SPURS is designed to prevent nets, ropes or other pollution from wrapping around the shaft and damaging the joints.
The rotational effect given by a moving propeller irreparably drives the nets and ropes that it catches towards the stern tube, creates a tightening and sliding which damages all the joints and causes, at least, leaks or structural damage, immobilizing the ship.
Thrusters, Z-Drives and other propulsion components need the protection of Spurs®.
The most common repair on thrusters is seal damage and gear replacement, this is caused by excessive wear due to water intrusion. Guard against damaging thruster oil seals by installing Spurs® Cutter Systems.
Guard against damaging thruster oil seals by installing Spurs® Cutter Systems.
SHIP CUTTERS
Spurs Line Cutter Systems use the propeller’s rotation and inertial force to power the cutting action. As the offending line enters the propeller vortex, it is wound toward the propeller hub. (NOTE: It is at this point that, without SPURS installed, the line would wind itself tighter and tighter, entering into the space between propeller hub and rope guard, where it can damage the oil seals.) Instead, the line is engaged by the rotating cutter blades and delivered to the stationary cutter blade. The sudden resistance sensed by the stationary cutter forces a cam action which causes the blade to be pushed outward, meeting the rotating blade and severing the obstruction.
The cutting force increases in direct proportion to the resistance sensed by the stationary cutter assembly. This shearing action means that the cutting blades never actually come into contact with each other. Hydrophilic and bronze surface bearings maintain precise cutter positioning when a resistance occurs. With each rotation, the cutters pass each other gliding on a thin lubricating film of water or within a few thousandths of each other, thus avoiding surface wear during long passages. The stationary cutter centers itself in the cutter guides as it passes through with each revolution of the propeller.
SHAFT CUTTERS
Similar to the Propeller Mounted Systems, lines are wound down to the propeller hub and cut before the next revolution. However, the Shaft Mounted Systems is clamped on the shaft, riding on its inertial force with a blade hydroplaning on a Kevlar/Teflon bearing and is held stationary by a wedge holding block which is installed on the strut held by three screws.
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