Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1995-01-03
1998-06-30
Dombroske, George M.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73786, 73803, 73817, G01N 308
Patent
active
057737223
ABSTRACT:
A torque actuated tensile tester for proof loading anchors includes: an actuator, a left hand square nut, a right hand jam nut, an anchor head carrier, a housing, a slip gauge, and a keeper clip. The actuator has a cross-threaded portion and a portion engageable by a torque applying member. The housing has first and second ends, with the first end positionable circumjacent the anchor to be proof loaded and that is engageable with the structure to which the anchor is affixed. The left hand square nut is internally threaded with a single left hand thread that is engageable with the threaded portion of the actuator. The right hand jam nut is internally threaded with a single right hand thread that is engageable with the threaded portion of the actuator. The anchor head carrier is internally threaded with a single right hand thread that is engageable with the threaded portion of the actuator. The anchor head carrier has a flanged slot for receiving the head of an anchor for engagement. The right hand jam nut, the left hand square nut, and the anchor head carrier are threadedly attached to the actuator in use, and the threaded assembly is inserted into the housing. The left hand square nut is attachable to the second end of the housing when an anchor is engaged by the anchor head carrier. Furthermore, when the anchor is engaged by the anchor head carrier and a predetermined torque is applied to the engageable portion of the actuator by a torque applying member, the actuator tends to turn, thereby urging the anchor head carrier towards the left hand square nut, and in turn, applying a tensile force to the anchor. The left hand square nut transmits an equal and opposite force to the tensile force through the housing to the structure circumjacent the anchor, providing that the anchor does not slip. A slip gauge rests upon the anchor head carrier and indicates the extent of movement, if any, of the anchor head carrier with respect to the left hand square nut. A keeper dip is attached to the housing to secure the actuator, right hand jam nut, left hand square nut, and anchor head to the housing.
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"Proof Load Tester--Instruction Data", one page.
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