CA2189367A1 - A spring system for resilient suspension of objects, such as vehicle seats - Google Patents
A spring system for resilient suspension of objects, such as vehicle seatsInfo
- Publication number
- CA2189367A1 CA2189367A1 CA 2189367 CA2189367A CA2189367A1 CA 2189367 A1 CA2189367 A1 CA 2189367A1 CA 2189367 CA2189367 CA 2189367 CA 2189367 A CA2189367 A CA 2189367A CA 2189367 A1 CA2189367 A1 CA 2189367A1
- Authority
- CA
- Canada
- Prior art keywords
- guide means
- spring
- centre
- base
- supported
- 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.)
- Abandoned
Links
- 239000000725 suspension Substances 0.000 title claims abstract description 6
- 230000033001 locomotion Effects 0.000 claims abstract description 7
- 230000004308 accommodation Effects 0.000 claims abstract 2
- 230000000750 progressive effect Effects 0.000 abstract 1
- 230000003137 locomotive effect Effects 0.000 description 5
- 238000013016 damping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 208000019462 Occupational injury Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
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
- B60N2/50—Seat suspension devices
- B60N2/502—Seat suspension devices attached to the base of the 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
- B60N2/50—Seat suspension devices
- B60N2/509—Seat guided by slides or the like
-
- 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
- B60N2/52—Seat suspension devices using fluid means
- B60N2/525—Seat suspension devices using fluid means using gas
-
- 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
- B60N2/52—Seat suspension devices using fluid means
- B60N2/527—Seat suspension devices using fluid means using liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D33/00—Seats
- B61D33/0057—Seats characterised by their mounting in vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention refers to a spring system for resilient suspension of objects subjected to great disturbing forces with low frequencies, such as vehicle seats and particularly driver's seats in railway vehicles, and for accommodation of movements with at least three degrees of freedom between object and base, the object (1) by means of two sets of guide means (2, 4) arranged vertically above each other being mounted freely movable substantially horizontally in two directions (x, y) at right angles to each other. In order to provide for a more compact and less complicated spring arrangement as well as in order to obtain a desirable progressive spring action, the invention suggests that the object (1) is permanently subjected to the force of a tension spring means (8), which at one of its ends is secured to the centre (7) of the horizontal underside of the object (1), supported by the upper set of guide means (2), and at its other end (9) is secured to the centre of the lower set of guide means (4), supported by the base, possibly at a downwards offset position.
Description
W0 95/30~58 r~
~ 1 A sprin~ system for resi I ient suspension of objects, such as vehicle seats.
The present invention refers to a spring system for resilient sllcp~nc;~n of objects subjected to great disturbing forces with low rL~ ,cic~c, such as vehicle seats and parti-10 cularly driver's seats in railway vehicles, and for a a~_tion of ~ ~ Ls with at least three degrees of freedom bet-ween object and base, the object by means of two sets of guide means ~L~ g~d vertically above each other being moun-ted freely movable substantially horisontally in two direc-tions at right angles to each other.
A spring system of this type is known from EP O 054 880 as well as from the Swedish patent specification 66594 from the year 1926. In both cases, pairs of tension springs are used for controlling the ,v~ ~ in two directions at 20 right angles to each other. The plurality of spring means makes this structure rather - 1 i c ated.
Spring systems of the most various kinds have been suggested during the years in order to solve different spring suspension problems, particularly in connection with vehic-25 les. Most often said spring systems have been focused onsolving the spring problems in connection with vibratory motions of higher frequencies while the low frequencies close to 1 Hz have been paid little attention to.
In the last years the health hazards in connection 30 with the practising of various professions have been more observed and the attention has been more and more focused on such low-frequency vibrations which occur in certain types of ve~icles and which imply great loads on the human body which might lead to occupational injuries. One such occupational 35 category is for instance locomotive drivers, particularly drivers of heavy freight trains where - , ~ Ls in y-direc-tion (i.e. transversely to the direction of travel) might imply throw ~, Ls of a magnitude of up to 60 mm at rail-
~ 1 A sprin~ system for resi I ient suspension of objects, such as vehicle seats.
