AU593280B2

AU593280B2 – Apparatus for tensioning studs
– Google Patents

AU593280B2 – Apparatus for tensioning studs
– Google Patents
Apparatus for tensioning studs

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Publication number
AU593280B2

AU593280B2
AU62489/86A
AU6248986A
AU593280B2
AU 593280 B2
AU593280 B2
AU 593280B2
AU 62489/86 A
AU62489/86 A
AU 62489/86A
AU 6248986 A
AU6248986 A
AU 6248986A
AU 593280 B2
AU593280 B2
AU 593280B2
Authority
AU
Australia
Prior art keywords
segments
stud
housing
pull member
apertures
Prior art date
1985-09-20
Legal status (The legal status 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 status listed.)

Ceased

Application number
AU62489/86A
Other versions

AU6248986A
(en

Inventor
Derek L. Aldred
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Haskel International LLC

Original Assignee
Haskel Inc
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.)
1985-09-20
Filing date
1986-09-08
Publication date
1990-02-08

1986-09-08
Application filed by Haskel Inc
filed
Critical
Haskel Inc

1987-03-26
Publication of AU6248986A
publication
Critical
patent/AU6248986A/en

1990-02-08
Application granted
granted
Critical

1990-02-08
Publication of AU593280B2
publication
Critical
patent/AU593280B2/en

2006-09-08
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

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Classifications

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

Description

COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION FOR OFFICE USE Form Short Title: Int. Cl: 6 12If 87 Application Number: Lodged: 593280 Complete Specification-Lodged: Accepted: Lapsed: Published: Priority: *99* 9 9. 4 9 .4 9. 9 9, #449 4 .949 .9 9 9 49 41 4 4 4*1<4 Related Art: TO BE COMPLETED BY APPLICANT Name of Applicant: Address of Applicant: Actual Invertor: Address for Service: HASKEL, INC. 100 East Graham Place, Burbank, CA, U.S.A. Derek L. Aldred GRIFFITH HASSEL FRAZER 71 YORK STREET SYDNEY NSW 2000 AUSTRALIA t1 t 1 Complete Specification for the inventiun entitled: APPARATUS FOR TENSIONING STUDS The following statement is a full description of this invention, including the best method of performing it known to me/us:- 6995A:rk 0 ff P02 2027 Field Of The Invention The present invention relates to a tensioning apparatus for use in securing a nut to a threaded stud. Background Of The Invention There arf many situations in which a nut must be secured to a threaded stud and a predetermined tension applied to the Otud. (The term "stud" as used herein includes bolts as well as studs that are integrally formed 10 with other structures.) As the nut becomes tighter, the I frictional forces increase g.eatly and in most instances non-linearly. It therefore becomes more and more difficult t to determine the stud tension by measuring the torque applied t 4t a to tA nut. A method of cvercoming this difficulty is to pull the stud axially, directly applying a predetermined tension, and then turning the nut, applying only a small torque. The stud is then released, but it is held in tension by the nut. One exemplary environment in which this stud tensioning technique is used is in making up joints in large diameter pipelines. The numerous studs in these joints must be subjected to a repeated pattern of increasing tension, each stud being tensioned in a number of uuccessive operatCons. If stud tensioning apparatus is -sed, ilt must therefi mak a very large ,number of enigagements wih the stud befor the job is completed. To make up a single joint I v P02 2027 may take a four or five person crew an entire shift. Not only are labor costs high but the down time may be a much greater cost. The apparatus commonly used to tension the studs of such a joint includes a nut-like member that must be rotated to engage and disengage each stud, making the apparatus time-consuming to use. The design of such apparatus is limited by the small width of the flange on which the studs are located and the close proximity of the studs to one another. One particularly problematic design consideration arises from the fact that the studs often are not precisely perpendicular to the flange, making proper engagement of the S stud threads for tensioning purposes difficult. Devices have been rroposed that would not be threaded onto the studs, but would grasp the threads of the studs by the clamping motion of a jaw, However, these devices have not been found to be satisfactory due to an Sinability to combine a compact strtcture with strength, durability, speed and ease of operation. An objective of the present invention is to provide an improved stud tensioning apparatus that does not rely on rotation to engage the studs and that is capable of meeting the above criteria. 2- P0* P02 2027 1W P02 2027 Summary of the Invention The stud tensiloning apparatus of the present invention employs an array of jaw segments each having an inwardly facing surface with grooves thereon adapted to engage threads on a stud. Each segment has an attachment porti)n extending from its inwardly facing surface and deflincg an aperture. Preferably, the segments are arcuate and contiguous, forming a cylinder that surrounds the stud. A pull member disposed along an axis about which the segments are arranged has a plurality of hangers projecting radially from that axis into the apertures. Preferably, the hangers fit loosely into the apertures, permitting pivotal movement of the segments in two perpendicular directions to S, compensate for misalignment between the pull member and the q, stud. In one form of the invention the apertures and the hangers are generally rectangular. A mchanism is provided for urging the segments inwardly against the stud and confining the segments radially. Preferably this takes the form of a rotatable sleeve having an inner cam surface. The sleeve can be confined within a housing. A return spring may be included that forces the jaw segments outwardly Against the sleeve. An actuator mechanism applies an axial force to the pull member and thus to the segments and the stud. In a preferred form of the invention, this actuator mechanism takes the form of a piston, to which the pull member is secured, that is reciprocable in a hydraulic cylinder. ,3 P02 2027 The apparatus may include a mechanism for rotating a nut in threaded engagement with the stud. Other features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention. Brief DescriDtion of, the Drawings Figure 1 shows a stud tensioning device, constructed in accordance with the preseit invention, positioned for use S. in connection with a pipeline joint; Fig. 2 is a three-dimensional pictorial illustration S«I of the stud tensioning device; t c Fig. 3 is an enlarged cross-sectional view of the stud tensioning device and a fragmentary portion of a flange, along with the stud to be tensioned, taken along the line 3-3 of Fig. 1; Fig. 4a is a transverse cross-sectional view of the stud tehsioning device, taken substantially along the line S 20 4a-4a of Fig. 3 and showing the device in its engaged position; Fig. 4b is a transverse cross-sectional view similar to 4a, but showing the device in a disengaged position; Fig. 5 is another transverse cross-sectional view taken substantially alcng the line 5-5 of Fig, 3; i 4 P02 2027 Fig. 6 is a side elevation of a single jaw segment of the device; and Fig. 7 is a three-dimensional exploded view of the pull member jaw segments and return spring of the device. Description of the Preferred Embodiment A stud tensioning device 10, shown in Fig. 2, includes a cylindrical housing 12 that contains a plurality of jaw segments 14, one of which is shown separately in Fig. 6. The jaw segments 14 are arranged to form a cylinder about 4L the central axis of the housing 12, as best shown in the cross-sectional views of Figs. 4a and 4b and the exploded view of Fig. 7. In this embodiment, there are four such segments 14. SEach segment 14 has an inwardly facing engagement surface 16 provided with grooves that are generally transverse but set at a small spiral angle so as to be adapted to engage the threads of a stud 18, as shown in Fig. 3. At the top end of the engagement surface 16 is a transverse recess 20 that is larger and deeper than the grooves of the surface 16. When the four segments 14 are assembled contiguously to form a cylinder, the recesses form a circle, as best shown in Fig. 3. Above the recess and extending from the engagement surface 16, each segment 14 includes an attachment portion 22 that defines a generally rectangular aperture 24 with rounded corners, the aperture being best shown in Figs. 6 and 7. I Positioned generally above the segments 14, as best P02 2027 shown in Figs. 3 and 7, is a pull member 26. This member 26 has a cylindrical center portion 27 that is aligned with the center axis of the housing 12 and the cylinder formed by the segments 14. Projecting radially from the lower end of the pull member 26 are four equally-spaced