EP0324050A1 - Kraftschrauber - Google Patents

Kraftschrauber Download PDF

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Publication number
EP0324050A1
EP0324050A1 EP88106443A EP88106443A EP0324050A1 EP 0324050 A1 EP0324050 A1 EP 0324050A1 EP 88106443 A EP88106443 A EP 88106443A EP 88106443 A EP88106443 A EP 88106443A EP 0324050 A1 EP0324050 A1 EP 0324050A1
Authority
EP
European Patent Office
Prior art keywords
torque wrench
engaging means
engaging
threaded connector
power
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.)
Withdrawn
Application number
EP88106443A
Other languages
English (en)
French (fr)
Inventor
John K. Junkers
Wilhelm F. Krautter
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.)
Unex Corp
Original Assignee
Unex Corp
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 Unex Corp filed Critical Unex Corp
Publication of EP0324050A1 publication Critical patent/EP0324050A1/de
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the present invention relates to a torque wrench for applying or releasing a load on a threaded connectors during its tightening and loosening.
  • Torque wrenches of the above mentioned general type for threaded connectors such as nuts, bolts, etc.
  • a known torque wrench includes fluid operated means arranged in a housing of the wrench, drive means actuatable by the fluid operate means, and engaging means which is driven by the drive means and engage a threaded connector for tightening and loosening the same.
  • a reaction force is produced which tends to move a housing of the wrench in an opposite direction.
  • the reaction members are known in a variety of constructions.
  • a torque wrench which comprises a power means, means actuated by the power means and having first engaging means arranged to engage and to act on one part of a threaded connector and second engaging means arranged to engage and to act on another part of the threaded connector, so that during turning of one part of a threaded connector by the first engaging means the second engaging means cooperate with the other part of the threaded connector.
  • the second engaging means can absorb a reaction force created in the other part of the threaded connector during turning of the one part, or even turn the other part in a direction which is opposite to the direction of turning of the one part of the threaded connector.
  • the torque wrench When the torque wrench is designed in accordance with the present invention, it has a simple construction and at the same time a reaction force created during turning of one part of a threaded connector is reliably absorbed by the other part of the threaded connector without creating side loads or bending forces on the other part of the threaded connector.
  • the torque wrench is used for tightening of a nut arranged on a bolt, the reaction force created during tightening of the nut is taken up by the bolt, or the bolt can be turned in opposite direction.
  • a torque wrench in accordance with the present invention has a housing which is identified with reference numberal 1.
  • the torque wrench has drive means which is identified with reference numeral 2, and power means identified with reference numberal 2′ and arranged in the housing 1.
  • the drive means 2 in the embodiment of FIGS. 1 and 2 includes supporting plates 3 each having an opening and arranged so that a ratchet wheel 4 is turnably supported in the opening of the supporting plates 3. It is to be understood that only one supporting plate can also be provided in the wrench.
  • the supporting plates are connected with the housing 1 by pins 5. More particularly, they are connected to additional plates 6 which are fixedly connected with the housing, for example by welding.
  • the drive means further includes a driving link 7 which is turnable about an axle 8.
  • the driving link 7 carries a pawl 9.
  • the pawl 9 is engaged with the ratchet wheel 4 in a known fashion, for example by interengagement of their respective teeth or other formations.
  • the power means 2′ includes two fluid-operated single-­acting cylinder-piston units located at opposite sides of the driving lever 7 so as to cooperate with its portion provided above the piston axle 8.
  • Each cylinder-piston unit has a cylinder 10 formed by a part of the housing 1, and a piston 11 receiprocatingly movable in the cylinder 10.
  • the torque wrench in accordance with the present invention is provided with a reaction member 15.
  • the reaction member is an elongated member which is firmly connected with the housing 1 on its one end, for example by the pins 5 which connect the supporting plate 3 with the housing.
  • the torque wrench is used for tightening or loosening the nut 13 which is arranged on the bolt 14.
  • the torque wrench in accordance with the present invention is provided with two engaging means for engaging respective parts of a threaded connector.
  • First engaging means is formed by an engaging opening 4′ which is provided in the ratchet 4 and in which for example a nut 13 arranged on a bolt 14 can be received.
  • Second engaging means is formed by a free end of the reaction member 15 which is located near a part of the threaded connector which is turnably connected with the part to be tightened or loosened,. In the shown embodiment, the free end of the reaction member 15 is located near the head of the bolt 14.
  • the torque wrench or more particularly the ratchet 4 is fitted with its engaging opening 4′ on the nut 13 which is arranged on the bolt 14.
  • the free end of the reaction member 15 is then placed near the head of the bolt 14.
