U.S. patent application number 13/274587 was filed with the patent office on 2013-04-18 for sensor mounting panel for an energy recovery ventilator unit.
This patent application is currently assigned to Lennox Industries Inc.. The applicant listed for this patent is Justin McKie, Eric Perez, Bryan Smith. Invention is credited to Justin McKie, Eric Perez, Bryan Smith.
Application Number | 20130095744 13/274587 |
Document ID | / |
Family ID | 48086307 |
Filed Date | 2013-04-18 |
United States Patent
Application |
20130095744 |
Kind Code |
A1 |
McKie; Justin ; et
al. |
April 18, 2013 |
SENSOR MOUNTING PANEL FOR AN ENERGY RECOVERY VENTILATOR UNIT
Abstract
An energy recovery ventilator unit. The unit comprises a sensor
mounting panel removably coupled to an outer surface of a cabinet,
wherein the sensor mounting panel is configured to hold a plurality
of sensors configured to measure the atmospheric environment inside
of one or more of an intake zone, a supply zone, or a return zone
housed inside of the cabinet.
Inventors: |
McKie; Justin; (Frisco,
TX) ; Perez; Eric; (Hickory Creek, TX) ;
Smith; Bryan; (Little Elm, TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
McKie; Justin
Perez; Eric
Smith; Bryan |
Frisco
Hickory Creek
Little Elm |
TX
TX
TX |
US
US
US |
|
|
Assignee: |
Lennox Industries Inc.
Richardson
TX
|
Family ID: |
48086307 |
Appl. No.: |
13/274587 |
Filed: |
October 17, 2011 |
Current U.S.
Class: |
454/251 ;
454/237 |
Current CPC
Class: |
Y02B 30/56 20130101;
F24F 2110/20 20180101; F24F 11/30 20180101; F24F 12/001 20130101;
Y02B 30/563 20130101; F24F 2110/10 20180101; F24F 2110/40
20180101 |
Class at
Publication: |
454/251 ;
454/237 |
International
Class: |
F24F 7/007 20060101
F24F007/007 |
Claims
1. An energy recovery ventilator unit, comprising: a sensor
mounting panel removably coupled to an outer surface of a cabinet,
wherein the sensor mounting panel is configured to hold a plurality
of sensors configured to measure the atmospheric environment inside
of one or more of an intake zone, a supply zone, or a return zone
housed inside of the cabinet.
2. The unit of claim 1, wherein each of the sensors are connected
to the sensor mounting panel by quick connect/disconnect plugs.
3. The unit of claim 1, wherein the sensors held to the sensor
mounting panel includes one or more temperature sensor, pressure
sensor and humidity sensor.
4. The unit of claim 1, wherein one or more of the sensors are each
configured to be extended into a forced air stream in one of the
zones.
5. The unit of claim 1, wherein the sensor mounting panel includes
a pressure conduit configured to hold a tube that is connected to a
pressure transducer, wherein an end of the tube is located remotely
from the sensor mounting panel.
6. The unit of claim 1, wherein the sensor mounting panel is
configured to hold one or more pressure switches thereon, the
pressure switch coupled to a pressure sensor configured detect a
pressure in the vicinity of an air filter located inside of the
cabinet.
7. The unit of claim 1, wherein the sensor mounting panel is
configured to hold one or more pressure switches thereon, the
pressure switch coupled to a pressure sensor configured detect a
pressure in the vicinity of an enthalpy wheel located inside of the
cabinet.
8. The unit of claim 1, wherein the sensor mounting panel includes
a bracket mounted thereto, the bracket configured to hold a
humidity sensor thereon and thereby extend the humidity sensor into
the cabinet.
9. The unit of claim 1, wherein the sensor mounting panel includes
sensors configured to measure the atmospheric environment inside
the intake zone which is located adjacent to an exhaust zone inside
of the cabinet, the intake zone and the exhaust zone both located
on a same side of an enthalpy exchange zone of the cabinet.
10. The unit of claim 1, wherein the sensor mounting panel includes
sensors configured to measure the atmospheric environment inside
the supply zone and the return zone, the supply zone and the return
zone both located on a same side of an enthalpy exchange zone of
the cabinet.
11. The unit of claim 1, wherein the outer surface of the cabinet
that the sensor mounting panel is coupled to is part of an exterior
side wall of the cabinet.
