Accession Number : ADD001934

Title :   Expansion Bolt for Use in Soft and Porous Materials.

Descriptive Note : Patent Application,


Personal Author(s) : Hallanger,Lawrence W ; Brackett,Ronald F

Report Date : 03 Nov 1975

Pagination or Media Count : 12

Abstract : The patent application relates to an expansion rock bolt for use in soft materials, such as coral, which is assembled on a rod and inserted in a predrilled hole for attachment. Fingers within a shell assembly are set by drawing a cone up into a cavity in the shell assembly which forces the fingers to spread outwardly into the surrounding soft material. The setting process is accomplished by a linear pull upwardly on the rod and cone while pushing down on the sleeve assembly or by using a threaded cone and rod, and rotating the rod to draw the cone up into the sleeve assembly. A planar bending section is provided between the fingers and the collar portion of the sleeve assembly to prevent fracture of the sleeve material during the setting process. Travel of the cone into the sleeve stops when adequate resistance to the expansion of the fingers is provided by the surrounding material.

Descriptors :   *Bolts, *Attachment, *Underwater equipment, Patents, Expansion, Sleeves, Conical bodies

Subject Categories : Couplers, Fasteners, and Joints
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE