DK154721B - TORQUE LIMITER MOTRIC - Google Patents
TORQUE LIMITER MOTRIC Download PDFInfo
- Publication number
- DK154721B DK154721B DK282879AA DK282879A DK154721B DK 154721 B DK154721 B DK 154721B DK 282879A A DK282879A A DK 282879AA DK 282879 A DK282879 A DK 282879A DK 154721 B DK154721 B DK 154721B
- Authority
- DK
- Denmark
- Prior art keywords
- nut
- parts
- annular area
- jacket
- cut
- Prior art date
Links
- 239000002184 metal Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000002654 heat shrinkable material Substances 0.000 description 1
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
- F16B33/00—Features common to bolt and nut
-
- 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
- F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Insulating Bodies (AREA)
- Bolts, Nuts, And Washers (AREA)
- Clamps And Clips (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Description
iin
DK 154721 BDK 154721 B
Den foreliggende opfindelse angår en tilspændings-momentbegrænsermøtrik af metal, i hvilken en første del, som har et indvendigt gevind, ved hjælp af et ringformet område, der har et ringe tværsnit i forhold til nyttetvær-5 snittet af møtrikken, er forbundet med en anden koaksial del, som har et indre hulrum, der ikke er forsynet med gevind, og overflader, som er bestemt til at samvirke med et tilspændingsværktøj.The present invention relates to a tightening torque limiter nut of metal, in which a first part, which has an internal thread, is connected by means of an annular area having a small cross-section relative to the useful cross-section of the nut to a second coaxial part having an inner cavity not threaded and surfaces intended to cooperate with a tightening tool.
En sådan møtrik har visse ulemper, når man ønsker at lo anvende den til elektriske apparater, f.eks. til at foretage en veldefineret tilspænding bestemt til at fremkalde elektrisk kontakt med god kvalitet på samleskinner.Such a nut has certain disadvantages when one wants to use it for electrical appliances, e.g. to make a well-defined tightening intended to induce good quality electrical contact on busbars.
Når man anvender sådanne skruer, kan den ikke gevind-skårne del, som brækkes af ved overklipning af et i for-15 vejen svækket område, slippe bort fra tilspændingsværktø-jet, falde ned på utilgængelige steder, hvor der findes spændingsførende organer, og forårsage kortslutninger på idriftsætningstidspunktet.When using such screws, the non-threaded part, which breaks off by cutting a pre-weakened area, can slip away from the tightening tool, fall into inaccessible places where live means are present, and cause short circuits at the time of commissioning.
Denne mulighed er endnu mere at befrygte, hvis dis-2o se møtrikker anvendes på en arbejdsplads af mandskab, som ikke er specialiseret i at kunne undgå farerne ved en sådan situation. Det forhold at elektriske skabe leveres i adskilte dele for at tilfredsstille visse særlige krav, gør det iøvrigt nødvendigt at iværksætte foranstaltninger 25 eller benytte simple bestanddele, som sætter montørerne i stand til at garantere for kvaliteten af deres arbejde og fortrinsvis uden at kræve specialværktøj, såsom momentnøgler. Det er endelig almindeligvis ønskeligt at kunne kontrollere, om forsøg på løsskruning eller efterspænding er 3o blevet gjort senere på disse møtrikker.This possibility is even more to be feared if dis-2o see nuts are used in a workplace by crew who do not specialize in being able to avoid the dangers of such a situation. The fact that electrical cabinets are supplied in separate parts to satisfy certain special requirements makes it necessary to take measures 25 or use simple components which enable the fitters to guarantee the quality of their work and preferably without requiring special tools, such as torque wrenches. Finally, it is generally desirable to be able to check whether unscrewing or retightening attempts have been made 3o later on these nuts.
Formålet med den foreliggende opfindelse er at tilvejebringe en tilspændingsmøtrik med momentbegrænsning, som ikke frembyder de ovenfor nævnte mangler, eller hvor de er reduceret væsentligt, og at tilvejebringe på simpel måde 35 et tilspændingsmiddel, som ikke til sin anvendelse kræver særlig opmærksomhed af brugeren, samtidig med at fordelene ved den kendte teknik udnyttes.The object of the present invention is to provide a tightening nut with torque limitation which does not present the above-mentioned deficiencies or where they are significantly reduced, and to provide in a simple manner a tightening means which for its use does not require special attention of the user, at the same time with the benefits of the prior art being exploited.
DK 154721BDK 154721B
22
Ifølge opfindelsen opnås dette ved, at en isoleren-‘ de kontinuerlig kappe strækker sig på ydersiden fra den første del til den anden del, og at denne isolerende kappe dels hænger fast ved de to dele, således at de bibehol-5 des tæt ved hinanden efter deres adskillelse, og dels har en tilstrækkelig ringe tykkelse til at kunne afskæres eller overklippes i plan med det nævnte ringformede område.According to the invention, this is achieved in that an insulating continuous sheath extends on the outside from the first part to the second part, and that this insulating sheath is partly attached to the two parts, so that they are maintained close to each other. after their separation, and on the one hand have a sufficiently small thickness to be able to be cut or cut flush with the said annular area.
