US2749786A - Predetermined torque release wrench - Google Patents

Predetermined torque release wrench Download PDF

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Publication number
US2749786A
US2749786A US313645A US31364552A US2749786A US 2749786 A US2749786 A US 2749786A US 313645 A US313645 A US 313645A US 31364552 A US31364552 A US 31364552A US 2749786 A US2749786 A US 2749786A
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US
United States
Prior art keywords
shank
rod
wrench
rigid
flexible rod
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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
US313645A
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English (en)
Inventor
Ollagnon Paul
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.)
Forges Stephanoises SA
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Forges Stephanoises 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 Forges Stephanoises SA filed Critical Forges Stephanoises SA
Application granted granted Critical
Publication of US2749786A publication Critical patent/US2749786A/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
    • 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

  • My invention relates to a predetermined torque release wrench of the type including a shank and a yielding elongated bar secured to the operative end thereof and extending inside a longitudinal groove of the shank.
  • a predetermined torque release wrench of the type including a shank and a yielding elongated bar secured to the operative end thereof and extending inside a longitudinal groove of the shank.
  • My invention has for its object improved means for clamping the shank and bar together at a predetermined point of their length so as to define the free operative length of the bar between the handle and the clamping means.
  • said clamping means are constituted by an at least partly annular member surrounding the shank bar and slidingly mounted thereon, the bar engaging the V-shaped bottom of a longitudinal groove in the shank so as to be clamped therein by the clamping member at any desired position of adjustment of said clamping member.
  • Figs. 1 and 2 are two general elevational views of the first embodiment in its inoperative position, in side view and in front view respectively.
  • Fig. 3 is a transverse section through line 33 of Fig. 2;
  • Fig. 4 is a plan view of the movable part of the releasing means
  • Fig. 5 is a side view of the said releasing means when ready to operate
  • Figs. 6 to 11 relate to a second embodiment of the dynamometric wrench
  • Fig 6 is a general elevational view of the wrench in the position occupied by it just before operation
  • Fig. 7 is a view similar to Fig. 6, the wrench being shown in longitudinal sectional view after operation of the releasing means;
  • Fig. 8 is a cross-section on a larger scale through line 8'8 of Fig. 6;
  • Figs. 9 and 10 are a front elevational view and a side View respectively of the stationary retaining projectionforming part of the releasing means;
  • Fig. 11 is a cross-section of the releasing means through line 11-41 of Fig. 6.
  • the wrench illustrated in Figs. 1 to 5 includes a rigid cylindrical shank 2 the upper end 3 of which carries a socket or fork adapted to engage a not or a screw to be fastened or released.
  • the lower end of the shank 2 is notched as illustrated so as to form a lateral projecting tongue 4 as best seen in Fig. 2.
  • a longitudinal groove 7 cut in the sidewall of the shank and having a uniform cross-section is engaged by said rod as clearly shown 2,749,786 Patented June 12, 1956 in Fig. 3.
  • the rod 6 projects slightly out of the groove 7 throughout the length of the shank as shown at 6:1 and extends beyond the shank 2 as shown at 6b.
  • An annular slider 8 enclosing the system constituted by the shank 2 and the rod 6 may slide over a predetermined portion of the length of said system between the securing point 5 for the rod 6 and the free end 4 of the shank 2 and it may be held fast at any predetermined desired point.
  • the shank 2 carries a scale 9 (Figs. 1 and 2) while the slider 8 is constituted by a ring knurled outwardly and the inner diameter of which is slightly larger than the outer diameter of the shank 2.
  • the slider 8 in effect forms a rigid unit of a more or less considerable length including part of the flexible rod 6 and the shank 2.
  • the outer end 6b (Fig. 2) of the rod 6 is submitted to a force that urges it sideways a predetermined distance m (Fig. 5) away from the terminal tongue 4 of the shank 2, said force should increase when the free length of the rod 6 is shorter, i. e. when the slider 8 is nearer the free end 4 of the rigid shank 2.
  • a cylindrical section 12b the outer diameter of which is smaller than the outer diameter of the bead 12a;
  • a wide collar the outer periphery of which is knurled.
  • the annular bead 12a shows a gap at 12d over a small part of its periphery, the bottom of said gap registering radially with the cylindrical surface of the section 12b as shown in Fig. 5.
  • the tongue 4 extending alongside of the right hand side of the cylindrical section 12b serves as a carrier for a pointed tool 13, the depth of projection of which is adjusted by the locking nut 13a so that its tip may engage the outside of the cylindrical section 12b of the ring 12.
  • the flexible rod 6 carries a coil spring 14 and beyond the latter a grip 15 which is secured to it by a screw 16. Consequently, the spring 14 bearing against the grip 15 constantly urges the ring 12 against the end of the shank 2.
  • the free length of the flexible rod 6 is adjusted, in accordance with the stress to be transmitted, by shifting the slider 8 over the scale 9. This adjustment being performed, the slider is shifted angularly. Its inner curve 81') acts then as a cam and urges energetically the desired 3 point of the length of the rod 6 against the bottom of the groove 7.
