CA2158549A1 - Vehicle seat suspension unit - Google Patents
Vehicle seat suspension unitInfo
- Publication number
- CA2158549A1 CA2158549A1 CA002158549A CA2158549A CA2158549A1 CA 2158549 A1 CA2158549 A1 CA 2158549A1 CA 002158549 A CA002158549 A CA 002158549A CA 2158549 A CA2158549 A CA 2158549A CA 2158549 A1 CA2158549 A1 CA 2158549A1
- Authority
- CA
- Canada
- Prior art keywords
- slide plate
- brake
- brake slide
- vehicle seat
- suspension unit
- 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
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
-
- 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
- B60N2/505—Adjustable suspension including height adjustment
-
- 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
- B60N2/544—Compression or tension springs
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Seats For Vehicles (AREA)
- Braking Arrangements (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
A damping unit (10) for a vehicle seat suspension unit has a brake slide plate (17) mounted on an anchor pin (11) on one side rail (111) of the bottom frame of the suspension unit, the anchor pin (11) being received in a non-circular hole provided with an O-ring (15). A transfer assembly (115) has a pivot pin (19) received in an elongate slot (21) in the brake slide plate (17), and brake washers (22), compressed by Belleville washers (24), are clamped between brackets (127) on the transfer assembly (115) and the brake slide plate (17). On small displacement from a preset datum, the brake slide plate (17) moves relative to the anchor pin (11) and no damping force is generated. When a preset displacement is exceeded, the anchor pin (11) restrains the brake slide plate (17) and the pivot pin (19) moves in the slot (21) to generate a constant damping force between the brake slide plate (17) and brake washers (22).
Description
WO94/21~7 215 8 5 ~ 9 PCT/AU94/00134 TITLE: "VEHICLE SEAT SUSPENSION UNIT"
BACKGROUND OF THE INVENTION
1. Field of the Invention THIS INVENTION relates to a vehicle seat suspension unit. In particular, it relates to a "decelerator" or damper for such a sus~n-c;on unit.
BACKGROUND OF THE INVENTION
1. Field of the Invention THIS INVENTION relates to a vehicle seat suspension unit. In particular, it relates to a "decelerator" or damper for such a sus~n-c;on unit.
2. Prior Art In International Application Nos.
PCT/AU90/00144 (WO 90/11841) and PCTIAU92~00647 (WO
93/10996), we disclosed vehicle seat suspPnci~n units where a single transfer assembly transfers the spring force to the seat platform at a varying rate.
SUMMARY OF THE ~N-l INVENTION
It is an object to provide a ~mpi ng means where there is substantially zero damping about an initial preset seat height but where the ~mp; ng increases as the deflection of the seat from the preset height increases.
It is a preferred object to provide a unit which allows an overall reduction in spring rate which in turn provides an increase in isolation efficiency.
Other preferred objects will hPc~mP apparent from the following description.
Throughout the specification, a vehicle seat suspension unit "of the type defined" shall be used to include a susp~n-cinn unit having:
a base frame mountable on a vehicle;
a seat support frame to mou~t an operator's seat;
a scissor arms assembly interronn~rting the frames to enable the frames to move relative to each other substantially in par~llPli .cm;
a transfer assem~ly pivotally mounted on one of the frames, having at least one arm engaging the other of the frames; and WO94/21~7 215 8 5 4 9 PCT/AU94/00134 spring means mounted on the one frame and connected to the transfer assembly.
In one aspect, the present invention resides in a "deceleration" or damping unit for a vehicle seat suspension unit ~eg. of the type ~efine~) inc~ i nq a brake slide plate having a longitll~i n~l slot at or adjacent one end thereof and a hole at or adjacent the other end;
an anchor pin passing through the hole and mounted on one frame of the vehicle seat suspencion unit;
resilient ring or washer means about the anchor pin received within the hole to allow at least limited ~uov~uent of the brake sli~e plate relative to the anchor pin;
a pivot pin on a tr~nC~er ~cc~mhly 0~ the vehicle seat sUsp~nci nn unit pA-C-Ci ng throu~h the s~ot and arranged for ~ v~l,.e~l~ within the slot subs~nt;~l1y parallel to the longitn~;n~ ;s of the brake slide plate;
at least one brake disc or washer interposed between the transfer assem~ly and the brake slide plate;
and means to apply a clamping or frictional load between the brake disc or washer and the brake slide plate;
so arranged that when the vehicle seat suspension unit is displaced in an initial small distance from a preset position, the brake slide plate moves relative to the anchor pin to provide substantially zero ~m~; ng, but on further ~i.cr1~r~m~ntr the brake slide plate is moved relatively to the pivot pin and a substantially constant damping force is generated between the brake slide plate and the brake disc or washer.
