Expandable anchor bolt

Claim 1

An anchor bolt, comprising, in combination: a. an open ended expandable housing; b. a fluid material arranged in the expandable housing; c. support means including a casing provided with at least one slot arrangeable extending through a hole in a partition for positioning the expandable housing through the partition; and d. actuator means for compressing the fluid material and causing same to expand the expandable housing when the latter is through the partition and prohibiting the housing and casing from passing back through the hole in the partition, the expandable housing being arranged in the casing for expansion through the slot, said casing being in the form of a length of tubing provided with a plurality of substantially parallel coextensive, lengthwise extending, normally closed slots adjacent an end of the tubing, the expandable housing is a sleeve arranged in the end of the tubing provided with the slots and constructed from a ductile material, and the fluid material is a plurality of balls, said actuator means including a generally cylindrical elongated piston movably and guidingly disposed in the casing and abutting an end of the expandable housing, a screw-threaded bolt connected to the piston and arranged extending from the casing in a direction away from the expandable housing, said bolt having a rounded end received in a socket in the end of the piston remote from the balls to maintain the threaded bolt in alignment with the piston and a cap mounted on an end of the casing spaced from the expandable housing, the cap being provided with a screw-threaded bore with which the bolt threadingly engages, said casing being provided with a plug arranged at an end of the casing adjacent the expandable housing and spaced from the cap, the plug having a conical portion directed into the other open end of the expandable housing within the casing for wedging the balls toward the slots said cap being provided with means for preventing rotation of the cap relative to the partition, said actuator means being arranged extending from the casing at one side of the partition, and the casing extends through the partition, with the slots being arranged in a portion of the casing extending beyond the partition from a side of the partition spaced from the one side with the casing expanding to a size larger than the hole through the partition with the slots opening to permit the housing to expand to a size larger than the hole for engaging the periphery of the hole with a substantially continuous area of contact.