  • one of the cylinder-piston units of the power means is actuated, it turns the driving lever 7 together with the pawl 9 in one direction, whereby the pawl 9 turns the ratchet 4 in the same one direction, so that the ratchet turns the nut for its tightening.
  • the free end of the reaction member 15 firmly engages the head of the bolt 14 and therefore the bolt 14 takes up a reaction force which is closed during turning of the nut 13.
  • the free end of the reaction member 15 which cooperates with the bolt 14 can be formed as a flat part which plainly abuts against the bolt. On the other hand, it can be provided with an opening through which the head of the bolt 14 extends. It is to be understood that it can also be provided with other formations cooperating with the bolt.
  • FIG. 3 shows a torque wrench in accordance with a somewhat different embodiment of the invention.
  • the second engaging means is provided in one of the plates, namely the plate 3′ which is formed to cooperate with a part of the threaded connector, which is turnably connected with a part to be tightened or loosened.
  • the supporting plate 3′ has a free end which plainly abuts against the head of the bolt 14 or has an opening through which the head of the bolt 14 extends.
  • the shape of the opening in the supporting plate 3′ can exactly correspond to the shape of the head of the bolt 14, for example can be hexagonal, square, splined, etc. The same is true with respect to the opening provided in the free end of the reaction member 15 in the embodiment of FIG. 2.
  • FIG. 3 eliminates the reaction member and decreases the overall height of the driving link.
  • the torque wrench in accordance with this embodiment is self-contained unit.
  • FIG. 4 shows power means 2 ⁇ which is formed in accordance with a further embodiment. While the fluid-­power means 2′ in the embodiment of FIG. 1 includes two single-acting fluid-operated cylinder-piston units, the power means 2 ⁇ of FIG. 4 has only one fluid-operated cylinder-­piston unit.
  • This cylinder-piston unit is double-acting and has a cylinder 16 and a piston 17 reciprocatedly movable in the cylinder. During displacement of the piston 17 in opposite directions, it displaces the driving link 7 through an engaging element 18 in respective two directions.
  • the power means of the inventive torque wrench can be provided with only one single-acting cylinder-piston unitwhich has a spring return.
  • the cylinder-piston unit displaces the driving link 7 in one direction to perform positive tightening or loosening, and then the spring unit moves the driving link in an opposite direction.
  • FIG. 5 shows a further embodiment of the present invention.
  • the torque wrench has power means 20.
  • the tool further has two drive means 21 and 22 connected with the power means.
  • the drive means are provided with engaging means 23 and 24 formed for example as engaging openings which are arranged to engage a nut and a bolt head of a threaded connector respectively.
  • Both drive means can be provided with ratchet mechanisms. It is also possible that only one of the driving means is provided with the ratchet mechanism, or both driving means do not have ratchets at all. In the latter case the tool would have to be reset after each stroke. In this construction when one part of the threaded connector is turned by the engaging means of one driving means, the engaging means of the other driving means hold the other part of the threaded connector, or even turn it in an opposite direction.
  • FIG. 6 shows a further modification of the embodiment of FIG. 5.
  • the second drive means 22′ is removable mounted for example on a part 25 connected with the power means 20, by pins 26.
  • the second drive means 22′ can therefore be arranged at any side of the first driving means 21 for applying as well as releasing a bolt load.
  • FIG. 7 shows still a further embodiment of the inventive torque wrench.
  • the tool has power means 30 which can be formed as a pneumatic, a hydraulic or an electric motor.
  • Drive means 31 includes a housing with a not shown gear transmission in it.
  • the drive means 31 is connected with engaging members 32 and 33 each having a polygonal shape.
  • the housing of the drive means 31 is fixedly connected with the engaging member 32, while the not shown gear transmission is fixedly connected with the engaging member 33.
  • Reference numerals 34 and 35 identify two sockets which have polygonal inner openings.
  • the socket 34 with the engaging member 33 form first engaging means, while the socket 35 with the engaging member 32 form second engaging means.
  • the inner shape of the socket 34 is such that it corresponds to the outer shape of the engaging member 33 and a bolt head 36.
  • the inner shape of the socket 35 is such that it corresponds to the outer shape of the engaging member 32 and a nut 37.
  • the actuation of the power means 30 results in turning of the bolt head 36 while the nut 37 remains stationary, or turning of the nut 37 while the bolt head 33 remains stationary, or turning of the nut 37 and the bolt head 36 in opposite directions.
  • the bolt head and the nut can be turned without the motor, but instead by applying a manual force through a multiplier.
  • the tool can be made without the drive unit 31, but instead with direct connection of the motor 30 with engaging members which directly engage the nut and the bolt head. If the nut is turned and the bolt unit remains stationary, the reaction force is actually doing the turning, and in this case the entire unit turns.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP88106443A 1988-01-14 1988-04-22 Kraftschrauber Withdrawn EP0324050A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14457788A 1988-01-14 1988-01-14
US144577 1993-10-27

Publications (1)

Publication Number Publication Date
EP0324050A1 true EP0324050A1 (de) 1989-07-19

Family

ID=22509205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106443A Withdrawn EP0324050A1 (de) 1988-01-14 1988-04-22 Kraftschrauber

Country Status (3)

Country Link
EP (1) EP0324050A1 (de)
JP (1) JPH01183375A (de)
DE (1) DE8807386U1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563821A1 (de) * 1992-03-31 1993-10-06 Wagner, Paul-Heinz Druckmittelbetätigter Kraftschrauber
DE4210511A1 (de) * 1992-03-31 1993-10-07 Wagner Paul Heinz Druckmittelbetätigter Kraftschrauber
EP1325794A1 (de) * 2002-01-04 2003-07-09 Unex Corporation Hydraulisch betriebener Drehmomentschlüssel
US8499853B2 (en) * 2009-11-16 2013-08-06 Norwolf Tool Works, Inc. Apparatus and methods for controlling hydraulically powered equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8902659D0 (en) * 1989-02-07 1989-03-30 Hedley Purvis Ltd Improved hydraulic torque wrench

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB161080A (en) * 1920-05-07 1921-04-07 Carl Evenson Improvements in and relating to bolting up devices
DE2626923A1 (de) * 1976-06-16 1977-12-29 Mock Geraetebau Gmbh & Co Kg Vorrichtung zum anziehen und loesen von schraube-mutter-verbindungen
DE3013116A1 (de) * 1980-04-03 1981-10-08 Weck, Manfred, Prof. Dr.-Ing., 5100 Aachen Vorrichtung zum anziehen und loesen von schraubverbindungen sowie hierfuer geeigneter schraubenbolzen
DE3230141A1 (de) * 1982-08-13 1984-02-16 Daimler-Benz Ag, 7000 Stuttgart Ratschenschrauber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB161080A (en) * 1920-05-07 1921-04-07 Carl Evenson Improvements in and relating to bolting up devices
DE2626923A1 (de) * 1976-06-16 1977-12-29 Mock Geraetebau Gmbh & Co Kg Vorrichtung zum anziehen und loesen von schraube-mutter-verbindungen
DE3013116A1 (de) * 1980-04-03 1981-10-08 Weck, Manfred, Prof. Dr.-Ing., 5100 Aachen Vorrichtung zum anziehen und loesen von schraubverbindungen sowie hierfuer geeigneter schraubenbolzen
DE3230141A1 (de) * 1982-08-13 1984-02-16 Daimler-Benz Ag, 7000 Stuttgart Ratschenschrauber

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563821A1 (de) * 1992-03-31 1993-10-06 Wagner, Paul-Heinz Druckmittelbetätigter Kraftschrauber
DE4210511A1 (de) * 1992-03-31 1993-10-07 Wagner Paul Heinz Druckmittelbetätigter Kraftschrauber
EP1325794A1 (de) * 2002-01-04 2003-07-09 Unex Corporation Hydraulisch betriebener Drehmomentschlüssel
US6802235B2 (en) 2002-01-04 2004-10-12 Unex Corporation Fluid-operated torque wrench
US8499853B2 (en) * 2009-11-16 2013-08-06 Norwolf Tool Works, Inc. Apparatus and methods for controlling hydraulically powered equipment

Also Published As

Publication number Publication date
DE8807386U1 (de) 1988-09-29
JPH01183375A (ja) 1989-07-21

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