Opfindelsen skal herefter forklares nærmere under henvisning til tegningen, hvor lo fig. 1 viser en første udførelsesform for møtrikken ifølge opfindelsen og fig. 2 en anden udføreisesform for møtrikken ifølge opfindelsen.The invention will now be explained in more detail with reference to the drawing, in which fig. 1 shows a first embodiment of the nut according to the invention and fig. 2 shows another embodiment of the nut according to the invention.
15 I fig. 1 er vist en metalmøtrik 5, der består af en første del 1 med en med gevind forsynet boring 4, en anden del 2, som er koncentrisk med den første og har et in-2o dre hulrum 6, der ikke er forsynet med gevind, og hvis diameter er større end diametren af den ikke viste skrue, som skal optages af den gevindskårne del, og et område 3, der forbinder de to dele. På grund af tilstedeværelsen af en udvendig rille 8 er det ringformede tværsnit af området 3 25 lille i sammenligning med nyttetværsnittet af den første del. Når et forudbestemt tilspændingsmoment bliver udøvet på den anden del, vil området 3 blive overklippet af torsionskræfterne .In FIG. 1 shows a metal nut 5 consisting of a first part 1 with a threaded bore 4, a second part 2 which is concentric with the first and has an inner cavity 6 which is not threaded, and whose diameter is greater than the diameter of the screw (not shown) to be received by the threaded part and an area 3 connecting the two parts. Due to the presence of an outer groove 8, the annular cross-section of the area 3 is small in comparison with the useful cross-section of the first part. When a predetermined tightening torque is exerted on the second part, the area 3 will be cut by the torsional forces.
Den udvendige overflade af møtrikken er beklædt med 3o en kappe 31 af isolerende plastmateriale med ringe tykkelse, hvilken kappe strækker sig fra den første del til den anden del, idet den følger omridset af rillen 8. Denne kappe, der kan være støbt på eller være anbragt ved anvendelse af et varmekrympeligt materiale, hænger fast ved de 35 to dele i kraft af en hvilken som helst passende foranstaltning. I det viste eksempel er den nederste overflade af kappen en ringformet endeflade dannet ved en reduktion 3The outer surface of the nut is lined with a jacket 31 of insulating plastic material of small thickness, which jacket extends from the first part to the second part, following the outline of the groove 8. This jacket, which may be molded on or be placed using a heat-shrinkable material, adheres to the two parts by any suitable measure. In the example shown, the lower surface of the sheath is an annular end surface formed by a reduction 3
DK 154721 BDK 154721 B
af den ydre diameter 2o, som støder op til anlægsfladen -23 af møtrikken, medens den øverste overflade 7 af kappen ved lo strækker sig ind til overfladen 29 modsat anlægsfladen 23. Flader, såsom 21, der f.eks. danner et prisme 5 med sekskantet grundflade, kan være anbragt på den anden del for at gøre det muligt at udføre tilspændingen ved hjælp af en skruenøgle.of the outer diameter 20, which abuts the abutment surface -23 of the nut, while the upper surface 7 of the jacket at lo extends into the surface 29 opposite the abutment surface 23. Surfaces, such as 21, which e.g. forming a prism 5 with a hexagonal base, may be located on the second part to enable the tightening to be performed by means of a wrench.
Kappen 31, som passer til den udvendige form af denne del og dermed, de nævnte flader, muliggør således forlo bindelse mellem en nøgle og disse flader under hensyntagen til en vis sammentrykning af kappens materiale. En ringformet kant 33 kan iøvrigt tjene som støtte for nøglen i aksial retning.The sheath 31, which fits the outer shape of this part and thus, the said surfaces, thus enables the connection between a key and these surfaces, taking into account a certain compression of the material of the sheath. An annular edge 33 can otherwise serve as a support for the key in the axial direction.
Når den anden del adskilles fra den første, kan der 15 optræde to situationer: i det første tilfælde har operatøren ikke kunnet kontrollere bevægelsen af nøglen i brudøjeblikket,og den kraft, som han endnu udøver på dette tidspunkt, fremkalder desuden overklipning eller sønderrivning af kappen 31 i plan 2o med rillen 8. Hvis den anden del så slipper fri med nøglen og lægger sig på et utilgængeligt sted, er dens tilstedeværelse i praksis blevet uskadelig som følge af de isolerende egenskaber af kappen, som omgiver den.When the second part is separated from the first, two situations can occur: in the first case, the operator has not been able to control the movement of the key at the moment of breaking, and the force he is still exerting at this time also causes the sheath to be cut or torn. 31 in plane 2o with the groove 8. If the second part then escapes with the key and lies down in an inaccessible place, its presence has in practice become harmless due to the insulating properties of the sheath which surrounds it.