The present invention refers to a spring system for resilient sllcp~nc;~n of objects subjected to great disturbing forces with low rL~ ,cic~c, such as vehicle seats and parti-10 cularly driver's seats in railway vehicles, and for a a~_tion of ~ ~ Ls with at least three degrees of freedom bet-ween object and base, the object by means of two sets of guide means ~L~ g~d vertically above each other being moun-ted freely movable substantially horisontally in two direc-tions at right angles to each other.
A spring system of this type is known from EP O 054 880 as well as from the Swedish patent specification 66594 from the year 1926. In both cases, pairs of tension springs are used for controlling the ,v~ ~ in two directions at 20 right angles to each other. The plurality of spring means makes this structure rather - 1 i c ated.
Spring systems of the most various kinds have been suggested during the years in order to solve different spring suspension problems, particularly in connection with vehic-25 les. Most often said spring systems have been focused onsolving the spring problems in connection with vibratory motions of higher frequencies while the low frequencies close to 1 Hz have been paid little attention to.
In the last years the health hazards in connection 30 with the practising of various professions have been more observed and the attention has been more and more focused on such low-frequency vibrations which occur in certain types of ve~icles and which imply great loads on the human body which might lead to occupational injuries. One such occupational 35 category is for instance locomotive drivers, particularly drivers of heavy freight trains where - , ~ Ls in y-direc-tion (i.e. transversely to the direction of travel) might imply throw ~, Ls of a magnitude of up to 60 mm at rail-
2~ 893~7 way failures. The ~ 'Ation of such v - requires spring suspensions with long stroke and in the last years sugge6tions have been made in order to improve the travel comfort to locomotive drivers without, however, any deci6ive success having been achieved.
The object of the present invention is to suggest a device in spring systems of the afuL. ~ioned kind which has turned out to be a very good solution to the problems present. The invention is 6ubstantially distinguished in that the object is pPrr-nPntly subjected to the force of a tension spring means, which at one of its ends is secured to the centre of the horisontal underside of the object, supported by the upper set of guide means, and at its other end is secured to the centre of the lower set of guide means, sup-ported by the base, possibly at a downwards off-set position.
The present invention now allows the provision of a really comfortable travel to the person sitting in the seat, which has been conf irmed by theoretical as well as practical tests .
By way of example the invention will be further des-cribed below with reference to the Ar -nying drawing, in which Fig. 1 is a perspective view of the inventive spring system, Fig. 2 i8 a side elevational view of the same system, Fig. 3 is a further side elevational view of the system at right angles to the view of Fig. 2 and Fig. 4 is a diagram illustrating the advantageous effects of the inventive system with respect to the total comfort ilL~lU~ l and the impact damping action in x, y and z direction.
In Figs. 1-3 of the drawing an inventive spring system is illustrated, which comprises a substantially hori-sontal mounting plate 1, adapted to support an object subjec-ted to disturbing forces such as a vehicle seat and particu-larly a driver's seat in a non-illustrated railway vehicle.
By means of a f irst set of guide means 2 the mounting plate is journalled freely movable in a first direction which has been indicated by arl arrow x on the drawing. Said guide means might be of any known type but are most advantageously made _ _ _ _ _ Wo 95/30558 PCT/SE94/00407 as so-called linear bearings with ball hll~h;ngc 2a. A bearing rod 2b run6 therein and the number of linear bearings in the set amounts to at least two.
The ball hll~h i n~: 2a in their turn are mounted on an 5 underlying and also substantially horisontal int~ - ~ i Ary plate 3, which in its turn by means of a second set of guide means 4 is jollrnAl led freely movable in a direction at right angles to the first-mentioned direction, such as indicated by the arrow y on the drawing. Preferably, al60 said second set 10 of guide means 4, which also are at least two in number, are of the same kind as the first set and hence consist of linear bearings with ball bu~hin~c 4a, which are slidably movable on bearing rods 4b. The arr~, L is such that the ball bushings 4a preferably are mounted at the lower side of the 15 int~ ' i Ate plate 3 and run on the parallell bearing rods 4b, which in their turn are mounted on a substantially hori-sontal base plate 5. This is supported from a floor 6 or a cuLL~ lin~ base in e.g. a locomotive.
