NZ583590A - An electrical enclosure and a gasket with a hard stop for an electrical enclosure - Google Patents
An electrical enclosure and a gasket with a hard stop for an electrical enclosureInfo
- Publication number
- NZ583590A NZ583590A NZ583590A NZ58359010A NZ583590A NZ 583590 A NZ583590 A NZ 583590A NZ 583590 A NZ583590 A NZ 583590A NZ 58359010 A NZ58359010 A NZ 58359010A NZ 583590 A NZ583590 A NZ 583590A
- Authority
- NZ
- New Zealand
- Prior art keywords
- gasket
- lid
- seal
- frame
- base
- Prior art date
Links
- 239000000428 dust Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 description 6
- 238000005336 cracking Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009429 electrical wiring Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/08—Distribution boxes; Connection or junction boxes
- H02G3/088—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings or inlets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/08—Distribution boxes; Connection or junction boxes
- H02G3/10—Distribution boxes; Connection or junction boxes for surface mounting on a wall
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
A gasket for an electrical enclosure and an electrical enclosure, for sealing an electrical component from dust and moisture, is disclosed. To provide ingress protection against both dust and moisture, the gasket, mountable between a lid and base of an electrical enclosure includes: a gasket frame; a gasket seal that presents sealing faces to the lid and the base where the gasket seal is connected to the gasket frame; and a hard stop connected to the gasket frame. The hard stop provides an outermost periphery for the gasket, where, in use, compression of the gasket seal is controlled by the hard stop which is sandwiched between the lid and the base.
Description
Form 5
RECEIVED at IPONZ on 10 May 2010
Page 1 of 3
Complete Specification
Apply online www.iponz.govt.nz/online-services
Where priority as provided by subsection (2) or subsection (3) of section 11 of the Patents Act 1953 is wanted in respect of one or more provisional specifications, please quote the number(s) below
Patent Number(s)
Date(s)
AU 2010200690
February 2010
Title Of invention: AN ELECTRICAL ENCLOSURE AND A GASKET FOR AN ELECTRICAL ENCLOSURE
I (or We) (State full name, address, and nationality of applicants) as. in application form)
Clipsal Australia Pty Limited, of 12 Park Terrace, Bowden, 5007,
South Australia, Australia, an Australian company.
hereby declare the invention, for which I (or we) pray that a patent may be granted to me (or us), and the method by which it is to be performed, to be particularly described in and by the following statement (On the next page begin full description of invention. The continuation of the specification should be upon paper of the same size as this form, on ohepide only, with the lines well spaced and with a margin of 2.5 cm on the left hand part of the paper. The completion of the description should be followed by the claim or claims numbered consecutively, (See note belbw,) The specification must be signed M the end) :
NOTE.--The claims must relate to a single invention, must be clear and succinct, and must b& fairly based on the matter disclosed in the specification. They should form in brief a clear statement of that which constitutes the invention. Applicants should be careful that their claims include neither more nor less than they desire to protect by their patent. Any unnecessary multiplicity of claims or prolixity of language should be avoided. Claims should not be made for the efficiency or advantages of the invention.
\ o MAY 20TO RECEIVED
For assistance completing this form please call 0508 4 IPONZ (0508 447 669)
RECEIVED at IPONZ on 13 July 2011
AN ELECTRICAL ENCLOSURE AND A GASKET FOR AN ELECTRICAL ENCLOSURE FIELD OF THE INVENTION
The invention relates to electrical enclosures and components for electrical enclosures, in particular electrical enclosures that protect against the ingress of both dust and moisture.
BACKGROUND TO THE INVENTION
Electrical enclosures that protect against the ingress of both dust and moisture are required for industrial switch gear. Such switch gear is often required to operate in harsh industrial environments. For instance industrial switch gear generally satisfies an international protection rating or ingress protection rating ("IP" rating). Many application require IP56 protection which may be defined as "dust protected" and 10 protected against "powerful water jets". IP56 is simply an example of a level of protection that may be required for an electrical enclosure. Other requirements include IP66 and TP22 for example.
Electrical enclosures are typically manufactured to a quality standard within a factory environment. The electrical enclosures are then packaged and sold for installation in the field by electricians. When installing an IP56 electrical enclosure for example, an electrician is required to terminate electrical wiring 15 to the enclosure and is required to seal the enclosure by sandwiching a gasket between a base and a lid of the electrical enclosure. The lid is typically secured to the base using screws. As the electrician tightens the screws, the gasket is compressed thereby sealing the lid against the base so as to prevent the ingress of both dust and moisture into the cavity formed between the lid and the base.
A difficulty with prior art electrical enclosures is that there is a high degree of reliance on the skill of the 20 electrician to correctly assemble the components so as to obtain an adequate seal between the base, the gasket and the lid. If screws holding the lid to the base are over tightened, excessive compression of the gasket can occur in local areas and distortion of the lid can occur. Furthermore, excessive stresses can occur at or near the screws which can cause cracking, either at the point of installation or possibly months or years later. In harsh environments, chemicals can attack areas of high stress leading to cracking and 25 failing of the enclosure allowing the ingress of dust and or moisture into the enclosure.
It is an object of the invention to provide an improved gasket for an electrical enclosure.
It is a further object of the invention to provide an improved electrical enclosure.
SUMMARY OF THE INVENTION
According to a first aspect of the invention, there is provided a gasket for an electrical enclosure, the gasket providing ingress protection against both dust and moisture, the gasket mountable between a lid and a base, the gasket including:
a gasket frame;
1
RECEIVED at IPONZ on 13 July 2011
a gasket seal that presents sealing faces to the lid and the base, the gasket seal connected to the gasket frame; and a hard stop connected to the gasket frame, the hard stop providing an outermost periphery for the gasket,
whereby, in use, compression of the gasket seal is controlled by the hard stop which is sandwiched between the lid and the base.
In one form the hard stop is integral with the gasket frame.
In one form the hard stop is a T-shaped flange peripheral to the gasket frame, the T-shaped flange having a top and a stem, the top of the T-shaped flange having end faces that are sandwichable between the lid and the base.
In one form the gasket seal extends from either side of the stem of the T-shaped flange to provide a pair 15 of opposed sealing faces disposed beyond the end faces of the T-shaped flange, whereby, in use, the gasket seal is compressed such that the sealing faces are aligned with the end faces of the T-shaped flange.
In one form the top of the T-shaped flange, in use, is positioned to form a continuous barrier between the 20 lid and the base, thereby affording a degree of protection to the gasket seal.
In one form the gasket is a co-moulded single piece.
In one form the gasket frame has a first elastic modulus and the gasket seal has a second elastic modulus, 25 the second elastic modulus lower than the first elastic modulus such that when a given compressive stress is applied, the gasket seal is strained at least three times as much as the gasket frame.
In one form the gasket seal is strained at least ten times as much as the gasket frame.
According to a second aspect of the invention there is provided an electrical enclosure for sealing an electrical component from both dust and moisture, the enclosure including a base, a lid and a gasket as previously described.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT OF THE INVENTION
A preferred embodiment of the invention as illustrated in the accompanying representations in which:
2
RECEIVED at IPONZ on 13 July 2011
Figures la & lb are exploded isometric views of an electrical enclosure according to an embodiment of the invention.
Figure 2a is an isometric view of the gasket shown in figures la and lb.
Figure 2b is an isometric view of a gasket according to an alternative embodiment of the invention. 5 Figure 3 is a plan view of the gasket frame of the gasket shown in figure 2a.
Figures 4a and 5a are cross-sectional views taken through section lines 4a -4a and 5a-5a illustrated in figure 3.
Figures 4b and 5b are close up views of the portions of the gasket frame indicated by arrows 4b and 5b of figures 4a and 5a respectively.
Figure 6 is a plan view of the gasket shown in figure 2a.
Figures 7a and 8a are cross-sectional views taken through section lines 7a-7a and 8a-8a illustrated in
3
RECEIVED at IPONZ on 20 April 2011
Figures 7b and 8b are close up views of the portions of the gasket indicated by arrows 7b and 8b of figures 7a and 8a respectively.
Figure 9 is a front view of the enclosure of figures la and lb.
Figure 10 is an exploded side view of the enclosure of figure la.
Figure 11 is a cross-sectional view taken through the section lines 11-11 indicated in figure 9.
Figures 12 and 13 are detailed views of the portions of the enclosure as indicated by arrows 12 and 13 respectively in figure 11.
Referring to figures la and lb, an electrical enclosure 10 for sealing an electrical component or 10 components from both dust and moisture is shown. The enclosure includes a base 20, a lid 30 and a gasket 50. The base 20, the lid 30 and the gasket 50 are mutually shaped such that compression of the gasket seal 70 is controlled by a hard stop provided by sandwiching of a portion of the gasket frame 64 between the base 20 and the lid 30.
The electrical enclosure 10 shown in figures la and lb enclose a switch portion 34 and a power socket portion 35. The switch portion 34 receives a switch knob (not shown) with an O-ring seal. The power socket is covered by a .flap (not shown) having an. over-moulded gasket. Electrical wiring for these components is protected from the ingress of dust and moisture by the assembled enclosure. In other embodiments of the invention, not shown, the enclosure may house electrical, electronic or other 20 components that need to be protected from the ingress of dust and moisture for instance. The enclosure 10, with a simplified lid 30, may be used as a terminal box.
