WO2009063003A1 - Dispositif de sécurité (10, 110) pour amortisseur/ressort - Google Patents

Dispositif de sécurité (10, 110) pour amortisseur/ressort Download PDF

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Publication number
WO2009063003A1
WO2009063003A1 PCT/EP2008/065463 EP2008065463W WO2009063003A1 WO 2009063003 A1 WO2009063003 A1 WO 2009063003A1 EP 2008065463 W EP2008065463 W EP 2008065463W WO 2009063003 A1 WO2009063003 A1 WO 2009063003A1
Authority
WO
WIPO (PCT)
Prior art keywords
longitudinally elongated
spring
unit
elongated element
breakable partition
Prior art date
Application number
PCT/EP2008/065463
Other languages
English (en)
Inventor
Augusto Cappeller
Massimo Fiorese
Daniel Fantinato
Original Assignee
Special Springs S.R.L.
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 Special Springs S.R.L. filed Critical Special Springs S.R.L.
Publication of WO2009063003A1 publication Critical patent/WO2009063003A1/fr

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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/43—Filling or drainage arrangements, e.g. for supply of gas
    • 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
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0218—Mono-tubular units
    • 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
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/43—Filling or drainage arrangements, e.g. for supply of gas
    • F16F9/435—Filling or drainage arrangements, e.g. for supply of gas via opening in cylinder wall
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/06—Fluid filling or discharging
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/24—Detecting or preventing malfunction, e.g. fail safe

