WO2009054788A1 - Scissor-arm suspension for vehicle seat allowing sidewise movement of the seat - Google Patents

Scissor-arm suspension for vehicle seat allowing sidewise movement of the seat Download PDF

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Publication number
WO2009054788A1
WO2009054788A1 PCT/SE2008/051191 SE2008051191W WO2009054788A1 WO 2009054788 A1 WO2009054788 A1 WO 2009054788A1 SE 2008051191 W SE2008051191 W SE 2008051191W WO 2009054788 A1 WO2009054788 A1 WO 2009054788A1
Authority
WO
WIPO (PCT)
Prior art keywords
seat
subframe
torsion link
link mechanisms
torsion
Prior art date
Application number
PCT/SE2008/051191
Other languages
French (fr)
Inventor
Krister Lindquist
Rickard Magnusson
Anna Kjernsvik
Olov Karlsson
Kenneth Söder
Johan KNÄLMANN
Original Assignee
Scania Cv (Publ)
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 Scania Cv (Publ) filed Critical Scania Cv (Publ)
Publication of WO2009054788A1 publication Critical patent/WO2009054788A1/en

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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1605—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the cinematic
    • B60N2/161—Rods
    • B60N2/1615—Parallelogram-like structure
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/06—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable
    • B60N2/062—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable transversally slidable
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/168—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable and provided with braking systems
    • 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
    • B60N2/38—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles specially constructed for use on tractors or like off-road vehicles
    • B60N2/39—Seats tiltable to compensate for roll inclination of vehicles
    • 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
    • B60N2/50—Seat suspension devices
    • 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
    • B60N2/50—Seat suspension devices
    • B60N2/506—Seat guided by rods
    • 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
    • B60N2/50—Seat suspension devices
    • B60N2/506—Seat guided by rods
    • B60N2/507—Parallelogram-like structure
    • 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
    • B60N2/50—Seat suspension devices
    • B60N2/506—Seat guided by rods
    • B60N2/508—Scissors-like structure
    • 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
    • B60N2/50—Seat suspension devices
    • B60N2/54—Seat suspension devices using mechanical springs
    • B60N2/548—Torsion springs, e.g. torsion helicoidal springs
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2002/0204—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable characterised by the seat or seat part turning about or moving along a non-standard, particular axis, i.e. an axis different from the axis characterising the conventional movement
    • B60N2002/0212—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable characterised by the seat or seat part turning about or moving along a non-standard, particular axis, i.e. an axis different from the axis characterising the conventional movement the seat or seat part turning about or moving along a longitudinal axis

