U.S. patent application number 11/606708 was filed with the patent office on 2008-05-29 for ptc airflow heater.
Invention is credited to Tianyu Gao.
Application Number | 20080124060 11/606708 |
Document ID | / |
Family ID | 39463822 |
Filed Date | 2008-05-29 |
United States Patent
Application |
20080124060 |
Kind Code |
A1 |
Gao; Tianyu |
May 29, 2008 |
PTC airflow heater
Abstract
An airflow heater includes a housing, a control arrangement
supported at an upper portion of the housing, an air source for
generating a flow of air, a PTC heat generator for generating heat,
and a terminal unit including an upward terminal connector upwardly
extended from the PTC heat generator to align with the control
arrangement and a sideward terminal connector rearwardly extended
from the PTC heat generator to minimize a distance between the
terminal unit and the control arrangement for electrical
connection. The upward terminal connector and the sideward terminal
connector are electrically connected to the control arrangement.
The air source and the PTC heat generator are activated by the
control arrangement for generating the air towards the PTC heat
generator and for generating the heat respectively, such that when
the air passes through the PTC heat generator, the air is heated up
before exiting the housing.
Inventors: |
Gao; Tianyu; (Shenzhen,
CN) |
Correspondence
Address: |
Raymond Y. Chan
Suite 128, 108 N. Ynez Avenue
Monterey Park
CA
91754
US
|
Family ID: |
39463822 |
Appl. No.: |
11/606708 |
Filed: |
November 29, 2006 |
Current U.S.
Class: |
392/365 |
Current CPC
Class: |
F24H 9/1872 20130101;
F24H 9/2071 20130101; F24H 3/0417 20130101 |
Class at
Publication: |
392/365 |
International
Class: |
F24H 3/02 20060101
F24H003/02; F24D 15/02 20060101 F24D015/02 |
Claims
1-20. (canceled)
21. An airflow heater, comprising: a housing; a control arrangement
supported at an upper portion of said housing; an air source
supported within said housing for generating a flow of air; a PTC
heat generator supported within said housing at a position in front
of said air source for generating heat, and a terminal unit which
comprises at least an upward terminal connector upwardly extended
from said PTC heat generator to align with said control arrangement
and at least a sideward terminal connector rearwardly extended from
said PTC heat generator to minimize a distance between said
terminal unit and said control arrangement for electrical
connection, wherein said upward terminal connector and said
sideward terminal connector are electrically connected to said
control arrangement, wherein said air source and said PTC heat
generator are activated by said control arrangement for generating
said air towards said PTC heat generator and for generating said
heat respectively, such that when said air passes through said PTC
heat generator, said air is heated up before exiting said housing,
wherein said control arrangement comprises a control unit supported
at said upper portion of said housing at a position above said PTC
heat generator to electrically connect to said upward terminal
connector, and a temperature control supported at said upper
portion of said housing at a position above said sideward terminal
connector to electrically connect to said sideward terminal
connector.
22. The airflow heater, as recited in claim 21, wherein said upward
terminal connector and said sideward terminal connector are
integrally extended from a top side and a rear side of said PTC
heat generator respectively.
23. The airflow heater, as recited in claim 21, wherein said upward
terminal connector and said sideward terminal connector are affixed
to a top side and a rear side of said PTC heat generator
respectively.
24. The airflow heater, as recited in claim 21, wherein said PTC
heat generator comprises at least a heat column having two side
surfaces, at least two dissipating units sidewardly extended from
said two side surfaces of said heat column, two inner retention
walls mounted at said side surfaces of said heat column at a
position that each of said inner retention wall is sandwiched
between said heat column and said respective heat dissipating unit,
and two outer retention walls mounted at two outer sides of said
heat dissipating units respectively, wherein when said heat column
is activated to generate said heat, said heat is transmitted to
said heat dissipating units through said inner retention walls for
heat dissipation.
25. The airflow heater, as recited in claim 22, wherein said PTC
heat generator comprises at least a heat column having two side
surfaces, at least two dissipating units sidewardly extended from
said two side surfaces of said heat column, two inner retention
walls mounted at said side surfaces of said heat column at a
position that each of said inner retention wall is sandwiched
between said heat column and said respective heat dissipating unit,
and two outer retention walls mounted at two outer sides of said
heat dissipating units respectively, wherein when said heat column
is activated to generate said heat, said heat is transmitted to
said heat dissipating units through said inner retention walls for
heat dissipation.
