U.S. patent application number 09/934523 was filed with the patent office on 2003-02-27 for electronic blackboard eraser.
Invention is credited to Wu, Tung Ming, Yeh, Robert.
Application Number | 20030037404 09/934523 |
Document ID | / |
Family ID | 25465686 |
Filed Date | 2003-02-27 |
United States Patent
Application |
20030037404 |
Kind Code |
A1 |
Wu, Tung Ming ; et
al. |
February 27, 2003 |
Electronic blackboard eraser
Abstract
An electronic blackboard eraser consists of an erasing unit, a
control unit having a driving element and an air fan set, and a
filter unit located between the erasing unit and the control unit.
The erasing unit has an erasing surface mounted with a plurality of
erasing elements formed in strips for erasing blackboards. In
addition to erasing the blackboards, this invention can also
collect dust and powder.
Inventors: |
Wu, Tung Ming; (Hsin-Chuang
City, TW) ; Yeh, Robert; (Hsin-Chuang City,
TW) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE
FOURTH FLOOR
ALEXANDRIA
VA
22314
|
Family ID: |
25465686 |
Appl. No.: |
09/934523 |
Filed: |
August 23, 2001 |
Current U.S.
Class: |
15/344 |
Current CPC
Class: |
B43L 21/02 20130101 |
Class at
Publication: |
15/344 |
International
Class: |
A47L 005/24 |
Claims
What is claimed is:
1. An electronic blackboard eraser for erasing blackboards and
collecting dust and powder, comprising: an erasing unit having a
compartment containing a first dust suction member, and an erasing
surface mounted with a plurality of erasing elements, the erasing
elements having a plurality of suction inlets formed therebetween;
a control unit having a housing space for holding a driving element
and an air fan set mounted below the driving element; and a filter
unit located between the erasing unit and the control unit
including a housing chamber for holding the air fan set.
2. The electronic blackboard eraser of claim 1, wherein the driving
element is a DC motor.
3. The electronic blackboard eraser of claim 1, wherein the air fan
set is a centrifugal fan.
4. The electronic blackboard eraser of claim 1, wherein the air fan
set is an axial flow fan.
5. The electronic blackboard eraser of claim 1, wherein power
supply for the driving element is a storage battery.
6. The electronic blackboard eraser of claim 1, wherein power
supply for the driving element is a dry battery.
7. The electronic blackboard eraser of claim 1, wherein the
periphery of the driving element is surrounded by an isolation
cotton for reducing noise generated by the driving element during
operation.
8. The electronic blackboard eraser of claim 1, wherein the filter
unit further has two holding spaces located at two sides of the
housing chamber for holding respectively a second dust suction
member for adsorbing dust and powder escaping the first dust
suction member of the erasing unit.
9. The electronic blackboard eraser of claim 1, wherein the erasing
elements on the erasing surface are selectively configured in the
form of strips, circular, rectangular, saw patterns, or undulated
patterns.
10. The electronic blackboard eraser of claim 1, wherein the
periphery of the erasing surface has a plurality of suction
inlets.
11. The electronic blackboard eraser of claim 1, wherein the first
and the second dust suction member are made of washable and
reusable materials including sponge.
12. The electronic blackboard eraser of claim 1, wherein the
suction inlets are formed in grid or grate shapes.
13. The electronic blackboard eraser of claim 1, wherein the
peripheral sides of the erasing unit has a plurality of latch lugs
and straps for fastening the control unit and the filter unit and
the erasing unit securely.
14. The electronic blackboard eraser of claim 1, wherein the
peripheral sides of the erasing unit, the control unit, and the
filter unit have respectively snap latches for engaging the erasing
unit, the control unit and the filter unit together.
15. The electronic blackboard eraser of claim 14, wherein the snap
latches are matching tenons and latch notches.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to an electronic blackboard
eraser and particularly an electronic eraser equipped with dust
collecting function and operating with reduced noise.
BACKGROUND OF THE INVENTION
[0002] There are generally two types of blackboard erasers now
being commonly used, i.e. traditional ones and electronic ones.
Traditional blackboard erasers incur dust during use and threaten
people's health. People who have their hands smeared by dust for a
prolonged period of time are concerns about suffering from skin
cancer. People expose to the dust for a long period time also could
result in serious suffering from respiratory system. Moreover,
traditional blackboard erasers are not very effective. The eraser
surface has to be cleared and cleaned frequently.
[0003] To remedy aforesaid problems, there are electronic
blackboard erasers being developed and marketed. However the
erasing and dust collecting effects of those electronic blackboard
erasers are still not satisfactory. Their erasing units usually
have erasing elements located around an erasing plane and the
erasing plane has only one dust suction opening. The erasing result
is not desirable. A lot of dust will be generated during erasing,
and dust collection effect is also not satisfactory. Moreover,
conventional electronic blackboard erasers do not have noise
isolation features. As a result, a lot of noise is generated during
use. In view of the contemporary product design trends of focusing
on lower pollution and lower noise, the blackboard erasers now
available on the market are mostly not conforming to environmental
protection requirements.
