Tractel "Blocstop BS" Manually Operated Wire Line Fall Arrest Block. From 800kg to 3200kg
For manriding applications a secondary braking device is mandatory, called BLOCSTOP.
Particularly well suited as a safety device on suspended cradles and platforms. It may also be used to hold or restrain any other loads during lifting and pulling applications.
The BLOCSTOP may be used:
- Mounted on a separate safety wire rope if required by safety regulations for suspended scaffolding and platforms in particular countries (e.g. Denmark, France, Sweden, Switzerland). The BLOCSTOP holds the load safely should there be any defect in the suspension wire rope or malfunction of the lifting machine.
- Mounted on the suspension or tensioned wire rope, the BLOCSTOP protects the load against malfunction of the lifting/tensioning device.
The BLOCSTOP Principle
A set of jaws, used successfully in all TIRFOR machines over many years, serves as the gripping device. The system is the self-locking type, i.e. if the wire rope is pulled against the direction of pull, the jaws automatically clamp onto the wire rope. The greater the pull, the more the jaws grip the wire rope.
The self gripping jaw system of the BLOCSTOP is designed not to damage the wire rope, even when used in EMERGENCY situations.
|BLOCSTOP on lifting wire rope.||BLOCSTOP on safety wire rope.||Releasing the BLOCSTOP whilst lowering the platform.|
BLOCSTOP BS models
While lifting a load or tensioning a wire rope the rope passes through the BLOCSTOP, there is no need to operate the it.
For lowering the load or releasing the wire rope the deivce is opened by lifting the operating lever upwards.
In case of a malfunction of the hoist or a defect in the suspension wire rope, releasing the operating lever, or pulling the lever downwards, caused by panic reaction, ensures that the load is instantly and safely held.
Once it has taken the load (e.g. when the operating lever is released) it cannot be opened again, so strong is its grip on the wire rope
. First lift the load a little to take the load off the BLOCSTOP, then you can release it again to continue lowering.
Mounting the BLOCSTOP
Is very easy. If the lifting machine is operating with TIRFOR or TIRAK wire rope, then it is mounted on the wire rope above the hoist.
If using other wire rope, or if safety regulations require a secondary safety wire rope, fit the secondary wire rope.
In both cases it is connected either to the load or to an anchor point with a sling or other suitable attachment. Ensure that the it is able to align itself in the pulling direction.
To avoid dynamic shocks the device should not be allowed to move more than 5 cm (when attached to a sling). Use a spacing device in order to keep the sling in tension when lifting.