  • the ring 12 is then caused to be angularly shifted through action on its knurled flange 120 until the gap 12b in the bead 12a registers with the pointed tool 13.
  • the ring 12 is drawn then outwardly towards the handle 15 with a view to stressing the spring 14- and, this being done, the ring 12 is again shifted by a fraction of a revolution until its bead 12a, submitted to the inward action of the spring 14, engages the end of the pointed tool 13.
  • the latter holds now the ring 12 in position against the action of the spring 14.
  • the second embodiment illustrated in Figs. 6 to 11 is of a similar type, but somewhat improved, wherein the groove 7 in the shank 2, the bottom of which carries the rod 6, assumes a V-shaped outline which constrains said rod 6 to remain always perfectly centered in said groove by reason of the presence of the two surfaces that are symmetrically arranged to either side of the longitudinal plane of symmetry of the groove (Fig. 8).
  • the slider 8 is provided with a laterally projecting extension 21 forming a cylindrical bore extending perpendicularly to the general axis of the wrench; said bore carrying two auxiliary sliders 22 provided each with a slope 23 engaging either side of the portion of the rod 6 that projects at 6:1 outside the recess or groove 7 in the shank 2.
  • One of said sliders 22 is provided with a smooth hole 24 while the other slider 22 is provided with a tapped hole 25 inside which is screwed a threaded rod 26 carrying a knurled control knob 27, the shoulder 28 on which forms a stop bearing against the rear end of the firstmentioned slider 22 having a smoothhole 24; consequently it is possible to screw said threaded rod 26 into the other slider 22 provided with the tapped opening 25 so as to urge the two sliders together and thereby against the projecting portion 6a of the rod 6.
  • these sliders 22 engage the inner surface of the bore 29 in the extension 21.
  • the member engaging or retaining the releasable ring 12, instead of being constituted by a pointed tool 13, is formed by a blade 30 assuming the shape of a knife and secured by a screw 31 to the outer end of the shank 2.
  • the preliminary setting of the releasing means is performed in the manner disclosed hereinabove with reference to Figs. 1 to 5 by turning the ring 12 so as to bring the gap 12b in the bead 12a into register with the knife 30.
  • the ring 12 may be drawn rearwardly while compressing the spring 14, after which it is turned by a fraction of a revolution so as to bring a section of the projecting annular edge of the bead 12a beyond the knife 30 against which it then abuts as soon as it is urged back by the spring 14.
  • the release of the ring 12 is provided as soon as the sag assumed by the rod 6 in register with the knife 30 has reached the value m or a slightly greater value.
  • the ring or slider 8 sliding over the shank 2 carries a screw 32 the tip of which engages a groove 33 provided longitudinally of the shank 2 on the side diametrically opposed to the groove 7 carrying the flexible rod 6, said engagement between the screw 32 and the shank 2 ensuring a more reliable guiding of the slider 8.
  • the rod 6 is advantageously secured to the shank 2 as illustrated in Fig. 7, by means of a shouldered screw 35 passing with a clearance through the rod 6.
  • This arrangement is associated with a sleeve 36 capping the end of said rod and of said shank and adapted to removably carry the actual tool 37, that may be any conventional wrench socket and is provided to this end with a projecting tail-piece 38 extending into said sleeve, which is thus substituted for the stationary tip 3 of Fig. 1.
  • a wrench head a rigid substantially cylindrical shank to one end of which said head is rigidly secured and provided with a longitudinal groove of constant cross-sectional size and shape, a flexible rod extending longitudinally inside the groove in the rigid shank and projecting outwardly of the periphery of the shank, means permanently and rigidly securing the end of the flexible rod nearest the wrench head to the shank, a hand grip rigid with the other end of the flexible rod, a slider slidably mounted on the rigid shank and engaging the flexible rod at an adjustable point of its length to define on said rod a portion remaining in permanent contacting relationship with the groove in the rigid shank, whatever stress is imparted to the grip to urge it away from the shank and thereby move the wrench head in a corresponding direction, and a free portion adapted to be bent away from the rigid shank upon actuation of the hand grip, mechanical means whereby the bending of the free portion of the flexible rod beyond a predetermined distance with reference to the shank
  • a wrench head a rigid substantially cylindrical shank to one end of which said head is rigidly secured and provided throughout its length with a rectilinear groove
  • a flexible rod extending along said groove and engaging the surface thereof through at least a part of its length starting from the wrench headand projecting laterally out of said groove to a small extent
  • a wrench head a rigid substantially cylindrical shank to one end of which said head is rigidly secured and provided with a longitudinal groove of constant cross-sectional size and shape, a flexible rod extending longitudinally inside the groove in the rigid shank and projecting slightly beyond the outline of the shank, means permanently and rigidly securing the end of the flexible rod nearest the wrench head to the shank, a hand grip rigid with the other end of the flexible rod, an at least partly annular member slidingly fitted round the shank and rod system to engage the flexible rod at an adjsutaole point of its length and to define thereby on said rod a portion lying between the securing means and the sliding member and held by the latter in contacting relationship with the groove in the rigid shank, whatever stress is imparted to the grip to urge the rod away from the shank and thereby move the wrench head in a corresponding direction, and an outer free portion extending between the sliding member and the grip and adapted to be bent away from the rigid shank upon
