GB2136080A - Self locking screw connection - Google Patents

Self locking screw connection Download PDF

Info

Publication number
GB2136080A
GB2136080A GB08405489A GB8405489A GB2136080A GB 2136080 A GB2136080 A GB 2136080A GB 08405489 A GB08405489 A GB 08405489A GB 8405489 A GB8405489 A GB 8405489A GB 2136080 A GB2136080 A GB 2136080A
Authority
GB
United Kingdom
Prior art keywords
screw thread
slot
protrusion
stud
external screw
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.)
Withdrawn
Application number
GB08405489A
Other versions
GB8405489D0 (en
Inventor
Herbert Kussinger
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.)
Schaltbau GmbH
Original Assignee
Schaltbau GmbH
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 Schaltbau GmbH filed Critical Schaltbau GmbH
Publication of GB8405489D0 publication Critical patent/GB8405489D0/en
Publication of GB2136080A publication Critical patent/GB2136080A/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F16B39/38—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 with a second part of the screw-thread which may be resiliently mounted

Abstract

A self locking screw connection assembly comprises a tubular body 1 with a bore having an internal screw thread 2 and a body with an external screw thread 7 fitting the internal screw thread, the tubular body 1 being provided, near one end of the tube, around a portion of its periphery, with a slot 4 which communicates with the bore, the portion of the tubular body between the slot and the tube end being elastically deformable by a stud-like protrusion 5 which is present on the end face of the tube end in a sector in the region of the slot and abuts housing 9 so as to distort the elastically deformable portion of the tubular body upon tightening of head 8 of body 7 against housing 9, thus providing a locking action. The connection so formed is preferably rotation resistant. <IMAGE>

