A band clasp comprises a ratchet assembly at a first end of a band, the ratchet assembly including a plate having a rim that defines an aperture that extends along a length of the first end, the ratchet assembly further including a track that extends along the length of the first end beneath the pla
A band clasp comprises a ratchet assembly at a first end of a band, the ratchet assembly including a plate having a rim that defines an aperture that extends along a length of the first end, the ratchet assembly further including a track that extends along the length of the first end beneath the plate, the track having a first side and a second side, the first side including a first plurality of teeth opposing a second plurality of teeth of the second side. The band clasp further comprises a pawl assembly disposed at a second end of the band opposite the first end, the pawl assembly including opposing pawls having an outward bias, the opposing pawls configured to engage the rim and opposing teeth of the track through the aperture to fasten the first end of the band to the second end of the band.
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1. A band clasp, comprising: a ratchet assembly at a first end of a band, the ratchet assembly including a plate having a rim that defines an aperture that extends along a length of the first end, the ratchet assembly further including a track that extends along the length of the first end beneath t
1. A band clasp, comprising: a ratchet assembly at a first end of a band, the ratchet assembly including a plate having a rim that defines an aperture that extends along a length of the first end, the ratchet assembly further including a track that extends along the length of the first end beneath the plate, the track having a first side and a second side, the first side including a first plurality of teeth opposing a second plurality of teeth of the second side; anda pawl assembly disposed at a second end of the band opposite the first end, the pawl assembly including opposing pawls having an outward bias, the opposing pawls configured to engage the rim and opposing teeth of the track through the aperture to fasten the first end of the band to the second end of the band. 2. The band clasp of claim 1, where the opposing pawls extend substantially perpendicularly from the second end of the band. 3. The band clasp of claim 1, where each opposing pawl includes a tapered head that automatically inwardly deflects that opposing pawl in response to the tapered head extending through the aperture. 4. The band clasp of claim 1, where each opposing pawl includes a catch that engages the plate and resists that opposing pawl from being removed through the aperture. 5. The band clasp of claim 4, further comprising a pawl release that moves a respective opposing pawl inward so as to disengage the catch of the respective opposing pawl from the plate and allow the respective opposing pawl to be removed through the aperture. 6. The band clasp of claim 4, where each tooth of the track includes a ramp portion that automatically inwardly deflects an opposing pawl in response to an effective length of the band being shortened. 7. The band clasp of claim 6, where the catch remains engaged with the plate as the ramp portion automatically inwardly deflects the opposing pawl. 8. The band clasp of claim 1, where each tooth of the track includes a stop that engages an opposing pawl to resist an effective length of the band from being lengthened. 9. The band clasp of claim 8, further comprising a pawl release that moves the opposing pawl inward so as to disengage the opposing pawl from the stop and allow the effective length of the band to be lengthened. 10. A wearable device, comprising: a display carrier module;a band operatively attached to the display carrier module; anda band clasp operatively attached to the band, the band clasp including: a ratchet assembly at a first end of the band, the ratchet assembly including a plate having a rim that defines an aperture that extends along a length of the first end, the ratchet assembly further including a track that extends along the length of the first end beneath the plate, the track having a first side and a second side, the first side including a first plurality of teeth opposing a second plurality of teeth of the second side; anda pawl assembly disposed at a second end of the band opposite the first end, the pawl assembly including opposing pawls having an outward bias, the opposing pawls configured to engage the rim and opposing teeth of the track through the aperture to fasten the first end of the band to the second end of the band. 11. The wearable device of claim 10, wherein the display carrier module is configured to provide an indication of time. 12. The wearable device of claim 10, wherein the display carrier module includes a computing device. 13. The wearable device of claim 10, wherein the display carrier module includes a fitness tracking computing device. 14. The wearable device of claim 10, further comprising a heart rate sensor. 15. The wearable device of claim 14, wherein the aperture is positioned along an outward face of the first end of the band, and wherein the heart rate sensor is positioned along an inward face of the first end of the band, the inward face opposing the outward face with the first end of the band fastened to the second end of the band. 16. The wearable device of claim 10, wherein the ratchet assembly is in opposing abutment with the pawl assembly with the first end of the band fastened to the second end of the band. 17. A wearable sensor system, comprising: a display carrier module;a band operatively attached to the display carrier module, the band including a heart rate sensor positioned at a first end of the band; anda band clasp operatively attached to the band, the band clasp including: a ratchet assembly at the first end of the band, the ratchet assembly including a plate having a rim that defines an aperture that extends along a length of the first end, the ratchet assembly further including a track that extends along the length of the first end beneath the plate, the track having a first side and a second side, the first side including a first plurality of teeth opposing a second plurality of teeth of the second side; anda pawl assembly disposed at a second end of the band opposite the first end, the pawl assembly including opposing pawls having an outward bias, the opposing pawls configured to engage the rim and opposing teeth of the track through the aperture to fasten the first end of the band to the second end of the band. 18. The wearable sensor system of claim 17, wherein the display carrier module is configured to provide output indicative of measurement performed by the heart rate sensor. 19. The wearable sensor system of claim 18, wherein the heart rate sensor is positioned along an inward face of the first end of the band, and wherein the track is positioned along an outward face of the first end of the band, the outward face opposing the inward face and the pawl assembly with the first end fastened to the second end. 20. The wearable sensor system of claim 17, wherein the ratchet assembly is in opposing abutment with the pawl assembly with the first end fastened to the second end.
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