26. The airflow heater, as recited in claim 23, wherein said PTC
heat generator comprises at least a heat column having two side
surfaces, at least two dissipating units sidewardly extended from
said two side surfaces of said heat column, two inner retention
walls mounted at said side surfaces of said heat column at a
position that each of said inner retention wall is sandwiched
between said heat column and said respective heat dissipating unit,
and two outer retention walls mounted at two outer sides of said
heat dissipating units respectively, wherein when said heat column
is activated to generate said heat, said heat is transmitted to
said heat dissipating units through said inner retention walls for
heat dissipation.
27. The airflow heater, as recited in claim 24, wherein said upward
terminal connector is upwardly extended from a top edge of one of
said retention walls and said sideward terminal connector is
rearwardly extended from a rear edge of another said retention
walls.
28. The airflow heater, as recited in claim 25, wherein said upward
terminal connector is upwardly extended from a top edge of one of
said retention walls and said sideward terminal connector is
rearwardly extended from a rear edge of another said retention
walls.
29. The airflow heater, as recited in claim 26, wherein said upward
terminal connector is upwardly extended from a top edge of one of
said retention walls and said sideward terminal connector is
rearwardly extended from a rear edge of another said retention
walls.
30. The airflow heater, as recited in claim 28, wherein said PTC
heat generator further has two adhering films provided on said two
side surfaces of said heat column respective to affix said inner
retention walls thereto, wherein said heat column further has a
plurality of electrodes formed at said side surfaces thereof to
electrically conduct with said inner retention walls.
31. The airflow heater, as recited in claim 29, wherein said PTC
heat generator further has two adhering films provided on said two
side surfaces of said heat column respective to affix said inner
retention walls thereto, wherein said heat column further has a
plurality of electrodes formed at said side surfaces thereof to
electrically conduct with said inner retention walls.
32. The airflow heater, as recited in claim 30, wherein said PTC
heat generator further has an electrode element integrally affixed
on said side surfaces of said heat column to form said electrodes
having a sharp tip such that when said inner retention wall is
overlapped on said respective side surface of said heat column,
said electrodes penetrate through said respective adhering film to
conductively contact with said inner retention wall.
33. The airflow heater, as recited in claim 31, wherein said PTC
heat generator further has an electrode element integrally affixed
on said side surfaces of said heat column to form said electrodes
having a sharp tip such that when said inner retention wall is
overlapped on said respective side surface of said heat column,
said electrodes penetrate through said respective adhering film to
conductively contact with said inner retention wall.
34. The airflow heater, as recited in claim 32, wherein each of
said heat dissipating unit comprises an elongated heat dissipating
element bent in a Zigzag structure to form a plurality of heat
dissipating panels and to define a heat dissipating channel between
every said two heat dissipating panels for said air passing
therethrough, wherein two side edges of each of said heat
dissipating panels are affixed between said two retention
walls.
35. The airflow heater, as recited in claim 33, wherein each of
said heat dissipating unit comprises an elongated heat dissipating
element bent in a Zigzag structure to form a plurality of heat
dissipating panels and to define a heat dissipating channel between
every said two heat dissipating panels for said air passing
therethrough, wherein two side edges of each of said heat
dissipating panels are affixed between said two retention
walls.
36. The airflow heater, as recited in claim 21, further comprising
a supporting bracket, which is supported in said housing, having a
front portion for said PTC heat generator mounting thereto and a
rear portion for said air source mounting thereto so as to retain
said PTC heat generator in front of said air source, wherein said
air source comprises a motor mounted at said rear portion of said
supporting bracket and a fan blade driven by said motor to rotate,
such that when said fan blade is rotated to generate airflow, said
air passes through said supporting bracket to said PTC heat
generator.
37. The airflow heater, as recited in claim 34, further comprising
a supporting bracket, which is supported in said housing, having a
front portion for said PTC heat generator mounting thereto and a
rear portion for said air source mounting thereto so as to retain
said PTC heat generator in front of said air source, wherein said
air source comprises a motor mounted at said rear portion of said
supporting bracket and a fan blade driven by said motor to rotate,
such that when said fan blade is rotated to generate airflow, said
air passes through said supporting bracket to said PTC heat
generator.
