Patent ID: 8657320

Claim:
A sensor arrangement ( 10 , 10 ′) for a wheelchair wheel, which has a running wheel that includes a hub ( 56 ) and a hand rim ( 58 ), comprising: a first fastening arrangement ( 12 , 12 ′) fastened to the running wheel; a second fastening arrangement ( 14 , 14 ′) fastened to the hand rim ( 58 ); and at least one sensor ( 28 , 28 ′) for detecting a movement of the hand rim fastening arrangement ( 14 , 14 ′) relative to the running wheel fastening arrangement ( 12 , 12 ′), wherein two restoring elements ( 32 a , 32 a ′, 32 b , 32 b ′) are provided, which are situated on the first fastening arrangement ( 12 , 12 ′) and rest against the second fastening arrangement ( 14 , 14 ′) with a prestressing force at least in the zero position, and both restoring elements ( 32 a , 32 a ′, 32 b , 32 b ′) rest against at least one stop ( 38 a , 38 a ′, 38 b , 38 b ′) of the first fastening arrangement ( 12 , 12 ′) in the zero position of the sensor arrangement ( 10 , 10 ′), wherein a first section ( 36 a ) of the first restoring element ( 32 a , 32 a ′) is configured to be lifted away from the stop ( 38 a , 38 a ′, 38 b , 38 b ′) by a first relative movement of the first and second fastening arrangements ( 12 , 12 ′, 14 , 14 ′) and to be moved in opposition to the restoring force of the first restoring element ( 32 a , 32 a ′), and wherein a second section ( 36 b ) of the second restoring element ( 32 b , 32 b ′) is configured to be lifted away from the stop ( 38 a , 38 a , 38 b , 38 b ′) by a second relative movement of the first and second fastening arrangements ( 12 , 12 ′, 14 , 14 ′) and to be moved in opposition to the restoring force of the second restoring element ( 32 b , 32 b ′).