EP2872360A2 - Siège à absorption d'énergie - Google Patents

Siège à absorption d'énergie

Info

Publication number
EP2872360A2
EP2872360A2 EP13750748.9A EP13750748A EP2872360A2 EP 2872360 A2 EP2872360 A2 EP 2872360A2 EP 13750748 A EP13750748 A EP 13750748A EP 2872360 A2 EP2872360 A2 EP 2872360A2
Authority
EP
European Patent Office
Prior art keywords
energy absorbing
chair
mechanically
energy
axis
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Withdrawn
Application number
EP13750748.9A
Other languages
German (de)
English (en)
Inventor
Ingvar Eriksson
Dag Linderholm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safeseat IP AB
Original Assignee
Safeseat IP AB
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 Safeseat IP AB filed Critical Safeseat IP AB
Publication of EP2872360A2 publication Critical patent/EP2872360A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/4207—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces
    • B60N2/4214—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces longitudinal
    • B60N2/4228—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces longitudinal due to impact coming from the rear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42727—Seats or parts thereof displaced during a crash involving substantially rigid displacement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42727—Seats or parts thereof displaced during a crash involving substantially rigid displacement
    • B60N2/42736—Seats or parts thereof displaced during a crash involving substantially rigid displacement of the whole seat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42727—Seats or parts thereof displaced during a crash involving substantially rigid displacement
    • B60N2/42745—Seats or parts thereof displaced during a crash involving substantially rigid displacement of the back-rest
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42727—Seats or parts thereof displaced during a crash involving substantially rigid displacement
    • B60N2/42754—Seats or parts thereof displaced during a crash involving substantially rigid displacement of the cushion

