WO2003025405A1 - Ecrou a montage rapide - Google Patents

Ecrou a montage rapide Download PDF

Info

Publication number
WO2003025405A1
WO2003025405A1 PCT/GB2002/004231 GB0204231W WO03025405A1 WO 2003025405 A1 WO2003025405 A1 WO 2003025405A1 GB 0204231 W GB0204231 W GB 0204231W WO 03025405 A1 WO03025405 A1 WO 03025405A1
Authority
WO
WIPO (PCT)
Prior art keywords
condition
nut
bolt
fastening
fastening member
Prior art date
Application number
PCT/GB2002/004231
Other languages
English (en)
Inventor
Nicholas More
Original Assignee
Torque Tension Systems Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Torque Tension Systems Limited filed Critical Torque Tension Systems Limited
Publication of WO2003025405A1 publication Critical patent/WO2003025405A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/08—Quickly-detachable or mountable nuts, e.g. consisting of two or more parts; Nuts movable along the bolt after tilting the nut
    • F16B37/0807—Nuts engaged from the end of the bolt, e.g. axially slidable nuts
    • F16B37/0864—Nuts engaged from the end of the bolt, e.g. axially slidable nuts with the threaded portions of the nut engaging the thread of the bolt by pressing or rotating an external retaining member such as a cap, a nut, a ring or a sleeve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/06—Screw or nut setting or loosening machines
    • B23P19/067—Bolt tensioners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B29/00—Accessories
    • B25B29/02—Bolt tensioners

