handle is moved to unlocked position
the force exerted by the spring is re-
laxed and the gripping cam may be
retracted by pushing the lifting shackle
into body of clamp. Refer to the Op-
eration Section of specific models of
“Lock Closed” clamps for additional
details. Typical “Lock Closed” clamps
are Models DG, FR and M.
“LOCK OPEN ONLY” - normally used
on “Hot Lift” clamps and consists of a
manually operated “Lock Stop Pin” that
is inserted when gripping cam of clamp
is retracted and removed when clamp
is positioned on the plate. Tag line
may be used to permit operator to re-
move pin from a greater distance from
clamp. Refer to the Operation Section
of specific model of “Lock Open Only”
clamps for additional details. Typical
“Lock Open Only” clamp is the Model
RO.
“LOCK CLOSED-LOCK OPEN” - an
over-center spring loaded mechanism
in which the spring exerts a force on
the gripping cam when the lock handle
is moved to the “Lock Closed” position.
When the handle is moved to the “Lock
Open” the gripping cam is maintained
in the retracted position for ease in in-
stalling the clamp on a plate or mem-
ber. The Model FRD contains individ-
ual “Lock Open” and “Lock Closed”
mechanisms that must be operated
separately. Refer to the Operation
Section of specific models of the “Lock
Open-Lock Closed” clamps for addi-
tional details. Typical “Lock Open-
Lock Closed” clamps are Models FRD,
R, S, SD, SEA, SX, TL, TLA and the J-
Series.
“LOCKING WEDGE” - is a fluted steel
wedge that is driven in place with a
hammer. The body of the wedge is
positioned in a slot in the clamp body
with the fluted edges contacting the
member to which the clamp is being
attached. Refer to Operation Section
of specific models of the “Locking
Wedge” clamps for additional details.
Typical “Locking Wedge” clamps are
Model A1, B1, B2 and PB.
”LOCKING SCREW” - “Lock Screw”
clamps depend on manually adjusting
a screw to hold the gripping surface in
place for lifting and removing the clamp
from member being lifted. Refer to
Operation Section of a specific model
of “Locking Screw” clamps for addi-
tional details. Typical “Locking Screw”
clamps are Models AC, ACP, NM, PC,
SCP and SCPA.
NON-LOCKING: “Non-Locking”
clamps have no mechanisms to aid in
attaching or removing clamp from
member being lifted. It is necessary to
have position of clamp maintained on
the member being lifted until a properly
applied force is exerted to the lifting
shackle. Refer to Operation Section of
specific models of the “Non-Locking”
clamps for additional details. Typical
“Non-Locking” clamps are Model AST,
ASTL, BD, HR, HDR and WHSR.
WARNING:
A pointing out and notice
of danger. The purpose of a
“WARNING” is to apprise the operator
and all other affected persons of the
existence of danger of which he should
be but may not be aware and to enable
the operator to protect himself and oth-
ers where applicable against such dan-
ger. An attempt is made herein to
warn against reasonable and reasona-
bly foreseeable danger in the proper
use and possible reasonable misuse of
RENFROE products described in this
manual.
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