Hinge joints

Integrating a joint function in the cross-section is a design widely used in extrusion manufacture.

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A movement of up to 180º can be achieved with only two extrusions. If a greater degree of movement is required, this can be achieved by introducing more parts.

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The two joints shown above are very simple examples of this technique. The one on the right has a movement of approximately 40º. The one on the left has a movement of >90º and can be separated. Such a joint may be suitable for use with a movable cover.

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This is a relatively common suggested design for interlocking joints between extrusions and has a very unwieldly shape, with a hinged column and a sliding hinged extrusion part inserted.

The heavy-duty design used to achieve the narrow column that the joint function is based on produces a tool that clearly has a propensity to damage. In addition, there is some doubt as to the integrity of the joint function as it is based on sliding surfaces and relatively close fit tolerances.

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