EP2454495A1 - Nut for a moment screw - Google Patents
Nut for a moment screwInfo
- Publication number
- EP2454495A1 EP2454495A1 EP10799482A EP10799482A EP2454495A1 EP 2454495 A1 EP2454495 A1 EP 2454495A1 EP 10799482 A EP10799482 A EP 10799482A EP 10799482 A EP10799482 A EP 10799482A EP 2454495 A1 EP2454495 A1 EP 2454495A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nut
- torsion member
- clamping member
- thread
- torsion
- 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- Withdrawn
Links
- 230000003313 weakening effect Effects 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 5
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002699 waste 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
- 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
-
- 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
-
- 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
- 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
- F16B39/284—Locking by means of elastic deformation
- F16B39/286—Locking by means of elastic deformation caused by saw cuts
Definitions
- the invention relates to a nut for a moment screw, comprising an upper torsion member, a lower clamping member of the same material with the tor- sion member, and a weakening groove between the torsion member and the clamping member, the weakening part being dimensioned so as to establish a fraction point between the torsion member and the clamping member as a given torque occurs between the torsion member and the clamping member.
- This type of nut for a moment screw is known from the Applicant's patent publication FI-102120.
- This prior known and other similar moment screw nuts involve drawbacks as follows. The nut breaks up sharply without advance warning when subjected to a maximum torque.
- An object of the invention is to provide an improved nut for a moment screw, whereby these drawbacks can be alleviated or even eliminated.
- Fig. 1 shows a nut according to a first embodiment of the invention in an axial section and in a plan view
- Fig. 2 shows a nut according to a second embodiment of the invention in an axial section and in a plan view
- Fig. 3 shows a nut according to a third embodiment in an axial section and in a plan view.
- the proposed moment screw nut comprises an upper torsion member 1 and a lower clamping member 2 of the same material with the torsion member 1. Between the torsion member 1 and the clamping member 2 is a weakening groove 3, which is dimensioned to establish a fraction point between the torsion member and the clamping member as a given torque occurs between the torsion member and the clamping member.
- the lower clamping member 2 has its thread 4 continue, according to the invention, across the fraction point 3 of a nut 6 to a bottom edge or bottom part of the torsion member 1.
- a portion of the thread 4 lying above the fraction point 3 is preferably sufficiently long to resist continued twisting of the torsion member 1 after the nut 6 has fractured, yet with a substantially less- er force (counter torque) than prior to fracturing of the nut 6.
- This portion of the thread 4 present above the fracture point 3 is preferably long enough to retain the torsion member 1 in its place in engagement with the moment screw's thread even after the fracture of the nut 6.
- the embodiments of figs. 1, 2 and 3 only differ from each other in terms of where a deepest point 3a of the weakening groove 3 is located. In fig. 1 the deepest point 3a lies at a bottom edge of the weakening groove, in fig.
- the deepest point 3a is located in the middle of the groove 3, and in fig. 3 the deepest point 3a lies at a top edge of the groove 3.
- the invention achieves an additional benefit of being able to make the nut 6 shorter in its entirety as the thread 4 becomes longer.
