Low-travel key mechanism for an input device

1. A key mechanism, comprising:

a switch housing defining a set of switch pin retaining mechanisms on opposing sides of the switch housing; and

a single hinged structure comprising:

two symmetric wings constrained to one another by a flexible hinge; and

a switch housing pin located on each of the two symmetric wings and extending into a respective switch pin retaining mechanism of the set of switch pin retaining mechanisms.

2. A hinged structure, comprising:

two separate wings positioned adjacent to each other such that a cavity is formed between the two wings;

coupling elements that couple the two wings together;

multiple switch housing pins on each arm of the wings that extend into the cavity; and

keycap pins on each arm of the wings that extend out from an exterior surface of the wing.

3. The hinged structure of claim 2 , wherein the wings are formed from a first material and the coupling elements are formed from a second, different material.

4. The hinged structure of claim 3 , wherein the coupling elements are formed with a fabric.

5. The hinged structure of claim 3 , wherein at least a portion of each coupling element is formed with a fabric.

6. An electronic device comprising:

an enclosure; and

a keyboard assembly positioned at least partially within the enclosure, the keyboard assembly comprising:

a substrate positioned within the enclosure;

a switch housing positioned over the substrate and defining switch pin retaining mechanisms on opposing sides of the switch housing; and

a hinged structure positioned adjacent to the switch housing and comprising:

wings positioned adjacent to each other such that a cavity is formed between the wings;

coupling elements operative to couple the wings together; and

multiple switch housing pins on each arm of the wings that extend into the cavity and couple to the switch pin retaining mechanisms in the switch housing.

7. The electronic device of claim 6 , wherein:

the switch pin retaining mechanisms comprise multiple U-shaped switch pin retaining mechanisms on each of two opposing sides of the switch housing; and

the U-shaped switch pin retaining mechanism have opening that faces one another.

8. The electronic device of claim 6 , wherein:

the switch pin retaining mechanisms comprise multiple switch pin retaining mechanisms on each of two opposing sides of the switch housing; and

at least one switch pin retaining mechanism on each side of the switch housing comprises a U-shaped pin retaining mechanism having an opening that faces another switch pin retaining mechanism on a same side of the switch housing.

9. The electronic device of claim 6 , wherein:

the switch pin retaining mechanisms comprise multiple switch pin retaining mechanisms on each of two opposing sides of the switch housing;

a first switch pin retaining mechanism on each side of the switch housing comprises a U-shaped switch pin retaining mechanism having an opening that faces a keycap; and

a second switch pin retaining mechanism on a same side of the switch housing comprises a U-shaped switch pin retaining mechanism having an opening that faces away from the first switch pin retaining mechanism.

10. The electronic device of claim 6 , wherein the coupling elements are formed with a fabric.

11. The electronic device of claim 6 , wherein:

the switch pin retaining mechanisms comprise multiple switch pin retaining mechanisms on each of two opposing sides of the switch housing; and

each switch pin retaining mechanism defines a cutout in a respective side of the switch housing.

12. The electronic device of claim 6 , wherein:

the switch pin retaining mechanisms comprise multiple switch pin retaining mechanisms on each of two opposing sides of the switch housing; and

at least one switch pin retaining mechanism on each side of the switch housing comprises a cutout in a respective side of the switch housing.

13. The electronic device of claim 11 or claim 12 , wherein:

the cutout is a first cutout; and

each cutout includes a lead-in cutout adjacent the first cutout.

14. The electronic device of claim 6 , wherein the wings of the hinged structure each comprise keycap pins extending outward from exterior surfaces of the wings.

15. The electronic device of claim 14 , further comprising:

a keycap comprising keycap pin retaining mechanisms that are configured to couple to the keycap pins;

a membrane layer attached to the substrate; and

a dome switch coupled to the membrane layer and positioned in the cavity of the hinged structure.

16. The electronic device of claim 15 , wherein the switch housing substantially surrounds the dome switch and is positioned between the dome switch and the hinged structure.

17. The electronic device of claim 15 , wherein:

the switch pin retaining mechanisms comprise multiple U-shaped switch pin retaining mechanisms on each of two opposing sides of the switch housing; and

the U-shaped switch pin retaining mechanisms include openings that face the keycap.

18. A method of assembling a key mechanism, comprising:

bending a flexible switch housing that includes a set of blind recesses;

positioning the bended switch housing within a cavity of a hinged structure that includes a set of switch housing pins;

and

unbending the flexible switch housing such that each switch housing pin of the set of switch housing pins is inserted into a blind recess of the set of blind recesses.

19. The method of claim 18 , further comprising attaching the switch housing to a membrane in the key mechanism.

20. The method of claim 18 , further comprising attaching the switch housing to a substrate in the key mechanism.