Theatre Design & Technology - Summer 1986 - 46

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continued from page

·n ...

RECOMMENDED
GUIDELINES
-----I( * IL---'
*
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*

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4.8

In technical stage equipment with optional manual or
power drive, selection shall be mutually exclusive, so
that one is switched off while the other drive is in use.

4.9

Manually operated technical stage equipment shall
be designed in such a way that the force used by the
operator does not exceed fifty pounds (50 Ibs.).

4.10

In drive elements which transmit torque for vertical
load movements, press fits alone are not permitted.
Lowering of loads with power driven hoisting units
must occur with a switched on motor. Excepted are
protective curtains and hydraulically driven hoisting
units.

4.11

Brakes and Locking Devices
4.12

4.13

4.14

4.15

4.16

4.17

.j.j

Manually operated winches shall be equipped with
an effective locking device against return motion and
with a self-locking brake. This equipment is not necessary if self-locking gears are used.
The brakes of the manually operated winches shall be
designed as load-pressure brakes. If the winches are
eqUipped with ratchet handles, the movement of the
ratchet handles may not exceed sixty degrees (60°)
total travel, or plus/minus thirty degrees (± 30°) from
center.
Winches with hand cranks designed to hold suspended loads shall have a brake that is normally on.
The locking element used for this purpose must create a positive lock with the drum.
Power driven hoisting units for technical stage equipment shall be equipped with spring loaded electrically
or hydraulically released brake capable of stopping
the rated load within a reasonable distance.
Electrically driven wire rope elevators of technical
stage equipment intended for regular conveyance of
persons shall be equipped with two mutually independent brakes. One of the brakes is to be installed
in such a way that its effectiveness is not impaired by
drive damage. Each brake shall be individually test·
able. If a counterweight is present, and the maximum
live load is less than twenty percent (20%) of the lifting floor or car, only one brake is required. In selflocking hoist drives only that brake which remains
effective in case of drive damage is required.
Horizontal pulling devices not driven via worm gears
shall have one brake.

Theatre Ill-sign c'\.

Tel"hn()l()g~

USITT SUIlllllcr \986

Horizontal pulling devices driven via worm gear~
with a 40:1 or greater ratio do not require a brake.

*

*
*
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*
*

Wire Rope Drum
4.18

Motor driven drums shall be manufactured so that thE
wire rope is wound in single layer only. All meta
drums shall have machined grooves as specified ir
the current edition of the Machinery Handbook.
Excepted are those drums which allow the wirE
rope to stack only on its own width.

4.19

Motor driven winches shall be manufactured so as te
prevent the wire rope from leaving the ends of thE
drum.

*

*

Winches using grooved drums must include device~
which prevent the wire rope from jumping or leavin~
the assigned groove.

*

4.20

*

4.21

The drums shall be dimensioned in order that a mini
mum of three (3) windings or dead wraps of wire ropE
remain on the drum at all times.

4.22

The diameter of drums and pulleys shall be no les~
than thirty (30) times the diameter of the wire ropE
used.

*
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The fleet angle of the wire rope leaving the drum shal
be no more than plus or minus two (± 2°) degrees.

*

4.23

*

Wire Ropes
4.24

Braided wire ropes and plastic fiber wire ropes are no
permitted as load-bearing wire ropes.

*

4.25

Natural and synthetic fiber lines are permitted for USE
as the principal suspension components only ir
"hemp" flying systems or in horizontally moved de
vices. Natural and synthetic fiber lines are not per
mitted for use as load bearing lines in winch ane
counterweighted flying systems.

*

Dimensioning of Wire Ropes

*

4.26

*
*
*
*
*

4.27

The safe working loads of a wire rope shall be de
termined by dividing the manufacturer's stated break
ing strength by the applicable wire rope safety factor

For horizontally moved technical stage equipment thE
pulling lines shall be dimensioned with a minimurr
safety factor of six (6).

continued on page 46 ...



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1986

Contents
Theatre Design & Technology - Summer 1986 - 1
Theatre Design & Technology - Summer 1986 - 2
Theatre Design & Technology - Summer 1986 - 3
Theatre Design & Technology - Summer 1986 - Contents
Theatre Design & Technology - Summer 1986 - 5
Theatre Design & Technology - Summer 1986 - 6
Theatre Design & Technology - Summer 1986 - 7
Theatre Design & Technology - Summer 1986 - 8
Theatre Design & Technology - Summer 1986 - 9
Theatre Design & Technology - Summer 1986 - 10
Theatre Design & Technology - Summer 1986 - 11
Theatre Design & Technology - Summer 1986 - 12
Theatre Design & Technology - Summer 1986 - 13
Theatre Design & Technology - Summer 1986 - 14
Theatre Design & Technology - Summer 1986 - 15
Theatre Design & Technology - Summer 1986 - 16
Theatre Design & Technology - Summer 1986 - 17
Theatre Design & Technology - Summer 1986 - 18
Theatre Design & Technology - Summer 1986 - 19
Theatre Design & Technology - Summer 1986 - 20
Theatre Design & Technology - Summer 1986 - 21
Theatre Design & Technology - Summer 1986 - 22
Theatre Design & Technology - Summer 1986 - 23
Theatre Design & Technology - Summer 1986 - 24
Theatre Design & Technology - Summer 1986 - 25
Theatre Design & Technology - Summer 1986 - 26
Theatre Design & Technology - Summer 1986 - 27
Theatre Design & Technology - Summer 1986 - 28
Theatre Design & Technology - Summer 1986 - 29
Theatre Design & Technology - Summer 1986 - 30
Theatre Design & Technology - Summer 1986 - 31
Theatre Design & Technology - Summer 1986 - 32
Theatre Design & Technology - Summer 1986 - 33
Theatre Design & Technology - Summer 1986 - 34
Theatre Design & Technology - Summer 1986 - 35
Theatre Design & Technology - Summer 1986 - 36
Theatre Design & Technology - Summer 1986 - 37
Theatre Design & Technology - Summer 1986 - 38
Theatre Design & Technology - Summer 1986 - 39
Theatre Design & Technology - Summer 1986 - 40
Theatre Design & Technology - Summer 1986 - 41
Theatre Design & Technology - Summer 1986 - 42
Theatre Design & Technology - Summer 1986 - 43
Theatre Design & Technology - Summer 1986 - 44
Theatre Design & Technology - Summer 1986 - 45
Theatre Design & Technology - Summer 1986 - 46
Theatre Design & Technology - Summer 1986 - 47
Theatre Design & Technology - Summer 1986 - 48
Theatre Design & Technology - Summer 1986 - 49
Theatre Design & Technology - Summer 1986 - 50
Theatre Design & Technology - Summer 1986 - 51
Theatre Design & Technology - Summer 1986 - 52
Theatre Design & Technology - Summer 1986 - 53
Theatre Design & Technology - Summer 1986 - 54
Theatre Design & Technology - Summer 1986 - 55
Theatre Design & Technology - Summer 1986 - 56
Theatre Design & Technology - Summer 1986 - 57
Theatre Design & Technology - Summer 1986 - 58
Theatre Design & Technology - Summer 1986 - 59
Theatre Design & Technology - Summer 1986 - 60
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http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Oct
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966May
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
http://www.nxtbookMEDIA.com