EP1655106A1 - Drehmomentschlüssel und Einrichtung zur Einstellung der Steifigkeit einer Feder - Google Patents

Drehmomentschlüssel und Einrichtung zur Einstellung der Steifigkeit einer Feder Download PDF

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Publication number
EP1655106A1
EP1655106A1 EP04405677A EP04405677A EP1655106A1 EP 1655106 A1 EP1655106 A1 EP 1655106A1 EP 04405677 A EP04405677 A EP 04405677A EP 04405677 A EP04405677 A EP 04405677A EP 1655106 A1 EP1655106 A1 EP 1655106A1
Authority
EP
European Patent Office
Prior art keywords
spring
handle
torque tool
tool according
adjusting member
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Withdrawn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
EP04405677A
Other languages
English (en)
French (fr)
Inventor
Silver Gross
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.)
HADER SA
Original Assignee
HADER SA
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 HADER SA filed Critical HADER SA
Priority to EP04405677A priority Critical patent/EP1655106A1/de
Publication of EP1655106A1 publication Critical patent/EP1655106A1/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Withdrawn legal-status Critical Current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
    • 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 the field of tooling and, more generally, to that of springs. It relates to a dynamometric tool and a device for adjusting the tension of a spring, used in particular in such a tool.
  • dynamometric tools comprise two parts, a head intended to cooperate with an object to train, and a handle to be maintained and apprehended by a user.
  • screw will be used to designate all the objects to be driven, whether of screw or nut type, such as a prosthesis, dental or otherwise, screwed into a part of the body. of the patient.
  • torque wrenches are generally equipped with a locking device mounted inside the head. This device cooperates with a ratchet wheel pivotally mounted in the head and capable of receiving a tool adapted to the screw.
  • the locking device prevents the rotation of the ratchet wheel relative to the head, which allows the driving of the screw. Beyond this torque, if the user continues to tighten the screw, the locking device no longer secures the ratchet wheel and the head, and the key no longer causes the screw.
  • the keys are generally provided with a spring housed in the handle of the tool and acting on the locking device.
  • This spring is put in prestressing, with the help of a rod of adjustment mounted movable inside the handle and pressing on him.
  • a key is well known to those skilled in the art, the applicant is currently marketing one of this type.
  • One of the aims of the invention is to provide a dynamometric tool that makes it possible to achieve high maximum tightening torques without requiring effort on the part of the user.
  • Another more particular object of the invention is therefore to propose a dynamometric tool whose mechanism is particularly simple and comprises only a minimum of functional blocks to be disassembled for sterilization.
  • the tool further comprises a movable adjusting member relative to the spring and intended to make integral with the handle at least one coil of the spring to modulate the number of active turns.
  • the adjusting member is formed of a rod movably mounted inside the spring by screwing.
  • the rod is threaded and its pitch is adapted to that of the turns of the spring.
  • the adjusting member is formed of a sleeve mounted to move inside the handle by screwing on the spring.
  • the adjusting member is formed of an index having a slot and the handle is traversed by openings perpendicular to its longitudinal axis.
  • the invention also relates to the device for adjusting the tension of the spring, for itself.
  • the spring comprises a plurality of turns and is disposed in a housing. It further comprises an adjusting member movable relative to the spring and intended to make the housing integral with at least one turn of the spring to modulate the number of active turns.
  • the figures show a torque wrench 10 having a handle 12, inside which is housed a coil spring 14. The latter presses on a shoulder 17 of a skewer 16 so as to press the latter against a mounted locking device 18 rocker inside a head 20 disposed at one end of the handle 12.
  • the locking device 18 is well known to those skilled in the art and therefore will not be described further. It comes to cooperate with a ratchet wheel 22 pivotally mounted in the head 20 and capable of receiving a tool adapted to the object to be screwed.
  • a movable adjusting member relative to the spring 14 is positioned in the handle and acts on the spring to modulate the number of active turns and thus adjust its elastic force.
  • Active turns will be defined as those that contribute to the force exerted by the spring. Those that are rendered insensitive to external action are said to be passive.
  • the adjusting member is constituted by a rod 24 mounted movably within said spring 14 by screwing.
