Patent ID: 7950498

Claim:
A stair climbing aid being assembled to stairs, comprising: two slide rails assembled to both sides of the stairs, each slide rail defined with a slide groove and provided with a plurality of positioning portions; an assist member, both ends of which are slidably received in the slide grooves of the slide rails respectively; a control mechanism disposed on the assist member; and two positioning assemblies connected to the control mechanism and disposed at both sides of the assist member respectively, each positioning assembly is provided with a spring, a connecting portion and an engaging portion, the spring is biased between the connecting portion and the engaging portion, the engaging portion is pushed by the spring to protrude out of one side of the assist member and connected to the control mechanism by a connecting member, the engaging portions of the positioning assemblies respectively cooperate with the positioning portions of the slide rails; wherein a plurality of induction members, each disposed on a respective said slide rail, are respectively fixed adjacent to each positioning portion, and the control mechanism comprises a first and second control circuit, a first and second button, a first and second electro-magnet and a first and second sensor, wherein the first- -circuit, -button, -electro-magnet, and -sensor are symmetrically disposed with respect to the second- -circuit, -button, -electro-magnet and -sensor on each side of the assist member respectively, the buttons are connected to the control circuits respectively, each one of the electro-magnets is inserted with a respective driving rod, the sensors cooperate with the induction members of the slide rails to carry out a sensing operation, the control circuits are connected to a power source and each control circuit is electrically connected to its corresponding electro-magnet and sensor, and the driving rods are respectively connected to the positioning assemblies.