Abstract: The wrench is for use with a bolt having an axial bore in which is located a pin. The pin is rotatable within the bore until the bolt is tensioned near its elastic limit, at which point rotation of the pin relative to the bolt is restrained.The wrench includes a body (12) drivingly carrying via dogs (20) a first socket (16) for engaging and driving a nut on the bolt. A second socket (28) engages a head on the pin. The first and second sockets (16,28) are connected to a common drive, the connection of the second socket (28) being in a coupling in which a pin (46) engages in a detent in a cam cylinder (50).When rotation of the pin relative to the bolt becomes restrain bed, the coupling (46,50) disengages, allowing the cam cylinder (50) to be urged outwardly of the housing (12) by a spring (60), to cause a warning indicator (58) to be displayed.

Abstract: The invention provides a bearing structure with a lubricant circulation that does not depend on gravity. An absorbent lubricant reservoir contacts a conical shaft portion so as to convey lubricant from the reservoir to a ball or like bearing. Lubricant passing the bearing is flung off a rotating flange by centrifugal force to a collector and then fed back by wicks to the reservoir. Air circulation is also provided by fan blades on the flange drawing air through the bearing from the reservoir side and returning it through passages around the bearing.