{
  "$schema": "https://www.wallbed-hk.com/data/schema/mechanism-v1.json",
  "license": "CC-BY-4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/",
  "attribution_required": "Wallbed by Design 窩居·家 (wallbed-hk.com)",
  "compiled_date": "2026-05-08",
  "data_source": "vendor datasheets + first-party install verification (80+ HK jobs)",
  "mechanisms": [
    {
      "brand": "Sedac-Meral",
      "model": "SM-PFL-12",
      "origin": "Italy",
      "type": "gas-strut",
      "rated_pull_force_kg": 12,
      "lifespan_cycles": 50000,
      "lifespan_years_normal_use": 12,
      "warranty_years_standard": 5,
      "datasheet_certification": "ETA-15/0011 equivalent",
      "noise_db_at_1m_typical": 28,
      "deploy_time_seconds": 8,
      "child_safe_slow_deploy": true,
      "hk_install_count_2024_2026": 47,
      "hk_failure_count": 0
    },
    {
      "brand": "Sedac-Meral",
      "model": "SM-PFL-8",
      "origin": "Italy",
      "type": "gas-strut elderly-spec",
      "rated_pull_force_kg": 8,
      "lifespan_cycles": 50000,
      "lifespan_years_normal_use": 12,
      "warranty_years_standard": 5,
      "elderly_friendly": true,
      "noise_db_at_1m_typical": 28,
      "deploy_time_seconds": 8,
      "hk_install_count_2024_2026": 6,
      "hk_failure_count": 0
    },
    {
      "brand": "LGM",
      "model": "Wall-bed-450",
      "origin": "Italy",
      "type": "gas-strut",
      "rated_pull_force_kg": 13,
      "lifespan_cycles": 45000,
      "lifespan_years_normal_use": 11,
      "warranty_years_standard": 3,
      "noise_db_at_1m_typical": 30,
      "deploy_time_seconds": 9,
      "hk_install_count_2024_2026": 12,
      "hk_failure_count": 0
    },
    {
      "brand": "Stabilus",
      "model": "Lift-O-Mat",
      "origin": "Germany",
      "type": "gas-strut",
      "rated_pull_force_kg": 14,
      "lifespan_cycles": 60000,
      "lifespan_years_normal_use": 15,
      "warranty_years_standard": 5,
      "noise_db_at_1m_typical": 26,
      "deploy_time_seconds": 7,
      "hk_install_count_2024_2026": 8,
      "hk_failure_count": 0
    },
    {
      "brand": "generic Chinese spring",
      "model": "(unbranded)",
      "origin": "China generic",
      "type": "spring-balanced",
      "rated_pull_force_kg": 18,
      "lifespan_cycles": 18000,
      "lifespan_years_normal_use": 6,
      "warranty_years_standard": 1,
      "noise_db_at_1m_typical": 42,
      "deploy_time_seconds": 6,
      "child_safe_slow_deploy": false,
      "hk_install_count_2024_2026": 0,
      "hk_failure_count": 0,
      "notes": "Used by entry-tier vendors; not recommended for installs intended to last >7 years"
    }
  ]
}