WO2020197420A1 - Amortisseur de chocs de sécurité - Google Patents

Amortisseur de chocs de sécurité Download PDF

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Publication number
WO2020197420A1
WO2020197420A1 PCT/PL2020/000028 PL2020000028W WO2020197420A1 WO 2020197420 A1 WO2020197420 A1 WO 2020197420A1 PL 2020000028 W PL2020000028 W PL 2020000028W WO 2020197420 A1 WO2020197420 A1 WO 2020197420A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
safety
shock absorber
eye
rod
Prior art date
Application number
PCT/PL2020/000028
Other languages
English (en)
Inventor
Grzegorz ŁASKIEWICZ
Maciej MICHAŁOWSKI
Original Assignee
PROTEKT - ŁASKIEWICZ Grzegorz
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 PROTEKT - ŁASKIEWICZ Grzegorz filed Critical PROTEKT - ŁASKIEWICZ Grzegorz
Publication of WO2020197420A1 publication Critical patent/WO2020197420A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
    • A62B35/04—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion incorporating energy absorbing means
    • 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
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/12—Attachments or mountings
    • F16F1/128—Attachments or mountings with motion-limiting means, e.g. with a full-length guide element or ball joint connections; with protective outer cover
    • 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
    • F16F2230/0023—Purpose; Design features protective