Definitions

  • the present invention relates to a chair with an energy absorbing function for use preferably in vehicles.
  • the purpose of the chair is to reduce the risk of injury in an accident where the torso of the chair occupant is pressed against the backrest of the chair.
  • a common cause of whiplash injury is in car crashes when a motorist is hit from behind.
  • a motorist will hereinafter also be called the chair occupant.
  • An example of this situation is, therefore, when an overtaking vehicle collides with a vehicle ahead.
  • Another example is frontal collision where the chair occupant is pressed against the backrest by an expanding airbag.
  • a third example is frontal collision where the chair occupant is a child sitting in a child's seat facing the opposite direction of the car's direction of travel.
  • Phase 1 In the first phase (0-0.1 seconds) the vehicle in front will accelerate forward, which means that each backrest will push its occupant forward, wherein first the torso is accelerated (in the latter part of phase i), which causes the spine to be extended and compressed. As a consequence thereof pressure gradients in chair occupant's brain occur. High pressure occurs in the back of the brain and low pressures in the front part. Shear forces occur in the brain stem.
  • Phase 2 In the second phase (0.1 to 0.25 seconds), the spine is further stretched out. The head is accelerated and pushed back at or above the neck support. This can cause temporomandibular disorders (TMJ or TMD).
  • TMJ temporomandibular disorders
  • Phase 3 The third phase (from 0.25 to 0.4 seconds) achieves maximum head acceleration, the torso sinks back down into the seat and the head rotates forward. The backrest springs back and increases the speed of the chair occupant significantly.
  • Phase 4 In the fourth phase (0.4-0.5 seconds) the head, neck and torso are decelerated. High tensile and shear forces occur in the spine. High tensile forces also occur in the brain stem and the spinal cord.
  • DRFWS This solution, in turn resembles RFWMS, but with the difference that the spring-damper element is inclined 30 degrees to the horizontal plane as in DWMS.
  • An object of the present invention is thus to provide an improved chair to reduce the appearance of, or at least reduce the effect of, whiplash injuries.
  • a particular object of the present invention is thus to reduce the injury risk of whiplash injuries and the associated very high costs, by providing an appropriate energy-absorbing function in the chair.
  • This is accomplished by providing a chair according to the independent claims of the present invention.
  • Such a chair is thus arranged to, when the chair occupant's torso is pressed against the seat, transform a limited rotation of the backrest to a rectilinear motion.
  • the operating distance of the motion may in one embodiment be shifted up and used for energy transfer to an energy absorbing element adapted for the task.
  • the energy-absorbing element is thus adapted to store or accumulate energy in a harmless way (i.e., so that the risk of injury to the chair occupant is reduced). This reduces the accelerations and forces in the chair occupant's head and cervical spine, thereby significantly reducing the risk of injury.
  • an energy absorbing chair consisting of a seat, a backrest and an energy transferring device disposed in the chair, the energy transferring device comprising an energy absorbing element.
  • the energy transferring device comprising an energy absorbing element.
  • the backrest is pivotally connected with the seat around an axis parallel to the vehicle's transverse direction and as well as with the energy transferring device also around an axis parallel to the chair's transverse direction (i.e. about an axis parallel to the vehicle's transverse direction when the seat is installed in the correct direction in a car).
  • the energy transferring device is in turn pivotally connected to the seat around an axis parallel to the transverse direction of the chair. This enables the rotational movement of the backrest to be transformed into a rectilinear motion, which is utilized to transfer kinetic energy from the chair occupant to said energy absorbing element.
  • kinetic energy is transferred from the colliding car to the run-into car, which in turn through its backrest transfers it to the chair occupant.
  • the kinetic energy may thereby be transferred to an energy absorbing element via rotation of the backrest.
  • To accomplish this rotation of the backrest is transformed into a rectilinear motion, which is used for energy transfer to the energy absorbing element.
  • a chair whose function is based on translational motion and which enables the energy transmission rotation may be severely limited in order not to risk injuring passengers in the back seat (where the chair is used in the front seat).
  • a chair whose function enables a limitation of rotational movements and that despite these limitations provides an energy transfer at a large enough distance in order to obtain the desired effect, i.e. to reduce the appearance of, or at least reduce the effect of, whiplash injuries.
  • the energy transferring device is suitably fixed to the seat, pivotably about the third axis.
  • the energy transferring device may be fixable at a part, disposed outside of the chair, of the vehicle in which the chair is mounted, pivotably about the third axis.
  • Said energy transferring device may according to an embodiment comprise an upshifting mechanism, arranged for upshifting the distance of said rectilinear movement, yielding constructive advantages.
