US3869941A - Torque wrench - Google Patents

Torque wrench Download PDF

Info

Publication number
US3869941A
US3869941A US472369A US47236974A US3869941A US 3869941 A US3869941 A US 3869941A US 472369 A US472369 A US 472369A US 47236974 A US47236974 A US 47236974A US 3869941 A US3869941 A US 3869941A
Authority
US
United States
Prior art keywords
rod
head
slide rod
head rod
torque
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 - Lifetime
Application number
US472369A
Other languages
English (en)
Inventor
Hiroshi Tsuji
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.)
Tohnichi Mfg Co Ltd
Original Assignee
Tohnichi Mfg Co Ltd
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 Tohnichi Mfg Co Ltd filed Critical Tohnichi Mfg Co Ltd
Application granted granted Critical
Publication of US3869941A publication Critical patent/US3869941A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

  • ABSTRACT Preset type torque wrench capable of tightening a screw at a predetermined torque set therein.
  • the wrench has a head rod secured to the torque applying head and a slide rod arranged in parallel to the head rod.
  • a pair of toggle links are provided adjacent to the opposite ends of the slide rod and each pivotally connected to the head rod and the slide rod.
  • a compression spring is interposed between the head rod and the slide rod so as to urge the head rod and the slide rod in the opposite directions lengthwise thereof.
  • the present invention relates to improvements in a preset type torque wrench capable of tightening a screw at a predetermined torque manually or by a driving motor.
  • a preset type torque wrench as described above is provided therein a mechanism generating a sound or a tactile impression when the tightening reaches a predetermined torque so that the operator is aware of the completion oftightening by the sound or the tactile impression.
  • Various types have been utilized for this mechanism.
  • One of the most conventional types of this mechanism is that in which a toggle link mechanism is used.
  • the other object is to provide a preset type torque wrench of the type described above in which the mechanism for presetting the torque is arranged within the handle of the torque wrench to which the force is applied.
  • a torque wrench having a head rod secured to the torque applying head of the wrench, a slide rod arranged in parallel to the head rod, a pair of toggle links arranged adjacent to the opposite ends of the slide rod and each pivotally connected to the head rod and the slide rod, and a spring interposed between the head rod and the slide rod so as to urge the head rod and the slide rod in the opposite directions lengthwise thereof.
  • the length of one of the toggle links is made different from that of the other toggle link while the toggle setting angle between one of the toggle links and the head rod is made correspondingly different from that between the other toggle link and the head rod.
  • the actual torque of the torque wrench for tightening the screw is made constant regardless of the position at which the force is applied to the torque wrench.
  • FIG. 1 is a plan view, partly in cross-section, showing the internal construction of an example of the prior art torque wrench
  • FIGS. 2 and 3 are side views showing the general configurations of some examples of the prior art torque wrench
  • FIG, 4 is a fragmentary sectional view, with the torque applying head being omitted, showing the main portions of an embodiment of the torque wrench constructed in accordance with the present invention
  • FIG. 5 is a fragmentary sectional view similar to FIG. 4 but showing the manner of operation of the torque wrench shown in FIG. 4;
  • FIG. 6 is a schematic diagram showing the relationship between various components of the forces applied to the torque wrench shown in FIG. 4.
  • the torque applying head 1 of the torque wrench is pivotally supported by a head pin 3 to the tube 2 serving as the handle of the torque wrench.
  • the inner end of the head 1 is pivotally connected to one end of the toggle line 5, the opposite end of which is pivotally connected to one end of the slide rod 6 having a roller adapted to slidably contact with the inner wall of the tube 2.
  • the opposite end of the slide rod 6 is attached to a member slidable in the tube 2 and contacting with one end of a compression spring 4 housed in the tube with the opposite end secured by an adjustable member adjustably secured to the tube 2 so as to urge the slide rod 6 toward the head 1 with a force F.
  • the toggle link 5 is positioned at an angle a with respect to the vertical line, so that the roller of the slide rod 6 is slidably urged against theinner wall of the tube 2 by the force F.
  • T P lh r.F.cot 01 plied, i.e., the value I, varies, thereby making it difficult to maintain the torque to be applied to the screw at a desired constant value exactly, because it is difficult in the actual practice to keep the value of l constant.
  • the length lh will be considerably large in case when the top end of the head is bent as shown in FIG. 2, or in case when the head portion includes a power device as shown in FIG. 3, so that only small change of the portion I to which the force is given will cause a large change of the working torque T.
  • the present invention avoids the above described disadvantage of the prior art torque wrench and provides a torque wrench in which the torque to be applied to the screw is always kept accurately at a desired predetermined value regardless of the point at which the force is applied to the torque wrench and the torque limiting mechanism is housed in the handle of the torque wrench to which the force is applied.
  • a head member 10 for applying a torque to a screw is fixedly secured to a head rod 11.
  • a slide rod 12 is arranged in parallel to the head rod 11 as shown.
  • a pair of toggle links 13, 14 are provided adjacent to the opposite ends of the slide rod 12 and each pivotally connected at its opposite ends to the head rod 11 and slide rod 12, respectively, the links l3, 14 being oriented obliquely with respect to the length of the head rod 11 as shown.
  • a compression spring 15 is interposed between the head rod 11 and the slide rod 12 with its one end secured to a portion of the slide rod 12 adjacent to the pivot point of the link 13 while the other end of the spring 15 is held by a member, which is mounted on an adjusting screw threadedly engaged with a portion of the head rod 11 adjacent to the pivot point of the link 14, so that the compressive force of the spring 15 is made adjustable by rotating the adjusting screw 20.
  • a stopper 16 is secured to the head rod 11 as shown, while rollers 19 are provided adjacent to the opposite ends of the slide rod 12.
  • a tube-like cover 17 is swingably connected to a portion of the head rod 11 exterior of the cover 17 through a connecting link 18 as shown, and the remaining portion of the head rod 11, the slide rod 12 and the spring 15 as well as'the links 13, 14 are housed in the cover 17.
  • the stopper 16 of the head rod 11 abuts against the inner wall of the cover 17 at one side thereof while the rollers 19 are urged to slidably contact with the inner wall of the cover 17 at its opposite side along the generating line of the inner wall of the cover 17 by virtue of the action of the spring 15 and the oblique orientation of the links 13, 14.
  • the force P is applied to the slide rod 12 during the operation and, when the torque T reaches a predetermined value, the toggle links 13, 14 are actuated so as to engage the head rod 11 with the slide rod 12 against the force F of the spring 15 the value of which is adjustable.
  • the angle or is generally greater than the angle :1 with the length a of the toggle lever 13 being smaller than the length a of the toggle link 14, and the head rod 11 is moved substantially in the translational movement parallel to the slide rod 12 (FIG. 5), thereby affording convenient tactile impression while the spring is conveniently arranged between the rods 11, 12.
  • deviation in the torque T might occur, when the force P is applied obliquely as the force P with an angle 0 formed between the perpendicular to the cover 17 and the direction of the force P, because a horizontal component P-sin 6 of the force P directly affects the force F of the spring 15.
  • the slide rod 12 is provided with rollers 19 freely slidable along the inner wall of the cover 17.
  • the head rod 11 is moved to urge the slide rod 12 along the inner wall of the cover 17 by the free rolling of the rollers 19 of the slide rod 12 thereby permitting only the vertical component of the force P to be transmitted to the torque wrench even though the force P is applied in the direction obliquely of the perpendicular to the cover 17 without causing any deviation in the torque T.
  • the position at which the force is applied to the torque wrench for tightening the screw can be selected at any position in the wide range of the handle cover without causing any errors in the torque to be applied to the screw, thereby permitting accurate tightening effect to the obtained.
  • Preset type torque wrench having a toggle mechanism therein, wherein the improvement comprises a head rod secured to the torque applying head of said wrench, a slide rod arranged in parallel to said head rod, two pairs of toggle links arranged in spaced relationship from each other lengthwise of said head rod and said slide rod adjacent to the opposite ends of said slide rod and each pivotally connected to said head rod and said slide rod, and a spring interposed between said head rod and said slide rod and connected thereto.
  • Torque wrench according to claim 1 wherein the length of one of said toggle links forming said pair is set to be different from that of the other of said toggle links while the toggle setting angle formed between said one of said toggle links and said head rod as well as said slide rod is set to be correspondingly different from that formed between said other of said toggle links and said head rod as well as said slide rod.
  • Torque wrench according to claim 1 wherein said slide rod is arranged within a tubular handle slidably along the generating line of said handle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US472369A 1973-08-29 1974-05-22 Torque wrench Expired - Lifetime US3869941A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48097029A JPS5136520B2 (enrdf_load_stackoverflow) 1973-08-29 1973-08-29

