EP0623425B1 - Clé motorisée - Google Patents

Clé motorisée Download PDF

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Publication number
EP0623425B1
EP0623425B1 EP94106933A EP94106933A EP0623425B1 EP 0623425 B1 EP0623425 B1 EP 0623425B1 EP 94106933 A EP94106933 A EP 94106933A EP 94106933 A EP94106933 A EP 94106933A EP 0623425 B1 EP0623425 B1 EP 0623425B1
Authority
EP
European Patent Office
Prior art keywords
housing
cylinder sleeve
cylinder
power wrench
wrench according
Prior art date
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.)
Expired - Lifetime
Application number
EP94106933A
Other languages
German (de)
English (en)
Other versions
EP0623425A1 (fr
Inventor
Paul-Heinz Wagner
Klaus Rüssmann
Thomas Beyert
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0623425A1 publication Critical patent/EP0623425A1/fr
Application granted granted Critical
Publication of EP0623425B1 publication Critical patent/EP0623425B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston

Definitions

  • the invention relates to a pressure-operated power wrench which contains a cylinder sleeve in a housing, a piston being displaceable in the cylinder sleeve and driving a ring piece back and forth via a rotatably mounted lever.
  • a power wrench known from DE 41 11 631 A1 has a housing which consists of a head part and a drive part.
  • the drive part contains an exchangeable cylinder sleeve which is inserted from the outside, that is to say from the side facing away from the head part, into a corresponding bore in the drive part and is supported at the inner end of the bore.
  • Hose connections for supplying the pressure medium to the cylinder liner are laterally projecting at the front end of the drive part. These hose connections include a high-pressure connection that goes through with the rear cylinder space a hole is connected. This bore runs in the longitudinal direction through the housing and it is connected to a transverse bore opening into the cylinder space.
  • On the rear area of the drive part of the housing an external toothing is provided, on which a support foot for deriving the reaction forces arising during screwing from the housing can be placed on a stationary abutment.
  • a power wrench with the features of the preamble of claim 1 is known from EP-A-0 276 936.
  • the cylinder liner is fastened in a housing which is open in the rear area, so that the cylinder liner is not covered here.
  • a pressure channel runs along the cylinder liner and connects a hose connection to the front cylinder space through which the piston rod passes.
  • This pressure channel is connected to the unpressurized hose connection during a working stroke of the piston and to the pressure connection during a return stroke of the piston.
  • the return stroke of the piston usually takes place at a pressure which is considerably less than the pressure which is generated in the rear cylinder space during the working stroke. Therefore, the pressure resistance of the pressure channel is not subject to high demands.
  • DE-A-36 20 753 describes a power wrench in which the cylinder liner consists of an inner cylinder part and a surrounding sealing liner.
  • a helical groove is provided on the outside of the cylinder part, which forms a pressure channel which connects the one hose connection to the front cylinder space.
  • the pressure channel only becomes one during the return stroke Exposed to pressure. This pressure is much lower than the working pressure.
  • the invention has for its object to provide a power wrench with a cylinder sleeve arranged in the housing, in which the security against bursting is increased.
  • the invention is based on the idea that when screwing with high forces, the drive part of the housing is subjected to extremely high loads. These loads result on the one hand from the mechanical stress of the drive part on bending and torsion and on the other hand from the hydraulic stress due to the high pressure of the order of about 600 to 800 bar, which occurs in the pressure channel leading from the hose connection to the rear cylinder chamber. As a result of this mechanical and hydraulic double load, cracks can occur in the drive part of the housing in the prior art. The risk of cracking or material breakage is avoided by the invention in that the drive part of the housing is solid over its length.
  • the pressure channel running in the longitudinal direction of the housing does not lead through the Through the housing wall, but as a longitudinal bore through the wall of the cylinder liner, which is surrounded by the housing.
  • the drive part of the housing therefore only takes on the mechanical stress for deriving the reaction forces that arise during screwing onto a stationary abutment, while the hydraulic stress is only taken over by the cylinder liner.
  • the hydraulic load is composed of the pressure in the rear cylinder space required to advance the piston and the supply pressure in the pressure channel.
  • the cylinder liner has such a strength that it can withstand the hydraulic pressures without significant deformation. It therefore forms an independent cylinder that is only held in position by the housing.
  • the pressure channel runs through the wall of this cylinder.
  • the surrounding housing still holds the parts of the cylinder liner together, so that no fragments fly into the environment and can lead to damage and injuries.
