Front View	Rear View

Technical Details

I acquired my Yurginsky Machine-Building Plant (Юргинский Машиностроительный завод) from Artyom Babin (Артём Бабин) in 2022.

This ascender is 208 mm. tall, 100 mm. wide, 32 mm. thick, and weighs 239 g.

The shell is a tall irregular shaped stamping formed from 3.6 mm. aluminum alloy sheet metal. A 16 mm. wide rope channel is formed in the upper portion of one side and a smaller cam channel lies opposite the first. A hole drilled through both sides of the cam channel accepts a 6 mm. semitubular rivet. The cam and cam spring are mounted on this rivet. The cam axle is centered 59 mm. from the inside of the rope channel. The handle below the cam has a slotted wooden hand grip riveted into place. A 16.5 mm. sling attachment hole is punched below the handle opening. A similar hole above the cam provides an upper attachment point.

The cam is milled from steel. The cam radius increases from 47 to 61 mm. over an angle of 38°, giving a 21° cam angle. The cam has number of milled teeth. The tooth pattern is (4)^12.

The cam safety is a machined aluminum lever mounted, along with a safety spring and a spacer, on a 2.8 mm. rivet in the same shell channel as the cam. Normally the spring holds the safety where it blocks the cam from opening. When the end of the safety lever is depressed, the opposite end pivots upwards so that the cam is no longer obstructed.

There are no markings on this ascender.

Comments

The hand opening is tall and the finger grooves on the handle fit my large hands nicely, but the opening's horizontal dimensions are rather small. the opening opposite the rest between the ring and index finger grooves is only 26 mm. wide.

I don't know what alloy was used for the cam, but the cam is well-rusted so it is not stainless. The teeth are nicely milled. The outer edges of the lateral teeth are moderately sharp, but the central teeth have flat tops. Do not expect this ascender to hold well on icy or muddy rope.