|Front View: Closed||Rear View: Closed|
|Front View: Open for Rigging||Rear View: Open for Rigging|
I acquired my ISC RP229 from F. R. Jones and Son in 2017.
The ascender is left-handed, as are most chest ascenders I have seen. The ascender is 117 mm. high, 77 mm. wide, 40 mm. thick, and weighs 163 g. The ascender shell is subtriangular black anodized shape bent from 3.8 mm. aluminum sheet. The rope channel is formed by bending the right side of the ascender into a U. The rope channel is 15 mm. in diameter. The main sling attachment point is located below the cam and behind the rope channel. A second attachment point is located above the cam, also behind the rope channel. The shell is bent backwards at both points to provide clearance between the attachment slings and the main rope. This accounts for the rather large thickness of this ascender. The attachment points appear to be ovals distorted by the stamping operation. The lower attachment point measures 21.4 by 18.7 mm. and the upper 17.0 by 14.3 mm. The left side of the shell is bent on an inclined axis to form another U. A hole drilled through both sides of the U accepts a semi-tubular rivet. The cam and cam spring are mounted on this rivet. The pivot is centered 45 mm. from the inside of the rope groove.
The cam is a stainless steel casting. The cam radius increases from 37 to 56 mm. over an angle of 44°, giving a 28° cam angle. The cam has number of small conical teeth, all of which have their axes approximately aligned with the cam axle. The tooth pattern is (3)^3(2)(1S1)^4(3)^2. A spring-loaded manual safety bar is mounted on the bottom of the cam with a steel semi-tubular rivet. The normal action of the spring holds the safety against the cam. When the cam is opened, the shell interferes with the safety bar, thus preventing opening the cam. If the safety bar is moved away from the cam (opposing the spring), it will clear the shell and the cam will open. At full open the safety can be released and the spring will hold the safety against the back of the shell. This provides a means of locking the cam open.
The front of the ISC is screened with an up-pointing arrow. The rear is screened with "I|S|C," "CE0120," "EN567:97," "ROPE: Ø9mm - 13mm," "RP229," and "16/81188/31."
The ISC RP229 is well-made. The shell appears to have been blasted prior to anodizing, and the resulting finish, wwhile appealing, gives the action a slight (very slight) gritty feel. The cam is very well made and the safety is easy to use and effective.