Guides, buffers and stopping devices

Pages:46-49
 
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A6. Guides, buffers and stopping devices
A6.1. General requirements for guides
A6.l.1. The strength of guides, their brackets and joints
should be sufficient to withstand the stresses imposed by the
operation of the safety gear, as well as by deflection caused by
uneven distribution of the load in the car. Such deflection should
be limited to a level that will not affect the normal operation of
the lift.
A6.l.2. The guides should be fixed to their brackets and
to the wall in such a manner as to permit compensation, either
automatically or by simple adjustment without any additional
work, of effects due to normal settlement of the building or shrink-
ing of the concrete.
A6.2. Guiding of the car
A6.2. 1. The car should be guided by rigid metal guides.
A6.3. Guiding of the counterweight
A6.3.1. The counterweight should be guided either by rigid
metal guides or, if the distance between rigid attachments does not
exceed lOOft (30m), by means of ropes or steel wire guides.
A6.3.2. When the counterweight is guided by ropes or steel
wire guides, they should be at least four in number; the arrange-
ment should be such that all contact between the counterweight
and the car or the wall of the well is prevented (see A7.2 and A7.3).
Each rope or wire guide should be kept taut.
A6.4. Car and counterweight buffers
A6.4. 1. A lift should be provided with buffers at the bottom
limit of the travel of the car and of the counterweight.
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