integrally-formed hangers 28 of generally rectangular cross-section, as best shown in Fig. 7. These hangers 28, which are perpendicular to the center axis, are loosely received by the apertures 24 of the segments 14. A clearance 29 equal to at least one pitch of threads of the bolt 18 is provided between the top of the jaw segments 14 and th* bottom of the pull member 26 S to permit vertical adjustment of the segments for alignment S with the bolt threads. The top end of tha center portion 27 of the pull f member 26 is threaded and thus secured within a bore in a I C g* projection 30 that extends downwardly from the center of th6 bottom face of a piston 32. The piston 32 is reciprocable within an hydraulic cylinder 34 defined by the top of the housing 12 and a disk-like end plate 36. Appropriate seals 38 are carried by the piston 36. At the bottom of its stroke, the piston 32 comes into contact with an annular stop Splate 40 which carries a seal 41 that engages the cylindrical outer surface of the projection 30. The stop plate carries an upwardly projecting anti-rotation pin 42 received by a recess 43 in the bqtom ef the piston 26 when the piston is at the bottom of its stroke, thus preventing rotation of the piston and the components that reciprocate with it. 6 0 n P02 2027 The piston 32 is driven away from the stud 1.8 to Iapply a tensioning force when hydraulic fluid Ja admitted through a port 44 just above the stop plate 40. The piston 32 is double-acting and is returned toward the stud 18, either hydraulically or pneumatically, by the admission of fluid through a port 46 at the center of the end plate 36. Disposed within the housing 12 so as to surround and radially confine the, segments 14 is a rotatable sleeve 48. The inner surface of the sleevi, 48 is not cylindrical but rather f orms a cam surface, as best shown in Figs., 4a and 4b, such that the inside diameter of the sleeve varies considerably depending upon the, line along which it is *Oak measured, The sle~eve 48 can be rotated to a disengagement, '~~:position, shown in Fig. 4b, in which the outsides of the segments 14 fit into recesses 50 defined by the "am surface of the sleeve, thus permitting the segments 14 to move radially away from the stud 18 to the. greatest extent possible. As the sleeve 48 is rotated in a counterclockwise direction from the disengagement position of Fig. 4b to the engagement position of Fig. 4a, the cam surfaces 52 adjacent to the recesses 50 push the segments 1.4 inwardly toward, the stud 18. The grooves on the engagement surfaces 16 of the segments 14 then securely receive and interlc~k with the threads of the stud.18. The apparatus 10 1ilao includes a shift lever 54 that projects from the sleeve 48 through a slot 56 in the housing 12. The sleeve 48, can thus be rotated between the disengagement *position of Fig. 4b and the engagement position -7- XI P02 2027 of Fig. 4a by a force applied manually to the lever 54. Disposed within the circular recess 20 defined by the segments 14 is a circular return spring 59, best shown in Figs. 3 and 7. The spring 59 resiliently urges the segments 14 radially outwardly toward the disengagement position of Fig. 4b. Although the housing 12 is generally cylindrical, it includes a rounded projection 58 extending from its bottom end. An external knurled knob 60 is mounted on the projection 58, as best shown in Figs. 2 and 3. Manual rotation of the knob 60 turns a shaft 62, thus causing 0. rotation of a gear 64, which in turn rotates an idler gear 66 and a toothed wrench member 68, as best shown in Figs. 3 and 5. The wrench member 68 defines a hexagonal socket at its center in which a nut 70 that threadedly engages the stud 18 3 is received. Accordingly, the nut 70 can be rotated and caused to move axially along the Stud 18 by turning the knob The operation of the device 10 will now be explained with reference to the pipeline joint illustrated in Fig. 1. Two pipeline sections 74 and 76 carry mating flanges 78 and respectively, which come together with a ring-shaped seal 82 between them. A large iumber of studs 18 in the form of bolts project through the flanges 78 and 80, the studs being closely spaced and arrayed in a circular configuration. Each stud 18 carries a nut 70. make up a joint between the two pipe sections 74 and 76, and properly seat the seal 82, it is necessary to tension the studs 18 in a predetermined P02 2027 pattern. As is well knomn to persons skilled in this'art, it is not pocaible to tension any one stud fully in a single operation. Rather, each stud must have its tension increased by a small incremental amount each time the pattern is repeated. To increase the tension on a chosen stud 18, the apparatus 10 is placed over that stud 18 so that the corresponding nut 70 is received by the wrench member 68. As best shown in Fig. 3, the pipe section 74 tapers outwardly where it meets its integrally-formed flange 80. Therefore, the housing 12 is cut away to form an inclined flat portion 84 at its lower end, which accommodates the enlarged portion 86 of the section 74. too: When the apparatus 10 is first positioned over the 154 stud 18,, the segments 14 must be in their disengagement position illustrated in Fig. 4b, so that the grooves on the engagement surfaces 16 of the segments do not engage the threads of the stmd, For this reason, the shift lever 54 must be pushed fully to its most counterclockwise position so that the segments 14 fit into the recesses 50 defined by the sleeve 48. It should be noted that the return spring 59 pushes the uegments 14 outwiardly into the recesses 50 so that the segments do not prematurely engage the stud I8, once the apparatus 10 has been positioned over the stud 18, the shift lever 54 is moved clockwise to the position shown in Fig. 2, thereby rotating the sleeve 48 to the engagement p~sitiont shown in Fig. 4a, in which the cam surfaces 52 force- the segments 14 inwardly. The pin 42 P02 2027 prevents the segments 14 from rotating with the sleeve 48. The grooves of the engagement surfaces 16 thus interlock with the threads of the stud 18. At this point, the arcuate segments 14, which are then contiguous, are held in position not only by their engagement with the sleeve 48 but by their abutment against each other, so that they form a cylinder fully encircing the stud 18. It should be noted, however, that the central axis of the apparatus 10 is not always precisely aligned with the stud 18. It is desirable for the apparatus 10 to include some provision for compensating for this type of misalignment. For this reason it is important that the apertures 24 are slightly larger than the hangers 28 that they receive. The segments 14 are therefore able to pivot on the hangers 28 in two perpendicular directions. That is, they can pivot so that their lower ends swing toward and away from the stud 18 (arrow A in Fig. 7) and they can pivot from side to side (arrow B in Fig. 7) without moving toward or away from the stud 18. In addition, the allowances between the hangers 28 and the sides of the apertures 24 permit a small axial movement of the segments to align the grooves of the engagement surfaces 16 with the threads of the studs 18, Once the segments 14 are fully engaged with the stud 18, hydraulic fluid is admitted through the port 44, forcing the piston 32 to move within the cylinder 44 and causing the pull member 28 to move the segments 14 and the stud 18 axiall y from the flange 80. This creates a small gap 88 between the nut 70 and the flange 80 as the stud 18 is J V P02 2027 stretched. The nut 70 is then turned, causing it to move axially along the stud 18 until it engages the flange The hydraulic pressure is then released. The shift lever 54 is then moved, rotating the sleeve 48 so that the segments 14 disengage the stud 18, allowing the apparatus 10 to be removed from that stud and placed over a different stud. Of course, the same apparatus 10 can be used to reduce the tension on a stud if the nut 70 is rotated in the opposite directLon while the stud 18 is held in tension, after which the stud 18 is released. While a particular form of the invention has been illustrated and described, it will be apparent that various S" modifications can be made without departing from the spirit and scope of the invention. t a* rc t 11 Claims (13) 2. The apparatus of claim 1 wherein said segments are arcuate and contiguous. 3. The apparatus of claim 1 further comprising means for resiliently urging said segments radially apart. 4. The apparatus of claim 1 wherein said radial coni'inement means comprises a rotatable sleeve surrounding said segments and having a cam surface on the inside thereof. 1 -12- OIL- pt P02 2027 The app~ratus of claim 1 wherein said hangers fit loosely within said apertures, permitting pivotal movement of said segments in two perpendicular directions to compensate for misalignment between said pull member and said stud. 6. The apparatus of claim 5 wherein said apertures and said hangers are generally rectangular. 