Pass-through ratcheting mechanism
The disclosed adjustable strap apparatus may include a left strap having a first rack member and a right strap having a second rack member. An electrical unit may have an opening through which a shaft passes. A pinion member may be affixed to a proximal end of the shaft and may be adapted to (a) engage the first rack member and the second rack member and (b) translate the first rack member and the second rack member in opposite directions via rotation of the shaft. A ratcheting member may be coupled to a distal end of the shaft and may include one or more pawls adapted to prevent rotation of the shaft when engaged. Various other methods, systems, and devices are also disclosed.
1. An adjustable strap apparatus comprising:
a left strap comprising a first rack member;
a right strap comprising a second rack member;
a pinion member coupled to a proximal end of a shaft, the pinion member being adapted to:
engage the first rack member and the second rack member; and
translate the first rack member and the second rack member in opposite directions via rotation of the shaft;
a strap housing adapted to substantially prevent translational movement of the pinion member elative to the strap housing and maintain engagement of the pinion member with the first rack member and the second rack member;
a battery assembly having an opening sized to allow the shalt but not the pinion member to pass through; and
a pre-assembled housing assembly that, together with the strap housing, fully contains the battery assembly, the pre-assembled housing assembly comprising:
a ratcheting member coupled to a distal end of the shaft, the ratcheting member comprising one or more pawls;
a monolithic rear housing comprising:
an integral internal gear adapted to engage the one or more pawls, the one or more pawls preventing rotation of the shaft when engaged with the integral internal gear; and
an integral external recess,
a knob coupled to the ratcheting member and comprising an internal recess, wherein:
the knob is positioned within the integral external recess of the monolithic rear housing; and
the ratcheting member and the integral internal gear of the monolithic rear housing are positioned within the internal recess of the knob; and
one or more retaining members adapted to maintain the ratcheting member, the monolithic rear housing, and the knob in a pre-assembled configuration prior to a coupling of the pre-assembled housing assembly with the strap housing.
2. The adjustable strap apparatus of claim 1 , wherein the battery assembly comprises a printed circuit board, the opening being enclosed by the printed circuit board.
3. The adjustable strap apparatus of claim 1 , wherein the battery assembly comprises one or more battery cells.
4. The adjustable strap apparatus of claim 3 , wherein:
the left strap and the right strap are coupled to a head-mounted display device; and
the one or more battery cells provide power to the head-mounted display device.
5. The adjustable strap apparatus of claim 1 , wherein the battery assembly comprises a curved battery cell.
6. The adjustable strap apparatus of claim 1 , wherein:
the ratcheting member further comprises one or more radial supports, each radial support being coupled to one of the one or more pawls; and
each of the one or more pawls is oriented tangential to an axis of rotation of the shaft.
7. The adjustable strap apparatus of claim 6 , wherein:
the one or more radial supports and the one of the one or more pawls are formed from a single semi-rigid part; and
each of the one or more pawls is shaped to substantially resist a compressive force and deform in response to a bending force.
8. A head-mounted-display device comprising:
a display unit;
a display housing assembly containing the display unit;
a left strap coupled to the display housing assembly, the left strap comprising a first rack member;
a right strap coupled to the display housing assembly, the right strap comprising a second rack member;
a pinion member coupled to a proximal end of a shaft, the pinion member being adapted to:
engage the first rack member and the second rack member; and
translate the first rack member and the second rack member in opposite directions via rotation of the shaft;
a strap housing adapted to substantially prevent translational movement of the pinion member relative to the strap housing and maintain engagement of the pinion member with the first rack member and the second rack member;
a battery assembly having an opening sized to allow the shalt but not the pinion member to pass through; and
a pre-assembled housing assembly that, together with the strap housing, fully contains the battery assembly, the pre-assembled housing assembly comprising:
ratcheting member coupled to a distal end of the shalt, the ratcheting member comprising one or more pawls;
a monolithic rear housing comprising:
an integral internal gear adapted to engage the one or more pawls, the one or more pawls preventing rotation of the shaft when engaged with the integral internal gear; and
an integral external recess;
a knob coupled to the ratcheting member and comprising an internal recess, wherein:
the knob is positioned within the integral external recess of the monolithic rear housing; and
the ratcheting member and the integral internal gear of the monolithic rear housing are positioned within the internal recess of the knob; and
one or more retaining members adapted to maintain the ratcheting member, the monolithic rear housing, and the knob in a pre-assembled configuration prior to a coupling of the pre-assembled housing assembly with the strap housing.