Description

SPECIFICATION Screw connection assembly This invention relates to a screw connection assembly comprising a tubular body with a bore having an internal screw thread and a body with an external screw thread fitting the internal screw thread.
Screw connection assemblies as mentioned above are used frequently in installation work, especially electrical installation work, e.g. in providing cables and lines with plug means or in the installation of other equipment such as lamp holders, Also, ducts passing through building walls, for example plug components passing through walls, can be fastened to the walls by means of the screw connection assemblies in question. In these screw connection assemblies, however, there is a requirement for ease of movement when the parts are screwed together which is not easily reconciled with the requirement for a certain resistance of the screw connection against loosening. It is known for example when screw threaded outer housings of lamp holders are fastened on tubes with an external screw thread to fix the screw threaded components together by means of screw-threaded locking members.However, this necessitates an appreciable additional outlay in respect of production and assembly. It is also known to ensure by a suitable choice of materials and by suitable design that in the last turn the screw thread of one component will cut easily into the body of the other, thus causing the screw threaded components to be fixed relative to one another to a certain extent. However, this solution is not suitable for those screw connections which are frequently released and reconnected, because the repeated cutting actions finally reduce below the limit of effectiveness the friction between the screw threaded components which is necessary for satisfactory retention.
It is an object of the present invention to provide a screw connection assembly which offers both ease of movement when the components are screwed together and sufficiently secure retention of the components thereafter, which can be produced economicaily and which can be fitted and removed without undue additional effort.
The present invention provides a screw connection assembly comprising a tubular body with a bore having an internal screw thread and a body with an external screw thread fitting the internal screw thread, wherein: the tubular body is provided, beside one end of the tube, around a portion of its periphery, with a slot which also represents a cut-away portion in the internal screw thread, the dimensions of the slot being such that the tubular portion between the slot and the said tube end is elastically deformable; a stud-like protrusion is present on the end face of the said tube end in a sector in the region of the slot; and the body with the external screw thread has a head which extends transversely with respect to the screw thread axis and which the stud-like protrusion directly or indirectly opposes when the two bodies are screwed together.
As soon as the stud-like protrusion opposes (directly or indirectly) the said head, the portion of the tubular body between the stud-like protrusion and the slot is stressed in such a sense as to ensure the fixing of the two bodies. This means that there is a considerable improvement in the security of connection of these bodies.
The present construction is suitable for use in fixing various components, e.g. ducts or plug components, in walls of housings. Thus the studlike protrusion can be made to meet one side of a wall of a housing, when the two bodies are screwed together, the body with an external screw thread passing through a bore in that wall, and the head provided on that body abutting against the other side of that wall. For the sake of secure fixing, it is recommended that the wall of the housing and the body with the external screw thread should abut against one another in a rotation-resistant manner.
It is a particular advantage of the present construction that the connection of the two screw threaded bodies is considerably improved, yet they can be released with only a slight extra exertion of torsional force.
In the accompanying diagrammatic drawing, the single Figure shows, in a partially cut away side view, one embodiment of the invention.
In the Figure, 1 denotes a tubular body with a bore, which has an internal screw thread 2. Near the tube end 3, the body 1 is provided with a slot 4 which represents a cut-away portion in the internal screw thread 2. Furthermore, a stud-like protrusion 5 is provided on the end face of the tube end 3, in a sector in the region of the slot 4. A body 6 forms the other part of the screw connection assembly, and has an external screw thread 7 and a head 8. When the body 6 and the body 1 have been screwed into one another, e.g.
after the body 6 has been passed through an aperture in a wall (shown at 9 in broken lines), the stud-like protrusion 5 comes up against the head 8, or against the side of the wall 9 facing it. The protrusion 5 then exerts a force in the longitudinal direction of body 1. This force causes the internal screw thread 2 to be deformed, between the studlike protrusion 5 and the slot 4, and consequently causes it to engage the external screw thread 7 more securely than would be possible without the stud-like protrusion 5 and the slot 4.
1. A screw connection assembly comprising a tubular body with a bore having an internal screw thread and a body with an external screw thread fitting the internal screw thread, wherein: the tubular body is provided, beside one end of the tube, around a portion of its periphery, with a slot which also represents a cut-away portion in the internal screw thread, the dimensions of the slot being such that the tubular portion between the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Screw connection assembly This invention relates to a screw connection assembly comprising a tubular body with a bore having an internal screw thread and a body with an external screw thread fitting the internal screw thread. Screw connection assemblies as mentioned above are used frequently in installation work, especially electrical installation work, e.g. in providing cables and lines with plug means or in the installation of other equipment such as lamp holders, Also, ducts passing through building walls, for example plug components passing through walls, can be fastened to the walls by means of the screw connection