Abstract: A reciprocating mechanism includes a first connecting element, a crankshaft and a second connecting element. The crankshaft includes a rotation shaft, a first following element and a second following element. The first following element is pivotally disposed on one side of the rotation shaft and movably coupled to the first connecting element. The second following element is pivotally disposed on the other side of the rotation shaft, and a first angle is formed between the first following element and the second following element. The second connecting element is movably coupled to the second following element. The first following element and the second following element are configured to rotate around the rotation shaft so as to be movably coupled to and cause each of the first connecting element and the second connecting element to reciprocate and cyclically pivot along an arc-shaped trajectory.

Abstract: A reciprocating mechanism includes a first connecting element, a crankshaft and a second connecting element. The crankshaft includes a rotation shaft, a first following element and a second following element. The first following element is pivotally disposed on one side of the rotation shaft and movably coupled to the first connecting element. The second following element is pivotally disposed on the other side of the rotation shaft, and a first angle is formed between the first following element and the second following element. The second connecting element is movably coupled to the second following element. The first following element and the second following element are configured to rotate around the rotation shaft so as to be movably coupled to and cause each of the first connecting element and the second connecting element to reciprocate and cyclically pivot along an arc-shaped trajectory.

Abstract: A saddle device includes a first seat unit having a front mounting portion and a rear mounting end portion, a saddle unit having a front end edge unit and a top surface unit, and an elongate backrest including two spaced-apart long sides, and two spaced-apart short sides that are connected between the long sides, and removably mounted to a selected one of the front mounting portion and the rear mounting portion such that, when the backrest is mounted to the front mounting portion, at least one of the short sides is located in front of the front end edge unit, and when the backrest is mounted to the rear mounting end portion, at least one of the long sides is located above the top surface unit.

Abstract: A saddle device includes a first seat unit having a front mounting portion and a rear mounting end portion, a saddle unit having a front end edge unit and a top surface unit, and an elongate backrest including two spaced-apart long sides, and two spaced-apart short sides that are connected between the long sides, and removably mounted to a selected one of the front mounting portion and the rear mounting portion such that, when the backrest is mounted to the front mounting portion, at least one of the short sides is located in front of the front end edge unit, and when the backrest is mounted to the rear mounting end portion, at least one of the long sides is located above the top surface unit.

Abstract: A saddle device includes a first seat unit, a second seat unit mounted to and disposed behind the first seat unit, a saddle unit mounted to the second seat unit, and having a top surface unit, and a supporting member connected to the first seat unit, disposed behind the second seat unit, having a rear mounting end portion that is distal from the first seat unit, and trans formable between a lifted position and a lowered position such that, when the supporting member is at the lifted position, the rear mounting end portion is located above the top surface unit of the saddle unit, and when the supporting member is at the lowered position, the rear mounting end portion is located below the top surface unit of the saddle unit.

Abstract: A saddle device includes a first seat unit, a second seat unit mounted to and disposed behind the first seat unit, a saddle unit mounted to the second seat unit, and having a top surface unit, and a supporting member connected to the first seat unit, disposed behind the second seat unit, having a rear mounting end portion that is distal from the first seat unit, and transformable between a lifted position and a lowered position such that, when the supporting member is at the lifted position, the rear mounting end portion is located above the top surface unit of the saddle unit, and when the supporting member is at the lowered position, the rear mounting end portion is located below the top surface unit of the saddle unit.