Definitions

  • the present invention relates to a safety device for spring/damper units.
  • Spring/damper units generally have a tubular containment jacket that is closed hermetically at one end by a bottom provided with a gas filling valve and at the opposite end by a head that is perforated for the passage of a stem with a piston, which performs a translational motion within such jacket; the jacket, the bottom and the head define the stroke chamber for the piston, while such piston, together with the jacket and the bottom, forms the chamber for compression and expansion of the gas that is present therein within the head.
  • spring/damper units are used typically but not exclusively also in situations, such as molds, die-forming presses, and the like, in which they can be subjected to pressures that might damage them; such damage can cause the spring/damper unit to become unusable, forcing replacement and interruption of the machine or system in which it is placed to work, but such damage can also be such as to harm an operator who is in the vicinity, as in the case of an explosion due to overpressure or breakage with uncontrolled escape of pressurized gas.
  • This damage can occur mainly for two reasons.
  • a first reason is linked to a retracting stroke of the stem with the piston that is longer than allowed from the constructive standpoint for that specific spring/damper unit.
  • overtravel which can be caused for example by an unexpected increase in load on the stem of the unit, which forces such stem to retract into the body of the unit for an unexpected length, can generate an overpressure inside the unit which the structure of the unit as a whole might be unable to sustain; the unit may thus splay or break at the connecting points between the parts that compose it, or its sealing elements might fail, and in all the cited cases an unexpected, unwanted and dangerous rapid escape of gas can occur.
  • a second reason for damage may occur due to the inflow of lubricating liquids, by which such spring/damper units can be affected in many of their applications, such as die-forming presses or the like, within the compression and expansion chamber in which the gas is compressed by the movement of the piston.
  • the aim of the present invention is to provide a safety device for spring/damper units that is capable of making safe and reliable a spring/damper unit both in case of overtravel of the stem-piston and in cases of overpressure caused by other unwanted events, such as for example seepage of incompressible fluid into the jacket of the unit.
  • an object of the present invention is to provide a safety device that is simple to provide and assemble.
  • Another object of the present invention is to provide a safety device with which even known types of spring/damper unit can be equipped. Another object of the present invention is to provide a safety device which, if activated, can be replaced easily with another identical one.
  • a safety device for spring/damper units characterized in that it comprises at least one part of the bottom or jacket of a spring/damper unit provided with a breakable partition that is subjected to the pressure determined by the gas compressed within a compression and expansion chamber of a spring/damper unit, said chamber being formed between said bottom, said jacket and the piston of the unit, said breakable partition having such a thickness as to break in the presence of a pressure inside said chamber that is greater than, or equal to, a preset pressure value, said breakable partition being associated with a longitudinally elongated element that lies within said compression and expansion chamber for such a length as to affect part of said piston during its descent before it performs a stroke that exceeds the predefined stroke, said longitudinally elongated element being supported by way of yielding supporting means adapted to allow, in the presence
  • Figure 1 is a sectional side view of a spring/damper unit provided with a safety device according to the invention in a first embodiment thereof;
  • Figure 2 is a sectional side view of a detail of the device according to the invention.
  • Figure 3 is a transverse sectional view of the device according to the invention.
  • Figure 4 is a perspective view of part of the striker;
  • Figure 5 is a sectional side view of a spring/damper unit provided with a device according to the invention in a second embodiment thereof;
  • Figure 6 is an enlarged-scale view of a detail of Figure 5, illustrating the device according to the invention in a second embodiment thereof. Ways of carrying out the Invention
  • a safety device for spring/damper units is generally designated by the reference numeral 10.
  • the safety device 10 comprises a part of a bottom 1 1 of a spring/damper unit 12, which is provided with a breakable partition 13.
  • the breakable partition 13 is designed to be subjected to the pressure determined by the gas that is compressed within a chamber 14 for compression and expansion of the spring/damper unit 12, the chamber 14 being formed between the bottom 1 1 , a jacket 1 1a and a piston 15 of the spring, as shown in Figure 1.
  • the breakable partition 13 has such a thickness that it breaks in the presence of a pressure inside the chamber 14 that is higher than, or equal to, a preset pressure value.
  • a longitudinally elongated striker 16 is positioned, by way of yielding supporting means described in greater detail hereinafter, at and proximate to the breakable partition 13.
  • the longitudinally elongated striker 16 has a stem 17 that protrudes into the compression and expansion chamber 14 for such a length as to affect a part of the piston 15 during its descent before the piston 15 performs a stroke that exceeds the predefined one.
  • the yielding means that support the longitudinally elongated striker 16 allow, in the presence of a preset force that pushes on the stem 17 in the direction of the longitudinal axis of the unit 12, a movement of the striker 16 so as to break the breakable partition 13.
  • the part of the bottom 1 1 is constituted by a body 18 that can be fixed detachably to the bottom 11 and has a first compartment 19, which opens onto the outside of the unit 12, and a second compartment 20, which is open onto the chamber 14; the two compartments 19, 20 are mutually separated by the breakable partition 13.
  • the body 18 is constituted by a plug that is threaded externally to be screwed into a corresponding complementarily threaded through hole 21 formed in the bottom 11.
  • the first compartment 19 is provided by the hexagonal maneuvering recess formed on a head 18a of the body 18, while the second compartment 20 is shaped to accommodate a spike 22 of the longitudinally elongated striker 16.
  • the yielding means for supporting the longitudinally elongated element 16 proximate to the breakable partition 13 are constituted by an internally threaded collar 23, which is designed to receive by screw coupling a corresponding threaded portion 24 of the striker 16.
  • the threaded portion 24 extends contiguously with the spike 22, and at least one groove 25 is provided thereon which is adapted to determine, when the threaded portion 24 is screwed onto the collar 23, a channel 26 designed to connect the chamber 14 and the second compartment 20.
  • the second compartment 20 is substantially cylindrical, and the spike
  • the threaded portion 24 has four grooves 25, which run parallel in the direction of the axis of the longitudinally elongated striker 16 and are provided symmetrically with respect to such axis.
  • the body 18, to which the striker 16 has already been screwed is screwed to the bottom 11.
  • the gas that is in the chamber 14 passes through the channels 26 into the second compartment 20, thus pressurizing the breakable partition 13.
  • the device is characterized in that the breakable partition 113 is provided on a part of the jacket I l ia, instead of on a part of the bottom 1 1 1 as in the first embodiment described above.
  • This part of the jacket I l ia is provided by a body 118 that can be fixed reversibly to the jacket I l ia, from which the longitudinally elongated element 1 16 extends.
  • the body 118 and the longitudinally elongated element 116 are crossed by a dead hole 119, which runs along the direction of the axis of the longitudinal element 116.
  • the dead hole 119 is open onto the outside of the unit 112 and is closed toward the inside of the unit 112 by the partition 1 13.
  • the longitudinally elongated element 116 protrudes monolithically from the reversibly fixable body 1 18 and toward the interior of the chamber 1 14.
  • One groove 125 for initiating breakage under the thrust of the piston 1 15 is formed at a transverse cross-section of the longitudinal element 116.
  • the body 118 is a plug that is threaded externally to be screwed into a corresponding complementarily threaded through hole 121.
  • the outer compartment 119a of the hole 119 is provided by hexagonal maneuvering recess formed on the body 1 18.
  • the operation of the device 110 entails that as the piston 1 15 descends, if it continues descent by going beyond the limit of its preset stroke, it encounters the longitudinally elongated element 116, which protrudes at right angles to the jacket I l ia into the chamber 1 14.
  • the overtravel of the piston 115 causes the impact of the piston 1 15 against the longitudinal element 1 16 and the breakage of the latter at the height of the fracture groove 125.
  • the pressurized gas is free to discharge outside the unit 1 12 through the hole 119.
  • the present invention provides a safety device for spring/damper units that is capable of making a spring/damper unit safe and reliable both in case of overtravel of the piston and in cases of overpressure determined by other unwanted events, such as for example seepage of incompressible fluid into the jacket of the spring/damper unit.
  • the present invention provides a safety device 10 and 1 10 that is simple to manufacture and assemble, by way of the body 18 and 1 18, which can be provided in practice by a plug that can be screwed to the bottom 1 1 or to the jacket I l ia, and by way of the coupling between the body 18 and the longitudinally elongated striker 16, which is also provided by a threaded coupling, or by way of the coupling between the body 1 18 and the longitudinally elongated element 1 16, these last being monolithic.
  • the present invention provides a safety device with which even known types of spring/damper unit can be equipped.
  • the present invention provides a safety device which, if activated, can be replaced easily with another identical one, since the integrity of the spring/damper unit 12 and 1 12 is not compromised by malfunction and the device 10 and 1 10 can be replaced easily by unscrewing the body 18 and 1 18.
  • the present invention provides a safety device for spring/damper units that can be manufactured cheaply with known systems and technologies.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
  • Springs (AREA)