Definitions

  • the present invention relates to quick release nuts, and relates particularly, but not exclusively, to quick release nuts for use in hydraulic tensioning of bolts.
  • Tensioned bolts are used in many applications, such as connections between flanges at the ends of adjacent lengths of pipeline.
  • the bolt is tensioned by means of a hydraulic bolt tensioning tool, and a nut is screwed on to the- bolt while under tension.
  • the bolt tensioning tool has a hydraulic piston which acts on a ' reaction member in the form of a reaction nut screwed onto the free end of the bolt and which grips the bolt.
  • the bolt is extended when axial pressure is applied to the nut by means of the tensioning tool, and when the hydraulic pressure operating within the tensioning tool is released after a nut has been screwed onto the bolt under tension, the bolt contracts to " effect a secure connection.
  • the length of that part of the bolt protruding beyond the hydraulic bolt tensioning tool can be significant. This can cause difficulties if the reaction nut must be screwed onto the bolt, or removed from it after the connection using a tensioned bolt has been made. This is especially so in the case of damaged or rusted threads, or hostile environments such as undersea applications, where this process becomes time consuming and expensive.
  • EP0408239 discloses a split nut which addresses this problem by providing a pair of guide pins along which two segments of the split nut are slidable relative to each other between an inoperative position in which segments are spaced radially apart and an operative position in which the segments form a nut which can engage the thread of a bolt.
  • the segments are biassed towards their inoperative position by means of coil springs mounted on the guide pins, such that the coil springs react between end faces of the segments .
  • the guide pins are held in their operative position by means of ball bearings provided in the segments which are urged by means of a coil spring into engagement with a circumferential groove in the guide pins .
  • This known split nut suffers from the disadvantage that the force retaining the segments in their operative position is dependent upon the resilience and adjustment of the coil spring, as a result of which it is often difficult to effect positive and repeatable engagement of the ball bearings in the groove. Also, significant force needs to be applied to disengage the segments from each other towards the inoperative position, as a result of which disengagement of the two halves of the nut from their operative .position can become difficult.
  • OOO/65243 discloses a quick release nut which addresses this problem by providing ball bearings in one of the guide pins which engage a groove in the channel in which the guide pin slides.
  • the ball bearings are urged outwards towards the groove by means of a coil spring, the force of which can be overcome by pressing a pin provided on the guide pin.
  • FIGS 1A to ID A further known quick release nut is shown in Figures 1A to ID.
  • Figures 1A and IB show a quick release nut 1 having a pair of segments 2, 3 which slide relative to each other on pins 4 and are biased apart by means of coil springs 5.
  • a washer 6 is mounted to the segments 2, 3 by means of respective pins 7, 8, which fit within respective L-shaped slots 9, 10 in segments 2 , 3 such that rotation of washer 6 in the direction of arrow D in Figure IB relative to the segments 2,3 causes pins 7, 8 to move along L-shaped slots 9, 10 to draw the segments 2, 3 closer together as shown in Figures 1C and ID.
  • FIG. 2A to 2D A further known arrangement is shown in Figure Figures 2A to 2D, in which a cap 20 is mounted to pins 7, 8 which are located within segments 2 , 3 and are biased downwardly in Figure 2A by means of springs 21.
  • the pins 7, 8 have heads 22, 23 which are located in respective slots 24, 25 in cap 20, such that as the segments 2, 3 are pushed towards each other, the heads 22, 23 move along slots 24, 25 respectively, until the end faces of segments 2, 3 can be accommodated within cap 20.
  • the cap 20 then moves under the force of springs 21 to the position shown in Figures 2C and 2D to hold the segments 2, 3 in position relative to each other.
  • Preferred embodiments of the present invention seek to overcome the above disadvantages of the prior art .
  • a quick release nut comprising: -
  • a plurality of body members adapted to be placed around a shaft of a bolt and defining an engaging surface for engaging the shaft of the bolt, wherein the body members are adapted to be moved relative to each other between an operative condition in which said engaging surface is sized to engage the shaft of the bolt in use, and an inoperative condition in which said body members are spaced further apart than in said operative condition to allow the nut to slide axially relative to the shaft of the bolt;
  • locating means comprising, for each pair of adjacent body members in a circumferential direction around said surface, at least one elongate sliding member provided on a body member of said pair and slidable in a respective recess provided in the other body member of said pair;