  • the housing can be made thinner than in the case where the pressure channel runs through the housing wall in the longitudinal direction of the housing. In particular, it is also avoided that the pressure channel extends in the vicinity of the external toothing of the housing, to which the support foot is attached, and causes material weakening there.
  • Another advantage is that the production of the power wrench is simplified because the attachment of the pressure channel to the cylinder liner is easier than to the housing, which is a complex molded part.
  • the 1 has a one-piece housing 10, which consists of a head part 11 and a drive part 12.
  • the head part 11 has a working space 13 which is delimited by two parallel plate-shaped walls.
  • the ring part 14 is rotatably mounted in these walls.
  • the ring part 14 contains an opening with a profile toothing 15, into which the shaft of a socket can be inserted, which is placed on the screw head to be rotated.
  • a lever 17 is mounted on the ring part 14 and has a spring-loaded ratchet element 18, which can engage with a locking toothing 19 of the ring part.
  • the ratchet element 18 is arranged and supported on the lever 17 in such a way that the lever 17 only takes the ring part 14 along in one direction of rotation, but can be moved back in the other direction of rotation without driving the ring part in rotation.
  • the cylinder sleeve 21 is arranged in a bore 20.
  • the housing opening 22, from which the cylinder sleeve 21 is inserted into the housing, is located on the outer end of the drive part 12 facing away from the head part 11.
  • This opening 22 is provided with a thread into which a cover 23 is screwed.
  • the cover 23 has on its outside bores 24 into which a tool for rotating the cover can be used. Similar bores 25 are located on the outside of the base 26 of the cylinder liner 21. This base 26 is supported on the cover 23.
  • the cylinder sleeve 21 is also provided at its rear end, which faces away from the head part 11, with an external thread 27 which extends approximately over half the length of the cylinder sleeve and is screwed into an internal thread in the bore 20.
  • the cylinder sleeve 21 forms the hydraulic cylinder in which the piston 28 is displaceable.
  • the piston 28 is designed here as a spherical piston which can assume different pivoting positions in the cylinder liner while maintaining the seal to the cylinder wall.
  • the piston rod 29 is rigidly attached to this piston 28.
  • At the end of the piston rod 29 there is a spherical head 30 which sits in a spherical bearing 31 of the lever 17.
  • a latching device 32 in the form of a clamping spring arrangement is provided on this bearing 31, which engages around the head 30 and thus holds it in the bearing 31. When the head 30 is pressed against the lever 17, the locking device 32 is pressed apart to close behind the head 30 again and thus to hold the head in the bearing 31.
  • an auxiliary piston 33 is provided in the cylinder liner for the return stroke.
  • This auxiliary piston 33 has a cylindrical piston surface so that it cannot be tilted.
  • a sleeve 34 protrudes from the auxiliary piston 33 in the direction of the working space 13.
  • a seal 37 is provided which surrounds the sleeve 34 and seals the front cylinder space 35.
  • the front cylinder space 35 is delimited by the auxiliary piston 33 and the rear cylinder space 36 by the piston 28 and the base 26.
  • connection device 40 On the front area of the drive part 12, which adjoins the head part 11, a connection device 40 is attached to which pressure hoses can be connected.
  • This connection device 40 has a first hose connection 41 and a second hose connection 42.
  • the first hose connection 41 serves as a high-pressure connection, to which the full operating pressure of 600 to 800 bar is supplied, and the second hose connection 42 is a low-pressure connection, to which a considerably lower pressure is supplied for the resetting of the pistons 28 and 33.
  • the hose connection 41 is connected to a transverse bore 43 which passes through the wall of the housing 10 and opens into the bore 20.
  • a radial blind bore 44 is provided in the cylinder bushing 21, which is followed by a longitudinal bore 45 running inside the wall of the cylinder bushing.
  • the longitudinal bore 45 is closed with a stopper 46.
  • the cylinder bore of the cylinder liner 21 has an extension 47 in the form of an undercut at its rear end on. This extension 47 extends into the longitudinal bore 45 and connects it to the rear cylinder space 36.
  • the blind bore 44 is located at the bottom of a circumferential groove 48 of the cylinder liner. From this circumferential groove 48 extends a further blind bore 44a and a further longitudinal bore 45a to the extension 47. Since the volume of the pressure channel is distributed over several longitudinal bores 45, 45a, these longitudinal bores can have a relatively small cross section, with the result that the through the wall forces generated remain low.
  • Seals 49 and 49a are provided on both sides of the annular groove 48.
  • the hose connection 42 is connected to a transverse bore 50 which opens into the bore 20 in front of the front end of the cylinder liner.
  • a cover 51 is arranged there, which supports the front end of the cylinder bushing 21 and has radial passages 52. The cover 51 also serves to center the sleeve 34.
  • the latter is provided on the outside with a spline 54 on which a ring of a support foot (not shown) with a counter toothing can be placed.
  • This support foot is placed against a stationary abutment to derive the reaction forces generated during screwing.