Abstract

L'invention porte sur un dispositif de sécurité (10, 110) pour amortisseur/ressort comprenant au moins une partie de la base (11, 111) ou de la chemise (11a, 111a) de l'amortisseur/ressort (12, 112) munie d'une paroi ruptible (13, 113) soumise à la pression déterminée par gaz comprimé dans la chambre de compression (14, 114) de l'amortisseur/ressort; ladite chambre (14, 114) est comprise entre la base (11, 111), la chemise (11a, 111a) et le piston de l'amortisseur/ressort. La paroi ruptible (13, 113) présente une épaisseur telle qu'elle se rompt on présence d'une pression dans la chambre (14, 114) supérieure ou égale à une valeur préétablie. La paroi ruptible (13, 113) est par ailleurs associée à un élément allongé (16, 116) placé dans la chambre (14, 114) et d'une longueur telle qu'il est percuté une partie du piston (15, 115) pendant sa descente avant que sa course ne dépasse une valeur prédéfinie. Ledit élément allongé (16, 116) est fixé à un support ruptible qui en présence d'une force préétablie le poussant dans la direction de fonctionnement de l'amortisseur (12, 112) et le déplace de manière à rompre la paroi ruptible (13, 113) ou à le rompre lui-même, afin de créer dans la base (11, 111) ou dans la chemise (11a, 111a) une ouverture d'échappement du gaz vers l'extérieur.
PCT/EP2008/065463 2007-11-13 2008-11-13 Dispositif de sécurité (10, 110) pour amortisseur/ressort WO2009063003A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000378A ITPD20070378A1 (it) 2007-11-13 2007-11-13 Dispositivo di sicurezza per molle a gas
ITPD2007A000378 2007-11-13

Publications (1)

Publication Number Publication Date
WO2009063003A1 true WO2009063003A1 (fr) 2009-05-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/065463 WO2009063003A1 (fr) 2007-11-13 2008-11-13 Dispositif de sécurité (10, 110) pour amortisseur/ressort

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IT (1) ITPD20070378A1 (fr)
WO (1) WO2009063003A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010102994A1 (fr) 2009-03-10 2010-09-16 Special Springs S.R.L. Actionneur de bouteille de gaz avec dispositif de sécurité de dépassement de course
ITPD20120057A1 (it) * 2012-03-01 2013-09-02 Special Springs Srl Molla a gas con dispositivo di sicurezza per extracorsa
EP2634451A1 (fr) * 2012-03-01 2013-09-04 Special Springs S.r.l. Actionneur à vérin à gaz avec dispositif de sécurité de dépassement de course
ES2405937R1 (es) * 2011-11-29 2013-10-07 Tecn Aplic S De Presion S L Diseno de cilindro-piston a gas
EP2778465A1 (fr) * 2013-03-15 2014-09-17 Dadco, Inc. Décharge de pression de dépassement de course pour ressort à gaz
US9551394B2 (en) 2013-03-15 2017-01-24 Dadco, Inc. Overtravel pressure relief for a gas spring
ITUA20164635A1 (it) * 2016-06-24 2017-12-24 Special Springs Srl Molla a gas con dispositivo di sicurezza
WO2020191351A1 (fr) * 2019-03-20 2020-09-24 Dadco, Inc. Ressort à gaz avec décompression sur dépassement de course
CN113357300A (zh) * 2021-06-03 2021-09-07 东风汽车集团股份有限公司 一种空气弹簧及汽车
IT202100008618A1 (it) * 2021-04-07 2022-10-07 Special Springs Srl Molla a gas
EP4071378A1 (fr) 2021-04-07 2022-10-12 Special Springs S.r.l. Ressort à gaz