38. The airflow heater, as recited in claim 35, further comprising
a supporting bracket, which is supported in said housing, having a
front portion for said PTC heat generator mounting thereto and a
rear portion for said air source mounting thereto so as to retain
said PTC heat generator in front of said air source, wherein said
air source comprises a motor mounted at said rear portion of said
supporting bracket and a fan blade driven by said motor to rotate,
such that when said fan blade is rotated to generate airflow, said
air passes through said supporting bracket to said PTC heat
generator.
Description
BACKGROUND OF THE PRESENT INVENTION
[0001] 1. Field of Invention
[0002] The present invention relates to a warmer, and more
particularly to a heat airflow heater which uses an advance heat
generating connector structure so as to reduce the overall material
cost and to simplify the assembling configuration.
[0003] 2. Description of Related Arts
[0004] A conventional warmer, as a common house appliance, is
adapted for generating a flow of heated air. Heated air is blown
out to the environment such a room can be kept at a comfortable
temperature. The warmer usually uses a heat generator as a heat
source which is embodies as one of an electric wire having a
predetermined resistance, a heat generating panel, and a heat
generating tube for generating heat. Such a conventional warmer
does not have a heat controller function. Therefore, the life span
of the warmer is relatively short and it is easy to malfunction and
is not safe to use. Another type of conventional warmer uses a PTC
(Positive Temperature Coefficient) heat generator and it is more
efficient, reliable, and convenient. The PTC ceramic heater has a
conducting function of using the positive temperature coefficient
materials. Positive Temperature Coefficient (PTC) refers to
materials that experience an increase in electrical resistance when
the temperature is raised. Materials which have useful engineering
applications usually show a relatively rapid increase with
temperature, i.e. a higher coefficient. The higher the coefficient,
the greater an increase in electrical resistance for a given
temperature increase. Using this characteristic of the PTC, many
applications of PTC heating devices can be manufactured.
[0005] Such ceramic heater uses PTC heat generator which comprises
metal heat dissipating unit installed on two sides of the heat
generator. When the PTC heat generator generates heat, the heat is
conducted to the heat dissipating unit and is then radiated to the
surrounding through the heat dissipating unit. A fan which is
supported behind the heat dissipating unit, generates a flow of air
towards the heat dissipating unit such that when the flow of air
passes through the heat dissipating unit, the flow of air is heated
to become a heated air to exit at a front side of the ceramic
heater. The PTC heat generator further comprises a temperature
control supported on top of the ceramic heater to control the heat
generated from the PTC heat generator. Accordingly, the housing of
the ceramic heater receives a control circuit and a switch to
control the temperature control.
[0006] Since most of the temperature control is provided on top of
the housing, the space for disposing the PTC heat generator is
relatively restricted, especially for the terminal of the PTC heat
generator. Therefore, the terminal of such conventional ceramic
heater is installed at the bottom side of the housing to
electrically connect to the temperature control via an electric
wire. Since the electric wire is extended from the bottom side of
the housing to the top thereof, the relatively long electric wire
is needed for electrical connection. Therefore, it is a waste of
the electric wire for only electrical connection and the electric
wire takes the space of the housing. In other words, the housing
must be designed to have a bigger space in order to incorporate
with the electric wire. In addition, such electric wire increases
the failure of the ceramic heater since the electrical wire is
routed.
SUMMARY OF THE PRESENT INVENTION
[0007] A main object of the present invention is to provide an
airflow heater with an advanced heat generating arrangement
structure so that the length of the electric wire usage can be
minimized. In other words, the overall size of the housing is also
reduced by minimizing the space thereof for wiring connection.
[0008] Another object of the present invention is to provide an
airflow heater which is capable to provide a safe and reliable
airflow output.
[0009] Another object of the present invention is to provide an
airflow heater which does not involve complicated mechanical
structures, so as to minimize the manufacturing cost and other
related expenses of the airflow heater.
[0010] Accordingly, in order to accomplish the above objects, the
present invention provides an airflow heater, comprising:
[0011] a housing;
[0012] a control arrangement supported at an upper portion of the
housing;
[0013] an air source supported within the housing for generating a
flow of air;
[0014] a PTC heat generator supported within the housing at a
position in front of the air source for generating heat, and
[0015] a terminal unit which comprises at least an upward terminal
connector upwardly extended from the PTC heat generator to align
with the control arrangement and at least a sideward terminal
connector rearwardly extended from the PTC heat generator to
minimize a distance between the terminal unit and the control
arrangement for electrical connection, wherein the upward terminal
connector and the sideward terminal connector are electrically
connected to the control arrangement, wherein the air source and
the PTC heat generator are activated by the control arrangement for
generating the air towards the PTC heat generator and for
generating the heat respectively, such that when the air passes
through the PTC heat generator, the air is heated up before exiting
the housing.