Referring now to figure 2a, the gasket 50 is shown in more detail. The gasket is preferably a single piece co-moulded or over-moulded gasket.
The gasket frame 60 is made from a plastics material having a first elastic modulus and comprises 10% talc filled copolymer polypropylene. Other suitable materials may be used instead. Co-moulded or over-moulded with the gasket frame 60 is a gasket seal 70. The gasket seal 70 is made from a material that is pliant. In the embodiment illustrated, the material used for the gasket seal 70 comprises oil extended 30 thermoplastic styrenic rubber modified polypropylene compound. The gasket seal 70 has a second elastic modulus, the second elastic modulus lower than the first elastic modulus such that when a given compressive stress is applied, the gasket seal is strained (compressed) at least three times as much as the gasket frame.
An alternative gasket to that shown in figure 2a is shown in figure 2b. The gasket shown in figure 2a may be referred to as a "two-gang" gasket, whereas the gasket shown in figure 2b may be referred to as a "one-gang" gasket. The "one-gang" gasket of figure 2b is the same general construction to that shown in
4
RECEIVED at IPONZ on 20 April 2011
figure 2a. Again, the gasket 50 has a gasket frame 60 made from a stiff plastics material and co-moulded or over-moulded with the gasket frame 60 and the gasket seal 70. Again, the gasket seal 70 is made from a material that is pliant.
Turning now to figures 3,4a and 4b, 5a and 5b, the gasket frame 60 of the gasket 50 is more easily visualised (as it is shown without the co-moulded gasket seal 70).
Figures 4a and 4b provide a cross-sectional view through section lines 4a-4a illustrated in figure 3.
Section 4a-4a is taken through screw holes 69. The construction of the gasket 50 generally is apparent
from figure 4a and figure 4b is a magnified view of the region indicated by arrow 4b on figure 4a. From figure 4b it can. be seen that the gasket frame 60 includes a peripheral T-shaped flange 63, the T-shaped flange 63 having a top 64 and a stem 65. The top 64 has end faces 66 and 67 that provide a hard stop sandwichable between the lid 30 and the base 20. This sandwiching is clearly shown in. figures 11 and 12.
Referring now to figures 5a and 5b taken through section lines 5a-5a illustrated in figure 3. it can be seen that the gasket frame includes an inner locating portion 68. This inner locating portion 68 is shown in figure 13 captured between a leg 32 of the lid and the peripherary 39 of the lid 30. In other embodiments of the invention, the leg 32 may be omitted.
Now referring to figures 6, 7a arid 7b, 8a and 8b, the gasket 50 is shown in full. In particular, it can be seen from figures 7b and 8b that the gasket seal 70 is connected to the gasket frame 60. In one embodiment of the invention, the connection is by virtue of a co-moulding process. In other embodiments of the invention, the gasket frame and gasket seal may be manufactured as separate components and then subsequently bonded together.
Referring again to figures 7b and 8b, it can be seen that the gasket, seal 70 extends from either side of the T-shaped flange 63 to provide a pair of opposed sealing faces 74 and 75 that, are disposed beyond the end faces 66 and 67 of the T-shaped flange 63.
Now referring to figures 11, 12 and 13, the gasket 50 and gasket seal 70 can be seen in use. In particular, it can be seen that the gasket seal 70 is compressed such that the sealing faces 74 and 75 shown in figures 7b and 8b respectively are compressed such that they are aligned with the end faces 66 and 67 of the T-shaped flange (in figures 12 and 13, the actual compression is not shown, instead compression is represented by overlapping cross-sections).
The degree of compression is controlled by the geometry shown in figure 12. In the embodiment shown the compression of the gasket seal is approximately 30%.
RECEIVED at IPONZ on 20 April 2011
Referring again to figures 11,12 and 13, it can be seen that the electrical enclosure 10 provides an enclosed portion 90 that is sealed to IP 56 standard against the ingressed so the ingress of dust or moisture. The hard stop provided by the peripheral T-shaped flange 63 as described above provides for 5 controlled gasket seal deformation. This reduces the reliance on the skill of the electrician to correctly assemble the base 20, the gasket 50 and the lid 30 together. The electrician can tighten the screws 41 that extend through holes 31 in the lid 30, holes 51 in the gasket 50 and into holes 21 within the base 20 until the top 64 of the peripheral T-shaped flange 63 is sandwiched between the base 20 and the lid 30. Thus, the electrician is less likely to over tighten the screws which in turn means that cracking, either at the time 10 of installation or possibly months or years later is must less likely. Furthermore, distortion of components is less likely greatly improving the performance of the gasket and minimising the possibility of any ingress of dust or moisture into the enclosure.
A further benefit of the gasket 50 shown in figure 2a when installed between the base 20 and lid 30, is 15 that the top 64 of the T-shaped flange 63 provides a degree of protection to the gasket seal 70. More specifically, it can be seen from the drawings that the top 64 of the peripheral T-shaped flange 63 provides a continuous barrier between the lid 30 and the base 20. Should the enclosure 10 be exposed to water jets or abrasion from dust, grit or other particles, the seal 70 is protected by the gasket frame 60. This lessens the likelihood of failure of the seal 70 and hence lessens the likelihood of ingress of dust or 20 moisture into the enclosed portion 90 of the electrical enclosure 10.
The electrical enclosure 10 illustrated in the drawings as described above uses the gasket illustrated in figure 2a, In other applications, an electrical enclosure of a squarer shape may be used with the gasket shown in figure 2b. Similarly, larger enclosures may be employed for some applications incorporating 25 two gaskets of the type shown in figure 2b alongside one gasket of the type shown in figure 2a for instance.
The enclosure 10 shown in figure la and lb may be sold partially pre-assembled. For instance the screws 41 may be positioned through the lid 30 and the gasket 50 so that the electrician only has to attach the lid 30 (with screws and gaskets already attached) onto the base 20. The gasket 50 can be constructed to retain the screws 41 prior to their final assembly into the base 20.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestions that such prior art forms part of the common general knowledge of the 35 technical field.
6
RECEIVED at IPONZ on 13 July 2011
It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.
7
Claims (8)
1. A gasket for an electrical enclosure, the gasket providing ingress protection against both dust and moisture, the gasket mountable between a lid and a base, the gasket including: 5 a gasket frame; a gasket seal that presents sealing faces to the lid and the base, the gasket seal connected to the gasket frame; and a hard stop connected to the gasket frame, the hard stop providing an outermost periphery for the gasket, 10 whereby, in use, compression of the gasket seal is controlled by the hard stop which is sandwiched between the lid and the base.
2. A gasket as claimed in claim 1 wherein the hard stop is integral with the gasket frame.
3. A gasket as claimed in either one of claims 1 or 2 wherein the hard stop is a T-shaped flange 15 peripheral to the gasket frame, the T-shaped flange having a top and a stem, the top of the T- shaped flange having end faces that are sandwichable between the lid and the base.
4. A gasket as claimed in claim 3 wherein the gasket seal extends from either side of the stem of the T-shaped flange to provide a pair of opposed sealing faces disposed beyond the end faces of the 20 T-shaped flange, whereby, in use, the gasket seal is compressed such that the sealing faces are aligned with the end faces of the T-shaped flange.
5. A gasket as claimed in claim 4 wherein the top of the T-shaped flange, in use, is positioned to form a continuous barrier between the lid and the base, thereby affording a degree of protection 25 to the gasket seal.
6. A gasket as claimed in any of the preceding claims wherein the gasket is a co-moulded single piece. 30
7. A gasket as claimed in any of the preceding claims wherein the gasket frame has a first elastic modulus and the gasket seal has a second elastic modulus, the second elastic modulus lower than the first elastic modulus such that when a given compressive stress is applied, the gasket seal is strained at least three times as much as the gasket frame. 35
8. A gasket as claimed in claim 7 wherein the gasket seal is strained at least ten times as much as the gasket frame. 8 RECEIVED at IPONZ on 13 July 2011 An electrical enclosure for sealing an electrical component from both dust and moisture, the enclosure including: a base; a lid; and a gasket according to any one of claims 1 to 8. A gasket for an electrical enclosure as hereinbefore described with reference to and as illustrated in the accompanying drawings. An electrical enclosure as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2009900877A AU2009900877A0 (en) | 2009-02-27 | An electrical enclosure and a gasket for an electrical enclosure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ583590A true NZ583590A (en) | 2011-09-30 |
Family
ID=42732338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ583590A NZ583590A (en) | 2009-02-27 | 2010-02-25 | An electrical enclosure and a gasket with a hard stop for an electrical enclosure |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU2010200690B2 (en) |
| NZ (1) | NZ583590A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI259501B (en) * | 2000-12-07 | 2006-08-01 | Shinetsu Polymer Co | Seal and substrate container using same |
| JP5198335B2 (en) * | 2008-08-27 | 2013-05-15 | 日本メクトロン株式会社 | Seal structure of electronic equipment |
-
2010
- 2010-02-25 AU AU2010200690A patent/AU2010200690B2/en active Active
- 2010-02-25 NZ NZ583590A patent/NZ583590A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU2010200690B2 (en) | 2015-04-09 |
| AU2010200690A1 (en) | 2010-09-16 |
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