Definitions

  • Scissor-arm suspension for vehicle seat allowing sidewise movement of the seat
  • the invention relates to a seat subframe comprising a pair of torsion link mechanisms arranged at mutual lateral spacing which have upper and lower ends supported for pivoting about transverse axes to allow vertical movement of the subframe.
  • Such a seat subframe known from, for example, US 5950977 A is often used for a truck in combination with a seat suspension/damper for damping vertical vibrations from the vehicle to a person sitting in a seat mounted on the subframe.
  • a seat subframe cannot damp vibrations sideways, e.g. in the rolling direction of the vehicle or the vehicle cab.
  • An object of the invention is therefore to further develop a seat subframe of the kind indicated in the introduction so that it can also damp sideways vibrations.
  • the upper and lower ends of the torsion link mechanisms are also arranged for pivoting about longitudinal axes to allow lateral movement of the subframe.
  • the known torsion link configuration can thus by simple means be enabled to move sideways independently of its vertical movements.
  • vibration damper acting vertically it is possible to arrange a separate vibration damper for limiting the sideways movements.
  • the vibration damper may comprise a damper acting diagonally upon the subframe between an upper longitudinal axis and a lower longitudinal axis. A single damper may then be sufficient to damp movements both vertically and sideways. However, the vibration damper may also comprise a further damper acting diagonally between a second lower longitudinal axis and a second upper longitudinal axis. The two dampers may then cross one another to distribute the damping forces uniformly to the subframe.
  • a torsion link arm of one of the torsion link mechanisms and a corresponding torsion link arm of the other torsion link mechanism may be joined together by a torsion spring at one of their ends.
  • the torsion spring may thus serve as an anti-roll stabiliser for the subframe.
  • the torsion spring may then be configured to allow springing movements and/or to damp also sideways vibrations of the subframe.
  • the lower ends of the torsion link mechanisms may be arranged at greater mutual lateral spacing than their upper ends.
  • a seat on the subframe can then allow springing movements and/or damp vibrations by pivoting like a pendulum about a virtual longitudinal pivot axis above the seat.
  • the lateral spacing may then be chosen, for example, so that the pivot axis is situated approximately at eye height of a person sitting on the seat.
  • the seat may instead pivot like an inverted pendulum about a virtual longitudinal pivot axis below the seat.
  • FIG. 1 is a schematic view obliquely from below of a vehicle seat with a seat subframe according to the invention
  • FIG. 2 is a front view with cutaway portions of the seat in FIG. 1 fitted to a vehicle floor;
  • FIG. 3 is a view obliquely from above, with cutaway portions, of a vehicle seat with a pair of vibration dampers which cross diagonally;
  • FIG. 4 is a view obliquely from above of a seat subframe with a vibration damper in the form of an anti-roll stabiliser; and FIG. 5 is a view from the rear, with cutaway portions, of a vehicle seat with torsion links mutually diverging upwards; and FIG. 6 is a view from the rear, with cutaway portions, of a vehicle seat with torsion links mutually diverging downwards.
  • Each sub frame 10 may be regarded as being of torsion link type and comprises in more detail a pair of torsion link mechanisms 20 arranged at mutual spacing.
  • Each torsion link mechanism itself comprises a pair of torsion link arms 22 connected for articulation at their midpoints.
  • upper and lower ends of each pair of torsion link arms 22 in the torsion link mechanisms are, in a known manner not described in more detail, connected via sliding articulations 24 articulatedly - about axes 26 (FIG. 1) - and in a linear manner to their respective longitudinal guides 30 which extend in a longitudinal direction of the subframe 10.
  • the longitudinal guides 30 are depicted in the embodiment examples in the form of sliderails or sliderods of circular cross-section but may also have other shapes; they may for example take the form of undepicted longitudinal grooves for the sliding articulations.
  • the upper pair of longitudinal guides 30 are connected in a manner not depicted in more detail to a sitting portion 14 of a vehicle seat 12 which also has a backrest 16. Between the subframe 10 and the seat 12 there may also be other undepicted types of mechanisms which make it possible, for example, to set the angles of the sitting portion 14 and the backrest 16.
  • the lower pair of longitudinal guides 30 are intended to be connected to a vehicle floor 18 (FIG. 2). If the subframe 10 does not need to be able to perform movements in a longitudinal direction, i.e. if the seat 12 does not need to be movable longitudinally along the vehicle floor, it should be noted that each articulation need not be a sliding articulation 24 but the four rear articulations 24' may instead be, for example, simply pivot articulations firmly arranged relative to the longitudinal guides
  • the sub frame 10 further has a vibration damper 40 which in the embodiment example in FIGS. 1 and 2 acts between the subframe 10 and the vehicle floor 18.
  • the vibration damper 40 may both here and in other embodiments be, in a manner not depicted in more detail, a spring or a spring and damper combination. It should be noted that the subframe 10 thus far described can in a conventional manner perform movements vertically for height setting of the seat or for damping of vertical vibrations which act between the vehicle floor 18 and the seat 12.
  • the articulations 24 and 24' are also supported for pivoting about longitudinal axes relative to the longitudinal guides 30, in the embodiment examples the axes 28 of the sliderails 30 (FIG. 4).
  • the subframe 10 is then also allowed to perform pivoting movements sideways. These sideways pivoting movements may be damped by a further schematically depicted vibration damper 40 acting, for example, between a cab structure 19 and the seat 12.
  • a vibration damper 40 acting, for example, between a cab structure 19 and the seat 12.
  • one or more linear dampers 40 may in an undepicted manner extend vertically between a pair of longitudinal guides, the embodiment according to FIG. 3 illustrates the possibility of having linear vibration dampers 40 acting diagonally between the longitudinal guides 30.
  • dampers 40 need not be connected to the longitudinal guides 30 but may instead extend between the articulations 24 and/or 24' (not depicted).
  • the damper 40 is integrated with a pair of torsion link arms 22.
  • the damper 40 may in this case be a single part in the form of a substantially U-shaped anti-roll stabiliser with a bottom element in the form of a torsion spring 42.
  • This damper 40 may also act sideways by inherent flexural elasticity of the torsion link arms 22.
  • This subframe 10 may also have in a manner not depicted one or more vertical or diagonal supplementary dampers 40 according to the embodiment described in relation to FIG. 3.
  • the torsion link mechanisms 20 are angled convergingly upwards. This means that in response to lateral vibrations the seat 12 mounted on the subframe 10 will perform an oscillating movement about a virtual longitudinal axis situated below the seat 12. If in a converse case according to the embodiment depicted in FIG. 6 the torsion link mechanisms 20 are angled convergingly downwards, the seat 12 will instead respond to lateral vibrations by performing an oscillating movement about a virtual longitudinal axis situated above the seat 12.
  • the type and degree of convergence of the torsion link mechanisms may be set as desired via a setting device 50 such as a screw mechanism.
  • a link 52 may be arranged between the lower longitudinal guides 30 to synchronise the movements of the torsion link mechanisms 20.
  • FIGS. 5 and 6 may also be applied to all the embodiments of the invention described above.
  • the description set out above is primarily intended to facilitate comprehension and no unnecessary limitations of the invention are to be inferred therefrom.
  • the articulations 24 (or 24') need not be sliding articulations to allow movement of the transverse axes 26 but may in an undepicted manner be replaced by immovable pivot articulations connected to the ends of the torsion link mechanisms via extra link arms which allow this movement.
  • Other modifications which will be obvious to one skilled in the art from perusing the description may be implemented without departing from the concept of the invention or the scope of the claims set out below.

