Hamilton Grange National Memorial

The primary challenge was to make the main floor accessible without compromising the historical character of the memorial. Specific constraints included:

• Invisibility of the Lift: The lift needed to be hidden when not in use.

• Limited Space: The small porch area required a compact solution, as the platform had to fit within a tight space (48” minimum length).

• Structural Complexity: The lift had to rise through the porch and retract beneath it while maintaining the integrity of the porch floor.

• Historical Preservation: All modifications had to comply with strict preservation standards as mandated by federal jurisdiction.

• Custom Guide System: Designed to support the car without projecting beyond the upper landing floor, using double roller assemblies riding on 8-# T-rails.

• Retractable Porch Floor: A telescopic tube system with an outer and inner frame was designed to allow the porch floor to lift with the car and return smoothly to its original position.

  • Beveled frames ensured smooth operation despite the porch’s sloped floor.

• Drive System: Utilized a Cemcolift telescopic cylinder to avoid drilling into the basement floor due to water table concerns.

  • A heater was installed in the hydraulic tank to address exposure to exterior temperatures.

• Passenger Safety:

  • Full-height enclosure with laminated glass for visibility and safety.

  • GAL interlock system for the wrought iron gate protecting the pit.

• Federal Compliance: The lift design was reviewed and approved by federal authorities, ensuring historical preservation standards were met.

• Operation: The lift is operated by National Park Service rangers using a constant-pressure control pendant located inside the main door, allowing the operator to ensure the area is clear before the lift is used.

The custom lift solution at Hamilton Grange successfully provides accessible entry to the historic home while preserving its aesthetic and historical integrity.

• Seamless Integration: The lift is virtually invisible when not in use, maintaining the memorial’s appearance.

• Safety and Accessibility: The design meets rigorous safety standards and ensures dignified accessibility for visitors.

• Federal Approval: The project showcases how innovative engineering can align with strict historical preservation requirements.