EP0077346B1 - Cle dite "a couple ou dynamometrique a declenchement, pseudo-debrayage, et rearmement automatique" - Google Patents

Cle dite "a couple ou dynamometrique a declenchement, pseudo-debrayage, et rearmement automatique" Download PDF

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Publication number
EP0077346B1
EP0077346B1 EP19820901132 EP82901132A EP0077346B1 EP 0077346 B1 EP0077346 B1 EP 0077346B1 EP 19820901132 EP19820901132 EP 19820901132 EP 82901132 A EP82901132 A EP 82901132A EP 0077346 B1 EP0077346 B1 EP 0077346B1
Authority
EP
European Patent Office
Prior art keywords
cam
handle
extremity
spring strip
fact
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
EP19820901132
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0077346A1 (fr
Inventor
Flavien Nordet
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
Priority to AT82901132T priority Critical patent/ATE22672T1/de
Publication of EP0077346A1 publication Critical patent/EP0077346A1/fr
Application granted granted Critical
Publication of EP0077346B1 publication Critical patent/EP0077346B1/fr
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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1427—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by mechanical means

Definitions

  • the present invention relates to hand tools of the “dynamometric wrench” type enabling bolting or screwing of mechanical assemblies to a recommended torque. This proceeds from the predetermined deformation of a spring.
  • the amplitude of deformation of the spring, obtained with each stress, is constant.
  • the torque variation effects are proportional to the length of spring subject to deformation after adjustment.
  • the invention relates to a hand torque wrench, with automatic triggering and rearming, reversible, allowing tightening and loosening of the mechanical bolts comprising; a pivoting handle during operation around the axis with a triggering device comprising a cam integral with the body of the tool and a rocker arm oscillating around an axis integral with the handle, this rocker arm being retained at one end forming notch by the beak of the cam, characterized in that it further comprises a shock-absorbing block consisting of a steel block secured to the handle at its rear end, a force-absorbing spring leaf extending along the body and the handle in contact with the shock absorber block in its rest position at its rear end and at V5 of its length starting from its rear end with a friction roller crimped in the rocker arm at its end opposite to that retained by the beak of the cam in that the cam being made integral with the body by the action of a part of a spring pressing the end of the cam on
  • the key is equipped with a force receiving spring constituted by a straight leaf spring, of rectangular section, of constant width, but thick, decreasing allowing a better staggering of the graduations.
  • the torque wrench being equipped with 3 assorted sets composed of 3 leaf springs of different thicknesses associated one by one with a fixing band and a slider adapted to the 3 different thicknesses of leaf spring, these 3 sets being removable, allows with a single mount whose vernier is engraved with 3 parallel scales to cover a wide range of performances.
  • the translation generated by the rotation to the left or to the right of the adjusting screw varies the height of the cam spout allowing the calibration of the leaf springs according to the graduations of the body, and the subsequent recalibration of the key. depending on wear.
  • the device combines with the automatic resetting system, a simple pseudo-declutching device which allows safely for the operator's hand (without untimely slippage) greater tightening speed, greatly limiting the risk of exceeding the imposed torque. This improvement brings the appreciable double advantage of saving time and reducing the nervous tension of the user.
  • a receiving spring As a receiving spring, it employs a straight blade of great length (the size adopted allows precision and longevity) of rectangular section, of constant width but of decreasing thickness along a slope calculated so that the staggering of the vernier graduations traversed by the slider, that is to say closer to an arithmetic progression, than that obtained using a blade of constant section (graphical representation board 2/2) hence greater clamping precision in the area of heavy loads.
  • the spring fixing hoop (9), the slider (10) and the leaf spring (8) of which it is advisable to have a set of different thicknesses, it allows with a single frame ensuring a very wide range of tightening values (ranging from 0, 200 kg to 12 kg for example).
  • An adjustment screw (which can, if necessary, be made inviolable by the means existing for carburetor jets for example) allows the tool to be recalibrated according to wear.
  • this reversible tool ensures both right tightening and left tightening. He is precise and faithful. Its construction is simple (reduced number of components and large adjustment tolerances). His reduced head and slim body allow him the best access.
  • the leaf spring (8) releases part of the accumulated force by pushing back the rocker arm (3) through its point of contact with the roller (13), and its return effect is stopped at its free end by the shock absorber block (4).
  • the resulting shock constitutes the expected tactile and auditory signal.
  • the leaf spring (8) supports a residual tension lower than the nominal torque displayed since its free length increased while its torsion decreased. Consequently, the body (1) of the tool retains its angular position, while even carried away by its momentum, the operator's hand only accentuates the rotational movement of the handle (5).
  • This subsidiary effect is limited by the rise in tension of the leaf spring (8) and, at the end of the stroke, by the contact of the safety stop with the body (1) of the tool. It is during this period that the physiological reflex intervenes to interrupt the tightening action.
  • the released handle (5) is then pushed back to its starting position by the reaction of the free end of the leaf spring (8) on the damping block (4).
  • the rocker arm (3) also maintained by it, in the initial position, that is to say in support by its roller (13) and the base of its beak clears in passing the beak (12) of the cam (2) which slides in its buttonhole (15), compresses its return spring (6) and finally comes back out under its plane of contact with the spout (14) of the rocker arm (3).
  • the return movement of the handle (5) is stopped at this instant by the contact of the stop which is integral with the corresponding notch milled in the body (1) of the tool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP19820901132 1981-04-27 1982-04-27 Cle dite "a couple ou dynamometrique a declenchement, pseudo-debrayage, et rearmement automatique" Expired EP0077346B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82901132T ATE22672T1 (de) 1981-04-27 1982-04-27 Sogenannter drehmoment- oder dynamometrischer schluessel mit automatischer ausschaltung, pseudo- auskupplung und wiederbekraeftigung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8108506A FR2504436A1 (fr) 1981-04-27 1981-04-27 Cle dite a " couple ou dynamometrique, a declenchement, pseudo-debrayage, et rearmement automatique "
FR8108506 1981-04-27

Publications (2)

Publication Number Publication Date
EP0077346A1 EP0077346A1 (fr) 1983-04-27
EP0077346B1 true EP0077346B1 (fr) 1986-10-08

Family

ID=9257881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820901132 Expired EP0077346B1 (fr) 1981-04-27 1982-04-27 Cle dite "a couple ou dynamometrique a declenchement, pseudo-debrayage, et rearmement automatique"

Country Status (4)

Country Link
EP (1) EP0077346B1 (enrdf_load_stackoverflow)
DE (1) DE3273614D1 (enrdf_load_stackoverflow)
FR (1) FR2504436A1 (enrdf_load_stackoverflow)
WO (1) WO1982003816A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2730943B1 (fr) * 1995-02-24 1997-05-23 Facom Cle dynamometrique a rearmement automatique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1234972A (fr) * 1958-10-17 1960-07-01 Clé dynamométrique
FR1510105A (fr) * 1966-12-06 1968-01-19 Forges Stephanoises Sa Des Déclencheur à réarmement automatique pour clé dynamométrique
US3847038A (en) * 1971-07-26 1974-11-12 Snap On Tools Corp Automatic release wrench of the preset type
FR2250308A7 (enrdf_load_stackoverflow) * 1973-07-05 1975-05-30 Wille Eduard

Also Published As

Publication number Publication date
FR2504436B1 (enrdf_load_stackoverflow) 1984-07-13
DE3273614D1 (en) 1986-11-13
WO1982003816A1 (en) 1982-11-11
EP0077346A1 (fr) 1983-04-27
FR2504436A1 (fr) 1982-10-29

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