Abstract

A seat subframe (10) comprising a pair of torsion link mechanisms (20) arranged at mutual lateral spacing which have upper and lower ends supported for pivoting about transverse axes (26) to allow vertical movement of the subframe (10). According to the invention the upper and lower ends of the torsion link mechanisms (20) are also supported for pivoting about longitudinal axes to allow lateral movement of the subframe (10).

Description

Scissor-arm suspension for vehicle seat allowing sidewise movement of the seat
TECHNICAL FIELD
The invention relates to a seat subframe comprising a pair of torsion link mechanisms arranged at mutual lateral spacing which have upper and lower ends supported for pivoting about transverse axes to allow vertical movement of the subframe.
BACKGROUND Such a seat subframe known from, for example, US 5950977 A is often used for a truck in combination with a seat suspension/damper for damping vertical vibrations from the vehicle to a person sitting in a seat mounted on the subframe. However, such a seat subframe cannot damp vibrations sideways, e.g. in the rolling direction of the vehicle or the vehicle cab.
SUMMARY OF THE INVENTION
An object of the invention is therefore to further develop a seat subframe of the kind indicated in the introduction so that it can also damp sideways vibrations.
According to a version of the invention, the upper and lower ends of the torsion link mechanisms are also arranged for pivoting about longitudinal axes to allow lateral movement of the subframe.
The known torsion link configuration can thus by simple means be enabled to move sideways independently of its vertical movements.
As well as known types of vibration damper acting vertically, it is possible to arrange a separate vibration damper for limiting the sideways movements.
According to an embodiment, the vibration damper may comprise a damper acting diagonally upon the subframe between an upper longitudinal axis and a lower longitudinal axis. A single damper may then be sufficient to damp movements both vertically and sideways. However, the vibration damper may also comprise a further damper acting diagonally between a second lower longitudinal axis and a second upper longitudinal axis. The two dampers may then cross one another to distribute the damping forces uniformly to the subframe.
According to another embodiment, a torsion link arm of one of the torsion link mechanisms and a corresponding torsion link arm of the other torsion link mechanism may be joined together by a torsion spring at one of their ends. The torsion spring may thus serve as an anti-roll stabiliser for the subframe. The torsion spring may then be configured to allow springing movements and/or to damp also sideways vibrations of the subframe.
According to a further embodiment, the lower ends of the torsion link mechanisms may be arranged at greater mutual lateral spacing than their upper ends. A seat on the subframe can then allow springing movements and/or damp vibrations by pivoting like a pendulum about a virtual longitudinal pivot axis above the seat. The lateral spacing may then be chosen, for example, so that the pivot axis is situated approximately at eye height of a person sitting on the seat. If, conversely, the upper ends of the torsion link mechanisms are arranged at greater mutual lateral spacing than their lower ends, the seat may instead pivot like an inverted pendulum about a virtual longitudinal pivot axis below the seat.
Other features and advantages of the invention may be indicated by the claims and the following description of embodiment examples.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view obliquely from below of a vehicle seat with a seat subframe according to the invention;
FIG. 2 is a front view with cutaway portions of the seat in FIG. 1 fitted to a vehicle floor;
FIG. 3 is a view obliquely from above, with cutaway portions, of a vehicle seat with a pair of vibration dampers which cross diagonally;
FIG. 4 is a view obliquely from above of a seat subframe with a vibration damper in the form of an anti-roll stabiliser; and FIG. 5 is a view from the rear, with cutaway portions, of a vehicle seat with torsion links mutually diverging upwards; and FIG. 6 is a view from the rear, with cutaway portions, of a vehicle seat with torsion links mutually diverging downwards.
Items with similar functions in the various drawings bear the same reference numbers throughout.
DETAILED DESCRIPTION OF EMBODIMENT EXAMPLES The drawings depict schematically illustrated embodiments of seat subframes 10 according to the invention.
Each sub frame 10 may be regarded as being of torsion link type and comprises in more detail a pair of torsion link mechanisms 20 arranged at mutual spacing. Each torsion link mechanism itself comprises a pair of torsion link arms 22 connected for articulation at their midpoints. Although other configurations are possible, upper and lower ends of each pair of torsion link arms 22 in the torsion link mechanisms are, in a known manner not described in more detail, connected via sliding articulations 24 articulatedly - about axes 26 (FIG. 1) - and in a linear manner to their respective longitudinal guides 30 which extend in a longitudinal direction of the subframe 10. The longitudinal guides 30 are depicted in the embodiment examples in the form of sliderails or sliderods of circular cross-section but may also have other shapes; they may for example take the form of undepicted longitudinal grooves for the sliding articulations.
