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Adam Davies
ISC Product Specialist descends the 127m (418ft) National Lift Tower using the D4
tm
Work/Rescue Descender and RED
tm
Back-up Device
Location: Northampton (UK).
D4
tm
Work/Rescue Descender
The D4
tm
is a double-stop device with an auto-lock function which is
activated whenever the operator lets go of the handle and a panic
brake which is not overly sensitive in normal use.
Technical Information
RP880
Rated Load Rope Ø
655g (23oz)
240kg (551lb) 10.5-11.5mm (3/8-7/16”)
Weight
15
The D4
tm
is suitable for rescue with 10.5-11.5mm
(7/16”) Low Stretch ropes. (EN1891).
The D4
tm
& D5
tm
both feature a rated load of 240kg (550lbs), making it a true
Work/Rescue Descender.
The D4
tm
cam is made from a super hard solid Stainless Steel and is
highly wear and corrosion resistant. The D4
tm
is a featured product
compliant with CE Standards, NFPA T and ANSI Z359.4 for the
worldwide Rope Access and Rescue markets which typically use
10.5mm/11mm ropes.
The D4
tm
Descender features a unique and innovative progressive
cam action, which offers control at slow or fast speeds. The
progressive cam works by way of one cam operating inside another
cam.
It is also easy to back-feed the rope through the D4
tm
and therefore
it can be used for smooth ascending or for emergency hauling
(when used as part of a 2:1 ‘Z-rig’).
Push Button & location hole
Features & Applications
RP880 D4
tm
Work/Rescue Descender