Abstract: The invention relates to a removable bolt assembly for fastening a toilet seat to a commode using a knob or bar handle. The knob or bar handle, pivotally mounted to the bolt, can be used to twist or clamp the bolt into engagement with a nut that is inserted through a hole in the toilet. The hole in the toilet can be circular or noncircular. Where the hole is noncircular, the nut has a corresponding noncircular geometric neck so as to prevent it from rotating in the hole. Where the hole is circular, a fastening hinge having a connecting insert can be used to prevent rotation of the nut when it is engaged with the connecting insert. In this way the bolt is directly interlocked with the nut without the use of any tool, thereby making it easy to lock and fasten the seat to the commode.

Abstract: A bicycle seat assembly includes a seat frame, a back cushion and a seat member. The back cushion is mounted on an upwardly inclining section of the seat frame, and forms an obtuse angle with a horizontal plane. The seat member is mounted on a horizontally extending section of the seat frame, and has a top seating surface formed with a buttocks-receiving recess.

Abstract: A bicycle frame includes a top tube which has a first mounting seat and a second mounting seat spaced apart from the first mounting seat in a longitudinal direction of the top tube, and a seat tube which has first upper and lower ends. The first lower end is pivotally mounted to the first mounting seat. An extension tube is connected to the first upper end for mounting a seat thereon. A telescopic bracket tube is pivotally mounted to the second mounting seat and the first upper end, and is extendable and retractable so as to adjust the position of the seat tube. A plurality of locking members lock the telescopic bracket tube against extension and retraction so as to position the seat tube.