  • high bending and torsional moments can therefore occur on the drive part.
  • the drive part must be designed according to this load. In the area the spline 54, however, no hydraulic pressure acts on the drive part of the housing. Rather, this hydraulic pressure is absorbed by the cylinder liner 21.
  • a working stroke is carried out by pressurizing the line 41 while the line 42 is depressurized.
  • the piston 28 is pushed forward by the pressure in the cylinder chamber 36, the piston rod 29 pressing against the lever 17 and the ring piece 14 rotating via the ratchet element 18.
  • the piston 28 pushes the auxiliary piston 33 in front of it.
  • line 42 is pressurized, while line 41 is depressurized.
  • the auxiliary piston 33 is driven by the pressure in the cylinder chamber 35, driving the piston 28 into the rear end position.
  • the ratchet lever 114 is mounted coaxially to the ring piece 111, which contains a movable driver 115, which in a External teeth 116 of the ring piece 111 engages.
  • the ratchet shoe 115 is supported with a joint ball 117 in a ball socket of the ratchet lever 114 and is pressed in the direction of the ring piece 111 by a spring 118.
  • the working cylinder 112 consists of a one-piece cylinder body 120, in which the cylinder bore 121 is designed as a blind hole. This blind hole is delimited at the rear end by the bottom wall 122 which is integrally formed on the cylinder body.
  • the front end of the cylinder body 120 is closed by a plug 123 which is screwed into a thread of the cylinder body.
  • the plug 123 is sealed with a seal 124 against the cylinder bore 121. It contains a passage 125 for the piston rod. This passage 125 contains a seal 126.
  • the piston 127 is axially movable in the cylinder bore 121.
  • This piston has a piston rod 128 rigidly attached to it, which projects through the passage 125 of the plug 123.
  • the front end of the piston rod 128 is designed as a spherical head 129, which sits in a ball socket 130 of the ratchet lever 114.
  • a pin 131 passes through the head 29 which holds the head 129 to the ratchet lever 114 and causes the ratchet lever 114 to follow the retracting movement of the piston 127. During the working stroke, the pin 131 does not cause any significant power transmission.
  • the bottom wall 122 of the cylinder body 120 is formed with an outwardly directed spherical cap 132, which sits in a spherical bearing shell of a bearing 133.
  • the bearing 133 is in the rear end wall of the housing 110 screwed in.
  • a screw 134 passes through a bore in the bearing 133 and is screwed into a thread of the crest 132 and engages with its head on an annular shoulder 135 of the bearing 133. Between the screw head and the ring shoulder 135 there is an elastic ring 136 which allows pivoting movements of the screw 134 relative to the bearing 133.
  • a connecting piece 137 protrudes laterally from the front region of the cylinder body 120. This connecting piece 137 protrudes through an opening 138 of the housing 110 with play. Bores 139, 140 run through the connecting piece 137. The bore 139 communicates with the front cylinder space 141 and the bore 140 communicates with the rear cylinder space 142. Hose connections (not shown) are provided on the connecting piece 137 in order to connect external hoses to the bores 139 and 140.
  • the cylinder body 112 is contained in the housing 110 in a space 143 which is large enough to allow pivoting movements of the cylinder body around the center of the dome 132. Such pivoting movements occur during the reciprocating movement of the piston 127 in that the ratchet lever 114 is pivoted about the axis of the ring piece 111 and the piston rod 128 must follow the pivoting movements of the ratchet lever 114.
  • the piston-cylinder unit consisting of the cylinder 112 and the piston 127 with piston rod 128 is rigid in the transverse direction and adapts overall to pivoting movements of the ratchet lever 114. Characterized in that both ends of the piston-cylinder unit are spherically supported and the piston-cylinder unit is rigid in itself, no lateral guidance of the cylinder is required.
  • the cylinder space 142 is pressurized, while the cylinder space 141 is depressurized.
  • the piston 127 is then advanced and pushes the ratchet lever 114 forward.
  • the screw head is taken along via the ring piece 111.
  • the return stroke then takes place, in which the cylinder space 141 is pressurized, while the cylinder space 142 is depressurized.
  • the piston 127 moves into the rear end position.
  • the cylinder 112 is held on the housing 110 by the screw 134 and the ratchet lever 114 is pivoted back, the driver 115 sliding over the toothing 116 of the ring piece 111.
  • the support leg 144 is provided on the housing.
  • This support foot has a ring 145 which surrounds the rear housing section.
  • This housing section has a polygonal profile (e.g. hexagonal profile) on the outside, to which the inner profile of the ring 145 is adapted.
  • the ring 145 can therefore be placed in different rotational positions on the rear housing section.
  • An arm 146 projects laterally from the ring 145.
  • the connecting piece 137 is arranged on the front region of the working cylinder 112, the connecting piece 137 does not hinder the support foot 144.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Braking Systems And Boosters (AREA)
  • Valve Device For Special Equipments (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Claims (10)