- the clamping member 2 has its thread 4 continuing at least one full circle to a position above the deepest point 3a of the weakening groove 3. Modern manufacturing tolerances are so precise that a fracture of the nut is always enabled at the same point, i.e. at the deepest point 3a of the weakening groove 3.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20095798A FI20095798A (en) | 2009-07-17 | 2009-07-17 | Nut for torque screw |
PCT/FI2010/050597 WO2011007052A1 (en) | 2009-07-17 | 2010-07-15 | Nut for a moment screw |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2454495A1 true EP2454495A1 (en) | 2012-05-23 |
EP2454495A4 EP2454495A4 (en) | 2012-12-19 |
Family
ID=40935877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10799482A Withdrawn EP2454495A4 (en) | 2009-07-17 | 2010-07-15 | Nut for a moment screw |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2454495A4 (en) |
FI (1) | FI20095798A (en) |
RU (1) | RU2012105535A (en) |
WO (1) | WO2011007052A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2607723A1 (en) * | 2011-12-19 | 2013-06-26 | Ensto Finland Oy | Torque nut |
EP3346146A1 (en) * | 2017-01-05 | 2018-07-11 | HILTI Aktiengesellschaft | Break nut with fractured surface with a large opening angle |
EP3346147A1 (en) * | 2017-01-05 | 2018-07-11 | HILTI Aktiengesellschaft | Device for limiting torque with fixing claws |
EP3346145A1 (en) | 2017-01-05 | 2018-07-11 | HILTI Aktiengesellschaft | Device for limiting torque with three webs |
CN107883084A (en) * | 2017-11-28 | 2018-04-06 | 广东美的制冷设备有限公司 | Anti-dismantling pipe connection device and air conditioner |
CN107883083A (en) * | 2017-11-28 | 2018-04-06 | 广东美的制冷设备有限公司 | Anti-dismantling pipe connection device and air conditioner |
CN107883085A (en) * | 2017-11-28 | 2018-04-06 | 广东美的制冷设备有限公司 | Anti-dismantling pipe connection device and air conditioner |
US11098744B2 (en) * | 2018-11-30 | 2021-08-24 | Classic Connectors, Inc. | Torque limiting fastener |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2380994A (en) * | 1943-12-11 | 1945-08-07 | Edwin W Pummill | Self-locking nut or bolt |
GB672396A (en) * | 1950-03-22 | 1952-05-21 | Grip Nut Co | Lock nut and method of making the same |
US3512447A (en) * | 1968-09-09 | 1970-05-19 | Rudolph Marion Vaughn | Frangible nut fastener |
US3727254A (en) * | 1971-05-05 | 1973-04-17 | Precision Screw & Mfg | Method of forming an insert bush |
DE19859208A1 (en) * | 1997-12-26 | 1999-07-01 | Nagayama Denshi Kogyo Kk | Metal fastener and method of manufacture |
US20010018014A1 (en) * | 2000-02-16 | 2001-08-30 | Katsuo Ito | Self-locking nut |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6292315U (en) * | 1985-11-29 | 1987-06-12 | ||
DE10119913A1 (en) * | 2001-04-23 | 2002-10-31 | Emhart Llc Newark | Screw nut for limiting an acting torque and the corresponding procedure |
-
2009
- 2009-07-17 FI FI20095798A patent/FI20095798A/en not_active Application Discontinuation
-
2010
- 2010-07-15 WO PCT/FI2010/050597 patent/WO2011007052A1/en active Application Filing
- 2010-07-15 EP EP10799482A patent/EP2454495A4/en not_active Withdrawn
- 2010-07-15 RU RU2012105535/12A patent/RU2012105535A/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2380994A (en) * | 1943-12-11 | 1945-08-07 | Edwin W Pummill | Self-locking nut or bolt |
GB672396A (en) * | 1950-03-22 | 1952-05-21 | Grip Nut Co | Lock nut and method of making the same |
US3512447A (en) * | 1968-09-09 | 1970-05-19 | Rudolph Marion Vaughn | Frangible nut fastener |
US3727254A (en) * | 1971-05-05 | 1973-04-17 | Precision Screw & Mfg | Method of forming an insert bush |
DE19859208A1 (en) * | 1997-12-26 | 1999-07-01 | Nagayama Denshi Kogyo Kk | Metal fastener and method of manufacture |
US20010018014A1 (en) * | 2000-02-16 | 2001-08-30 | Katsuo Ito | Self-locking nut |
Non-Patent Citations (1)
Title |
---|
See also references of WO2011007052A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2454495A4 (en) | 2012-12-19 |
FI20095798A0 (en) | 2009-07-17 |
WO2011007052A1 (en) | 2011-01-20 |
RU2012105535A (en) | 2013-08-27 |
FI20095798A (en) | 2011-01-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20120217 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
|
DAX | Request for extension of the european patent (deleted) | ||
A4 | Supplementary search report drawn up and despatched |
Effective date: 20121121 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: F16B 33/00 20060101ALI20121115BHEP Ipc: F16B 39/286 20060101ALI20121115BHEP Ipc: F16B 31/02 20060101AFI20121115BHEP |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20130621 |