Version A	Version B

Overview

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Version A
(#1738)

Front View	Rear View

Technical Details

I acquired my Unknown #3, Version A from Brent Fader in 2011.

Version A is 67 mm. long, 122 mm. wide, 25 mm. high, and weighs 458 g.

Version A is made from a number of plated steel stampings and minor parts. One 2.5 mm. plate forms a 3/4-circle rope channel, and extensions tabs on the sides are bent to support the cam axle pins. There are two cams, and two dimples in the shell, one opposite each cam. Each cam is made from two steel stampings riveted together. One 3 mm. stamping is folded to form the two sides of the cam, and a 6 mm. stamping forms the center. Each cam has 9 V-shaped notches, forming 10 teeth on each cam. The cams are connected by a 2.4 mm. stamped channel with a stamped knurl pattern for better grip. The connections and cam axles are all rivets. Springs on the channel pivot pins act to close the cams. A 5 mm. stamped eye with a 20.8 mm. hole pivots from the pin connecting the channel and lower cam. This is the tie-in point.

One side of the shell is stamped with an up-pointing triangle, "Oben" ("above") underneath, and "Gebrauchsanweisung beachten" (roughly translated, "Note directions").

Comments

The dual cam is similar to that on some of the Miller 8174 rope grabs, but like the Mittleman KB2 and Super Anchor Safety 4015M (which it closely resembles), and unlike the Miller 8174s, this one cannot be opened to allow rigging at the middle of the rope. To rig this one, the user has to thread one end of the rope through the device.

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Version B
(#1737)

Front View	Rear View

Technical Details

I acquired my Unknown #3, Version B from Brent Fader in 2011.

Version B is 67 mm. long, 156 mm. wide, 35 mm. high, and weighs 550 g.

Version B has a stamped 4.4 mm. attachment hook that replaces the eye on Version A. Two stamped spring-loaded safeties pivot on a 4 mm. pin that passes through a stamped support riveted to the hook body.

There are no markings on Version B.

Comments

I acquired Versions A and B at the same time from the same source, and they have enough similarities for me to assume they are from the same manufacturer.

I prefer the eye on Version A to the hook on Version B, but this really is a function of how I would use it rather than an indictment.

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