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The Tirfor machine is a multi-purpose wire rope machine, the originality of which is in the jaw mechanism. As opposed to traditional winches where the wire winds round a drum, the wire rope is pulled through the machine by the two pairs of self gripping jaws which grip the wire rope without deforming it.

For suspended cradles and platforms, the Tirfor machine gives: smooth operation - constant effort - unlimited height - complete safety.

For additional safety, it is recommended that a Blocstop secondary safety device is used in conjunction with Tirfor machines on suspended cradles and platforms, safeguarding any possible failure in the machine.

A range of automatic Blocstops is available when secondary safety ropes are required for maximum protection.

The Blocstop is a pair of Tirfor jaws, hence it can be pushed up the rope freely but will lock onto the rope on descent. A jaw opening lever is fitted to the Blocstop which s held open when descending. The recommended method of descent using a Blocstop is to lower the Tirfor normally leaving the Blocstop locked on the rope until the Blocstop Anchor sling is almost taut. The Blocstop is then released and pulled down until it is in contact with the top of the Tirfor machine. This operation is continued until the descent is completed.