Patent ID: 9549861
Date: 2017-01-24
CPC Classifications: A61G,G05D,G08B

Claim:
1. An early warning device determining whether a ground around a backside of a wheelchair is a barrier terrain for preventing the wheelchair from a backside tipping over, which wheelchair has a back on which a bag used for holding the early warning device is disposed, comprising: a quick-release attaching piece having a containing space and configured to detachably clip to the bag; a laser light generator projecting a laser light pattern onto the ground; an image sensor scanning the laser light pattern; and a smart phone requiring an applet installed therein to perform an early warning function for comparing the laser light pattern with a standard pattern to determine whether the ground is the barrier terrain such that the early warning device generates an early warning being one selected from the group consisting of a beep, a warning message and a vibration to prevent the wheelchair from entering the barrier terrain, wherein the laser light generator is electrically connected to the smart phone, the image sensor is a component disposed inside the smart phone, the laser light generator and the smart phone are integratedly disposed in the containing space on the quick-release attaching piece to form the early warning device, and the early warning device is detachably mounted in the bag on the wheelchair through the quick-release attaching piece.