assemblies in question. In these screw connection assemblies, however, there is a requirement for ease of movement when the parts are screwed together which is not easily reconciled with the requirement for a certain resistance of the screw connection against loosening. It is known for example when screw threaded outer housings of lamp holders are fastened on tubes with an external screw thread to fix the screw threaded components together by means of screw-threaded locking members.However, this necessitates an appreciable additional outlay in respect of production and assembly. It is also known to ensure by a suitable choice of materials and by suitable design that in the last turn the screw thread of one component will cut easily into the body of the other, thus causing the screw threaded components to be fixed relative to one another to a certain extent. However, this solution is not suitable for those screw connections which are frequently released and reconnected, because the repeated cutting actions finally reduce below the limit of effectiveness the friction between the screw threaded components which is necessary for satisfactory retention. It is an object of the present invention to provide a screw connection assembly which offers both ease of movement when the components are screwed together and sufficiently secure retention of the components thereafter, which can be produced economicaily and which can be fitted and removed without undue additional effort. The present invention provides a screw connection assembly comprising a tubular body with a bore having an internal screw thread and a body with an external screw thread fitting the internal screw thread, wherein: the tubular body is provided, beside one end of the tube, around a portion of its periphery, with a slot which also represents a cut-away portion in the internal screw thread, the dimensions of the slot being such that the tubular portion between the slot and the said tube end is elastically deformable; a stud-like protrusion is present on the end face of the said tube end in a sector in the region of the slot; and the body with the external screw thread has a head which extends transversely with respect to the screw thread axis and which the stud-like protrusion directly or indirectly opposes when the two bodies are screwed together. As soon as the stud-like protrusion opposes (directly or indirectly) the said head, the portion of the tubular body between the stud-like protrusion and the slot is stressed in such a sense as to ensure the fixing of the two bodies. This means that there is a considerable improvement in the security of connection of these bodies. The present construction is suitable for use in fixing various components, e.g. ducts or plug components, in walls of housings. Thus the studlike protrusion can be made to meet one side of a wall of a housing, when the two bodies are screwed together, the body with an external screw thread passing through a bore in that wall, and the head provided on that body abutting against the other side of that wall. For the sake of secure fixing, it is recommended that the wall of the housing and the body with the external screw thread should abut against one another in a rotation-resistant manner. It is a particular advantage of the present construction that the connection of the two screw threaded bodies is considerably improved, yet they can be released with only a slight extra exertion of torsional force. In the accompanying diagrammatic drawing, the single Figure shows, in a partially cut away side view, one embodiment of the invention. In the Figure, 1 denotes a tubular body with a bore, which has an internal screw thread 2. Near the tube end 3, the body 1 is provided with a slot 4 which represents a cut-away portion in the internal screw thread 2. Furthermore, a stud-like protrusion 5 is provided on the end face of the tube end 3, in a sector in the region of the slot 4. A body 6 forms the other part of the screw connection assembly, and has an external screw thread 7 and a head 8. When the body 6 and the body 1 have been screwed into one another, e.g. after the body 6 has been passed through an aperture in a wall (shown at 9 in broken lines), the stud-like protrusion 5 comes up against the head 8, or against the side of the wall 9 facing it. The protrusion 5 then exerts a force in the longitudinal direction of body 1. This force causes the internal screw thread 2 to be deformed, between the studlike protrusion 5 and the slot 4, and consequently causes it to engage the external screw thread 7 more securely than would be possible without the stud-like protrusion 5 and the slot 4. CLAIMS
1. A screw connection assembly comprising a tubular body with a bore having an internal screw thread and a body with an external screw thread fitting the internal screw thread, wherein: the tubular body is provided, beside one end of the tube, around a portion of its periphery, with a slot which also represents a cut-away portion in the internal screw thread, the dimensions of the slot being such that the tubular portion between the slot and the said tube end is elastically deformable; a stud-like protrusion is present on the end face of the said tube end in a sector in the region of the slot; and the body with the external screw thread has a head which extends transversely with respect to the screw thread axis and which the stud-like protrusion directly or indirectly opposes when the two bodies are screwed together.
2. An assembly according to claim 1, wherein, when the two bodies are screwed together, the stud-like protrusion meets one side of a wall of a housing through a bore in which passes the body with an external screw thread, the head provided on that body abutting against the other side of that wall.
3. An assembly according to claim 2, wherein the said wall and the body with an external screw thread abut against one another in a rotationresistant manner.
4. An assembly according to claim 1, substantially as described with reference to the accompanying drawing.
5. An assemblage of components comprising a tubular body and external screw threaded body of an assembly as claimed in claim 1, 2, 3 or 4 in a dismantled condition.
GB08405489A 1983-03-05 1984-03-02 Self locking screw connection Withdrawn GB2136080A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19838306331 DE8306331U1 (en) 1983-03-05 1983-03-05 Screw connection

