[0001] The invention relates to a board eraser including a compact structure and a light
weight.
[0002] Typical board erasers comprise the following kinds:
First, Taiwanese Patent Application No. 83213896 is entitled "disposable endless belt board eraser" and includes an endless rubbing
cloth having an inner protruded rib extended therefrom, and each roller having a groove
formed therein, for engaging with the inner protruded rib of the rubbing cloth, and
for preventing the rubbing cloth from moving laterally when erasing the dust from
the blackboard, and for increasing the frictional engagement between the rubbing cloth
and the rear roller, and when forcing the board eraser onto the blackboard to move
the rubbing cloth, the rear roller may be rotated by the rubbing cloth and the inner
protruded rib, and the rear roller has two side transmission belts for rotating a
dust loosening brush, and for forcing the dust loosening brush to move in a direction
opposite to the rubbing cloth, and for removing the dust from the rubbing cloth and
collected in a casing, however, the application has the following drawbacks:
- 1. the rollers include a curved structure and include a line-contact with the rubbing
cloth and the rubbing cloth may be curved into the rollers such that the rubbing cloth
may not be easily cleaned by the dust loosening brush.
- 2. the rubbing cloth may be curved and engaged into the curved rollers and may have
a small contact area with the blackboard and thus may not suitably erase the dust
from the blackboard.
- 3. the dust removed from the rubbing cloth will be collected in a casing, but the
dust may flow into the air when moving the board eraser such that the dust may be
breathed by people.
Second, Taiwanese Patent Application No. 87206860 is entitled "vacuum board eraser" and includes a number of partitions disposed in
a casing for positioning a rubbing cloth, and a spherical port for coupling to a joint
of a vacuum device, and a remote control device disposed on the casing, however, the
application has the following drawbacks:
- 1. the dust may be sticked onto the rubbing cloth such that the rubbing cloth may
not be used to suitably erase the blackboard.
- 2. the dust may be sticked onto the rubbing cloth and may not be suitably vacuumed
by the vacuum device unless the vacuum device includes a stronger power.
- 3. the vacuum device is coupled to the board eraser with a hose which may increase
the weight of the board eraser and may interfere the erasing operation of the board
eraser.
Third, Taiwanese Patent Application No. 91221547 is entitled "improved board eraser"
and includes the following drawbacks:
- 1. the dust may be sticked onto the rubbing cloth and may flow into the air when moving
the board eraser such that the dust may be breathed by people.
- 2. the board eraser includes a vacuum device coupled to a hose for drawing and collecting
the dust into the vacuum device, however, the hose may increase the weight of the
board eraser and may interfere the erasing operation of the board eraser.
[0003] The inventor is to overcome the drawbacks and to develop the vacuum board eraser
of the invention.
[0004] The invention is to provide a vacuum board eraser including a compact structure and
a light weight.
[0005] The invention provides a vacuum board eraser comprising a receptacle including a
chamber and a compartment formed on the upper portion and communicating with the chamber,
a brush engaged into the chamber of the receptacle and disposed beside the communicating
portion of the chamber and the compartment; a frame secured in the chamber of the
receptacle, and including two rollers, and a rubbing cloth engaged around the rollers
and engageable with the brush; a fan device engaged into the compartment and a motor
coupled to the fan device for driving the fan device; a container attached to the
receptacle and disposed between the chamber and the compartment, and the fan device
draws the dust from the chamber of the receptacle into the container.
[0006] The receptacle includes two rails, the container includes two side tracks for engaging
with the rails and for detachably attaching the container to the receptacle, and a
dust net engaged into the container for collecting the dust. A cover is disposed on
top of the compartment of the receptacle and a switch disposed on the cover, and a
battery disposed in the compartment of the receptacle. One or more conductors are
disposed on the receptacle and coupled to the battery for electrically coupling to
a charging base. The frame includes two flaps each having an oblong hole for slidably
receiving end blocks of spindles of the rollers, and a spring engaged with the end
blocks of the spindles The receptacle includes a rim attached to the peripheral portion
of the chamber of the receptacle and made of soft materials.
FIGS. 1, 2 are partial exploded views of a board eraser;
FIG. 3 is a perspective view of a roller supporting device,
FIG. 4 is a bottom perspective view of the board eraser;
FIG. 5 is a cross sectional view;
FIG. 6 is a side plan view of the vacuum board eraser; and
FIG. 7 is a partial exploded view of the vacuum board eraser.
Reference numerals:
[0007]
- 10
- receptacle
- 11
- chamber
- 110
- opening
- 12
- space
- 120
- rail
- 13
- compartment
- 130
- entrance
- 14
- conductor
- 15
- orifice
- 16
- cover
- 17
- switch
- 20
- brush
- 30
- rubbing cloth
- 40
- roller
- 50
- spindle
- 500
- end block
- 51
- spring
- 52
- fastener
- 60
- frame
- 61
- gap
- 62
- flap
- 63
- oblong hole
- 70
- rim
- 80
- fan deice
- 81
- motor
- 82
- battery
- 90
- container
- 900
- side track
- 901
- space
- 902
- inlet
- 903
- open end
- 91
- dust bag or net
- 910
- coupler
- A
- charging base
[0009] Referring to FIGS. 1-4, a vacuum board eraser comprises a receptacle 10, a brush
20, four rollers 40, a frame 60, a rubbing cloth 30, a rim 70, a fan device 80 and
a container 90, wherein:
the receptacle 10 includes a chamber 11 opened downwardly, a space 12 and a compartment
13 formed on the upper portion, an opening 110 communicating with the space 12, two
sets of orifices 15 formed in two sides, two rails 120 disposed on two sides of the
space 12, an entrance 130 communicating the compartment 13 with the space 12, conductors
14 disposed on one side of the compartment 13, a cover 16 disposed on top of the receptacle
10 and having a switch 17;
the brush 20 is planar and attached in the chamber 11 of the receptacle 10 and disposed
beside the opening 110 for contacting with one side of the rubbing cloth 30;
the rollers 40 are rotatably disposed in the frame 60 with spindles 50, and the outer
spindle 50 has two end blocks 500 each engaged with a spring 51;
the frame 60 includes two flaps 62 for securing to the orifices 15 of the receptacle
10 with fasteners 52, and four gaps 61 for receiving the rollers 40, the flaps 62
each include an oblong hole 63 for slidably receiving the end blocks 500 of the outer
spindle 50 and for receiving the spring 51;
the rubbing cloth 30 is engaged around the rollers 40 and confined between the flaps
62 of the frame 60 for preventing the rubbing cloth 30 from being disengaged from
the rollers 40;
the rim 70 is made of soft materials for attaching to the peripheral portion of the
chamber 11 of the receptacle 10, and the rim 70 may prevent the blackboard from being
scratched by the board eraser;
the fan device 80 is disposed in the compartment 13 and coupled to a motor 81 which
may actuate the fan device 80 to draw the air and the dust through the entrance 130,
four batteries 82 disposed in the compartment 13 for energizing the motor 81 and coupled
to the conductors 14 for electrically coupling to a charging base A (FIG. 7);
the container 90 includes two side tracks 900 for engaging with the rails 120 and
for detachably attaching the container 90 to the receptacle 10, and includes a space
901 and an inlet 902 communicating with the opening 110 of the receptacle 10 for communicating
with the chamber 11 of the receptacle 10, and includes an open end 903 for communicating
with the entrance 130 of the receptacle 10, a dust bag or net 91 is engaged into the
space 901 of the container 90 and includes a coupler 910 secured to the open end 903
of the space 901 of the container 90.
[0010] The rollers 40 and the spindles 50 may then be assembled and engaged into the frame
60 as shown in FIG. 3.
[0011] As shown in FIG. 4, the rubbing cloth 30 may erase the dust from the blackboard and
may be moved into the chamber 11 of the receptacle 10, and the brush 20 may scrub
the rubbing cloth 30 to remove the dust.
[0012] The switch 24 may be actuated to operate the fan device 80 which may draw the air
and the dust through the opening 110 of the receptacle 10 and into the container 90,
and the dust net 91 may block the dust to allow the dust to be collected in the container
90, and the container 90 may be easily disengaged from the receptacle 10 for dumping
the dust.
[0013] As shown in FIGS. 5 and 6, the springs 51 may bias the end blocks 500 of the outer
spindle 50 of the roller 40 at one end of the frame 60 to allow the roller 40 to be
moved to straighten the rubbing cloth 30.
[0014] As shown in FIG. 7, the board eraser may be engaged into the charging base A which
may charge the batteries 82 that are engaged in the compartment 13 of the receptacle
10.
[0015] The cover 16 may be disposed on top of the compartment 13 of the receptacle 10, and
the batteries 82 may be changed with the new ones by opening the cover 16, after the
batteries 82 have been consumed.
[0016] The receptacle 10 may include an electric cable coupled to the batteries 82 for energizing
the batteries 82.
[0017] The invention has the following advantages:
- 1. the rubbing cloth 30 is supported by the frame 60 and engageable with the brush
20 for allowing the rubbing cloth 30 to have a greater contact area with the blackboard.
- 2. the dust removed from the rubbing cloth 30 by the brush 20 may be collected within
the container 90 by the fan device 80.
- 3. the fan device 80 is disposed in the receptacle 10 and will not interfere the operation
of the board eraser.
[0018] The board eraser is not limited to the embodiment as shown in the drawings, but include
the changing of the invention.
1. A board eraser
characterized in that, comprising:
a receptacle includes a chamber and a compartment formed on the upper portion and
communicating with the chamber;
a brush engaged into the chamber of the receptacle and disposed beside the communicating
portion of the chamber and the compartment;
a frame secured in the chamber of the receptacle, and including two rollers, and a
rubbing cloth engaged around the rollers and engageable with the brush;
a fan device engaged into the compartment and a motor coupled to the fan device for
driving the fan device;
a container attached to the receptacle and disposed between the chamber and the compartment,
and the fan device draws the dust from the chamber of the receptacle into the container.
2. The board eraser as claimed in claim 1, wherein the receptacle includes two rails,
the container includes two side tracks for engaging with the rails and for detachably
attaching the container to the receptacle, and a dust net engaged into the container
for collecting the dust.
3. The board eraser as claimed in claim 1, wherein a cover is disposed on top of the
compartment of the receptacle and a switch disposed on the cover, and a battery disposed
in the compartment of the receptacle.
4. The board eraser as claimed in claim 3, wherein conductors are disposed on the receptacle
and coupled to the battery for electrically coupling to a charging base.
5. The board eraser as claimed in claim 1, wherein the frame includes two flaps each
having an oblong hole for slidably receiving end blocks of spindles of the rollers,
and a spring engaged with the end blocks of the spindles.
6. The board eraser as claimed in claim 1, wherein the receptacle includes a rim attached
to the peripheral portion of the chamber of the receptacle and made of soft materials.