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Rope Grabs
Rocker Arm

Rope Grabs (a.k.a. Fall Arrests) are industrial devices used to protect workers in high places. Their function is to ensure that the worker doesn't perform the big splat when falling from high places; however, they are often used with safety belts that can cause a slower and far less spectacular death by suffocation. This can't be blamed on the rope grab, its the fault of the uninformed user.

My interest in rope grabs is that they are similar to ascenders, and suggest alternate ideas for ascender design. I often discuss these in this context instead of the context of their intended use.

All of the rope grabs on this page have rocker arms similar to those found on Rocker Arm Ascenders. Any of these can be used as an ascender; however, like the Rocker Arm Ascenders, using any of these as an ascender results in considerable lost motion with each step, causing a substantial loss of efficiency.

Gallery

Image ID Device Description Acquired Weight Height Width Thickness Std. volume
Camp Goblin 1859
2369
Camp Goblin Forged Al frame & swinging side plate, forged ss levers & anvil
  • Patroller Supply, 2015
  • Bob Thrun Collection, 2017
278 75 86 28 184
Camp Goblin (prototype) 1810 Camp Goblin (prototype) Forged Al frame & swinging side plate, forged ss levers & anvil, unmarked prototype Denis Pivot, 2013 272 71 65 29 134
Climbing Technology Easy Move, Version A 1836 Climbing Technology Easy Move, Version A  Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Expé-Spelemat, 2014 202 69 81 24 134
Climbing Technology Easy Move, Version B 1837 Climbing Technology Easy Move, Version B Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Lior Porian, 2015 202 69 81 24 134
DMM Buddy BUD100 1863 DMM Buddy BUD100 Forged Al side plates, pivoting Al arm, fixed anvil, for 11-13 mm. rope Arbor Tech Supply, 2012 200 64 103 28 186
DMM Buddy 1777
2641
DMM Buddy BUD200 Forged Al side plates, pivoting Al arm, fixed anvil
  • Arbor Tech Supply, 2012
  • Bob Thrun Collection, 2017
200 64 103 28 186
heightec-PMI Vector 1707
2636
heightec-PMI Vector D23A Stamped Al side plates, pivoting cast steel cam, cast Al anvil
  • On Rope 1, 2010
  • Bob Thrun Collection, 2017
219 69 101 29 198
ISC Red 1858 ISC Red Stamped Al side plates, pivoting cams, anvil Patroller Supply, 2015 209 104 97 30 295
ISC Rocker 2637 ISC Rocker Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Bob Thrun Collection, 2017 168 70 115 29 235
Kong Back-Up 1716
2650
Kong Back-Up Stamped Al side plates, SS pivoting cams, SS anvil
  • On Rope 1, 2010
  • Bob Thrun Collection, 2017
209 65 95 26 156
Krok Drop Model 1 1599 Krok Drop Model 1 Stamped Al side plates, steel pivoting cam, steel anvil Krok (Alex Dniprovsky & Alex Kostromitinov), 2012 157 80 67 29 154
Krok Drop Model 2 221 Krok Drop Model 2 Stamped steel side plates, steel pivoting cam, steel anvil PetrenkoWorld, 2007 225 83 66 29 158
Krok Drop Model 3 1775 Krok Drop Model 3 Aluminum side plates, pivoting steel arms, fixed anvils, double rope Gear4Rocks, 2012 303 80 65 51 264
Krok Drop Model 4 1774 Krok Drop Model 4 Aluminum side plates, pivoting steel arm and Al actuator, fixed anvil, lever lock Gear4Rocks, 2012 191 91 74 30 203
Krok Drop Model 5 1593
1598
Krok Drop Model 5 Stamped steel side plates, steel pivoting cam, cam lock, & latch, steel anvil
  • Gear4Rocks, 2012
  • Krok (Alex Dniprovsky & Alex Kostromitinov), 2012
254 65 80 27 140
Krok Drop "ST" 2820 Krok Drop "ST"
(Капля "ST")
Stamped steel side plates, steel pivoting cam, steel anvil Krok, 2021 211 81 68 30 162
Krok Drop-Roll 1805 Krok Drop-Roll Stamped steel side plates, steel pivoting cam, steel anvil, steel pulley Gear4Rocks, 2013 246 80 67 28 152
Krok Equilibrium Set 2021 Krok Drop-Roll
(Капля-РОЛ)
with Equilibrium Set
(Набор "Эквилибр")
Stamped Al side plates, Al pivoting cam, Al anvil, Al handle Krok, 2021 309 154 145 28 621
Mittlemann KB2 2706 NTR Rocker Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Andy (China), 2017 173 114 69 29 229
Protecta International AC400 Viper 784 Protecta International AC400 Viper Steel, spring-loaded pivot arm, fixed anvil Inner Mountain Outfitters, 2003 439 93 110 27 280
Proverti AC080 1874 Proverti AC080 Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Ondřej Belica, 2015 193 66 120 29 230
Proverti AC081 1875 Proverti AC081 SS side plates, spring-loaded pivot arm, fixed anvil, lever lock Ondřej Belica, 2015 333 68 111 26 192
Singing Rock Rocker 1754 Singing Rock Rocker Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Outdoors Etc., 2012 174 118 68 29 231
SMC Grip 2703 SOB Grab Forged Al frame & swinging side plate, forged ss levers & anvil Suntek, 2017 184 65 98 23 149
Tractel Stopfor B 2806 Tractel Stopfor B Steel plates, steel rocker arm, latch pin & lever, for 5/8" rope Windows101, 2021 370 113 71 35 281
Troll Rocker, Version A 742 Troll Rocker, Version A Al side plates, spring-loaded pivot arm, fixed anvil Troll, 2000 162 113 65 30 216
Troll Rocker, Varsion B 2776 Troll Rocker, Version B Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock equipment Outdoors, 2019 167 114 65 29 215
Vento Rocker 2763 Vento Rocker Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Artyom Babin (Артём Бабин), 2019 179 113 65 30 219
Xinda Rocker 1830 Xinda Rocker Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Gold Bucket, 2014 168 114 64 29 214
Yates Rocker 778 Yates Rocker Al side plates, spring-loaded pivot arm, fixed anvil, lever lock Mountain Gear, 2003 163 115 65 29 219
Z&W Rocker 2764 Z&W Rocker Aluminum side plates, spring-loaded pivot arm, fixed anvil, lever lock Accessories Mall, 2019 177 116 66 30 227

ype 1 Lever Cam Others Rope Grab Weight Chart