Tensioning apparatus

Claim 1

A BOLT TENSIONING APPARATUS INCLUDING IN COMBINATION A HOUSING HAVING AN UPPER FACE FORMED WITH AN ANNULAR CHANNEL AND A FLUID CONDUCTING PORT COMMUNICATING THEREWITH, A LOAD TRANSMITTING ASSEMBLY COMPRISING A RING WITHIN SAID CHANNEL, A HEAD OVERLYING SAID RING AND AN INTERIORLY THREADED BOSS FIXED WITH RESPECT TO SAID HEAD AND EXTENDING DOWNWARDLY INTO SAID HOUSING, SAID HOUSING AND BOSS BEING FREE OF PARTS OBSTRUCTING THE COMPLETE WITHDRAWAL OF THE BOSS UNDER MANUAL ELEVATION OF THE HEAD OF SAID LOAD TRANSMITTING ASSEMBLY, SAID HEAD BEING ROTATABLE WITH RESPECT TO SAID HOUSING WHEREBY TO PERMIT COUPLING AND UNCOUPLING OF THE BOSS THREADS WITH THE THREADS OF A BOLT TO BE TENSIONED, SAID RING BEING PROJECTABLE FROM SAID CHANNEL UNDER THE ACTION OF FLUID PRESSURE AND THRUSTING THROUGHOUT THE ENTIRE AREA OF ITS UPPER FACE AGAINST THE UNDERSIDE OF SAID HEAD TO ELEVATE SAID ASSEMBLY, A NUT-ENGAGING WRENCH MOUNTED FOR MOVEMENT WITHIN THE LOWER END OF SAID HOUSING, AND REMOVABLE MEANS FOR NORMALLY RETAINING SAID NUT-ENGAGING WRENCH IN POSITION WITHIN SAID HOUSING AND SAID WRENCH BEING WITHDRAWABLE FROM THE HOUSING UPON SAID RETAINING MEANS BEING DETACHED THEREFROM.