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 . A pre-assembled housing apparatus comprising:
a ratcheting member coupled to a distal end of a 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 resisting rotation of the shaft when engaged with the integral internal gear; and
a knob coupled to the ratcheting member and comprising an internal recess, wherein the ratcheting member and the integral internal gear of the monolithic rear housing are positioned within the internal recess of the knob,
wherein the knob is positioned at a rear of the monolithic rear housing,
wherein the ratcheting member, the monolithic rear housing, and the knob are in a pre-assembled configuration prior to a coupling of the pre-assembled housing apparatus with a strap housing.
2 . The pre-assembled housing apparatus of claim 1 , wherein the integral internal gear has a circular shape.
3 . The pre-assembled housing apparatus of claim 1 , wherein the one or more pawls comprise three pawls.
4 . The pre-assembled housing apparatus of claim 1 , wherein the monolithic rear housing comprises a battery housing shaped and sized for housing a battery.
5 . The pre-assembled housing apparatus of claim 4 , wherein the monolithic rear housing has a curved shape.
6 . The pre-assembled housing apparatus of claim 1 , wherein the monolithic rear housing comprises an opening at a center of the integral internal gear.
7 . The pre-assembled housing apparatus of claim 6 , wherein the opening comprises a through hole.
8 . The pre-assembled housing apparatus of claim 1 , wherein a face of the knob and a face of the monolithic rear housing are flush with one another.
9 . The pre-assembled housing apparatus of claim 1 , further comprising one or more retaining members maintaining the ratcheting member, the monolithic rear housing, and the knob in the pre-assembled configuration.
10 . An adjustable strap apparatus comprising: a left strap comprising a first rack member;
a right strap comprising a second rack member;
a strap housing covering the first rack member and the second rack member;
a pre-assembled housing apparatus coupled to the strap housing, the pre-assembled housing apparatus comprising:
a monolithic rear housing comprising an integral internal gear;
a ratcheting member comprising one or more pawls adapted to resist rotation when engaged with the integral internal gear; and
a knob coupled to the ratcheting member, the knob comprising an internal recess, wherein the ratcheting member and the integral internal gear are positioned within the internal recess of the knob,
wherein the knob is positioned at a rear of the monolithic rear housing,
wherein the ratcheting member, the monolithic rear housing, and the knob are in a pre-assembled configuration prior to coupling of the pre-assembled housing apparatus with the strap housing;
a shaft coupled to the ratcheting member; and
a pinion member affixed to the shaft and engaging the first rack member and the second rack member, the pinion member being adapted to translate the first rack member and the second rack member in opposite directions upon rotation of the shaft.
11 . The adjustable strap apparatus of claim 10 , further comprising a battery assembly including an opening, the battery assembly positioned between the strap housing and the monolithic rear housing.
12 . The adjustable strap apparatus of claim 11 , wherein the battery assembly comprises an opening, wherein the shaft passes through the opening.
13 . The adjustable strap apparatus of claim 12 , wherein the opening comprises a through hole.
14 . The adjustable strap apparatus of claim 11 , wherein:
the left strap and the right strap are coupled to a head-mounted display device; and the battery assembly provides power to the head-mounted display device.
15 . The adjustable strap apparatus of claim 14 , wherein the strap housing and the monolithic rear housing are curved to correspond to a back of a user's head.
16 . The adjustable strap apparatus of claim 10 , wherein the pre-assembled housing apparatus further comprises one or more retaining members maintaining the ratcheting member, the monolithic rear housing, and the knob in the pre-assembled configuration.
17 . The adjustable strap apparatus of claim 10 , wherein the pinion member is positioned between the first rack member and the second rack member.
18 . A method of fabricating an adjustable strap apparatus, the method comprising:
pre-assembling a housing apparatus, comprising:
coupling a knob to a ratcheting member comprising one or more pawls, the knob including an internal recess;
coupling a distal end of a shaft to the ratcheting member; and
rotatably coupling the knob and ratcheting member with a monolithic rear housing including an integral internal gear such that the ratcheting member and the integral internal gear are positioned within the internal recess of the knob and the one or more pawls of the ratcheting member are engaged with the integral internal gear, wherein the one or more pawls resist rotation of the shaft when engaged with the integral internal gear, wherein the knob is positioned
at a rear of the monolithic rear housing; and
coupling the pre-assembled housing apparatus with a strap housing.
19 . The method of claim 18 , further comprising, prior to coupling the pre-assembled housing apparatus to the strap housing:
coupling a pinion to a proximal end of the shaft;
positioning a first rack member of a left strap between the strap housing and the monolithic rear housing;
positioning a second rack member of a right strap between the strap housing and the monolithic rear housing; and
engaging the pinion with the first rack member and the second rack member.
20 . The method of claim 18 , further comprising, prior to coupling the pre-assembled housing apparatus to the strap housing:
positioning a battery assembly between the strap housing and the monolithic rear housing;
passing a proximal end of the shaft through an opening in the battery assembly; and coupling a pinion to the proximal end of the shaft.