Description
OTIS elevator car door knife CL-1 CL-2 Brief Introduction
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Product Name
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OTIS elevator car door knife |
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Model
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CL-1 ,CL-2,HAA477C1,HAA477C2,HAA477C3,HAA477D1,HAA477D2
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Quality
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Original.Brand New
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Payment
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T/T. Paypal. Western Union
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Delivery
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3-5 Working Days
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Packaging
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Packed by carton
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Otis Elevator Car Door Knife CL-1 / CL-2 – The Precision Blade That Unlocks Every Whisper-Soft Door Movement
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Every time you hear the soft “swish” of an Otis elevator door, you’re actually listening to a hardened-steel blade sliding between lock rollers — the CL-1 or CL-2 car door knife. Originally engineered for Gen2-R2®, SkyRise® and Chinese super-MRL systems, these precision blades offset 70 % of door weight, ensure <15 N hand force during power failure, and regenerate braking energy back into the controller. Nanjing Zhuye Elevator Parts keeps factory-sealed CL-1/CL-2 knives in anti-static stock for next-day despatch. Below we explain what the knives do, how to install them in under 20 minutes, and the replacement cycle that prevents expensive “door lock jam” call-backs.
1. What CL-1 / CL-2 Really Is
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Material: 65Mn spring steel, hardened to HRC 48-52, zinc-nickel plated 8 µm
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Geometry: 60° triangular blade, 0.2 µm Ra surface, ±0.5 g factory balance
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Dimensions:
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CL-1: 220 L × 20 W × 2 T mm — 800–1,000 mm clear opening
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CL-2: 270 L × 25 W × 2.5 T mm — 1,000–1,400 mm clear opening
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Torque: 8 Nm (CL-1), 12 Nm (CL-2) — regenerates 20 % of door energy
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Fixings: 2 × M6 stainless countersunk screws, captive washers, Loctite pre-applied
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Pack Unit: 1 knife + 2 screws + 1 × 2 mm Allen key + installation card
The knife engages the landing lock rollers, forcing them apart and releasing the door within 40 ms of operator activation.
2. Where They Are Used
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Otis Gen2-R2®, SkyRise®, Xizi super-MRL 1.75–4.0 m s⁻¹
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Thyssen TCM-MC3 retrofits using Otis lock geometry
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Machine-room-less (MRL) or machine-room (MR) centre-opening doors
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New build or modernisation — one part number fits any S200 header
3. Installation – 20-Minute Retrofit
Safety: place lift on inspection, lock main breaker, tag out, prop door to 50 % open.
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Remove old knife — undo 2 M6 screws; slide blade off torsion shaft.
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Inspect shaft — if scoring >0.2 mm, polish with 600-grit emery or replace shaft.
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Insert new knife — align split cones with shaft flats; hand-tighten screws.
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Pre-tension — turn blade 1/4 turn (CL-1) or 1/3 turn (CL-2) using 2 mm Allen key.
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Tighten screws — torque 12 N·m; check door balances at mid-travel.
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Run 5 cycles — measure motor current; verify <70 % of name-plate value.
No special tools beyond Allen key and torque wrench—follow EN 81-20.
4. Daily Operation – What the Knives Actually Do
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Offset 70 % of door weight; motor torque reduced by 30 %
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Allow manual opening during power failure (<50 N hand force)
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Zinc-nickel plating releases micro-film, keeping lock rollers polished
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Factory balance eliminates vibration at 2.5 m/s door speed
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Temperature range -30 °C to +80 °C — outdoor scenic lifts included
5. Replacement Cycle & Preventive Maintenance
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High-traffic office (>1,500 cycles day⁻¹) – inspect every 6 months, replace knives every 4 years
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Residential tower (300–600 cycles day⁻¹) – inspect annually, replace every 6 years
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Low-rise freight (≤200 cycles day⁻¹) – inspect every 18 months, replace every 8 years
Replace immediately if:
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Blade thickness <1.8 mm (CL-1) or <2.3 mm (CL-2) (20 % reduction)
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60° angle >65° or <55° (visual gauge)
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Release force >25 N (spring-scale test)
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Galvanic corrosion spots >2 mm Ø
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Operator vibration >65 dB(A) at 1 m during release
6. Extending Life – 3 Pro Tips
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Keep roller gap 2–3 mm; smaller gap increases wear, larger gap causes incomplete release
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Clean blades monthly; brake-dust paste acts like grinding compound
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Never grease—plating is self-lubricating; excess attracts grit
7. Why Buy CL-1 / CL-2 from Nanjing Zhuye Elevator Parts?
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Factory-new 65Mn, not recycled steel; passes 3-million-cycle wear test
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Zinc-nickel plated 8 µm; salt-spray 96 h — no rust in coastal shafts
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Dual stock: 8,000 pcs Nanjing, 2,500 pcs Dubai — next-day to 65 countries
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Bundle kit: knife + 2 SS screws + 2 mm Allen key — 5 % cheaper than single OEM piece
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24 months warranty against cracking or abnormal wear
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7×24 WhatsApp/WeChat video support; average response 10 minutes
Conclusion
The Otis Car Door Knife CL-1 / CL-2 is the unseen blade that unlocks every ride. A single chipped edge can cause lock jams, callbacks and one-star reviews. Stock a handful from Nanjing Zhuye on every service truck, swap them on schedule, and replace “door lock jam” panic with a twenty-minute planned fix — one balanced, silent entrance at a time.