  • fastening means separate from said locating means, and comprising at least one fastening member for engaging respective engagements on each body member of at least one said pair of adjacent body members, wherein a line joining said engagements of said fastening means lies on the opposite side of the corresponding said engaging surface from a longitudinal axis of said engaging surface, and said fastening member has a first condition, in which the fastening member engages the corresponding said engagements to maintain the corresponding said body members in the operative condition, and a second condition, in which the corresponding body members can move relative to each other to the inoperative condition.
  • the nut may further comprise first biasing means for urging at least one said fastening member towards the first condition thereof .
  • At least one said fastening member is adapted to move into the first condition thereof as a result of movement of said body members into said operative condition.
  • This provides the advantage of simplifying engagement of the nut with the shaft of a bolt, for example by constructing the fastening member such that it slides over a corresponding part of the engagement on the other body member of the pair to automatically engage the other body member.
  • At least one said fastening member may comprise a respective fastening portion for engaging a corresponding retaining surface on the engagement on the other said body member of said pair.
  • At least one said fastening member may be pivotally mounted relative to a said body member.
  • At least one said fastening member may be slidably mounted relative to a said body member.
  • At least one said engagement may comprise respective releasable retaining means, for releasably engaging a respective said fastening member.
  • the retaining means may comprise at least one retaining member provided on the respective other body member of at least one said pair of adjacent body members, wherein the or each said retaining member is moveable between a first condition in which the corresponding said fastening member engages said retaining member and a second condition in which said fastening member is released from said retaining member.
  • the fastening ' means may further comprise second biasing means for urging at least one said retaining member towards a first condition thereof .
  • the nut may comprise third biasing means for urging at least some of said body members towards said inoperative condition.
  • At least one said fastening member may be mounted to an external surface of the corresponding said body portion.
  • Figure 1A is a cross sectional elevation view of a first prior art quick release nut in an inoperative condition thereof;
  • Figure IB is a view from below of the nut of Figure 1A, the washer thereof being partially cut away to show slots in the segments of the nut;
  • Figure 1C is a view, corresponding to Figure 1A, of the nut of Figures 1A and IB in an operative condition thereof;
  • Figure ID is a view, corresponding to Figure IB, of the nut of Figure 1C;
  • Figure 2A is a cross sectional elevation view of a second prior art ' quick release nut in an inoperative condition thereof;
  • Figure 2B is a plan view of the nut of Figure 2A;
  • Figure 2C is a view, corresponding to Figure 2A, of the nut of Figures 2A and 2B in an inoperative condition thereof;
  • Figure 2D is a view, corresponding to Figure 2B, of the nut of Figure 2C;
  • Figure 3 is a cross-sectional plan view of a quick release nut of a first embodiment of the present invention in an inoperative condition thereof;
  • Figure 4A is an elevation view of the nut of Figure 3 along the direction of arrow A in Figure 3 ;
  • Figure 4B is an elevation view, corresponding to Figure 4A, of the nut of Figure 3 in an operative condition thereof;
  • Figure 5 is a schematic elevation view of a bolt ' tensioning tool using the nut of Figures 3 and 4 to tension a bolt;
  • Figure 6 is a partial plan view, corresponding to Figure 3, of a quick release nut of second embodiment of the present invention.
  • Figure 7A is an elevation view, corresponding to Figure 4A, of the nut of Figure 6 in an inoperative condition thereof;
  • Figure 7B is an elevation view, corresponding to Figure 4B, of the nut of Figure 6 in an operative condition' thereof;
  • Figure 8 is a partial plan view, corresponding to Figure 3, of a quick release nut of third embodiment of the present invention.
  • Figure 9 is an elevation view, corresponding to Figure 4A, of the nut of Figure 8 in an operative condition thereof.
  • a quick release nut 1 comprises a pair of opposed generally semi-circular body portions or segments 2,3, each of which has a generally semi-circular threaded internal surface 4.
  • Each of the segments 2,3 has a generally semi-cylindrical upper part 5 and a lower part 6 having a tapering outer surface 7 of generally semi- frustoconical appearance .
  • a pair of guide pins 8,9 are secured to corresponding recesses 10, 11 in end face 12 of - segment 3 and project outwardly from the end face 12.
