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A technical patent-style illustration of a spherical buoy's sensor module, showing a rope, magnet, reed switch, and internal electronics with numbered callouts.

A technical patent-style illustration of a spherical buoy's sensor module, showing a rope, magnet, reed switch, and internal electronics with numbered callouts.

Technical patent-drawing style illustration, black ink line art on white background with thin blue accent lines for internal detail, mechanical engineering patent style (USPTO style). Subject: a compact sensor module mounted where a mooring pendant rope exits a spherical buoy. Main cross-section view: A lightweight open collar/ring loosely encircling the rope, free to swing, positioned just below where the rope exits the buoy housing. In the rest position, the collar hangs straight down in line with the rope under no load. A dashed alternate position shows the collar and rope swung to one side, labeled "rope under tension — pulled off-vertical." A small magnet is shown embedded in the collar. Below the collar's rest position, a fixed reed switch is mounted to the housing, with a labeled air gap between magnet and switch. Secondary detail: a small sealed enclosure beside the collar mechanism containing a labeled PCB (MCU, LoRa radio), a cylindrical LiFePO4 battery, and an internal antenna behind a dashed "RF-transparent window" section of the housing wall. Numbered callouts with thin leader lines: 1. Rope (to boat pendant), 2. Free-riding collar (no load-bearing), 3. Magnet, 4. Reed switch (fixed), 5. Rest position (unloaded, switch open), 6. Swung position (loaded, switch closed), 7. Sealed electronics housing, 8. PCB — MCU/LoRa, 9. Battery, 10. Internal antenna window. Include a small side inset showing both states side by side: "Unoccupied — collar vertical, switch open" See more