Abstract: 2. A shock crushable subfoundation comprising a base, a frame member reinforcing said base, an equipment support member, and deformation absorbing means interposed between said frame member and said equipment support member, said means including a universal joint connected to one of a pair of concentric cylinders joined in overlapping relationship by a press fit, whereby said deformation absorbing means are enabled to absorb plastic deformation of said base and said frame member.

Abstract: 1. A shock crush sub-foundation comprising a base, a frame member reinforcing said base, an equipment support member, and deformation absorbing means between said frame member and said equipment support member for absorbing plastic deformation of said base and said base frame member to prevent deformation of said support member, said deformation absorbing means comprising a hollow member containing viscous fluid and having an orifice normally sealed by a diaphragm which is designed to rupture upon plastic deformation of said base member and said frame member.