A bike having an expanded knife ski device includes left and right landing wheel arms on the left and right portions of the bike, respectively. Left and right landing wheels are rotatably coupled to the lower end of the left and right landing wheel arm, respectively, to move the landing wheels up and down. Left and right driving units lift and lower the left and right landing wheels, respectively. Left and right ski mounting sockets are coupled to the left and right landing wheel arms, respectively. Left and right insertion members couple to the left and right ski mounting sockets, respectively. Left and right ski legs are integrally coupled to the left and right insertion members, respectively, to extend downwards. Left and right bike skis, which are hinge-coupled to the lower end of the left and right ski legs, respectively, each making a hinge movement about a left/right horizontal axis.

A balance board coupled to a two-wheeled vehicle to provide a moving platform that an operator of the vehicle can use to stabilize the vehicle. The balance board includes a coupling mechanism, a frame, one or more moving elements, and one or more foot support pedals. In one example, the balance board is mechanically passive such that the balance board maintains contact with the ground surface without an externally applied force (e.g., by the operator/user of the vehicle). In one aspect, the balance board may be rotatable about multiple rotational degrees of freedom to allow the balance board to steer as the vehicle turns.

A balance board coupled to a two-wheeled vehicle to provide a moving platform that an operator of the vehicle can use to stabilize the vehicle. The balance board includes a coupling mechanism, a frame, one or more moving elements, and one or more foot support pedals. In one example, the balance board is mechanically passive such that the balance board maintains contact with the ground surface without an externally applied force (e.g., by the operator/user of the vehicle). In one aspect, the balance board may be rotatable about multiple rotational degrees of freedom to allow the balance board to steer as the vehicle turns.

A bike having an energy recovery device includes a driving wheel that is coupled to a rear wheel driving shaft pulley of the bike and rotates with the rear wheel of the bike. When a wire is pulled by the bike rider, an outer peripheral surface of a rotating wheel contacts an outer peripheral surface of the driving wheel and rotates together by means of friction with the driving wheel. When the wire pulling force is released, contact with the driving wheel is released. A piston moves in the forward/backward direction inside a cylinder of a compressor. During operation, air is compressed by the movement of the piston, exits through an exhaust opening formed on the rear portion of the cylinder, and is stored in an air tank through an air hose.

A bike having an energy recovery device includes a driving wheel that is coupled to a rear wheel driving shaft pulley of the bike and rotates with the rear wheel of the bike. When a wire is pulled by the bike rider, an outer peripheral surface of a rotating wheel contacts an outer peripheral surface of the driving wheel and rotates together by means of friction with the driving wheel. When the wire pulling force is released, contact with the driving wheel is released. A piston moves in the forward/backward direction inside a cylinder of a compressor. During operation, air is compressed by the movement of the piston, exits through an exhaust opening formed on the rear portion of the cylinder, and is stored in an air tank through an air hose.

The present invention relates to a bike having an energy recovery device, comprising: a driving wheel coupled to a rear wheel driving shaft pulley of the bike such that, when the rear wheel of the bike rotates, the same rotates together; a wire configured such that, when the bike driver operates a wire pulling means, the same is pulled to the front; a compressor support portion coupled to the rear end of the wire such that, when the wire is pulled, the same makes a hinge movement about a hinge shaft; a rotating wheel rotatably coupled to the compressor support portion and configured such that, when the compressor support portion is pulled to the end by the wire, the outer peripheral surface of the rotating wheel contacts the outer peripheral surface of the driving wheel by means of the hinge movement of the compressor support portion and rotates together by means of friction with the driving wheel and, when the wire pulling force is released, contact with the driving wheel is released; a compressor comprising a cylinder, which is coupled to the compressor support portion, a piston, which moves in the forward/backward direction inside the cylinder, and a connecting rod, the rear end of which is coupled to the piston such that the same penetrates a front hole of the cylinder and protrudes to the front; and a connecting cam configured to rotate about a rotating wheel shaft, which is coupled to the rotating wheel, and rotatably coupled to the front end of the connecting rod at a distance from the rotating wheel shaft such that, when rotating together with the rotating wheel, the part coupled to the connecting rod makes a circular movement, thereby making the connecting rod reciprocate in the forward/backward direction, wherein air that has flown in through an intake opening, which is formed on the rear portion of the cylinder, and which is provided with a check valve, is compressed by the movement of the piston, exits through an exhaust opening formed on the rear portion of the cylinder, and is stored in an air tank through an air hose.

