EP0084676B1 - Clé dynamométrique, en particulier pour écrous de roue - Google Patents

Clé dynamométrique, en particulier pour écrous de roue Download PDF

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Publication number
EP0084676B1
EP0084676B1 EP82111999A EP82111999A EP0084676B1 EP 0084676 B1 EP0084676 B1 EP 0084676B1 EP 82111999 A EP82111999 A EP 82111999A EP 82111999 A EP82111999 A EP 82111999A EP 0084676 B1 EP0084676 B1 EP 0084676B1
Authority
EP
European Patent Office
Prior art keywords
torque
torque wrench
housing
signal generator
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
Application number
EP82111999A
Other languages
German (de)
English (en)
Other versions
EP0084676A3 (en
EP0084676A2 (fr
Inventor
Silvio Hosig
Erich Rauch, Jr.
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.)
Elora-Werkzeugfabrik GmbH
Original Assignee
Elora-Werkzeugfabrik GmbH
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 Elora-Werkzeugfabrik GmbH filed Critical Elora-Werkzeugfabrik GmbH
Publication of EP0084676A2 publication Critical patent/EP0084676A2/fr
Publication of EP0084676A3 publication Critical patent/EP0084676A3/de
Application granted granted Critical
Publication of EP0084676B1 publication Critical patent/EP0084676B1/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
    • 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
    • B25B13/02—Spanners; Wrenches with rigid jaws
    • B25B13/06—Spanners; Wrenches with rigid jaws of socket type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/005—Handle constructions for screwdrivers, wrenches or spanners with additional levers, e.g. for increasing torque

Definitions

  • the present invention relates to a torque wrench, in particular for tightening and loosening wheel nuts of a motor vehicle, consisting of a bending rod with a torque indicator rod attached to it on one side, which interacts with an acoustic signal generator arranged on the bending rod in such a way that the latter engages when a predetermined torque is reached emits an acoustic signal.
  • Such a torque wrench is known from FR-A 2397920.
  • This wrench consists of a driver head for key inserts, with which a driver lever is connected in one piece.
  • An extension of the driver lever forms a torque indicator rod, which is arranged between two drive levers with a rectangular cross section.
  • the driver lever or its extension is connected to the two-part drive lever, which forms a bending rod, via a joint.
  • An adjustment slide is longitudinally displaceable, enclosing the extension and the drive lever, mounted on the torque wrench and serves as an adjustment option for the length of the bending rod and thus for the adjustability of the torque to be displayed.
  • On the bending bar i.e. H.
  • a hammer which is pre-tensioned by a coil spring, is provided as a signal transmitter, which interacts with the torque indicator rod. Due to the resilient deformation of the bending rod, the hammer slides with an inclined surface over a stop surface of the torque indicator rod until the hammer hits the end of the torque indicator rod and thus emits a signal noise.
  • this signal noise is relatively quiet, which is why the known wrench is not or only partially suitable for the special application for tightening and loosening wheel nuts of a motor vehicle, since in most cases a wheel change required due to a flat tire must be carried out on the roadside where it is other road users cause noise pollution that makes it difficult to perceive the acoustic signal noise. If the signal is ignored, the respective screw connection is tightened with the wrong torque.
  • the present invention is based on the object of specifying a torque wrench of the generic type which, at a predetermined torque, generates a loud acoustic signal which is also clearly perceptible even when there are noises.
  • the acoustic signal transmitter is surrounded by a housing designed as a resonance body, which has a concavely curved wall part for directional sound reflection and a sound emission opening opposite the wall part.
  • the signal noise generated by the signal transmitter is amplified by the resonance oscillation of the housing and radiated outward.
  • the acoustic signal transmitter is a spring leaf that is pretensioned with a flat curvature to form a membrane, one end of which is clamped in the handle of the bending rod and the free end of which cooperates with a cam arranged on the torque indicator rod.
  • Such a signal generator already generates a signal noise which is much louder than the signal generator known from the prior art and which is further amplified by the housing according to the invention, so that it is practically unmistakable for the user of the torque wrench according to the invention even in the presence of background noise. Further advantageous design features of the invention are contained in the subclaims.
  • the torque wrench according to the invention consists of a bending rod 13 which is rectangular in cross section and a torque indicator rod 22 which is permanently connected to it at one end. As shown in FIG. 1, the bending rod 13 is curved at one end with a handle 33 and at the other, opposite end formed and provided with a plug-on device 15 for receiving a wrench 16, the so-called nut.
  • This push-on device 15 arranged on the bending rod 13 advantageously enables the wrench 16 in use to be easily replaced by a larger or smaller one, as a result of which the area of application of the bending rod 13 according to the invention can be considerably expanded.
  • An acoustic signal transmitter 20 is arranged in the region of the bending rod 13 adjoining the handle 33.
  • the torque indicator rod 22 advantageously consists of a relatively thin flat iron, the width of which corresponds approximately to the width of the bending rod 13.
  • the acoustic signal transmitter 20 is advantageously designed as a spring leaf 28 which is pre-stressed with a flat curvature 36 to form a membrane 43, one end 45 of which is clamped in the handle 33 of the bending rod 13 and the free end 44 of which cooperates with a cam 29 arranged on the torque indicator rod 22.
  • the bending rod 13 In the position shown in FIG. 2, the bending rod 13 is in the unloaded state. With a corresponding load on the bending rod 13, namely when tightening a screw nut, there is between the bending rod 13 and the torque indicator rod 22 a relative movement in the direction of arrow 39.
  • the actuating cam 29 causes the spring leaf 28 clamped at the end 45 to be flexed.
  • the cam 29, which acts on the spring leaf 28 with the finger-shaped extension 48, produces in this contrary to the inner state of tension due to the flat curvature 36 of the membrane 43, a counter-tension increases with increasing deflection of the spring leaf.
  • the curvature 36 designed as a membrane 43 jumps over in the surface of the spring leaf 28 with a spontaneous reduction in tension and thereby produces a sharp bang, similar to a whip or shot bang.
  • the spring leaf 28 assumes the original position and shape again with increasing bending relief, and it likewise springs back into the neutral position with a bang.
  • Such spring membranes used to generate a bang are also known to be used in children's toys under the name "bang-frog”.
  • the advantage of an application to the signal generator 20 of the present invention resides in the fact that the popping noise generated in the manner described is unmistakably loud and that the trigger point for the spring 28 skipping is extremely precisely adjustable.
  • the end 47 of the handle 33 receiving the bending rod is formed into a housing 30 surrounding the signal transmitter 20, 28, 29 and the free end 46 of the torque indicator rod 22, with a guide 42 in the interior of the housing 30 is arranged for clamping the spring leaf 28.
  • the housing 30 is advantageously also designed as a resonance body with a semicircularly curved wall part 38 for directional sound reflection. Opposite this wall part 38 there is a sound emission opening 40, which is advantageously closed with a closure piece 37 through which a large number of small sound emission openings 41 pass.
  • a flange 35 is arranged between the handle 34 of the handle 33 and the housing part 30 of the handle 33.
  • a very advantageous and inexpensive manufacture of the signal transmitter 20 shown in FIGS. 1 to 3 is achieved in that, on the one hand, the spring leaf 28 is clamped into a guide 42 formed in the plastic material of the housing 30 and fastened therein in an uncomplicated manner, and on the other hand the cam 29 is inserted with a guide 29 'with a tight fit on the free end 46 of the torque indicator rod is a molded plastic body which has a finger-shaped extension 48 for acting on the spring leaf 28 of the signal generator 20.
  • the torque wrench designed in accordance with the invention is therefore not only distinguished by its convincingly simple and uncomplicated design and inexpensive to produce, but also, due to its clear and foolproof handling, enables the correct tightening of screw nuts of any shape and size with a precisely specified torque, for everyone.
  • the device is therefore ideally suited as an on-board tool for motor vehicles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Claims (7)