  • the chair may according to an embodiment be arranged such that the angle between a line between the backrest's both rotation points and a line between the energy transferring device's both points of rotation, seen in a plane whose normal is parallel to the vehicle's transverse direction, increases as the backrest rotates due to the torso of the chair occupant being pressed against the backrest during collision from behind.
  • the chair may according to an embodiment be arranged such that the energy absorbing element is disposed and oriented to enable the distance between the first axis and the second axis to become as large as possible. Thereby the length of the lever arm formed between the first and the second axes is maximized, whereby also the resulting linear movement of the energy transferring device is maximized with respect to the rotational movement about the first axis.
  • the kinetic energy from the chair occupant may according to an embodiment be transferred during said rectilinear motion to the energy absorbing element by means of a pushing force.
  • the kinetic energy from the chair occupant may according to an embodiment be transferred during said rectilinear motion to the energy absorbing element by means of a tensile force transferring element, which makes it possible to use simple structural elements for the energy transfer.
  • Said energy transferring device may according to an embodiment comprise a plate which is arranged in the seat and pivotally arranged in the same, which is simple to arrange and which does not require so much space.
  • Said energy transferring device may according to an embodiment comprise a slidably mounted member disposed in the longitudinal direction of the device, seen in a view along the vehicle.
  • the backrest may according to an embodiment be provided with a latch mechanism which is released at the initial phase of the moment of collision.
  • Said latch mechanism may according to an embodiment receive a signal from one or more sensors to be disengaged at a certain time after the moment of impact. The energy absorbing function is thus not activated under normal circumstances.
  • Said latch mechanism and the energy transmitting device may according to one embodiment be decoupled when the chair occupant wishes to set the seat for reasons of comfort, and that said rotary movement has a limited impact. There no active action (such as setting or turning on) of the chair occupant is thus required.
  • Said energy absorbing elements may be a band, a strap, a line, a rope, a wire, a solid material, a spring, a hydraulic damper, a gas spring or a flywheel; or combinations thereof.
  • the energy transferring devices enables the rotation of the backrest to be transformed into a linear movement, whose distance can be shifted up, yielding design benefits.
  • the energy absorbing function is in the chair disposed in a practical and cost effective manner through its compact, flat design, and use of simple construction elements.
  • the energy transferring device therefore does not affect the vehicle's structural performance in any substantial way, which also facilitates maintenance or replacement after activation.
  • the device is thus easy to maintain and can be replaced without the whole chair needing to be replaced.
  • the energy transferring device enables the kinetic energy of chair occupant to be transmitted to the energy absorbing element via a downshifted traction force. This enables the use of an easy and cost effective traction force transmitting elements for energy transfer.
  • Figures 1-6 are various views of a chair comprising an energy transferring device
  • Figures 7-10 illustrate an energy transferring device according to different embodiments for integration in a chair according to Figures 1-6.
  • Figure 1 shows a principled and stylized view of a chair la seen in a longitudinal view (the yz plane).
  • Figure 1 also shows a coordinate system based on the assembly of the chair la in a car 24.
  • the chair la comprises an energy transferring device 4 arranged in the seat 2 of the chair la.
  • the chair la thus comprises the following principle components, referring initially to Figure 1: a seat 2, i.e., the seat load bearing structure, a backrest 3, i.e., the back load bearing structure; as well as an energy transferring device 4, which is arranged in the seat 2 with the purpose of transferring kinetic energy from an imagined chair occupant (not illustrated), that in use is placed in the chair la, to an energy absorbing element 5 by a linear displacement during mechanical resistance.
  • the energy transferring device 4 thus comprises an energy absorbing element 5 (only schematically shown in Figure 1), i.e., the elements of the energy transferring device 4 that, in use, primarily accumulates or converts the kinetic energy transmitted from the chair occupant.
  • the energy absorbing element 5 is connected to a slidable element 6 which will be described below.
  • the torso of the chair occupant is pressed against the backrest 3.
  • the force arising between the backrest and the chair occupant can perform mechanical work, if the chair at this stage is allowed to translate, or if the backrest is allowed to rotate, in the presence of resistance.
  • This mechanical work can be transferred and accumulated.
  • the mechanical work ma be accumulated in a spiral spring, hydraulic cylinder, pneumatic cylinder, flywheel or in a solid or porous material.
  • This type of construction element is what it is referred to herein as "energy absorbing elements.”
  • energy absorbing element 5 examples are a solid or porous material, which collects the strain energy; a spring element, a hydraulic damper, a gas spring; a flywheel. These examples will be described in more detail
