2020 Ronstan Sailboat Hardware Catalogue - Page 82

Constrictor® Textile Rope Clutches
Release lanyard in
‘gripping’ position
Design optimisation
Release lanyard in
‘open’ position
Structural integration model
Release lanyard knob
Technora® aramid textile sleeve
Unlike conventional clutches, the Constrictor® does not crush the rope
between two metal surfaces. Instead, the loaded rope is held securely in
a textile sleeve, itself attached to a base unit. The rope runs freely through
the sleeve in one direction, but is gripped instantly when running out in the
opposite direction. This patented “constrictor effect”, provides greater holding
power as the load increases.
Stronger and lighter
Bi-conical titanium ring
The patented textile sleeve element is locked in place between a titanium ring and the base
unit. The unique conical geometry allows easy insertion of the rope, and ensures that the
sleeve is perfectly integrated with the alloy base unit in supporting the applied load.
Controlled holding power
Pulling on the Dyneema lanyard retracts the sleeve, relaxing the grip on the rope and
allowing it to run freely in either direction. The lanyard can be fixed in the V-notch of the base
unit to hold the Constrictor® in the open position. Releasing the lanyard allows the sleeve to
be drawn to its extended position by a shock cord, constricting the rope in a firm, secure grip.
• Braid Orientation: Cousin Trestec’s experience and expertise in rope manufacture guided
the development of the critical braiding angle to maximise grip and minimise slippage.
• Fibre Assembly: Extensive knowledge of fibres combined with laboratory and field testing
has resulted in an optimum fibre balance and density for unmatched strength.
• Treatment: A specialised surface treatment plays a critical role in extending the product
life, UV protection, boosting grip and reducing abrasion in stress areas.
Twice the holding power and a third of the weight of conventional rope clutches.
Release under load
The line can easily be released under load without the use of a winch simply by pulling the lanyard.
Non destructive
The textile sleeve closes like a constrictor on the line. The extraordinary grip is the result of fibreto-fibre contact that is far less aggressive and much more effective than a traditional metal cam.
Structural integration
The Constrictor® is also available in a version suitable for structurally integrated installations.
Instead of the notched alloy base unit, the sleeve is supplied with an alloy mounting collar
that can be built into a suitably reinforced bulkhead or a customised base fitting.
Remote release
The Dyneema® lanyard can be extended for remote release; for example, to lock a halyard or
reefing line to reduce spar compression and minimise rope creep.


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