GB1351735A - Shock attenuators - Google Patents
Shock attenuatorsInfo
- Publication number
- GB1351735A GB1351735A GB1351735DA GB1351735A GB 1351735 A GB1351735 A GB 1351735A GB 1351735D A GB1351735D A GB 1351735DA GB 1351735 A GB1351735 A GB 1351735A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rod
- tube
- shock
- base
- tubes
- 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.)
- Expired
Links
- 230000035939 shock Effects 0.000 title abstract 7
- 235000007754 Achillea millefolium Nutrition 0.000 abstract 1
- 240000000073 Achillea millefolium Species 0.000 abstract 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract 1
- 239000004677 Nylon Substances 0.000 abstract 1
- 239000002783 friction material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229920001778 nylon Polymers 0.000 abstract 1
- 230000000979 retarding effect Effects 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/125—Units with a telescopic-like action as one member moves into, or out of a second member
Abstract
1351735 Energy-absorbing shock attenuators YARROW & CO Ltd 19 April 1971 [13 April 1970] 17439/70 Heading F2E A shock attenuator comprises a solid rod 1 partially inserted into a tube 2 and in operation when the rod 1 is moved in one direction relative to the tube 2, successive annular portions of the tube 2 along its length are deformed in turn by the rod 1 and the material of each such portion is stretched beyond its elastic limit but not to its ultimate limit, at which buckling or rupture occurs, so that a substantially constant retarding force between the members 1, 2 is attained during the relative movement, one of the members 1, 2 having a surface of low frictional resistance normal to the direction of said relative movement so that the forces transmitted by the attenuator are in the direction of relative movement even if the surface is subjected to an oblique blow. In the embodiment of Fig. 1, the tube 2 is secured to a base 3 and the load of the equipment to be supported acts through the rod 1 which has a hemi-spherical end portion. When the rod 1 is inserted into the tube 2 the force transmitted by the mounting gradually increases until it reaches a constant value and remains substantially constant until the rod 1 reaches the base 3. This constant value is attained when the rod 1 has been inserted into the tube 2 by a distance approximately equal to the internal diameter of the tube 2, and so in order that the mounting will transmit a substantially constant force the rod 1 is initially inserted into the tube 2 by this distance, whereupon the mounting is ready for use. In operation if either the rod 1 or the base 3 receives shock of sufficient magnitude the rod 1 is forced further into the tube 2 with resultant deformation thereof. In the embodiment of Fig. 4, a plurality of rods 4 and tubes 5, both of mild steel are positioned between a support 6 and a base-plate 8. The portion 9 of each rod 4 that deforms the respective tube 5 is frusto-conical and below the portion 9 there is an extension 10 which tapers from a diameter substantially equal to the diameter of the tube 5 to a diameter slightly less. A rod 12 screwed into the base-plate 8 passes through a nylon plug 13 into an axial bore 11 in the rod 12 and acts to maintain each rod 4 in position in the respective tube 5. In the embodiment of Fig. 5 is shown a double acting attentuator which will operate whether shaft 20 moves upward or downward relative to the tube 21. The shaft 20 has a portion 22 of approximately the internal diameter of the tube 21, a portion 23 of larger diameter and an optional portion 24 of tapered configuration. The tube 21 is formed of two parts welded together with a backing ring 25. In a further attenuator (not shown) three tubes and three rods are arranged in respective pairs as in Fig. 1 and the tubes are swaged to a base-plate and the rods are screwed to a top-plate. The upper end of the attenuator is covered with low friction material so that the rods move axially with respect to the tubes even if the shock deflection is oblique to the upper surface. Thin metal straps bent slightly outwardly at a position near their centres are secured between the upper and lower ends of the attenuator and act to maintain the rods and tubes in position until a shock is received whereupon the straps buckle. As a further alternative, frictional means, such as a rod secured to one of the members and being an interference fit with a bore in the other member, act to prevent relative movement between the members when the shock force is below a certain value.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1743970 | 1970-04-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1351735A true GB1351735A (en) | 1974-05-01 |
Family
ID=10095234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1351735D Expired GB1351735A (en) | 1970-04-13 | 1970-04-13 | Shock attenuators |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1351735A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1980001829A1 (en) * | 1979-02-23 | 1980-09-04 | Ugine Aciers | Novel kinetic energy absorber for moving bodies |
GB2202600A (en) * | 1987-03-24 | 1988-09-28 | Boart | Yielding rock bolt |
EP0366627A1 (en) * | 1988-10-26 | 1990-05-02 | Fip Industriale S.P.A. | Mechanical power dissipating and load limiting device for coupling structural elements, in particular for aseismatically protecting bridges, viaducts, buildings and the like |
EP0477144A1 (en) * | 1990-08-30 | 1992-03-25 | Marco Carcassi | Dissipative device for safeguarding a structure against a dynamic stress |
GB2302578B (en) * | 1995-06-23 | 1999-02-17 | R G Manufacturing Ltd | Nudge bar and energy absorbing device |
EP2036799A1 (en) * | 2007-09-11 | 2009-03-18 | Voith Patent GmbH | Replacement energy consumption unit, in particular for use in combination with a buffer |
DE102014112065A1 (en) * | 2014-08-22 | 2016-02-25 | Bundesrepublik Deutschland, Vertreten Durch Den Bundesminister Für Wirtschaft Und Energie, Dieser Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung (Bam) | Protective component for use as a shock absorber |
-
1970
- 1970-04-13 GB GB1351735D patent/GB1351735A/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1980001829A1 (en) * | 1979-02-23 | 1980-09-04 | Ugine Aciers | Novel kinetic energy absorber for moving bodies |
FR2449561A2 (en) * | 1979-02-23 | 1980-09-19 | Ugine Aciers | NEW KINETIC ENERGY ABSORBING DEVICE FOR MOBILES |
GB2202600A (en) * | 1987-03-24 | 1988-09-28 | Boart | Yielding rock bolt |
EP0366627A1 (en) * | 1988-10-26 | 1990-05-02 | Fip Industriale S.P.A. | Mechanical power dissipating and load limiting device for coupling structural elements, in particular for aseismatically protecting bridges, viaducts, buildings and the like |
EP0477144A1 (en) * | 1990-08-30 | 1992-03-25 | Marco Carcassi | Dissipative device for safeguarding a structure against a dynamic stress |
GB2302578B (en) * | 1995-06-23 | 1999-02-17 | R G Manufacturing Ltd | Nudge bar and energy absorbing device |
EP2036799A1 (en) * | 2007-09-11 | 2009-03-18 | Voith Patent GmbH | Replacement energy consumption unit, in particular for use in combination with a buffer |
WO2009034097A1 (en) * | 2007-09-11 | 2009-03-19 | Voith Patent Gmbh | Replaceable energy absorbing structure, especially for use in combination with a buffer |
US8297419B2 (en) | 2007-09-11 | 2012-10-30 | Voith Patent Gmbh | Interchangeable energy-absorbing unit, in particular for use in combination with a buffer |
DE102014112065A1 (en) * | 2014-08-22 | 2016-02-25 | Bundesrepublik Deutschland, Vertreten Durch Den Bundesminister Für Wirtschaft Und Energie, Dieser Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung (Bam) | Protective component for use as a shock absorber |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |