US2826631A - Overheat switch insulator lock nut - Google Patents

Overheat switch insulator lock nut Download PDF

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Publication number
US2826631A
US2826631A US467181A US46718154A US2826631A US 2826631 A US2826631 A US 2826631A US 467181 A US467181 A US 467181A US 46718154 A US46718154 A US 46718154A US 2826631 A US2826631 A US 2826631A
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United States
Prior art keywords
nut
insert
shell
switch
stud
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Expired - Lifetime
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US467181A
Inventor
Frederick W Rohe
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Signal Oil and Gas Co
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Signal Oil and Gas 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
Priority to US24753D priority Critical patent/USRE24753E/en
Application filed by Signal Oil and Gas Co filed Critical Signal Oil and Gas Co
Priority to US467181A priority patent/US2826631A/en
Application granted granted Critical
Publication of US2826631A publication Critical patent/US2826631A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16B37/00—Nuts or like thread-engaging members
    • 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
    • F16B33/00—Features common to bolt and nut
    • F16B33/004—Sealing; Insulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/924—Coupled nut and bolt
    • Y10S411/929—Thread lock
    • Y10S411/937—Distorted nut

Definitions

  • This invention relates to an insulator nut for over-heat switch as such as are used in various locations in airplanes, and for other uses where dielectric properties are advantageous.
  • the general object of the invention is to provide a nut which will serve as a cover for a normally exposed stud of such a switch or other device.
  • Another object is to provide such a cover nut having dielectric means to fully shield any object coming into proximity therewith, against grounding the device on which the nut is threaded, or otherwise establishing electrical contact therewith.
  • Another object is to provide a nut having an exceptionally high corrosion resistance.
  • a further object is to provide such a cover nut having means to lock it securely to a threaded stud, to the end that the nut may not come loose under the effect of vibration.
  • Another object is to provide such a nut having means to prevent galling of its threads on the threads of an overheat switch, when the nut is being turned at high temperatures.
  • Fig. 1 is a side view, partially in axial section, of a nut embodying the invention
  • Fig. 2 is a front end view thereof
  • Fig. 3 is a rear end view thereof
  • Fig. 4 is a transverse sectional view taken on the line 44 of Fig. 1;
  • Fig. 5 is a transverse sectional view taken on the line S5 of Fig. 1.
  • my improved switch cover nut is of composite structure, embodying a shell A and an internally threaded insert B, press-fitted therein.
  • Shell A includes a cylindrical barrel 6, an inturned flange 7 at one end thereof, defining a circular opening 8, and a rib 9 projecting radially outwardly from its other end.
  • Insert B comprises a cylindrical body 10 contained within shell A, having a cylindrical outer wall press fitted to the cylindrical inner wall of shell A and having a forward end abutted against end flange 7 of the shell.
  • Body 10 has a bore 11 which is provided with an internal thread 12 extending from said forward end to a point somewhat beyond the center of the body.
  • the base diameter of thread 12 is substantially the same as the diameter of opening 8.
  • body 10 has a reduced thickness portion 13 which defines a socket 14 of polygonal cross-sectional contour, providing wrenching faces for mating with a wrench used in turning the nut.
  • Shell A is completely covered, On its external surfaces, with a dielectric ceramic coating 15, which shields any external object coming in contact with the nut, from electrical connection with the overheat switch and, conversely, shields the switch from being shorted by any conductor contacting the nut.
  • a dielectric ceramic coating 15 which shields any external object coming in contact with the nut, from electrical connection with the overheat switch and, conversely, shields the switch from being shorted by any conductor contacting the nut.
  • the nut itself functions as an insulator covering for the switch.
  • the interior of body 10 is silver plated to eliminate galling of thread 12 when the nut is being rotated on a switch element of the same material as the nut body 10, at high temperature.
  • the forward end of nut body 10 has a thinned neck portion 16, defining the bottom of an annular external groove 17.
