Abstract

A socket for rotatably fastening or unfastening a jackbolt of a multi jackbolt tensioner the socket extending between a first end and a second end such that the first end is adapted to receive the jackbolt, the socket comprising: a passage extending along a length of the socket to receive a head of the jackbolt, the passage being defined by a plurality of even-numbered internal side walls dimensioned to engage a plurality of sides of the head of the jackbolt received therein, the socket having a central axis with diametrically opposed pairs of said side walls being parallel to each other, and pairs of adjacent side walls meeting to form corner portions to receive corners of the jackbolt head; a plurality of guiding members arranged circumferentially about an opening of the passage to guide the head of the jackbolt into the passage and align the plurality of sides of the head of jackbolt such that corners of the jackbolt head are aligned into position with corner portions of said pairs of adjacent side walls.

IPC Classes  ?

• B25B 13/06 - SpannersWrenches with rigid jaws of socket type
• B25B 23/10 - Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
• B25B 29/02 - Bolt tensioners
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load

Abstract

wherein application of hydraulic pressure to one or more of the plurality of pressure chambers displaces the first body section from the load bearing member thereby tensioning said fastening member and whereby subsequent tensioning of the fastening member is applied by operation of the jack bolts.

IPC Classes  ?

• B23P 19/06 - Screw or nut setting or loosening machines
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load
• F16D 1/033 - Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges

Abstract

A tensioning apparatus is adapted to simultaneously tension a number of jackbolts of a multi jackbolt tensioner. The tensioning apparatus may be made compact by overlapping gear disks of the spindle gears and further act as a torque multiplier between the other gears of the tensioning apparatus. The tensioning apparatus can be part of a combination with a power transfer assembly.

IPC Classes  ?

• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 17/00 - Hand-driven gear-operated wrenches or screwdrivers
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load

Abstract

A multi jack tensioner including: a body portion formed to engage an elongate fastening member or integrally formed therewith; a load bearing member for applying force to a workpiece to be fastened and arranged for location about said fastening member adjacent the body portion; a pressure chamber between the load bearing member and the body portion arranged to displace the body portion from the load bearing member in response to hydraulic pressure; and a plurality of jack bolts extending between the body portion and the load bearing member for further displacing the body portion from the load bearing member; wherein application of hydraulic pressure to the hydraulic chamber displaces the body portion from the load bearing member for tensioning said fastening member and whereby subsequent tensioning of the fastening member is applied by operation of the jack bolts.

IPC Classes  ?

• B23P 19/06 - Screw or nut setting or loosening machines
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load
• F16D 1/033 - Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges

Abstract

A multi jack tensioner for applying tension to a fastener, the tensioner comprising: a body having at least one section, including a first body section formed to engage an elongate fastening member or integrally formed therewith, a load bearing member for applying force to a workpiece to be fastened and arranged for location about said fastening member adjacent the body, a plurality of pressure chambers between the load bearing member and the body arranged to displace the at least one body section axially relative to the load bearing member in response to hydraulic pressure, and a plurality of jack bolts extending between the body section and the load bearing member for further displacing the first body section from the load bearing member, wherein application of hydraulic pressure to one or more of the plurality of pressure chambers displaces the first body section from the load bearing member thereby tensioning said fastening member and whereby subsequent tensioning of the fastening member is applied by operation of the jack bolts.

IPC Classes  ?

• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load

Abstract

An assembly for simultaneously tensioning a plurality of jackbolts of a multi-jackbolt tensioner, the apparatus comprising: a first tensioning device comprising a first plurality of spindles arranged to simultaneously tension the plurality of jackbolts to an initial tightened configuration, the spindles being arranged to interrupt delivery of torque to one or more of the jackbolts when the one or more of the jackbolts attain an initial torque value; and a second tensioning device comprising a second plurality of spindles arranged to simultaneously tension the initially tightened plurality of jackbolts to a subsequent tightened configuration by delivering torque to all of the jackbolts simultaneously to attain a pre-determined torque value that is greater than the initial torque value.

IPC Classes  ?

• B25B 23/14 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 29/02 - Bolt tensioners
• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose

Abstract

A tensioning apparatus is provided that is arranged to simultaneously tension a plurality of jackbolts of a multi jackbolt tensioner (MJT). The tensioning apparatus has a housing that is arranged for receiving a drive gear from a drive unit. The tensioning apparatus includes one or more planetary gears that are retained within the housing and which mesh with the drive gear in use. A ring gear encircles the one or more planetary gears and meshes with them. A plurality of spindle gears is retained in the housing. Each of the spindle gears has a spindle for coupling to a respective one of the jackbolts. The spindle gears are located around the ring gear and mesh with teeth on an outside of the ring gear. In use the drive gear rotates the one or more planetary gears to thereby rotate the spindle gears via the ring gear to thereby tension the jackbolts. The tensioning apparatus may be made compact by overlapping gear disks of the spindle gears and acts as a torque multiplier between the planetary gears and the spindle gears.

IPC Classes  ?

• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 29/02 - Bolt tensioners
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load

Abstract

A socket for rotatably fastening or unfastening a jackbolt of a multi jackbolt tensioner: the socket extending between a first end and a second end such that the first end is adapted to receive the jackbolt, the socket comprising: a passage extending along a length of the socket to receive a head of the jackbolt, the passage being defined by a plurality of even-numbered internal side walls dimensioned to engage a plurality of sides of the head of the jackbolt received therein, the socket having a central axis with diametrically opposed pairs of said side walls being parallel to each other, and pairs of adjacent side walls meeting to form corner portions to receive corners of the jackbolt head; a plurality of guiding members arranged circumferentially about an opening of the passage to guide the head of the jackbolt into the passage and align the plurality of sides of the head of jackbolt such that corners of the jackbolt head are aligned into position with corner portions of said pairs of adjacent side walls.

IPC Classes  ?

• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 13/06 - SpannersWrenches with rigid jaws of socket type
• B25B 23/10 - Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
• B25B 29/02 - Bolt tensioners
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load

Abstract

A socket for rotatably fastening or unfastening a jackbolt of a multi jackbolt tensioner: the socket extending between a first end and a second end such that the first end is adapted to receive the jackbolt, the socket comprising: a passage extending along a length of the socket to receive a head of the jackbolt, the passage being defined by a plurality of even-numbered internal side walls dimensioned to engage a plurality of sides of the head of the jackbolt received therein, the socket having a central axis with diametrically opposed pairs of said side walls being parallel to each other, and pairs of adjacent side walls meeting to form corner portions to receive corners of the jackbolt head; a plurality of guiding members arranged circumferentially about an opening of the passage to guide the head of the jackbolt into the passage and align the plurality of sides of the head of jackbolt such that corners of the jackbolt head are aligned into position with corner portions of said pairs of adjacent side walls.

IPC Classes  ?

• B25B 13/06 - SpannersWrenches with rigid jaws of socket type
• B25B 23/10 - Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 29/02 - Bolt tensioners
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load

Abstract

A multi jack tensioner including: a body portion formed to engage an elongate fastening member or integrally formed therewith; a load bearing member for applying force to a workpiece to be fastened and arranged for location about said fastening member adjacent the body portion; a pressure chamber between the load bearing member and the body portion arranged to displace the body portion from the load bearing member in response to hydraulic pressure; and a plurality of jack bolts extending between the body portion and the load bearing member for further displacing the body portion from the load bearing member; wherein application of hydraulic pressure to the hydraulic chamber displaces the body portion from the load bearing member for tensioning said fastening member and whereby subsequent tensioning of the fastening member is applied by operation of the jack bolts.

IPC Classes  ?

• B25B 29/02 - Bolt tensioners
• B23P 19/06 - Screw or nut setting or loosening machines
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load
• F16D 1/033 - Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges
• G21C 13/06 - Sealing-plugs

Abstract

A multi jack tensioner including: a body portion formed to engage an elongate fastening member or integrally formed therewith; a load bearing member for applying force to a workpiece to be fastened and arranged for location about said fastening member adjacent the body portion; a pressure chamber between the load bearing member and the body portion arranged to displace the body portion from the load bearing member in response to hydraulic pressure; and a plurality of jack bolts extending between the body portion and the load bearing member for further displacing the body portion from the load bearing member; wherein application of hydraulic pressure to the hydraulic chamber displaces the body portion from the load bearing member for tensioning said fastening member and whereby subsequent tensioning of the fastening member is applied by operation of the jack bolts.

IPC Classes  ?

• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 29/02 - Bolt tensioners
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load
• F16D 1/033 - Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges
• G21C 13/06 - Sealing-plugs