The upper pair of longitudinal guides 30 are connected in a manner not depicted in more detail to a sitting portion 14 of a vehicle seat 12 which also has a backrest 16. Between the subframe 10 and the seat 12 there may also be other undepicted types of mechanisms which make it possible, for example, to set the angles of the sitting portion 14 and the backrest 16.
The lower pair of longitudinal guides 30 are intended to be connected to a vehicle floor 18 (FIG. 2). If the subframe 10 does not need to be able to perform movements in a longitudinal direction, i.e. if the seat 12 does not need to be movable longitudinally along the vehicle floor, it should be noted that each articulation need not be a sliding articulation 24 but the four rear articulations 24' may instead be, for example, simply pivot articulations firmly arranged relative to the longitudinal guides The sub frame 10 further has a vibration damper 40 which in the embodiment example in FIGS. 1 and 2 acts between the subframe 10 and the vehicle floor 18. The vibration damper 40 may both here and in other embodiments be, in a manner not depicted in more detail, a spring or a spring and damper combination. It should be noted that the subframe 10 thus far described can in a conventional manner perform movements vertically for height setting of the seat or for damping of vertical vibrations which act between the vehicle floor 18 and the seat 12.
According to the invention, the articulations 24 and 24' are also supported for pivoting about longitudinal axes relative to the longitudinal guides 30, in the embodiment examples the axes 28 of the sliderails 30 (FIG. 4). As particularly illustrated in FIG. 2, the subframe 10 is then also allowed to perform pivoting movements sideways. These sideways pivoting movements may be damped by a further schematically depicted vibration damper 40 acting, for example, between a cab structure 19 and the seat 12. Although one or more linear dampers 40 may in an undepicted manner extend vertically between a pair of longitudinal guides, the embodiment according to FIG. 3 illustrates the possibility of having linear vibration dampers 40 acting diagonally between the longitudinal guides 30. Even if a single diagonal vibration damper 40 may be sufficient for damping vibrations in both vertical and lateral (rolling) directions, two diagonally crossing dampers 40 provide a more uniform damping action upon the subframe 10. The dampers 40 need not be connected to the longitudinal guides 30 but may instead extend between the articulations 24 and/or 24' (not depicted).
In the embodiment of the subframe 10 depicted in FIG. 4, the damper 40 is integrated with a pair of torsion link arms 22. The damper 40 may in this case be a single part in the form of a substantially U-shaped anti-roll stabiliser with a bottom element in the form of a torsion spring 42. This damper 40 may also act sideways by inherent flexural elasticity of the torsion link arms 22. This subframe 10 may also have in a manner not depicted one or more vertical or diagonal supplementary dampers 40 according to the embodiment described in relation to FIG. 3.
In the embodiment of the subframe 10 depicted in FIG. 5, the torsion link mechanisms 20 are angled convergingly upwards. This means that in response to lateral vibrations the seat 12 mounted on the subframe 10 will perform an oscillating movement about a virtual longitudinal axis situated below the seat 12. If in a converse case according to the embodiment depicted in FIG. 6 the torsion link mechanisms 20 are angled convergingly downwards, the seat 12 will instead respond to lateral vibrations by performing an oscillating movement about a virtual longitudinal axis situated above the seat 12. As schematically illustrated in FIG. 5, the type and degree of convergence of the torsion link mechanisms may be set as desired via a setting device 50 such as a screw mechanism. In addition, a link 52 may be arranged between the lower longitudinal guides 30 to synchronise the movements of the torsion link mechanisms 20. The embodiments according to FIGS. 5 and 6 may also be applied to all the embodiments of the invention described above.
The description set out above is primarily intended to facilitate comprehension and no unnecessary limitations of the invention are to be inferred therefrom. For example, the articulations 24 (or 24') need not be sliding articulations to allow movement of the transverse axes 26 but may in an undepicted manner be replaced by immovable pivot articulations connected to the ends of the torsion link mechanisms via extra link arms which allow this movement. Other modifications which will be obvious to one skilled in the art from perusing the description may be implemented without departing from the concept of the invention or the scope of the claims set out below.