  • Neck portion 16 is ovalated (deformed under pressure to an oval cross section as indicated in Fig. 5) whereby to provide a thread lock to bind the nut securely to the switch element, resisting any tendency to come loose under the effect of vibration.
  • the opening 8 provides for passage of the threaded stud of an overhead switch through the shell A for threading into threaded portion 12 of bore 11.
  • Socket 14 coacts with an Allen wrench for driving the nut onto the switch stud or removing it.
  • the rear end of nut insert B is recessed inwardly from the end face of rim 15, to minimize the possibility of accidental contact between any external object and the insert.
  • the ceramic coating completely covering the external surfaces of the nut, provides a greatly improved resistance to corrosion, even in the presence of highly corrosive fluids (such as the atmosphere in the vicinity of a large body of salt water).
  • an insert having an axial bore, internally threaded at one end of the nut for reception of and threaded connection with a threaded stud of an overheat switch, and having a wrenching socket at the other end of the nut; a shell including a tubular body receiving and press-fitted upon said insert, including an annular inturned flange at said one end of the nut, covering the adjacent end of said insert, and including a radially outwardly extending rim at said other end of the nut, said inturned flange defining an end opening through which said stud may be received; and a coating of insulating material covering the external surfaces of said shell, to constitute the nut an insulating cover for said switch stud; said insert, at said one end of the nut, having an annular external groove and a reduced thickness neck portion defining the bottom of said groove, said neck portion being of oval cross-section to provide a thread lock for locking the nut against rotation on said stud; said shell body
  • an overheat switch insulator nut a cylindrical insert having an axial bore, internally threaded at one end of the nut for reception of and threaded connection with a threaded stud of an overheat switch, and having a wrench socket at the other end of the nut; a shell in cluding a cylindrical tubular body receiving and pressfitted upon said insert, including an annular inturned flange at said one end of the nut, said inturned flange covering the adjacent end of the insert and defining an opening of approximately the same diameter as said thread, for reception of said threaded stud and said shell including a radially outwardly extending rim at said other end of the nut; and a coating of insulating material covering and restricted to the external surfaces of said shell, to constitute the nut an insulating cover for said switch stud; said shell constituting a base for said insulating coating.
  • an insert having an axial bore, internally threaded at one end of the nut for reception of and threaded connection with a threaded stud of an overheat switch, and having a wrenching socket at the other end of the nut; a shell including a tubular body receiving and press-fitted upon said insert, including an annular inturned flange at said one end of the nut, covering the adjacent end of said insert, and including a radially outwardly extending rim at said other 'end of the nut, said inturned flange defining an end opening through Which said stud may be received; and a coating of insulating material covering the external surfaces of said shell, to constitute the nut an insulating cover for said switch stud; said insert, at said one of the nut, having an annular external groove and a reduced thickness neck portion defining the bottom of said groove, said neck portion being of non-circular cross-section to provide a thread lock for locking the nut against rotation on said stud
  • an insert having an axial bore, internally threaded at one end of the nut for reception of and threaded connection With a threaded stud of an overheat switch, and having a wrench-- ing socket at the other end of the nut; a shell including a tubular body receiving and press-fitted upon said insert, including an annular inturned flange at said one end of the nut, covering the adjacent end of said insert, said in- 20 turned flange defining an end opening through which said stud may be received; and a coating of insulating material covering the external surfaces of said shell, to constitute the nut an insulating cover for said switch stud; said insert, at said one end of the nut, having an annular external groove and a reduced thickness neck portion defining the bottom of said groove, said neck portion being of non-circular cross-section to provide a thread lock for locking the nut against rotation on said stud; said shell body covering and bridging across said groove and providing support for the sections of