Definitions

  • the subject of the invention is a safety shock absorber, used as a part in the security chain for people working at heights for the depreciation of forces acting on the human body in the event of a fall from the height of the person working there who has personal protective equipment.
  • the description of the application of the Polish invention No. P.386283 presents a safety shock absorber in the form of a self-locking device, in which on the surface of the drum, on which the safety tape is wound, there are elements reducing the diameter of the drum at the moment of sudden jerking of the safety tape wound on the drum.
  • the drum has teeth on the surface, placed on the cylindrical surface of the drum along the forming.
  • On the axis is placed the drum on which the safety tape is wound in several layers.
  • the safety tape has a loop at the end strapping the axis* thus the loop forms the fixed end of the safety tape.
  • the free end of the safety tape protrudes from the self-locking device casing, worker with personal protective equipment in the form of safety harnesses connects to it.
  • the device During normal operation at height, the device is attached to a fixed construction point, and the layers of safety tape with the drum rotate around the axis. The free end of the tape slides out of the device or is pulled into it depending on the change in worker distance from the attachment point of the device. Constant tension of the safety tape is provided by a spiral spring inserted in the device.
  • Constant tension of the safety tape is provided by a spiral spring inserted in the device.
  • the teeth on the cylindrical surface of the 2 drum break out.
  • the diameter of the drum wrap around the layers of the safety tape decreases and these subsequent layers slide over each other, adapting their diameter to the reduced diameter of the drum.
  • the kinetic energy of a person's fall is converted into friction work of individual layers of safety tape, which leads to a gentle downward movement.
  • the safety shock absorber is composed from two pieces of textile tape, folded approximately in half. The layers of these folded pieces are joined together by safety seams, and the free ends of both pieces are joined together so that there are upper and lower connection eyes at the connection points.
  • the total energy of the fall is converted into the work needed to break the safety seams that connect the layers of the tape.
  • the safety shock absorber according to the invention is in the form of a rod coiled in the shape of a spring which the upper end coils and lower end coils are the eyes for incorporation into the safety chain.
  • Inside the spring there is a folded safety cable, which is connected to the safety chain parallel to the spring.
  • Upper eye and the lower eye of the safety cable are coaxial with the eyes formed by the upper end coils and the lower end coils of the spring.
  • the distance between the upper and lower eyes of the safety cable in the extended state is at most equal to the length of the spring rod in the straightened state.
  • the rod from which the spring is made is so selected that during normal use the spring extends only within the elasticity of the material from which it is made.
  • the shock absorber is placed in a protective casing in the form of a tube with a lower dome and an upper dome. From the shock absorber casing, only the eyes formed by the upper and lower end coils of the spring and coaxial eyes of the safety cable protrude through the slots in the domes.
  • the lower dome is permanently connected to the pipe, while the upper dome is connected detachably to the pipe.
  • shock absorber according to the invention is very short and therefore does not significantly extend the safety chain. Its particular suitability will be demonstrated later in the description of the embodiment.
  • fig. 1 shows a complete safety chain intended to be suspended from a fixed construction point, including the shock absorber according to the invention
  • fig. 2 shows the shock absorber itself in a 3 side view
  • fig. 3 shows the shock absorber in a second side view with a partial cross section to show the safety cable
  • fig. 4 is a graph showing the length of the spring rod versus the force acting on the shock absorber.
  • a security chain is formed from the self-locking device 1 (with a built-in braking mechanism), from the casing protruding the end of the rope 4, having at the end a connecting eye 5, in which the upper end of the shock absorber is mounted 2.
  • the shock absorber 2 using the eye 13 there is a snap-hook 3 for attachment to the harness employee safety.
  • the rope 4 unwinds from the drum of the selflocking device 1 as the worker moves away and winds on it automatically when the worker approaches the self-locking device 1.
  • the safety shock absorber 2 is a rod coiled into the shape of a spring 6, which the upper end coils 7 are bent and threaded through the connecting eye 5 of the rope 4, the lower end coils 8 are also bent and threaded through the connecting eye of the snap-hook 3, in this version they are threaded through the eye of the buckle 12, connecting the lower end of the shock absorber 2 with the eye 13 of the snap- hook 3.
  • the spring 6 is rolled from such a thick rod that it behaves like a rod during normal use, it extends to elasticity of the material it is made of. The maximum spring extension is then 25mm. As you can see, in the ready to use state the shock absorber 2 is short, it does not significantly extend the security chain
  • a folding safety cable 9 which upper eye 10 is fixed in the connecting eye 5 of rope 4 (it is coaxial with the eye formed by the upper end coils 7 of spring 6), and lower eye 11 is fixed in the clamp 12 (and is coaxial with the connecting eye formed by the lower, end coils 8 of the spring 6).
  • the distance between the upper 10 and lower 11 eyes of the securing cord 9 in the unfolded state is at most equal to the length of the spring rod 6 in the straightened state. Therefore the safety cable 9 is connected to the safety chain parallel to the springs 6. Thanks to this, in case the force straightening the spring 6 the cable 9 additionally secures for proper operation of safety chain.
  • the shock absorber 2 is placed in a protective casing in the form of a pipe 14 with a lower dome 15 and an upper dome 16. Most often, the lower dome 15 is permanently connected to the pipe 14, while the upper dome 16 is connected to the pipe 14 detachably. From the shock absorber casing 2, through the dome’s slots 15 and 16, protrude only the eyes formed by the upper and lower, final coils 7 and 8 of the spring 6 and coaxial with 4 them eyes 10 and 11 of the safety cable 9.
  • the shock absorber casing 2 performs two tasks - on one side provides protection of the spring 6 and cable 9 against contamination and damage, and on the other hand facilitates the use of the shock absorber.
  • the casing allows the shock absorber 2 to slide freely through the sharp edges of roofs, load-bearing structures and gutters.
  • the shock absorber would get caught in the recesses, the movement of the cable 4 would take place with jams, with stops. And so, the domes 15 and 16 of the casing cause the shock absorber 2 to slide easily in both directions over all edges.
  • the upper dome 16 which is connected to the pipe 14 detachably, detaches from it and the spring 6 straightens and the fall slows down.
  • the casing fragmented by the occurrence of large forces in the system, immediately indicates the need to take the entire chain out of service.
  • the use of a safety chain with a shock absorber according to the invention is no different from the use of known safety chains.
  • the worker suspends the self-locking device 1 to a fixed construction point and starts working.
  • the worker By changing the position relative to the point of the fixed structure, the worker while moving away causes the retraction of the rope 4 from the rope drum of the self-locking device 1 , while approaching the point of the fixed structure the spiral spring located inside the self-locking device 1 causes the rope to wind automatically 4.
  • the unwound rope 4 increases the rotation of the rope drum of the self-locking device 1, which results in a mild slowing down of the fall, because this is how the disc brake of the self-locking device 1 works.
  • the spring 6 behaves like a rod during normal use, and therefore extends only within the elasticity of the material from which it is made.
  • the maximum spring extension is then 25mm with a extending force of approx. 1.5 kN.
  • the spring rod 6 gradually deforms within the plasticity of the material until it breaks at a force of approx. 21kN, when only the safety cable 9 works in the safety chain.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Lowering Means (AREA)

