US3865007A - Torque determining allen screw - Google Patents

Torque determining allen screw Download PDF

Info

Publication number
US3865007A
US3865007A US384165A US38416573A US3865007A US 3865007 A US3865007 A US 3865007A US 384165 A US384165 A US 384165A US 38416573 A US38416573 A US 38416573A US 3865007 A US3865007 A US 3865007A
Authority
US
United States
Prior art keywords
nubs
recess
screw
vertices
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
US384165A
Inventor
Harris I Stanback
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.)
Schneider Electric USA Inc
Original Assignee
Square D Co
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 Square D Co filed Critical Square D Co
Priority to US384165A priority Critical patent/US3865007A/en
Priority to CA203,508A priority patent/CA1002797A/en
Application granted granted Critical
Publication of US3865007A publication Critical patent/US3865007A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
    • H01R11/12—End pieces terminating in an eye, hook, or fork

Definitions

  • the screw has a tool-receiving recess comprising 21 basically cylindrical outer recessed portion and a hexagonal inner recessed portion.
  • the outer recessed portion has a plurality of nubs or protrusions spaced circumferentially around its cylindrical wall.
  • a conventional hexagonal allen wrench inserted in the outer recessed portion is used to tighten the screw by engagement with the nubs.
  • the nubs are designed so that they will be sheared by the wrench when a predetermined torque is exerted by the wrench.
  • the screw can be loosened by the wrench when the wrench is received in the inner recessed portion.
  • the wrench can be inserted in the inner recessed portion before the nubs are sheared; in a second embodiment, shearing of the nubs is necessary before the wrench can be inserted in the inner recessed portion.
  • Torque indicating wrenches are conventionally used to apply a predetermined torque when tightening a screw having a wrench-receiving socket such as an allen screw. These wrenches are relatively expensive and are not always available. Further, it is of course impossible'to visually examine an installed conventional socket head screw and determine whether it has been tightened to a specified torque. Consequently, a need exists for a socket head screw which can be tightened to a predetermined torque value with a conventional socket wrench and which provides a visible indication that it has been tightened to the predetermined torque value.
  • a socket head screw in accordance with this invention has a recess extending from one end comprising an outer basically cylindrical recess and an inner wrench-receiving socket.
  • a plurality of inwardly protruding nubs are circumferentially spaced around the cylindrical wall of the outer recess.
  • the invention is described as applied to an allen head screw which has a hexagonal recess, but its application to other socket head screws is readily apparent.
  • the wrench can be fully inserted into the recess before the nubs are sheared.
  • the nubs are positioned directly above the vertices of the inner hexagonal recess thus blocking entry of the wrench into the inner recess before the nubs are sheared.
  • FIG. 1 is a perspective view showing a pair of identical allen screws in accordance with this invention in association with an electrical connector;
  • FIG. 2 is a top view of one of the allen screws of FIG.
  • FIG. 3 is a sectional view taken along the lines 3-3 of FIG. 2;
  • FIGS. 4 and 5 of sectional views taken along the lines 4-4 and 5-5 respectively, of FIG. 3;
  • FIG. 6 is a sectional view taken at the same relative location as FIG. 4 showing another embodiment of the invention.
  • FIGS. 1-5 a torque determining allen head screw 10 in accordance with one embodiment of the invention is shown.
  • a pair of the screws 10 are shown as used to clamp a cable 9 in an electrical connector 11.
  • the screw 10 has an externally threaded body portion 12 having a recess 14 extending axially from one end, the recess 14 comprising an outer basically cylindrical recess 16 and an adjacent coaxial inner hexagonal recess 18.
  • the cylindrical side wall of the recess 16 is provided with a plurality of circumferentially spaced nubs 20 each generally triangular in cross-section and protruding inwardly from the wall.
  • Each of the nubs 20 has side walls 20a and 20b. As shown, there are preferably three such nubs 20 and, the nubs 20 extend axially inwardly from the head end surface of the screw 10 to the inner end of the recess 16.
  • the nubs 20 may be made shorter if desired to reduce the torque value required for shearing.
  • the nubs 20 are positioned respectively over alternate ones of a plurality of vertices 22 of the hexagonal recess 18, vertices 23 of the respective nubs 20 being slightly displaced from the vertices 22 immediately beneath them.