According to the invention, from a position 7, prefe-20 rably at the centre of the lower side of the uppermost moun-ting plate 1 a ten6ion spring means 8 extends, which in the drawing only has been indicated by means of broken lines, to a position at the centre of the lower set of guide means 4, supported by the base 6, and particularly at a position 9 25 vertically downwardly off-set in relation to said guide means 4. The tension spring means 8 thus always tends to keep its two mounting ends 7 and 9 located on the same vertical axis.
Every disturbing active f orce in the x direction or y direc-tion which leads to a sliding r vl ~ of the mounting plate 30 1 and/or the int~ ';Ate plate 3 in x direction and y direc-tion, respectively or to a u ~ hin~l orbital motion, a so-cal-led yaw motion, in the horisontal plane will cause an exten-sion of the spring means 8 and hence the occurance of a cor-r~p~n~lin~ returning force. It is to be noted that the struc-35 tural arrangement according to the invention provides such ageometry of the motion of the tension spring 8 that the spring action will be pluyL~S~iVe in a very advantageous way.
WO 95/30558 PCT/S~94/00407 The tension spring 8 can be of any known type but is preferably a gas hydraulic spring of elongated cylindrical type such as often is used within the vehicle field. Sald gas-hydraulic spring may also be provided with a damping 5 action, preferably adjustable, as is well known.
As is evident from Fig. 3 the lower mounting end 9 of the tension spring 8 preferably is secured to a yoke 10 which extends ~ . ..r-lly from the lower side of the base plate 5, namely in order to assure a required spacing between the mounting ends 7 and 9 of the spring in view of the structure length of the tension spring 8, particularly when the same is a gas-hydraulic spring. The mounting end 9 lies on the verti-cal central axis of the base plate 5.
The ab~,v~ .,L~ted design allows that the mounting plate 1 and hence a driver's 6eat of e.g. a railway locomo-tive might be supported with a possibility for VG Ls with three degrees of freedom, thus x, y and yaw. In spite of the relatively restricted space in driver ' s ,_ i -ntS of loco-motives and the like the required long spring travel distan-ces of up to 80 mm might be provided owing to the spring system suggested according to the invention. This provides for the achievement of a substantially; _ ~Jved travel com-f ort to the person sitting in the driver ' s seat . This is evident from practical tests which have been carried out and which have been illustrated in Fig. 4 of the drawing. In said figure, Fig. 4a is a diagram of the relation between the number of oscillations in hertz and the accelerations in a prior driver's chair (dotted line) and the inventive subject matter (unbroken line). In Fig. 4b is illustrated the corre-5pnnfl;nq relation to disturbances in y direction which in this case implies oscillations in the transversal direction of the vehicle, while in Fig. 4c the same relation in x direction has been illustrated, thus in the longitudinal direction of the vehicle.
As also is evident from the drawing, the suggested structural '; ~ of the spring system for vehicle seats and the like according to the invention provides f or a simi-WO 95t30558 2 1 8 9 3 ~ 7 PCT/SE94/00407 lar springing action also in vertical or z direction. In this case, the base plate 5 is similarly journalled freely sli-dable in vertical direction by means of a third set of guide means 11. Said guide means consist of at least two parallell 5 vertical bearing rods llb, which with their upper ends are secured to the base plate and which are journalled in corre-sponding bearing b~lch;ngc lla which are rigidly secured to the floor or base 6 by means of a bed 12. Vertically through 6aid hollow bed 12 extends from a position 13 in the centre 10 of the bottom thereof a yLe_,uLa spring 14 which only has been indicated by a dotted line. At its upper end said pres-6ure spring 14 is secured at a position in vertical ~l;; L
with and preferably also horisontally cs;nr;-l;n~ with the mounting end 9 of the lower end of the tension spring 8.
Owing to said design a still further ; ~ ved springing action might be obtained which has been illustrated in Fig. 4d.
Furth. e, the yLe5~ULa 6pring 14 might be of any suitable known type but preferably said spring also is made0 as a gas-hydraulic spring, particularly provided with damping ction.