  1. Visseuse motorisée comportant un carter (10), qui comprend une partie de tête (11) avec un élément annulaire (14) logé en rotation et un levier (17) logé en rotation, qui est destiné à entraîner l'élément annulaire, ainsi qu'un élément d'entraînement (12) qui comporte une douille cylindrique (21) et un piston (28) pouvant se déplacer dans cette dernière, dont la tige (29) de piston agit sur le levier (17), dans laquelle au moins un raccord de flexible (41) est prévu sur l'élément d'entraînement (12), et un canal de pression s'étendant dans la direction longitudinale de l'élément d'entraînement (12), qui fait partie intégrante de la douille cylindrique (21) et qui relie le raccord de flexible (41) à une chambre cylindrique (36) de la douille cylindrique (21),
       caractérisée en ce que le raccord de flexible (41) est disposé latéralement sur l'élément d'entraînement (12), et que le canal de pression est un perçage longitudinal (45) qui s'étend dans la paroi de la douille cylindrique (21), et relie le raccord de flexible (41) à la chambre cylindrique (36) arrière.
  2. Visseuse motorisée selon la revendication 1, caractérisée en ce qu'il est prévu au moins deux perçages longitudinaux (45, 45a) qui, au niveau de l'extrémité avant de la douille cylindrique (21), sont reliés à une rainure annulaire (48) circonférentielle extérieure, et qui débouchent dans la chambre cylindrique (36) arrière.
  3. Visseuse motorisée selon l'une des revendications 1 ou 2, caractérisée en ce qu'il est prévu un autre raccord de flexible (42), qui est relié à un perçage transversal (50) du carter (10) et qui débouche à l'intérieur du carter dans la zone située à l'avant de la douille cylindrique (21).
  4. Visseuse motorisée selon la revendication 3, caractérisée en ce qu'un couvercle (51) est prévu dans la zone dans laquelle le perçage transversal (50) débouche à l'intérieur du carter, qui supporte axialement la douille cylindrique (21), qui comporte un passage radial (52), et qui centre une douille (34) pouvant être déplacée avec le piston (28).
  5. Visseuse motorisée selon l'une des revendications 1 à 4, caractérisée en ce que la douille cylindrique (21) comporte dans sa moitié arrière un filetage extérieur (27), qui est vissé dans le carter (10).
  6. Visseuse motorisée selon l'une des revendications 1 à 5, caractérisée en ce que la douille cylindrique (120) est mise en appui de façon à pouvoir pivoter dans le carter (100), et que la douille cylindrique (120) comporte un perçage borgne (121) qui est obturé par un bouchon (123), ce dernier comportant un passage étanche (125) destiné à la tige (128) du piston (127).
  7. Visseuse motorisée selon la revendication 6, caractérisée en ce que, dans la zone avant située au voisinage du bouchon (123), la douille cylindrique (120) comporte une tubulure de raccordement (137) dépassant latéralement, qui traverse un orifice (138) du carter (110).
  8. Visseuse motorisée selon l'une des revendications 1 à 7, caractérisée en ce que la partie du carter (110) contenant la douille cylindrique (120) a un profil polygonal ou un profil d'arbre cannelé, sur lequel peut être emboîté le support annulaire (145) d'un pied de support (144).
  9. Visseuse motorisée selon la revendication 6, caractérisée en ce que la paroi de fond (122) de la douille cylindrique est logée de façon sphérique dans le carter (110).
  10. Visseuse motorisée selon l'une des revendications 1 à 9, caractérisée en ce que l'extrémité avant de la tige (128) de piston est logée de façon sphérique dans le levier (114).
EP94106933A 1993-05-06 1994-05-04 Clé motorisée Expired - Lifetime EP0623425B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE9306871U 1993-05-06
DE9306871 1993-05-06
DE9405697U 1994-04-06
DE9405697U DE9405697U1 (de) 1993-05-06 1994-04-06 Kraftschrauber

