Theatre Design & Technology - Fall 2014 - 69

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T o o L

safeguards
has to continue through construction, installation on stage, and
rehearsal of the show. Even if a production runs for only a short
period of time, protective barriers and accessories necessary to
prevent accidents cannot be overlooked or ignored. It only takes
a fraction of a second for an injury to occur.
The purpose of machine guarding is to prevent persons
from being injured by contact with a part of a machine that can
cause injury.
Injuries can be caused by contact with
* sharp edges or heated parts,
* crushing between surfaces, parts or edges,
* being struck by moving parts,
* machine or machine part failure.
OSHA safety standards have always required machine
safeguarding; however, in 2013 guarding was in the top ten most
frequently cited OSHA violations. Guards are typically provided
by tool manufacturers (fig. 1), but if safeguards or other safety
devices recommended by the manufacturer are not provided or
are not present on a tool or a machine, they should be obtained
and used.
Note about eye protection: OSHA requires employers to
ensure that employees use appropriate eye or face protection
when exposed to eye or face hazards from flying particles, liquid
chemicals, vapors, injurious light radiation, etc. Therefore, the
use of any tool or shop machine requires eye protection. Some
tools may also require the use of a face shield, which should only
be worn over primary eye protection.

3
Above, Motor-driven line sets safeguarded with an expanded metal cover. Below, a lockable
control station to prevent unauthorized use. Keys should only be used by trained workers.

GuardinG
Figure 2 shows an assembly that was used for a demonstration
at a recent USITT Conference & Stage Expo. If this device were
being used in a production and it was in a location where persons
could come in contact with it, their body parts, clothes, costumes,
or hand props could become entangled in the sprockets, chain,

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Theatre Design & Technology - Fall 2014

Table of Contents for the Digital Edition of Theatre Design & Technology - Fall 2014

Contents
Theatre Design & Technology - Fall 2014 - BB1
Theatre Design & Technology - Fall 2014 - BB2
Theatre Design & Technology - Fall 2014 - Cover1
Theatre Design & Technology - Fall 2014 - Cover2
Theatre Design & Technology - Fall 2014 - 1
Theatre Design & Technology - Fall 2014 - 2
Theatre Design & Technology - Fall 2014 - Contents
Theatre Design & Technology - Fall 2014 - 4
Theatre Design & Technology - Fall 2014 - 5
Theatre Design & Technology - Fall 2014 - 6
Theatre Design & Technology - Fall 2014 - 7
Theatre Design & Technology - Fall 2014 - 8
Theatre Design & Technology - Fall 2014 - 9
Theatre Design & Technology - Fall 2014 - 10
Theatre Design & Technology - Fall 2014 - 11
Theatre Design & Technology - Fall 2014 - 12
Theatre Design & Technology - Fall 2014 - 13
Theatre Design & Technology - Fall 2014 - 14
Theatre Design & Technology - Fall 2014 - 15
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Theatre Design & Technology - Fall 2014 - 18
Theatre Design & Technology - Fall 2014 - 19
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Theatre Design & Technology - Fall 2014 - 42
Theatre Design & Technology - Fall 2014 - 43
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Theatre Design & Technology - Fall 2014 - Cover3
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
https://www.nxtbookmedia.com