Eyewear traction devices and methods
Eyewear can be provided that include at least a support and a traction surface that allows the eyewear to be retained on a user's face. The support can include at least an earstem and a face. The traction surface can be coupled to a portion of the support. The traction surface can provide a greater amount of traction force before slipping when subject to forces in certain directions and can provide a lesser amount of traction force before slipping when subject to forces in other directions.
1. An eyewear comprising:
a support configured to be carried on a head of a user and configured to support a lens in a field of view of the user, the support comprising:
an earstem comprising an exterior surface configured to be positioned proximate a lateral side of the user's head and a user's ear during use; and
a nosepiece comprising an exterior surface configured to be positioned proximate a user's nose during use; and
a traction surface on at least one of the earstem and the nosepiece, the traction surface being configured to exert a traction force on a contact surface at a plurality of contact points within the contact surface, the traction force being configured to inhibit slipping of the eyewear on the user's head when worn, wherein at a contact point within the contact surface, the traction surface is configured such that:
when subject to a force in a first direction within a plane tangent to the contact surface at the contact point, the traction surface can exert up to a first amount of traction force before slipping, and
when subject to a force in a second direction within the plane tangent to the contact surface at the contact point, the traction surface can exert up to a second amount of traction force before slipping,
wherein the first amount of traction force is greater than the second amount of traction force, and
wherein the traction surface comprises a plurality of micro-scale or nano-scale protrusions extending from the exterior surface on which the traction surface is located.
2. The eyewear of claim 1 , wherein:
the traction surface is on at least the nosepiece and the contact surface is at least a portion of the user's nose; and
at one or more contact points within the contact surface, the first direction extends generally downwardly and anteriorly relative to the user's nose and forms an acute angle with a first axis, the first axis being within the plane tangent to the contact surface at the one or more contact points and parallel to a horizontal axis.
3. The eyewear of claim 1 , wherein:
the traction surface is on at least the earstem and the contact surface is at least a portion of the user's ear; and
at one or more contact points within the contact surface, the first direction extends generally anteriorly relative to the user's ear.
4. The eyewear of claim 3 , wherein the plurality of protrusions extend obliquely from the exterior surface on which the traction surface is located.
5. The eyewear of claim 1 , wherein the traction surface is on both the earstem and the nosepiece.
6. The eyewear of claim 1 , wherein the plurality of protrusions extends obliquely from the exterior surface on which the traction surface is located, wherein a vector defines the extension of the plurality of protrusions and wherein at least a component of the vector is generally opposite the first direction.
7. The eyewear of claim 6 , wherein the plurality of protrusions extending obliquely from the exterior surface is more parallel with the exterior surface than perpendicular.
8. The eyewear of claim 6 , wherein the plurality of protrusions extending obliquely from the exterior surface is more perpendicular to the exterior surface than parallel.
9. The eyewear of claim 6 , wherein the plurality of protrusions extending obliquely from the exterior surface is generally equally perpendicular to the exterior surface as parallel.
10. The eyewear of claim 1 , wherein the traction surface is integrally formed on the support.
11. The eyewear of claim 1 , wherein the traction surface is formed on a traction member, wherein the traction member is attached to the support.
12. An eyewear comprising:
a support configured to be carried on a head of a user and configured to support a lens in a field of view of the user, the support comprising:
an earstem comprising an exterior surface configured to be positioned proximate a lateral side of the user's head and a user's ear during use; and
a nosepiece comprising an exterior surface configured to be positioned proximate a user's nose during use; and
a traction surface on at least one of the earstem and the nosepiece, the traction surface being configured to exert a traction force on a contact surface at a plurality of contact points within the contact surface, the traction force being configured to inhibit slipping of the eyewear on the user's head when worn, wherein at a contact point within the contact surface, the traction surface is configured such that:
when subject to a force in a first direction within a plane tangent to the contact surface at the contact point, the traction surface can exert up to a first amount of traction force before slipping, and
when subject to a force in a second direction within the plane tangent to the contact surface at the contact point, the traction surface can exert up to a second amount of traction force before slipping,
wherein the first amount of traction force is greater than the second amount of traction force,
wherein the traction surface is integrally formed on the support, and
wherein the traction surface is formed from a same material as a material of portions of the support adjacent the traction surface.
13. An eyewear comprising:
a support configured to be carried on a head of a user and configured to support a lens in a field of view of the user, the support comprising:
an earstem comprising an exterior surface configured to be positioned proximate a lateral side of the user's head and a user's ear;
a nosepiece comprising an exterior surface configured to be positioned proximate a user's nose; and
a traction surface on at least one of the earstem and the nosepiece, the traction surface comprising a plurality of protrusions extending obliquely from the exterior surface on which the traction surface is located and configured to exert a traction force on a contact surface at a plurality of contact points within the contact surface, the traction surface being configured such that:
when subject to a force in a first direction within a plane tangent to the contact surface at one or more contact points within the plurality of contact points, the traction surface can exert up to a first amount of traction force before slipping, and
when subject to a force in a second direction within the plane tangent to the contact surface at the one or more contact points, the traction surface can exert up to a second amount of traction force before slipping,
wherein the first amount of traction force is greater than the second amount of traction force,
wherein a vector defines the oblique extension of the plurality of protrusions from the exterior surface, and
wherein at least a component of the vector is generally opposite the first direction.
14. The eyewear of claim 13 , wherein the traction surface is on at least the nosepiece, the contact surface being at least a portion of the user's nose, the traction force being configured to inhibit slipping of the eyewear on the user's head when worn, wherein at a contact point within the contact surface:
the first direction extends generally downwardly and anteriorly relative to the user's nose and forms an acute angle with a first axis, the first axis being within the plane tangent to the contact surface at the one or more contact points and parallel to a horizontal axis.
15. The eyewear of claim 14 , wherein the one or more contact points comprise a majority of contact points within the contact surface.
16. The eyewear of claim 13 , wherein the traction surface comprises a first portion and a second portion, wherein:
at a first contact point within a first portion of the contact surface, the first portion of the traction surface is configured such that:
when subject to the force in the first direction within a plane tangent to the first portion of the contact surface at the first contact point, the traction surface can exert up to the first amount of traction force before slipping, and
when subject to the force in the second direction within a plane tangent to the first portion of the contact surface at the first contact point, the traction surface can exert up to the second amount of traction force before slipping,
wherein the first amount of traction force is greater than the second amount of traction force; and
at a second contact point within a second portion of the contact surface, the second portion of the traction surface is configured such that:
when subject to a force in a third direction within a plane tangent to the second portion of the contact surface at the second contact point, the traction surface can exert up to a third amount of traction force before slipping, and
when subject to a force in a fourth direction within a plane tangent to the second portion of the contact surface at the second contact point, the traction surface can exert up to a fourth amount of traction force before slipping,
wherein the third amount of traction force is greater than the fourth amount of traction force; and
wherein the first direction is different from the third direction.
17. The eyewear of claim 13 , wherein the traction surface is integrally formed on the support and wherein the traction surface is formed from a same material as a material of portions of the support adjacent the traction surface.
18. The eyewear of claim 13 , wherein the traction surface is formed on a traction member, wherein the traction member is removably attached to the support.
19. The eyewear of claim 13 , wherein the protrusions are nano-scale protrusions.
20. The eyewear of claim 13 , wherein the protrusions are micro-scale protrusions.