W094121~7 215 8 5 19 PCT/AU94/00134 Preferably, the damping force is substantially constant throughout the full range of displacement from r the initial small distance.
Preferably, the damping force may be 5 selectively set by varying the ~Amping force applied between the brake slide plate and the brake disc~s) or washer(s). Belleville springs or compre~i nn washers may be provided on the pivot pin to transfer the damping force from an adjustable nut on the pivot pin to the lO brake slide plate and brake disc~s) or washer~s).
Preferably, the hole is slightly eccentric, being preferably non-circular and formed by two circles with spaced centres.
Preferably, when the vehicle seat susp~ncinn 15 unit is displaced, the initial small distance, the brake slide plate and pivot pin mo~e in 11ni~Qn but on furth_r displacement, the brake slide plate Pn~ An~ is restrained from further .lluv~llel~L by the anchor pin and the brake slide plate moves relative to the pivot pin.
In a second aspect, the present invention resides in a vehicle seat suspension unit of the type defined fitted with the "decelerator" or ~Am~i ng unit.
BRIEF DESC~RIPIION OF TE~E DRAWINGS
To enable the invention to be fully 2S understood, a preferred embodime~t will now be descri~ed with reference to the ~ccnmpAnyin~ dr~ ng~ in whi~h:
FIGS l and 2 are side views of the vehicle seat suspension unit in its raised and lowered positions, respectively;
PCT/AU90/00144 (WO 90/11841) and PCTIAU92~00647 (WO
93/10996), we disclosed vehicle seat suspPnci~n units where a single transfer assembly transfers the spring force to the seat platform at a varying rate.
SUMMARY OF THE ~N-l INVENTION
It is an object to provide a ~mpi ng means where there is substantially zero damping about an initial preset seat height but where the ~mp; ng increases as the deflection of the seat from the preset height increases.
It is a preferred object to provide a unit which allows an overall reduction in spring rate which in turn provides an increase in isolation efficiency.
Other preferred objects will hPc~mP apparent from the following description.
Throughout the specification, a vehicle seat suspension unit "of the type defined" shall be used to include a susp~n-cinn unit having:
a base frame mountable on a vehicle;
a seat support frame to mou~t an operator's seat;
a scissor arms assembly interronn~rting the frames to enable the frames to move relative to each other substantially in par~llPli .cm;
a transfer assem~ly pivotally mounted on one of the frames, having at least one arm engaging the other of the frames; and WO94/21~7 215 8 5 4 9 PCT/AU94/00134 spring means mounted on the one frame and connected to the transfer assembly.
In one aspect, the present invention resides in a "deceleration" or damping unit for a vehicle seat suspension unit ~eg. of the type ~efine~) inc~ i nq a brake slide plate having a longitll~i n~l slot at or adjacent one end thereof and a hole at or adjacent the other end;
an anchor pin passing through the hole and mounted on one frame of the vehicle seat suspencion unit;
resilient ring or washer means about the anchor pin received within the hole to allow at least limited ~uov~uent of the brake sli~e plate relative to the anchor pin;
a pivot pin on a tr~nC~er ~cc~mhly 0~ the vehicle seat sUsp~nci nn unit pA-C-Ci ng throu~h the s~ot and arranged for ~ v~l,.e~l~ within the slot subs~nt;~l1y parallel to the longitn~;n~ ;s of the brake slide plate;
at least one brake disc or washer interposed between the transfer assem~ly and the brake slide plate;
and means to apply a clamping or frictional load between the brake disc or washer and the brake slide plate;
so arranged that when the vehicle seat suspension unit is displaced in an initial small distance from a preset position, the brake slide plate moves relative to the anchor pin to provide substantially zero ~m~; ng, but on further ~i.cr1~r~m~ntr the brake slide plate is moved relatively to the pivot pin and a substantially constant damping force is generated between the brake slide plate and the brake disc or washer.
