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ISC

Large Fishhook Red Rocker
Large Fishhook Red Red

Overview


Large Fishhook
(#1728)

Front View: Closed Rear View: Closed
Front View: Closed Rear View: Closed
 
End View: Open for Rigging Rear View: Open for Rigging
End View: Open for Rigging Rear View: Open for Rigging

Technical Details

I acquired my ISC Large Fishhook from Lisa Jones in 2011.

My Fishhook is 95 mm. long, 100 mm. wide, 52 mm. high, and weighs 305 g. The Fishhook closely resembles a Type 1 lever cam ascender. It has a milled and painted aluminum shell. The channel is 19.9 mm. wide with a rather flat U-shaped base. The inside of the shell has a milled depression that the cam forces the rope into, much like the one on the Rock Exotica Microcender. This spreads the load on the rope, and may increase the holding power of the Fishhook.

The cam is milled from aluminum alloy and painted. The cam face has six U-shaped lateral grooves forming seven teeth. A thin wire cable secures the cam to the shell, and also acts as a weak cam closing spring. The cam axle is a generic 9.9 mm. diameter pin with a spring-loaded ball and a hole drilled for a hitch pin. A 1.6 mm. stainless steel cable connects the axle pin, shell, and hitch pin.

One side of the Fishhook is stamped "ISC 11E."

Comments

The Fishhook is well made, but a bit bulky and heavy. As always, I dislike using painted devices on my ropes because the paint comes off, making a mess.


Red
(#1858)

Front Rear
Front Rear
 
Open for Rigging
Open for Rigging

Technical Details

I acquired my ISC Red from Patroller Supply in 2015.

My ISC Red is 97 mm. long, 104 mm. wide, 30 mm. high, and weighs 209 g. It consists of a movable lever and a fixed anvil sandwiched between two subtriangular plates made from 4 mm. anodized aluminum. A round 19 mm. eye is cut in the side of each plate. The front plate pivots on the lever mounting pin, and a notch in the left side of the front plate provides clearance for the anvil mounting pin.

The anvil and lever appear to be 13.5 mm. slices cut from an aluminum extrusion. The anvil is attached to the rear plate by two pins, one of which is extended to capture the notch in the front plate. The anvil itself is irregularly shaped with two humps. The lever is mounted on another rivet, but is free to rotate. A small spring forces the lever to the engaged position. A cutout on the rear side of the lever provides clearance for the spring. The distal end of the lever has a milled groove for the rope to ride in.

The side of the anvil opposite the rope has a small screw. A plastic "Popper™" (reminiscent of an old-style clothespin) engages this screy The other end has a 3 mm cord attached.

The front of the Red is printed with the Red logo, "I|S|C," "CE0120," a book-with-an-"i" icon, and two arrows labeled "UP." The rear is printed with "RP892," "EN12841:2006 A," "¤Ø10.5-11mm EN1891:A," "Max rated load 140kg," "14/50381/192", two human icons, "Rescue 240kg," and "Complies with ANSI Z359.1 2007." The inside is stamped with the "Sieg Heil" icon.

Comments

The Popper™ allows the user to two the Red downwards without the Red engaging. Unfortunately, it takes quite a bit of force to release the Popper™. I have my doubts but I haven't tested it. It is obvious, though, that the way mine was attached to the Red, it couldn't possibly work. I found an ISC brocure that shows a more reasonable rigging. Since I don't need a rope grab for caving, I'll let others do the testing. Some already have, with less than favorable results.

Warning:
Tests reported by the the US Bureau of Reclamation showed that the ISC Red does not always engage
It sometimes allows the user to drop the full length of the safety rope.

(Shaun Reed, Drop Testing of Rope Access Backup Devices, also see www.usbr.gov/rope/)


Rocker
(#2637)

Front Rear
Front Rear
 
Open for Rigging
Open for Rigging

Technical Details

I acquired my ISC Rocker in 2017 as part of Bob Thrun's collection.

My ISC Rocker is 70 mm. long, 115 mm. wide, 29 mm. high, and weighs 168 g.

The rocker consists of a movable lever and a fixed anvil sandwiched between two plates. The rear plate is a diamond-shaped stamping made from 3.9 mm. anodized aluminum. A round 15.0 mm. hole is cut in the right side of the plate, and a larger 23.8 by 24.2 mm. hole is cut in the left side. The front plate is pear-shaped and smaller, lacking the projection for the upper hole. The front plate pivots on the lever mounting pin, and a notch in the left side of the front plate provides clearance for the anvil mounting pin.

The anvil and lever appear to be 14 mm. slices cut from an aluminum extrusion and subsequently anodized. The anvil is attached to the rear plate by a round-head stainless-steel bolt that threads into a "nut" behind the rear plate. The "nut" is turned to form a rounded head; it has no flat surfaces for using a wrench. The bolt shaft is stepped, with an 8 mm. diameter for 4.6 mm. to engage the front plate notch, then 7 mm. where it passes through the anvil and rear plate to the "nut." A coiled pin through the rear shell keeps the anvil from turning. The anvil itself is shaped like a low, wide isoceles triangle, with a cutout opposite the lever end. The lever is mounted on a similar bolt, but is free to rotate. A small spring forces the lever to the engaged position. A cutout on the rear side of the lever provides clearance for the spring.

The front plate has "CE0120," "EN353-2," "EN358," a book-with-an-"i" icon, "Rocker," "I.S.C.u.k.," two concentric circles, and "Ø 10.5 - 12.7mm" and the Troll logo printed on the face. The inside of the rear plate has the "Sieg Heil" icon stamped between the hammer and anvil. The rear has "06-023233M" stamped in a dot matrix font..

Comments

The following rope grabs are all variations of the same basic design:

Image Rope Grab Manufactured Side Plates Locking Tab
ISC Rocker ISC Rocker 2006 (?) 3.9 mm. Anodized Aluminum Yes
Proverti AC08 Proverti AC080 4/2015 4.4 mm. Anodized Aluminum Yes
Proverti AC081 Proverti AC081 4/2015 2.5 mm Stainless Steel Yes
Singing Rock Locker Singing Rock Locker 1/2008 4 mm. Anodized Aluminum Yes
Troll Rocker Troll Rocker ~2001 4.3 mm. Anodized Aluminum

No
(newer models have the tab)

Xinda Rocker Xinda Rocker ~2014 4 mm. Anodized Aluminum Yes
Yates Rocker Yates Rocker ~2003 4.3 mm. Anodized Aluminum Yes

Each of these is a compact, lightweight (except for the stainless steel Proverti AC081) fall arrest that can also be used as a ratchet when hauling loads over a pulley. I'm not sure when the second carabiner hole is necessary - none of these came with instructions showing it in use.

These have no sharp teeth to cut the rope sheath. Some informal testing suggests that, lacking teeth, these can slide before engaging, but normally the slippage is less than a foot. The cases where I observed this were somewhat contrived (i.e., I held the grab in a specific position and carefully dropped the load straight down), and so I'm not too worried about the slippage. I would be far more concerned if they had sharp teeth and didn't slip at all.