  • a wrench head a rigid substantially cylindrical shank to one end of which said head is rigidly secured and provided with a longitudinal groove of constant cross-sectional size and shape having a substantially V-shaped bottom, a flexible rod extending longitudinally inside the groove in the rigid shank and projecting slightly beyond the outline of the shank, means permanently and rigidly securing the end of the flexible rod nearest the wrench head to the shank, a hand grip rigid with the other end of the flexible rod, an at least partly annular member slidingly fitted round the shank and rod system to engage the flexible rod at an adjustable point of its length and to define thereby on said rod a portion lying between the securing means and the sliding member and held by the latter in contacting relationship with the groove in the rigid shank, whatever stress is imparted to the grip to urge the rod away from the shank and thereby move the wrench head in a corresponding direction, and an outer free portion extending between the sliding memher and the grip and adapted to be bent away from the rigid shank
  • a wrench head a rigid substantially cylindrical shank to one end of which said head is rigidly secured and provided with a longitudinal groove of constant cross-sectional size and shape, a flexible rod extending longitudinally inside the groove in the rigid shank and projecting slightly beyond the outline of the shank, means permanently and rigidly securing the end of the flexible rod nearest the wrench head to the shank, a hand grip rigid with the other end of the flexible rod, an at least partly annular member slidingly fitted round the shank and rod system to engage the flexible rod at an adjustable point of its length and to define thereby on said rod a portion lying between the securing means and the sliding member and held by the latter in contacting relationship with the groove in the rigid shank, whatever stress is imparted to the grip to urge the rod away from the shank and thereby move the wrench head in a corresponding direction and an outer free portion extending between the sliding member and the grip and adapted to be bent away from the rigid shank upon actuation of the head grip, two wedge
  • a wrench head in a predetermined torque release wrench, the combination of a wrench head, a rigid substantially cylindrical shank to one end of which said head is rigidly secured and provided with a longitudinal groove of constant cross-sectional size and shape, said shank including a terminal step at its other end, a flexible rod extending longitudinally inside the groove in the rigid shank and projecting slightly beyond the outline of the shank, means permanently and rigidly securing the end of the flexible rod nearest the wrench head to the shank, a hand grip rigid with the other end of the flexible rod, an at least partly annular member slidingly fitted round the shank and rod system to engage the flexible rod at an adjustable point of its length and to define thereby on said rod a portion lying between the securing means and the sliding member and held by the latter in contacting relationship with the groove in the rigid shank, whatever stress is imparted to the grip to urge the rod away from the shank and thereby move the wrench head in a corresponding direction, and an outer free portion extending between the sliding member and the grip and adapted to be
  • a wrench head a rigid substantially cylindrical shank to one end of which said head is rigidly secured and provided with a longitudinal groove of constant cross-sectional size and shape, a flexible rod extending longitudinally inside the groove in the rigid shank and projecting slightly beyond the outline of the shank, a sleeve capping with a slight clearance the cooperating ends of said flexible rod and rigid shank, means for removably and rigidly securing the wrench head to said sleeve, means rigidly and permanently securing the flexible rod and rigid shank to said sleeve, a hand grip rigid with the other end of the flexible rod, an at least partly annular member slidingly fitted round the shank and rod system to engage the flexible rod at an adjustable point of its length and to define thereby on said rod a portion lying between the securing means and the sliding member and held by the latter in contacting relationship with the groove in the rigid shank, whatever stress is imparted to the grip to urge the rod away from the shank
  • a wrench head a rigid substantially cylindrical shank to one end of which said head is rigidly secured and the free end of which is recessed and provided throughout its length with a rectilinear groove of constant cross-section having two symmetrical sloping elements, a flexible rod extending along said groove and engaging the surface thereof through at least a part of its length starting from the wrench head and projecting laterally out of said groove to a small extent, means permanently and rigidly securing the end of the flexible rod nearest the wrench head to the corresponding point of the shank, a hand grip rigid with the other end of the flexible rod, a collar slidably fitted over the system including the shank and the rod, means for clamping the collar at any desired point of its travel over said system to define the part of the flexible rod engaging the groove on one hand and the free end of the flexible rod on the other hand, an annular member slidingly carried by the outer end of the flexible rod on the inside of the hand grip, a spring urging said annular member away