  • Shoulders 24 defined at the intersection of the cylindrical recess 16 with the hexagonal recess 18 serve as a support for the head of an allen wrench 30 during initial use of the screw 10.
  • the hexagonal head of an allen wrench 30 having a maximum width slightly less than the diameter of the cylindrical upper recessl6 is inserted into the recess 16 with end surfaces of the wrench 30 near the vertices of the wrench 30 resting respectively on the guide surfaces 24.
  • the wrench 30 is then rotated clockwise within the cylindrical recess 16 until areas of three of the side walls of the wrenchrespectively engage the side walls 20a of the nubs 20.
  • Further rotation of the wrench 30 causes the screw 10 to rotate clockwise and advance inwardly of an associated threaded member such as a connector of the type shown in FIG. 1.
  • the screw advances until the screw encountersresistance such as contact with a cable as shown inFIG. 1.
  • the nubs 20 resist further movement of the wrench 30.
  • Increased torque applied to the wrench 30 causes the nubs 20 to shear off thereby insuring that the screw 10 has been tightened to a predetermined torque value.
  • the screw 10 can be loosened by inserting the wrench 30 into the inner recess 18 and rotating the wrench 30 counterclockwise.
  • an allen screw 32 has an externally threaded portion 34 and a recess 36 extending inwardly from one end surface of the screw 32 and comprising an outer generally cylindrical recess 38 and an inner hexagonal recess 40.
  • a plurality of shearable nubs 42 like the nubs 20 of the first embodiment extend inwardly from the cylindrical side wall of the recess 38, but have their vertices positioned directly above vertices 44 of the hexagonal recess 40 instead of displaced therefrom as in the first embodiment. Therefore, the wrench 30 cannot be advanced into the hexagonal recess 40 until the nubs 42 are sheared and the screw thereby installed at the predetermined torque value.
  • the shearing of the nubs 20 or 42 provides a visual indication that the screw or 32 has been installed at a predetermined level of torque.
  • the screw 10, in the first embodiment is shown as having right-handed threads.
  • the first embodiment of the invention can also be used on a screw with left-hand threads by displacing the nubs slightly to the opposite side of the vertices 22.
  • the second embodiment may be used as shown on a screw with either right-hand or left-hand threads.
  • a torque-determining socket head screw comprising an exteriorly threaded cylindrical body having a tool-receiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner recess portion having a plurality of angularly disposed flat sides, the inner recess portion having a transverse dimension smaller than the diameter of the outer recess and being designed to receive a standard size tool having angularly disposed sides so as to be complementary to the inner recess, and at least one frangible nub projecting radially inwardly from the cylindrical wall of the outer recess, the nub being engageable by the tool and shearable upon the application of a predetermined torque thereto by the tool thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
  • a torque determining allen head screw comprising an exteriorly threaded cylindrical body having a toolreceiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner hexagonal recess portion, the hexagonal recess having a transverse demension smaller than the diameter of the outer recess, the hexagonal recess portion being designed to receive a standard tool such as an allen wrench, and three frangible nubs circumferentially spaced on and projecting radially inwardly from the cylindrical wall of the outer recess, the nubs being engageable by an allen wrench and shearable upon the application of a predetermined torque thereto by the wrench thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.

Landscapes

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

Abstract

The screw has a tool-receiving recess comprising a basically cylindrical outer recessed portion and a hexagonal inner recessed portion. The outer recessed portion has a plurality of nubs or protrusions spaced circumferentially around its cylindrical wall. A conventional hexagonal allen wrench inserted in the outer recessed portion is used to tighten the screw by engagement with the nubs. The nubs are designed so that they will be sheared by the wrench when a predetermined torque is exerted by the wrench. The screw can be loosened by the wrench when the wrench is received in the inner recessed portion. In one embodiment, the wrench can be inserted in the inner recessed portion before the nubs are sheared; in a second embodiment, shearing of the nubs is necessary before the wrench can be inserted in the inner recessed portion.

