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Vertical (Вертикаль) Rocker
(ver 0115)

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

Technical Details

Artyom Babin (Артём Бабин) helped me acquire my Vertical (Вертикаль) Rocker (model ver 0115) from Vertical (Вертикаль) in 2022.

This Rocker is 65 mm. long, 109 mm. wide, 31 mm. high, and weighs 168 g.

This rocker consists of a movable lever and a fixed anvil sandwiched between two plates. The rear plate is a diamond-shaped stamping made from 4 mm. anodized aluminum. A round 15.0 mm. hole is cut in the top of the plate, and a larger 23.5 mm. wide by 23.6 mm. tall hole is cut in the bottom. 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 13.8 mm. slices cut from an aluminum extrusion. The anvil is attached to the rear plate by a stainless-steel rivet and an alignment pin that prevents rotation. The anvil itself is shaped like a low, wide isoceles triangle. The lever is mounted on a similar 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.

A 2.9 mm. thick lever lock pivots on a rivet near the upper hole. This tab allows one to restrict the motion of the lever to keep the Rocker from sliding on the rope.

The front plate is printed with the Vertical logo, "VERTICAL", "⇦," "ВВЕРХ" (UP), "EAC," "ГОСТ EN 12841-2014/A," " Ø11-12 мм 100кг," "ГОСТ EN 12841-2014/B," " Ø11-12 мм 150кг," a book-with-an-"i" icon, and "21.12" (the date of manufacture).


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

Image Rope Grab Manufactured Side Plates Lever Locking Tab
ISC Rocker ISC Rocker 2006 (?) 3.9 mm. Anodized Aluminum Yes
NTR Rocker NTR Rocker 2017 (?) 3.9 mm. Anodized Aluminum Yes
with forward fold
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 4.0 mm. Anodized Aluminum Yes
Troll Rocker, Version A Troll Rocker, Version A ~2001 4.3 mm. Anodized Aluminum No
Troll Rocker, Version B Troll Rocker, Version B ~2003 3.9 mm. Anodized Aluminum Yes
Vento (Венто) Rocker Vento (Венто) Rocker ~2019 3.9 mm. Anodized Aluminum Yes
Xinda Rocker Xinda Rocker ~2014 4.0 mm. Anodized Aluminum Yes
Xinda Rocker Vertical (Вертикаль) Rocker
ver 0115
12/2021 4.0 mm. Anodized Aluminum Yes
with forward fold
Yates Rocker Yates Rocker ~2003 4.3 mm. Anodized Aluminum Yes
Z&W Rocker Z&W Rocker ~2019 4.0 mm. Anodized Aluminum Yes
with forward fold

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. They can all be used as rocker-arm ascenders, but that was not the original design intent for the Troll Rocker, the progenitor of the others in the chart.

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.

The top hole is used for releasing or offloading a locked rocker by placing a carabiner in the hole and pulling toward the slack rope.

Except for the early Troll, each of these incorporates a lever lock. Troll added one to theirs before the others came out. The lever lock works, but one needs to be careful not to bump it so that it accidentally disengages. A carabiner in the upper hole can help prevent this. When the lever lock is disengaged, it blocks access to the upper hole.

The NTR, Vertical, and Z&W have a forward 90° bend at the top of their lever lock, making their locks much easier to operate than the others that rely on shallow rounded serrations.

Troll warns that using a rocker as a on soft or loose-sheathed ropes can cause the rope sheath to slip or tear. They also warn that rope conditions (water, ice, mud, dirt, etc) as well as rope diameter, manufacturer, etc. will affect device performance. These warning apply to all of these fall arrests.