W094121~7 215 8 5 19 PCT/AU94/00134 Preferably, the damping force is substantially constant throughout the full range of displacement from r the initial small distance.
Preferably, the damping force may be 5 selectively set by varying the ~Amping force applied between the brake slide plate and the brake disc~s) or washer(s). Belleville springs or compre~i nn washers may be provided on the pivot pin to transfer the damping force from an adjustable nut on the pivot pin to the lO brake slide plate and brake disc~s) or washer~s).
Preferably, the hole is slightly eccentric, being preferably non-circular and formed by two circles with spaced centres.
Preferably, when the vehicle seat susp~ncinn 15 unit is displaced, the initial small distance, the brake slide plate and pivot pin mo~e in 11ni~Qn but on furth_r displacement, the brake slide plate Pn~ An~ is restrained from further .lluv~llel~L by the anchor pin and the brake slide plate moves relative to the pivot pin.
In a second aspect, the present invention resides in a vehicle seat suspension unit of the type defined fitted with the "decelerator" or ~Am~i ng unit.
BRIEF DESC~RIPIION OF TE~E DRAWINGS
To enable the invention to be fully 2S understood, a preferred embodime~t will now be descri~ed with reference to the ~ccnmpAnyin~ dr~ ng~ in whi~h:
FIGS l and 2 are side views of the vehicle seat suspension unit in its raised and lowered positions, respectively;
3 0 FIGS 3 and 4 are sectional side views of the unit correspon~ing to FIGS 1 and 2, respectively, with parts omitted for clarity;
FIG 5 is a front view of the transfer assembly, with one of the springs and one ~Am~i n~ unit 3 5 shown in ~h~ li n~s;
WO94Q1~7 PCT/AU94/00l34 2~s~5 ~9 FIG 6 is a side view corresponding to FIG 5;
FIG 7 is a side view of the brake plate when assembled; and FIG 8 is a sectional top view of the damping unit when installed.
DETAITFn DESCRIPT~ON OF ~ ~K~KK~ ~MR~ N'l'~
The vehicle seat susp~nc~ nn unit 100 has a bottom frame 110 (with side rails 111) and a top rame 112 (with plate 113) interconnected by a sC;ccor arms assembly 114 for relative ILlOv~u~,t suhstantially in parallelism (ie. see WO 90/11841) and WO 93/10996). The bottom frame llQ is bolted to the seat Cli~C~ fixed to the vehicle floor, and the operator's seat is secured to the top frame 112 ~see in particular WO 93~10996).
A tr~nsfer ass~mhly 115 has a tubular bQdy 116 journalled on an axle 116a inter~nn~ting brackets 117 on the side rails 111 of the bottom frame 110.
A pair of transfer arms 118 extend from the body 116 and SU~Ol L the axle 119 for rollers 120 which bear on the underside of the plate 113 on the top frame 112.
Two springs 121, anchored at one end to the bottom frame 110, are connected to respective pairs of brackets 122 ext~nA; n~ below the tubular body 116 of the transfer assembly 115. By selective ad~u~L~uL of the anchoring of the coil sprin~s 121 (eg. by an electrically driven ad~u~"~uL unit 123), the Sus~nc; on unit 100 can be preset to a given ride height for the seat which sets a datum.
A respective pair of links 124 are pivotally connected to the side ra~ls 111 of the bott~m frame 110 and have pins 125 s1; ~Ahl ~ in slots 126 in the side rails 127 of the top frame 112. The links 124 limit the forward disp~ m~nt of the top frame 112 relative to the bottom fr~me 110 if the v~hi~lP should be involved WO94121~7 215 8 5 ~ 9 PCTIAU94100134 in an accident and so the links 124 assist in securing the seat from ~re~ki ng away from the vehicle.
The damping unit 10 will now be described.