Description

nite States Patent '[193 Stanback Feb. 11, 1975 TORQUE DETERMINING ALLEN SCREW [75] Inventor: Harris I. Stanback, Lexington, Ky. [73] Assignee: Square D Company, Park Ridge, Ill. [22] Filed: July 30, 1973 [2|] Appl. No.: 384,165
684,82l 12/1952 Great Britain ..85/45 Primary E.\'aminerRamon S. Britts Arturney, Agent, or FirmErnest S. Kettleson; Harold J. Rathbun; Carmen B. Patti [57] ABSTRACT The screw has a tool-receiving recess comprising 21 basically cylindrical outer recessed portion and a hexagonal inner recessed portion. The outer recessed portion has a plurality of nubs or protrusions spaced circumferentially around its cylindrical wall. A conventional hexagonal allen wrench inserted in the outer recessed portion is used to tighten the screw by engagement with the nubs. The nubs are designed so that they will be sheared by the wrench when a predetermined torque is exerted by the wrench. The screw can be loosened by the wrench when the wrench is received in the inner recessed portion. In one embodiment, the wrench can be inserted in the inner recessed portion before the nubs are sheared; in a second embodiment, shearing of the nubs is necessary before the wrench can be inserted in the inner recessed portion.
9 Claims, 6 Drawing Figures Torque indicating wrenches are conventionally used to apply a predetermined torque when tightening a screw having a wrench-receiving socket such as an allen screw. These wrenches are relatively expensive and are not always available. Further, it is of course impossible'to visually examine an installed conventional socket head screw and determine whether it has been tightened to a specified torque. Consequently, a need exists for a socket head screw which can be tightened to a predetermined torque value with a conventional socket wrench and which provides a visible indication that it has been tightened to the predetermined torque value.
SUMMARY OF THE INVENTION This invention provides an improved socket head screw which can be tightened to a known torque value with a conventional socket wrench. A socket head screw in accordance with this invention has a recess extending from one end comprising an outer basically cylindrical recess and an inner wrench-receiving socket. A plurality of inwardly protruding nubs are circumferentially spaced around the cylindrical wall of the outer recess.
When a socket head wrench having a maximum head width slightly less than the diameter of the cylindrical recess is inserted into the cylindrical recess and rotated, surfaces of the wrench adjacent its vertices engage the nubs and turn the screw to advance it inwardly of a threaded opening. The nubs are designed to be sheared when a predetermined torque adequate for tightening the screw to thedesired degree of tightness is applied to them by the wrench, thus providing an indication that the screw has been adequately tightened. The wrench may be inserted into the inner recess to loosen the screw.
The invention is described as applied to an allen head screw which has a hexagonal recess, but its application to other socket head screws is readily apparent.
In one embodiment, the wrench can be fully inserted into the recess before the nubs are sheared. In another embodiment, the nubs are positioned directly above the vertices of the inner hexagonal recess thus blocking entry of the wrench into the inner recess before the nubs are sheared.
It is an object of the invention to provide an improved allen screw which can be tightened to a known torque value using a conventional allen wrench and which provides a visual indication that the known torque value has been reached.
DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a pair of identical allen screws in accordance with this invention in association with an electrical connector;
FIG. 2 is a top view of one of the allen screws of FIG.
FIG. 3 is a sectional view taken along the lines 3-3 of FIG. 2;
FIGS. 4 and 5 of sectional views taken along the lines 4-4 and 5-5 respectively, of FIG. 3; and
FIG. 6 is a sectional view taken at the same relative location as FIG. 4 showing another embodiment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the FIGS. 1 5, a torque determining allen head screw 10 in accordance with one embodiment of the invention is shown. In FIG. 1 a pair of the screws 10 are shown as used to clamp a cable 9 in an electrical connector 11.
The screw 10 has an externally threaded body portion 12 having a recess 14 extending axially from one end, the recess 14 comprising an outer basically cylindrical recess 16 and an adjacent coaxial inner hexagonal recess 18. The cylindrical side wall of the recess 16 is provided with a plurality of circumferentially spaced nubs 20 each generally triangular in cross-section and protruding inwardly from the wall. Each of the nubs 20 has side walls 20a and 20b. As shown, there are preferably three such nubs 20 and, the nubs 20 extend axially inwardly from the head end surface of the screw 10 to the inner end of the recess 16. The nubs 20 may be made shorter if desired to reduce the torque value required for shearing.
The nubs 20 are positioned respectively over alternate ones of a plurality of vertices 22 of the hexagonal recess 18, vertices 23 of the respective nubs 20 being slightly displaced from the vertices 22 immediately beneath them. Shoulders 24 defined at the intersection of the cylindrical recess 16 with the hexagonal recess 18 serve as a support for the head of an allen wrench 30 during initial use of the screw 10.
