Importance

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Abstract

A linkage for rotatably joining two members of a structure together including a rod member (1); a sleeve (8) slideable over a bifurcated, cylindrical end portion of the rod member; a link member (3) pivoted within the ends of the said end portion and having two parallel sides profiled to provide a sliding fit within the sleeve, an angled side portion (16) against which the end of the sleeve is urged when the linkage is in a partly open position and a rounded, profiled end portion to provide clearance of the sleeve when the linkage is opening; pin and guide elements (12,14) for limiting the sliding movement of the sleeve on the end portion; and a coil spring (10) located around the end portion and between one end of the sleeve and a step on the rod member to provide a torque for opening the linkage when released from the closed position. A common base may carry a plurality of link members on each of which a rod member may be pivotally mounted, or alternatively a link member may be symmetrical in form and have a rod member pivotally mounted in similar fashion at each end.

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First Claim