Bidirectional mechanical load limiter

Brakes – Plastic deformation or breakage of retarder element – Crushable element

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74492, F16F 712

Patent

active

043612121

ABSTRACT:
A bidirectional mechanical load limiter for a push-pull control linkage includes a tubular crushable core that crushes in response to a predetermined tensile or compressive load to thereby limit the load in the linkage. The load limiter includes a tubular casing and a piston arranged in a telescoping configuration. The tubular crushable core, together with a pair of slide elements positioned adjacent the opposite ends of the core, is located within the casing by stop elements affixed to the inside of the casing. The piston passes through the bore of the tubular core and the slide elements and is retained in place by impeller elements affixed to the piston adjacent and abutting the slide elements. In normal operation, the load limiter operates as a rigid link in the linkage, with tensile and compressive loads being transmitted between the piston and casing through the crushable core. Under an excessive tensile load the piston and casing undergo relative extension as the core yields under the load. Likewise, under an excessive compressive load, the piston and casing undergo relative retraction and the crushable core is crushed inwardly into the casing. In the preferred embodiment, the crushable core is formed of an aluminum honeycomb material to provide a substantially constant force over the axial displacement range of the load limiter.

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