Apple on Tuesday was granted a U.S. patent describing multiple methods of creating a self-adjusting Apple Watch band, designs that could one day replace magnetic clasps, velcro and other fasteners seen in current generation hardware, says Appleinsider.
As assigned by the U.S. Patent and Trademark Office, Apple’s U.S. Patent No. 9,781,984 for “Dynamic fit adjustment for wearable electronic devices” details methods in which a wearable device, like Apple Watch, can tighten or loosen an attached strap via an onboard tensioner.
In Apple’s documents notes they revealed that watch bands are often “cumbersome” or “require multiple steps to achieve a desired fit”, or need specialized tools that are often “inconvenient to adjust”. Additionally, traditional methods often fail to offer size increments suitable for all users, leading to an imperfect fit.
Aside from being uncomfortable, less than ideal sizing could negatively impact Apple Watch sensor readings, from the bespoke heart rate sensor to data collected by sensitive accelerometers. The effect can become pronounced during exercise, for example, when the device may become loose due to sweat and repeated motion.
To facilitate ease-of-use and device efficiency, Apple proposes a system capable of automatically, or at a user’s request, adjusting band sizing through a tensioner mechanism.
The document details a number of potential solutions for system tensioning including embedded shape memory wire, an internal ratcheting apparatus, gas or fluid bladders (standalone or built into the strap), retractable band elements and extendable portions of the device housing, says Appleinsider. With the latter method, a portion or portions of an Apple Watch chassis, or alternatively its band, extend out toward a user’s skin, thereby tightening the band’s fit.
Multiple function modes are paired with each tensioning method, the most prevalent being tightening and loosening, or more accurately contracting and expanding. For certain embodiments, specifically those in which a band’s material can affect fit, the patent describes flexibility and rigid modes that serve roughly the same purpose as tightening and loosening operations.
In some embodiments, the tensioner mechanism is automatically activated based on a set of predetermined criteria which can include user detection via the biometric sensor stack. Other methods allow for user customization through an onscreen UI. For example, users can select from set fit levels or instruct the device to make its band tighter or looser.