Classifications

• • G—PHYSICS
  • G08—SIGNALLING
  • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
  • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
  • G08B21/18—Status alarms
  • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P13/00—Indicating or recording presence, absence, or direction, of movement
  • G01P13/02—Indicating direction only, e.g. by weather vane

Definitions

• the present invention relates to an anchoring alarm, especially for leisure boats.
• an anchor is usually designed so that the force with which the anchor can be loaded with ⁇ ut losing its hold is greatest in one specific direction and therefore when anchoring the aim is to make this direction coincide with the wind direction. Assuming that the anchor has sufficient holding strength and the wind conditions remain constant, it is not disadvantageous to let the boat ride at anchor.
• the object of the present invention is to provide an anchoring alarm, especially for leisure boats, by means of which, when wind conditions change to the extent that there is a danger that the boat will break loose from its mooring and start to drift, an alarm signal is produced to warn in good time that re-anchoring may be necessary.
• the anchoring alarm comprises a first device for monitoring the wind speed and for producing a first signal when the wind speed exceeds a predetermined value, a second device for monitoring the value of the angle between the lengthways direction of the boat and a reference direction, this angle being set equal to nil at the time of anchoring, and for producing a second signal when the angle value exceeds a predetermined value as a result of a change in wind direction, and an alarm arrangement connected signalwise with the said devices and designed to produce a noise and/or light signal when the said first and second signals occur simultaneously.
• Figures 1a and 1b show schematically an embodiment of the invention with the wind conditions generally unchanged from those prevailing at the time of anchoring ( Figure 1a) and with the wind conditions changed so much that the boat should be anchored afresh.
• Figure 2 An alternative embodiment of the invention is shown schematically in Figure 2.
• An anchoring alarm comprises a first device 1 for producing a first signal when the wind speed and thus also the wind pressure exceed a predetermined value, a second device 2 designed to produce a second signal when the wind shifts through an angle which exceeds a certain angular value, and an alarm arrangement 5 connected signalwise with the said devices 1, 2 via lines 3, 4, with the task of producing a noise and/or light signal when the said first and second signals occur simultaneously.
• the first device 1 may consist of a conventional wind pressure gauge 6 with a chamber 7 open to the front and a piston 8 which is movable therein, and an optical monitoring device 9 with a light source, such as a photodiode, and a photocell 9b.
• the piston 8 At low wind pressure values the piston 8 is located well back in the chamber 7 and a plate 10 effectively connected to the piston interrupts the path of the beam between the light source 9a and the photocell 9b, the output signal then being equal to nil. With increasing wind pressure the piston 8 is forced outwards towards the opening of the chamber and at a certain wind pressure level the path of the beam is no longer interrupted by the plate 10, so that as a result an output signal equal to the above-mentioned first signal is obtained by the photocell 9b. This is transmitted via the line 3 to the alarm arrangement 5.
• the second device 2 comprises a rotatably mounted sector-shaped plate 11 which is effectively connected to a compass needle 12 indicated on the drawing by an arrow, and an. optical monitoring device 13 of the same kind as the monitoring device 9, i.e. comprising a light source and a photocell the latter being' connected via the line 4 to the alarm arrangement 5.
• the sector-shaped plate has a sector angle 14 within which it interrupts the path of the beam between the light source and the photocell. Within the remainder of the sectorshaped plate 11 the said beam path is not interrupted but, as before, an output signal equal to the second signal is produced here.
• the sector angle 14 is equal to double the wind shift angle which the anchor can tolerate without losing hold.
• the monitoring device 13 is rotated into a position wherein it divides the sector angle 14 in half.
• the compass needle 12 holds the sectorshaped plate 11 in a position which varies only dependent upon the movements of the boat swinging round in the direction of the wind (see Figure 1a). If the wind direction now changes by more than half the sector angle 14 (see Figure lb) then, as a result of the boat striving to lie with the wind direction, the sector-shaped plate 11 no longer interrupts the path of the beam and the second signal is obtained as described above.
• the alarm arrangement 5 is designed to produce a noise and/or light signal when the signals arrive simultaneously via the lines 3 and 4.
• the noise signal can be transmitted over a loud-speaker 15 positioned at a suitable point on the boat, as shown on the drawing.
• the invention may be constructed in many ways within the framework of the concept of the invention.
• the first device 1 may consist of a conventional wind gauge 6 combined with a signal level monitoring circuit, a so-called level balancer circuit, expediently positioned in the alarm arrangement 5.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
• Emergency Alarm Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20351337

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (3)

• 1983
  • 1983-05-26 SE SE8302968A patent/SE432315B/sv unknown
• 1984
  • 1984-05-28 WO PCT/SE1984/000203 patent/WO1984004836A1/en unknown
  • 1984-05-28 AU AU30171/84A patent/AU3017184A/en not_active Abandoned
  • 1984-05-28 EP EP19840902239 patent/EP0179060A1/de not_active Withdrawn

Non-Patent Citations (1)

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