Air purifier

Details Air purifier Air purifier

2001-10-23

2003-11-11

Smith, Duane (Department: 1724)

Gas separation

With gas flow effecting means

Impeller within or proximate to space encompassed by...

C055S506000, C055S508000, C055S486000, C055SDIG003, C096S397000, C096S417000, C096S421000, C439S640000, C439S654000

Reexamination Certificate

active

06645266

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an air purifier, and more particularly, to an air purifier, of which the plug is rotatably fitted to the main housing.
Air purifiers takes many forms such as a common large one, which is positioned on the floor and has a wire used for connecting the motor to the power supply, and a small-sized one, which has a plug directly connected to the main housing without the use of a wire. Because the wire of the common air purifier is likely to cause people to trip over it accidentally and the air purifier would take too much space in the house, the small-sized one is getting more and more popular.
Referring to
FIG. 6
, a conventional small-sized air purifier has a main body
1
, an air outlet grille
12
, a filtering net
11
, a motor
21
, a fan
22
, a rear housing
2
and a power plug
3
.
The air outlet grille
12
, and the filtering net
11
are secured to the front of the main body
1
. The motor
21
is also secured to the main body
1
, and is connected to the fan
22
from a rotatable shaft (not numbered). The rear housing
2
is joined to the rear side of the main body
1
.
The power plug
3
includes a pair of copper strips
35
and
36
, a shaft
30
, a casing consisting of two half parts
31
and
32
, and a pain of conductors
33
and
34
. The copper strips
35
and
36
are joined to the shaft
30
, and the half parts
31
and
32
of the casing are connected to each other to house the shaft
30
therein with two ends of each of the copper strips
35
and
36
sticking out therefrom. Referring to
FIG. 7
, the casing is rotatably received in a chamber
23
of the rear housing
2
, and the conductors
33
and
34
are secured to the bottom wall of the chamber
23
; the conductors
33
and
34
each has a straight portion projecting into the rear housing
2
so as to be electrically connected to the motor
21
. The conductors
33
and
34
each further has a conductive portion
331
and
341
abutting the bottom wall of the chamber
23
, the conductive portions
331
and
341
are each formed with an L-shape to get into contact with one of the copper strips
35
and
36
.
The motor
21
can be activated when the outer ends of the copper strips
35
and
36
are plugged into the power socket; thus, air can be forced to travel through the net
11
to be purified. The casing joined to the copper strips
35
and
36
can be turned relative to the rear housing
2
before the copper strips
35
and
36
are plugged into the socket, so as to permit the position of the air purifier to be adjusted according to the need. However, referring to
FIGS. 8 and 9
, the range of the adjustment is limited to an angle of about 90°, i.e. when the power plug
3
is turned clockwise from the position of
FIG. 8
, it must not be turned for more than 90°, otherwise the copper strips
35
and
36
each will get into contact with both of the L-shaped conductive portions
331
,
341
of the conductors
33
and
34
to cause a shortcircuit. Therefore, the air purifier is not ideal from the view point of safety.
SUMMARY OF THE INVENTION
Therefore, it is a main object of the present invention to provide an air purifier, of which the power plug can be rotated to any position without the risk of causing a shortcircuit.
The air purifier has a motor, a fan, a main body, a rear housing, and a filtering net like the one in the Background, and is provided with a power plug of the present invention.
The power plug includes a rotatable member and a pair of conductive members. The conductive members have ring-shaped portions concentrically arranged in a chamber of the housing, and have straight portions projecting into the housing form the ring-shaped portions so as to be electrically connected to the motor. The rotatable member is rotatably received in the chamber, and has a pair of copper strips, which stick out at outer ends for connection with a power socket, and which constantly touch a respective one of the ring-shaped portions from inner ends in the rotation of the rotatable member.
Thus, the air purifier can be turned to any orientation relative to the copper strips without the risk of causing a shortcircuit.


REFERENCES:
patent: 6214074 (2001-04-01), Beier et al.
patent: 6296522 (2001-10-01), Ho
patent: 6340926 (2002-01-01), Chu
patent: 6419378 (2002-07-01), Wedell et al.
patent: 6428351 (2002-08-01), Turner et al.
patent: 6461396 (2002-10-01), Baker et al.
patent: 6494940 (2002-12-01), Hak

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