  • the rod 24 is threaded and its pitch is adapted to that of the turns of the spring 14, whose interior has the function of a tapped hole. It is introduced into the handle 12 by the end opposite the head 20.
  • the outer diameter of the spring 14 is adjusted to the inner diameter of the handle 12, so as to ensure proper positioning of the spring.
  • the end of the wedge 26 in contact with the turns is beveled and serves as a stop while preventing it from pivoting to the inside the handle 12.
  • the free end of the rod 24 is provided with a ridged ring 28 to allow the user to screw it easily into the handle.
  • the rod 24 being more or less engaged in the spring 14, the turns thereof which served for screwing are integral with the rod and are thus made passive. Only the turns still free are active and help to support the shank 16 on the locking member 18.
  • the adjusting member is constituted by a bushing 30 mounted movably inside the handle 12 by screwing on the spring 14.
  • the bushing 30 is threaded and its pitch is adapted to that of the turns of the spring 14. It is introduced into the handle 12 by the end opposite the head 20.
  • the outer diameter of the sleeve 30 is adjusted to the inner diameter of the handle 12, so that it is well guided.
  • the adjusting member consists of an index finger 34, in the form of a nail provided with a flat head 36 and a tip 37 whose end is with a slot 38.
  • the index finger is plugged into openings 40 passing through the handle 12 perpendicular to its longitudinal axis.
  • Each opening 40 is arranged at regular intervals on the handle 12, at a turn of the spring 14, when the latter is at rest. More precisely, a first side of the opening is free, while the turn occupies its second side.
  • the length of the tip of the nail is substantially equal to the outside diameter of the handle 12 and its diameter is adjusted so that it is clipped into an opening 40.
  • the index finger 34 is stuck by the first side of an opening 40, the end of the tip is flush with the wall of the handle on the other side of this opening, while the turn at this level is housed in the slot 38.
  • the outer diameter of the spring 14 is adjusted to the inner diameter of the handle 12, so that it is well maintained.
  • a shim 42 fixed, for example by screwing, in the free end of the handle 12 serves as a stop for the spring 14.
  • the index 34 and clipped makes integral with the handle the turn housed in the slot 38. In this way, only the portion of the spring between the shoulder 17 and the index 34 is active.
  • the nail 34 can then be engaged in one or the other of the openings 40 so as to vary the active length of the spring and thus modulate the maximum tightening torque.
  • modulations are of course discontinuous, but it allows, by calibrating the position of the openings 40 for a given type of spring, to perfectly define the clamping value obtained.
  • a torque wrench is obtained in which the adjustment member makes a number of turns of the spring 14 passive, with an effort negligible and constant user, regardless of the stiffness of the spring 14. This allows to use strong springs and set maximum torque peak values, the limits being only those of materials used and dimensions of the key 10 to withstand the mechanical stresses generated.
  • the invention has other advantages over the keys of the prior art. Indeed, when the key is not used, the spring 14 is in the rest position and undergoes no stress. The durability of the tool is improved.
  • the elements to be disassembled to perform sterilization are few, since it is only necessary to remove the adjustment member by unscrewing (first and second embodiments) or unclipping (third embodiment) and optionally the 26 or 42, to be able to extract the skew 16 and the spring 14.
  • the present description does not limit the application of the invention to the keys and tools of the medical field. Of course, it can be adapted to all dynamometric tools used in mechanics, implementing even more powerful springs.
  • the spring tension adjustment devices described above can be taken up and adapted to various mechanisms using a spring which simply wants to adjust the hardness.
  • spring dampers used in suspension forks for cycles can benefit from such a device.
  • the first and second embodiments above are particularly suitable for this application, the engagement of the rod 24 or the sleeve 30 being modulated by the rotation of a wheel located outside the fork legs and which causes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
EP04405677A 2004-11-04 2004-11-04 Drehmomentschlüssel und Einrichtung zur Einstellung der Steifigkeit einer Feder Withdrawn EP1655106A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04405677A EP1655106A1 (de) 2004-11-04 2004-11-04 Drehmomentschlüssel und Einrichtung zur Einstellung der Steifigkeit einer Feder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04405677A EP1655106A1 (de) 2004-11-04 2004-11-04 Drehmomentschlüssel und Einrichtung zur Einstellung der Steifigkeit einer Feder