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Description

March 11, 1958 F. w. ROHE 2,826,631
QVERHEAT SWITCH INSULATOR LOCK NUT Filed Nov. 5, 1954 INVENTOR. ffez pzzlcx M E0115 -A Z'TOPJVEY- nited States PatentDfiice 2,826,631 Patented Mar. 11, 1958 OVERHEAT SWITCH INSULATOR LOCK NUT Frederick W. Roh, Los Angeles, Calif., assignor, by mesne assignments, to Signal Oil and Gas Company, a corporation Application November 5, 1954, Serial No. 467,181
4 Claims. (Cl. 174138) This invention relates to an insulator nut for over-heat switch as such as are used in various locations in airplanes, and for other uses where dielectric properties are advantageous. The general object of the invention is to provide a nut which will serve as a cover for a normally exposed stud of such a switch or other device.
Another object is to provide such a cover nut having dielectric means to fully shield any object coming into proximity therewith, against grounding the device on which the nut is threaded, or otherwise establishing electrical contact therewith.
Another object is to provide a nut having an exceptionally high corrosion resistance.
A further object is to provide such a cover nut having means to lock it securely to a threaded stud, to the end that the nut may not come loose under the effect of vibration.
Another object is to provide such a nut having means to prevent galling of its threads on the threads of an overheat switch, when the nut is being turned at high temperatures.
Other objects will become apparent in the ensuing specifications and appended drawings in which:
Fig. 1 is a side view, partially in axial section, of a nut embodying the invention;
Fig. 2 is a front end view thereof;
Fig. 3 is a rear end view thereof;
Fig. 4 is a transverse sectional view taken on the line 44 of Fig. 1; and
Fig. 5 is a transverse sectional view taken on the line S5 of Fig. 1.
Referring now to the drawings in detail, my improved switch cover nut is of composite structure, embodying a shell A and an internally threaded insert B, press-fitted therein.
Shell A includes a cylindrical barrel 6, an inturned flange 7 at one end thereof, defining a circular opening 8, and a rib 9 projecting radially outwardly from its other end.
Insert B comprises a cylindrical body 10 contained within shell A, having a cylindrical outer wall press fitted to the cylindrical inner wall of shell A and having a forward end abutted against end flange 7 of the shell. Body 10 has a bore 11 which is provided with an internal thread 12 extending from said forward end to a point somewhat beyond the center of the body. The base diameter of thread 12 is substantially the same as the diameter of opening 8. At its rear end, body 10 has a reduced thickness portion 13 which defines a socket 14 of polygonal cross-sectional contour, providing wrenching faces for mating with a wrench used in turning the nut.
Shell A is completely covered, On its external surfaces, with a dielectric ceramic coating 15, which shields any external object coming in contact with the nut, from electrical connection with the overheat switch and, conversely, shields the switch from being shorted by any conductor contacting the nut. Thus the nut itself functions as an insulator covering for the switch.
The interior of body 10 is silver plated to eliminate galling of thread 12 when the nut is being rotated on a switch element of the same material as the nut body 10, at high temperature.
The forward end of nut body 10 has a thinned neck portion 16, defining the bottom of an annular external groove 17. Neck portion 16 is ovalated (deformed under pressure to an oval cross section as indicated in Fig. 5) whereby to provide a thread lock to bind the nut securely to the switch element, resisting any tendency to come loose under the effect of vibration.
The opening 8 provides for passage of the threaded stud of an overhead switch through the shell A for threading into threaded portion 12 of bore 11. Socket 14 coacts with an Allen wrench for driving the nut onto the switch stud or removing it. The rear end of nut insert B is recessed inwardly from the end face of rim 15, to minimize the possibility of accidental contact between any external object and the insert.
The ceramic coating, completely covering the external surfaces of the nut, provides a greatly improved resistance to corrosion, even in the presence of highly corrosive fluids (such as the atmosphere in the vicinity of a large body of salt water).
I claim:
