초록 ▼

A fastener and tightening device for exerting force and equalization of force upon the nut or head of a bolt or threaded stud. The device is comprised of a shank fitting through a support member within an abutment head adapted to be drawn up tight against the support member. A plurality of jack bolt

A fastener and tightening device for exerting force and equalization of force upon the nut or head of a bolt or threaded stud. The device is comprised of a shank fitting through a support member within an abutment head adapted to be drawn up tight against the support member. A plurality of jack bolts are threadedly engageable with holes in the head and are adapted to be tightened to exert pressure against the support member. Separate ball members are positioned between the jack bolts and a wear plate on the support member to minimize friction and provide for force equalization to counteract any off center alignment. The tightening device is particularly useful in a fastening device for equalization of pressure and stress gauging where the shank has a bore receiving a gauge pin fixed at one end in the bore with an opposite end extending through the head to support a rotary gauge which is free to rotate until the shank is stressed sufficiently to tighten the gauge against the head to indicate proper tensioning of the shank. By the use of the jack bolts appropriate tightening can be effected with proper equalization of force.

대표청구항 ▼

In a tightening device having an elongated shank and an abutment head adapted to be tightened against a fixed support provided with an opening receiving said shank, and a plurality of jack bolts threadly engageable with a plurality of threaded holes positioned circumferentially about said abutment h

In a tightening device having an elongated shank and an abutment head adapted to be tightened against a fixed support provided with an opening receiving said shank, and a plurality of jack bolts threadly engageable with a plurality of threaded holes positioned circumferentially about said abutment head and adapted to exert pressure against said support member, the improvement comprising a plurality of separate and discrete ball members closely receivable within said holes and positioned between bottom ends of said jack bolts and a wear plate supported by said support member, said ball members being composed of a metal having a hardness greater than the bottom ends of said jack bolts.