Signs of the Times - December 2017 - 34
NUTS + BOLTS
Two equal-length slings used here at optimal angles to hoist a massive load.
Eye-bolts must incorporate shoulders
and be properly oriented relative
to slings.
lifting capacity up to 50%.
All slings are marked with tags
indicating their safe-load limits when
used in various configurations. These
safe-lifting capacities vary substantially depending on how a sling is
used during hoisting. A key factor is
the angle formed between the crane's
hook and the point of attachment
to the load. As a general rule, slings
have optimum load capacities when
used in configurations ranging from
vertical to a 45° angle from vertical.
This is particularly important when
loads are extremely heavy.
Using two identical slings of adequate length balances the load and
enables optimal sling angles. Conversely, hook-ups utilizing shorter
slings (e.g. where the crane hook is
relatively close to the top of the hoisted
sign) should be avoided whenever
possible because, in these configurations, the slings' load capacities are
reduced and greater stress is applied
to all of the rigging devices.
Because many signs are relatively
lightweight for their sizes, the hard34
SIGNS OF THE TIMES
DECEMBER 2017
Anchor shackles used to connect slings to the hoist hardware on loads.
ware provided by manufacturers
to serve as hoist points might be
ordinary, forged-steel eye-bolts. As in
the case of sling angles, the angle at
which a sling is attached to an eyebolt during hoisting should not be
less than 45° to avoid failure due to
shear forces.
Before any sign is lifted, installers
should always inspect the hoist hardware provided to verify its secure
fastening to the sign cabinet. Eye-bolts
used for hoisting must incorporate
shoulders allowing the bolts to be
fastened flush against the top of a
sign. Additionally, when eye-bolts
serve as hoist hardware, proper orientation of the bolts in relation to the
direction of lifting force is critical.
Anchor shackles are forged-steel
devices commonly used for attaching slings to eye-bolts or other types
of hoist hardware. These devices
typically incorporate threaded pins
which must be hand-tightened securely into the shackle body prior to use.
Never substitute ordinary bolts for
shackle pins; this adversely affects
the shackle's rated capacity. Also,
never use a shackle in a configuration
where tension might make the sling
bear on the pin in a way that would
unscrew it.
To determine the load capacity of
a shackle, its size is stamped into the
forged metal by the manufacturer.
Shackle sizes ranging from 3/8- to
¾-in. - the sizes most commonly
used by sign installers - have load
capacities ranging from 1 to 4.75 tons.
Whether you're using a synthetic
sling or another apparatus, avoiding
"time savers" and shortcuts is key -
and could save a life!
Table of Contents for the Digital Edition of Signs of the Times - December 2017
Signs of the Times - December 2017
Contents
From the Editor
St Update
At Large
Tech Review
Vehicles + Vinyl
Design Matters
Nuts + Bolts
An Overarching Theme
The Value of Signs
Going With the Flow
Design Software
New Products
Advertising Index
Last Look
Signs of the Times - December 2017 - Intro
Signs of the Times - December 2017 - BB1
Signs of the Times - December 2017 - BB2
Signs of the Times - December 2017 - Signs of the Times - December 2017
Signs of the Times - December 2017 - BD_L
Signs of the Times - December 2017 - BD
Signs of the Times - December 2017 - Cover2
Signs of the Times - December 2017 - 1
Signs of the Times - December 2017 - 2
Signs of the Times - December 2017 - 3
Signs of the Times - December 2017 - Contents
Signs of the Times - December 2017 - 5
Signs of the Times - December 2017 - 6
Signs of the Times - December 2017 - 7
Signs of the Times - December 2017 - 8
Signs of the Times - December 2017 - 9
Signs of the Times - December 2017 - From the Editor
Signs of the Times - December 2017 - 11
Signs of the Times - December 2017 - St Update
Signs of the Times - December 2017 - 13
Signs of the Times - December 2017 - 14
Signs of the Times - December 2017 - 15
Signs of the Times - December 2017 - 16
Signs of the Times - December 2017 - 17
Signs of the Times - December 2017 - 18
Signs of the Times - December 2017 - 19
Signs of the Times - December 2017 - At Large
Signs of the Times - December 2017 - 21
Signs of the Times - December 2017 - 22
Signs of the Times - December 2017 - 23
Signs of the Times - December 2017 - Tech Review
Signs of the Times - December 2017 - 25
Signs of the Times - December 2017 - Vehicles + Vinyl
Signs of the Times - December 2017 - 27
Signs of the Times - December 2017 - 28
Signs of the Times - December 2017 - 29
Signs of the Times - December 2017 - Design Matters
Signs of the Times - December 2017 - 31
Signs of the Times - December 2017 - Nuts + Bolts
Signs of the Times - December 2017 - 33
Signs of the Times - December 2017 - 34
Signs of the Times - December 2017 - 35
Signs of the Times - December 2017 - 36
Signs of the Times - December 2017 - 37
Signs of the Times - December 2017 - An Overarching Theme
Signs of the Times - December 2017 - 39
Signs of the Times - December 2017 - 40
Signs of the Times - December 2017 - 41
Signs of the Times - December 2017 - The Value of Signs
Signs of the Times - December 2017 - 43
Signs of the Times - December 2017 - 44
Signs of the Times - December 2017 - 45
Signs of the Times - December 2017 - Going With the Flow
Signs of the Times - December 2017 - 47
Signs of the Times - December 2017 - Design Software
Signs of the Times - December 2017 - 49
Signs of the Times - December 2017 - 50
Signs of the Times - December 2017 - 51
Signs of the Times - December 2017 - New Products
Signs of the Times - December 2017 - 53
Signs of the Times - December 2017 - 54
Signs of the Times - December 2017 - 55
Signs of the Times - December 2017 - 56
Signs of the Times - December 2017 - 57
Signs of the Times - December 2017 - 58
Signs of the Times - December 2017 - 59
Signs of the Times - December 2017 - 60
Signs of the Times - December 2017 - 61
Signs of the Times - December 2017 - 62
Signs of the Times - December 2017 - 63
Signs of the Times - December 2017 - 64
Signs of the Times - December 2017 - 65
Signs of the Times - December 2017 - 66
Signs of the Times - December 2017 - 67
Signs of the Times - December 2017 - 68
Signs of the Times - December 2017 - 69
Signs of the Times - December 2017 - 70
Signs of the Times - December 2017 - 71
Signs of the Times - December 2017 - 72
Signs of the Times - December 2017 - 73
Signs of the Times - December 2017 - 74
Signs of the Times - December 2017 - 75
Signs of the Times - December 2017 - 76
Signs of the Times - December 2017 - 77
Signs of the Times - December 2017 - 78
Signs of the Times - December 2017 - Advertising Index
Signs of the Times - December 2017 - Last Look
Signs of the Times - December 2017 - Cover3
Signs of the Times - December 2017 - Cover4
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