The object of the present invention is to suggest a device in spring systems of the afuL. ~ioned kind which has turned out to be a very good solution to the problems present. The invention is 6ubstantially distinguished in that the object is pPrr-nPntly subjected to the force of a tension spring means, which at one of its ends is secured to the centre of the horisontal underside of the object, supported by the upper set of guide means, and at its other end is secured to the centre of the lower set of guide means, sup-ported by the base, possibly at a downwards off-set position.
The present invention now allows the provision of a really comfortable travel to the person sitting in the seat, which has been conf irmed by theoretical as well as practical tests .
By way of example the invention will be further des-cribed below with reference to the Ar -nying drawing, in which Fig. 1 is a perspective view of the inventive spring system, Fig. 2 i8 a side elevational view of the same system, Fig. 3 is a further side elevational view of the system at right angles to the view of Fig. 2 and Fig. 4 is a diagram illustrating the advantageous effects of the inventive system with respect to the total comfort ilL~lU~ l and the impact damping action in x, y and z direction.
In Figs. 1-3 of the drawing an inventive spring system is illustrated, which comprises a substantially hori-sontal mounting plate 1, adapted to support an object subjec-ted to disturbing forces such as a vehicle seat and particu-larly a driver's seat in a non-illustrated railway vehicle.
By means of a f irst set of guide means 2 the mounting plate is journalled freely movable in a first direction which has been indicated by arl arrow x on the drawing. Said guide means might be of any known type but are most advantageously made _ _ _ _ _ Wo 95/30558 PCT/SE94/00407 as so-called linear bearings with ball hll~h;ngc 2a. A bearing rod 2b run6 therein and the number of linear bearings in the set amounts to at least two.
The ball hll~h i n~: 2a in their turn are mounted on an 5 underlying and also substantially horisontal int~ - ~ i Ary plate 3, which in its turn by means of a second set of guide means 4 is jollrnAl led freely movable in a direction at right angles to the first-mentioned direction, such as indicated by the arrow y on the drawing. Preferably, al60 said second set 10 of guide means 4, which also are at least two in number, are of the same kind as the first set and hence consist of linear bearings with ball bu~hin~c 4a, which are slidably movable on bearing rods 4b. The arr~, L is such that the ball bushings 4a preferably are mounted at the lower side of the 15 int~ ' i Ate plate 3 and run on the parallell bearing rods 4b, which in their turn are mounted on a substantially hori-sontal base plate 5. This is supported from a floor 6 or a cuLL~ lin~ base in e.g. a locomotive.
According to the invention, from a position 7, prefe-20 rably at the centre of the lower side of the uppermost moun-ting plate 1 a ten6ion spring means 8 extends, which in the drawing only has been indicated by means of broken lines, to a position at the centre of the lower set of guide means 4, supported by the base 6, and particularly at a position 9 25 vertically downwardly off-set in relation to said guide means 4. The tension spring means 8 thus always tends to keep its two mounting ends 7 and 9 located on the same vertical axis.
Every disturbing active f orce in the x direction or y direc-tion which leads to a sliding r vl ~ of the mounting plate 30 1 and/or the int~ ';Ate plate 3 in x direction and y direc-tion, respectively or to a u ~ hin~l orbital motion, a so-cal-led yaw motion, in the horisontal plane will cause an exten-sion of the spring means 8 and hence the occurance of a cor-r~p~n~lin~ returning force. It is to be noted that the struc-35 tural arrangement according to the invention provides such ageometry of the motion of the tension spring 8 that the spring action will be pluyL~S~iVe in a very advantageous way.
WO 95/30558 PCT/S~94/00407 The tension spring 8 can be of any known type but is preferably a gas hydraulic spring of elongated cylindrical type such as often is used within the vehicle field. Sald gas-hydraulic spring may also be provided with a damping 5 action, preferably adjustable, as is well known.
As is evident from Fig. 3 the lower mounting end 9 of the tension spring 8 preferably is secured to a yoke 10 which extends ~ . ..r-lly from the lower side of the base plate 5, namely in order to assure a required spacing between the mounting ends 7 and 9 of the spring in view of the structure length of the tension spring 8, particularly when the same is a gas-hydraulic spring. The mounting end 9 lies on the verti-cal central axis of the base plate 5.