12. The unit of claim 1, wherein the sensor mounting panel is
coupled to a control panel which is mounted to the exterior surface
of an exterior sidewall of the cabinet, wherein the control panel
is configured to include one or more control modules for the
unit.
13. The unit of claim 1, further including second and third sensor
mounting panels, wherein the sensor mounting panel includes the
sensors mounted thereto that are configured to measure the
atmospheric environment inside of one of the intake zone, the
supply zone and the return zone, and the second and third sensor
mounting panels each include different sensors mounted thereto that
are each configured to measure the atmospheric environment inside
of one of the others of the intake air zone, the supply zone and
the return zone.
14. The unit of claim 1, further including: a first control panel
located on a side wall of the cabinet, wherein the sensor mounting
panel is coupled to the first control panel and the sensors mounted
thereto are configured to measure the atmospheric environment
inside the intake zone; and second control panel mounted to the
same side wall, wherein a second sensor mounting panel is coupled
to second control panel and the sensors mounted thereto are
configured to record the atmospheric environment inside of the one
of the supply zone or the return zone; and a third sensor mounting
panel is coupled to the second control panel and the sensors
mounted thereto are configured to record the atmospheric
environment inside of the other one of the supply zone or the
return zone.
15. The unit of claim 1, wherein the sensor mounting panel is
configured to cover an opening in an exterior side wall or in a
control panel of the cabinet that is large enough to permit the
passage of an air blower there-through when the sensor mounting
panel is removed from the opening.
16. A method of using an energy recovery ventilator unit,
comprising: coupling a removable sensor mounting panel to an outer
surface of a cabinet, wherein the sensor mounting panel is
configured to hold a plurality of sensors configured to measure the
atmospheric environment inside of one or more of an intake zone, a
supply zone, or a return zone housed inside of the cabinet.
17. The method of claim 16, further including attaching the sensors
to the sensor mounting panel, including attaching one or more
temperature sensor, pressure sensor or humidity sensor so as to be
located in a forced air stream traveling through one of the
zones.
18. The method of claim 16, detaching one or more of the sensors
from the sensor mounting panel while a forced air stream is
traveling through one of the zones.
19. The method of claim 16, replacing one or more of the sensors
from the sensor mounting panel with a different sensor while a
forced air stream is traveling through one of the zones.
20. The method of claim 16, accessing components of the energy
recovery ventilator unit through an opening in the outer surface of
the cabinet, the opening being exposed by removing the sensor
mounting panel from the opening.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is related to U.S. patent
application Ser. No. ______ (docket no. 100074), by McKie et al.,
entitled, "AN ENERGY RECOVERY VENTILATOR UNIT WITH OFFSET AND
OVERLAPPING ENTHALPY WHEELS" ("Appl-1"); U.S. patent application
Ser. No. ______ (docket no. 100075) by McKie et al., entitled, "A
TRANSITION MODULE FOR AN ENERGY RECOVERY VENTILATOR UNIT"
("Appl-2"); and U.S. patent application Ser. No. ______ (docket no.
100090), by McKie et al., entitled, "DESIGN LAYOUT FOR AN ENERGY
RECOVERY VENTILATOR SYSTEM" ("Appl-3"), which are all filed on the
same date as the present application, and, which are incorporated
herein by reference in their entirety. One or more of the above
applications may describe embodiments of Energy Recovery Ventilator
Units and components thereof that may be suitable for making and/or
use in some of the embodiments described herein.
TECHNICAL FIELD
[0002] This application is directed, in general, to space
conditioning systems and methods for conditioning the temperature
and humidity of an enclosed space using an energy recovery
ventilator.
BACKGROUND
[0003] Energy recover ventilator units recover energy from exhaust
air for the purpose of pre-conditioning outdoor air prior to
supplying the conditioned air to a conditioned space, either
directly, or, as part of an air-conditioning system. It is
desirable to periodically troubleshoot and service energy recovery
ventilator units.
SUMMARY
[0004] One embodiment of the present disclosure is an energy
recovery ventilator unit. The unit comprises a sensor mounting
panel removably coupled to an outer surface of a cabinet, wherein
the sensor mounting panel is configured to hold a plurality of
sensors configured to measure the atmospheric environment inside of
one or more of an intake zone, a supply zone, or a return zone
housed inside of the cabinet.
[0005] Another embodiment of the present disclosure is a method of
using an energy recovery ventilator unit that comprises coupling a
removable sensor mounting panel to an outer surface of a cabinet.
The sensor mounting panel is configured to hold a plurality of
sensors configured to measure the atmospheric environment inside of
one or more of an intake zone, a supply zone, or a return zone
housed inside of the cabinet.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Reference is now made to the following descriptions taken in
conjunction with the accompanying drawings, in which:
[0007] FIG. 1 presents an exploded three-dimensional view of an
example energy recovery ventilator unit that includes an example
embodiment of the sensor mounting panel of the disclosure;
[0008] FIG. 2 presents an exploded view of an example sensor
mounting panel of the disclosure similar to the sensor mounting
panel depicted in FIG. 1;
[0009] FIG. 3 presents an exploded view of another example sensor
mounting panel of the disclosure similar to the sensor mounting
panel depicted in FIG. 1;
[0010] FIGS. 4A and 4B present side views of another example energy
recovery ventilator unit of the disclosure, analogous to views 4
and 5, respectively, presented in FIG. 1 and including example
embodiments of the sensor mounting panel of the disclosure; and
[0011] FIG. 5 presents a flow diagram of an example method of using
an energy recovery ventilator unit of the disclosure, including any
of the example sensor mounting panels discussed in the context of
FIGS. 1-4B.
DETAILED DESCRIPTION
[0012] The term, "or," as used herein, refers to a non-exclusive
or, unless otherwise indicated. Also, the various embodiments
described herein are not necessarily mutually exclusive, as some
embodiments can be combined with one or more other embodiments to
form new embodiments.
[0013] As part of the present disclosure, it was recognized that an
impediment to troubleshooting and servicing many existing energy
recover ventilators is gaining access to sensors and other
components within the energy recover ventilator. Often, the
environmental sensors are distributed at different locations inside
of the energy recover ventilator. Consequently, to access the
sensors, the energy recover ventilator has to be shut off and
partial disassembled to gain access and to test the sensor.
Alternately, if service personnel attempted to access the sensors
while that energy recover ventilator was still operating, opening
up the energy recover ventilator to gain access to the sensor
changes the atmospheric environment inside of the energy recover
ventilator, which in turn, can deter troubleshooting because the
functioning of the energy recover ventilator has been altered.
Additionally, entry into the energy recover ventilator while it is
still operating can present a safety hazard to the service
personnel.
[0014] Various embodiments of the present disclosure address these
problems by providing a removable sensor mounting panel that
consolidates the location of several sensors. Certain embodiments
of the removable sensor mounting panel facilitates access to the
sensors from outside of the energy recover ventilator, even while
the energy recover ventilator is in operation, and consequently,
without having to substantially alter the atmospheric environment
within the energy recover ventilator.
[0015] One embodiment of the present disclosure is an energy
recovery ventilator unit. FIG. 1 presents a three-dimensional
exploded view of an example energy recovery ventilator unit 100
that includes an example embodiment of the sensor mounting panel
105 of the disclosure. FIGS. 2 and 3 present exploded views of
example sensor mounting panels 105 of the disclosure similar to the
sensor mounting panel 105 depicted in FIG. 1.
[0016] As illustrated in FIG. 1, the energy recovery ventilator
unit 100 comprises a sensor mounting panel 105 removably coupled to
an outer surface 107 of a cabinet 110. The sensor mounting panel
105 is configured to hold a plurality of sensors (e.g., sensors
112, 114, 116) configured to measure the atmospheric environment
inside of one or more of an intake zone 120, a supply zone 122, or
a return zone 124 housed inside of the cabinet 110.
[0017] As illustrated in FIG. 1, in some embodiments, the sensors
112, 114, 116 can be also be configured to measure the atmospheric
environment inside of an exhaust zone 126 or an enthalpy zone 128
inside of the cabinet 110. In some cases, the enthalpy zone 128 can
be merged with, or be part of, the intake zone 120 and/or exhaust
zone 126, while in other cases, the cabinet 105 has internal wall
portions that define a separate enthalpy zone 128.
