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Handled Eccentric Cam Ascenders
Double-Rope

This section includes mechanical ascenders consisting of a shell or frame and an eccentric cam assembly attached to the shell/frame at a single pivot point. The shell/frame is open on one side to allow admittance of the standing rope. The shell/frame below the cam is enlarged to provide a handle. No sling attachment points are provided on the cam.

These ascenders are generally larger and heavier than the handleless eccentric cam ascenders; conversely, they are easier to manipulate, particularly with gloved hands. I don't normally wear gloves ahile ascending (except in cold conditions), but many people prefer to do so.

I split the Handled Eccentric Cam Ascenders into these four groups:

Cavers and climbers rarely need to climb a doubled rope and so they would not likely choose one of these as their main ascender, but arborists and other working professionals have found uses for devices like these.

In the ID column and chart, I used a red background for cast-frame ascenders, green for milled-frame ascenders, and blue for stamped-frame ascenders. Magenta indicates a two-rope ascender.

Gallery

Image ID Device Description Acquired Weight Height Width Thickness Std. volume Channel Diameter Cam Angle Tooth Pattern
Clark Single-handled Dual Ascender 1531 Clark Single-handled Dual Ascender Made from 2 Petzl Ascensions joined, rope retainer, safety block pin, noncommercial, ,  Jim Clark, 2009 457 176 89 41 649 15.4 30° (3.1.4)(1S1.1S0.2S2)^2(1S1)(2.3)
Climbing Technology Quick'Arbor 1976 Climbing Technology Quick'Arbor Double-rope, stamped frame, rubber grips, 2 pear top & 5 round bottom holes, plastic rope retainers, stamped cam stops, hybrid cam /w sloping teeth, double-pin safety with pivot on side of cam Jim Goodall Equipment, 2014 498 222 161 57 2019 15.7 31° (3.4.2)(1H1.2)^3(3.2)
CMI Expedition Twin, Version A 1934
1940
CMI Expedition Twin, Version A Double-rope, stamped frame, plastic grips, round top & 2 round bottom holes, pin cam stops, hybrid cam /w straight teeth, split ring & cable cam trigger, plastic safety levers in cam channel, QR pin safety
  • Troy Kossick, 2012
  • Alex Zimmerman, 2013
429 208 106 62 1358 16.5 25° (4.3)^5(4)
CMI Expedition Twin, Version B 2279 CMI Expedition Twin, Version B Double-rope, stamped frame, plastic grips, round top & 2 round bottom holes, pin cam stops, hybrid cam /w straight teeth, split ring & cable cam trigger, plastic safety levers in cam channel, QR pin safety
    Bob Thrun Collection, 2017
427 208 106 62 1358 16.5 25° (4.3)^5(4)
CMI Expedition Twin, Version C 3439 CMI Expedition Twin, Version C Double-rope, stamped frame, plastic grips, round top & 2 round bottom holes, pin cam stops, hybrid cam /w straight teeth, split ring & cable cam trigger, safety levers in cam channel, QR pin safety CMI, 2021 437 208 104 62 1336 16.5 25° (4.3)^5(4)
Jumar Tree 1968
2285
Jumar Tree Dual-handled double-rope, extruded frame, triangular top and round bottom holes, open-web cam /w straight teeth, tab safety below cam
  • Bob Thrun, 2014
  • Bob Thrun Collection, 2017
505 183 157 57 1641 16.0 29° (4.H)^2(3.H)^2(3.2.2)
Kong-Bonaiti double rope 1516 Kong-Bonaiti double rope Double Rope, stamped handle /w 2 riveted eccentric cam ascenders, oval & D top holes, round bottom hole, stamped cam stops, asymmetrical open-web cams /w sloping teeth, tab safety below cams Rostislav Burdenyuk, 2009 397 209 92 56 1070 15.4 30° (3)(4.H)^2(3.H)^2(2.2.1)
Kong Trender 1523
2291
Kong Trender Dual-handled double-rope, stamped frame, oval top holes, round bottom holes, stamped rope retainer /w carabiner, asymmetrical open-web cams /w sloping teeth, tab safety below cams
  • WesSpur Tree Equipment
  • Bob Thrun Collection, 2017
613 220 181 51 1707 15.2 30° (3)(4.H)^2(3.H)^2(3.2.2)
Kong Twin, Version A 210
2290
Kong Twin, Version A Dual-handled double-rope, stamped frame, round & D top holes, round bottom hole, stamped cam stops, asymmetrical open-web cams /w sloping teeth, tab safety below cams
  • WesSpur Tree Equipment, 2007
  • Bob Thrun Collection, 2017
466 204 165 51 1707 16.3 28° (3)(4.H)^2(3.H)^2(3.3.2)
Kong Twin, Version B 1529
2292
Kong Twin, Version B Dual-handled double-rope, stamped frame, round & D top holes, round bottom hole, stamped cam stops, asymmetrical open-web cams /w sloping teeth, pin safety below cams
  • Simon Holmes, 2009
  • Bob Thrun Collection, 2017
468 207 166 50 1707 16.3 29° (3)(4.H)^2(3.H)^2(3.2.2)
Krok G2 3403 Krok G2 3601_262.67 Dual-handled double-rope, stamped frame, round & D top holes, round bottom hole, stamped cam stops, ,  Krok, 2021 561 221 163 69 2490 15.6 31° (3.2.2)(1H1.2)^3(2.3.2)
Petzl Ascentree, Version A 275
2278
Petzl Ascentree, Version A Dual-handled double-rope, stamped frame, rubber grips, oval top & 2 round bottom holes, stamped cam stop, semi-open web cam /w straight teeth, plastic safety below cam
  • On Rope 1, 2009
  • Bob Thrun Collection, 2017
397 190 169 45 1436 15.0 30° (3.1.4)(1S1.1S0.2S2)^2(1S1)(2.3)
Petzl Ascentree, Version B 2041 Petzl Ascentree, Version B Dual-handled double-rope, stamped frames riveted together, rubber grips, 2 oval top and 1 subtriangular bottom holes, semi-web cam /w sloping teeth, plastic safety below cam On Rope 1, 2016 339 195 169 42 1388 14.5 32° (3.4)(1S1)^2(2S2)(1S1)^3(2.3.4.3)

Handled eccentric Cam Ascender Weight Chart Cast Milled Stamped