Publications (1)

Publication Number Publication Date
US3869941A true US3869941A (en) 1975-03-11

Family

ID=14181015

Family Applications (1)

Application Number Title Priority Date Filing Date
US472369A Expired - Lifetime US3869941A (en) 1973-08-29 1974-05-22 Torque wrench

Country Status (5)

Country Link
US (1) US3869941A (enrdf_load_stackoverflow)
JP (1) JPS5136520B2 (enrdf_load_stackoverflow)
FR (1) FR2242202B1 (enrdf_load_stackoverflow)
GB (1) GB1446379A (enrdf_load_stackoverflow)
SE (1) SE416277B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4602538A (en) * 1984-05-26 1986-07-29 Eduard Wille Gmbh & Co. One-armed torque wrench
US20100170370A1 (en) * 2007-06-18 2010-07-08 Tohnichi Mfg. Co., Ltd Torque tool device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615948B1 (fr) * 1987-05-27 1989-10-27 Sam Outillage Cle dynamometrique electronique
JP6333077B2 (ja) * 2014-06-09 2018-05-30 株式会社東日製作所 トルクレンチ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2268081A (en) * 1939-04-11 1941-12-30 Pagnard Georges Frederic Tightening device
US2556587A (en) * 1947-03-20 1951-06-12 Keen Frank Leslie Torque wrench with overload release means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2268081A (en) * 1939-04-11 1941-12-30 Pagnard Georges Frederic Tightening device
US2556587A (en) * 1947-03-20 1951-06-12 Keen Frank Leslie Torque wrench with overload release means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4602538A (en) * 1984-05-26 1986-07-29 Eduard Wille Gmbh & Co. One-armed torque wrench
US20100170370A1 (en) * 2007-06-18 2010-07-08 Tohnichi Mfg. Co., Ltd Torque tool device
US8485049B2 (en) * 2007-06-18 2013-07-16 Tohnichi Mfg. Co., Ltd. Torque tool device

Also Published As

Publication number Publication date
FR2242202B1 (enrdf_load_stackoverflow) 1977-10-07
FR2242202A1 (enrdf_load_stackoverflow) 1975-03-28
SE7409077L (enrdf_load_stackoverflow) 1975-03-03
SE416277B (sv) 1980-12-15
DE2441064A1 (de) 1975-03-06
GB1446379A (en) 1976-08-18
JPS5136520B2 (enrdf_load_stackoverflow) 1976-10-08
JPS5045397A (enrdf_load_stackoverflow) 1975-04-23
DE2441064B2 (de) 1976-04-08

Similar Documents

Publication Publication Date Title
US2420020A (en) Lever-actuated pivoted-jaw wrench
US2949947A (en) Straight beam adjustable jaw clamp
US3496808A (en) Toggle link type hand tool
US2792733A (en) Pre-set torque indicating wrench
US2562060A (en) Slidable side jaw socket wrench
US3869941A (en) Torque wrench
US2205501A (en) Safety wrench
US3132548A (en) Pre-set torque release wrench
US3742786A (en) Torque spanners
US3180128A (en) Crimping tool
GB588870A (en) Improvements in wrenches
EP0162992B1 (de) Einarmiger Drehmomentschlüssel
US2600617A (en) Adjustable crowfoot wrench
US2990738A (en) Parallel vise
US1576918A (en) Wrench
US2855964A (en) Quick-acting clamp
US3000245A (en) Pivoted head, slidable side jaw wrench having ratchet-type actuating means
US2703976A (en) Calibration apparatus for torque wrenches and cable tensiometers
US2920665A (en) Clamping device with selectively yieldable or non-yieldable pressure means
US2639637A (en) Gear actuated predetermined torque release wrench
GB767401A (en) Improvements in or relating to an adjustable wrench
US2679777A (en) Predetermined torque release wrench
US3357285A (en) Wrenches
US2255320A (en) Clamp
US3546933A (en) Force indicating device