Publications (1)

Publication Number Publication Date
EP1655106A1 true EP1655106A1 (de) 2006-05-10

Family

ID=34932345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04405677A Withdrawn EP1655106A1 (de) 2004-11-04 2004-11-04 Drehmomentschlüssel und Einrichtung zur Einstellung der Steifigkeit einer Feder

Country Status (1)

Country Link
EP (1) EP1655106A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8327740B2 (en) 2007-06-01 2012-12-11 Elos Pinol A/S Torque wrench, handle and head piece
CN109551411A (zh) * 2019-01-14 2019-04-02 中国电子科技集团公司第三十八研究所 一种具有调节手柄的力矩扳手

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE894639C (de) * 1951-12-20 1953-10-26 Hellmuth Kuhnke In ihrer Laenge oder Spannung justierbare Schraubenfeder, vorzugsweise als Rueckholfeder fuer Relaisanker
DE2935300A1 (de) * 1978-09-06 1980-03-20 Houdaille Lelaurain Sa Radaufhaengung fuer fahrzeuge
US4517848A (en) * 1982-04-01 1985-05-21 Compagnie Generale Des Etablissements Michelin Apparatus for measuring forces
DE3609437A1 (de) * 1986-03-20 1987-09-24 Vdo Schindling Anordnung zur einstellung der federkonstanten einer schraubenfeder
DE19614246C1 (de) * 1996-04-10 1997-09-04 Daimler Benz Ag Vorrichtung mit zwei druckfedergekoppelten Bauteilen
US20020040628A1 (en) * 2000-10-05 2002-04-11 The Stanley Works Torque wrench
US6471197B1 (en) * 1999-04-09 2002-10-29 Denk Engineering Gmbh Spring device for shock absorber with adjuster
DE20308838U1 (de) * 2003-06-05 2003-08-14 Chou Cheng Ming Verstellbares Spiralfedergehäuse

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE894639C (de) * 1951-12-20 1953-10-26 Hellmuth Kuhnke In ihrer Laenge oder Spannung justierbare Schraubenfeder, vorzugsweise als Rueckholfeder fuer Relaisanker
DE2935300A1 (de) * 1978-09-06 1980-03-20 Houdaille Lelaurain Sa Radaufhaengung fuer fahrzeuge
US4517848A (en) * 1982-04-01 1985-05-21 Compagnie Generale Des Etablissements Michelin Apparatus for measuring forces
DE3609437A1 (de) * 1986-03-20 1987-09-24 Vdo Schindling Anordnung zur einstellung der federkonstanten einer schraubenfeder
DE19614246C1 (de) * 1996-04-10 1997-09-04 Daimler Benz Ag Vorrichtung mit zwei druckfedergekoppelten Bauteilen
US6471197B1 (en) * 1999-04-09 2002-10-29 Denk Engineering Gmbh Spring device for shock absorber with adjuster
US20020040628A1 (en) * 2000-10-05 2002-04-11 The Stanley Works Torque wrench
DE20308838U1 (de) * 2003-06-05 2003-08-14 Chou Cheng Ming Verstellbares Spiralfedergehäuse

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8327740B2 (en) 2007-06-01 2012-12-11 Elos Pinol A/S Torque wrench, handle and head piece
CN109551411A (zh) * 2019-01-14 2019-04-02 中国电子科技集团公司第三十八研究所 一种具有调节手柄的力矩扳手

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