In use, the hexagonal head of an allen wrench 30 having a maximum width slightly less than the diameter of the cylindrical upper recessl6 is inserted into the recess 16 with end surfaces of the wrench 30 near the vertices of the wrench 30 resting respectively on the guide surfaces 24. The wrench 30 is then rotated clockwise within the cylindrical recess 16 until areas of three of the side walls of the wrenchrespectively engage the side walls 20a of the nubs 20. Further rotation of the wrench 30 causes the screw 10 to rotate clockwise and advance inwardly of an associated threaded member such as a connector of the type shown in FIG. 1. The screw advances until the screw encountersresistance such as contact with a cable as shown inFIG. 1. At this point, the nubs 20 resist further movement of the wrench 30. Increased torque applied to the wrench 30 causes the nubs 20 to shear off thereby insuring that the screw 10 has been tightened to a predetermined torque value.
The screw 10 can be loosened by inserting the wrench 30 into the inner recess 18 and rotating the wrench 30 counterclockwise.
In another embodiment of the invention shown in FIG. 6, an allen screw 32 has an externally threaded portion 34 and a recess 36 extending inwardly from one end surface of the screw 32 and comprising an outer generally cylindrical recess 38 and an inner hexagonal recess 40. A plurality of shearable nubs 42 like the nubs 20 of the first embodiment extend inwardly from the cylindrical side wall of the recess 38, but have their vertices positioned directly above vertices 44 of the hexagonal recess 40 instead of displaced therefrom as in the first embodiment. Therefore, the wrench 30 cannot be advanced into the hexagonal recess 40 until the nubs 42 are sheared and the screw thereby installed at the predetermined torque value.
In either embodiment, the shearing of the nubs 20 or 42 provides a visual indication that the screw or 32 has been installed at a predetermined level of torque.
The screw 10, in the first embodiment is shown as having right-handed threads. The first embodiment of the invention can also be used on a screw with left-hand threads by displacing the nubs slightly to the opposite side of the vertices 22. The second embodiment may be used as shown on a screw with either right-hand or left-hand threads. I
Thus it is apparent that there has been provided, in accordance with the invention, a torque determining tend axially inwardly from said one end face of the screw to an inner end of the cylindrical recess portion.
allen head screw that fully satisfies the objects, aims,
and advantages set forth above. While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.
I claim:
1. A torque-determining socket head screw comprising an exteriorly threaded cylindrical body having a tool-receiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner recess portion having a plurality of angularly disposed flat sides, the inner recess portion having a transverse dimension smaller than the diameter of the outer recess and being designed to receive a standard size tool having angularly disposed sides so as to be complementary to the inner recess, and at least one frangible nub projecting radially inwardly from the cylindrical wall of the outer recess, the nub being engageable by the tool and shearable upon the application of a predetermined torque thereto by the tool thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
2. A screw as claimed in claim 1 wherein there are additional nubs on the cylindrical wall, the nubs being circumferentially spaced from each other.
3. A screw as claimed in claim 2 wherein the nubs are generally triangular in radial cross-section.
4. A screw as claimed in claim 2 wherein the nubs ex- 5. A screw as claimed in claim 2 wherein the inner recess portion has a plurality of vertices and, the nubs are displaced slightly circumferentially in the same direction from alternate ones of the vertices, respectively.
6. A screw as claimed in claim 2 wherein the inner recess portion has a plurality of vertices and the nubs are in substantial axial alignment with alternate ones of the vertices, respectively, said nubs extending radially inwardly beyond the vertices of the inner recess, thereby requiring shearing of the nubs before the tool can be advanced into the inner recess.
7. A torque determining allen head screw comprising an exteriorly threaded cylindrical body having a toolreceiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner hexagonal recess portion, the hexagonal recess having a transverse demension smaller than the diameter of the outer recess, the hexagonal recess portion being designed to receive a standard tool such as an allen wrench, and three frangible nubs circumferentially spaced on and projecting radially inwardly from the cylindrical wall of the outer recess, the nubs being engageable by an allen wrench and shearable upon the application of a predetermined torque thereto by the wrench thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
8. A screw as claimed in claim 7 wherein the inner hexagonal recess portion has six vertices and the nubs are displaced slightly circumferentially in the same direction from alternate ones of the vertices, respectively.
9. A screw as claimed in claim 7 wherein the inner hexagonal recess portion has six vertices and the nubs are positioned in substantial axial alignment with alternate ones of the vertices, said nubs extending radially inwardly beyond the vertices of the inner recess, thereby requiring shearing of the nubs before the wrench can be advanced into the hexagonal recess.