A respective anchor pin 11 passes through each side rail 111 of the bottom frame 110 ~nd through a boss 12 on a bracket 117. The anchor pin 11 is fitted with a nut 14.
The pin 11 passes through an O-ring 15 (see FIG 7) in an elongate hole 16 in a planar brake slide plate 17. (The hole 16 is formed by two circles with offset centres and allows limited ~o~ t of the brake slide plate 17 relative to the anchor pin 11 along the longitll~;n~l axis of the brake slide plate 17.) (Washers 18 may be provided to allow low friction ~l~o~llent of the brake plate 17 between the boss 12 and the lower end of the inner -cc;~cnr arms 124 of the scissor assemhly 114.) The lower ends of the in~er scissor arms 124 are slotted, with the anchor pins 11 passing through the slots 125 and the arms 124 are supported for low friction on the ~n~h~r pins 11 by bearings 126.
A respective pivot pin 19, with head 20, is supported by a respective pair of brackets 127 at each end of the tubular body 16 and pass through an elon~Ate slot 21 along the longittl~i n~ 1 axis of the ~rake c1;~
plate 17.
A pair of fibre brake washers 22 are interposed between the ~rake slide plate 17 and brackets 127 and a damping force thereon is provided by a nut 23 and a pair of Belleville spring washers 24. As the brake slide plate 17 moves relative to the pivot pin 19 and the fibre brake washers 22 a constant friction is generated between the brake p~ate 117 and the brake washers 22.
At the datum height of the seat, the ~nchor 2~5~5~ 6 pin 11 is intermediate the hole 16 in the brake slide plate 17 (see FIG 7). For small initial displA~m~nts of the suspension unit 100, the brake slide plate 17 will move relative to the anchor pin 11 without the latter engaging a side of the hole 16. ~The O-ring compression softens any initial impact when the anchor pin 11 engages either side of the hole~16.) There is no ,llo~l,ent of the brake slide plate 17 relative to the pivot pin 19 as the brake slide plate 17 moves in llni.co~
with brackets 127 on the transfer assembly 115.
If the displacement of the suspension unit lQ0 causes the brake slide plate 17 to engage the Anchor pin 11 on one side of the hole 16, then further displAr~m~nt causes the anchor pin 11 to restr~i n the brake slide plate 17 and thereby pull (or push) the brake slide plate 17 relative to the brackets 31 on the transfer assemhly, and also relative to the brak wA.ch~r~ 22.
The constant rate friction generated between the brake slide plate 17 and ~rake washers 22 creates a decelerating or damping force to oppose the displA~m~nt and this damping force will also be generated as the suspension unit re~urns to (or passes) the datum position. (On the return stroke, the brake slide plate 17 will move so that the anchor pin 11 will engage the opposite side of the hole 16.) It will be readily apparent to the .~kill~
addressee that the decelerator or ~A~;ng unit 10 provides substantially zero ~Amr; ng about the datum ~ie.
zero displ~cement) p~sition of the S~ n~i on unit 100 but will provide substantially constant ~Amri ng once a preset disp1 A~ L is e~ee~. This enables very high isolation of the seat from the VPh ~ to be achieved, whilst having only a very low spring rate in the springs 121.
Various changes and mo~ifi~A tions may be made 21585~9 ~ WO94/21487 to the embodiments described and illustrated without departing from the scope of the present invention defined in the appended claims.
FIG 5 is a front view of the transfer assembly, with one of the springs and one ~Am~i n~ unit 3 5 shown in ~h~ li n~s;
WO94Q1~7 PCT/AU94/00l34 2~s~5 ~9 FIG 6 is a side view corresponding to FIG 5;
FIG 7 is a side view of the brake plate when assembled; and FIG 8 is a sectional top view of the damping unit when installed.
DETAITFn DESCRIPT~ON OF ~ ~K~KK~ ~MR~ N'l'~
The vehicle seat susp~nc~ nn unit 100 has a bottom frame 110 (with side rails 111) and a top rame 112 (with plate 113) interconnected by a sC;ccor arms assembly 114 for relative ILlOv~u~,t suhstantially in parallelism (ie. see WO 90/11841) and WO 93/10996). The bottom frame llQ is bolted to the seat Cli~C~ fixed to the vehicle floor, and the operator's seat is secured to the top frame 112 ~see in particular WO 93~10996).
A tr~nsfer ass~mhly 115 has a tubular bQdy 116 journalled on an axle 116a inter~nn~ting brackets 117 on the side rails 111 of the bottom frame 110.
A pair of transfer arms 118 extend from the body 116 and SU~Ol L the axle 119 for rollers 120 which bear on the underside of the plate 113 on the top frame 112.
Two springs 121, anchored at one end to the bottom frame 110, are connected to respective pairs of brackets 122 ext~nA; n~ below the tubular body 116 of the transfer assembly 115. By selective ad~u~L~uL of the anchoring of the coil sprin~s 121 (eg. by an electrically driven ad~u~"~uL unit 123), the Sus~nc; on unit 100 can be preset to a given ride height for the seat which sets a datum.
A respective pair of links 124 are pivotally connected to the side ra~ls 111 of the bott~m frame 110 and have pins 125 s1; ~Ahl ~ in slots 126 in the side rails 127 of the top frame 112. The links 124 limit the forward disp~ m~nt of the top frame 112 relative to the bottom fr~me 110 if the v~hi~lP should be involved WO94121~7 215 8 5 ~ 9 PCTIAU94100134 in an accident and so the links 124 assist in securing the seat from ~re~ki ng away from the vehicle.
The damping unit 10 will now be described.
A respective anchor pin 11 passes through each side rail 111 of the bottom frame 110 ~nd through a boss 12 on a bracket 117. The anchor pin 11 is fitted with a nut 14.
The pin 11 passes through an O-ring 15 (see FIG 7) in an elongate hole 16 in a planar brake slide plate 17. (The hole 16 is formed by two circles with offset centres and allows limited ~o~ t of the brake slide plate 17 relative to the anchor pin 11 along the longitll~;n~l axis of the brake slide plate 17.) (Washers 18 may be provided to allow low friction ~l~o~llent of the brake plate 17 between the boss 12 and the lower end of the inner -cc;~cnr arms 124 of the scissor assemhly 114.) The lower ends of the in~er scissor arms 124 are slotted, with the anchor pins 11 passing through the slots 125 and the arms 124 are supported for low friction on the ~n~h~r pins 11 by bearings 126.
A respective pivot pin 19, with head 20, is supported by a respective pair of brackets 127 at each end of the tubular body 16 and pass through an elon~Ate slot 21 along the longittl~i n~ 1 axis of the ~rake c1;~
plate 17.
A pair of fibre brake washers 22 are interposed between the ~rake slide plate 17 and brackets 127 and a damping force thereon is provided by a nut 23 and a pair of Belleville spring washers 24. As the brake slide plate 17 moves relative to the pivot pin 19 and the fibre brake washers 22 a constant friction is generated between the brake p~ate 117 and the brake washers 22.
At the datum height of the seat, the ~nchor 2~5~5~ 6 pin 11 is intermediate the hole 16 in the brake slide plate 17 (see FIG 7). For small initial displA~m~nts of the suspension unit 100, the brake slide plate 17 will move relative to the anchor pin 11 without the latter engaging a side of the hole 16. ~The O-ring compression softens any initial impact when the anchor pin 11 engages either side of the hole~16.) There is no ,llo~l,ent of the brake slide plate 17 relative to the pivot pin 19 as the brake slide plate 17 moves in llni.co~
with brackets 127 on the transfer assembly 115.
If the displacement of the suspension unit lQ0 causes the brake slide plate 17 to engage the Anchor pin 11 on one side of the hole 16, then further displAr~m~nt causes the anchor pin 11 to restr~i n the brake slide plate 17 and thereby pull (or push) the brake slide plate 17 relative to the brackets 31 on the transfer assemhly, and also relative to the brak wA.ch~r~ 22.
