Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1996-01-22
1998-02-10
Sparks, Donald
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361633, 362362, H05K 500
Patent
active
057175748
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/SE94/00292 filed Mar. 31, 1994.
BACKGROUND OF THE INVENTION
The subject invention concerns a signal indicating device which is mounted on the wall of a cover box or the like enclosing electric components such as contactors relays, and the like.
For the operation of various industrial processes and the control of the operational function of various types of means such as pumps, fans and the like, signal indicating means are required. In the case of contactors, relays, and switches it is necessary to indicate the positions of contact, which are displayed with the aid of signalling or indicator lamps on a control panel. These components are enclosed in the cover box and the signalling or indicator lamps are mounted on the box front which serves as a control-panel front.
In accordance with prior-art techniques a number of rows of holes are made in the panel front wall of the box and the signalling or indicator lamps, which may be, e.g. of LED type, are mounted in the holes. Wiring connects each lamp to its associated electric component inside the box.
To form a panel of signalling or indicator lamps in the wall of the cover box in the manner indicated is a comparatively complex operation. The drilling of rows of round holes or the sawing of square or rectangular apertures, the mounting of a lamp in each hole or aperture and the subsequent electric connection of each lamp with its associated component are time-consuming operations with consequential comparatively high panel-production costs. Installations in polluted or humid environments require separate enclosures with special seals and gaskets, which delays and makes the work still more difficult.
SUMMARY OF THE INVENTION
The subject invention provides a signal indicating device which may be mounted on a cover box in a highly simplified manner. The signal indicating device is a pre-assembled unit which may be attached to a cover box in connection with the mounting while at the same time an efficient sealing effect with respect to the box is achieved through simple means.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in closer detail in the following with reference to the accompanying drawings, wherein:
FIG. 1 is an exploded perspective view of the signal indicating device;
FIG. 2 is a horizontal sectional view through a wall of a cover box in which wall the signal indicating device is mounted;
FIG. 3 is a perspective view of a cover box having the signal indicating device mounted thereon; and
FIG. 4 is a perspective view of an alternative embodiment of the signal indicating device.
DETAILED DESCRIPTION
The device comprises a printed circuit card 1 on which rows of signalling lamps 2, preferably LEDs, are mounted as is also a pair of plugs 3, the latter being arranged on the side of the card 1 opposite to that on which the lamps 2 are mounted. The card 1 is placed inside a case 4 the front wall 5 of which is provided with a couple of rows of holes 6. In the mounting of the printed circuit card 1, the signalling or indicator lamps 2 are pushed through their associated one of the holes 6 so as to project beyond the external face of the wall 5. O-rings 7 applied about each lamp 2 seal against the inner face of the wall 5. A rear wall 7a of the case 4 hermetically encloses the card 1 inside the case 4. A central opening 8 formed in the rear wall 7a allows the plugs 3 and a couple of threaded sleeves 9, mounted on the printed circuit card 1, to project through and beyond the backing 7a. When the assembly is thus completed the opening 8 is sealed, e.g. by means of a solidifying type of sealing compound.
FIG. 2 illustrates the thus assembled signal indicating device when mounted on the front wall 11 of a cover box 10, the front wall in this case being formed by the box door. A printed circuit indicating or control card 12 is mounted on the inner face of the wall 11 and comprises various electrical means, such as timing circuits, galvanic separating components, etcetera w
REFERENCES:
patent: 4262181 (1981-04-01), Tufano et al.
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