US 4,774,509 AGranted

Reset device for indicator

AssigneeASEA Aktiebolag

InventorsRolf Eriksson, Gudmar Hammarlund, Lars-Erik Sundqvist

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Abstract

A device for mechanically resetting, by means of a simple manipulation, an optional number of status indicators of the type consisting of an electromagnet with an iron core, a magnetizing winding and some form of permanently magnetized indicating disk capable of rotating through 180.degree.. The device comprises a rail made of a non-magnetic material and being formed so as to enable a desired number of indicators to be mounted side-by-side. The rail has such a profile as to enable a shuttle with a corresponding profile to be in engagement with and be guided by and slide on the rail in its longitudinal direction. The shuttle is provided with a permanent magnet as well as with a pole piece mounted so as to form, together with the core in the electromagnet of each indicator, a magnetic circuit when the shuttle is pushed over the respective indicator whereby the rotatable indicating disk is influenced and is reset to indicate the reset position.

Claims8

Dependent claims

An indicator mechanism which comprises:

an elongated rail which, when horizontally oriented, defines an upper surface, a lower surface, and a longitudinal axis line;
at least one status indicator device mounted within said elongated rail, said at least one status indicator device including:
(1) an electromagnet that includes a core having legs that extend toward the upper surface of said elongated rail, (2) a magnetizing winding wrapped around said core, and (3) an indicator disk which includes a permanent magnet and is rotatable by 180.degree.;
and
a shuttle element which is engaged with said elongated rail and is movable therealong over said upper surface of said elongated rail, said shuttle element including a permanent magnet which has pole pieces that extend towards the lower surface of said elongated rail so as to overlap a portion of the legs of the core of the electromagnet of said at least one status indicator device, movement of said shuttle element along said elongated rail causing the indicator disk of said status indicator device to be rotated into a reset position.

2 more elements

Dependencies are inferred from the claim text.