The constant rate friction generated between the brake slide plate 17 and ~rake washers 22 creates a decelerating or damping force to oppose the displA~m~nt and this damping force will also be generated as the suspension unit re~urns to (or passes) the datum position. (On the return stroke, the brake slide plate 17 will move so that the anchor pin 11 will engage the opposite side of the hole 16.) It will be readily apparent to the .~kill~
addressee that the decelerator or ~A~;ng unit 10 provides substantially zero ~Amr; ng about the datum ~ie.
zero displ~cement) p~sition of the S~ n~i on unit 100 but will provide substantially constant ~Amri ng once a preset disp1 A~ L is e~ee~. This enables very high isolation of the seat from the VPh ~ to be achieved, whilst having only a very low spring rate in the springs 121.
Various changes and mo~ifi~A tions may be made 21585~9 ~ WO94/21487 to the embodiments described and illustrated without departing from the scope of the present invention defined in the appended claims.
Claims (14)
1. A "deceleration" or damping unit for a vehicle seat suspension unit including:
a brake slide plate having a longitudinal slot at or adjacent one end thereof and a hole at or adjacent the other end;
an anchor pin passing through the hole and mounted on one frame of the vehicle seat suspension unit;
resilient ring or washer means about the anchor pin received within the hole to allow at least limited movement of the brake slide plate relative to the anchor pin;
a pivot pin on a transfer assembly of the vehicle seat suspension unit passing through the slot and arranged for movement within n the slot substantially parallel to the longitudinal axis of the brake slide plate;
at least one brake disc or washer interposed between the transfer assembly and the brake slide plate;
and means to apply a clamping or frictional load between the brake disc or washer and the brake slide plate;
so arranged that when the vehicle seat suspension unit is displaced an initial small distance from a preset position, the brake slide plate moves relative to the anchor pin to provide substantially zero damping, but on further displacement, the brake slide plate is moved relative to the pivot pin and a substantially constant damping force is generated between the brake slide plate and the brake disc or washer.
a brake slide plate having a longitudinal slot at or adjacent one end thereof and a hole at or adjacent the other end;
an anchor pin passing through the hole and mounted on one frame of the vehicle seat suspension unit;
resilient ring or washer means about the anchor pin received within the hole to allow at least limited movement of the brake slide plate relative to the anchor pin;
a pivot pin on a transfer assembly of the vehicle seat suspension unit passing through the slot and arranged for movement within n the slot substantially parallel to the longitudinal axis of the brake slide plate;
at least one brake disc or washer interposed between the transfer assembly and the brake slide plate;
and means to apply a clamping or frictional load between the brake disc or washer and the brake slide plate;
so arranged that when the vehicle seat suspension unit is displaced an initial small distance from a preset position, the brake slide plate moves relative to the anchor pin to provide substantially zero damping, but on further displacement, the brake slide plate is moved relative to the pivot pin and a substantially constant damping force is generated between the brake slide plate and the brake disc or washer.
2. A damping unit according to Claim 1 or Claim 2 wherein:
the damping force is substantially constant through the full range of displacement from the initial small distance.
the damping force is substantially constant through the full range of displacement from the initial small distance.
3. A damping unit according to Claim 1 or Claim 2 wherein:
the damping force may be selectively set by varying the damping force applied between the brake slide plate and the brake disc(s) or washer(s).
the damping force may be selectively set by varying the damping force applied between the brake slide plate and the brake disc(s) or washer(s).
4. A damping unit according to Claim 3 wherein:
Belleville springs or like compression means are provided on the pivot pin to transfer the damping force from an adjustable nut on the pivot pin to the brake slide plate and the brake disc(s) or washer(s).
Belleville springs or like compression means are provided on the pivot pin to transfer the damping force from an adjustable nut on the pivot pin to the brake slide plate and the brake disc(s) or washer(s).
5. A damping unit according to any one of Claims 1 to 4 wherein:
the hole is slightly eccentric, being non-circular and formed by two circles with spaced centres.
the hole is slightly eccentric, being non-circular and formed by two circles with spaced centres.
6. A damping unit according to any one of Claims 1 to 5 wherein:
when the vehicle seat suspension unit is displaced the initial small distance, the brake slide plate and pivot pin move in unison but on further displacement, the brake slide plate engages and is restrained from further movement by the anchor pin and the brake slide plate moves relative to the pivot pin to generate the damping force.
when the vehicle seat suspension unit is displaced the initial small distance, the brake slide plate and pivot pin move in unison but on further displacement, the brake slide plate engages and is restrained from further movement by the anchor pin and the brake slide plate moves relative to the pivot pin to generate the damping force.
