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False Stop Bobbins

Bobbins are mechanical descenders where the rope path follows the S-shaped path shown in the figure. In general the braking surface consists of two non-rotating bollards fixed to a sideplate, with a second pivoting sideplate provided to keep the rope from jumping off the other end of the bollards. A third (usually smaller) bollard may be provided. The seat maillon usually attaches to holes in extensions of the two sideplates; these holes are aligned when the sideplates pivot to the closed position.

I distinguish true bobbins from false bobbins by whether the spools (or bollards) move with respect to the frame. On true bobbins the center of the spools is fixed although the spools may rotate (on stop bobbins, the lower one usually does). On false bobbins, the center of the spools can move. I don't believe that there is necessarily any advantage of true bobbins over false bobbins or vice versa, it's merely a means of classification. All of my false bobbins are "stop" bobbins.

The Single Rope Technique bobbins are well made, but I find them to be tiring. If you try these and pay attention, you may notice that squeezing the handle actually lifts you. The Antec and Anthron work on a different pincipal, and do not have this problem. The Single Rope Technique bobbins are also heavy, due to their steel parts. The Butkovic is an old design that may never have been commercialized, but I find it to be most interesting.

[ Additional Comments on Bobbins ]

Gallery

 

Image ID Device Description Acquired Weight Height Width Thickness Std. volume
Antec Double Stop 546 Antec Double Stop Fixed frame, bobbins pivot on lower rivet, handle pivots on upper rivet Innner Mountain Outfitters, 1999 348 190 84 26 415
Anthron DSD-25 1287 Anthron DSD-25 Fixed frame, bobbins pivot on lower rivet, handle pivots on upper rivet Jansen Cardy, 2011 350 191 78 27 399
Anthron DSD-25 2422 Anthron DSD-30 Fixed frame, bobbins pivot on lower rivet, handle pivots on upper rivet Bob Thrun Collection, 2017 353 190 78 26 388
Anthron DSD 30+25 1152 Anthron DSD 30+25 Fixed frame, bobbins pivot on lower rivet, handle pivots on upper rivet Bret Auernig, 2008 334 191 79 27 404
Butkovic Clone 978 Butkovic Clone Two piece, fixed lower and auxiliary bollard on frame, sliding upper bollard on handle Dr. Gary D. Storrick, 2004 519 220 86 39 729
DBI-SALA/Rollgliss/SRTE D1S 1451 DBI-SALA/Rollgliss/SRTE D1S SS frame, steel bobbins & handle assembly, stamped gate, hole for no-stop pin. Amazon.com, 2015 702 224 83 37 687
DBI-SALA/Rollgliss/SRTE D2a 1455 DBI-SALA/Rollgliss/SRTE D2a Al frame, steel bobbins & handle assembly, stamped gate, hole for no-stop pin. Amazon.com, 2015 567 226 80 48 879
Magideal I-Block 2465 Magideal I-Block Fixed frame, bobbins pivot on lower rivet, handle pivots on upper rivet paska2016 (eBay, China), 2017 339 190 76 26 376
Singing Rock DSD 30+25 1233 Singing Rock DSD 30+25 Fixed frame, bobbins pivot on lower rivet, handle pivots on upper rivet Inner Mountain Outfitters, 2009 347 191 81 28 434
Singing Rock DSD plus 1460 Singing Rock DSD Plus Fixed frame, bobbins pivot on lower rivet, padded handle pivots on upper rivet Amazon.com, 2015 430 198 86 33 568
Single Rope Technique D1, Version A 1023 Single Rope Technique D1, Version A Steel double-rope bobbin & handle assembly, guide bar, stamped gate, holes for no-stop carabiner. Tom Vines, 2006 407 220 73 36 573
Single Rope Technique D1, Version B 445
2424
Single Rope Technique D1, Version B Steel bobbin & handle assembly, guide bar, stamped gate, no-stop carabiner hole.
  • Inner Mountain Outfitters, 1988
  • Bob Thrun Collection, 2017
407 225 75 35 591
Single Rope Technique D1a, Version A 519 Single Rope Technique D1a, Version A Steel bobbins & handle assembly, two guide bars, stamped gate, hole for no-stop pin. Inner Mountain Outfitters, 1996 467 227 79 37 664
Single Rope Technique D1a, Version B 1274 Single Rope Technique D1a, Version B Steel bobbins & handle assembly, two guide bars, stamped gate, hole for no-stop pin. Addie Mannan, 2010 466 227 83 37 698
Single Rope Technique D1DB 446
2425
Single Rope Technique D1DB Steel bobbin & handle assembly, guide bar, stamped gate, double brake, no-stop pin & hole.
  • Single Rope Technique, 1989
  • Bob Thrun Collection, 2017
523 245 98 41 984
Single Rope Technique D2, Version A 447 Single Rope Technique D2, Version A Steel double-rope bobbin & handle assembly, guide bar, stamped gate, holes for no-stop carabiner. Raven Products, 1990 498 222 73 46 745
Single Rope Technique D2, Version B 448
2423
Single Rope Technique D2, Version B Steel double-rope bobbin & handle assembly, guide bar, stamped gate,stamped gate, no-stop pin & holes.
  • Single Rope Technique, 1989
  • Bob Thrun Collection, 2017
509 222 73 46 745
Single Rope Technique DS1 1111 Single Rope Technique DS1 Steel bobbin & handle assembly, steel frame, guide bar, stamped gate, no-stop pin hole. Richard Wolfe, 2007 711 226 75 37 623
Single Rope Technique D2DB 449 Single Rope Technique D2DB Steel double-rope bobbin & handle assembly, guide bar, double brake, holes for no-stop pin. John E. Weinel, Inc., 1989 631 245 98 52 1249
Single Rope Technique RS1a 573 Single Rope Technique RS1a Steel bobbins & handle assembly, long braking arm, stamped gate, hole for no-stop pin. Single Rope Technique, 2000 716 227 84 43 815
Single Rope Technique RS2a 574 Single Rope Technique RS2a Steel bobbins & handle assembly, short braking arm, stamped gate, hole for no-stop pin. Single Rope Technique, 2000 654 227 83 43 808
Single Rope Technique RS6DBS 575 Single Rope Technique RS6DBS Steel frame, steel double-rope bobbin & handle assembly, rotating lower bollard, two guide bars, oversqueeze brake, stamped gate, holes for no-stop pin. Single Rope Technique, 2000 1058 249 114 50 1431
Single Rope Technique Two-way Rescue Stop 2WRS 950 Single Rope Technique Two-way Rescue Stop 2WRS Fixed frame, bobbins pivot on middle rivet, handle pivots on upper rivet, rope guide pivots on lower rivet On Rope, 2004 553 205 73 40 602
Skylotec Mark 1 1369 Skylotec Mark 1 Fixed frame, bobbins pivot on lower rivet, handle pivots on upper rivet Martin Keight, 2012 345 190 81 27 416

Stop Bobbins Bobbins Bobbin Weight Distribution