  • the backrest 3 is pivotally connected with the seat 2 in point A about an axis parallel to the transverse direction (x direction) of the chair la (and thus also the car 24) as well as with the energy transferring device 4 around
  • the device 4 is in turn pivotally arranged to the seat about a point C about an axis parallel with the transverse direction of the chair.
  • the energy transferring device 4 further comprises a slidably mounted element 6 (shown schematically in Figure 1) arranged in the longitudinal direction of the device 4 as seen in said yz plane.
  • a slidably mounted element 6 shown schematically in Figure 1 arranged in the longitudinal direction of the device 4 as seen in said yz plane.
  • the energy can be transferred, which reduces the forces and accelerations of the head and the cervical spine of the chair occupant.
  • the backrest 3 is rotatably disposed in the seat 2 at point A as well as in the energy transmission device 4 at point B at the same time as the device is rotatably fixed at point C and comprises a slidable element 6, the rotational movement of the backrest 3 will be transformed into a rectilinear movement whose distance is dependent on the distance between the rotation
  • the rotation ⁇ depends on the mechanical resistance in the energy absorbing element 4 and the amount of energy transmitted.
  • the energy transferring device is disposed and oriented to maximize the length of the lever arm formed between the points A and B. In Figure 1 this is illustrated by an angle ⁇ between a straight line passing through
  • An angle a between a straight line through the points A and B and a straight line between points B and C increases (i.e., a 2 > a when the backrest 3 rotates an angle ⁇ due to the torso of the chair occupant is pressed against the backrest 2 during collision whilst said element 6 is displaced.
  • said linear displacement is shifted up in order to provide constructive flexibility in terms of characteristics and dimensions of the energy absorbing element. This means that the transfer of energy from the chair occupant to the energy transferring element occurs at a longer distance.
  • Figure 2 shows a principled and stylized view of a chair lb seen in a longitudinal view (the yz plane).
  • Figure 2 also shows a coordinate system based on the assembly of the chair lb in a car 24.
  • the chair lb is in many respects similar to the chair la in Figure 1.
  • the chair lb thus comprises an energy transferring device 4 arranged in the seat 2 of the chair lb.
  • the chair la thus comprises the following principle components, referring initially to Figure 1: a seat 2, i.e., the seat load bearing structure, a backrest 3, i.e., the back load bearing structure; as well as an energy transferring device 4, which is arranged in the seat 2 with the purpose of transferring kinetic energy from an imagined chair occupant (not illustrated), that in use is placed in the chair la, to an energy absorbing element 5 by a linear displacement during mechanical resistance.
  • the energy transferring device 4 thus comprises an energy absorbing element 5 (only schematically shown in Figure 2), i.e., the elements of the energy transferring device 4 that, in use, primarily accumulates or converts the kinetic energy transmitted from the chair occupant.
  • the energy absorbing element 5 is connected to a slidable element 6 which will be described below.
  • FIG 2 shows a principal embodiment where the energy absorbing element 5 absorbs energy during influence of a compressive force when the backrest rotates due to the chair occupant being pressed against the backrest.
  • the slidable element 6 acts on the energy absorbing element 5, which in Figure 2 comprises a material 5b enclosed in a cylinder 5a.
  • the energy absorbing element 5 could also for example be any of the above-mentioned elements: a hydraulic damper, a gas spring, a spring element or combinations of these.
  • One or more energy transferring devices 4, each of which comprises an energy absorbing element 5, could then e.g. be placed in one or more tubes (or other hollow space) provided in the seat 2.
  • the rotation points B and C are disposed such that the angle ⁇ between a straight line passing through points B and C and a straight line parallel to the z direction is zero (where the z direction is parallel to the longitudinal direction of the chair lb), which may be an advantageous orientation for accommodation reasons (since the angle ⁇ is zero, it is not depicted in Figure 2). It is advantageous to have the rotation point B positioned as low as possible so as to maximize the lever arm defined by the distance between A and B. Orientation of the device such that ⁇ is substantially zero thus defines a special case. It is also advantageous if the angle ai between the lines A and B and between the lines B and C is substantially 90 degrees before the rotation of the backrest 3 because a rotation then yields maximum displacement in the element 6.
  • Figure 3 is a perspective view of the chair la, lb seen obliquely from above and from the front with the energy transferring device 4 indicated below the seat 2.
  • Figure 4 shows the chair la, lb and the device 4 in a view directly from behind (the xy plane).
  • Figure 5 shows the chair and the energy transferring device 4 in a side view (the yz plane). It is indicated that the backrest 3 has rotated from an initial more upright position to a more inclined
  • Figure 6 is a perspective view of the chair la, lb seen obliquely from the front, essentially in the xy plane.
  • the energy transferring device 4 is here seen rotatably provided in the front portion of the seat 2.
  • the energy transferring device 4 preferably comprises a link arm 7 pivotally mounted in the backrest 3 at point B.
