CPC B66B 25/006 (2013.01) [B66B 25/003 (2013.01)] | 21 Claims |
1. A speed monitoring device for measuring a rotational frequency or rotational speed of a main drive shaft of a passenger transportation system, the speed monitoring device comprising:
at least one rotational speed sensor having an input shaft;
a tapping device configured such that it can be arranged on a shaft casing surface of the main drive shaft of the passenger transportation system, the rotational frequency of which is to be measured; and
a bracket for fixedly attaching the rotational speed sensor relative to an axis of rotation of the tapping device,
the speed monitoring device further comprising a pinion which is mechanically connected to the input shaft so that a rotation of the pinion is transmitted to the input shaft;
the tapping device having a gearing which can be coupled to the pinion in a rotation-transmitting manner; and
the pinion being rotatably mounted in the bracket at two bearing areas;
wherein the tapping device is configured to be attached to a side flank of a shaft shoulder of the main drive shaft; and
wherein a torsionally rigid, flexible clutch is provided between the pinion and the input shaft.
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