US1946860A - Self locking thread system - Google Patents

Self locking thread system Download PDF

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Publication number
US1946860A
US1946860A US606498A US60649832A US1946860A US 1946860 A US1946860 A US 1946860A US 606498 A US606498 A US 606498A US 60649832 A US60649832 A US 60649832A US 1946860 A US1946860 A US 1946860A
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United States
Prior art keywords
thread
normal
bolt
nut
self locking
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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
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US606498A
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Kielland Jakob De Rytter
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Individual
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    • 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
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G3/00—Belt fastenings, e.g. for conveyor belts
    • F16G3/006—Traction devices to bring together belts, cables or chains
    • 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
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/30—Locking exclusively by special shape of the screw-thread
    • 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

Definitions

  • the present invention relates to a thread system, which is so formed, that a selflocking action is obtained between the two threaded parts (bolt and nut) when the nut is pulled into engagement with the abutting surface.
  • the characteristic feature of the present thread system lies in the use in connection with a normally threaded member (bolt or nut) of another cooperating member (nut, bolt) the thread of which is formed by combining two normal threads with diierent bottom diameter, said threads being axially displaced with regard to each other a fraction of one full pitch of the thread.
  • the prole height of the thread of the latter part will accordingly be reduced with regard to the normal thread profile and one of the inclined side surfaces of the thread will be stepped from the bottom of the deepest thread and upwards.
  • Fig. l illustrates the development of the thread system by means of an axial section through the thread.
  • Fig. 2 is an axial seetion on a smaller scale through a normally threaded bolt and a nut provided with the modified thread.
  • the curve 1 shows the cross section o! a normal thread
  • the curve'2 shows the thread profile after one of the side surfaces of the normal thread has been machined away in accordance with the invention.
  • the thread proille obtained in this manner is defined by a curve which passes from point 3, which is the deepest point of the normal thread,
  • ⁇ over an abutment 5 tothe point 4, which forms the bottom of the axially displaced shallower thread threads, may be more or less rounded ofi in order to not a'ord too much resistance against the displacement of the thread of the other member oi the system from the bottom of the deepest to the bottom of the shallowest thread. lI'he connection co between the two thread bottoms will then be formed by a curved surface, which will be inclined somewhat towards the axis of the thread adjacent the bottom of the shallowest thread.
  • the dotted line 6 indicates the radially and e5 axially displaced normal thread, which forms together with the normal thread 1 the modified thread profile in accordance with the present invention.
  • a self-locking nut having a thread the pronle of which is formed by the superposition of two normal thread proveshaving difierent bottom diameters and being axially displaced with regard to each other a fraction of a iull pitch of the thread whereby a stepped -suriace is obtained upon one side of the modified thread.
  • a nut as claimed in claim 1 in which the connecting surface between the different thread bottoms of the modifled thread is formed as a continuous curved surface which is inclined with respect to the ans of the thread adjacent the shallowest thread bottom.

