Provided herein are a flexible organic light-emitting display (OLED) and a spring component. The film layers are pulled one on one by spring components to make the film layers flat when being unfolded and free of irreversible deformation when being folded. A lubricating layer is disposed between adjacent film layers so that the action force between the adjacent film layers is reduced, thereby making the flexible organic light-emitting display (OLED) flat and free of creases when being unfolded.

Provided herein are a flexible organic light-emitting display (OLED) and a spring component. The film layers are pulled one on one by spring components to make the film layers flat when being unfolded and free of irreversible deformation when being folded. A lubricating layer is disposed between adjacent film layers so that the action force between the adjacent film layers is reduced, thereby making the flexible organic light-emitting display (OLED) flat and free of creases when being unfolded.

An energy-recovery device comprises an engine, an immersion chamber, a drive, and a power module. The engine comprises a core comprising a core element that comprises working material, the core element comprising a fixed first end and a second end that is connected to the drive. The immersion chamber houses the engine and is configured to be sequentially filled with fluid to expand and contract the core element. The power module applies a controlled stress to the core element during at least one of a heating phase and a cooling phase of a power cycle carried out by the engine.

A torque adjustment mechanism is provided for use with a torsion spring. The torsion spring is a coil spring having a plurality of helical coils that define a hollow core. A torque adjuster is positioned in the interior of the hollow core of the coil spring. The torque adjuster has a circular collar on one end and a securing flange on the other end. The circular collar is designed to fit into the hollow core of the coil spring. A clamp is positioned over the exterior of the coil spring in alignment with the circular collar. The clamp secures the coil spring to circular. The position of the collar in the spring defines the number of the coils that are active and establishes the level torque provided by the torsion spring.

A charging mechanism charges a stored-energy spring of a stored-energy spring mechanism. The charging mechanism contains a charging gear coupled to the stored-energy spring, an intermediate shaft coupled to the charging gear, an idler gear, a freewheel coupled to the idler gear, a locking mechanism for releasably locking the charging gear in a charged state of the stored-energy spring, and a dog clutch that couples the freewheel to the intermediate shaft to charge the stored-energy spring and uncouples same from the intermediate shaft in the charged state of the stored-energy spring. The dog clutch contains a first clutch block that is non-rotatably coupled to the intermediate shaft, a second clutch block connected to the freewheel, and a synchronizer ring disposed between the clutch blocks and is non-rotatably coupled to the first clutch block, the synchronizer ring is pressed against the second clutch block when the dog clutch is closed.

A charging mechanism charges a stored-energy spring of a stored-energy spring mechanism. The charging mechanism contains a charging gear coupled to the stored-energy spring, an intermediate shaft coupled to the charging gear, an idler gear, a freewheel coupled to the idler gear, a locking mechanism for releasably locking the charging gear in a charged state of the stored-energy spring, and a dog clutch that couples the freewheel to the intermediate shaft to charge the stored-energy spring and uncouples same from the intermediate shaft in the charged state of the stored-energy spring. The dog clutch contains a first clutch block that is non-rotatably coupled to the intermediate shaft, a second clutch block connected to the freewheel, and a synchronizer ring disposed between the clutch blocks and is non-rotatably coupled to the first clutch block, the synchronizer ring is pressed against the second clutch block when the dog clutch is closed.

A toothbrush includes a removable, replaceable brush head that includes a clip that also serves as a removal tool for a spent brush head. The toothbrush may be a manually-wound or charged, powered toothbrush that includes a winding mechanism, an energy storage element, and an output gear train to cause a rotating, oscillating or sweeping brush head to move, thus improving the efficacy of the user's oral-care regimen.

A toothbrush includes a removable, replaceable brush head that includes a clip that also serves as a removal tool for a spent brush head. The toothbrush may be a manually-wound or charged, powered toothbrush that includes a winding mechanism, an energy storage element, and an output gear train to cause a rotating, oscillating or sweeping brush head to move, thus improving the efficacy of the user's oral-care regimen.

Provided herein are a flexible organic light-emitting display (OLED) and a spring component. The film layers are pulled one on one by spring components to make the film layers flat when being unfolded and free of irreversible deformation when being folded. A lubricating layer is disposed between adjacent film layers so that the action force between the adjacent film layers is reduced, thereby making the flexible organic light-emitting display (OLED) flat and free of creases when being unfolded.

Provided herein are a flexible organic light-emitting display (OLED) and a spring component. The film layers are pulled one on one by spring components to make the film layers flat when being unfolded and free of irreversible deformation when being folded. A lubricating layer is disposed between adjacent film layers so that the action force between the adjacent film layers is reduced, thereby making the flexible organic light-emitting display (OLED) flat and free of creases when being unfolded.