[0016] These and other objectives, features, and advantages of the
present invention will become apparent from the following detailed
description, the accompanying drawings, and the appended
claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is a perspective view of a PTC heat generator of a
PTC airflow heater according to a preferred embodiment of the
present invention.
[0018] FIG. 2 is an exploded perspective view of internal
components of the PTC airflow heater according to the above
preferred embodiment of the present invention.
[0019] FIG. 3 is a sectional view of the PTC airflow heater
according to the above preferred embodiment of the present
invention.
[0020] FIG. 4 is an exploded perspective view of the PTC heat
generator according to the above preferred embodiment of the
present invention.
[0021] FIG. 5 is a front perspective view of the PTC airflow heater
according to the above preferred embodiment of the present
invention, illustrating the PTC heat generator mounting in the
housing without the front casing.
[0022] FIG. 6 is a rear perspective view of the PTC airflow heater
according to the above preferred embodiment of the present
invention, illustrating the PTC heat generator and the fan mounting
in the housing without the rear casing.
[0023] FIG. 7 is an exploded perspective view of the PTC airflow
heater according to the above preferred embodiment of the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0024] Referring to FIGS. 1 to 7 of the drawings, a PTC airflow
heater according to a preferred embodiment of the present invention
is illustrated, wherein the PTC airflow heater comprises a housing
70, a PTC heat generator 10 received in the housing 70, a n air
source supported in the housing 70 at a position behind the PTC
heat generator 10 for generating a flow of air towards the PTC heat
generator. The PTC airflow heater further comprises a control
arrangement supported at an upper portion of the housing 70 to
control the PTC heat generator 10.
[0025] As shown in FIG. 7, the housing 70 comprises a front casing
71 and a rear casing 72 mounted thereto to define a receiving
cavity between the front and rear casings 71, 72.
[0026] The air source comprises a fan blade 60 and a motor 50
driving the fan blade 60 via an output shaft to rotate so as to
generate a flow of air towards the PTC heat generator 10. The
control arrangement comprises a control unit 80 electrically
connected between a power source and the PTC heat generator 10 and
a control interface 90 connected to the control unit 80 such that a
user is able to manually control the control unit 80 to operate the
PTC airflow heater of the instant invention.
[0027] The PTC heat generator, as shown in FIGS. 1 and 4, comprises
a heat generating unit 10, a terminal unit 20, and a supporting
frame 30. The heat generating unit 10 comprises a heat column 11
for generating heat, a heat dissipating arrangement 12 for
dissipating the heat from the heat column 11, and a plurality of
metal made retention walls 13, 14.
[0028] Accordingly, the heat dissipating arrangement 12 comprises
two metal made dissipating units 121 sidewardly extended from two
side surfaces of the heat column 11 such that the heat column 11 is
positioned between the two dissipating units 121 to thermally
conduct the heat from the heat column 11 to the dissipating units
121. Therefore, when the heat column 11 is activated to generate
the heat, the heat is transmitted to the heat dissipating units 121
through the inner retention walls 13 for heat dissipation.
[0029] Two inner retention walls 13 are mounted at the side
surfaces of the heat column 11 respectively. Each of the inner
retention walls 13 is mounted between the heat column 11 and the
respective dissipating unit 121, wherein when the heat generated
from the heat column 11, the heat is thermally conducted to the
dissipating units 121 through the inner retention walls 13. Two
adhering films 100 are formed on two side surfaces of the heat
column 11 to affix the two inner retention walls 13 at the side
surfaces of the heat column 11 respectively. Accordingly, the two
inner retention walls 13 are adhered to the two side surfaces of
the heat column 11 via a high heat resisting adhesive to form the
adhering films 100.
[0030] It is worth to mention that the length of the heat column 11
is made of PTC (Positive Temperature Coefficient) material adapted
for generating the heat. In addition, the length of the heat column
11 is shorter than a length of each of the inner retention walls
13, such that two or more heat columns 11 can be aligned to be
sandwiched between the two inner retention walls 13. As shown in
FIG. 4, four heat columns 11 are aligned to mount between the inner
retention walls 13.