9. The head-mounted-display device of claim 8 , wherein the battery assembly comprises a printed circuit board, the opening being enclosed by the printed circuit board.
10. The head-mounted-display device of claim 8 , wherein the battery assembly comprises one or more battery cells.
11. The head-mounted-display device of claim 8 , wherein the battery assembly comprises a curved battery cell.
12. An adjustable strap apparatus comprising:
a left strap;
a right strap;
a translation member coupled to a proximal end of a shaft, the translation member being adapted to:
engage the left strap and the right strap; and
translate the left strap and the right strap in opposite directions via rotation of the shaft;
a strap housing adapted to substantially prevent translational movement of the translation member relative to the strap housing and maintain engagement of the translation member with the left strap and the right strap;
a battery assembly having an opening sized to allow the shaft but not the translation member to pass through; and
a pre-assembled housing assembly that, together with the strap housing, fully contains the battery assembly, the pre-assembled housing assembly comprising:
a monolithic rear housing comprising:
a first retaining member; and
an external recess;
a second retaining member coupled to a distal end of the shaft, the second retaining member adapted to prevent rotation of the shaft in at least one direction when engaged with the first retaining member of the monolithic rear housing; and
a knob coupled to the second retaining member and comprising an internal recess, wherein:
the knob is positioned within the external recess of the monolithic rear housing; and
the first retaining member and the second retaining member are positioned within the internal recess of the knob; and
a third retaining member adapted to maintain the second retaining member, the monolithic rear housing, and the knob in a pre-assembled configuration prior to a coupling of the pre-assembled housing assembly with the strap housing.
13. The adjustable strap apparatus of claim 12 , wherein:
the left strap comprises a first gear rack;
the right strap comprises a second gear rack; and
the translation member comprises one or more pinion gears adapted to:
engage the first gear rack and the second gear rack; and
translate the first strap and the second strap in opposite directions via rotation of the shaft.
14. The adjustable strap apparatus of claim 12 , wherein:
the battery assembly comprises one or more battery cells;
the first retaining member comprises an integral internal gear; and
the second retaining member comprises a ratcheting member.
15. The adjustable strap apparatus of claim 1 , wherein a surface of the knob is flush with a surface of the monolithic rear housing.
16. The adjustable strap apparatus of claim 1 , wherein the pinion member and the shaft are two components of a single monolithic element.
17. The head-mounted-display device of claim 8 , wherein a surface of the knob is flush with a surface of the monolithic rear housing.
18. The head-mounted-display device of claim 8 , wherein the pinion member and the shaft are two components of a single monolithic element.
19. The adjustable strap apparatus of claim 12 , wherein a surface of the knob is flush with a surface of the monolithic rear housing.
20. The adjustable strap apparatus of claim 12 , wherein the translation member and the shaft are two components of a single monolithic element.
21. An adjustable strap apparatus comprising:
a left strap comprising a first rack member;
a right strap comprising a second rack member;
a pinion member, the pinion member having a diameter such that the pinion member is adapted to:
engage the first rack member and the second rack member; and
translate the first rack member and the second rack member in opposite directions via rotation of the pinion member;
a front housing maintaining engagement of the pinion member with the first rack member and the second rack member; and
a pre-assembled rear-housing assembly comprising:
a ratcheting member comprising one or more pawls;
a monolithic rear housing comprising:
an integral internal gear adapted to engage the one or more pawls, the one or more pawls, when engaged with the integral internal gear, preventing rotation of the pinion member; and
an integral external recess;
a knob coupled to the ratcheting member and comprising an internal recess, wherein the knob is positioned within the integral external recess of the monolithic rear housing, and the ratcheting member and the integral internal gear of the monolithic rear housing are positioned within the internal recess of the knob; and
one or more retaining members adapted to maintain the ratcheting member, the monolithic rear housing, and the knob in a pre-assembled configuration prior to a coupling of the pre-assembled rear-housing assembly with the front housing; and
a battery assembly having an opening sized smaller than the diameter of the pinion member, wherein the opening allows the pinion member to couple with the ratcheting member and the knob, and the front housing and the pre-assembled rear-housing assembly together fully contain the battery assembly.
22. The adjustable strap apparatus of claim 21 , wherein the pinion member comprises a shaft, and the shaft is coupled to the ratcheting member.
23. The adjustable strap apparatus of claim 21 , wherein the battery assembly comprises a battery pack.
24. The adjustable strap apparatus of claim 21 , wherein:
the left strap and the right strap are coupled to a head-mounted display device; and
the battery pack provides power to the head-mounted display device.