1. In an overheat switch insulator nut: an insert having an axial bore, internally threaded at one end of the nut for reception of and threaded connection with a threaded stud of an overheat switch, and having a wrenching socket at the other end of the nut; a shell including a tubular body receiving and press-fitted upon said insert, including an annular inturned flange at said one end of the nut, covering the adjacent end of said insert, and including a radially outwardly extending rim at said other end of the nut, said inturned flange defining an end opening through which said stud may be received; and a coating of insulating material covering the external surfaces of said shell, to constitute the nut an insulating cover for said switch stud; said insert, at said one end of the nut, having an annular external groove and a reduced thickness neck portion defining the bottom of said groove, said neck portion being of oval cross-section to provide a thread lock for locking the nut against rotation on said stud; said shell body covering and bridging across said groove and supporting the sections of said shell body on opposite sides of said groove.
2. In an overheat switch insulator nut: a cylindrical insert having an axial bore, internally threaded at one end of the nut for reception of and threaded connection with a threaded stud of an overheat switch, and having a wrench socket at the other end of the nut; a shell in cluding a cylindrical tubular body receiving and pressfitted upon said insert, including an annular inturned flange at said one end of the nut, said inturned flange covering the adjacent end of the insert and defining an opening of approximately the same diameter as said thread, for reception of said threaded stud and said shell including a radially outwardly extending rim at said other end of the nut; and a coating of insulating material covering and restricted to the external surfaces of said shell, to constitute the nut an insulating cover for said switch stud; said shell constituting a base for said insulating coating.
3. In an overheat switch insulator nut: an insert having an axial bore, internally threaded at one end of the nut for reception of and threaded connection with a threaded stud of an overheat switch, and having a wrenching socket at the other end of the nut; a shell including a tubular body receiving and press-fitted upon said insert, including an annular inturned flange at said one end of the nut, covering the adjacent end of said insert, and including a radially outwardly extending rim at said other 'end of the nut, said inturned flange defining an end opening through Which said stud may be received; and a coating of insulating material covering the external surfaces of said shell, to constitute the nut an insulating cover for said switch stud; said insert, at said one of the nut, having an annular external groove and a reduced thickness neck portion defining the bottom of said groove, said neck portion being of non-circular cross-section to provide a thread lock for locking the nut against rotation on said stud; said shell body covering and bridging across said groove and providing support for the sections of said insert on opposite sides of said groove.
4. In an overheat switch insulator nut: an insert having an axial bore, internally threaded at one end of the nut for reception of and threaded connection With a threaded stud of an overheat switch, and having a wrench-- ing socket at the other end of the nut; a shell including a tubular body receiving and press-fitted upon said insert, including an annular inturned flange at said one end of the nut, covering the adjacent end of said insert, said in- 20 turned flange defining an end opening through which said stud may be received; and a coating of insulating material covering the external surfaces of said shell, to constitute the nut an insulating cover for said switch stud; said insert, at said one end of the nut, having an annular external groove and a reduced thickness neck portion defining the bottom of said groove, said neck portion being of non-circular cross-section to provide a thread lock for locking the nut against rotation on said stud; said shell body covering and bridging across said groove and providing support for the sections of said insert on opposite sides of said groove.
References Cited in the file of this patent UNITED STATES PATENTS 332,540 Law Dec. 15, 1885 375,294 Johns Dec. 20, 1887 2,385,991 Huntoon Oct. 2, 1945 FOREIGN PATENTS 665,544 Great Britain Jan. 23, 1952
US467181A 1954-11-05 1954-11-05 Overheat switch insulator lock nut Expired - Lifetime US2826631A (en)

