Riverhawk Company

Timothy J Trautman

Robert Michael Whitney

Richard Joseph Donegan

Charles B Gibbons

Patrick Shawn Reilly

A system for tensioning a stud that projects from a structural member is provided. The system comprises a safety guard including a guard housing and a hydraulic interlock assembly, and a tensioning system coupled with a first end of the stud. The guard housing surrounds at least a portion of the tensioning system and is coupled with a second end of the stud and the hydraulic interlock assembly. The hydraulic interlock assembly is coupled with the guard housing and the tensioning system. The hydraulic interlock assembly provides fluid communication of a hydraulic fluid from a hydraulic source to the tensioning system to tension the stud.

Safety guard for a hydraulic device

A tensioning system for tensioning a stud is provided. The system includes an adapter ring having an external surface, an internal surface engaging the external surface of the stud or puller screw, and at least two bores defined therein. The posts have first and second ends and are disposed in the bores. The first ends are supported by a stop surface, and the second ends extend outwardly from the bores. A cylinder includes an internal surface engaged with the external surface of the adapter ring. First and second pistons are movably positioned within the cylinder with an intermediate cap disposed therebetween to define first and second hydraulic chambers. The first piston is configured for being supported by the second ends of the posts. The hydraulic chambers are hydraulically connected to one another, whereby providing a hydraulic fluid in the chambers operates to apply a tension force on the stud.

Hydraulic rod tensioning system

A tensioning system for tensioning a stud is provided. The system includes a nut having an external surface, an internal surface engaging the external surface of the stud or puller screw, and at least two bores defined therein. The posts have first and second ends and are disposed in the bores. The first ends engage a stop surface, and the second ends extend outwardly from the bores. A cylinder includes an internal surface engaged with the external surface of the nut, and has a bore defined therein. A locking screw may be threadably positioned within the cylinder bore and engages the nut. A piston is positioned within the cylinder to define a hydraulic chamber and is configured for being engaged with the second ends of the posts. Further, a biasing member is disposed between the nut and piston. A tensioning system safety guard is also provided.

A stud tensioning device includes a nut having internal threads and external threads. The internal threads engage corresponding threads on the stud. At least two axial bores are defined by the nut, and posts are disposed in the bores. Each post at a first end thereof engages a stop surface, and at a second end thereof extends external to the bores and axially beyond a free end of the stud in a direction away from the structural member. A load cell threadingly engages the nut applying an axially-directed force on the posts in a direction toward the structural member and on the nut in a direction away from the structural member to thereby tension the stud.

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East Aurora, NY, United States of America

Timothy J Trautman