7. The apparatus of claim 1 further comprising means for rotating a nut in threaded engagement with said stud. 4 .4 8. The apparatus of claim 1 wherein said actuator means comprises a hydraulic cylinder and piston. *t 9. The apparatus of claim 1 wherein said jaw segments are arcuate and combine to form a cylinder surrounding said stud. A stud tensioning apparatus comprising: a housing; an array of contiguous arcuate jaw segments disposed within said housing and forming a cylinder surroundinq said stud, each of said segments having inwardly facing engagement surfaces with grooves thereon adapted to engage threads on said stud and an attachment portion extending from said surface and defining an aperture therin; 13 1 2 SP02 2027 a pull member disposed along an axis about which said segments are arrayied and having a plurality of hangers projecting radially from said axis into said apertures, said hangers fitting loosely within said apertures to permit pivotal movement of said segments in two perpendicular directions to compensate for misalignment between said pull member and said stud; radial confinement means for urging said segments radially inwardly against said stud, said confinement means comprising a sleeve disposed within said housing and surrounding said segments and having a cam surface on the 020' inside thereof actuator means for applying an axial tensioning force to said pull member and thus to said segments and said studi and means mounted on said housing for rotating a nut in 2 threaded engagement with said stud. 11. The apparatus of claim 10 further comprising means for resiliently urging said segments radially %part. 12. The apparatus of claim 10 wherein said inner 2- surfaces of said segments define a circular reces said apparatus further comprising return spring means disposed within said recess for urging said segments outwardly against said sleeve. 14 14 -o I -t 4C s 4 *q'4 P02 2027 13. The apparatus of claim 10 wherein said actuator means comprises an hydraulic cylinder and a piston. 14. The apparatus of claim 10 wherein said actuator means comprises a piston to which said pull member is secured and an hydraulic cylinder in which said piston is reciprocable. The apparatus of claim 10 wherein said apertures and said hangers are generally rectangular. 16. A stud tensioning apparatus comprising: a housing; an array of four contiguous arcuate jaw segments disposed within said housing and forming a cylinder surrounding said stud, each of said segments having an inwardly facing engagement surface defining grooves adapted to engage the threads on said studs and defining a spring receiving recess, and each of said segments having an attachment portion extending from said surface and definig a rectangular aperture therein; a pull member disposed along an axis about which said segments are arranged and having four hangers of rectangular cross-section projecting radially from said axis into said apertures, said hangere fitting loosely within said apertures to permit pivotal movement of said segments in two perpendicular directions to compensate for misalignment between said pull member and said stud; radial confinement means for urging said segments 15 P02 2027 radially inwardly against said stud, said confinement means 23 comprising a sleeve disposed within said housing and surrounding said segments and having a cam surface on the inside thereof; actuator means for applying an axial force to said pull member and thus to said segments and said stud, said actuator means comprising a piston in which said pull member is received and an hydraulic cylinder in which said piston is reciprocable; and means mounted on said housing for rotating a nut in threaded engagement with said stud. a at 17. A stud tensioning apparatus substantially as hereinbefore described with reference to the accompanying drawings. Dated this 8th day of September 1986 HASKEL, INC. By their Patent Attorney GRIFFITH HASSEL FRAZER AU62489/86A 1985-09-20 1986-09-08 Apparatus for tensioning studs Ceased AU593280B2 (en) Applications Claiming Priority (2) Application Number Priority Date Filing Date Title US06/778,220 US4604918A (en) 1985-09-20 1985-09-20 Apparatus for applying tension to studs US778220 1985-09-20 Publications (2) Publication Number Publication Date AU6248986A AU6248986A (en) 1987-03-26 AU593280B2 true AU593280B2 (en) 1990-02-08 Family ID=25112659 Family Applications (1) Application Number Title Priority Date Filing Date AU62489/86A Ceased AU593280B2 (en) 1985-09-20 1986-09-08 Apparatus for tensioning studs Country Status (4) Country Link US (1) US4604918A (en) EP (1) EP0220472A1 (en) AU (1) AU593280B2 (en) CA (1) CA1256681A (en) Cited By (1) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title AU668484B2 (en) * 1993-06-16 1996-05-02 Unex Corporation Mechanical tensioner Families Citing this family (5) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title EP0224622A3 (en) * 1985-11-20 1987-11-11 Haskel, Inc. Apparatus for tensioning a threaded stud or like member DE19810039C2 (en) * 1998-03-09 2002-09-12 Carl Walter Schraubwerkzeug Fa Assembly method for resiliently packaged plates and a device for performing this method FR2905460B1 (en) * 2006-09-01 2009-08-07 Skf Ab METHOD AND DEVICE FOR CONTROLLING HYDRAULIC CLAMPING OF ONE OR MORE BOLTS. US9188146B1 (en) 2010-08-05 2015-11-17 Riverhawk Company Hydraulic rod tensioning system GB2580115B (en) * 2018-12-21 2021-08-25 Caterpillar Energy Solutions Gmbh Device for tensioning and tightening a screw Citations (2) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title GB869527A (en) * 1958-06-11 1961-05-31 Maurice Jerry Finn Stud drivers US4175453A (en) * 1977-04-22 1979-11-27 Kraftwerk Union Aktiengesellschaft Device for tensioning several screw bolts Family Cites Families (6) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title US1898726A (en) * 1932-06-20 1933-02-21 Ford Motor Co Stud driver GB527552A (en) * 1939-03-07 1940-10-11 Stewart Warner Corp Electric fuel pumps DE938420C (en) * 1943-11-11 1956-01-26 Daimler Benz Ag Tool for removing studs, pins, pipe sockets or the like. US3995828A (en) * 1975-09-16 1976-12-07 Biach Industries, Inc. Bolt tensioning apparatus US4315446A (en) * 1979-04-30 1982-02-16 Orban Joseph N Stud tensioning device DE3318941A1 (en) * 1983-05-25 1984-11-29 Wirth Maschinen- und Bohrgeräte-Fabrik GmbH, 5140 Erkelenz DEVICE FOR ROTATING AND AXIAL MOVING BOLTS 1985 1985-09-20 US US06/778,220 patent/US4604918A/en not_active Expired - Lifetime 1986 1986-09-08 AU AU62489/86A patent/AU593280B2/en not_active Ceased 1986-09-18 EP EP86112888A patent/EP0220472A1/en not_active Withdrawn 1986-09-19 CA CA000518657A patent/CA1256681A/en not_active Expired Patent Citations (2) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title GB869527A (en) * 1958-06-11 1961-05-31 Maurice Jerry Finn Stud drivers US4175453A (en) * 1977-04-22 1979-11-27 Kraftwerk Union Aktiengesellschaft Device for tensioning several screw bolts Cited By (1) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title AU668484B2 (en) * 1993-06-16 1996-05-02 Unex Corporation Mechanical tensioner Also Published As Publication number Publication date CA1256681A (en) 1989-07-04 AU6248986A (en) 1987-03-26 EP0220472A1 (en) 1987-05-06 US4604918A (en) 1986-08-12 Similar Documents Publication Publication Date Title US4556352A (en) 1985-12-03 Shaft-mounted snap lock assembly KR101205990B1 (en) 2012-11-29 Bolt tensioning apparatus and method thereof US5374135A (en) 1994-12-20 Mounting machine with ready transportability US5129136A (en) 1992-07-14 Flange spreader DE7911933U1 (en) 1980-09-11 HYDRAULIC WRENCH AU593280B2 (en) 1990-02-08 Apparatus for tensioning studs US3726370A (en) 1973-04-10 Bidirectional no-back coupling WO1997017562A2 (en) 1997-05-15 Torque tight locking device EP1892060A2 (en) 2008-02-27 Strap wrench US6912768B2 (en) 2005-07-05 Method for locking dual overhead camshafts JPH02221706A (en) 1990-09-04 Hydraulic actuator DE69917734T2 (en) 2005-08-04 rotary joint DE2813841C2 (en) 1990-04-12 US4408927A (en) 1983-10-11 Threaded joint toggle-locked with a helical spring US4062254A (en) 1977-12-13 Device for tightening, prestressing and untightening a threaded joint CA2149232C (en) 1998-07-28 Rod rotating tool EP1307636B1 (en) 2006-04-19 Connection between two shaft ends, positioned coaxially one behind the other, of a gas shuttle valve in an internal combustion engine and a valve actuator US5700122A (en) 1997-12-23 Quick tightening fastener US4343561A (en) 1982-08-10 Slack adjuster DE4401327C1 (en) 1995-04-06 Swash plate machine, especially internal combustion engine DE2914707C2 (en) 1982-06-16 Portable power screwdriver with one-way clutch DE1914332A1 (en) 1970-04-16 Combined adjustment tool WO1996018826A1 (en) 1996-06-20 Turnbuckle spigot assembly DE19019T1 (en) 1983-04-14 DEVICE FOR WRENCH. DE184408C (en)
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