The present invention relates to a bike having an automatic landing wheel apparatus. The bike having the automatic landing wheel apparatus, according to the present invention, comprises: a left landing wheel arm provided on the left side of the bike to vertically move a left landing wheel that is rotatably coupled to the lower end portion thereof; a right landing wheel arm provided on the right side of the bike to vertically move a right landing wheel that is rotatably coupled to the lower end portion thereof; a left driving unit for driving the left landing wheel arm to move the left landing wheel upward and downward; a right driving unit for driving the right landing wheel arm to move the right landing wheel upward and downward; a speed detection unit that detects the speed of the bike; and a controller connected with the speed detection unit, the left driving unit, and the right driving unit to move both or one of the left and right landing wheels upward when the speed detected by the speed detection unit exceeds a set speed and to move both or one of the left and right landing wheels downward when the speed detected by the speed detection unit is lower than or equal to the set speed.

The present invention relates to a bike having an expanded knife ski device. The bike having an expanded knife ski device according to the present invention comprises: a left landing wheel arm provided on the left portion of the bike, a left landing wheel being rotatably coupled to the lower end of the left landing wheel arm such that the left landing wheel can be moved up/down; a right landing wheel arm provided on the right portion of the bike, a right landing wheel being rotatably coupled to the lower end of the right landing wheel arm such that the right landing wheel can be moved up/down; a left driving unit for lifting/lowering the left landing wheel by driving the left landing wheel arm; a right driving unit for lifting/lowering the right landing wheel by driving the right landing wheel arm; a left ski mounting socket coupled to the left landing wheel arm; a right ski mounting socket coupled to the right landing wheel arm; a left insertion member detachably coupled to the left ski mounting socket; a right insertion member detachably coupled to the right ski mounting socket; a left ski leg integrally coupled to the left insertion member so as to extend downwards; a right ski leg integrally coupled to the right insertion member so as to extend downwards; a left bike ski, which is hinge-coupled to the lower end of the left ski leg to be able to make a hinge movement about a left/right horizontal axis, which extends in the forward/backward direction, and which has blades formed on the left and right ends, respectively; and a right bike ski, which is hinge-coupled to the lower end of the right ski leg to be able to make a hinge movement about the left/right horizontal axis, which extends in the forward/backward direction, and which has blades formed on the left and right ends, respectively.

The present invention relates to a bike having an expanded knife ski device. The bike having an expanded knife ski device according to the present invention comprises: a left landing wheel arm provided on the left portion of the bike, a left landing wheel being rotatably coupled to the lower end of the left landing wheel arm such that the left landing wheel can be moved up/down; a right landing wheel arm provided on the right portion of the bike, a right landing wheel being rotatably coupled to the lower end of the right landing wheel arm such that the right landing wheel can be moved up/down; a left driving unit for lifting/lowering the left landing wheel by driving the left landing wheel arm; a right driving unit for lifting/lowering the right landing wheel by driving the right landing wheel arm; a left ski mounting socket coupled to the left landing wheel arm; a right ski mounting socket coupled to the right landing wheel arm; a left insertion member detachably coupled to the left ski mounting socket; a right insertion member detachably coupled to the right ski mounting socket; a left ski leg integrally coupled to the left insertion member so as to extend downwards; a right ski leg integrally coupled to the right insertion member so as to extend downwards; a left bike ski, which is hinge-coupled to the lower end of the left ski leg to be able to make a hinge movement about a left/right horizontal axis, which extends in the forward/backward direction, and which has blades formed on the left and right ends, respectively; and a right bike ski, which is hinge-coupled to the lower end of the right ski leg to be able to make a hinge movement about the left/right horizontal axis, which extends in the forward/backward direction, and which has blades formed on the left and right ends, respectively.

The system can include a vehicle having a vehicle frame and a traction apparatus connected to the vehicle frame for providing traction on a planar surface to move the vehicle relative to the planar surface, the vehicle frame having a seat for supporting a user. The system can also include a support structure including a plurality of runners for contacting the planar surface, the plurality of runners including one or more of the following: skates and skis, and a weight compensation system connecting the vehicle frame to the support structure about a pivot. The weight compensation system is configured to adjust the position of the traction apparatus relative to the support structure in response to weight of a user.