Samsung Patents a Spiral-Driven Hinge Mechanism for Foldable Phones

By Patentlyze Team · Updated May 22, 2026

The hinge is the most mechanically stressed part of any foldable phone — and Samsung is quietly rethinking how it works from the inside out, using interlocking spiral structures to control the fold motion.

What Samsung's spiral hinge actually does to your fold

Imagine a foldable phone's hinge as a tiny piece of origami engineering: every time you open or close the phone, two halves have to rotate in sync without grinding, wobbling, or wearing out. That's a surprisingly hard problem to solve at phone scale.

Samsung's patent describes a hinge where two spiral-shaped rotating members — one connected to each half of the phone — mesh with a sliding piece that rides along their grooves. When you fold or unfold the device, the spirals turn and push that slide member along a track, keeping both halves moving together in a controlled, coordinated way.

Think of it like a double-threaded bolt: turning it naturally moves a nut along its length. Samsung is applying that same mechanical logic to a phone hinge, which could mean a smoother, more consistent fold feel and potentially better long-term durability than gear-based or cam-based hinge designs.

How the spiral members and slide translate rotation into motion

The patent describes a hinge structure built around two spiral rotating members — one anchored to each housing of the foldable device. Each spiral member has two rotating portions with a gap (an "empty space") between them.

A central slide member threads through both spiral members. It has two spiral portions of its own, each sitting inside the empty space of the corresponding spiral rotating member. When either housing rotates — say, when you open the phone — the spiral on that side turns, and its geometry forces the slide member to travel linearly along the rotational axis (think of a screw driving a nut forward).

The patent also describes:

• Guide members that surround each spiral rotating member, keeping them aligned and constrained
• A rotation bracket that houses both rotating members within a unified rotation structure
• The entire assembly connecting the two housings while accommodating a flexible display that spans both

The key mechanical insight is that the slide member's linear movement is derived directly from rotation — no separate gears, cams, or linkages are needed to synchronize the two halves. The spiral geometry does the work.

What this means for Galaxy Z Fold durability and feel

Hinge reliability is the single biggest engineering liability in foldable phones. Galaxy Z Fold and Z Flip devices have improved substantially since 2019, but hinge wear, creak, and inconsistent resistance remain real concerns for long-term users. A spiral-driven mechanism that converts rotational motion to linear sliding with fewer discrete parts could reduce mechanical play and wear points over hundreds of thousands of fold cycles.

For you as a buyer, this kind of patent signals Samsung is still actively iterating on the fundamental mechanics of folding — not just the software or the display. Whether this specific design makes it into a shipping Galaxy Z Fold device is unknown, but it reflects ongoing investment in making the fold feel less like a liability and more like a feature.

Editorial commentary on a publicly published patent application. Not legal advice.