This adjustment mechanism/assembly for a backrest/headrest includes a series of parts connected by a threaded rod with a knob on each end. The parts are arranged such that they sandwich two support members so that when the knobs are loosened the unit can easily slide up and down, changing the elevation of the backrest/headrest pad unit with respect to a seat bottom or seat back. Further, when the knobs are loose the upper member and its attached pad can be pivoted fore and aft and slide back and forth. Tightening the two knobs locks the entire unit in place.

A bicycle control device is provided for providing a comfortable traveling environment to the rider. The bicycle control device basically includes an electronic controller controlling an operational state of an electric auxiliary drive, which assists in travel of a bicycle, based on an operational state of a suspension. The bicycle control device can be included in an electric auxiliary drive, a suspension and/or an adjustable seatpost.

A fluid fillable cushioning device comprises an enclosure comprising a top wall and a bottom wall, a cavity defined by the enclosure, a threaded inlet in the enclosure connected to the cavity, the cavity further defined by the threaded inlet, and a fastening mechanism extending from the enclosure, the fastening mechanism configured to fasten the cushioning device to a seat. In operation, fluid, such as water, is filled in the cavity of the cushioning device, and in some cases foam is also included in the cavity, providing a water and/or foam cushion for a user sitting on the cushioning device. When used on seat of a bicycle, where the user's body interacts with the cushioning device with significant pressure for extended period of time, the cushioning device provides customizable cushioning which feels like an extension of the body, and is exceptionally comfortable.

A safe two-wheeled self-balancing vehicle includes two power wheels, a motion sensor, a control circuit, a chassis structure, a direction control input device, and a power source. The power wheels are installed at two sides of the chassis structure. The motion sensor is connected to the control circuit and fixed to the chassis structure opposite thereto. The direction control input device is connected to the control circuit. The control circuit drives the power wheels. A protection wheel support is disposed at a front side or both the front side and a rear side of the chassis structure. A floating protection wheel is installed at a front end of the protection wheel support. The protection wheel support is connected with the chassis structure or a structure of the protection wheel support, which enables the floating protection wheel to move freely in a vertical direction with respect to the chassis structure.

A safe two-wheeled self-balancing vehicle includes two power wheels, a motion sensor, a control circuit, a chassis structure, a direction control input device, and a power source. The power wheels are installed at two sides of the chassis structure. The motion sensor is connected to the control circuit and fixed to the chassis structure opposite thereto. The direction control input device is connected to the control circuit. The control circuit drives the power wheels. A protection wheel support is disposed at a front side or both the front side and a rear side of the chassis structure. A floating protection wheel is installed at a front end of the protection wheel support. The protection wheel support is connected with the chassis structure or a structure of the protection wheel support, which enables the floating protection wheel to move freely in a vertical direction with respect to the chassis structure.

The seat comprises a padded body (2) and at least one heating element (4), and also at least one cavity (3) in said padded body (2), in the interior of which said at least one heating element (4) is arranged. The assembly method comprises the stages of forming at least one cavity (3) in said padded body (2); and arranging said at least one heating element (4) in the interior of said at least one cavity (3). It makes it possible to enhance the positioning accuracy of the heating elements and enables greater speed of execution.

The seat comprises a padded body (2) and at least one heating element (4), and also at least one cavity (3) in said padded body (2), in the interior of which said at least one heating element (4) is arranged. The assembly method comprises the stages of forming at least one cavity (3) in said padded body (2); and arranging said at least one heating element (4) in the interior of said at least one cavity (3). It makes it possible to enhance the positioning accuracy of the heating elements and enables greater speed of execution.

A multi-degree-of-freedom riding saddle including a support portion configured to be connected to a bicycle frame and two seat plates disposed respectively corresponding to two thighs on two sides of a rider. A linkage portion is between the two seat plates and the support portion. The linkage portion to control front ends of the two seat plates in a riding direction to rise and fall in an alternating reciprocation linkage mode and control a front end of one of the seat plates in the riding direction to push, during falling, the other seat plate to rise entirely. Through the foregoing arrangement, during riding, the two seat plates can not only achieve rising and falling of the front ends in the alternating reciprocation linkage mode, but also achieve entire rising and falling of the seat plates during the rising and falling of the front ends, thereby improving comfort and saving labor.

An electric seatpost assembly comprises a first member, a second member, a positioning structure, a controller, and a switch unit. The second member is movably coupled to the first member so as to change a length of the electric seat post assembly. The positioning structure is configured to position the second member relative to the first member. The controller is to control the positioning structure. The switch unit is provided on one of the first member and the second member to transmit at least one electric signal to the controller.

An electric seatpost assembly comprises a first member, a second member, a positioning structure, a controller, and a switch unit. The second member is movably coupled to the first member so as to change a length of the electric seat post assembly. The positioning structure is configured to position the second member relative to the first member. The controller is to control the positioning structure. The switch unit is provided on one of the first member and the second member to transmit at least one electric signal to the controller.