Wood’s Powr-Grip PT410AC - Manual (Page 8)

Rev 11.3/2-13 6 PT410AC: #35140
INTENDED USE
L
OAD
C
HARACTERISTICS
WARNING: This lifter is NOT intended for lifting hazardous materials, such as
explosives or radioactive substances.
The operator must verify that the lifter is intended to handle each load, in accordance with the
following requirements:
• This lifter is designed to lift windshields, or similar loads, that vary in curvature.
2 Nevertheless,
some extreme curves may prevent the lifter from attaching to a load. Other curves may allow
the lifter to attach but require manual assistance from the operator, in order to establish a
seal between the vacuum pads and the load (see OPERATION: T
O
A
PPLY THE
P
ADS TO A
L
OAD
).
Because the lifter is designed to accommodate extreme variations in load shape, the lifter
places some stress on most windshields being lifted. The location and magnitude of the
stresses vary with each lift, according to the windshield curvature and the placement of the
lifter on the windshield.
• The load must not exceed the maximum allowable weight specified under Load Capacity (see
SPECIFICATIONS).
• The load must be a single piece of nonporous or semiporous material with a semicurved and
relatively smooth contact surface. To determine whether the load is too porous or rough,
perform the test under Vacuum Level on Other Surfaces (see OPERATION: T
O
A
PPLY THE
P
ADS
TO A
L
OAD
).
• The load's contact surface must be suitable for obtaining a friction coefficient of 1 with the
lifter's vacuum pads (see MAINTENANCE: V
ACUUM
P
AD
M
AINTENANCE
: Friction Coefficient), as
verified by a friction test. If necessary, contact Wood's Powr-Grip for help in conducting a
friction test.
• In order to avoid damaging the vacuum pads, the load's surface temperature must not exceed
the allowable Operating Temperatures (see SPECIFICATIONS). However, if such an
application cannot be avoided, Wood's Powr-Grip does offer a heat-resistant rubber
compound and other solutions which may enable you to lift loads with higher surface
temperatures. Contact Wood’s Powr-Grip or an authorized dealer for more information.
• While the minimum length and width of the load are determined by the Pad Spread (see
SPECIFICATIONS), the maximum length and width are determined by the allowable
overhang, or the amount of load material that can extend sideways beyond the vacuum pads
without breaking or otherwise being damaged.
The allowable overhang depends on the kind of load material being lifted, the thickness of the
material, and the angle at which it is handled (if any). Since materials such as glass, stone or
sheet metal each have different physical properties, the allowable overhang must be
2
The minimum continuous radius at the attachment area of the load must be either 45" [115 cm] around an axis parallel to the
lifter's tilt axis or 95" [242 cm] around an axis perpendicular to the tilt axis (but not both). However, compound curves and
complex shapes may permit loads with tighter radii to be lifted.