A securing strap assembly includes a horizontal strap configured to wrap around a vertical standpipe. A pivoting strap is pivotally attached to the horizontal strap and is configured to extend over a pipe elbow inserted into the vertical standpipe. The pivoting strap has a first leg having a first connected end pivotally connected to the horizontal strap and a first adjusting end, a second leg having a second connected end pivotally connected to the horizontal strap and a second adjusting end, and a first adjustment mechanism configured to draw the first adjusting end and the second adjusting end to each other.

An adjustable tightening device is provided, including: a fastening, an actuating member and a rotatable member. Wherein when the rotatable member is rotated toward a first direction, each abutting rib of the rotatable member is located in the third position, each of the two abutting ribs abuts against one of two elastic arms of the actuating member so that a ratchet is not meshed with an annular gearing portion of the fastening mechanism and a gear portion of the actuating member is rotatable toward the first direction; wherein when the rotatable member is rotated toward a second direction, each of the two abutting ribs is located in the fourth position, each of the two abutting ribs abuts against one of the two elastic arms so that the ratchet is meshed with the annular gearing portion and the gear portion is unidirectionally rotatable toward the second direction.

A lacing system configured to selectively adjust the size of an opening on an object and allow for the incremental release of the lace within the lacing system. The lacing system can have a reel comprising a housing, a spool supported by the housing, and a knob supported by the housing. The reel can be configured so that cable is gathered in the channel formed in the spool when the spool is rotated in a first direction relative to the housing, and so that cable can be incrementally released from the spool when the spool is rotated in a second direction relative to the housing. In some embodiments, the reel can include a rotation limiter which can be configured to prevent over-tightening of the lacing system and/or to prevent rotation past the substantially fully loosened state.

A head-mounted resilient auxiliary locking mechanism and a head-mounted display, wherein the mechanism comprises a connecting band (3), a rear housing (1) provided at a rear of the connecting band (3), a locking module (4) provided in the rear housing (1), racks (2) provided at the two ends of the connecting band (3) and inserted into the rear housing (1) to engage with the locking module (4), and a resilient band (7) connected between the connecting band (3) and the rear housing (1); when the locking module (4) locks the racks (2), the resilient band (7) prevents the engaging between the racks (2) and the locking module (4) from loosing; and when the locking module (4) releases the racks (2), the resilient band (7) drives the racks (2) to return. The head-mounted display comprises a display (8) and the head-mounted resilient auxiliary locking mechanism.

The disclosed strap adjustment devices may include a pinion gear, with a first rack secured to a first strap and a second rack secured to a second strap each engaged with the pinion gear. A rotatable cam element may include an angled radially outer surface that is at an angle to a circumference of the rotatable cam element. A bearing element may be positioned adjacent to the angled radially outer surface such that the bearing element jams between the angled radially outer surface and a braking surface when the rotatable cam element is rotated in a jamming direction. A spiral spring may be coupled to the pinion gear and the rotatable cam element to allow for an increase in length of the first and second straps upon application of a tension force to the first and second straps. Various other methods, systems, and devices are also disclosed.

An adjusting mechanism and a head mounted display are provided. The adjusting mechanism includes a band, a rotating shaft, a knob, a driving member, and a holder. The rotating shaft has a first ring tooth around a central axis. The band is driven by the rotating shaft to move relative to the rotating shaft when the rotating shaft rotates around the central axis. The knob has a plurality of chutes. Each chute has a first section and a second section. The depth of each first section is deeper than the depth of each second section. The driving member has a second ring tooth, a plurality of guiding pins, and a plurality of pawls. The driving member is assembled to the knob, and the guiding pins are located in the chutes. The holder has a circular unidirectional tooth. The band limits the rotation of the holder relative to the band. The circular unidirectional tooth is configured to be coupled with these pawls to limit the rotation of the driving member relative to the holder in a single direction.

A lacing system configured to selectively adjust the size of an opening on an object and allow for the incremental release of the lace within the lacing system. The lacing system can have a reel comprising a housing, a spool supported by the housing, and a knob supported by the housing. The reel can be configured so that cable is gathered in the channel formed in the spool when the spool is rotated in a first direction relative to the housing, and so that cable can be incrementally released from the spool when the spool is rotated in a second direction relative to the housing. In some embodiments, the reel can include a rotation limiter which can be configured to prevent over-tightening of the lacing system and/or to prevent rotation past the substantially fully loosened state.

An adjusting mechanism and a head mounted display are provided. The adjusting mechanism includes a band, a rotating shaft, a knob, a driving member, and a holder. The rotating shaft has a first ring tooth around a central axis. The band is driven by the rotating shaft to move relative to the rotating shaft when the rotating shaft rotates around the central axis. The knob has a plurality of chutes. Each chute has a first section and a second section. The depth of each first section is deeper than the depth of each second section. The driving member has a second ring tooth, a plurality of guiding pins, and a plurality of pawls. The driving member is assembled to the knob, and the guiding pins are located in the chutes. The holder has a circular unidirectional tooth. The band limits the rotation of the holder relative to the band. The circular unidirectional tooth is configured to be coupled with these pawls to limit the rotation of the driving member relative to the holder in a single direction.

A head-mounted resilient auxiliary locking mechanism and a head-mounted display, wherein the mechanism comprises a connecting band (3), a rear housing (1) provided at a rear of the connecting band (3), a locking module (4) provided in the rear housing (1), racks (2) provided at the two ends of the connecting band (3) and inserted into the rear housing (1) to engage with the locking module (4), and a resilient band (7) connected between the connecting band (3) and the rear housing (1); when the locking module (4) locks the racks (2), the resilient band (7) prevents the engaging between the racks (2) and the locking module (4) from loosing; and when the locking module (4) releases the racks (2), the resilient band (7) drives the racks (2) to return. The head-mounted display comprises a display (8) and the head-mounted resilient auxiliary locking mechanism.

A size adjustment arrangement for a garment comprises a base member, a ratchet member, a line, a spool, and an actuator. The line is wound on the spool with the line extending through at least one channel in the garment. The actuator is selectively rotatable in a first direction and a second direction without activation of any release mechanism. When a first force is applied to rotate the actuator in the first direction, the line is wound upon the spool. When a second force is applied to rotate the actuator in the second direction, the line is unwound upon the spool. The ratchet member and the spool are blocked from rotation when neither the first force nor the second force is applied to the actuator.