the form of
particles of size comprised between a few nanometers and a few tens
of nanometers, which can optionally be agglomerated to form
particles of bigger size, as previously described. Pyrogenic silica
is produced and sold for instance by the US company CABOT Corp.
under the name Nanogel.RTM. or by the German company Wacker
GmbH.
[0021] In the present embodiment the internal space of the sack 1
is completely occupied by container 3 and by insulating panels 5
and 6 placed around it, but in other embodiments said sack 1 could
be provided with more compartments and lateral pockets so as to
serve for the transportation of other objects or food, further to
the beverage.
[0022] Further variations and/or additions can be made by those
which are skilled in the art to the described and illustrated
embodiment by remaining within the limits of the invention
itself.
* * * * *