The ab~,v~ .,L~ted design allows that the mounting plate 1 and hence a driver's 6eat of e.g. a railway locomo-tive might be supported with a possibility for VG Ls with three degrees of freedom, thus x, y and yaw. In spite of the relatively restricted space in driver ' s ,_ i -ntS of loco-motives and the like the required long spring travel distan-ces of up to 80 mm might be provided owing to the spring system suggested according to the invention. This provides for the achievement of a substantially; _ ~Jved travel com-f ort to the person sitting in the driver ' s seat . This is evident from practical tests which have been carried out and which have been illustrated in Fig. 4 of the drawing. In said figure, Fig. 4a is a diagram of the relation between the number of oscillations in hertz and the accelerations in a prior driver's chair (dotted line) and the inventive subject matter (unbroken line). In Fig. 4b is illustrated the corre-5pnnfl;nq relation to disturbances in y direction which in this case implies oscillations in the transversal direction of the vehicle, while in Fig. 4c the same relation in x direction has been illustrated, thus in the longitudinal direction of the vehicle.
As also is evident from the drawing, the suggested structural '; ~ of the spring system for vehicle seats and the like according to the invention provides f or a simi-WO 95t30558 2 1 8 9 3 ~ 7 PCT/SE94/00407 lar springing action also in vertical or z direction. In this case, the base plate 5 is similarly journalled freely sli-dable in vertical direction by means of a third set of guide means 11. Said guide means consist of at least two parallell 5 vertical bearing rods llb, which with their upper ends are secured to the base plate and which are journalled in corre-sponding bearing b~lch;ngc lla which are rigidly secured to the floor or base 6 by means of a bed 12. Vertically through 6aid hollow bed 12 extends from a position 13 in the centre 10 of the bottom thereof a yLe_,uLa spring 14 which only has been indicated by a dotted line. At its upper end said pres-6ure spring 14 is secured at a position in vertical ~l;; L
with and preferably also horisontally cs;nr;-l;n~ with the mounting end 9 of the lower end of the tension spring 8.
Owing to said design a still further ; ~ ved springing action might be obtained which has been illustrated in Fig. 4d.
Furth. e, the yLe5~ULa 6pring 14 might be of any suitable known type but preferably said spring also is made0 as a gas-hydraulic spring, particularly provided with damping ction.
Claims (2)
1. A spring system for resilient suspension of objects subjected to great disturbing forces with low frequencies, such as vehicle seats and particularly driver's seats in railway vehicles, and for accommodation of movements with at least three degrees of freedom between object and base, the object (1) by means of two sets of guide means (2, 4) ar-ranged vertically above each other being mounted freely movable substantially horizontally in two directions (x, y) at right angles to each other, c h a r a c t e r i z e d i n that the object (1) is permanently subjected to the force of a tension spring means (8), which at one of its ends is secured to the centre (7) of the horisontal underside of the object (1), supported by the upper set of guide means (2), and at its other end (9) is secured to the centre of the lower set of guide means (4), supported by the base, possibly at a downwards off-set position.
2. A system according to claim 1 and intended to accomo-date also movements with a further degree of freedom, namely in vertical direction (z), c h a r a c t e r i z e d i n that the lower set of guide means (4) in its turn by means of a third set of guide means (12) is freely movably supported in substantially vertical direction (z) under the permanent action of a pressure spring means (15) which at one end is attached to the centre (9) of the second set of guide means (4) and with its other end attached to the base (6) vertical-ly below the first end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2189367 CA2189367A1 (en) | 1994-05-04 | 1994-05-04 | A spring system for resilient suspension of objects, such as vehicle seats |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2189367 CA2189367A1 (en) | 1994-05-04 | 1994-05-04 | A spring system for resilient suspension of objects, such as vehicle seats |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2189367A1 true CA2189367A1 (en) | 1995-11-16 |
Family
ID=4159183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2189367 Abandoned CA2189367A1 (en) | 1994-05-04 | 1994-05-04 | A spring system for resilient suspension of objects, such as vehicle seats |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2189367A1 (en) |
-
1994
- 1994-05-04 CA CA 2189367 patent/CA2189367A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |