Electromagnetic indicator device

Details Electromagnetic indicator device Electromagnetic indicator device

1986-11-17

1989-01-24

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

34081505, G09G 334

Patent

active

048003816

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to an electromagnetic indicator device which has a plurality of triangle-shaped vanes asymmetrical in relation to the axis of rotation, which are arranged on a plate in the form of a matrix, whereby a polarizing magnet is applied to the vane in the vicinity of the axis of rotation and the movement of the rotably supported vanes from a first position to a second position is effected by a permanently associated electromagnet fixed behind the plate.
Such an indicator device is state of the art. In the European patent application Ser. No. 00 84 959 an indicator device is described having vanes being asymmetrical in relation to the axis of rotation and which are contollable for the covering and the release of an opening by means of an electromagnet. The vanes are provided with a permanent magnet in the vincinity of the axis of rotation.
Furthermore a device for the visual representation of characters is known which consists of indicators arranged in rows and columns in form of a matrix (German Auslegeschrift Ser. No. 19 35 678). The areas of the plate surface covered by the vane on both sides of the axis of rotation are colored matching the visual color of the vane. The vane is also formed asymmetrically in relation to the axis of rotation but the form of the vane is semicircular.
Because of their composition the known indicator devices are very difficult and expensive in manufacture, moreover such indicator devices can only be manufactured in certain minimum sizes, whereby the display surface of the vane must be in the order of more than one square centimeter.


SUMMARY OF THE INVENTION

An indicator device has to be specified having a more simple composition and renders possible a more economical manufacture, whereby also very small sizes are manufacturable.
This is achieved by a plate, which is provided on the surface with a network of bearing brackets aligned with the outer edges of the plate, whereby four bearing brackets each form the corner points of a square and each bearing bracket is provided with the bearing for the pin of one vane respectively with both bearings for the pins of two neighbouring vanes and the triangular vanes have the axis of rotation in the hypotenuse.
Because of the arrangement of the bearing brackets which are provided with the bearing for one pin respectively with the bearings for the pins of two neighbouring vanes in connection with the triangular form of the vanes a very compact construction of the indicator device is possible. Because of the triangular form of the vane the weight distribution is exceptionally convenient with respect to the axis of rotation, thus causing a greater turn-over speed and a greater stability in both final positions.
From the German patent application Ser. No. 25 13 550 a device for the representation of characters is known, whereby some display devices forming a row or column of a display matrix are arranged on a strip which is provided with supports in the form of the four corner points of a square. The supports act as bearings for the disk shaped turn-over plates. These turn-over plates are symmetrical and turn around themself from one display position to the other.
A further development of the invention is that the tip of the vane is provided with a curvature and the bearing brackets have a clearing on both sides.
By this means is achieved, that nearly the total triangular area, i.e. the half of the square can be used as display area. Furthermore a very compact construction and with that a good optical image resolution is achieved.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the set-up of the indicator device in the top view in form of a mtrix,
FIG. 2 shows both positions of a vane,
FIG. 3 shows the a cut through the indicator device in the side view,
FIG. 4a and FIG. 4b show two cuts through a bearing bracket with two bearings,
FIG. 5 shows the top view of a bearing bracket with the bearings of two neighbouring vanes,
FIG. 6 shows the top view and the side view of a vane and
FIGS. 7a and 7

REFERENCES:
patent: 755272 (1904-03-01), Burnham
patent: 1357457 (1920-11-01), Jorgensen
patent: 3581301 (1971-05-01), Stutz
patent: 3916403 (1975-10-01), Mandszu et al.
patent: 4597209 (1986-07-01), Hukill

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