7. A damping unit as claimed in Claim 6 wherein:
the limited movement of the brake slide plate relative to the anchor pin is substantially parallel to the longitudinal arm of the brake slide plate.
the limited movement of the brake slide plate relative to the anchor pin is substantially parallel to the longitudinal arm of the brake slide plate.
8. A vehicle seat suspension unit including:
a base frame mountable on a vehicle;
a seat support frame to mount an operator's seat;
a scissor arms assembly incorporating the frames to enable the frames to move relative to each other substantially in parallelism;
a transfer assembly pivotally mounted on one of the frames, having at least one arm engaging the other of the frames;
spring means mounted on the one frame and connected to the transfer assembly; and a decelerator or damping unit including:
a brake slide plate having a longitudinal slot at or adjacent one end thereof and a non-circular hole at or adjacent the other end;
an anchar pin passing through the hole and mounted on one of the frames;
resilient ring or washer means about the anchor pin received within the hole to allow at least limited movement of the brake slide plate relative to the anchor pin;
a pivot pin on the transfer assembly passing through the slot and arranged for movement within the slot substantially parallel to the longitudinal axis of the brakc slide plate;
at least one brake disc or washer interposed between the transfer assembly and the brake slide plate;
and means to apply a clamping or frictional load between the brake disc or washer and the brake slide plate;
so arranged that when the vehicle seat suspension unit is displaced an initial small distance from a preset position, the brake slide plate moves relative to the anchor pin to provide substantially zero damping, but on further displacement, the brake slide plate is moved relative to the pivot pin and substantially constant damping force is generated between the brake plate and the brake disc or washer.
a base frame mountable on a vehicle;
a seat support frame to mount an operator's seat;
a scissor arms assembly incorporating the frames to enable the frames to move relative to each other substantially in parallelism;
a transfer assembly pivotally mounted on one of the frames, having at least one arm engaging the other of the frames;
spring means mounted on the one frame and connected to the transfer assembly; and a decelerator or damping unit including:
a brake slide plate having a longitudinal slot at or adjacent one end thereof and a non-circular hole at or adjacent the other end;
an anchar pin passing through the hole and mounted on one of the frames;
resilient ring or washer means about the anchor pin received within the hole to allow at least limited movement of the brake slide plate relative to the anchor pin;
a pivot pin on the transfer assembly passing through the slot and arranged for movement within the slot substantially parallel to the longitudinal axis of the brakc slide plate;
at least one brake disc or washer interposed between the transfer assembly and the brake slide plate;
and means to apply a clamping or frictional load between the brake disc or washer and the brake slide plate;
so arranged that when the vehicle seat suspension unit is displaced an initial small distance from a preset position, the brake slide plate moves relative to the anchor pin to provide substantially zero damping, but on further displacement, the brake slide plate is moved relative to the pivot pin and substantially constant damping force is generated between the brake plate and the brake disc or washer.
9. A vehicle seat suspension unit according to Claim 8 wherein:
the damping force is substantially constant through the full range of displacement from the initial small distance.
the damping force is substantially constant through the full range of displacement from the initial small distance.
10. A vehicle seat suspension unit according to Claim 8 or Claim 9 wherein:
the damping force may be selectively set by varying the damping force applied between the brake slide plate and the brake disc(s) or washer(s).
the damping force may be selectively set by varying the damping force applied between the brake slide plate and the brake disc(s) or washer(s).
11. A vehicle seat suspension unit according to Claim 10 wherein:
Belleville springs or like compression means are provided on the pivot pin to transfer the damping force from an adjustable nut on the pivot pin to the brake slide plate and the brake disc(s) or washer(s).
Belleville springs or like compression means are provided on the pivot pin to transfer the damping force from an adjustable nut on the pivot pin to the brake slide plate and the brake disc(s) or washer(s).
