US3701295A - Torque wrench - Google Patents

Torque wrench Download PDF

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Publication number
US3701295A
US3701295A US111841A US3701295DA US3701295A US 3701295 A US3701295 A US 3701295A US 111841 A US111841 A US 111841A US 3701295D A US3701295D A US 3701295DA US 3701295 A US3701295 A US 3701295A
Authority
US
United States
Prior art keywords
trough
shaped springs
handle member
tightening
torque wrench
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
US111841A
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English (en)
Inventor
Shirou Mende
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.)
Nakamura Seisakusho KK
Original Assignee
Nakamura Seisakusho KK
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 Nakamura Seisakusho KK filed Critical Nakamura Seisakusho KK
Application granted granted Critical
Publication of US3701295A publication Critical patent/US3701295A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • This invention relates to a torque wrench for tightening a bolt, nut or the like with a predetermined torque, and has for its primary object the provision of a torque wrench which is very simple in construction and can be produced at a low cost.
  • a further object of the invention is to provide a torque wrench which enables a predetermined tightening torque to be maintained constant at all times, irrespectively of a positional change of the force applied to a handle member of the torque wrench.
  • a torque wrench in which a tightening member and a handle member are connected with each other by means of a pair of spaced trough-shaped springs arranged with the concaved surfaces thereof confronting each other.
  • FIG. 1 is a front elevation, partially shown in section, of an embodiment of the torque wrench according to the present invention
  • FIG. 2 is a front elevation showing the manner of using the torque wrench of FIG. 1;
  • FIG. 3 is a cross section taken along the line IIIIII of FIG. 1;
  • FIG. 4 is a graph showing the relationship between the load P and the deflection 8 of the spring when a pair of the opposed trough-shaped springs are fixed at one end and the load P is applied to the other end.
  • the torque wrench of the invention comprises a tightening member 2 and a handle member 3, and the tighten ing member 2 has a spanner head 5 formed with an opening 4 engageable with a bolt head or a nut to be tightened, and a spanner shank 6.
  • the handle member 3 includes an inner sleeve 8 having an enlarged open end 7, and a grip 9 covering said inner sleeve 8.
  • An insert block 10 is slide-fittedin the sleeve8 and secured therein by means of a fixing pin 11 at a portion adjacent the enlarged open end 7.
  • a pair of spaced troughshaped springs l2, 12, each having an arcuate transverse cross section, are arranged in opposed parallel relation with their concaved surfaces confronting each other.
  • the spanner shank 6 and the insert block 10 have formed in the confronting end faces thereof arcuate slots 13, 13 and 14, 14 respectively, which are complementary to the arcuate cross-sectional shapes of the trough-shaped springs 12, 12.
  • the trough-shaped springs l2, 12 have one of their ends inserted into the arcuate slots 13, 13 of the spanner shank 6 and at the other end inserted into the arcuate slots 14, 14 of the insert block 10, and secured therein as by screws or welding, thereby to connect the tightening member 2 and the handle member 3 with each other. It will be obviously understood that the securement of the troughshaped springs 12, 12 to the spannershank 6 and the insert block 10 may be achieved by directly securing the ends of the former to the latter as by welding or screws.
  • the opening 4 of the spanner head 5 is engaged with the bolt head or nut 15 and the handle member 3 is turned in a clockwise direction, as-shown in FIG. 2, to tighten said bolt head or nut 15.
  • the tightening torque is small, the trough-shaped springs 12, 12 are not deflected and the tightening force applied to the handle member 3 is transmitted to the tightening member 2 through said trough-shaped springs l2, 12.
  • the trough-shaped springs l2, 12 are deflected and the handle member 3 is angularly displaced relative to the axis of the tightening member 2.
  • FIG. 4 shows the relationship between the bending load P and the deflection 8 of a pair of the troughshaped springs connecting the tightening member and the handle member with each other.
  • the trough-shaped springs have such a characteristic that they deflect increasingly in proportion to the increasing bending load exerted thereon and are subjected to buckling at the maximum load P
  • the angular displacement of the handle member to the tightening member suddenly increases namely the handle member pivots relative to the tightening member to release the tightening torque. Therefore, it is possible to positively tighten a'bolt, a nut or the like with a predetermined torque.
  • the tightening member and the handle member are connected by way of the trough-shaped springs, the predetermined tightening torque will not change, no matter to what position the acting point of the force applied to the handle member may be shifted on said handle member.
  • a torque wrench comprising, in combination, a tightening member, a handle member and a spring mechanism, said spring mechanism consisting of a pair of spaced trough-shaped springs arranged with their concave surfaces facing each other, each of said springs being affixed at one of its ends to the tightening member and at the other of its ends to the handle member, said trough-shaped springs having the characteristic of deflecting increasingly in proportion to an increasing bending load and buckling at a load corresponding to a predetermined maximum torque of the wrench, said spring mechanism retaining said tightening member and said handle member in an operative position relative to each other only as long as the load acting on the trough-shaped springs does not exceed the buckling load, said handle member pivoting relative to said tightening member to release the tightening torque when said buckling load is exceeded.
  • the torque wrench of claim 1 in which the handle member includes a sleeve having an enlarged open end and in which an insert block is fixedly disposed in said sleeve adjacent said enlarged open end.
  • ing member has arcuate slots of a shape complementary to the transverse cross-sectional shape of said trough-shaped springs and in which the other of the ends of said trough-shaped springs is inserted into said arcuate slots and secured therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US111841A 1970-06-03 1971-02-02 Torque wrench Expired - Lifetime US3701295A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45047749A JPS4824796B1 (enrdf_load_stackoverflow) 1970-06-03 1970-06-03