  • a head 13 of pin 8 can slide within a corresponding channel 15 in the other segment 2 , and the segments 2,3 are urged apart by coil springs IS, 17 until the head 13 of pin 8 abuts a shoulder 18 of channel 15 as shown in Figure 3.
  • the segments 2,3 are urged apart to an inoperative position as shown in the Figure in which the nut 1 can easily slide along the shaft of a bolt (not shown) to be tensioned.
  • the segments 2,3 can be urged towards -each other against the force of the springs 16, 17 to an operative position ( Figure 4A) in which end faces 12, 19 of segments 2,3 are positioned closely adjacent to, but slightly spaced apart from, each other.
  • a quick release latch mechanism 20 includes a latch plate 21 pivotally connected to segment 2 by means of spring pin 22, and urged by means of coil spring 23 to the position shown in Figures 4A and 4B.
  • the coil spring 23 is located in a recess 24 in segment 2.
  • the latch plate 21 is provided with a hook portion 25 at an end thereof remote from the end engaged by the coil spring 23, and segment 3 is provided with a recess 26 having shoulder portion 27 such that when the segments 2,3 are urged towards each other into their operative position, the hook portion 25 slides over the shoulder portion 27 and snaps into the recess 26 via the resilience of the coil spring 23 and pivotal movement of the latch plate 21 about the spring pin 22, to retain the segments " 2,3 in their operative position.
  • the segments 2,3 can be released from their operative position by urging latch plate 21 against the resilience of the coil spring 23 to pivot the latch plate 21 about the spring pin 22, to release the hook portion 25 from the recess 26 on the segment 3. This allows the coil springs 16, 17 to urge the segments 2,3 apart towards their inoperative condition.
  • a bolt tensioning tool 30 for tensioning a bolt 31, to form a secure connection between a nut 32 and the bolt 31, has a piston 33 having a tapered end face 34 for engaging the frustoconical surface 7 of each segment 2, 3 of the quick release nut 1.
  • the end face 34 of the piston 33 is urged in the direction of arrow B in Figure 5 by means of hydraulic fluid entering annular chamber 35 via inlet 36.
  • the quick release nut 1 is slid onto the shaft of the bolt 31 in its inoperative condition as shown in Figures 3 and 4A and slid along the shaft to a position slightly above contact with the tapered end face 34 of the piston 33 of the hydraulic tensioning tool 30.
  • the segments 2,3 are then urged towards each other against the compressive force of the coil springs 16, 17, as a result of which the latch plate 21 is urged outwardly as the hook portion 25 thereof slides over the shoulder portion 27 of recess 26 of the opposing segment 3, and is then urged into engagement with the recess . 26 on the segment 3 by means of the coil spring 23, to hold the segments 2,3 in their operative condition as shown in Figure 4B .
  • the nut 1 is then rotated on the shaft along the screw thread of bolt 31 to bring it into engagement with the tapering end face 34 of the piston 33.
  • Hydraulic fluid is then introduced into annular chamber 35 via inlet 36, as a result of which the piston 33 urges the nut 1 upwards in the direction of arrow B. Because of the inclined end face 34 of the piston 11 and the cooperating lower surface 7 of the quick release nut 1, this urges the segments 2,3 towards each other, which tightens engagement of the threaded internal surface 4 of the quick release nut 1 with the screw thread on the shaft of the bolt 31. As a result, the bolt is placed under tension, and the nut 32 can be tightened.
  • the nut 1 In order to release the quick release nut 1 from the shaft of the bolt 31, the nut 1 is rotated to move it a short distance upwards along the shaft of the bolt 31 to bring it out of engagement with the end face 34 of the piston 33.
  • the latch plate 21 is then rotated about the spring pin 22 to release the hook portion 25 of the latch plate 21 from the recess 26 on the other segment 3. This allows the segments 2,3 to move apart under the force of the coil springs 16, 17, as a result of which the quick release nut 1 can be easily slid off the end of the shaft of the bolt 31.
  • a secure connection with the nut 32 is formed.
  • a quick release nut 101 of a second embodiment of the invention has a latch plate 121 having a hook portion 125 for engaging a pin 126 on segment 103.
  • the latch plate 121 is slidable mounted to segment 102 by means of pins 122, so that the latch plate 121 is slidable in the direction of arrow C out of engagement with pin 126 against the action of coil spring 123.
  • a third embodiment of the invention is shown in Figures 8 and 9, in which parts common to the embodiment of Figures 1 and 2 are denoted by like reference numerals but increased by 200.
  • a latch plate 221 having hook portion 225 is mounted to segment 202 by means of a pin 222, and the hook portion 225 engages a recess 226 behind shoulder portion 227 on a catch 240 on segment 203, the catch 240 being urged upwards by means of a coil spring 241.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Clamps And Clips (AREA)

Abstract

L'invention concerne un écrou à montage rapide, dans lequel une paire de segments (2, 3) qui sont conçus pour être placés autour d'une tige d'un boulon et qui définissent une surface d'engagement pour engager la tige du boulon. Les éléments du corps sont conçus pour être déplacés les uns par rapport aux autres entre une position de travail dans laquelle la surface d'engagement est dimensionnée pour engager la tige du boulon et une position de repos dans laquelle les éléments du corps sont plus écartés que dans la position de travail pour permettre à l'écrou de glisser latéralement par rapport à la tige de boulon. Une paire de chevilles (8, 9) est prévue sur un segment (3) de ladite paire et lesdites chevilles peuvent glisser dans leurs encoches respectives ménagées dans l'autre segment. Une plaque pour prisonnier (21) se déplace entre une première position, dans laquelle les segments (2, 3) sont maintenues en position de travail, et une seconde position, dans laquelle les segments (2, 3) peuvent être déplacés les uns par rapport aux autres dans une position de repos.
PCT/GB2002/004231 2001-09-18 2002-09-17 Ecrou a montage rapide WO2003025405A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0122486A GB0122486D0 (en) 2001-09-18 2001-09-18 Quick reaction nut
GB0122486.4 2001-09-18

Publications (1)

Publication Number Publication Date
WO2003025405A1 true WO2003025405A1 (fr) 2003-03-27

Family

ID=9922275

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/004231 WO2003025405A1 (fr) 2001-09-18 2002-09-17 Ecrou a montage rapide

Country Status (2)

Country Link
GB (1) GB0122486D0 (fr)
WO (1) WO2003025405A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2385262A1 (fr) * 2010-05-03 2011-11-09 Frank Hohmann Ecrou pour vissages, notamment écrou segmenté
WO2013113768A1 (fr) * 2012-02-01 2013-08-08 Koellges Ralf Procédé de fabrication d'un assemblage vissé à serrage mécanique et assemblage vissé pouvant être serré avec un boulon fileté et un écrou
CN105351334A (zh) * 2015-11-10 2016-02-24 北京科路工业装备股份有限公司 一种快装螺母
CN105909656A (zh) * 2016-06-25 2016-08-31 安徽工程大学机电学院 一种开合螺母及其使用方法
WO2023122808A1 (fr) 2021-12-22 2023-06-29 IMS Engineering (Pty) Ltd Ensemble écrou fendu
US11879493B2 (en) 2019-05-29 2024-01-23 Gordian Enterprises Inc. Split nut

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4901958A (en) * 1988-10-11 1990-02-20 Kelso Michael V Apparatus and method for suspending pipe rack
DE9007585U1 (fr) * 1990-04-09 1993-02-18 Hummel, Herbert, 7410 Reutlingen, De
EP0922527A1 (fr) * 1997-12-09 1999-06-16 Hydra-Tight Limited Dispositif tendeur
GB2349678A (en) * 1999-05-01 2000-11-08 Hara John Charles O Hinged split nut
EP1108902A1 (fr) * 1999-12-16 2001-06-20 Daniel Moser Système d'écrou rapide
WO2001088390A1 (fr) * 2000-05-16 2001-11-22 Arno Giehl Ecrou

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4901958A (en) * 1988-10-11 1990-02-20 Kelso Michael V Apparatus and method for suspending pipe rack
DE9007585U1 (fr) * 1990-04-09 1993-02-18 Hummel, Herbert, 7410 Reutlingen, De
EP0922527A1 (fr) * 1997-12-09 1999-06-16 Hydra-Tight Limited Dispositif tendeur
GB2349678A (en) * 1999-05-01 2000-11-08 Hara John Charles O Hinged split nut
EP1108902A1 (fr) * 1999-12-16 2001-06-20 Daniel Moser Système d'écrou rapide
WO2001088390A1 (fr) * 2000-05-16 2001-11-22 Arno Giehl Ecrou

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2385262A1 (fr) * 2010-05-03 2011-11-09 Frank Hohmann Ecrou pour vissages, notamment écrou segmenté
US8297903B2 (en) 2010-05-03 2012-10-30 Frank Hohmann Segmented nut for screw connections
US8911192B2 (en) 2010-05-03 2014-12-16 Frank Hohmann Segmented nut for screw connections
WO2013113768A1 (fr) * 2012-02-01 2013-08-08 Koellges Ralf Procédé de fabrication d'un assemblage vissé à serrage mécanique et assemblage vissé pouvant être serré avec un boulon fileté et un écrou
CN105351334A (zh) * 2015-11-10 2016-02-24 北京科路工业装备股份有限公司 一种快装螺母
CN105909656A (zh) * 2016-06-25 2016-08-31 安徽工程大学机电学院 一种开合螺母及其使用方法
US11879493B2 (en) 2019-05-29 2024-01-23 Gordian Enterprises Inc. Split nut
WO2023122808A1 (fr) 2021-12-22 2023-06-29 IMS Engineering (Pty) Ltd Ensemble écrou fendu

Also Published As

Publication number Publication date
GB0122486D0 (en) 2001-11-07

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