Spring return device
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United States of America Patent
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Apr 23, 2019
Grant Date -
Jan 5, 2017
app pub date -
Jun 29, 2016
filing date -
Jul 1, 2015
priority date (Note) -
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Abstract
A spring return device comprising a rotatable drive coupling configured for releasably engaging a rotatable drive part on a first side of the device and configured for releasably engaging a rotatable drive part on an opposite second side of the device; a spring engaged with the drive coupling; and a retainer that retains the spring; wherein: rotation of the drive coupling in a first direction relative to the retainer causes mechanical energy to be stored in the spring; and the spring return device comprises an integral locking mechanism that is actuatable between a first state in which rotation of the drive coupling relative to the retainer is allowed and a second state in which rotation of the drive coupling relative to the retainer is prevented.
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