Claims (9)

1. A torque-determining socket head screw comprising an exteriorly threaded cylindrical body having a tool-receiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner recess portion having a plurality of angularly disposed flat sides, the inner recess portion having a transverse dimension smaller than the diameter of the outer recess and being designed to receive a standard size tool having angularly disposed sides so as to be complementary to the inner recess, and at least one frangible nub projecting radially inwardly from the cylindrical wall of the outer recess, the nub being engageable by the tool and shearable upon the application of a predetermined torque thereto by the tool thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
2. A screw as claimed in claim 1 wherein there are additional nubs on the cylindrical wall, the nubs being circumferentially spaced from each other.
3. A screw as claimed in claim 2 wherein the nubs are generally triangular in radial cross-section.
4. A screw as claimed in claim 2 wherein the nubs extend axially inwardly from said one end face of the screw to an inner end of the cylindrical recess portion.
5. A screw as claimed in claim 2 wherein the inner recess portion has a plurality of vertices and, the nubs are displaced slightly circumferentially in the same direction from alternate ones of the vertices, respectively.
6. A screw as claimed in claim 2 wherein the inner recess portion has a plurality of vertices and the nubs are in substantial axial alignment with alternate ones of the vertices, respectively, said nubs extending radially inwardly beyond the vertices of the inner recess, thereby requiring shearing of the nubs before the tool can be advanced into the inner recess.
7. A torque determining allen head screw comprising an exteriorly threaded cylindrical body having a tool-receiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner hexagonal recess portion, the hexagonal recess having a transverse demension smaller than the diameter of the outer recess, the hexagonal recess portion being designed to receive a standard tool such as an allen wrench, and three frangible nubs circumferentially spaced on and projecting radially inwardly from the cylindrical wall of the outer recess, the nubs being engageable by an allen wrench and shearable upon the application of a predetermined torque thereto by the wrench thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
8. A screw as claimed in claim 7 wherein the inner hexagonal recess portion has six vertices and the nubs are displaced slightly circumferentially in the same direction from alternate ones of the vertices, respectively.
9. A screw as claimed in claim 7 wherein the inner hexagonal recess portion has six vertices and the nubs are positiOned in substantial axial alignment with alternate ones of the vertices, said nubs extending radially inwardly beyond the vertices of the inner recess, thereby requiring shearing of the nubs before the wrench can be advanced into the hexagonal recess.
US384165A 1973-07-30 1973-07-30 Torque determining allen screw Expired - Lifetime US3865007A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US384165A US3865007A (en) 1973-07-30 1973-07-30 Torque determining allen screw
CA203,508A CA1002797A (en) 1973-07-30 1974-06-26 Torque determining allen screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US384165A US3865007A (en) 1973-07-30 1973-07-30 Torque determining allen screw