Publications (2)

Publication Number Publication Date
GB8405489D0 GB8405489D0 (en) 1984-04-04
GB2136080A true GB2136080A (en) 1984-09-12

Family

ID=6750716

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08405489A Withdrawn GB2136080A (en) 1983-03-05 1984-03-02 Self locking screw connection

Country Status (5)

Country Link
CH (1) CH662160A5 (en)
DE (1) DE8306331U1 (en)
DK (1) DK42984A (en)
FR (1) FR2542050B3 (en)
GB (1) GB2136080A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB213188A (en) * 1923-08-30 1924-03-27 William Youlten An improved lock nut
GB280273A (en) * 1926-08-10 1927-11-10 Arthur John Wigglesworth An improved self-locking nut for bolts, threaded screws, and the like
GB505291A (en) * 1937-09-28 1939-05-09 Frithjof Lehre Selflocking nut
GB533013A (en) * 1939-07-03 1941-02-05 Renchtite Spring Nut Company Improvements in or relating to methods of making lock nuts
GB534196A (en) * 1940-01-17 1941-02-28 Frithjof Lehre Improvements in self-locking nuts
GB546046A (en) * 1941-07-16 1942-06-24 Joseph Atkinson Self locking socket and similar type set screws
GB1009476A (en) * 1961-05-26 1965-11-10 Hanfland Curt Hermann Self-locking nut
GB1127593A (en) * 1965-05-13 1968-09-18 Atomic Energy Authority Uk Improvements in screw locking devices
GB1163827A (en) * 1966-09-08 1969-09-10 American Optical Corp Micrometer Adjustment Lock
GB2119886A (en) * 1982-05-05 1983-11-23 Alan Elgar Herbert Ellis Self-locking nuts

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB213188A (en) * 1923-08-30 1924-03-27 William Youlten An improved lock nut
GB280273A (en) * 1926-08-10 1927-11-10 Arthur John Wigglesworth An improved self-locking nut for bolts, threaded screws, and the like
GB505291A (en) * 1937-09-28 1939-05-09 Frithjof Lehre Selflocking nut
GB533013A (en) * 1939-07-03 1941-02-05 Renchtite Spring Nut Company Improvements in or relating to methods of making lock nuts
GB534196A (en) * 1940-01-17 1941-02-28 Frithjof Lehre Improvements in self-locking nuts
GB546046A (en) * 1941-07-16 1942-06-24 Joseph Atkinson Self locking socket and similar type set screws
GB1009476A (en) * 1961-05-26 1965-11-10 Hanfland Curt Hermann Self-locking nut
GB1127593A (en) * 1965-05-13 1968-09-18 Atomic Energy Authority Uk Improvements in screw locking devices
GB1163827A (en) * 1966-09-08 1969-09-10 American Optical Corp Micrometer Adjustment Lock
GB2119886A (en) * 1982-05-05 1983-11-23 Alan Elgar Herbert Ellis Self-locking nuts

Also Published As

Publication number Publication date
CH662160A5 (en) 1987-09-15
FR2542050A1 (en) 1984-09-07
DK42984D0 (en) 1984-01-31
DE8306331U1 (en) 1983-09-15
GB8405489D0 (en) 1984-04-04
DK42984A (en) 1984-09-06
FR2542050B3 (en) 1985-07-26

Similar Documents

Publication Publication Date Title
JP2880318B2 (en) Lateral joint of formed rod
US4224464A (en) Liquid tight connector
US5912431A (en) Snap-in locknut adapter for connectors
US4657429A (en) Securing means
JPS6052353B2 (en) Methods and fittings for protecting the ends of tubular conduits
KR970002010A (en) Metal connection aligner
RU2277624C2 (en) Bush to secure covering member to hollow profile provided with projected part
US4460204A (en) Door handle assembly having a mechanism for preventing inadvertent loosening of the handle
JP2698974B2 (en) Adjustment device for reflector tilt angle in automotive headlamp
CA1298364C (en) Conduit body assembly cover
GB2136080A (en) Self locking screw connection
KR910002265B1 (en) Closure for cable connector
US3321219A (en) Flexible conduit connector
SE8106626L (en) DEVICE FOR SCREW-NUT COMBINATIONS AND ASSEMBLY TOOLS
DE3324675A1 (en) Screw connection for square and rectangular pipes
GB2208335A (en) Cable gland
KR850001096Y1 (en) Attachment of pipe joint
CA2276810A1 (en) Connecting member for an optical fibre cable and method connecting an optical fibre cable
JPS6217622Y2 (en)
US4422213A (en) Door closer shaft
SU1225935A1 (en) Fixed joint fastener
JPH07269539A (en) Fastening member
KR810000494Y1 (en) Band clamp for t.v deflect york
JPH11182755A (en) Pipe joint
SU944818A1 (en) Cutting tool

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)