SUMMARY OF THE INVENTION
[0004] The primary object of the invention is to resolve the
foregoing disadvantages. The invention aims to provide an
electronic blackboard eraser that includes an erasing unit, a
control unit having a driving element and an air fan set, and a
filter unit located between the erasing unit and the control unit.
The erasing unit has a compartment containing a first dust suction
member, and an erasing surface equipped with a plurality of erasing
elements formed in strips. There are a plurality of suction inlets
located at the periphery of the erasing surface and between the
erasing strips. The filter unit includes a housing chamber for
holding the air fan set and two holding spaces located at two sides
of the housing chamber for respectively holding a second dust
suction member. The driving element of the control unit is
surrounded by a noise isolation cotton for reducing the noise
generated during operation. The interfaces between various units
have snap latches for coupling the elements together. A strap is
provided to fasten all the units together securely and to save
assembly time.
[0005] The foregoing, as well as additional objects, features and
advantages of the invention will be more readily apparent from the
following detailed description, which proceeds with reference to
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a perspective view of the invention.
[0007] FIG. 2 is an exploded view of the invention.
[0008] FIG. 3 is a perspective view of an erasing unit of the
invention.
[0009] FIG. 4 is a schematic view of the invention in use for
sucking dust.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0010] Referring to FIGS. 1, 2, and 3, the invention consists of an
erasing unit 1, a control unit 2 and a filter unit 5 located
between the erasing unit 1 and the control unit 2.
[0011] The erasing unit 1 has a compartment 11 containing a first
dust suction member 12, and an erasing surface 13 with a plurality
of erasing elements 14 mounted thereon. There are a plurality of
suction inlets 131, 131' located between the erasing elements 14
and at the peripheral rim of the erasing surface 13. The erasing
elements 14 may be arranged in different configurations desired,
such as strips, circular, rectangular, saw patterns, or undulated
patterns (not shown in the drawings). The peripheral sides of the
compartment 11 have snap latches 15 (such as tenons or latch
notches) formed thereon. There are also two latch lugs 16 located
on the outside wall of the erasing unit 1 which may engage with
straps 17 for fastening the control unit 2 and the filter unit 5
tightly with the erasing unit 1.
[0012] The control unit 2 has a housing space 21 for holding a
driving element 3 (may be a DC motor) and an air fan set 4 (such as
a centrifugal fan or axial flow fan) mounted below the driving
element 3. The driving element 3 includes a power supply 31 (may be
a storage battery or dry battery) and a switch 32 located on an
upper cap 22. The driving element 3 is surrounded by a noise
isolation cotton 33 which may reduce noise and damp vibration for
effectively decreasing the noise generated by the driving element 3
during operation. The peripheral sides of the control unit 2 have
snap latches 23 (such as tenons or latch notches) formed
thereon.
[0013] The filter unit 5 includes a housing chamber 51 for holding
the air fan set 4 and two housing spaces 52 located at two sides of
the housing chamber 51 for respectively holding a second dust
suction member 53. The peripheral sides of the filter unit 5 have
two rows of snap latches 54, 55 (such as tenons or latch notches)
formed thereon to engage with the snap latches 15, 23 of the
erasing unit 1 and control unit 2.
[0014] The first and second dust suction member 12, 53 are made of
washable and reusable materials such as sponge and may be cleaned
and reused to conform to environmental protection requirements. The
suction inlets 131, 131' may be formed in grid or grate shapes.
[0015] The electronic blackboard eraser thus constructed is easy to
assemble, and provides dual effect for erasing and dust collecting,
and may be operated at a low noise level. It also is constructed
and fastened securely without the risk of falling apart when hit
incidentally.
[0016] Referring to FIG. 4, when in use for erasing, the erasing
elements 14 of the erasing unit 1 wipe and scrape the chalk writing
on the blackboard 6 to become dust and powder 7. As there is an
elevation difference between the erasing elements 14 and the
blackboard 7, the dust and powder 7 suspending between the erasing
elements 14 and the blackboard 7 will be drawn by the air fan set 4
and sucked through the suction inlets 131 formed between the
erasing elements 14, and adsorbed to the first dust suction member
12 located in the erasing unit 1. The dust and powder 7 that have
not been drawn to the suction inlets 131 will be drawn again by the
air fan set 4 and sucked through the suction inlets 131' around the
erasing surface 13 and also adsorbed to the first dust suction
member 12, thus form a double dust suction and collection effect.
The dust and powder 7 that escape the first dust suction member 12
will be drawn and adsorbed by the second dust suction members 53
located at two sides of the air fan set 4 of the filter unit 5.
[0017] By means of the construction set forth above, the electronic
blackboard eraser of the invention can effectively adsorb and
collect dust and powder incurred during erasing the blackboard and
prevent the dust and powder from dispersing in the air to protect
people's health. Moreover, the invention may be operated with
reduced noise.
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