Patent ID: 8398345

Claim:
A clamp for clamping a work piece together through an aperture, the work piece having an accessible side and a blind surface, the clamp comprising: a spacer comprising a first internally threaded portion and a bore; a bolt engaged through said first internally threaded portion and said bore, said bolt comprising a head portion, an externally threaded portion and an intermediate portion therebetween, wherein said first internally threaded portion is constructed and arranged to threadingly engaged said externally threaded portion; an expander positioned on said externally threaded portion, said expander comprising first and second end portions, a second internally threaded portion adjacent said second end portion and a bulbing portion between said first and second end portions, wherein said second internally threaded portion is threadingly engaged on said externally threaded portion; a shank positioned on said bolt between said spacer and said first end portion, wherein said shank is constructed and arranged to advance through said bore; and a blocking means that prevents said shank from advancing through said bore until rotation of said bolt causes said bulbing portion to form a flange, wherein said intermediate portion is constructed and arranged to allow said spacer to be free of threaded engagement with said bolt when said expander is threadingly engaged with said externally threaded portion.