Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1999-03-18
2000-11-14
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361687, 361690, 174 161, 454184, 16510433, H05K 720
Patent
active
061478652
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Field of the Invention
The present invention relates to an improvement of a casing structure for a numerical control unit.
2. Description of the Related Art
There is already known a casing structure for a numerical control unit comprising a casing body, a main cover and a sub-cover for closing a front opening of the casing body, and a fan cover attached to a top of the casing body.
Generally, in this kind of casing structure, a cooling fan is mounted on the fan cover, which is to be attached to the top of the casing body, to thereby form a unit, and installation of the cooling fan to the casing body is performed simultaneously with attachment of the fan cover to the casing body. However, it is necessary to connect wiring of the cooling fan to a power supply terminal on a control board attached to the main cover, with cables. Thus, if the casing is to be assembled by hand, a cumbersome work is needed in arranging the cables, and if the casing is to be assembled by an automated operation, an assembling error may happen due to interference of the cables.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a casing structure for a numerical control unit in which a cooling fan mounted on a fan cover is electrically connected with a control board attached to a main cover without using cables.
A casing structure for a numerical control unit of the present invention comprises: a casing body, a front cover for closing a front opening of the casing body, a fan cover attached to a top of the casing body, a control board attached to the front cover, a guide rail provided inside the casing for inserting and fixing the control board, locking members having release mechanisms provided at fitting portions of the covers and the casing body, a connection board provided on a rear side of the casing body and connected with a terminal on the control board, a cooling fan mounted on the fan cover, a terminal fixed to the fan cover and connected with wiring of the cooling fan, and a power supply terminal fixed to an upper end portion of the control board attached upright to the front cover, to be directly connected with the terminal fixed to the fan cover.
The casing structure for a numerical control unit of the present invention may further comprise: a lock mechanism provided between the fan cover and the control board attached to the front cover or between the fan cover and the front cover, to allow the front cover and the control board to be attached or detached only when the fan cover is detached. With this structure, the terminal fixed to the fan cover and the power supply terminal on the control board attached to the main cover is prevented from being damaged while the casing is assembled by hand or while the casing is disassembled and assembled for maintenance.
The front cover may be formed of synthetic resin, and a stay for attaching and detaching the control board may be formed integrally with the front cover. The stay has a support portion for supporting both sides of the control board and the support portion has a resilient tongue with a dowel at an end thereof to be fitted in a hole provided in the control board.
The front cover may comprise a main cover and a sub-cover. In this case, the power supply terminal to be connected with the terminal on the fan cover is fixed to the control board attached to the main cover, and the lock mechanism is provided between the fan cover and the control board attached to the main cover or between the fan cover and the main cover.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a left side view showing an embodiment of a casing for a numerical control unit according to the present invention in a see-through manner;
FIG. 2 is a front view showing a main part of the casing of FIG. 1 in a see-through manner;
FIG. 3 is a rear view showing a main part of the casing of FIG. 1 in a see-through manner;
FIG. 4 is a plan view showing a main part of the casing of FIG. 1 in a see-through manner;
FIGS. 5a to 5c show how a sub-cover and a sub-control board are a
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patent: 6042474 (2000-03-01), Harvey et al.
patent: 6064571 (2000-05-01), Noble
Hirano Kazuhiko
Muraoka Yutaka
Sasaki Kazuyuki
Datskovsky Michael
Fanuc Ltd.
Picard Leo P.
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