Description
Triangular lock for elevator hall door
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Product
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Triangular lock for elevator hall door |
| Triangular lock | |
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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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Triangular Lock for Elevator Hall Door – The 3-Point Sentinel That Secures Every Landing
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Every passenger assumes an elevator will stop exactly level and open only when it is safe. Behind that assumption is a small, mechanically-positive device hidden in the landing door header — the triangular lock. Named after its 60°-angled striker, this SIL-2 certified lock ensures hall doors remain closed until the car is within ±5 mm and the door motor actively releases the latch. Nanjing Zhuye Elevator Parts keeps factory-sealed triangular locks in anti-static stock for next-day despatch. Below we explain what the lock does, how to install it in under 15 minutes, and the replacement cycle that prevents expensive “landing door fault” call-backs.
1. What Triangular Lock Really Is
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Type: mechanically-positive, SIL-2 certified, universal landing door
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Material: zinc-nickel plated steel, -25 °C to +70 °C, IP54
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Contacts: 2 × NO + 1 × NC, gold-plated, 4 A 250 VAC, >1 million cycles
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Geometry: 60° triangular striker, 25 mm stroke, <15 N release force
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Fixings: M6 stainless screws, captive washers, Loctite pre-applied
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Pack unit: 1 lock + 2 keys + 4 screws + 1 × 2 mm Allen key
The lock engages when the car door knife rotates the striker; it releases only when the car is level and the motor issues a 24 VDC “door open” command.
2. Where It Is Used
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Otis Gen2®, Gen2-Life®, SkyRise® 1.0–4.0 m s⁻¹
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Thyssen TCM-MC3 retrofit kits
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Chinese MRL controllers with 24 VDC safety chains
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Suitable for landing doors 800–1,400 mm clear width, centre or side opening
3. Installation – 15-Minute Retrofit
Safety: place lift on inspection, lock main breaker, tag out, prop car to floor level.
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Remove old lock — undo 2 M6 screws; unplug 6-way Molex.
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Inspect striker — if worn >0.5 mm, replace striker (Nanjing Zhuye part ST-T60).
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Insert triangular lock — push into 22 mm hole until snap-ring clicks; earth strap to PE.
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Connect plug — brown +24 V, blue 0 V, white NO, grey NC, green earth.
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Test engagement — run car to floor; lock must click within ±5 mm level.
No laptop is required; the lock is pre-wired and calibrated at the factory.
4. Daily Operation – What the Lock Actually Does
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Engages when car door knife rotates 60° striker; releases only on 24 VDC command
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Auto-detects mis-level; drops safety chain within 50 ms if car >±10 mm
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LED indicator: green = locked, red = unlocked, off = no power
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Built-in self-test every 24 h — if contact resistance >100 mΩ, “Landing Lock Fault” is logged
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IP54 gasket resists car-wash water jets; UV-stabilised housing prevents yellowing
5. Replacement Cycle & Preventive Maintenance
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High-traffic metro (>1,500 trips day⁻¹) – inspect every 6 months, replace lock every 3 years
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Shopping mall (600–1,000 trips day⁻¹) – inspect annually, replace every 5 years
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Low-rise office (≤400 trips day⁻¹) – inspect every 18 months, replace every 7 years
Replace immediately if:
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Striker angle >65° or <55° (visual gauge)
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Contact resistance >100 mΩ at 1 A
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LED off with 24 V present
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Housing cracked or striker worn <1 mm thickness
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Water ingress (fog inside lens)
6. Extending Life – 3 Pro Tips
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Keep striker angle 60°; larger angle increases wear, smaller causes incomplete release
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Clean striker monthly; brake-dust paste acts like grinding paste
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Torque M6 screws to 8 N·m; over-tightening cracks the housing
7. Why Buy Triangular Lock from Nanjing Zhuye Elevator Parts?
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Factory-new, not refurbished; passes 1,000,000-cycle engagement test at 60 °C
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Striker angle pre-machined; matches Otis original geometry, no re-adjustment required
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Anti-static foam box + silica gel — safe for air freight
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Dual stock: 520 pcs Nanjing, 180 pcs Dubai — next-day delivery to 65 countries
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Bundle kit: lock + 2 keys + 6-way plug + 22 mm hole-saw — 5 % discount
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24 months warranty against mechanical wear or contact failure
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7×24 WhatsApp/WeChat video support; average response 10 minutes
Conclusion
The triangular lock for elevator hall doors is the unseen gatekeeper that secures every landing. A single worn striker can shut down an entire shopping mall. Stock a spare from Nanjing Zhuye on every service truck, swap it on schedule, and replace “landing door fault” panic with a fifteen-minute planned fix — one safe, level entrance at a time.