[0018] As illustrated in FIG. 1, in some embodiments, the removable
sensor mounting panel 105 is configured as a modular component that
can be installed or replaced on-site. In some embodiments, the
removable sensor mounting panel 105 is coupled to the outer surface
107 via mounting structures 130, such as hinges or brackets, which
facilitate holding and removal of the panel 105 for replacement,
or, to provide mechanical access to components (e.g., sensors)
connected to the panel 105 or other components located inside one
of the zones 120-128.
[0019] In some cases, each of the sensors 112, 114, 116 can be
connected to the sensor mounting panel 105 by quick
connect/disconnect plugs, e.g., to facilitate rapid
attachment/detachment to and from the panel for troubleshooting or
replacement.
[0020] As illustrated in FIG. 1, in some embodiments, the sensors
held to the sensor mounting panel 105 can include one or more
temperature sensor 112, pressure sensor 114 and humidity sensor
116.
[0021] In some cases, the one or more of the sensors 112, 114, 116
are each configured to be extended into a forced air stream 135 in
one of the zones 120-128. This facilitates the accurate measurement
of the normal operating atmospheric environment inside of the
cabinet 110, while at the same time allowing the sensors to be
accessed and tested while the unit 100 is operating. The normal
operating atmospheric environment typically includes the forced air
passing from one zone to another zone as air is taken into the
cabinet, e.g. by a first blower 137 located in the intake zone 120
or by a second blower 138 located in the return air zone 124. As
illustrated, in some cases, the first blower 137 can be configured
to push outside air into the intake zone 120 and straight through\
the enthalpy exchange zone 128 into the supply zone 122, and the
second blower 138 can be configured to push return air into the
return zone 124 and straight through the enthalpy exchange zone 128
into the exhaust zone 126.
[0022] For instance, to facilitate extending the sensors into the
forced air stream 135, as illustrated in FIG. 2, the temperature
sensor 112 can include a probe 205 that is elongated so as to be in
the airstream 135 passing through one of the zones 120-128 (FIG.
1).
[0023] For instance, in some cases to facilitate extending the
sensors into the forced air stream 135, the pressure sensor 114 can
include an extension tube 210 and the end 212 of the tube can be
located remotely from the sensor mounting panel 105, e.g., in one
or the zones 120-128. For example, a pressure transducer 215 can be
connected to the end 217 of the tube 210 that is held by the panel
105. In some cases, the panel 105 can include a conduit 220 that is
configured to hold and allow the passage of the tube 210
there-through. However, in other cases, such as when the panel 105
is located directly adjacent to one of the zones 120-128 the
pressure sensor 114 can simply include a pressure barb 221 that
measures the pressure in the immediate vicinity of the panel 105
inside the cabinet 105.
[0024] For instance, to facilitate extending the sensors into the
forced air stream 135, the sensor mounting panel 105 can include a
bracket 222 mounted thereto, the bracket 222 configured to hold a
humidity sensor 116 thereon and thereby extend the humidity sensor
116 into the air-stream 135. In some cases, an electronic circuit
224 can be configured to derive enthalpy from the temperature and
humidity recorded from one the zones 120-128 can be mounted on the
bracket 222.
[0025] As further illustrated in FIG. 3, in some embodiments, the
sensor mounting panel 105 can be configured to hold one or more
pressure switches 310 thereon. The pressure switches 310 can be
coupled to a pressure sensor (not shown) that is configured measure
pressure in the vicinity of an enthalpy-exchanger device 140 (e.g.,
an enthalpy wheel) or an air 145 filter located inside of the
cabinet 110 (FIG. 1), such as the enthalpy zone 128. In some cases,
one or more of the pressure switches 310 can be further configured
to generate a signal if the air filter 145 is dirty and/or if the
pressure across the enthalpy wheel 140 has exceeded a maximum
allowable value.
[0026] As also illustrated in FIGS. 1 and 3, in some embodiments,
the sensor mounting panel 105 can further include an insulating
layer 150 coupled thereto, the insulating layer 150 having openings
(not shown) through which portions of the sensors 112, 114, 116 can
pass through.
[0027] In some embodiments, the sensor mounting panel 105 can
include sensors 112, 114, 116 configured to measure the atmospheric
environment inside the intake zone 120. As illustrated in FIG. 1,
the intake zone 120 can be located adjacent to an exhaust zone 126
inside of the cabinet 110, the intake zone 120 and the exhaust zone
126 both located on a same side of an enthalpy exchange zone 128 of
the cabinet 110. In some embodiments, the sensor mounting panel 105
includes sensors 112, 114, 116 configured to measure the
atmospheric environment inside the supply zone 122 and the return
zone 124, the supply zone 122 and the return zone 124 both located
on a same side of an enthalpy exchange zone 128 of the cabinet
110.
[0028] As illustrated in FIG. 1, in some cases, the outer surface
107 that the sensor mounting panel 105 is coupled to is part of an
exterior sidewall 160 of the cabinet 110.
[0029] In other embodiments, however the sensor mounting panel can
be mounted to a surface 107 of a control panel. Such an embodiment
is depicted in FIGS. 4A and 4B which present side views along view
lines 4 and 5, respectively in FIG. 1, of another example energy
recovery ventilator unit 100 of the disclosure. The embodiment
depicted in FIGS. 4A and 4B can include any of the sensor mounting
panels 105 and their component parts such discussed in the context
of FIGS. 1-3
[0030] As further illustrated in FIG. 4A, in some embodiments of
the unit 100, the sensor mounting panel 105 is coupled to a control
panel 410 which can be mounted to, or is part of, the exterior
surface 107 of an exterior sidewall 160 of the cabinet 110. The
control panel 410 can be configured to include a plurality of
control modules for the unit 100. In some cases the control panel
410 facilitates the consolidation of all of the control modules
that control substantially all of the functions of the unit 100.
For example, in some cases, the control panel 410 includes a unit
control module 415 with a visual display 420, a power distributer
block module 425, an external unit disconnect block module 427, an
enthalpy exchanger motor control module 430, voltage transformers
modules 435 and fuse block module 440. In some embodiments, the
control panel 410 can be configured as a removable panel, e.g., to
facilitate access to components located behind the panel 410 or
replacement of the panel 410.
[0031] As further illustrated in FIG. 4A, some embodiments of the
unit 100 can further include a second sensor mounting panel 450 or
a third sensor mounting panel 455. In some cases, the three
separate sensor mounting panels 105, 450, 455 can each hold a
plurality of sensors (e.g., similar to sensors 112, 114, 116
depicted in FIGS. 2 and 3) which are configured to measure
atmospheric environment in different ones of the zones 120, 122,
124, and optionally, other zones 126, 128 inside the cabinet
110.
[0032] For example, in some cases, the sensor mounting panel 105
includes the sensors 112, 114, 116 mounted thereto that are
configured to measure the atmospheric environment inside of one of
the intake zone 120, the supply zone 122 and the return zone 124.
The second and third sensor mounting panels 450, 455, can each
include similarly configured but different sensors 460, 462 mounted
thereto that are each configured to measure the atmospheric
environment inside one of the others of the intake air zone 120,
the supply zone 122 and the return zone 124.
[0033] For instance, as illustrated in FIGS. 1 and 4, the first
sensor mounting panel 105 can have sensors 112, 114, 116 configured
to measure temperature, pressure and humidity in the intake air
zone 120, the second sensor mounting panel 450 has sensors 460
configured to measure temperature, pressure and humidity in the
return air zone 124, and, the third sensor mounting panel 455 has
sensors 465 configured to measure temperature, pressure and
humidity in the supply air zone 122.
[0034] As further illustrated in FIG. 4A, in some embodiments, the
unit 100 can have more than one control panel, and there can be
multiple sensor mounting panels coupled to the different ones of
the control panels. For instance, there can be a first control
panel 450 located on the side wall 160 of the cabinet 110, and the
sensor mounting panel 105 can be coupled to the first control panel
450 and the sensors 112, 114, 116 mounted thereto are configured to
measure the atmospheric environment inside the intake zone 120.
There can also be a second control panel 470 mounted to the same
sidewall 160. In some cases, similar to the first panel, the second
control panel 470 can be a removable panel, or, the panel can
include a door 472, e.g., to permit service access to the enthalpy
zone 128 (e.g., the enthalpy-exchanger device 140 and air filters
145). A second sensor mounting panel 410 can be coupled to second
control panel 470 and the sensors 460 mounted thereto can be
configured to record the atmospheric environment inside of the one
of the supply zone 122 or the return zone 124. A third sensor
mounting panel can be coupled to the second control panel 470 and
the sensors 462 mounted thereto can be configured to record the
atmospheric environment inside of the other one of the supply zone
122 or the return zone 124.