Publications (2)

Publication Number Publication Date
EP0623425A1 EP0623425A1 (fr) 1994-11-09
EP0623425B1 true EP0623425B1 (fr) 1997-08-27

Family

ID=25960825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94106933A Expired - Lifetime EP0623425B1 (fr) 1993-05-06 1994-05-04 Clé motorisée

Country Status (4)

Country Link
US (1) US5495782A (fr)
EP (1) EP0623425B1 (fr)
JP (1) JPH06320436A (fr)
DE (2) DE9405697U1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7875440B2 (en) * 1998-05-01 2011-01-25 Arizona Board Of Regents Method of determining the nucleotide sequence of oligonucleotides and DNA molecules
US6546839B1 (en) * 2000-08-22 2003-04-15 Titantechnologies International, Inc. Flow regulation device
GB2370246B (en) * 2000-11-21 2004-06-23 Weatherford Lamb Power tong frames
US7451672B2 (en) * 2006-01-11 2008-11-18 Jetyd Corp. Link attachment to torque wrench
US7765895B2 (en) * 2007-10-29 2010-08-03 Junkers John K Fluid-operated torque wrench for and method of tightening or loosening fasteners
CN103192341A (zh) * 2013-03-28 2013-07-10 马鞍山市三江机械有限公司 一种驱动式液压扳手
CN104552098A (zh) * 2014-12-10 2015-04-29 马鞍山市益华液压机具有限公司 中空液压扳手
CN106378741A (zh) * 2016-11-05 2017-02-08 陕西东方航空仪表有限责任公司 液压扭矩扳手
CN116997438A (zh) * 2022-01-21 2023-11-03 凯特克分部尤尼克斯公司 用于拧紧螺纹紧固件的装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8319734U1 (de) * 1983-07-08 1983-11-03 Wagner, Paul-Heinz, 5203 Much Kraftschrauber
DE3413202A1 (de) * 1984-04-07 1985-10-17 Wagner, Paul-Heinz, 5203 Much Kraftschrauber
DE3620753A1 (de) * 1986-03-15 1987-09-17 Wagner Paul Heinz Hydraulischer kraftschrauber
US4794825A (en) * 1986-11-03 1989-01-03 Atlantic-Caribbean Products, Inc. Hydraulic power wrench
GB8701194D0 (en) * 1987-01-20 1987-02-25 Hedley Purvis Ltd Torque wrenches
DE3719893A1 (de) * 1987-06-13 1988-12-29 Wagner Paul Heinz Hydraulischer kraftschrauber
USRE33951E (en) * 1987-09-29 1992-06-09 Fluid operated wrench
US5263388A (en) * 1991-04-10 1993-11-23 Paul-Heinz Wagner Power wrench
DE4111631A1 (de) * 1991-04-10 1992-10-15 Wagner Paul Heinz Kraftschrauber
US5301574A (en) * 1993-03-02 1994-04-12 Bolttech Inc. Hydraulic wrench

Also Published As

Publication number Publication date
US5495782A (en) 1996-03-05
DE9405697U1 (de) 1994-07-14
JPH06320436A (ja) 1994-11-22
EP0623425A1 (fr) 1994-11-09
DE59403831D1 (de) 1997-10-02

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