Backpack Frame vs. Gantry Frame: How SOLKER's Patented Structure Ends the "Unbalanced Loading" Pain in Home Elevators

When selecting a home elevator for a villa, the structural type is often the decisive factor for long-term user experience. The backpack frame structure—with all guide rails and counterweights arranged on one side of the car and no rails on the other—achieves exceptional hoistway utilization-. For the same shaft size, a backpack elevator offers a larger net car area-, making it particularly suitable for compact spaces like small shafts and top-floor duplexes-. More flexibly, the backpack frame accommodates single-opening, through-opening, 90° right-angle doors, and even three-side opening configurations-, granting architects and homeowners remarkable design freedom-. However, every structure comes with trade-offs. The backpack's "cantilever" single-side loading—like a forklift hoisting a load, with the car hanging on one side like a backpack-—means the counterweight hangs unilaterally. Over time, guide shoe wear accelerates, car stress becomes uneven-, and the higher the lift height, the greater the unilateral stress, eventually leading to slight sway, abnormal noise, or even vibration-. Eccentric loading issues become prominent, and failure rates along with maintenance costs rise accordingly-. Recognizing this structural flaw, SOLKER has pioneered a deeply innovative, patented gantry frame structure-. This design supports the car from four corners like a "sedan chair," ensuring uniformly distributed forces-. During operation, the center of gravity remains perfectly centered, making even the most sensitive riders barely feel any sway-. More importantly, SOLKER's patented gantry does not sacrifice space—it significantly increases usable shaft dimensions while solving the single-side loading problem, proving that "stability" and "space" no longer have to be mutually exclusive choices-. That is why SOLKER firmly recommends the gantry frame structure: not because the backpack frame is inadequate, but because a better solution has already arrived.