IT201900005832A1 - BOLT OR SCREW WITH DOUBLE RESISTANCE AND WITH DECURTED PITCH - Google Patents
BOLT OR SCREW WITH DOUBLE RESISTANCE AND WITH DECURTED PITCH Download PDFInfo
- Publication number
- IT201900005832A1 IT201900005832A1 IT102019000005832A IT201900005832A IT201900005832A1 IT 201900005832 A1 IT201900005832 A1 IT 201900005832A1 IT 102019000005832 A IT102019000005832 A IT 102019000005832A IT 201900005832 A IT201900005832 A IT 201900005832A IT 201900005832 A1 IT201900005832 A1 IT 201900005832A1
- Authority
- IT
- Italy
- Prior art keywords
- bolt
- pitch
- screw
- thread
- threads
- Prior art date
Links
- 239000011295 pitch Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 2
- 241000589902 Leptospira Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 210000001520 comb Anatomy 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003466 welding Methods 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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/06—Specially-shaped heads
-
- 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
- F16B31/06—Screwed connections specially modified in view of tensile load; Break-bolts having regard to possibility of fatigue rupture
-
- 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
- F16B33/02—Shape of thread; Special thread-forms
-
- 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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
- F16B35/044—Specially-shaped ends
- F16B35/047—Specially-shaped ends for preventing cross-threading, i.e. preventing skewing of 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
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
- F16B5/0241—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread with the possibility for the connection to absorb deformation, e.g. thermal or vibrational
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Joining Of Building Structures In Genera (AREA)
- Forging (AREA)
Description
DESCRIZIONE DEL BREVETTO PER INVENZIONE DAL TITOLO: DESCRIPTION OF THE PATENT FOR INVENTION BY TITLE:
“BULLONE O VITE A DOPPIA RESISTENZA E DI PASSO DECURTATO” "BOLT OR SCREW WITH DOUBLE RESISTANCE AND WITH A DECURTED PITCH"
Campo della tecnica: nella bulloneria. Field of technology: in nuts and bolts.
I problemi tecnici incontrati sono i seguenti: The technical problems encountered are the following:
In un bullone tradizionale nel suo serraggio il carico si concentra per il 50% sul primo filetto in presa e per il 20% sul secondo filetto in presa; nel presente invece il carico si ripartisce in modo uguale su ogni filetto in presa. When tightening a traditional bolt, the load is concentrated 50% on the first thread in engagement and 20% on the second thread in engagement; in the present, on the other hand, the load is distributed equally on each thread in contact.
Soluzione al problema: si pratica nel bullone forato un filetto di passo decurtato del cedimento sul primo filetto in presa. Solution to the problem: a thread is made in the drilled bolt with a pitch reduced by the yield on the first thread in contact.
Veniamo ora ad illustrare che cosa è noto: We now come to illustrate what is known:
È noto che in un normale bullone filettato “ma”, il carico è del 50% sul primo filetto in presa e del 20% sul secondo filetto in presa. It is known that in a normal “ma” threaded bolt, the load is 50% on the first thread in engagement and 20% on the second thread in engagement.
E' noto che la testa del bullone può essere eseguita o per deformazione plastica da tubo rullato nelle macchine Waterbury o National, o rullatrici, oppure per saldatura al gambo mediante frizione; nel quale ultimo caso la parte filettata del tubo può essere eseguita su di una lunghezza illimitata del tubo. It is known that the head of the bolt can be made either by plastic deformation from a rolled tube in Waterbury or National machines, or by rolling machines, or by welding to the stem by means of friction; in which last case the threaded part of the tube can be performed on an unlimited length of the tube.
È noto che, la sollecitazione è minore nel bullone semplicemente forato, poiché si ripartisce il carico su di una parte a maggiore allungamento. It is known that the stress is lower in the bolt simply drilled, since the load is distributed on a part with greater elongation.
E' noto che una differenza di passo si accumula con l'aumentare del numero dei filetti. It is known that a difference in pitch accumulates as the number of threads increases.
Da studi precedenti del depositante , il dado allungato presentava una minor concentrazione delle linee di forza all'attacco della testa rispetto al tradizionale. From previous depositor studies, the elongated nut featured a lower concentration of the lines of force at the head attachment than the traditional.
LO SCOPO DEL TROVATO THE PURPOSE OF THE FOUND
è quello di fabbricare un bullone leggero e resistente. is to manufacture a light and strong bolt.
I BREVETTI ESAMINATI SONO I SEGUENTI: PATENTS EXAMINED ARE THE FOLLOWING:
DE202006008313: E' un bullone forato, liscio all'interno, che si allunga più facilmente, distribuendo pertanto maggiormente il carico sui vari filetti; l’anima pertanto non ha perso totalmente il difetto di non rilasciare lo sforzo concentrato sul primo filetto in presa; quindi in detto brevetto non si presenta il nostro passo decurtato. DE202006008313: It is a hollow bolt, smooth inside, which stretches more easily, thus distributing more the load on the various threads; the core therefore has not totally lost the defect of not releasing the concentrated effort on the first thread in the grip; therefore our reduced step is not shown in said patent.