Description

Feb. 13,l 1934. J. DE RVKIELLAND 1,946,860
Filed April 20, 1932- Patented Feb. 13, 1934 PATENT OFFICE SELF Loexme THREAD srsrEM Jakob de Rytter Kielland, Vinderen, near 0510. Norway Application April 20, 1932, Serial No. 606,498, and in Norway May Z7, 1931 The present invention relates to a thread system, which is so formed, that a selflocking action is obtained between the two threaded parts (bolt and nut) when the nut is pulled into engagement with the abutting surface.
. The characteristic feature of the present thread system lies in the use in connection with a normally threaded member (bolt or nut) of another cooperating member (nut, bolt) the thread of which is formed by combining two normal threads with diierent bottom diameter, said threads being axially displaced with regard to each other a fraction of one full pitch of the thread. The prole height of the thread of the latter part will accordingly be reduced with regard to the normal thread profile and one of the inclined side surfaces of the thread will be stepped from the bottom of the deepest thread and upwards.
When the part which is provided with a combined thread of this description is used together with a normally threaded member, the edge of the normal thread during the engagement between the threads and the abutment will be pressed axially from the deepest part of the modified thread over to the step which is formed by the 'bottom part of the shallower thread, whereby the two threaded members are automatically locked against relative movement. I
On the drawing Fig. lillustrates the development of the thread system by means of an axial section through the thread. Fig. 2 is an axial seetion on a smaller scale through a normally threaded bolt and a nut provided with the modified thread.
On Fig. 1 the curve 1 shows the cross section o! a normal thread, whereas the curve'2 shows the thread profile after one of the side surfaces of the normal thread has been machined away in accordance with the invention.
The thread proille obtained in this manner is defined by a curve which passes from point 3, which is the deepest point of the normal thread,
` over an abutment 5 tothe point 4, which forms the bottom of the axially displaced shallower thread threads, may be more or less rounded ofi in order to not a'ord too much resistance against the displacement of the thread of the other member oi the system from the bottom of the deepest to the bottom of the shallowest thread. lI'he connection co between the two thread bottoms will then be formed by a curved surface, which will be inclined somewhat towards the axis of the thread adjacent the bottom of the shallowest thread.
The dotted line 6 indicates the radially and e5 axially displaced normal thread, which forms together with the normal thread 1 the modified thread profile in accordance with the present invention.
From Fig. 2 it will be seen that the bolt 7 is 70 provided with a normal thread of the Whitworth type, whereas the nut 8 is provided with the modified thread which is indicated by the curve 3, 5,
4, 2 on Fig. 1. When the nut 8 is threaded along the bolt and abuts against the fixed surface 9, it will be displaced axially with regard to the bolt until it arrives in the position illustrated on Fig.
2, in which the exterior edge of the normal thread of bolt 7 rests in the stepped part of the modified thread of nt `8. Instead oi.' using a modified a0 thread, the cross section of which is composed of two axially displaced normal threads with difierent bottom diameter, one `may also use 3 or 4 combined normal thread systems, so as to obtain several steps in the bottom of the thread.
I claim:
1. In combination with a normal or standard thread bolt, a self-locking nut having a thread the pronle of which is formed by the superposition of two normal thread proiileshaving difierent bottom diameters and being axially displaced with regard to each other a fraction of a iull pitch of the thread whereby a stepped -suriace is obtained upon one side of the modified thread.-
2. A nut as claimed in claim 1 in which the connecting surface between the different thread bottoms of the modifled thread is formed as a continuous curved surface which is inclined with respect to the ans of the thread adjacent the shallowest thread bottom.
JAKOB Dl RYITER mLLAND.
US606498A 1931-05-27 1932-04-20 Self locking thread system Expired - Lifetime US1946860A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO387133X 1931-05-27

Publications (1)

Publication Number Publication Date
US1946860A true US1946860A (en) 1934-02-13

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US606498A Expired - Lifetime US1946860A (en) 1931-05-27 1932-04-20 Self locking thread system

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US (1) US1946860A (en)
BE (1) BE387878A (en)
DE (1) DE567708C (en)
FR (1) FR734455A (en)
GB (1) GB387133A (en)
NL (1) NL33184C (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751238A (en) * 1952-07-02 1956-06-19 Conrad R Vegren Quick acting connector
US4389145A (en) * 1981-08-31 1983-06-21 Russell, Burdsall & Ward Corporation Method of tapping dual thread fasteners
US4432682A (en) * 1978-12-04 1984-02-21 Microdot Inc. Threaded fastener assembly
US4586861A (en) * 1978-11-06 1986-05-06 Microdot Inc. Convex wedge ramp thread configuration
US4734002A (en) * 1986-07-11 1988-03-29 Holmes Horace D Locking thread form for male fastener
US7682120B1 (en) * 2006-09-05 2010-03-23 Harold Goldbaum Positive locking machine screw mechanism
US8382415B1 (en) 2006-09-05 2013-02-26 Harold Goldbaum Rapid-engaging and positive-locking threaded configuration

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1051329A (en) * 1975-10-08 1979-03-27 Horace D. Holmes Locking thread construction

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751238A (en) * 1952-07-02 1956-06-19 Conrad R Vegren Quick acting connector
US4586861A (en) * 1978-11-06 1986-05-06 Microdot Inc. Convex wedge ramp thread configuration
US4432682A (en) * 1978-12-04 1984-02-21 Microdot Inc. Threaded fastener assembly
US4389145A (en) * 1981-08-31 1983-06-21 Russell, Burdsall & Ward Corporation Method of tapping dual thread fasteners
US4734002A (en) * 1986-07-11 1988-03-29 Holmes Horace D Locking thread form for male fastener
US7682120B1 (en) * 2006-09-05 2010-03-23 Harold Goldbaum Positive locking machine screw mechanism
US8382415B1 (en) 2006-09-05 2013-02-26 Harold Goldbaum Rapid-engaging and positive-locking threaded configuration

Also Published As

Publication number Publication date
NL33184C (en)
DE567708C (en) 1933-01-09
BE387878A (en)
GB387133A (en) 1933-02-02
FR734455A (en) 1932-10-22

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