Publications (1)

Publication Number Publication Date
US3865007A true US3865007A (en) 1975-02-11

Family

ID=23516291

Family Applications (1)

Application Number Title Priority Date Filing Date
US384165A Expired - Lifetime US3865007A (en) 1973-07-30 1973-07-30 Torque determining allen screw

Country Status (2)

Country Link
US (1) US3865007A (en)
CA (1) CA1002797A (en)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963322A (en) * 1975-01-23 1976-06-15 Ite Imperial Corporation Torque controlling set screw for use with the cable of solderless connectors, or the like
US4043369A (en) * 1976-03-11 1977-08-23 Abernethy Robert R Edge deformable lock nut
US4149434A (en) * 1978-03-17 1979-04-17 Leroy Wilson Screw and screwdriver therefor
US4199216A (en) * 1975-01-23 1980-04-22 I-T-E Imperial Corp. Torque controlling set screw for use with the cable of solderless connectors, or the like
US4260005A (en) * 1977-11-09 1981-04-07 Vsi Corporation Self-locking fastener, fastener system, and process
USD270229S (en) 1980-10-22 1983-08-23 The Eastern Company Tool and operator head for tool-operated lock
USD270424S (en) 1980-10-22 1983-09-06 The Eastern Company Tool operator for tool-operated locks
US4521146A (en) * 1982-11-08 1985-06-04 Maron Products, Inc. Lug nut cap
US4786224A (en) * 1986-04-24 1988-11-22 Maron Products, Inc. Wheel lug nut cover
US5438813A (en) * 1992-12-02 1995-08-08 A. P. Green Industries, Inc. Method for insulating walls of furnace
US5452974A (en) * 1993-03-04 1995-09-26 Air Industries Corporation Deformable locking fastener system and method of use
WO1996031706A1 (en) * 1995-04-07 1996-10-10 B & H (Nottingham) Limited Fastener
EP0779440A1 (en) * 1995-12-14 1997-06-18 Ford-Werke Aktiengesellschaft Drain bolt for a sheet metal container
US5692419A (en) * 1993-03-04 1997-12-02 Air Industries Corporation Deformable locking fastener system and method of use
EP0892462A2 (en) * 1997-07-16 1999-01-20 Harting KGaA Contact element with a connection for a stranded wire
US6209424B1 (en) * 1994-03-15 2001-04-03 Sicame Electrical Developments Ltd. Clamping screws
US6238155B1 (en) 1995-11-06 2001-05-29 Southco, Inc. Torque screw fastener
US6402544B1 (en) * 1999-02-04 2002-06-11 B & H (Nottingham) Limited Electrical connector with idc screw
US6699062B1 (en) * 1999-11-10 2004-03-02 Tyco Electronics Uk Limited Insulation piercing fastener
USD669558S1 (en) 2011-06-13 2012-10-23 Fluidmaster, Inc. Fluid connector
US8911189B2 (en) 2013-02-26 2014-12-16 Apical Industries, Inc. Frangible fastener
US9303800B2 (en) 2010-11-12 2016-04-05 Fluidmaster, Inc. Torque limiting fluid connector system
US20160223005A1 (en) * 2013-07-30 2016-08-04 Robert Rathmann Fastener element for a fastening system, fastening tool, disengagement and testing of a fastener element, method for providing a fastening system with a closure seal and/or a torque indicator
US9702393B2 (en) 2014-10-01 2017-07-11 Hubbell Incorporated Pressure pad for screw and breakaway pressure screw
US9835192B2 (en) 2014-10-01 2017-12-05 Hubbell Incorporated Breakaway pressure screw
US10288105B2 (en) * 2015-08-18 2019-05-14 Sannohashi Corporation Bolt
CN110062604A (en) * 2016-10-10 2019-07-26 西特尼斯Ag Screwdriver with integrated torque protection
US10670068B2 (en) 2017-04-28 2020-06-02 Apical Industries, Inc. Frangible fastener system
US10760608B2 (en) 2013-12-02 2020-09-01 Hubbell Incorporated Electrical connector with shearable fastener
US11193522B2 (en) 2016-11-30 2021-12-07 3M Innovative Properties Company Shear bolt
US11519447B1 (en) * 2020-02-21 2022-12-06 Michael Payne Tamper proof plug

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2637361A (en) * 1951-06-25 1953-05-05 Charles E Nagel Self-locking setscrew
US3498174A (en) * 1968-11-19 1970-03-03 Hi Shear Corp Inherently torque-limited bolt having removal means
US3609657A (en) * 1969-10-07 1971-09-28 Square D Co Electrical connector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2637361A (en) * 1951-06-25 1953-05-05 Charles E Nagel Self-locking setscrew
US3498174A (en) * 1968-11-19 1970-03-03 Hi Shear Corp Inherently torque-limited bolt having removal means
US3609657A (en) * 1969-10-07 1971-09-28 Square D Co Electrical connector

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199216A (en) * 1975-01-23 1980-04-22 I-T-E Imperial Corp. Torque controlling set screw for use with the cable of solderless connectors, or the like
US3963322A (en) * 1975-01-23 1976-06-15 Ite Imperial Corporation Torque controlling set screw for use with the cable of solderless connectors, or the like
US4043369A (en) * 1976-03-11 1977-08-23 Abernethy Robert R Edge deformable lock nut
US4260005A (en) * 1977-11-09 1981-04-07 Vsi Corporation Self-locking fastener, fastener system, and process
US4149434A (en) * 1978-03-17 1979-04-17 Leroy Wilson Screw and screwdriver therefor
USD270229S (en) 1980-10-22 1983-08-23 The Eastern Company Tool and operator head for tool-operated lock
USD270424S (en) 1980-10-22 1983-09-06 The Eastern Company Tool operator for tool-operated locks
US4521146A (en) * 1982-11-08 1985-06-04 Maron Products, Inc. Lug nut cap
US4786224A (en) * 1986-04-24 1988-11-22 Maron Products, Inc. Wheel lug nut cover
US5438813A (en) * 1992-12-02 1995-08-08 A. P. Green Industries, Inc. Method for insulating walls of furnace
US5692419A (en) * 1993-03-04 1997-12-02 Air Industries Corporation Deformable locking fastener system and method of use
US5452974A (en) * 1993-03-04 1995-09-26 Air Industries Corporation Deformable locking fastener system and method of use
US6209424B1 (en) * 1994-03-15 2001-04-03 Sicame Electrical Developments Ltd. Clamping screws
US6321624B1 (en) 1994-03-15 2001-11-27 Sicame Electrical Developments Ltd. Apparatus for clamping screws
US6042430A (en) * 1995-04-07 2000-03-28 B & H (Nottingham) Limited Fastener
CN1059955C (en) * 1995-04-07 2000-12-27 B及H(诺丁汉)有限公司 Fastener
WO1996031706A1 (en) * 1995-04-07 1996-10-10 B & H (Nottingham) Limited Fastener
US6238155B1 (en) 1995-11-06 2001-05-29 Southco, Inc. Torque screw fastener
EP0779440A1 (en) * 1995-12-14 1997-06-18 Ford-Werke Aktiengesellschaft Drain bolt for a sheet metal container
EP0892462A2 (en) * 1997-07-16 1999-01-20 Harting KGaA Contact element with a connection for a stranded wire
EP0892462A3 (en) * 1997-07-16 2000-02-02 Harting KGaA Contact element with a connection for a stranded wire
US6402544B1 (en) * 1999-02-04 2002-06-11 B & H (Nottingham) Limited Electrical connector with idc screw
US6699062B1 (en) * 1999-11-10 2004-03-02 Tyco Electronics Uk Limited Insulation piercing fastener