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1241373A1 (fr) * 2001-02-23 2002-09-18 Orflam Industries Ressort à gaz muni d'un organe de sécurité inviolable
WO2003042571A1 (fr) * 2001-11-12 2003-05-22 Strömsholmen Ab Dispositif sur ensemble piston-cylindre a accumulation d'energie
EP1420187A1 (fr) * 2002-11-12 2004-05-19 Azol-Gas, s.l. Amortisseur à gaz

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1241373A1 (fr) * 2001-02-23 2002-09-18 Orflam Industries Ressort à gaz muni d'un organe de sécurité inviolable
WO2003042571A1 (fr) * 2001-11-12 2003-05-22 Strömsholmen Ab Dispositif sur ensemble piston-cylindre a accumulation d'energie
EP1420187A1 (fr) * 2002-11-12 2004-05-19 Azol-Gas, s.l. Amortisseur à gaz

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010102994A1 (fr) 2009-03-10 2010-09-16 Special Springs S.R.L. Actionneur de bouteille de gaz avec dispositif de sécurité de dépassement de course
ES2405937R1 (es) * 2011-11-29 2013-10-07 Tecn Aplic S De Presion S L Diseno de cilindro-piston a gas
ITPD20120057A1 (it) * 2012-03-01 2013-09-02 Special Springs Srl Molla a gas con dispositivo di sicurezza per extracorsa
EP2634451A1 (fr) * 2012-03-01 2013-09-04 Special Springs S.r.l. Actionneur à vérin à gaz avec dispositif de sécurité de dépassement de course
US9291265B2 (en) 2012-03-01 2016-03-22 Special Springs S.R.L. Gas cylinder actuator with overtravel safety device
US9726287B2 (en) 2012-03-01 2017-08-08 Special Springs S.R.L. Gas cylinder actuator with overtravel safety device
US9874281B2 (en) 2012-03-01 2018-01-23 Special Springs S.R.L. Gas cylinder actuator with overtravel safety device
EP2778465A1 (fr) * 2013-03-15 2014-09-17 Dadco, Inc. Décharge de pression de dépassement de course pour ressort à gaz
CN104047988A (zh) * 2013-03-15 2014-09-17 达德科公司 用于气弹簧的超行程压力释放
US9347510B2 (en) 2013-03-15 2016-05-24 Dadco, Inc. Overtravel pressure relief for a gas spring
US9551394B2 (en) 2013-03-15 2017-01-24 Dadco, Inc. Overtravel pressure relief for a gas spring
CN107542721A (zh) * 2016-06-24 2018-01-05 异型弹簧有限公司 具有安全装置的气缸致动器
EP3260726A1 (fr) * 2016-06-24 2017-12-27 Special Springs S.r.l. Actionneur de vérin à gaz avec dispositif de sécurité
ITUA20164635A1 (it) * 2016-06-24 2017-12-24 Special Springs Srl Molla a gas con dispositivo di sicurezza
US10619695B2 (en) 2016-06-24 2020-04-14 Special Springs S.R.L. Gas cylinder actuator with safety device
CN107542721B (zh) * 2016-06-24 2020-10-23 异型弹簧有限公司 具有安全装置的气缸致动器
WO2020191351A1 (fr) * 2019-03-20 2020-09-24 Dadco, Inc. Ressort à gaz avec décompression sur dépassement de course
US11460087B2 (en) 2019-03-20 2022-10-04 Dadco, Inc. Gas spring with overtravel pressure relief
TWI836036B (zh) * 2019-03-20 2024-03-21 美商黛寇公司 具有超程釋壓功能之氣彈簧
IT202100008618A1 (it) * 2021-04-07 2022-10-07 Special Springs Srl Molla a gas
EP4071378A1 (fr) 2021-04-07 2022-10-12 Special Springs S.r.l. Ressort à gaz
WO2022215027A1 (fr) * 2021-04-07 2022-10-13 Special Springs S.R.L. Ressort à gaz
US20220325770A1 (en) * 2021-04-07 2022-10-13 Special Springs S.R.L. Gas spring
CN113357300A (zh) * 2021-06-03 2021-09-07 东风汽车集团股份有限公司 一种空气弹簧及汽车

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