[0031] The two outer retention walls 14 are mounted at two outer
sides of the heat dissipating units 121 respectively to protect the
heat dissipating units 121 from physical damages.
[0032] The heat column 11 further has a plurality of electrodes 111
formed at the side surfaces thereof to electrically conduct with
the inner retention walls 13. Accordingly, in order to form the
electrodes 111 on the side surfaces of the heat column 11, an
electrode element is coated or sprayed on the side surfaces of the
heat column 11. The electrode element can be made of aluminum or
sliver provided on the side surfaces of the heat column 11 to form
the electrodes 111 having a sharp tip such that when the inner
retention wall 13 is overlapped on the respective side surface of
the heat column 11, the electrodes 111 penetrate through the
adhering film 100 to conductively contact with the inner retention
wall 13. It is worth to mention that when the electrode element is
evenly coated or sprayed on the side surfaces of the heat column
11, the respective side surface of the heat column 11 forms a rough
surface that a plurality of protruding points are randomly
protruded from the side surface of the heat column 11 such that the
protruding points form the electrodes 111 to contact with the
respective inner retention wall 13 through the adhering film
100.
[0033] Each of the heat dissipating unit 121 comprises an elongated
heat dissipating element bent in a Zigzag structure to form a
plurality of heat dissipating panels 1211, wherein two side edges
of each of the heat dissipating panels 1211 are affixed to the
inner and outer retention walls 13, 14 respectively, preferably by
welding. A heat dissipating channel is defined between every two
heat dissipating panels 1211 for the air passing through.
Accordingly, the heat dissipating element is made of metal material
having high heat transfer coefficient, such as aluminum alloy, for
dissipating the heat to the surrounding. The heating dissipating
channels are aligned with the fan 60 such that when the fan 60
generates the flow of air, the air is adapted to pass through the
heating dissipating channels. Each of the heating dissipating
channels has a triangular or trapezoid cross section such that when
the air passes through the heat dissipating channels, the air is
heated up when the heat dissipating panels 1211 dissipate the heat
therefrom.
[0034] It is worth to mention that the heat column 11, two heat
dissipating units 121, two inner retention walls 13, and two outer
retention walls 14 are formed as one set of heat generating unit
10. Two or more sets can be selectively combined to enhance the
heat dissipating ability of the heat generator 10. As shown in
FIGS. 1 and 4, four sets are combined, including a plurality of
heat columns 11, eight heat dissipating units 121, eleven inner
retention walls 13, and two outer retention walls 14, to form the
heating generating unit 10. It is worth to mention that the
retention wall is a common wall to mount between the two heat
dissipating units 121 at every two sets. Therefore, multiple sets
of the heat generating unit 10 are adapted for amplifying the heat
dissipating function. In other words, the multiple sets of the heat
generating unit 10 have a larger heating coverage area.
[0035] The terminal unit 20 comprises at least a sideward terminal
connector 21 rearwardly extended from one of the inner retention
walls 13 and at least an upward terminal connector 22 upwardly
extended from another inner retention wall 13. Accordingly, the
sideward terminal connector 21 and the upward terminal connector 22
are extended from a rear side and a top side of the PTC heat
generator 10 respectively. The sideward terminal connector 21 and
the upward terminal connector 22 are electrically coupled with the
control unit 80 via electric wires. Accordingly, the control unit
80 has an "on" and "off" function to control the PTC heat generator
10 in an ON and OFF manner. The control interface 90 is connected
to the control unit 80 such that the user can manually control the
control unit 80 mechanically to operate the function of the present
invention such as the heat intensity or the airflow rate. The power
source provides power to the PTC heat generator 10 through the
terminal unit 20.
[0036] Accordingly, the upward terminal connector 22 and the
sideward terminal connector 21 are extended from the PTC heat
generator 10 to minimize a distance between the terminal unit 20
and the control arrangement for electrical connection, wherein the
air source and the PTC heat generator 10 are activated by the
control arrangement for generating the air towards the PTC heat
generator 10 and for generating the heat respectively, such that
when the air passes through the PTC heat generator 10, the air is
heated up before exiting the housing 70.
[0037] As shown in FIGS. 1 to 4, there are four upward terminal
connectors 22 upwardly extended from four inner retention walls 13
respectively, wherein the upward terminal connectors 22 are
upwardly extended to align with the main control 80 such that a
relatively short electric wire is used for electrically connecting
the main control 80 with each of the upward terminal connectors 22.
Accordingly, each of the upward terminal connectors 22, which can
be made of aluminum, is integrally extended from an upper edge of
the respective inner retention wall 13. Alternatively, each of the
upward terminal connectors 22 can be affixed, by welding or by
rivet, to the upper edge of the respective inner retention wall 13.
Once the control unit 80 is activated, the control unit 80 is
electrically connected to the PTC heat generator 10 via the upward
terminal connectors 22, such that the heat column 11 is
electrically actuated through the inner retention walls 13 via the
electrodes 111 for generating the heat and for thermally conducting
the heat to the heat dissipating units 121.
[0038] The control arrangement further comprises a temperature
control 40, which is arranged for controlling the temperature of
the heat column 11, supported the upper portion of the housing 70
to operatively connect to the sideward terminal connector 21. Since
the control unit 80 is supported on top of the PTC heat generator
10, the space for making a connecting between the temperature
control 40 and the PTC heat generator 10 is restricted. The
sideward terminal connector 21 is perpendicularly extended from a
rear edge of an upper portion of the respective inner retention
wall 13 at a position to align with the temperature control 40. In
other words, the temperature control 40 is supported at the upper
portion of the housing 70 at a position above the sideward terminal
connector 21 to minimize a distance therebetween for electrically
connecting to the sideward terminal connector 21.
[0039] Accordingly, the sideward terminal connector 21, which can
be made of aluminum, is integrally extended from the rear edge of
the respective inner retention wall 13. Alternatively, the sideward
terminal connector 21 can be affixed, by welding or by rivet, to
the rear edge of the respective inner retention wall 13. It is
worth to mention that an electric wire 23 is electrically connected
the sideward terminal connector 21 to the temperature control
40.
[0040] The supporting frame comprises a supporting bracket 30
having a front portion for the PTC heat generator 10 mounting
thereto and a rear portion for the motor 50 mounting thereto such
that when the motor 50 is activated to drive the fan blade 60 to
rotate, the air passes through the supporting bracket 30 to the PTC
heat generator 10. The supporting bracket 30 has a through guiding
slot 31 formed at a position that when the PTC heat generator 10 is
mounted at the front portion of the supporting bracket 30, the side
terminal connector 21 is slidably passed through the guiding slot
31 to electrically connect to the temperature control 40 via the
electric wire 23.
[0041] FIG. 5 illustrates the position of the PTC heat generator 10
with respect to the rear casing 72, wherein the PTC heat generator
10 is supported at a position that the PTC heat generator 10 is
positioned below the main control 80. In addition, the supporting
bracket 30 further has a holding cavity 33 formed at the front
portion for receiving the PTC heat generator 10 and at least a
clipping arm 32 formed at a peripheral wall of the holding cavity
33 to detachably engage with at least one of the outer retention
walls 14. FIG. 6 illustrates the positions of the air source and
the PTC heat generator 10 with respect to the front casing 71.
Accordingly, the PTC heat generator 10 is supported at the front
casing 71 of the housing 70 at a position that the PTC heat
generator 10 is aligned with an air outlet of the front casing 71
such that when the air passes through the PTC heat generator 10,
the air is heated up to become a heated air to be exited through
the air outlet.
[0042] It is worth to mention that the upward terminal connectors
22 and the sideward terminal connector 21 are extended in a
location close to the control unit 80 and the temperature control
40. Therefore, this design minimizes the length of the electric
wires used for connecting the PTC heat generator 10 with the
control unit 80 and the temperature control 40. It does not involve
complicated mechanical structures so as to minimize the
manufacturing cost and other related expenses of the airflow
heater.
[0043] One skilled in the art will understand that the embodiment
of the present invention as shown in the drawings and described
above is exemplary only and not intended to be limiting.
[0044] It will thus be seen that the objects of the present
invention have been fully and effectively accomplished. It
embodiments have been shown and described for the purposes of
illustrating the functional and structural principles of the
present invention and is subject to change without departure from
such principles. Therefore, this invention includes all
modifications encompassed within the spirit and scope of the
following claims.
* * * * *