1. Clé à vis à moment de torsion, en particulier pour serrer et desserrer les écrous des roues d'un véhicule, comprenant une tige cambrée (13) sur laquelle est fixée par un côté une tige (22) indiquant le moment de torsion et coopérant avec un émetteur de signaux acoustiques (20) disposé sur la tige cambrée, de manière telle qu'il émette un signal acoustique lorsqu'un moment de torsion prédéterminé est atteint, caractérisée en ce que l'émetteur de signaux acoustiques (20) est entouré d'un boîtier (30) faisant office de corps de résonance et présentant une paroi (38) recourbée de manière concave, afin d'obtenir une réflexion acoustique dirigée et une ouverture (40) située à l'opposé de la paroi (38) et servant à l'émission de sons.
2. Clé à vis à moment de torsion selon la revendication 1, caractérisée en ce que l'émetteur de signaux acoustiques (20) est une lame (28) dont une légère incurvation (36) sous précontrainte forme une membrane (43), une extrémité (45) de cette lame étant enserrée dans la poignée (33) de la tige cambrée (13) et l'extrémité libre (44) coopérant avec une came (29) disposée sur la tige d'indication du moment de torsion (22).
3. Clé à vis à moment de torsion selon la revendication 1 ou 2, caractérisée en ce que le boîtier (30) entourant l'émetteur de signaux (20) est constitué par un prolongement axial de la poignée (33) s'étendant dans la dirction de la tige cambrée.
4. Clé à vis à moment de torsion selon la revendication 2 ou 3, caractérisée en ce qu'à l'intérieur du boîtier (30) il est prévu un dispositif de guidage (42) pour enserrer la lame de ressort (28).
5. Clé à vis à moment de torsion selon l'une ou plusieurs des revendications 1 à 4, caractérisée en ce que la fenêtre d'émission de sons (40) du boîtier (30) peut être fermée par un organe de fermeture (37) présentant une pluralité de petites ouvertures (41) d'émission du son.
6. Clé à vis à moment de torsion selon l'une ou plusieurs des revendications 3 à 5, caractérisée en ce que la poignée (33) présente une collerette (35) entre sa portion (34) servant de poignée et la portion (30) faisant office de boîtier.
7. Clé à vis à moment de torsion selon la revendication 2, caractérisée en ce que la came (29) est un corps moulé en matière synthétique appliqué de manière fixe par son guidage (29') sur l'extrémité libre (46) de la tige d'indication du moment de torsion (22), ce corps possédant un prolongement (48) ayant la forme d'un doigt qui agit sur la lame de ressort (28).
EP82111999A 1982-01-27 1982-12-24 Clé dynamométrique, en particulier pour écrous de roue Expired EP0084676B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH494/82 1982-01-27
CH494/82A CH654783A5 (de) 1982-01-27 1982-01-27 Drehmoment-schraubenschluessel, insbesondere fuer radmuttern.

Publications (3)

Publication Number Publication Date
EP0084676A2 EP0084676A2 (fr) 1983-08-03
EP0084676A3 EP0084676A3 (en) 1984-05-30
EP0084676B1 true EP0084676B1 (fr) 1987-06-03

Family

ID=4188288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111999A Expired EP0084676B1 (fr) 1982-01-27 1982-12-24 Clé dynamométrique, en particulier pour écrous de roue

Country Status (3)

Country Link
EP (1) EP0084676B1 (fr)
CH (1) CH654783A5 (fr)
DE (2) DE3276467D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740466A1 (de) * 1987-11-28 1989-06-08 Man Nutzfahrzeuge Gmbh Radmutterschluessel
DE9201339U1 (de) * 1992-02-04 1992-03-19 Confon Ag, Rheineck Vorrichtung zum Festziehen einer Schraube oder Mutter
DE102018218994A1 (de) * 2018-11-07 2020-05-07 Toge Dübel Gmbh & Co. Kg Werkzeugaufsatz für ein angetriebenes Handwerkzeug, insbesondere für einen Tangential-Schlagschrauber, Anordnung mit einem derartigen Werkzeugaufsatz sowie Verfahren zum Spannen und Lösen einer Befestigungsmutter an einem Gewindestab mittels eines derartigen Werkzeugaufsatzes
US11358269B2 (en) * 2019-09-30 2022-06-14 Raytheon Company Torque enhancing adapter for a hand tool

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2315521A (en) * 1942-01-10 1943-04-06 Charles W Hart Torque wrench
US2628497A (en) * 1948-01-05 1953-02-17 Charles W Hart Torque wrench
JPS5023419Y2 (fr) * 1971-12-04 1975-07-15
FR2209308A5 (fr) * 1972-12-01 1974-06-28 Masson Pere Et Fils
FR2230465A1 (en) * 1973-05-22 1974-12-20 Moulinoux Andre Torque wrench emitting noise at desired torque - lever striking arm is connected by leaf spring carried by arm

Also Published As

Publication number Publication date
DE3276467D1 (en) 1987-07-09
EP0084676A3 (en) 1984-05-30
CH654783A5 (de) 1986-03-14
EP0084676A2 (fr) 1983-08-03
DE8236371U1 (de) 1983-10-20

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