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US313645A 1951-10-26 1952-10-08 Predetermined torque release wrench Expired - Lifetime US2749786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR945829X 1951-10-26

Publications (1)

Publication Number Publication Date
US2749786A true US2749786A (en) 1956-06-12

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Application Number Title Priority Date Filing Date
US313645A Expired - Lifetime US2749786A (en) 1951-10-26 1952-10-08 Predetermined torque release wrench

Country Status (6)

Country Link
US (1) US2749786A (en(2012))
BE (1) BE514621A (en(2012))
DE (1) DE945829C (en(2012))
FR (2) FR1044176A (en(2012))
GB (1) GB729939A (en(2012))
IT (1) IT497238A (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403530A (en) * 1980-01-11 1983-09-13 Cambridge Consultants Limited Torque wrench
US20030136567A1 (en) * 2002-01-22 2003-07-24 Wherry Helen R. Wedge shaped planting tool
US20100233653A1 (en) * 2009-03-11 2010-09-16 Cheng-Kang Yeh Wrench for dental implant
DE102017107278A1 (de) 2017-02-20 2018-08-23 Bobby Hu Anzeigender Drehmomentschlüssel
CN108453658A (zh) * 2017-02-20 2018-08-28 胡厚飞 扭力指示扳手

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791141A (en) * 1955-04-28 1957-05-07 Plomb Tool Company Magnetic control means for predetermined torque release wrench
DE1628028B1 (de) * 1966-02-01 1970-12-10 Eduard Wille Fa Drehmomentschlüssel mit einer Einrichtung zur Signalgabe

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122760A (en) * 1936-07-16 1938-07-05 Hughes Tool Co Yieldable pipe wrench
DE675755C (de) * 1936-03-27 1939-05-16 Werke Kiel Akt Ges Deutsche Schraubenschluessel
DE700320C (de) * 1938-08-20 1940-12-18 Max Forst Drehmoment-Sicherheitsschraubenschluessel
US2250941A (en) * 1938-05-21 1941-07-29 Automotive Maintenance Mach Co Torque measuring wrench
US2358461A (en) * 1942-10-28 1944-09-19 Charles A Latimer Pressure releasable wrench
US2381226A (en) * 1943-03-27 1945-08-07 Parker Appliance Co Safety wrench
FR985565A (fr) * 1949-02-23 1951-07-20 Facom Clé dynamométrique
DE820275C (de) * 1950-09-23 1951-11-08 Albert Thode & Co Grenzkraft-Schraubenschluessel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE675755C (de) * 1936-03-27 1939-05-16 Werke Kiel Akt Ges Deutsche Schraubenschluessel
US2122760A (en) * 1936-07-16 1938-07-05 Hughes Tool Co Yieldable pipe wrench
US2250941A (en) * 1938-05-21 1941-07-29 Automotive Maintenance Mach Co Torque measuring wrench
DE700320C (de) * 1938-08-20 1940-12-18 Max Forst Drehmoment-Sicherheitsschraubenschluessel
US2358461A (en) * 1942-10-28 1944-09-19 Charles A Latimer Pressure releasable wrench
US2381226A (en) * 1943-03-27 1945-08-07 Parker Appliance Co Safety wrench
FR985565A (fr) * 1949-02-23 1951-07-20 Facom Clé dynamométrique
DE820275C (de) * 1950-09-23 1951-11-08 Albert Thode & Co Grenzkraft-Schraubenschluessel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403530A (en) * 1980-01-11 1983-09-13 Cambridge Consultants Limited Torque wrench
US20030136567A1 (en) * 2002-01-22 2003-07-24 Wherry Helen R. Wedge shaped planting tool
US20100233653A1 (en) * 2009-03-11 2010-09-16 Cheng-Kang Yeh Wrench for dental implant
DE102017107278A1 (de) 2017-02-20 2018-08-23 Bobby Hu Anzeigender Drehmomentschlüssel
CN108453658A (zh) * 2017-02-20 2018-08-28 胡厚飞 扭力指示扳手
US10315297B2 (en) * 2017-02-20 2019-06-11 Bobby Hu Torque indication wrench
CN108453658B (zh) * 2017-02-20 2019-11-05 胡厚飞 扭力指示扳手

Also Published As

Publication number Publication date
FR1044176A (fr) 1953-11-16
FR1056588A (fr) 1954-03-01
BE514621A (en(2012))
DE945829C (de) 1956-07-19
GB729939A (en) 1955-05-11
IT497238A (en(2012))

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