Abstract: A door unlocking and/or door opening mechanism may have an actuating device that may have at least one actuating element, a housing, and at least one detection unit. The detection unit may have a sensor, a trigger element and an evaluation unit. The detection unit may be arranged in the housing. The actuating element may be arranged for an actuation outside the housing and in a region that is accessible from the outside. The trigger element may be arranged at a distance from the sensor in a locked state of the door unlocking and/or door opening mechanism. When the actuating element is actuated in the direction of the housing, to the actuating element deforms the trigger element. The sensor detects a change in the distance between the trigger element and the sensor.

Abstract: Surfing and water toys, apparatus, devices and methods for interchanging upwardly protruding objects on the toy and attaching and detaching hydrofoil underneath comprising a skeg and wings/vanes. Apparatus, devices and methods, for converting the toys to non-surfing and non-water uses which include skateboards, sleds and snowboards. Apparatus, devices and methods for providing carve sticks to guide the toys.

Abstract: Surfing and water toys, apparatus, devices and methods for interchanging upwardly protruding objects on the toy and attaching and detaching hydrofoil underneath comprising a skeg and wings/vanes. Apparatus, devices and methods, for converting the toys to non-surfing and non-water uses which include skateboards, sleds and snowboards. Apparatus, devices and methods for providing carve sticks to guide the toys.

Abstract: A folding wheelchair includes two side frames, which are connected to each other via a cross-strut. A fabric is stretched between the side frames in order to form a seating area of a seat. The side frames are formed identically and include an outer tube and an inner tube. The outer tubes have a slot extending in a longitudinal direction (L), which opens at least into an outer tube end. The inner tubes each include a slot extending in the longitudinal direction (L), which opens at least into an inner tube end. A tensioning rod is accommodated in one of the outer tubes and opens into the associated inner tube. The fabric is led to the outside through the slots of the inner tube and outer tube. The inner tube, the fabric and the tensioning rod are connected to one another.