Patent ID: 7931308
Filing Date: 2011-04-26
Classification: F16L

Abstract:
1. An adapter clamp for clamping an adapting tube having an inner surface comprising: an adapter tube having an inner circumferential surface configured to clamp to an outer surface of the adapting tube; a first resilient ring placed in the inner circumferential surface of the adapter tube and including elastic material for expanding inward and clamping to an outer surface of the adapting tube; a hollow adjustment ring configured to be threaded to a circumferential surface of the adapter tube to generate a displacement force; a compression ring for translating the displacement force from the hollow adjustment ring to a longitudinal compressing displacement of the first resilient ring, causing an inner surface of the first resilient ring to fit to the outer surface of the adapting tube; a second resilient ring placed in the inner circumferential surface of the adapter tube and including elastic material for inward expanding and clamping to the outer surface of the adapting tube; and a spacer placed on the inner circumferential surface of the adapter tube for keeping the first resilient ring and the second resilient ring apart at a predetermined distance, wherein the adapting tube is a telescope eyepiece focuser draw tube.