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Front View Rear View Side View
Front View Rear View Side View
Front View: Open for Rigging Rear View: Open for Rigging
Front View: Open for Rigging Rear View: Open for Rigging

Technical Details

I acquired my RB from Olivier Peron Caillet in 2015.

The RB is 199 mm. tall, 45 mm. wide, 43 mm. thick, and weighs 313 g.

There is a fixed and a pivoting side plate made of 32 by 3.0 mm. aluminum. The upper end of the fixed side plate is bent inwards in a quarter circle, while the upper end of the pivoting side plate is bent into an 11.7 mm. I.D. inverted U-shaped channel. The end of the side plate is cut so that when closed, approximately 2/3 of the width of the side plate is nearly in contact with the upper bobbin, the gap being about 0.6 mm. The remainder is cut away to allow clearance for opening the bobbin. When the bobbin is in use the side plates keep the rope on the top bollard, and the end of the top side plate keeps the rope from jumping between the two grooves in the top bollard. The lower ends of the side plates are bent to converge at the attachment point, which consists of a 13 mm. hole in each side plate These holes are rounded on both sides. The bollards are turned aluminum with a milled slot to keep them from rotating on the fixed side plate. The lower bollard has a single wide rope groove, while the upper bollard has independent grooves for the two ropes. The top and bottom bollards are bolted to the fixed side plate with 7 mm. and 9 mm. bolts, respectively. The pivoting side plate pivots on the lower bolt and has a slot to allow clearing the upper bolt. The lower U-groove bollard is mounted through a hole in its center, but the upper V-groove bollard uses an off-centered arrangement to allow a smaller clearance slot in the upper side plate.

Each side plate is stamped it "R B" (possibly a former owner’s initials" and a symmetrical, 120° "Y." When the frame is closed, the center of the "Y" aligns with the center of the spare hole in the upper bollard.


I beleive that Olivier made this descender. Unfortunately, my computer lost most my emails from Olivier, and although I was able to recover a number of them, they have no dates and the key message describing this descender is lost.