  • the link arm can be bracket- shaped.
  • the energy transferring device 4 preferably comprises a slidably mounted element 8 which is fixed in the link arm 7.
  • the slidable element may be bifurcated.
  • the slidable element is preferably slidably disposed in plane parallel tracks 9 in a plate 10.
  • the plate 10 is pivotally mounted to the seat 2 at point C.
  • the backrest 3 can thereby be likened to a lever.
  • a pressure force F 2 will act on the yoke 7 and the pressing fork 8, which is moved a distance s in the direction of the force.
  • the rotation ⁇ which may be permitted is relatively limited with regards to any passengers in the back seat (i.e., when the chair la, lb is used as the front seat of the car 24) or with regards to any cargo space behind (i.e., when the chair la, lb is used as the back seat of the car 24).
  • the rotatable elements 12, 13 can thus be arranged in the slidable fork 8 as well as in the plate 10.
  • a tensile load transmitting element 14 is disposed in the plate 10 at point D and runs around the rotatable elements 12 and 13.
  • the rotatable elements may be replaced with slidable bodies that are fixed to the plate 10 and the fork 8 or are provided as integral parts of the plate 10 and the fork 8.
  • a tensile load transmitting element 14 may, analogously as described above, be fixed to the plate 10 and run along the fixed mounted or integrated elements' vertical sliding surfaces, which sliding surfaces can be coated with a low friction material.
  • rotatable elements 12 be mounted with rotary axes that are orthogonal to the plan of the plate 10. These rotatable elements 12 are displaced when the fork 8 is displaced as a result of rotation of the backrest 3.
  • the device 4 further comprises a number of elements 13 with axes of rotation orthogonal to the plane of plate 10 rotatably arranged in the plate 10.
  • a tensile load transmitting element 14 is fixed to the plate in point D and runs in the rotatable elements 12 and 13.
  • tensile load transmitting elements 4 are a strap, V-belt, belt, rope, wire, line, and ribbon.
  • the rotatable members may be a sprocket wheel. If the tensile load transmitting elements 4 is a strap, the rotatable members are pulleys, which will be readily understood by the skilled person.
  • the transfer of energy to the energy absorbing element 5 occurs over a longer distance under the influence of a lower power, it means that the dimensions of the energy absorbing element 5 can be reduced significantly, which also has practical importance because it thus becomes easier to integrate the energy transmitting device, including the energy absorbing element, in the chair.
  • Kinetic energy from the chair occupant may in fact be absorbed in many different structural members simultaneously.
  • a certain portion can be absorbed by the backrest 3 in the form of elastic strain energy, a certain portion as frictional energy (heat) in the joints and so on.
  • frictional energy heat
  • Example 1 relates to a tensile load bearing element as energy absorbing element and is illustrated in Figure 8.
  • Figure 8 shows an energy transferring device 4 which according to an embodiment disclosed below comprises a plate 10 adapted to be rotatably arranged in the seat 2.
  • a fork shaped element is slidably disposed in the plane of the plate.
  • a shift comprises a number of rotatable elements and a traction force transmitting element, such as a belt, running around the rotatable elements in order to shift up the displacement of the fork element.
  • the energy absorbing element comprises the tensile load transmitting element itself, which is fixed to the plate at two points.
  • the symmetrically arranged rods 11 of the fork are arranged to be displaced by a distance s as a result of the rotation ⁇ of the backrest 3.
  • the tensile load transmitting element 14 is here attached to the plate 10 at two points D and E.
  • the load F 2 will be distributed substantially symmetrically over both rods 11 of the fork such that that the power of each rod is essentially F 2 / 2.
  • the force in the tensile load transmitting element 14 is then essentially F 2 / 4.
  • the tensile load transmitting element 14 will then stretch, whereby the strain energy, which can have both an elastic and a plastic component, is collected by the tensile load transmitting element 14. Strain energy will be collected by the tensile load transmitting element at a maximum distance of 4s, depending on the elasticity modulus , dimensions and yield stress limit, a s , of the element.
  • Example 2 relates to a tensile load transmitting element combined with a solid extensible material as the energy absorbing elements and is illustrated in Figure 9.
  • Figure 9 shows an energy transferring device 4 according to an embodiment described above in Example 1, but with the difference that the energy absorbing element comprises both the tensile load bearing element itself and a solid elastomeric material coupled to the tensile load transmitting element at one end and is fixed to the plate at the other end.
  • the solid material may have variable cross sectional area along its longitudinal direction in order to achieve a preferred mechanical resistance from a biomechanical point of view.
  • the symmetrically arranged rods 11 or the fork are arranged to be displaced a distance s as a result of rotation by ⁇ of the backrest rotation.
  • the tensile load transmitting element 14 is fixed to the plate in point D as well as to a solid elastomeric material 15 at point E.
  • the solid elastomeric material 15 is, in turn, attached to the plate 4 at point F.
  • the load F 2 will be distributed symmetrically on the two rods of the fork such that the power of each rod is essentially F 2 / 2.