ALLO STATO ATTUALE DELLA TECNICA, molti tentativi erano stati effettuati allo scopo di ripartire meglio il carico fra i vari filetti in presa: il Maduska aveva fatto variare il diametro esterno della madrevite (dado ad imbuto); il lo perfezionò ulteriormente imbutendolo da lamiera. Sempre nel suo libro “parti interne di macchine”, il IN THE CURRENT STATE OF THE ART, many attempts had been made in order to better distribute the load between the various threads in the grip: the Maduska had made the external diameter of the nut screw (funnel nut) vary; the perfected it further by drawing it from sheet metal. Also in his book "internal parts of machines", the
propose il bullone filettato da due pettini assottigliati ad angolo; il Bolt praticava una scanalatura a profondità variabile sul fondo della gola della madrevite; altri la filettatura a diametro variabile o di passo variabile (soluzioni non praticamente interessanti). Altro dato da non sottovalutare, è quello che sulla prima spira in presa la deformazione diviene permanente, quasi doppia del limite di elasticità! proposed the bolt threaded by two combs thinned at an angle; the Bolt made a variable depth groove in the bottom of the nut groove; others the threading with variable diameter or variable pitch (not practically interesting solutions). Another fact that should not be underestimated is that the deformation becomes permanent on the first coil in contact, almost double the elasticity limit!
GLI STUDI DEI DEPOSITANTI SONO I SEGUENTI: THE STUDIES OF THE DEPOSITORS ARE THE FOLLOWING:
Da esperimenti effettuati dal Levi d’Ancona, ancora studente, nei suoi esperimenti di fotoelasticità, risultò che il diagramma delle tensioni poteva essere meno gravoso nel dado tubolare. From experiments carried out by Levi d’Ancona, still a student, in his photoelasticity experiments, it turned out that the stress diagram could be less burdensome in the tubular nut.
Ne consegue che occorre diminuire il carico in corrispondenza dei filetti in presa con altri metodi: negli anni 60 lo scrivente ottenne dei risultati inclinando il pettine filettatore debitamente scaricato. It follows that it is necessary to reduce the load in correspondence with the threads in contact with other methods: in the 1960s the writer obtained results by tilting the duly unloaded threading reed.
Veniamo ora ad effettuare l'ESPOSIZIONE DELL'INVENZIONE We now come to carry out the EXPOSURE OF THE INVENTION
Si allarga a tazza in (6) sul pezzo in serraggio la testa del bullone, mentre la sua filettatura viene decurtata del cedimento sotto sforzo sul primo filetto in presa. Si fanno penetrare sul pezzo 5 o 6 filetti, mentre il resto dello stelo viene scaricato dai filetti. The head of the bolt widens into a cup at (6) on the piece being clamped, while its thread is reduced by the yield under stress on the first thread in engagement. 5 or 6 threads are made to penetrate the piece, while the rest of the stem is unloaded from the threads.
In pratica, sul bullone filettato passo 1 ma si praticano 5 o 6 filetti di passo 0,95 anziché 1; nell'avvitare il bullone, l'ultimo filetto entra in presa, poi i successivi, fino ad eguagliare le tensioni sui vari filetti; lo stesso ragionamento se si volesse praticare un bullone o una vite di passo 1 mm con 4, 6 o 7 filetti in presa: i passi risultano 0,96, 0,94, 0,93. In practice, on the threaded bolt pitch 1 but 5 or 6 threads with a pitch of 0.95 are made instead of 1; when screwing the bolt, the last thread engages, then the following ones, until the tensions on the various threads are equal; the same reasoning if you wanted to make a bolt or a screw with a pitch of 1 mm with 4, 6 or 7 threads in contact: the pitches are 0.96, 0.94, 0.93.
I VANTAGGI TALI DA GIUSTIFICARE L'ATTIVITA' INVENTIVA E L'INNOVAZIONE, SONO I SEGUENTI: THE ADVANTAGES TO JUSTIFY THE INVENTIVE ACTIVITY AND INNOVATION ARE THE FOLLOWING:
a) L’insieme di tanti bulloni o viti con minor concentrazione delle linee di forza, alleggerisce tutta la struttura assiemata; a) The set of many bolts or screws with less concentration of the lines of force, lightens the entire assembled structure;
b) Una migliore ripartizione delle sollecitazioni interne permette di reggere ad un maggior carico di fatica. b) A better distribution of the internal stresses allows to withstand a greater fatigue load.
c) Se il bullone o la vite regge al doppio sforzo, la minor concentrazione delle linee di forza sul pezzo da serrare permette di dimezzare il peso del pezzo serrato. c) If the bolt or screw holds up to double effort, the lower concentration of the lines of force on the workpiece to be clamped allows to halve the weight of the clamped workpiece.
d) La differenziazione di passo non è molto dispendiosa. d) The differentiation of pitch is not very expensive.