12. A vehicle seat suspension unit according to any one of Claims 8 to 11 wherein:
the hole is slightly eccentric, being non-circular and formed by two circles with spaced centres.
the hole is slightly eccentric, being non-circular and formed by two circles with spaced centres.
13. A vehicle seat suspension unit according to any one of Claims 8 to 12 wherein:
when the vehicle seat suspension unit is displaced the initial small distance, the brake slide plate and pivot pin move in unision but on further displacement, the brake slide plate engages and is restrained from further movement by the anchor pin and the brake slide plate moves relative to the pivot pin to generate the damping force.
when the vehicle seat suspension unit is displaced the initial small distance, the brake slide plate and pivot pin move in unision but on further displacement, the brake slide plate engages and is restrained from further movement by the anchor pin and the brake slide plate moves relative to the pivot pin to generate the damping force.
14. A vehicle seat suspension unit according to Claim 13 wherein:
the limited movement of the brake slide plate relative to the anchor pin is substantially parallel to the longitudinal axis of the brake slide plate.
the limited movement of the brake slide plate relative to the anchor pin is substantially parallel to the longitudinal axis of the brake slide plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPL7862 | 1993-03-17 | ||
| AUPL786293 | 1993-03-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2158549A1 true CA2158549A1 (en) | 1994-09-29 |
Family
ID=3776783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002158549A Abandoned CA2158549A1 (en) | 1993-03-17 | 1994-03-17 | Vehicle seat suspension unit |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0689509A4 (en) |
| JP (1) | JPH08507739A (en) |
| KR (1) | KR960700916A (en) |
| CN (1) | CN1122587A (en) |
| BR (1) | BR9406320A (en) |
| CA (1) | CA2158549A1 (en) |
| WO (1) | WO1994021487A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7983813B2 (en) * | 2004-10-29 | 2011-07-19 | Bose Corporation | Active suspending |
| US20090198419A1 (en) * | 2008-02-05 | 2009-08-06 | Bose Corporation | Suspended seat autolocking |
| LU92012B1 (en) * | 2012-05-30 | 2013-12-02 | Iee Sarl | Vehicle seat suspension mat |
| CA2897774C (en) | 2013-01-16 | 2018-07-17 | Hendrickson Usa, L.L.C. | Damper for suspension of heavy-duty vehicle |
| US9199563B2 (en) | 2013-06-04 | 2015-12-01 | Bose Corporation | Active suspension of a motor vehicle passenger seat |
| MX2017011730A (en) | 2015-03-25 | 2017-11-13 | Hendrickson Usa Llc | Damping air spring and shock absorber combination for heavy-duty vehicle axle/suspension systems. |
| NZ735508A (en) | 2015-05-11 | 2019-02-22 | Hendrickson Usa Llc | Air spring with damping characteristics for heavy-duty vehicles |
| US10696198B2 (en) * | 2018-07-19 | 2020-06-30 | Ford Global Technologies, Llc | AV and transport scissor jack rear seat system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993010996A1 (en) * | 1991-12-02 | 1993-06-10 | Rosdon Engineering & Manufacturing Pty. Ltd. | Vehicle seat suspension unit |
-
1994
- 1994-03-17 CN CN94192031A patent/CN1122587A/en active Pending
- 1994-03-17 EP EP94911006A patent/EP0689509A4/en not_active Withdrawn
- 1994-03-17 KR KR1019950703927A patent/KR960700916A/en not_active Application Discontinuation
- 1994-03-17 JP JP6520422A patent/JPH08507739A/en active Pending
- 1994-03-17 WO PCT/AU1994/000134 patent/WO1994021487A1/en not_active Application Discontinuation
- 1994-03-17 CA CA002158549A patent/CA2158549A1/en not_active Abandoned
- 1994-03-17 BR BR9406320A patent/BR9406320A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| BR9406320A (en) | 1995-12-26 |
| WO1994021487A1 (en) | 1994-09-29 |
| KR960700916A (en) | 1996-02-24 |
| JPH08507739A (en) | 1996-08-20 |
| CN1122587A (en) | 1996-05-15 |
| EP0689509A1 (en) | 1996-01-03 |
| EP0689509A4 (en) | 1997-03-05 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |