Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical...
Reexamination Certificate
2000-01-18
2001-05-15
Picard, Leo P. (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
C361S601000, C361S622000, C361S623000, C174S050510, C174S050510, C312S223100
Reexamination Certificate
active
06233136
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to water fountain and more particularly to a structure of water and dust-proof control box for use in food machinery.
Conventional automatic conveyer devices have control boxes and so do food processing machinery since they are becoming more automatic. Control devices such as buttons, switches or turning knobs of the control boxes sometimes malfunction because of improper electrical contact, the problem is especially serious in the control boxes of food processing machinery because flour, water or dust can easily get in. As shown in
FIGS. 1 and 2
, a conventional control box mainly comprises a main box
10
and a back cover
20
. The main box
10
is formed in one piece with a panel
11
at the front which is connected to four side boards
12
. Holes
111
and
112
with mounting space around them are disposed on the panel
11
. The mounting space of holes
111
and
112
are corresponding to a turning knob
113
and a switch
114
respectively for connecting together. The turning knob
113
and the switch
114
are connected by wires to an IC board
21
of the back cover
20
. The back of the turning knob
113
is connected to a control knob
22
of the back cover
20
. An elastic positioning piece
23
is disposed on the back cover
20
for mounting into a mounting hole
13
on the main box
10
. The conventional control box has the following drawbacks:
1. The main box
10
is not directly connected to the IC board
21
which is connected to the back cover
20
instead, this make it more difficult to assemble.
2. Water, flour or dust can easily get into the control devices such as the turning knob
113
and the switch
114
through the holes
111
and
112
, thus causing improper electric contact, short-circuit or malfunction. This problem is especially seriously and commonly found in food processing machinery.
3. Because the switch
114
and the turning knob
113
are only resting on the panel
11
, this can easily depart from the main box
10
if being used very often. The connection between the control knob
22
and the turning knob
113
can also easily get loosed by turning and pressing manually.
SUMMARY OF THE PRESENT INVENTION
The present invention relates to a water and dust-proof control box structure. It mainly comprises a semi-box and a side cover. The semi-box having a panel board, a side board, a upper board and a lower board. The upper and the lower boards having few positioning holes. The panel board having few holes and mounting spaces for inserting a turning knob and a switch. The side cover having protruded bars for mounting into the positioning holes of the semi-box. The control box can accommodate few IC boards. The side cover having a back board, a upper board and a lower board. The panel board having few positioning blocks with screw holes for positioning with a positioning board. The positioning board having a control knob and a switch disposed on it. The control knob and the switch are capped by water-proof pads which are pressed against the innerwall of the panel board. A water-proof cover is disposed on the panel board. A water-proof frame pad is then placed on the inner wall of the panel board sticking out from the control box. This can prevent water and dust from getting in and the control knob and the switch from loosing and fall off.
The main purpose of the present invention of a water and dust-proof control box structure is to provide a means of preventing water and dust from getting in and also, it is also a easy-to-assemble device structure with low malfunction rate. Another purpose is prevent the control devices such as the control knob and the switch from loosing and fall off, which is firmly assembly into the control box.
The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings.
REFERENCES:
patent: 4063661 (1977-12-01), Doby
patent: 4800401 (1989-01-01), Sato et al.
patent: 4878154 (1989-10-01), Wang
patent: 5245507 (1993-09-01), Ericksen
patent: 5770817 (1998-06-01), Lo
patent: 5838533 (1998-11-01), Yazaryan et al.
patent: 401085513A (1989-03-01), None
patent: 405168555A (1993-07-01), None
Chervinsky Boris L.
Picard Leo P.
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