Method for monitoring the drift of an anchored vessel and device for implementing the method
OwnerMartin W. Oettliinventor
Life of this patent
Estimating the term…
Abstract
The drift of a boat which lies at anchor is monitored by a piezoelectrical accelerometer which is fixed to the anchor and will be subjected to sharp accelerations in case the anchor is pulled over the ground. The signals emitted by the accelerometer are transmitted to the boat through a multiple strand conductor which is led to the boat parallel to the anchor chain. The transmitted signals are then compared with a preset threshold value. When this threshold value is exceeded, an alarm is triggered. In order to avoid fouling the anchor chain with the electrical cable the latter is wound on a drum, which always exerts a slight pull on the cable.
Claims25
Method for monitoring the position shifts of a body linked to a vessel which lies at anchor, characterized in that one deposits on the ground a body fitted with at least one accelerometer, this body being tied to the vessel by non-rigid linking means, and in that the acceleration signals emitted by the accelerometer are transmitted to the vessel.
Device for monitoring the position shifts of a body linked to a vessel which lies at anchor, comprising:
- a body adapted to be deposited on the ground beneath the water surface, non-rigid linking means connecting the body to the vessel, at least one piezoelectric pick-off and means for transmitting its output signals at least as far as the water surface, both the pick-off and the transmission means being mounted on or in the body. and a receiver station which repeatedly generates a measuring signal in response to the transmitted signals and is operative to trigger an alarm signal when the measuring indicates that the pick-off output signal exceeds a predetermined threshold value.
Apparatus for monitoring the position shifts of a body linked to a vessel which lies at anchor, comprising:
- a body, adapted to being deposited on the ground, said body being fitted with accelerometer means for producing acceleration signals;
- non-rigid linking means connecting said body to said vessel;
- and
- means for transmitting said acceleration signals to said vessel.
Dependencies are inferred from the claim text.