[0035] In some embodiments, at least one of the second or third
mounting panels 450, 455 can be permanently fixed to the second
control panel 410 and the second control panel 410 can further
includes a door 475 configured to permit access to the sensors 450,
455 held by the second or third sensor mounting panels 450,
455.
[0036] In some embodiments the sensor mounting panel (e.g., any of
sensor mounting panels 105, 450, 455) is configured to cover an
opening in an exterior side wall 160 or in a control panel (e.g.,
any one of control panels 410, 470) of the cabinet 105 that is
large enough to permit the passage of an air blower or other
similarly large-sized electronic components there-through when the
sensor mounting panel is removed from the opening. E.g., the sensor
mounting panel can completely separated from the cabinet 110 or
swung open on a hinge.
[0037] For example, as illustrated in FIG. 4A, the second sensor
mounting panel 450 covers an opening 480 in the second control
panel 470. The opening 480 is large enough to permit mechanical
service access and removal of a return air blower 138 located in
the return air zone 124 through the opening 480. Similarly, in some
embodiments, the sensor mounting panel can be configured to cover
an opening in the first control panel 410 that is large enough to
permit the passage of the intake air blower 137 there-through.
[0038] As further illustrated in FIGS. 4A and 4B, in some
embodiments, the sensor mounting panel (e.g., anyone or all of
panels 105, 450, 455) is coupled to a surface of the cabinet 110
that is located inside of a recess 485 in a sidewall 160 of the
cabinet 110. Locating the sensor mounting panel in a recess 485
facilitates covering the sensor mounting panel with a removable
panel or door, e.g., to protect the one or more sensor mounting
panels from harsh environmental conditions, but still give ready
access to the sensor mounting panel.
[0039] Another embodiment of the present disclosure is a method of
using an energy recovery ventilator unit, such as any of the units
100, and their sensor mounting panels 105, such as discussed in the
context of FIGS. 1-4B. FIG. 5 presents a flow diagram of an example
method 500 of manufacture.
[0040] With continuing reference to FIGS. 1-4B throughout, the
example method 500 comprises a step 510 of coupling a removable
sensor mounting panel 105 to an outer surface 107 of a cabinet 110.
As previously discussed herein, the sensor mounting panel 105 is
configured to hold a plurality of sensors 112, 114, 116 configured
to measure the atmospheric environment inside of one or more of a
intake zone 120, a supply zone 122, or a return zone 124 housed
inside of the cabinet 110, or optionally the exhaust air zone 126
or enthalpy exchange zone 128.
[0041] In some embodiments, the method 500 further includes a step
520 of attaching the sensors 112, 114, 116 to the sensor mounting
panel 105, including attaching (e.g., via quick connect/disconnect
plugs) one or more temperature sensor 112, pressure sensor 114 or
humidity sensors 116, so as to be located in a forced air stream
135 traveling through one of the zones 120, 122, 124, or
optionally, through the other zones 126, 128.
[0042] In some embodiments, the method 500 further includes a step
530 of detaching one or more of the sensors 112, 114, 116 from the
sensor mounting panel while a forced air stream 135 is traveling
through one of the zones 120, 122, 124, or optionally, the other
zones 126, 128 (e.g., while the unit 100 is operating).
[0043] In some embodiments, the method 500 further includes a step
540 replacing one or more of the sensors 112, 114, 116 from the
sensor mounting panel with a different sensor while a forced air
stream 135 is traveling through one of the zones 120, 122, 124, or
optionally, through the other zones 126, 128.
[0044] As noted elsewhere herein, the ability to remove and/or
replace the sensor 112, 114, 116 while the energy recover
ventilator unit 100 is operating can facilitate trouble shooting
the unit 100 as well as reduce safety hazards to service
personnel.
[0045] In some embodiments, the method 500 further includes a step
550 of accessing components of the energy recovery ventilator unit
100 through an opening 480 in the outer surface 107 of the cabinet,
the opening 480 being exposed by removing the sensor mounting panel
(e.g., any or panels 105, 450, 455) from the opening 480.
[0046] Those skilled in the art to which this application relates
will appreciate that other and further additions, deletions,
substitutions and modifications may be made to the described
embodiments.
* * * * *