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Set up rope emergency stop switch in three minutes

A Rockwell Automation - Allen-Bradley Guardmaster product story
Edited by the Engineeringtalk editorial team Sep 11, 2000

The problem of fitting and tensioning ropes on rope actuated emergency stop switches has been solved by Guardmaster with its universal Lifeline Rope Tensioner System (LRTS).

The problem of fitting and tensioning ropes on rope actuated emergency stop switches has been solved by Guardmaster with its universal Lifeline Rope Tensioner System (LRTS).

The system requires no special skills, nor tools, yet enables a rope system to be set up and operational in as little as 3 minutes.

Rope actuated emergency stop switches such as Guardmaster's Lifeline 2 and Lifeline 4 are among the most simple and effective emergency stop switches for use on equipment from conveyors to theme parks rides.

One of the major attractions of using them is the huge distances that can be covered, up to 75 metres with the Lifeline 4, for example.

However, over such distances rope tensioning at regular intervals to maintain effectiveness becomes inevitable.

Guardmaster took this requirement into account when designing the Lifeline 4 and the result is an integrated rope tension indicator which greatly assists the tensioning operation.

Now, with the LRTS Guardmaster has gone a step further and addressed the physical problem of tensioning ropes on all types of rope actuated emergency stop switches.

The LRTS requires no special skills to fit and no tools, other than an 8mm Allen key.

This is simply inserted into the setting bolt to achieve the desired tension, quickly and without fuss, significantly reducing fitting and tensioning time.

The LRTS tensioner is a universal device which, via a set of adapters and grippers, can be fitted to most makes of rope switches It offers users the flexibility to be situated in a range of locations along the rope length and has the capability to wind up to 150 mm of rope via a high strength internal winding mechanism.

The system of adapters and grippers, which is the key to the tensioner's universal operation, is both tough and tidy: the grippers are designed to withstand three times the required force to tension the rope switch and they have a cable tidy to prevent snagging on cable ends.

Because rope operated emergency stop switches are used over considerable distances the possibilities for vibration affecting the rope and causing nuisance tripping are considerable.

The LRTS has been subjected to extensive vibration testing against such a possibility.

When the LRTS is used with Guardmaster's Lifeline 4 emergency stop switch the user gets added protection against the problem of nuisance tripping The Lifeline 4 has a unique cam-action mechanism that ensures switching is positive and immediate in response to a definite deflection.

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