Safety high speed electric toy vehicle
First Claim
1. A toy vehicle having an electric motor with a rotary shaft for driving said vehicle, comprising a motion tag, a motion sensor and a motion detection device, whereinsaid motion tag comprises a permanent magnet attached to a gear disc of a transmission system of said vehicle and is movable in response to rotation of said rotary shaft,said motion sensor comprises a plurality of coils adapted for non-contact detection of motion of said motion tag and generates a characteristic electrical signal output in response to movement of said motion tag, andsaid motion detection device accepts and processes said characteristic electrical signal output from said motion sensor and is adapted to trigger cut-off of power supply to said electric motor when said characteristic output signal indicates that there has been no relative motion between the motion tag and the motion sensor for a predetermined duration.
2 Assignments
0 Petitions
Accused Products
Abstract
A high speed electric toy vehicle having a high current rating electric motor is provided with a fail-safe mechanism which would promptly operate to cut off motor power supply before the battery is burnt or the vehicle housing is melted as a result of over-current developed across an electric motor due to locking of rotary shaft under operating conditions. The fail-safe mechanism operates by detecting the presence or absence of motor motion as indicated by a motion tag which are attached to a part of the vehicle which always moves in response to movement of the motor shaft. The mechanism will cut off supply to the motor when no motion has been detected for a pre-determined time period.
20 Citations
8 Claims
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1. A toy vehicle having an electric motor with a rotary shaft for driving said vehicle, comprising a motion tag, a motion sensor and a motion detection device, wherein
said motion tag comprises a permanent magnet attached to a gear disc of a transmission system of said vehicle and is movable in response to rotation of said rotary shaft, said motion sensor comprises a plurality of coils adapted for non-contact detection of motion of said motion tag and generates a characteristic electrical signal output in response to movement of said motion tag, and said motion detection device accepts and processes said characteristic electrical signal output from said motion sensor and is adapted to trigger cut-off of power supply to said electric motor when said characteristic output signal indicates that there has been no relative motion between the motion tag and the motion sensor for a predetermined duration.
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4. A toy vehicle having an electric motor with a rotary shaft for driving said vehicle, comprising a motion tag, a motion sensor and a motion detection device, wherein
said motion tag is an aperture formed on a gear disc of a transmission system of said vehicle and is movable in response to rotation of said rotary shaft, said motion sensor comprises an optical source and an optical detector adapted for non-contact detection of motion of said motion tag and generates a characteristic electrical signal output in response to movement of said motion tag, and said motion detection device accepts and processes said characteristic electrical signal output from said motion sensor and is adapted to trigger cut-off of power supply to said electric motor when said characteristic output signal indicates that there has been no relative motion between the motion tag and the motion sensor for a predetermined duration.
Specification