Incremental deployment device
View Patent ↗An incremental deployment device is provided. The incremental deployment device may include a first member with a slotted track having alternating deployment and braking segments, as well as a second member that is movably coupled with the first member and that includes a cam follower that is configured to travel within the slotted track. The deployment segments may be configured to allow relative movement between the first member and the second member with little resistance, whereas the braking segments may be configured to permit relative movement between the first member and the second member with much greater resistance or to not permit any relative movement between the first member and the second member at all. Thus, the first member and the second member may be allowed to accelerate relative to one another within the deployment segments, and are decelerated within the braking segments.
1. An apparatus comprising:
a first member;
a second member movably coupled to the first member such that the first member and the second member are transitionable from a first configuration to a second configuration;
one or more springs that are configured to urge the first member and the second member towards the second configuration;
a slotted track, wherein:
the slotted track is part of the first member,
the slotted track has opposing side walls that define two intermeshing sawtooth profiles, and
the slotted track includes a series of alternating deployment segments and braking segments;
a cam follower; and
a cam follower biasing device, wherein:
the cam follower biasing device is configured to bias the cam follower towards only one of the two opposing sidewalls,
the cam follower is constrained to travel within the slotted track,
the cam follower is movably connected with the second member, and
the cam follower, during relative movement between the first member and the second member from the first configuration to the second configuration, encounters the deployment segments and the braking segments in an alternating fashion,
the deployment segments and the braking segments are configured to:
cooperate with the cam follower during relative movement of the first member and the second member from the first configuration to the second configuration to limit the relative speed between the first member and the second member by permitting the relative motion between the first member and the second member to accelerate when the cam follower is in the deployment segments and by causing the relative motion between the first member and the second member to decelerate when the cam follower is in the braking segments, and
permit the first member and the second member to be transitioned from the first configuration to the second configuration subject only to the urging of the one or more springs.
2. The apparatus of claim 1 , wherein the alternating deployment and braking segments form a sawtooth pattern.
3. The apparatus of claim 1 , wherein the alternating deployment and braking segments form a repeating pattern.
4. The apparatus of claim 1 , wherein:
the slotted track follows a slotted track profile path,
each adjacent pair of braking and deployment segments partially overlap with one another when viewed along a direction perpendicular to a plane coincident with the slotted track profile path, and
the width of the slotted track in directions perpendicular to the slotted track profile path remains constant for substantially the entire length of the slotted track for portions of the slotted track profile that fall outside of regions where the braking segments and the deployment segments overlap.
5. The apparatus of claim 1 , wherein each deployment segment and each braking segment follow paths selected from the group consisting of: a straight path, a non-linear path, an arc-shaped path, and combinations thereof.
6. The apparatus of claim 1 , wherein the deployment segments and the braking segments are configured such that the cam follower traverses the deployment segments and the braking segments during relative motion between the first member and the second member without the relative motion between the first member and the second member reversing direction.
7. The apparatus of claim 1 , wherein the slotted track begins with a deployment segment and ends with a braking segment.
8. The apparatus of claim 1 , wherein for each deployment segment and the following braking segment:
the deployment segment is shaped so as to cause the cam follower to travel in a first direction when the first member is subjected to a first motive input with respect to the second member and the cam follower is within the deployment segment,
the first direction has a first component that is perpendicular to an axis spanning between non-contiguous ends of the deployment segment and the following braking segment,
the braking segment is shaped such that the cam follower travels in a second direction when the first member is subjected to the first motive input with respect to the second member and the cam follower is within the braking segment,
the second direction has a second component that is perpendicular to the axis spanning between the non-contiguous ends of the deployment segment and the following braking segment, and
the first component is in an opposite direction from the second component.
9. The apparatus of claim 8 , wherein:
the cam follower biasing device is configured to bias the cam follower in a third direction, and
the third direction has a third component that is in the same direction as the second component.
10. The apparatus of claim 8 , wherein each deployment segment has an average slope that is of a lower absolute magnitude than the average slope of the following braking segment with respect to the axis spanning between the non-contiguous ends of the deployment segment and the following braking segment.
11. The apparatus of claim 8 , further comprising a cam follower link, wherein:
the cam follower is supported by the cam follower link, and
the cam follower link is biased so as to press the cam follower towards the axes spanning between the non-contiguous ends of the deployment segments and the following braking segments.
12. The apparatus of claim 11 , wherein:
the cam follower link is configured to rotate about a cam follower link pivot, and
at least one of the braking segments is defined by arc-shaped walls that are centered on the cam follower link pivot and offset from one another such that the cam follower can traverse the at least one braking segment without corresponding movement between the first member and the second member.
13. The apparatus of claim 8 , further comprising a hinge pivot, wherein:
the first member and the second member are movably coupled by the hinge pivot, and
the slotted track travels at least partway around the hinge pivot.
14. The apparatus of claim 13 , wherein each deployment segment intersects with the braking segment following that deployment segment along an arc-shaped path centered on the hinge pivot.
15. The apparatus of claim 14 , wherein the arc-shaped path describes an arc of approximately 180° about the hinge pivot.
16. The apparatus of claim 13 , further comprising a first solar panel and a second solar panel, wherein:
the first solar panel is rigidly connected with the first member, and
the second solar panel is rigidly connected with the second member.
17. The apparatus of claim 8 , wherein the first member and the second member are configured to slide relative to one another along a first linear axis.
18. The apparatus of claim 17 , wherein the braking segments are substantially perpendicular to the first linear axis.