  • the force acting on the tensile load transmitting element 14 and the solid elastomeric material 15 is then essentially F 2 / 4.
  • Both the tensile load transmitting element 14 and the solid elastomeric material 15 will then extend under the influence of the pulling force F 2 / 4. It follows that the strain energy is collected by the element 14 and the solid elastomeric material element 15 during a displacement which at its maximum is 4s, depending on the elasticity modulus , dimensions and yield stress limit, ⁇ 8 , of the element 14 and the solid elastomeric material element 15, respectively.
  • Example 3 relates to a tensile load bearing element combined with a spring element as the energy absorbing element and is illustrated in Figure
  • Figure 10 shows an energy transmitting device according to an
  • the energy absorbing element comprises the tensile load transmitting element itself and a spring, where the spring is coupled to the tensile load transmitting device at one end and to the plate at the other.
  • the symmetrically arranged rods 11 or the fork are arranged to be displaced a distance s as a result of rotation by ⁇ of the backrest rotation.
  • the tensile load transmitting element 14 is fixed to the plate in point D as well as to a spring element 16 at point E.
  • the force F 2 will be distributed substantially symmetrically on the two rods 11 or the fork such that the power of each rod is essentially F 2 / 2.
  • the force acting in the element 14 and the spring element 16 then becomes essentially F 2 / 4.
  • the spring may have a progressive stiffness.
  • the tensile load transmitting element 14 and the spring 16 will then be extend whereby mechanical energy is absorbed in the tensile load transmitting element 14 and the spring 16, respectively, at a maximum distance of 4s, depending on the elasticity modulus , dimensions and yield stress limit of the band as well as the stiffness of the spring.
  • Example 6 relates to a tensile load transmitting element combined with a flywheel as an energy absorbing element.
  • Figure 7 shows a energy
  • the energy transmitting device comprises a shift comprising a number of rotatable members and a tensile load transmitting element, such as a belt, running around the discs in order to shift up the displacement of the fork
  • the energy absorbing element in the form of a flywheel 23 (not visible in Figure 7 but indicated in Figure 6), is positioned in the gap between the plates.
  • the tensile load transmitting element is in this case coupled to a disc whose axis of rotation is connected to a freewheel and a flywheel.
  • the symmetrically arranged rods 11 or the fork are arranged to be displaced a distance s as a result of rotation of the backrest rotation.
  • the element 14 is fixed to the plate in point D as well as to a disc 19 pivotably arranged in the plate at point E.
  • the force F a will be distributed substantially symmetrically on the two rods 11 or the fork such that the power of each rod is essentially F 2 / 2.
  • the force acting in the element 14 then becomes essentially F a / 4.
  • the energy transmission device 4 is complemented with a further plate, a bottom plate 21, which is secured to the plate 10 by a number of spacers 22 such that a gap between the two plates is formed.
  • a freewheel 20 coupled to a flywheel 23 is disposed in the gap between the two plates.
  • the axis G is thus rotatably connected to the flywheel 23.
  • the force of the element 14 will thus create a torque acting on the flywheel 23 during the maximum distance 4s.
  • the flywheel will thus be accelerated and collect kinetic energy.
  • the disc may have a rotational non- symmetric design to achieve a favorable energy transfer from the
  • the energy transmitting device 4 may have to be disengaged from the backrest when the seat is adjusted for reasons of comfort.
  • a locking mechanism can be arranged in the connection between the yoke 7 and the fork 8. This locking mechanism is thus arranged to release the backrest from the energy transferring device when the chair is adjusted for reasons of comfort.
  • the permitted rotational movement ⁇ may, as mentioned above, also need to be limited such that, for example, the rear passengers will not be injured.
  • One way to achieve this is to adapt the length of the tracks 9 in the plate 10 and a shock absorbing function may be provided in the end position.
  • the allowable rotation could be allowed to be greater in the absence of passengers in the back seat, which could be determined by sensors.
  • the tracks 9 are arranged with some type of mechanical barrier that stops the movement at different angular displacements depending on whether there are passengers in the back seat or not.
  • the chair may comprise a latch mechanism releasing the backrest for rotation according to a given condition, e.g. that the power of any structural component exceeds a certain value. For that reason, the chair may comprise any type of actuator, which, at a given signal from a sensor, disengages the backrest 3 for rotation, wherein the energy transmission function 4 is activated.
  • the invention has as its starting point taking a car chair and has been focused primarily on collisions from behind. It will be appreciated by the skilled person that the present invention also may be used for a collision from the front where e.g. an expanding airbag presses the driver against the backrest.
  • the present invention is also applicable to other types of chairs in order to transfer kinetic energy from the chair occupant.
  • An obvious example is child seats intended to be installed in cars.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Abstract

