Patent ID: 7610686

Claim:
A device that can be part of archery apparatus that supports viewing parts on bows; the device comprising: a support structure that, in use, is supported on a bow; an elevation structure that, in use, supports a viewing part, the elevation structure being movable in an elevation direction relative to the support structure; the elevation structure having first and second opposite sides and, in use, receiving pressure in a direction approximately perpendicular to the elevation direction from the first side toward the second side; and first and second guide surface sets that are disposed toward the first and second sides of the elevation structure, respectively, and that each include one or more guide surface pairs; each guide surface pair including a respective guide surface on the support structure and a respective guide surface on the elevation structure; in use, each pair's respective guide surfaces sliding against each other in the elevation direction; each of the first and second guide surface sets having a respective effective span across which it is affected when the elevation structure receives pressure from the first side; the first set's effective span being within a stable range relative to the second set's effective span.