Claims

1. A seat sub frame ( 10) comprising a pair of torsion link mechanisms (20) arranged at mutual lateral spacing which have upper and lower ends supported for pivoting about transverse axes (26) to allow vertical movement of the subframe (10), characterised in that the upper and lower ends of the torsion link mechanisms (20) are also supported for pivoting about longitudinal axes (28) to allow lateral movement of the subframe (10).
2. A seat subframe according to claim 1, comprising a vibration damper (40) for limiting said lateral movement.
3. A seat subframe according to claim 2, in which the vibration damper comprises a damper (40) acting diagonally upon the subframe (10) between a lower and an upper longitudinal axis (30).
4. A seat subframe according to claim 3, in which the vibration damper (40) comprises a further damper (40) acting diagonally between a second lower and a second upper longitudinal axis (30).
5. A seat subframe according to any of the foregoing claims, in which a torsion link arm (22) of one of the torsion link mechanisms (20) and a corresponding torsion link arm (22) of the other of the torsion link mechanisms (20) are joined together by a torsion spring (20) at a pair of their ends.
6. A seat subframe according to any of the foregoing claims, in which the lower ends of the torsion link mechanisms (20) are arranged at greater mutual lateral spacing than their upper ends.
7. A seat subframe according to any of the claims 1-5, in which the upper ends of the torsion link mechanisms (20) are arranged at greater mutual lateral spacing than their lower ends.
8. A seat sub frame according to either of claims 6 and 7, comprising a setting device (50) for setting the lateral spacing.
PCT/SE2008/051191 2007-10-26 2008-10-23 Scissor-arm suspension for vehicle seat allowing sidewise movement of the seat WO2009054788A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0702384-9 2007-10-26
SE0702384A SE531594C2 (en) 2007-10-26 2007-10-26 chair base

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PCT/SE2008/051191 WO2009054788A1 (en) 2007-10-26 2008-10-23 Scissor-arm suspension for vehicle seat allowing sidewise movement of the seat

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SE (1) SE531594C2 (en)
WO (1) WO2009054788A1 (en)

Cited By (13)

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GB2465877A (en) * 2008-12-02 2010-06-09 Gm Global Tech Operations Inc Transversely adjustable motor vehicle seat
CN105138784A (en) * 2015-09-06 2015-12-09 山东理工大学 Analytic calculation method for optimal damping ratio of seat suspension of high-speed rail vehicle
CN105183983A (en) * 2015-09-06 2015-12-23 山东理工大学 Optimal design method for optimal damping ratio of high-speed railway vehicle seat suspension
EP3181396A1 (en) * 2015-12-14 2017-06-21 Grammer Ag Vehicle vibration device
EP3181397A1 (en) * 2015-12-14 2017-06-21 Grammer Ag Vehicle vibration device
US10046677B2 (en) 2013-04-23 2018-08-14 Clearmotion Acquisition I Llc Seat system for a vehicle
CN111002884A (en) * 2018-10-04 2020-04-14 格拉默公司 Vehicle seat
CN111605447A (en) * 2019-02-26 2020-09-01 丰田自动车株式会社 Vehicle seat
EP3835123A1 (en) * 2019-12-13 2021-06-16 Grammer Ag Vehicle seat with a spring unit for providing suspension for rolling and vertical spring movement
EP3835116A1 (en) * 2019-12-13 2021-06-16 Grammer Ag Vehicle seat with frame arrangement
EP3835117A1 (en) * 2019-12-13 2021-06-16 Grammer Ag Vehicle seat with frame arrangement
EP3835121A1 (en) * 2019-12-13 2021-06-16 Grammer Ag Vehicle seat with a spring unit for suspending roll and vertical movement
CN112977210A (en) * 2019-12-13 2021-06-18 格拉默公司 Vehicle seat with suspension unit for damping rolling and vertical suspension movements

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