Publications (1)

Publication Number Publication Date
US3701295A true US3701295A (en) 1972-10-31

Family

ID=12783986

Family Applications (1)

Application Number Title Priority Date Filing Date
US111841A Expired - Lifetime US3701295A (en) 1970-06-03 1971-02-02 Torque wrench

Country Status (4)

Country Link
US (1) US3701295A (enrdf_load_stackoverflow)
JP (1) JPS4824796B1 (enrdf_load_stackoverflow)
DE (1) DE2106263C3 (enrdf_load_stackoverflow)
GB (1) GB1327680A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5737983A (en) * 1994-03-31 1998-04-14 Torque System Sweden Ab Dynamometric wrench
USD402866S (en) 1997-12-23 1998-12-22 Janssen William J Wrench
US6247385B1 (en) * 2000-03-09 2001-06-19 Arthur Wu Rotatable tool handle having a recovery device
US6869000B2 (en) * 1994-08-08 2005-03-22 Synthes (U.S.A.) Apparatus for cutting bodies having a non-circular cross section
US7069816B1 (en) 1998-09-14 2006-07-04 Johannes Luebbering Ag Motor-driven screw driver
WO2010055177A1 (es) 2008-11-14 2010-05-20 Biotechnology Institute, I Mas D, S.L. Llave para entregar un par máximo fijo o ajustable
CN102092020A (zh) * 2010-09-07 2011-06-15 苏州市天迅机具科技有限公司 一种弯曲型省力扳手
US9664315B1 (en) * 2014-08-20 2017-05-30 Samsung Electronics Co., Ltd. One-way nut fastener
US11130216B2 (en) * 2018-08-22 2021-09-28 Frank Hermansen Selectively adjustable torque indicating tool

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT323093B (de) * 1972-05-03 1975-06-25 Boehler & Co Ag Geb Schraubenschlüssel
JPS5223689U (enrdf_load_stackoverflow) * 1975-08-08 1977-02-19
JPS5279292U (enrdf_load_stackoverflow) * 1975-12-09 1977-06-13
GB8812527D0 (en) * 1988-05-26 1988-06-29 Bantex Ltd Improvements in & relating to fitting of aerials
DE4010775A1 (de) * 1990-04-04 1991-10-17 Wolf Gmbh Richard Medizinische zange
DE4338230C2 (de) * 1993-11-09 1996-07-18 Eberhard Tittel Vorrichtung zum Anziehen von Schraubelementen, insbesondere Befestigungsschrauben eines Lastenträgers für ein Kraftfahrzeug
DE19841870A1 (de) * 1998-09-14 2000-03-16 Konstanze Saathoff Fa Motorisch angetriebener Handschrauber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2303411A (en) * 1939-07-11 1942-12-01 Roy H Van Horn Torque wrench
US2315521A (en) * 1942-01-10 1943-04-06 Charles W Hart Torque wrench
US3386128A (en) * 1966-09-26 1968-06-04 Ryan Aeronautical Co Self-actuating, self-locking hinge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2303411A (en) * 1939-07-11 1942-12-01 Roy H Van Horn Torque wrench
US2315521A (en) * 1942-01-10 1943-04-06 Charles W Hart Torque wrench
US3386128A (en) * 1966-09-26 1968-06-04 Ryan Aeronautical Co Self-actuating, self-locking hinge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
General Dynamics, Convair Aerospace Division, Space and Ground Erectable Antenna Applications, 10/1970, p. 3, 16 150. *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5737983A (en) * 1994-03-31 1998-04-14 Torque System Sweden Ab Dynamometric wrench
US6869000B2 (en) * 1994-08-08 2005-03-22 Synthes (U.S.A.) Apparatus for cutting bodies having a non-circular cross section
USD402866S (en) 1997-12-23 1998-12-22 Janssen William J Wrench
US7069816B1 (en) 1998-09-14 2006-07-04 Johannes Luebbering Ag Motor-driven screw driver
US6247385B1 (en) * 2000-03-09 2001-06-19 Arthur Wu Rotatable tool handle having a recovery device
WO2010055177A1 (es) 2008-11-14 2010-05-20 Biotechnology Institute, I Mas D, S.L. Llave para entregar un par máximo fijo o ajustable
US20100126318A1 (en) * 2008-11-14 2010-05-27 Biotechnology Institute, I Mas D, S.L. Wrench for providing a fixed or adjustable maximum torque
US9545709B2 (en) 2008-11-14 2017-01-17 Biotechnology Institute, I Mas D, S.L. Wrench for providing a fixed adjustable maximum torque
CN102092020A (zh) * 2010-09-07 2011-06-15 苏州市天迅机具科技有限公司 一种弯曲型省力扳手
US9664315B1 (en) * 2014-08-20 2017-05-30 Samsung Electronics Co., Ltd. One-way nut fastener
US11130216B2 (en) * 2018-08-22 2021-09-28 Frank Hermansen Selectively adjustable torque indicating tool

Also Published As

Publication number Publication date
JPS4824796B1 (enrdf_load_stackoverflow) 1973-07-24
DE2106263B2 (de) 1973-02-22
DE2106263A1 (de) 1971-12-16
GB1327680A (en) 1973-08-22
DE2106263C3 (de) 1973-09-20

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