e) Una volta raggiunto il carico di serraggio, la conicità di testa cede fino al pareggio sul pezzo (con chiave dinamometrica fino al contatto); la tensione residua renderà il dado autobloccante; e) Once the clamping load has been reached, the head taper yields until it is even on the piece (with a torque wrench until contact); residual tension will make the nut self-locking;
f) Sotto testa del bullone non si presentano più addensamenti di linee di forza, che agli estremi limiti si presenterebbe al distacco; f) Under the head of the bolt there are no more densification of lines of force, which at the extreme limits would occur upon detachment;
g) La diminuzione della densità delle linee di forza nel pezzo da serrare ne rende integro il materiale anche sotto sollecitazione a fatica, e ciò è di basilare importanza per la tenuta dei serbatoi. g) The decrease in the density of the lines of force in the piece to be clamped makes the material intact even under fatigue stress, and this is of fundamental importance for the tightness of the tanks.
h) Nelle caldaie e nei motori a scoppio il calore viene evacuato dall'anima interna del bullone (vuota). h) In internal combustion boilers and engines the heat is evacuated from the inner core of the bolt (empty).
i) Si può utilizzare per il dispositivo, un normale bullone di serie. i) A normal stock bolt can be used for the device.
L'UNITA' DELL'INVENZIONE E' LA SEGUENTE: THE UNIT OF THE INVENTION IS THE FOLLOWING:
Il bullone o la vite sono eseguiti in un solo pezzo. The bolt or screw is made in one piece.
L'INDUSTRIALIZZAZIONE DEL TROVATO E' LA SEGUENTE: THE INDUSTRIALIZATION OF THE FOUND IS THE FOLLOWING:
Il bullone o la vite vengono eseguiti dal pieno o dal tubo, come nel procedimento tradizionale. Si è solo diminuito il suo diametro esterno in corrispondenza della parte fino al primo filetto in presa nella giunzione fra i due pezzi. The bolt or screw is made from solid or from the tube, as in the traditional procedure. It has only decreased its external diameter in correspondence with the part up to the first thread in the junction between the two pieces.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102019000005832A IT201900005832A1 (en) | 2019-04-16 | 2019-04-16 | BOLT OR SCREW WITH DOUBLE RESISTANCE AND WITH DECURTED PITCH |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102019000005832A IT201900005832A1 (en) | 2019-04-16 | 2019-04-16 | BOLT OR SCREW WITH DOUBLE RESISTANCE AND WITH DECURTED PITCH |
Publications (1)
Publication Number | Publication Date |
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IT201900005832A1 true IT201900005832A1 (en) | 2020-10-16 |
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IT102019000005832A IT201900005832A1 (en) | 2019-04-16 | 2019-04-16 | BOLT OR SCREW WITH DOUBLE RESISTANCE AND WITH DECURTED PITCH |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US197467A (en) * | 1877-11-27 | Improvement in nut and bolt locks | ||
US4956888A (en) * | 1985-05-28 | 1990-09-18 | Green William P | Formation of fasteners and connections with variable pitch threads |
DE20100542U1 (en) * | 2001-01-12 | 2001-03-08 | Chien Fang Cheng | Arrangement of screw and washer |
DE202006008313U1 (en) | 2006-05-26 | 2007-09-27 | Abc Umformtechnik Gmbh & Co. Kg | Fastening arrangement for motor vehicle wheels |
BRMU8801198U2 (en) * | 2008-06-18 | 2010-02-23 | Gilvan Franke | differential pitch thread for better clamping load distribution between engaged fillets |
US9352382B2 (en) * | 2009-01-29 | 2016-05-31 | Lisi Aerospace | Screw or nut with a thread a pitch of which varies and tool to produce said screw or nut |
EP3045742A1 (en) * | 2015-01-19 | 2016-07-20 | THALETEC GmbH | Assembly with a screwable fastening element and a sealing element, use of such an assembly and method for testing the tightness of such an assembly |
-
2019
- 2019-04-16 IT IT102019000005832A patent/IT201900005832A1/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US197467A (en) * | 1877-11-27 | Improvement in nut and bolt locks | ||
US4956888A (en) * | 1985-05-28 | 1990-09-18 | Green William P | Formation of fasteners and connections with variable pitch threads |
DE20100542U1 (en) * | 2001-01-12 | 2001-03-08 | Chien Fang Cheng | Arrangement of screw and washer |
DE202006008313U1 (en) | 2006-05-26 | 2007-09-27 | Abc Umformtechnik Gmbh & Co. Kg | Fastening arrangement for motor vehicle wheels |
BRMU8801198U2 (en) * | 2008-06-18 | 2010-02-23 | Gilvan Franke | differential pitch thread for better clamping load distribution between engaged fillets |
US9352382B2 (en) * | 2009-01-29 | 2016-05-31 | Lisi Aerospace | Screw or nut with a thread a pitch of which varies and tool to produce said screw or nut |
EP3045742A1 (en) * | 2015-01-19 | 2016-07-20 | THALETEC GmbH | Assembly with a screwable fastening element and a sealing element, use of such an assembly and method for testing the tightness of such an assembly |
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