A band device according to an aspect of the present disclosure includes a sensor unit, and a band unit that is linked to the sensor unit and forms a hollow part together with the sensor unit. The band unit includes an end piece section to which a watch head section is attached, and an engaging section that makes detachable engagement in a state where the band unit is wrapped around a wrist.

A buckle includes a folding member, a buckle cover pivotably linked to the folding member, a slide plate supported slidably relative to the buckle cover in the longitudinal direction of the band, and a swing arm rotatably supported by the buckle cover. The slide plate has a plurality of groove sections provided along the longitudinal direction. The swing arm includes a base, an arm section, an engagement click, and an operation strip, and is supported rotatably in a first rotational direction in which the engagement click engages with any of the groove sections and in a second rotational direction in which the engagement click separates from the groove section. The folding member includes a protruding section that comes into contact with the operation strip to rotate the swing arm in the second rotational direction when the folding member is rotated relative to the buckle cover.

A buckle includes a folding member linked to a band, a slide plate having a plurality of groove sections provided along the longitudinal direction of the band, a swing arm including an engagement click engageable with any of the groove sections, and a spring that urges the swing arm in a first rotational direction, and the folding member restricts rotation of the swing arm in the second rotational direction when the folding member is accommodated in the buckle cover, and cancels the restriction of the rotation of the swing arm in the second rotational direction when the folding member is detached from the buckle cover.

A wearable device configured to monitor physiological parameters of a wearer can include: a physiological parameter measurement sensor configured to monitor a plurality of physiological parameters; a hardware processor; a display in communication with the processor; and a band configured to secure the physiological parameter measurement sensor on a wrist of the wearer. In some implementations, the hardware processor is configured to: obtain a first plurality of signals from the physiological parameter measurement sensor when the band is secured on the wrist at a first tightness; determine a signal quality responsive to the first plurality of signals; and output an indication on the display to adjust tightness of the band with respect to the wrist from the first tightness to a second tightness based on the determined signal quality.

A device for adjusting the length of a wristlet includes: a cover (10); a link element (40) designed to be connected to a wristlet strand (9) and mounted movable relative to the cover (10) in the longitudinal direction in which extends a wristlet strand to be connected to the adjusting link element, such that this displacement of the adjusting link element (40) relative to the cover (10) enables lengthening or shortening the length of a wristlet strand; an actuating device (30) arranged on the cover (10) movable relative to the cover in at least the longitudinal direction; and a kinematic connection connecting the actuating device (30) and the adjusting link element (40), such that the actuation of the actuating device (30) in at least the longitudinal direction relative to the cover (10) can bring about the longitudinal displacement of the adjusting link element (40) relative to the cover (10).

A device for finely adjusting the length of a bracelet inserted between two elements of the bracelet and includes an outer part attached to one, an inner part attached to the other and to slide in the outer part parallel to the longitudinal direction of the bracelet, causing the length of the bracelet to be varied, and a stop arranged to limit the travel of the inner part relative to the outer part so the bracelet cannot be extended beyond a maximum length. The outer part includes a wall having an immobilization hole on its inner side. The inner part includes a pivoting lever with a first end biased by a spring toward the outer part wall, permitting the first end to engage the immobilization hole, immobilizing the inner part relative to the outer part. The inner part has a control member permitting manual control of the lever.

A wristlet clasp (100), of the folding buckle type, including first and second hinged blades (1, 2) between a closed wearing position and at least one open position, the first blade carrying a member for fastening a first wristlet strand, the second lower blade being connected to a loop (3) at its second end, the loop defining a passage for a second wristlet strand and carrying a stud (31) intended to be inserted into an adapted hole in the wristlet strand to define a point for anchoring the latter to the clasp. A locking member (12) holds the first and second blades in their closed position. A carriage (4) is connected to the second end of the second blade and slides in the loop switching from first and second indexed positions to define at least two predefined positions associated with a predefined useful length of the wristlet.

A wristlet clasp (100), of the folding buckle type, including first and second blades (1, 2) hinged relative to each other, the first blade (1) further including locking means for holding the first and second blades (1, 2) in their closed position at its second end, and the second blade (2) carrying a member for fastening a first wristlet strand at its second end. The first and second blades are hinged together by movable blades (3, 4) by a first of their respective ends, the hinged blades being connected to the first and second blades via a first hinge (A1) and a second hinge (A2), the hinge (A1, A2) being angularly delimited by stops respectively formed on the first end of the first and second blades and on the second end of the movable blades so as to define two predefined wearing positions depending on the size of the wrist.

A folding clasp for a wrist watch comprising a first bracket (3) and a second bracket (4), wherein the first bracket (3) has a first securing mechanism (6) for securing a wristband or a watch housing of the wrist watch, wherein the second bracket (4) has a second securing mechanism (7) for securing the wristband (2) of the wrist watch, wherein the first bracket (3) and the second bracket (4) are moveably connected to one another, such that the first and the second brackets (3, 4) can be moved relative to one another between an open state and a closed state of the folding clasp (1), wherein the folding clasp has a locking mechanism (9) in order to retain the first and the second brackets (3, 4) in the closed state, wherein the second securing mechanism (7) has a protruding pin (74) which is designed to be guided through the wristband (2) in order to secure the wristband in various axial positions in the second securing mechanism (7), wherein the second securing mechanism (7) has a blocking means (8) which is designed to retain the distal end of the pin (74) guided through the wristband (2) such that the wristband is blocked on the pin (74) in the open state of the folding clasp (1).

A biological information measuring device includes: a case unit; a first band that is a member connected to a first end portion of the case unit; and a second band that is a member connected to a second end portion of the case unit at the side opposite to the first end portion. When a direction from the first band toward the second band is Y axis, a direction orthogonal to the Y axis in a plan view seen from a thickness direction of the case unit is X axis, and when a width of the first end portion in the X axis direction is a and a width of the second end portion in the X axis direction is b, the case unit satisfies a relation a<b.