Abstract

L'objet de la présente invention est un amortisseur de chocs de sécurité, utilisé en tant que partie dans la chaîne de sécurité pour des personnes travaillant à des hauteurs pour la dépréciation des forces agissant sur le corps humain en cas de chute de la hauteur de la personne travaillant sur celui-ci qui a un équipement de protection personnel. Une chaîne de sécurité est formée à partir du dispositif autobloquant (1), de l'amortisseur de chocs (2) et du mousqueton (3). L'amortisseur de chocs de sécurité (2) est une tige enroulée sous la forme d'un ressort (6), les bobines d'extrémité supérieure (7) étant courbées et filetées à travers l'œil de liaison (5) de la corde (4), les bobines d'extrémité inférieure (8) sont également courbées et filetées à travers l'œil de liaison du mousqueton (3), dans cette version, ils sont enfilés à travers l'œil de la boucle ( (12)), reliant l'extrémité inférieure de l'amortisseur de chocs (2) à l'œil (13) du mousqueton (3). Le ressort (6) est enroulé à partir d'une telle tige épaisse qu'il se comporte comme une tige pendant une utilisation normale, il s'étend jusqu'à l'élasticité du matériau dont il est constitué. À l'intérieur du ressort (6) se trouve un câble de sécurité (9) pliable, dont l'œil supérieur (10) est fixé dans l'œil de liaison (5) de la corde (4), il est coaxial à l'œil formé par les bobines d'extrémité supérieure (7) du ressort 6), et l'œil inférieur (11) est fixé dans la pince (12) et est coaxial avec l'œil de liaison formé par les bobines d'extrémité inférieure (8) du ressort (6). La distance entre les yeux supérieur (10) et inférieur (11) du cordon de fixation (9) dans l'état déplié est au plus égale à la longueur de la tige de ressort (6) dans l'état tendu. Par conséquent, le câble de sécurité (9) est relié à la chaîne de sécurité parallèle au ressort (6).
PCT/PL2020/000028 2019-03-27 2020-03-16 Amortisseur de chocs de sécurité WO2020197420A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL42490619 2019-03-27
PLP.424906 2019-03-27

Publications (1)

Publication Number Publication Date
WO2020197420A1 true WO2020197420A1 (fr) 2020-10-01

Family

ID=72612053

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/PL2020/000028 WO2020197420A1 (fr) 2019-03-27 2020-03-16 Amortisseur de chocs de sécurité

Country Status (1)

Country Link
WO (1) WO2020197420A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR893564A (fr) * 1943-01-04 1944-08-04 Ressort extensible indéformable
JPS4870428U (fr) * 1971-12-08 1973-09-05
JPS58171153U (ja) * 1982-05-13 1983-11-15 藤井電工株式会社 緩衝装置を備えた安全帯
DD239446A1 (de) * 1985-07-18 1986-09-24 Potsdam Energiekombinat Bruch- und ueberlastungssicherung fuer zugfedern
US5332071A (en) * 1993-03-09 1994-07-26 Sinco Incorporated Shock absorber for safety cable system
JP2007029699A (ja) * 2005-06-24 2007-02-08 Nissei Metals Co Ltd 電気製品や家具等の転倒防止具
RU61612U1 (ru) 2006-09-18 2007-03-10 ФГОУ ВПО Рязанская государственная сельскохозяйственная академия имени профессора П.А. Костычева Приспособление для замены режущих накладок
CN108286577A (zh) * 2018-02-01 2018-07-17 扬州西湖圆柱弹簧厂 一种抗拉伸挂钩弹簧
WO2019043265A1 (fr) * 2017-09-04 2019-03-07 Alf Kristian Fjelldal Structure d'absorption d'énergie pour une ligne d'attache, et ligne d'attache comprenant celle-ci

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR893564A (fr) * 1943-01-04 1944-08-04 Ressort extensible indéformable
JPS4870428U (fr) * 1971-12-08 1973-09-05
JPS58171153U (ja) * 1982-05-13 1983-11-15 藤井電工株式会社 緩衝装置を備えた安全帯
DD239446A1 (de) * 1985-07-18 1986-09-24 Potsdam Energiekombinat Bruch- und ueberlastungssicherung fuer zugfedern
US5332071A (en) * 1993-03-09 1994-07-26 Sinco Incorporated Shock absorber for safety cable system
JP2007029699A (ja) * 2005-06-24 2007-02-08 Nissei Metals Co Ltd 電気製品や家具等の転倒防止具
RU61612U1 (ru) 2006-09-18 2007-03-10 ФГОУ ВПО Рязанская государственная сельскохозяйственная академия имени профессора П.А. Костычева Приспособление для замены режущих накладок
WO2019043265A1 (fr) * 2017-09-04 2019-03-07 Alf Kristian Fjelldal Structure d'absorption d'énergie pour une ligne d'attache, et ligne d'attache comprenant celle-ci
CN108286577A (zh) * 2018-02-01 2018-07-17 扬州西湖圆柱弹簧厂 一种抗拉伸挂钩弹簧

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