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Quickcoupler Safety Double Lock

Double Lock

The new standard for safety in hydraulic quickcouplers

The new Double Lock safety standard ensures increased work safety on construction sites.
The ingenious system prevents the attachment from falling off in a purely mechanical manner in the event
of incorrect locking. A safety claw fitted in the middle between the coupling claws encloses the coupling
shaft in a form-fitting manner immediately after the lock is actuated and prevents the attachment from being
completely released in any position. The new, revised indicator pin provides information about the position
of the locking pins at any time.

Safety features of the Double Lock quickcoupler

  • purely mechanical fall protection
    • prevents the attachment from falling off
      in case of incorrect locking
    • robust, wear resistent
    • service friendly
  • new indicator pins
    • as indicator for the position of the locking pins
  • EuroTest certified

  • BG Bau eligible

  • surpasses all safety standards
    (EN474, ISO13031)


pick-up as usual for locking

possibility of unintentional
false locking

DL safety claw prevents falling off
of the attachment

attachment secure in every
position of the bucket cylinder


Double Lock - how it works

locking pins retracted,
safety claw Double Lock open

locking pins extended,
safety claw Double Lock closed

    • optical locking indicator,
      pin extended

    • safety claw
      open

    • optical locking indicator,
      pin retracted

    • safety claw
      closed

 unlocked 

 

 locked 

 


Double advantage - new housing generation

Optimized housing for all Double Lock quickcouplers with full compatibility

In the course of the Double Lock development, all housings were optimized in terms of their pick-up and
wear behavior and compact design, and some of the locking mechanisms were newly developed.

New housing features of the Double Lock quickcouplers

  • ƒwider coupling claws > more support surface > less wear
  • optimized claw geometry > easier pick-up of attachments
  • compatible with existing Lehnhoff adapters

example HS 08 (old)

HS 08 DL (NEW)

support surface + 70%


Features HS 10 - HS 25 / VL 100 - VL 250

  • ƒƒnew, lower construction > more compact addition of rotator / tiltrotator possible
  • housing cover strengthened and safe
  • new engineered locking mechanism
  • new emergency opening mechanism

example HS 10 DL

    • indicator pin

    • wider pick-up claws
      with optimized
      engagement procedure

    • new lower construction
      without the typical „hump“


Overview Double Lock quickcouplers
quickcoupler hydraulic HS 01 DL HS 03 DL HS 08 DL HS 10 DL HS 21 DL HS 25 DL
excavator class 0,5 - 1,9 t 2,0 - 6,0 t 6,1 - 12 t 12 - 19 t 19 - 28 t 28 - 38 t
length (mm) 235 295 400 520 545 545
width (mm) 180 200 290 395 495 600
weight ca. (kg) 15 30 85 170 270 310
adapter SW 01 SW 03 SW 08 SW 10 SW 21/25 SW 21/25
coupling shaft Ø (mm) 40 50 60 70 80 80
unlocking pressure min. (bar) 130 160 160 160 180 180
load hook load capacity 1 t 3 t 3 t / 5 t 8 t 10 t 10 t
wider support surface + 50% + 20% + 70% + 30% + 10% + 20%
Overview Double Lock quickcouplers
quickcoupler fully hydraulic VL 100 DL VL 210 DL VL 250 DL
excavator class 12 - 19 t 19 - 28 t 28 - 38 t
length (mm) 520 ca. 960 ca. 1020
width (mm) 395 600 710
weight ca. (kg) 270 370 490
adapter SW 10 SW 21/25 SW 21/25
coupling shaft Ø (mm) 70 80 80
unlocking pressure min. (bar) 160 180 180
load hook load capacity 2x 8 t 2x 10 t 2x 18 t
wider support surface + 30% + 10% + 20%
Double Lock in action

Double Lock brochure for download

© 2021 Lehnhoff Hartstahl GmbH

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