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Application Number Priority Date Filing Date Title
US24753D USRE24753E (en) 1954-11-05 Overheat switch insulator lock nut
US467181A US2826631A (en) 1954-11-05 1954-11-05 Overheat switch insulator lock nut

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US467181A US2826631A (en) 1954-11-05 1954-11-05 Overheat switch insulator lock nut

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1202463B (en) * 1960-01-04 1965-10-07 Frederick W Rohe Device for attaching objects to composite panels with cover panels made of metal
US3233504A (en) * 1962-04-02 1966-02-08 Monogram Ind Inc Clamping device with reversed thread arrangement
US4322195A (en) * 1979-08-31 1982-03-30 Russell, Burdsall & Ward Corporation Lug nut
US5405404A (en) * 1993-10-07 1995-04-11 Intermedics Orthopedics, Inc. Instrument for disassembling a bipolar hip prosthesis
US20080226416A1 (en) * 2007-03-12 2008-09-18 Benns Michael J Anti-Rotation Device
US20110188968A1 (en) * 2007-11-21 2011-08-04 Guangdong Fuwa Engineering Manufacturing Co., Ltd. Semi-Trailer Support Loading Nut
US20160010678A1 (en) * 2013-02-28 2016-01-14 Illinois Tool Works Inc. Method for manufacturing a nut by the progressive press forging of a laminar metal sheet and resulting nut
USD789187S1 (en) * 2014-12-02 2017-06-13 Baldor Electric Company Coupling
US20170275019A1 (en) * 2012-03-29 2017-09-28 The Boeing Company Fastener systems that provide eme protection
USD835978S1 (en) * 2016-12-22 2018-12-18 Yamashina Corporation Nut
US10214862B2 (en) * 2014-04-17 2019-02-26 Ningbo Shuxiang New Material Co., Ltd Casing tube and manufacturing method thereof
US11168727B2 (en) * 2016-05-27 2021-11-09 Mafi Ab Attachment device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065983A (en) * 1959-12-21 1962-11-27 Columbus Auto Parts Self-locking threaded connecting member
US5860779A (en) * 1997-11-26 1999-01-19 Mcdonnell Douglas Corporation Locking nut
US9175710B2 (en) * 2013-12-19 2015-11-03 Varian Semiconductor Equipment Associates, Inc Contained ceramic fastener

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US332540A (en) * 1885-12-15 Nut-lock
US375294A (en) * 1887-12-20 James
US2385991A (en) * 1943-09-14 1945-10-02 Solar Aircraft Co Anchor nut
GB665544A (en) * 1947-12-15 1952-01-23 Gordon Spencer Marston Improvements in or relating to insulated nuts

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US332540A (en) * 1885-12-15 Nut-lock
US375294A (en) * 1887-12-20 James
US2385991A (en) * 1943-09-14 1945-10-02 Solar Aircraft Co Anchor nut
GB665544A (en) * 1947-12-15 1952-01-23 Gordon Spencer Marston Improvements in or relating to insulated nuts

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1202463B (en) * 1960-01-04 1965-10-07 Frederick W Rohe Device for attaching objects to composite panels with cover panels made of metal
US3233504A (en) * 1962-04-02 1966-02-08 Monogram Ind Inc Clamping device with reversed thread arrangement
US4322195A (en) * 1979-08-31 1982-03-30 Russell, Burdsall & Ward Corporation Lug nut
US5405404A (en) * 1993-10-07 1995-04-11 Intermedics Orthopedics, Inc. Instrument for disassembling a bipolar hip prosthesis
US20080226416A1 (en) * 2007-03-12 2008-09-18 Benns Michael J Anti-Rotation Device
US8622677B2 (en) * 2007-11-21 2014-01-07 Guangdong Fuwa Engineering Manufacturing Co., Ltd. Semi-trailer support loading nut
US20110188968A1 (en) * 2007-11-21 2011-08-04 Guangdong Fuwa Engineering Manufacturing Co., Ltd. Semi-Trailer Support Loading Nut
US20170275019A1 (en) * 2012-03-29 2017-09-28 The Boeing Company Fastener systems that provide eme protection
US20160010678A1 (en) * 2013-02-28 2016-01-14 Illinois Tool Works Inc. Method for manufacturing a nut by the progressive press forging of a laminar metal sheet and resulting nut
US9689420B2 (en) * 2013-02-28 2017-06-27 Illinois Tool Works Inc. Method for manufacturing a nut by the progressive press forging of a laminar metal sheet and resulting nut
US10214862B2 (en) * 2014-04-17 2019-02-26 Ningbo Shuxiang New Material Co., Ltd Casing tube and manufacturing method thereof
USD789187S1 (en) * 2014-12-02 2017-06-13 Baldor Electric Company Coupling
US11168727B2 (en) * 2016-05-27 2021-11-09 Mafi Ab Attachment device
USD835978S1 (en) * 2016-12-22 2018-12-18 Yamashina Corporation Nut

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