Abstract: A flexible tube includes a first connecting portion and a second connecting section. The second connecting section and the first connecting section are integrally connected to each other. The first connecting section has a first end surface, and the second connecting section has a second end surface, wherein there is an acute angle between the first end surface and the second end surface.

Abstract: A differential-velocity driving device and a mechanical arm to which the differential-velocity driving device is applied are provided. The differential-velocity driving device includes a first rotary driving element, a first transmission gear connected to the first rotary driving element, a second rotary driving element, a second transmission gear connected to the second rotary driving element, a fixing member connected to the first rotary driving element and the second rotary driving element such that the first rotary driving element does not move or rotate with respect to the second rotary driving element, a power output gear engaged with the first transmission gear and the second transmission gear, and an output shaft passing through an axle center of the power output gear and being coaxial with the axle center.

Abstract: A joint device includes a rotary shaft, two fixing members, two driving members, two transmission gears, and a link gear. The two driving members are respectively fixed to the two fixing members, and the two fixing members are pivoted to each other through the rotary shaft. The two driving members are respectively connected to and drive the two transmission gears. The link gear is pivoted to the rotary shaft and engaged with the two transmission gears respectively, so that the two driving members are in a transmission relation. The joint device adopts the combination of dual driving members and gear sets, thereby achieving the high reactivity and high load function.

Abstract: A joint device includes a rotary shaft, two fixing members, two driving members, two transmission gears, and a link gear. The two driving members are respectively fixed to the two fixing members, and the two fixing members are pivoted to each other through the rotary shaft. The two driving members are respectively connected to and drive the two transmission gears. The link gear is pivoted to the rotary shaft and engaged with the two transmission gears respectively, so that the two driving members are in a transmission relation. The joint device adopts the combination of dual driving members and gear sets, thereby achieving the high reactivity and high load function.

Abstract: A puddle eliminating system and a puddle eliminating method are provided. The puddle eliminating system includes a main body, a moving wheel set, a water absorbing unit, at least one water sensor, a water-storage tank and a fan unit. The main body has a control unit, which the moving wheel set disposed at the bottom of the main body and the fan unit are electrically connected to. The water absorbing unit having the water sensor therein and being electrically connected to the control unit is disposed at the main body. The water-storage tank communicates with the water absorbing unit. The moving wheel set shifts and the absorbing unit absorbs and transmits puddle to the water-storage tank. The water sensor detects in a predetermined period whether there is puddle in an environment whereat the puddle eliminating system is placed or not and transmits detecting signals to the control unit.