Flex connection system
Aspects of the disclosure provide a flex connection for high altitude balloon applications. During operation flex connection allows a payload of a high-altitude balloon to remain level when an envelope of the balloon is tilted, in order to change the direction of the balloon. As an example, a system may include a balloon envelope, a payload, a cable between the balloon envelope and the payload, and a flex connection on the cable. The flex connection enables the payload to remain level relative to the ground when the balloon is in flight and the balloon envelope is tilted relative to the payload. The flex connection includes a top portion, a plurality of discs, and a bottom portion.
1 . A system comprising:
a cable; and
a flex connection on the cable which enables a first object to remain level relative to a ground when a second object at is tilted relative to the first object, the flex connection including:
a top portion;
a plurality of discs each including a set of slots arranged around a perimeter of the given disc and a set of fingers arranged around the perimeter, each finger of the set of fingers having two protrusions configured to be compressed relative to one another in order to mate with a slot of an adjacent disc of the plurality of discs; and
a bottom portion, and
wherein the top portion, each of the plurality of discs and the bottom portion each include an opening through which the cable is threaded.
2 . The system of claim 1 , further comprising a first crimp ferrule located adjacent to the top portion and a second crimp ferrule located adjacent to the bottom portion, the first crimp ferrule and the second crimp ferrule being configured to maintain a position of the flex connection relative to the cable.
3 . The system of claim 1 , wherein the first object is arranged at a first end of the cable and the second object is arranged at a second end of the cable.
4 . The system of claim 1 , wherein the flex connection is configured such that when the flex connection is flexed an amount of the cable between the top portion and the bottom portion does not change.
5 . The system of claim 1 , wherein a first disc of the plurality of discs is connected to the top portion.
6 . The system of claim 5 , wherein a second disc of the plurality of discs is connected to the bottom portion.
7 . The system of claim 6 , wherein a third disc of the plurality of discs is located between the first disc and the second disc and between the top portion and the bottom portion, the third disc being slidable relative to the first disc or the second disc.
8 . The system of claim 6 , wherein the top portion includes a set of top portion slots configured to connect to a respective one of the set of fingers carried by said first disc.
9 . The system of claim 5 , wherein the bottom portion includes a set of teeth and a second disc includes a set of slots configured to connect to a respective one of the set of teeth.
10 . The system of claim 1 , wherein each given disc of the plurality of discs includes a hollow dome with a central opening.
11 . The system of claim 1 , wherein the top portion and the bottom portion are crimped onto the cable.
12 . A flex connection system comprising:
a flex connection configured to enable a first object to remain level relative to a ground when a second object is tilted relative to the first object, the flex connection including:
a top portion;
a plurality of discs each including a set of slots arranged around a perimeter of the given disc and a set of fingers arranged around the perimeter, each finger of the set of fingers having two protrusions configured to be compressed relative to one another in order to mate with a slot of an adjacent disc of the plurality of discs; and
a bottom portion, and
wherein the top portion, each of the plurality of discs and the bottom portion each include an opening.
13 . The system of claim 12 , further comprising a first crimp ferrule located adjacent to the top portion and a second crimp ferrule located adjacent to the bottom portion, the first crimp ferrule and the second crimp ferrule being configured to maintain a position of the flex connection relative to the cable.
14 . The system of claim 12 , further comprising a cable, wherein the flex connection is configured such that when the flex connection is flexed an amount of the cable between the top portion and the bottom portion does not change.
15 . The system of claim 12 , wherein a first disc of the plurality of discs is directly adjacent to the top portion, a second disc of the plurality of discs is directly adjacent to the bottom portion, and a third disc of the plurality of discs is located between the first disc and the second disc and between the top portion and the bottom portion, the third disc being slidable relative to at least one of the first disc or the second disc.
16 . The system of claim 15 , wherein the top portion includes a set of top portion slots configured to connect to a respective one of the set of fingers carried by said first disc.
17 . The system of claim 15 , wherein the bottom portion includes a set of bottom portion teeth and the second disc includes the set of slots configured to connect to a respective one of the set of bottom portion teeth.
18 . The system of claim 12 , wherein each given disc of the plurality of discs includes a hollow dome with a central opening.
19 . A method of configuring a flex connection on a cable, the method comprising:
providing a plurality of discs each including a set of slots arranged around a perimeter of the given disc and a set of fingers arranged around the perimeter, each finger of the set of fingers having two protrusions configured to be compressed relative to one another in order to mate with a slot of an adjacent disc of the plurality of discs
threading a bottom portion onto the cable such that the cable passes through a tubular portion of the bottom portion;
threading a first disc onto the cable such that the cable passes through a central opening in the first disc from a bottom surface of the first disc towards a top surface of the first disc;
threading a second disc onto the cable such that the fingers of the second disc are lined up with the slots of the first disc and domes of the first and second discs are lined up with one another and the two protrusion of each finger of the second disc are compressed relative to one another in order to mate with a respective one of the slots of the first disc;
threading additional discs onto the cable until a last, top disc is threaded onto the cable; and
threading a top portion onto the cable such that the cable passes through a tubular portion of the top portion such that the top portion, each of the plurality of discs and the bottom portion each include an opening through which the cable is threaded,
whereby a flex connection on the cable is provided which enables a first object to remain level relative to the ground when a second object at is tilted relative to the first object.
20 . The method of claim 19 , wherein mechanically attaching the top portion includes inserting the top portion into a mechanical link to provide at least two axial degrees of freedom.