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Restraints are sometimes referred to as "holdouts." They are similar to pullbacks and are appropriate safeguards for both full and
part revolution
mechanical power presses. When properly anchored, restraints are
adjusted so that the operator can never reach the point of operation.
The size and type of restraint
depends on the size and type of press.
Restraints are applied on press brakes that perform long-run jobs. The
parts being produced are held by the operator, except in the case of
small parts in which a hand feeding tool must be used.
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Restraints with two operators
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Types of Restraints
For a printable sample restraint inspection checklist, please see Appendix
F.
| Restraint Regulations |
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A holdout or a restraint device
must protect the operator as
specified by: [1910.217(c)(3)(i)(c)]
and must include attachments
for each of the operator's hands.
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Attachments must be
securely anchored and adjusted and
separate set of restraints must be provided for each operator
if more than one is required on a press. [1910.217(c)(3)(vi)]
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Press brake operator wearing arm-type restraints
Click on image to view
animation
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| Arm-Type
Restraint Device |
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The arm-type restraint device is suitable for small to
medium-size presses, and short-bed press brakes when the
operator is able to load and unload, or hold parts without
reaching into, along side of, or near the point of operation.
They are commonly used for hand feeding of strip material or in
conjunction with hand feeding tools.
The device consists of a mounting bracket, tubular arms, and
adjustable nylon straps (with wristlets attached) for each hand.
Each tubular arm is applied perpendicular to the front of the
bolster and can be swung up to 90° to the side,
depending on the job situation. When not in use, the tubular
arms can be swung downward, out of the way.
The arms (1" square steel tubing) are 24" long
with 42" nylon straps provided. This allows ample freedom
of hand movement when operating from a sitting or standing
position.
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Arm-type restraint devices |
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| Overhead Restraint Device |
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The overhead restraint device is suitable for large
presses and short-bed press
brakes. It is a logical choice
when the operator never has to reach into, along side of, or
near the point of operation to perform their job.
Through the use of an overhead frame, boom rails, and braces, a
support bar is situated above and behind the operator.
Adjustable nylon straps, with wristlets, are attached to the
support bar. This provides the operator with holdout protection
for each hand, but allows ample freedom away from the machine to
handle large or clumsy parts without having to remove the
wristlets.
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Overhead restraints with two operators |
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| Sliding Restraint Device |
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The sliding restraint device is suitable for work on
wide presses or large-bed press brakes when the operator needs
to move laterally across the front of the machine or when the
job calls for two or more operators on the same machine.
A rail
is attached above and behind the operator(s), through the use of
two single restraint frames. A carrier that can travel along
the rail is provided for each operator. A pair of holdout
straps is attached to each of these carriers.
With this arrangement, each operator will be restricted to a
certain reach toward the machine, but will have lateral movement
available through the sliding carriers.
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Sliding restraint device |
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