I det andet tilfælde har operatøren kunnet kontrollere sin 25 bevægelse, og hvis der ikke er nogen bestemt grund, som berettiger fjernelsen af den anden del, såsom f.eks. pladsbehov, forbliver den bibeholdt der af den øverste del 7 af kappen og kan følgelig ikke forsvinde i et utilgængeligt område af anlægget.In the second case, the operator has been able to control its movement, and if there is no particular reason which justifies the removal of the second part, such as e.g. space requirements, it remains there by the upper part 7 of the casing and consequently cannot disappear in an inaccessible area of the plant.
3o Da det er ønskeligt at kontrollere, om skruen er blevet påvirket efter en første tilspænding, vil en undersøgelse af den nederste overflade 9 af kappen gøre det muligt at konstatere, om et værktøj har udøvet et moment på denne for at medtage den ydre overflade 27 af den første del.3o Since it is desirable to check whether the screw has been actuated after a first tightening, an examination of the lower surface 9 of the sheath will make it possible to ascertain whether a tool has exerted a moment on it to include the outer surface 27. of the first part.
25 I den anden i fig. 2 viste udførelsesform har en møtrik 15 en første del 11 og en anden del 12, der er adskilt af et område 13 med reduceret tværsnit. Også her er der enIn the second in fig. 2, a nut 15 has a first part 11 and a second part 12 separated by an area 13 of reduced cross-section. Here, too, there is one
DK 154721 BDK 154721 B
4 med gevind forsynet åbning 14 i den første del, medens ‘der i det indre af den anden del er et hulrum 16.4 with threaded opening 14 in the first part, while ‘in the interior of the second part there is a cavity 16.
Den udvendige overflade af denne anden del har her ydre flader 22 og en ringformet rille 25 i nærheden af 5 rillen 18, der er analog med den foregående rille 8. Den isolerende kappe 32, der strækker sig fra rillen 25 til den nederste endeflade 26, udfylder fuldstændigt rillen 18.The outer surface of this second part here has outer surfaces 22 and an annular groove 25 in the vicinity of the groove 18, which is analogous to the preceding groove 8. The insulating jacket 32 extending from the groove 25 to the lower end surface 26, completely fills the groove 18.
Selv om en uforsætlig kraft skulle blive udøvet på kappen, udsættes denne følgelig i mindre grad for at blive lo revet over, og den anden del vil forblive på plads. Et senere indgreb vil i alle tilfælde gøre det muligt at overklippe eller afskære kappen i plan med området 18, hvis særlige grunde berettiger det.Consequently, even if an unintentional force should be exerted on the mantle, it is less exposed to being torn over and the other part will remain in place. A later intervention will in all cases make it possible to cut or cut the mantle in line with the area 18, if special reasons justify it.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7820684A FR2431063A1 (en) | 1978-07-11 | 1978-07-11 | TORQUE LIMITER NUT |
FR7820684 | 1978-07-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
DK282879A DK282879A (en) | 1980-01-12 |
DK154721B true DK154721B (en) | 1988-12-12 |
DK154721C DK154721C (en) | 1989-05-16 |
Family
ID=9210606
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK282879A DK154721C (en) | 1978-07-11 | 1979-07-04 | TORQUE LIMITER MOTRIC |
Country Status (14)
Country | Link |
---|---|
AT (1) | AT362963B (en) |
BE (1) | BE877456A (en) |
BR (1) | BR7904376A (en) |
CA (1) | CA1120291A (en) |
DE (1) | DE2926826C2 (en) |
DK (1) | DK154721C (en) |
FI (1) | FI65847C (en) |
FR (1) | FR2431063A1 (en) |
GB (1) | GB2029539B (en) |
IE (1) | IE48743B1 (en) |
MA (1) | MA18515A1 (en) |
NL (1) | NL184291C (en) |
NO (1) | NO148605C (en) |
SE (1) | SE429257B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2503807A1 (en) * | 1981-04-13 | 1982-10-15 | Verlant Et Beaurain | Insulated tightening bolt for screw-fastening cable connectors - has shaft head with inserted hexagonal insulating plug preventing electrical contact with cable, and tightenable with allen key |
GB2133491A (en) * | 1983-01-07 | 1984-07-25 | Roy Rogers | Security nuts |
EP0287381A3 (en) * | 1987-04-16 | 1990-06-13 | Supedo Pty. Limited | Fastening device |
GB0021277D0 (en) * | 2000-08-31 | 2000-10-18 | B & H Nottingham Ltd | Shearable fastener |
DE10248229B3 (en) * | 2002-10-16 | 2004-05-19 | Sfs Intec Holding Ag | Nut with breakable tool attack |
DE102008039431B4 (en) * | 2008-08-25 | 2013-08-29 | Cellpack Gmbh | Tear-off screw for connecting elements of electrical conductors |
FR3063530B1 (en) * | 2017-03-03 | 2021-06-11 | Seifel | SELF-BREAKING SCREW |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR358505A (en) * | 1905-10-13 | 1906-02-20 | Nicolas Teste | Adjustable friction-limited screw device |
GB640478A (en) * | 1947-12-17 | 1950-07-19 | Benjamin George Forman | Improvements in and relating to non-conductive fastening devices |
GB854792A (en) * | 1958-07-29 | 1960-11-23 | A P Newall & Company Ltd | Improvements relating to screw nuts |
FR1431608A (en) * | 1964-04-28 | 1966-03-11 | Standard Pressed Steel Co | preloaded nut |
GB1144080A (en) * | 1968-01-19 | 1969-03-05 | Gkn Screws Fasteners Ltd | Improvements in or relating to nuts |
US3449998A (en) * | 1968-01-31 | 1969-06-17 | Hi Shear Corp | Inherently torque-limited fastener |
US3482864A (en) * | 1968-03-26 | 1969-12-09 | Hi Shear Corp | Fluid sealed joint |
US3512447A (en) * | 1968-09-09 | 1970-05-19 | Rudolph Marion Vaughn | Frangible nut fastener |
GB1321103A (en) * | 1970-05-01 | 1973-06-20 | Rapid Metal Developments Ltd | Tie rod end pieces |
AT322296B (en) * | 1970-05-06 | 1975-05-12 | Inteco Establishment | PROCESS FOR PROTECTING SCREW THREADS AGAINST CORROSION AND SCREW THREADS TREATED BY THE PROCESS |
US3728933A (en) * | 1971-03-11 | 1973-04-24 | Mac Lean Fogg Lock Nut Co | Means and method for controlling tension in a threaded member |
-
1978
- 1978-07-11 FR FR7820684A patent/FR2431063A1/en active Granted
-
1979
- 1979-07-03 SE SE7905793A patent/SE429257B/en not_active IP Right Cessation
- 1979-07-03 BE BE0/196111A patent/BE877456A/en not_active IP Right Cessation
- 1979-07-03 DE DE2926826A patent/DE2926826C2/en not_active Expired
- 1979-07-04 DK DK282879A patent/DK154721C/en not_active IP Right Cessation
- 1979-07-04 NL NLAANVRAGE7905215,A patent/NL184291C/en not_active IP Right Cessation
- 1979-07-06 AT AT0472879A patent/AT362963B/en not_active IP Right Cessation
- 1979-07-09 NO NO792284A patent/NO148605C/en unknown
- 1979-07-10 MA MA18712A patent/MA18515A1/en unknown
- 1979-07-10 BR BR7904376A patent/BR7904376A/en not_active IP Right Cessation
- 1979-07-10 CA CA000331454A patent/CA1120291A/en not_active Expired
- 1979-07-11 GB GB7924147A patent/GB2029539B/en not_active Expired
- 1979-07-11 FI FI792172A patent/FI65847C/en not_active IP Right Cessation
- 1979-08-08 IE IE1306/79A patent/IE48743B1/en unknown
Also Published As
Publication number | Publication date |
---|---|
FI65847C (en) | 1984-07-10 |
SE7905793L (en) | 1980-01-12 |
FR2431063B1 (en) | 1980-12-19 |
DK154721C (en) | 1989-05-16 |
BE877456A (en) | 1979-11-05 |
SE429257B (en) | 1983-08-22 |
IE48743B1 (en) | 1985-05-01 |
DK282879A (en) | 1980-01-12 |
BR7904376A (en) | 1980-04-08 |
NO148605B (en) | 1983-08-01 |
MA18515A1 (en) | 1980-04-01 |
ATA472879A (en) | 1980-11-15 |
NL184291C (en) | 1989-06-01 |
FI792172A (en) | 1980-01-12 |
GB2029539A (en) | 1980-03-19 |
CA1120291A (en) | 1982-03-23 |
DE2926826C2 (en) | 1986-12-18 |
NL184291B (en) | 1989-01-02 |
IE791306L (en) | 1980-01-11 |
FI65847B (en) | 1984-03-30 |
DE2926826A1 (en) | 1980-01-24 |
NO148605C (en) | 1983-11-16 |
GB2029539B (en) | 1983-05-05 |
AT362963B (en) | 1981-06-25 |
FR2431063A1 (en) | 1980-02-08 |
NL7905215A (en) | 1980-01-15 |
NO792284L (en) | 1980-01-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PBP | Patent lapsed |