Electronic shut off systems
First Claim
1. An electrical control system for suddenly stopping a propeller in a motor driven watercraft, comprising at least one sensor that detects an object near the propeller and a control circuit that can stop or slow the propeller to less than 10 rpm within one second, wherein the at least one sensor triggers the control circuit upon sensing the object, and the control circuit stops a motor connected to the propeller.
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Accused Products
Abstract
Rapid shaft stop devices and transmissions are described that utilize permanent magnets for coupling and/or braking and are useful for electronic propeller guards and other equipment. In an embodiment, one or more capacitive discharge pulses are used to rapidly stop a shaft. A magnetic transmission is provided having axially oriented magnets on each side of an air space junction that transmit torque across the junction with a torque/speed profile that particularly suits boat propellers. The junction may include a bearing and allows slippage when the propeller resistance exceeds a given value. This slippage acts as a variable gear reduction. One or more electromagnets may be energized and thereby add to or subtract from one or more magnetic fields and provide electronic control of torque and of gear reduction ratio for devices such as watercraft drive systems.
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Citations
31 Claims
- 1. An electrical control system for suddenly stopping a propeller in a motor driven watercraft, comprising at least one sensor that detects an object near the propeller and a control circuit that can stop or slow the propeller to less than 10 rpm within one second, wherein the at least one sensor triggers the control circuit upon sensing the object, and the control circuit stops a motor connected to the propeller.
- 6. An electrical control system for suddenly stopping a propeller in a motor driven watercraft in proximity to an object, comprising at least one sensor, a propeller, a motor connected to the propeller, and a control circuit that can stop or slow the propeller to less than 10 rpm within one second, wherein the sensor triggers the control circuit upon sensing the object.
- 16. An electrical control system for suddenly stopping a propeller in a motor driven watercraft, comprising at least one propeller that is connected to a motor, at least one sensor selected from the group consisting of an infrared sensor, an ultrasonic sensor and a tactile switch sensor, and a control circuit connected to the sensor that pulses into one or more electromagnets upon activation by the sensor, and wherein the one or more electromagnets act to at least slow or disconnect the propeller from the motor upon activation.
- 25. An electrical control system for suddenly stopping a spinning shaft, comprising at least one sensor and a control circuit that comprises a capacitor stored charge of electricity that is pulsed into one or more electromagnets upon activation by the at least one sensor, the at least one sensor comprises at least one infrared sensor or ultrasonic sensor and wherein the one or more electromagnets act to at least slow or disconnect the shaft from a motor upon activation.
Specification