B6 Guides, buffers and stopping devices
B6.1. General requirements for guides
B6.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, if the car or the counterweight is
provided with such 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
B6.1 .2. The guides should be fixed to their brackets and to
the wall in such a manner as to permit compensation, either auto-
matically or by simple adjustment without any additional work,
of effects due to the normal settlement of the building or shrinking
of the concrete.
B6.2. Guiding of the car
B6.2. 1. The car should be guided by rigid metal guides.
B6.3. Guiding of the counterweight
B6.3.1. 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.
B6.3.2. When the counterweight is guided by ropes or steel
wire guides, they should be at least two in number; the arrangement
should be such that all contact between the counterweight and the
car or the wall of the well is prevented (see B7.2 and B7.3). Each
rope or wire guide should be kept taut.