US9303800B2 (en) 2010-11-12 2016-04-05 Fluidmaster, Inc. Torque limiting fluid connector system
USD669558S1 (en) 2011-06-13 2012-10-23 Fluidmaster, Inc. Fluid connector
US8911189B2 (en) 2013-02-26 2014-12-16 Apical Industries, Inc. Frangible fastener
US10100864B2 (en) * 2013-07-30 2018-10-16 Robert Rathmann Fastener element for a fastening system, fastening tool, disengagement and testing of a fastener element, method for providing a fastening system with a closure seal and/or a torque indicator
US20160223005A1 (en) * 2013-07-30 2016-08-04 Robert Rathmann Fastener element for a fastening system, fastening tool, disengagement and testing of a fastener element, method for providing a fastening system with a closure seal and/or a torque indicator
US10760608B2 (en) 2013-12-02 2020-09-01 Hubbell Incorporated Electrical connector with shearable fastener
US9702393B2 (en) 2014-10-01 2017-07-11 Hubbell Incorporated Pressure pad for screw and breakaway pressure screw
US9835192B2 (en) 2014-10-01 2017-12-05 Hubbell Incorporated Breakaway pressure screw
US10288105B2 (en) * 2015-08-18 2019-05-14 Sannohashi Corporation Bolt
CN110062604A (en) * 2016-10-10 2019-07-26 西特尼斯Ag Screwdriver with integrated torque protection
US11583325B2 (en) * 2016-10-10 2023-02-21 Syntellix Ag Screw drive having integrated torque security
US11193522B2 (en) 2016-11-30 2021-12-07 3M Innovative Properties Company Shear bolt
US10670068B2 (en) 2017-04-28 2020-06-02 Apical Industries, Inc. Frangible fastener system
US11519447B1 (en) * 2020-02-21 2022-12-06 Michael Payne Tamper proof plug

Also Published As

Publication number Publication date
CA1002797A (en) 1977-01-04

Similar Documents

Publication Publication Date Title
US3865007A (en) Torque determining allen screw
EP0191245B1 (en) Double end stud
US4125051A (en) Tamperproof fastener
US4970922A (en) Torque driving tool and retainer for driven member
US4498825A (en) Load indicating flange
US4666055A (en) Electrical outlet box with polygonal mounting bore
US3711138A (en) Fastening devices
US3842877A (en) Quick fastening screw device
US20030091407A1 (en) Insert nut for a screw nut joint
US4627774A (en) Limiting torque bolt-nut assembly
JPH11114844A (en) Operation tool for fixture having inside polygonal structure, particularly, screw
US4228723A (en) Fastener recess
US3695059A (en) Adjustable torque limiting coupling
KR930700782A (en) Locking fastener
US4029379A (en) Electrical bus duct with torque indication nut
US3914832A (en) Worm gear clamping apparatus
US5431453A (en) Pipe coupling arrangement
US5391033A (en) Nut lock
SE538884C2 (en) Compression wedge for a lead-through system
US4637641A (en) Assembly means for standardized mechanical joint for pipeline appurtenances
US3674075A (en) Tamper-proof two-way locking nut
US4309140A (en) Self-locking threaded fastener and unlocking tool combination
US4738168A (en) Wrench
JPS6224091A (en) Pipe joint
US3023797A (en) Interrupted thread bolt and bushing with stop and radially sliding lock means