La présente invention a trait à un siège à absorption d'énergie qui a pour objet de réduire le risque de blessure, en particulier dans les cas d'accidents où le torse de l'occupant du siège est pressé contre le dossier. Pour ce faire, la présente invention permet une rotation limitée du dossier, ce qui permet de transformer le mouvement de rotation en un mouvement rectiligne, ce qui, avec une force associée dans la direction de mouvement, définit l'énergie qui peut être transférée à un élément d'absorption d'énergie. Grâce au fait que l'énergie est de la sorte transférée à partir de l'occupant du siège, les accélérations et les forces s'exerçant sur la tête et la colonne cervicale de l'occupant du siège sont réduites, ce qui permet de la sorte de réduire le risque de blessure.
EP13750748.9A 2012-07-11 2013-07-09 Siège à absorption d'énergie Withdrawn EP2872360A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1250813A SE536954C2 (sv) 2012-07-11 2012-07-11 Energiupptagande stol
PCT/SE2013/050882 WO2014011109A2 (fr) 2012-07-11 2013-07-09 Siège à absorption d'énergie

Publications (1)

Publication Number Publication Date
EP2872360A2 true EP2872360A2 (fr) 2015-05-20

Family

ID=49916629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13750748.9A Withdrawn EP2872360A2 (fr) 2012-07-11 2013-07-09 Siège à absorption d'énergie

Country Status (3)

Country Link
EP (1) EP2872360A2 (fr)
SE (1) SE536954C2 (fr)
WO (1) WO2014011109A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017009018A3 (fr) * 2015-07-10 2017-02-16 Safeseat Ip Ab Absorbeur d'énergie

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015107134A2 (fr) * 2014-01-16 2015-07-23 Safeseat Ip Ab Absorbeur d'énergie
CN110789555A (zh) * 2017-11-06 2020-02-14 北京交通大学 具有吊锤解锁机构的安全座椅

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2156938A5 (fr) * 1971-10-11 1973-06-01 Peugeot & Renault
JP2000280805A (ja) * 1999-01-29 2000-10-10 Genya Miyagishima 車両用の衝撃吸収シート

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2014011109A2 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017009018A3 (fr) * 2015-07-10 2017-02-16 Safeseat Ip Ab Absorbeur d'énergie

Also Published As

Publication number Publication date
SE1250813A1 (sv) 2014-01-12
WO2014011109A3 (fr) 2014-05-15
SE536954C2 (sv) 2014-11-11
WO2014011109A2 (fr) 2014-01-16

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