EP0040231B1 - Pipe wrench - Google Patents

Pipe wrench Download PDF

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Publication number
EP0040231B1
EP0040231B1 EP80902284A EP80902284A EP0040231B1 EP 0040231 B1 EP0040231 B1 EP 0040231B1 EP 80902284 A EP80902284 A EP 80902284A EP 80902284 A EP80902284 A EP 80902284A EP 0040231 B1 EP0040231 B1 EP 0040231B1
Authority
EP
European Patent Office
Prior art keywords
involute
pipe
jaw
wrench
contact surface
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
Application number
EP80902284A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0040231A1 (en
Inventor
Egon Salting Larsen
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.)
LARSEN Egon Salting
Original Assignee
LARSEN Egon Salting
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 LARSEN Egon Salting filed Critical LARSEN Egon Salting
Priority to AT80902284T priority Critical patent/ATE8218T1/de
Publication of EP0040231A1 publication Critical patent/EP0040231A1/en
Application granted granted Critical
Publication of EP0040231B1 publication Critical patent/EP0040231B1/en
Expired 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
    • B25B13/00—Spanners; Wrenches
    • B25B13/10—Spanners; Wrenches with adjustable jaws
    • B25B13/28—Spanners; Wrenches with adjustable jaws the jaws being pivotally movable
    • B25B13/32—Spanners; Wrenches with adjustable jaws the jaws being pivotally movable by cam, wedge or lever
    • 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
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B25B13/50—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes
    • B25B13/5008—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes for operating on pipes or cylindrical objects
    • B25B13/5016—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes for operating on pipes or cylindrical objects by externally gripping the pipe
    • B25B13/5025—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes for operating on pipes or cylindrical objects by externally gripping the pipe using a pipe wrench type tool
    • B25B13/5041—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes for operating on pipes or cylindrical objects by externally gripping the pipe using a pipe wrench type tool with movable or adjustable jaws
    • B25B13/505—Pivotally moving or adjustable

Definitions

  • the present invention consists in a pipe wrench for gripping a pipe at three circumferentially spaced points which wrench consists of a pivotable jaw including two inclined gripping faces to grip the pipe at two points and which is pivoted to a handle having a jaw part with an involute contact surface intended to grip the pipe at the third point, characterized in that
  • the wrench consists of a shank with an involute, possibly toothed, jaw a and a loose jaw b pivotally connected hereto.
  • the curved contact surface of the jaw a is an involute generated from a circle c centred on the pivot axis between the jaws a and b, and the toothed gripping surfaces on the jaw b are inclined to each other at 60° so that the points of contact with pipes shown in Figure 1 and Figure 2 are at 120° spacing.
  • the line 1 represents a plane bisecting the angle between the gripping surfaces of the jaw b.
  • the positions of the gripping surfaces on the jaw b in relation to the pivot axis of the jaw a, and the involute curve of the contact surface on a jaw a are so chosen that the point of contact between the contact surface and the pipe always lies on the line 1, thus establishing the third point of contact at 120° spacing from each of the other points.
  • the point of contact can be moved a small distance Ar tangentially in the direction of rotation by the centre of rotation of the loose jaw part being moved the small distance Ar closer to 1.
  • the wrench works in the way that pipes or parts inserted between its jaws are firmly fixed between these when the handle is pulled, and they are at the same time actuated by a turning movement.
  • the normal force K between pipe and jaw is determined by the moment of the shank and the moment arm r which is the same for all pipe diameters as a result of the involute design.
  • the wrench will also be suitable for hexagonal parts, and as mentioned in the foregoing the point of contact and hence the line of application of the force K can be moved a distance Ar tangentially in the direction of rotation which, when Ar is small, does not change the fact to any considerable degree that parts are actuated at three points at 120° intervals since, in actual practice, these "points" are faces of a size of a few millimetres.
  • the wrench can be provided with adjustment facilities since a possible shifting in the direction on line 1 on the loose jaw of its axis of rotation will extend the diameter range covered by the wrench.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Shearing Machines (AREA)
EP80902284A 1979-11-20 1980-11-20 Pipe wrench Expired EP0040231B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80902284T ATE8218T1 (de) 1979-11-20 1980-11-20 Rohrzange.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK4930/79 1979-11-20
DK493079 1979-11-20

Publications (2)

Publication Number Publication Date
EP0040231A1 EP0040231A1 (en) 1981-11-25
EP0040231B1 true EP0040231B1 (en) 1984-07-04

Family

ID=8137949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80902284A Expired EP0040231B1 (en) 1979-11-20 1980-11-20 Pipe wrench

Country Status (4)

Country Link
EP (1) EP0040231B1 (OSRAM)
JP (1) JPS56501639A (OSRAM)
DE (1) DE3068462D1 (OSRAM)
WO (1) WO1981001385A1 (OSRAM)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK473586A (da) * 1986-10-03 1988-04-04 Axel Groenlund Nielsen Selvspaendende tang
DK473686A (da) * 1986-10-03 1988-04-04 Axel Groenlund Nielsen Fremgangsmaade til fremstilling af selvspaendende tang
CA2069265A1 (en) * 1991-08-26 1993-02-27 Young S. Woo Pipe wrench
US20060174730A1 (en) * 2003-03-02 2006-08-10 Stewart Denis L Wrench improvment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191401874A (en) * 1914-01-23 1914-06-11 Jean-Jacques-Marie-Marce Bales Egg Chocolate.
GB191501904A (en) * 1915-02-06 1915-12-30 Thomas Richardson An Adaptable Fire Front to Replace Bars of Register Grates and the like.
GB191501863A (en) * 1915-02-05 1916-02-07 Martin Thomas Taylor Improvements in connection with Rock Drills and the like.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US600494A (en) * 1898-03-08 Pipe-wrench
DE173725C (OSRAM) *
GB190413621A (en) * 1904-06-16 1904-07-21 Joseph Levy Improvements in Ratchet Pipe-Wrenches.
GB201784A (en) * 1922-08-23 1923-08-09 Ernest Edward Cullen Improvements in or relating to pipe wrenches
CH155546A (de) * 1931-08-22 1932-06-30 Schlichtherle Rietmann Joseph Rohrzange.
GB684240A (en) * 1949-10-18 1952-12-17 John Henry Edgar Davis Improvements in wrenches

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191401874A (en) * 1914-01-23 1914-06-11 Jean-Jacques-Marie-Marce Bales Egg Chocolate.
GB191501863A (en) * 1915-02-05 1916-02-07 Martin Thomas Taylor Improvements in connection with Rock Drills and the like.
GB191501904A (en) * 1915-02-06 1915-12-30 Thomas Richardson An Adaptable Fire Front to Replace Bars of Register Grates and the like.

Also Published As

Publication number Publication date
WO1981001385A1 (en) 1981-05-28
DE3068462D1 (en) 1984-08-09
EP0040231A1 (en) 1981-11-25
JPS56501639A (OSRAM) 1981-11-12

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