GB2404233A - Adjustment mechanism - Google Patents
Adjustment mechanism Download PDFInfo
- Publication number
- GB2404233A GB2404233A GB0317108A GB0317108A GB2404233A GB 2404233 A GB2404233 A GB 2404233A GB 0317108 A GB0317108 A GB 0317108A GB 0317108 A GB0317108 A GB 0317108A GB 2404233 A GB2404233 A GB 2404233A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ratchet
- pawl
- adjustment mechanism
- drive
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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
- B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
- B60N2/224—Stepwise movement mechanisms, e.g. ratchets
-
- 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
- B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
- B60N2/225—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by cycloidal or planetary mechanisms
- B60N2/2252—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by cycloidal or planetary mechanisms in which the central axis of the gearing lies inside the periphery of an orbital gear, e.g. one gear without sun gear
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- 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
- B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
- B60N2/235—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by gear-pawl type mechanisms
- B60N2/2352—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by gear-pawl type mechanisms with external pawls
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
An adjustment mechanism for a vehicle seat back inclination assembly comprising an output (12,fig 5) adapted to transfer rotary movement to a rotatable part of a vehicle seat back inclination assembly, a first drive (18,fig 1) operably connected to the output to provide rotary movement during operation of the first drive and a second, independent, drive 28 operably connected to the output to provide rotary movement during operation of the second drive.
Description
ADJUSTMENT MECHANISM
The invention relates to an adjustment mechanism for a vehicle seat back inclination assembly and, in particular, to an adjustment mechanism which can be used to adapt a conventional handwheel operable mechanism to include a lever operable ratchet mechanism.
A vehicle scat back inclination assembly generally includes a rotary part connected to the seat back such that, on rotation of the rotary part, the angle lo of inclination of the seat back is adjusted.
Conventionally, the rotary part is linked to a drive mechanism in the form of a rotatable handwheel such that rotary movement of the handwheel is transferred directly to the rotary part.
The use of a rotatable handwheel permits infinite adjustment of a vehicle seat back. However, when a relatively large adjustment of the angle of inclination is required, it is necessary to turn the handwheel a relatively large number of times. This is inconvenient, particularly if the operator only so wants to adjust the angle of inclination temporarily.
An aim of the invention is to provide an adjustment mechanism for a vehicle seat back inclination assembly having two independent drives to transfer rotary movement to the rotary part of the vehicle seat back inclination assembly.
According to an aspect of the invention there is provided an adjustment mechanism for a vehicle seat back inclination assembly comprising an output adapted to transfer rotary movement to a rotatable part of a vehicle seat back inclination assembly, a first drive operably connected to the À : e. : .e À À output to provide rotary movement during operation of the first drive assembly, and a second independent drive operably connected to the output to provide rotary movement during operation of the second drive.
s The capacity for first and second, independent, drives permits the adjustment mechanism to be constructed to include a drive to provide a means for infinite adjustment of the angle of inclination of a vehicle seat back, and a drive to provide means for incremental adjustment of the angle of inclination of the vehicle seat back.
Embodiments of the invention will now be described, by way of non limiting examples, with reference to the accompanying drawings in which: Figure 1 shows an adjustment mechanism according to an embodiment Is of the invention; Figure 2 shows an exploded perspective view of the adjustment mechanism of Figure 1; Figure 3 shows a cross-sectional view from the front of the adjustment mechanism of Figure 2 along the line I-I; so Figure 4 shows a cross-sectional view from the front of the adjustment mechanism of Figure 2 along the line II-II; Figure 5 shows a cross-sectional view from the rear of the adjustment mechanism of Figure 2 along the line III-III; Figures 6 and 7 show schematic views from the front and rear of an :5 adjustment mechanism according to another embodiment of the invention; and Figures 8 and 9 show schematic cross-sectional views from the front and rear of the adjustment mechanism shown in Figures 6 and 7.
: , 2. . . À À An adjustment mechanism 10 according to an embodiment of the invention is shown in Figure 1.
The adjustment mechanism 10 includes an output 12 (Figure 5) in the form of an output end of a shaft 14. The shaft 14 is formed with a series of splines 16 (Figure 3) assymetrically spaced about its circumference and extending lengthwise along the shaft 14.
A first drive in the form of a handwheel 18 is mounted on the shaft 14 by lo means of a bore 20 (Figure 2) formed in the centre of the handwheel 18 through which the shaft 14 extends.
The bore 20 is preferably formed to define a plurality of splines (not shown) spaced about its circumference and extending lengthwise along the bore 20.
The splines in the bore 20 correspond in size and position to the splines 16 provided on the shaft 14 such that the splines 16 on the shaft 14 engage between corresponding splines in the bore 20 on insertion of the shaft 14 into the bore 20.
so Engagement between the splines 16 on the shaft 14 and the splines in the bore 20 is preferably such that rotation of the handwheel 18 causes rotation of the shaft 14 and, consequently, rotation of the shaft 14 causes rotation of the handwheel 18.
The shaft 14 is prevented from being removed from the bore 20 by means of a spring lock washer 22 slid onto the free end of the shaft 14.
Aperture 20 is preferably enlarged at its outer end 24 and closed by a cap 26.
, . .. . A second drive in the form of a ratchet assembly 28 is also mounted on the shaft 14.
The ratchet assembly 28 includes a ratchet wheel 30 mounted on the shaft 14 by means of a bore 31 (Figure 3) formed in the centre of the ratchet wheel 30 through which the shaft 14 extends. The ratchet wheel 30 is mounted on the shaft 14 such that rotation of the ratchet wheel 30 causes rotation of the shaft 14.
lo The ratchet wheel 30 may be prevented from rotating about the shaft 14 by means of a plurality of splines formed within the bore 31. Such splines preferably correspond in size and position to the splines 16 provided on the shaft 14 such that the splines 16 on the shaft 14 engage between corresponding splines in the bore 31 on insertion of the shaft 14 into the bore 31. Engagement between the splines 16 on the shaft 14 and the splines in the bore 31 is then preferably such that rotation of the ratchet wheel 30 causes rotation of the shaft 14.
The ratchet wheel 30 is contained within a housing formed by a cam plate JO 32 (Figure 3) and a cover 34 (Figure 4), the cover 34 including a front plate 36 and an upstanding wall 38 extending around its periphery. The cover 34 could conveniently be formed as a one-piece moulding.
As illustrated in Figure 2, the cam plate 32 is mounted on the shaft 14 directly behind the ratchet wheel 30 by means of an aperture 40 formed in the centre of the cam plate 32 through which the shaft 14 extends. The cover 34 is mounted on the shaft 14 in front of the ratchet wheel 30 so as to enclose the ratchet wheel 30 between the cover 34 and cam plate 32. The cover 34 is mounted on the shaft 14 by means of an aperture 42 formed in so the centre of the front plate 36 of the cover 34 through which the shaft 14 À :, ' ;.
À . . extends. Both the cam plate 32 and the cover 34 are free to rotate relative to the shaft 14.
Two pawls 44,46 are pivotally mounted relative to the cam wheel 30, within the cover 34, such that teeth 48 formed at one end of each of the pawls 44,46 are movable into and out of engagement with teeth 50 formed about the circumference of the ratchet wheel 30.
Each of the pawls 44,46 is pivotally mounted within the cover 34 by means to of a pivot pin 52,54 extending through an aperture 56,58 formed at or towards one end of each pawl 44,46 remote from teeth 48, and a corresponding aperture 60,62 (Figure 4) formed in the front plate 36.
As shown in Figure 3, the pawls 44,46 are preferably arranged such that they point in opposite directions to each other, one being arranged to point in an anti-clockwise direction relative to the ratchet wheel 30, and the other being arranged to point in a clockwise direction relative to the ratchet wheel 30.
So A pawl pin 64,66 extends through a second aperture 68,70 formed at or towards the other end of each pawl 44,46, and into an elongated slot 72, 74 formed in the front plate 36 at one end and an arcuate cam slot 76,78 formed in the cam plate 32 at the other end.
Engagement of each pawl pin 64,66 in a respective elongated slot 72,74 in the front plate 36 limits pivotal movement of the respective pawl 44,46.
The ratchet assembly 28 also includes a contra-wound spring 80 (Figure 4) mounted on a lug 82 protruding from an exterior surface of the front plate 36 such that the ends of the spring 80 engage the protruding ends of pawls ' a.: pins 64,66, thereby biasing each pawl 44,46 towards engagement with the ratchet wheel 30.
Preferably, the ratchet assembly 28 includes two compression springs 84, 86.
Each spring 84,86 preferably engages between a respective flange (not shown) provided on the inner surface of the upstanding wall 38 of the cover 34 and a stop member 88 provided on the cam plate 32.
The springs 84,86 are preferably arranged such that one spring 84 is lo compressed when the cover 34 is rotated on the shaft 14 in an anticlockwise direction, and the other spring 86 is compressed when the cover 34 is rotated on the shaft 14 in a clockwise direction. In this manner, the spring 84,86 are arranged to bias the cover 34 towards a rest position, as shown in Figure 3. 15:
The cover 34 is preferably formed with a ratchet lever 90 protruding from the exterior surface of the upstanding wall 38. The lever 90 thereby provides a means for rotating the cover 34 on the shaft 14.
In use, the cam plate 32 is preferably fixed to a vehicle seat back inclination assembly 92 by means of teeth 94 protruding from the rear surface of the cam plate 32. Each tooth 94 is preferably shaped to form a shoulder 96 such that the tooth 94 may be received within a complementarily shaped aperture (not shown) formed in the assembly 92 in a snap-fit manner.
The cam plate 32 also preferably includes a locking lug 97 protruding from its rear surface. The lug 98 is received within a corresponding recess 99 formed in the vehicle seat back inclination assembly 92. Such engagement prevents rotation of the cam plate 32 relative to the vehicle seat back so inclination assembly 92. À -
: À : : : À: À : À À À À À . . . . À À À i A rotatable part (not shown) of the vehicle seat back inclination assembly 92 protrudes through an aperture 100 formed in an outer housing 102 of the seat back inclination assembly 92. The protruding end of the rotatable part, preferably in the form of a drive shaft, is received within the hollow interior of shaft 14. The rotatable part is preferably formed to define a plurality of splines spaced about its cirumference and extending axially along its length.
The splines on the rotatable part correspond in size and position to splines defined within the hollow interior of the shaft 14 such that the splines on lo the rotatable part engage between corresponding splines in the hollow interior of the shaft 14 on insertion of the rotatable part into the shaft 14.
Engagement between the splines on the rotatable part and the splines in the hollow interior of the shaft 14 is preferably such that rotation of the shaft 14 causes rotation of the rotatable part.
Such rotation of the shaft 14 may be created by rotating the handwheel 18.
The handwheel 18 thereby provides a means for infinite adjustment of the angle of inclination of a seat back connected to the vehicle seat back so inclination assembly 92.
Rotation of the shaft 14 may also be created by operating the ratchet lever to rotate the cover 34 on shaft 14.
as Movement of the cover 34 causes movement of the pawls 44,46 by virtue of the engagement of each of the pivot pins 52,54 with the front plate 36 and a respective pawl 44,46. This, in turn, causes movement of each of the pawl pins 64,66 along its respective cam slot 76,78 formed in the cam plate 32.
À...2.. ate'.
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Each of the cam slots 76,78 is preferably formed such that, when the cover 34 is located in the rest position, each of the pawl pins 64,66 is located midway along the length of its respective cam slot 76,78 and the profile of the cam slots 76,78 restricts movement of the pawl pins 64,66, thereby s restricting pivotal movement of each of the pawls 44,46 such that the pawls 44,46 arc maintained out of engagement with the ratchet wheel 30.
On movement of the ratchet lever 90 in an anti-clockwise direction, each of the pawl pins 64,66 is forced to move along the length of the respective cam lo slot 76,78 in an anti-clockwise direction.
The profile of the cam slot 76 associated with the pawl 44 facing in an anti- clockwise direction is preferably formed to allow the contra-wound spring to force the teeth 48 of pawl 44 into engagement with the teeth 50 of cam Is wheel 30 on movement of the associated pawl pin 64 in an anticlockwise direction along the cam slot 76 from the rest position.
The profile of the cam slot 78 associated with the pawl 46 facing in a clockwise direction is preferably formed to maintain the pawl 46 out of engagement with the cam wheel 30 on movement of the associated pawl pin 66 in an anti-clockwise direction along the cam slot 78 from the rest position.
Engagement between teeth 48 formed on the pawl 44 and teeth 50 formed on the ratchet wheel 30 is such that continued rotation of the cover 34 in an anti-clockwise direction drives the ratchet wheel 30 to rotate in an anticlockwise direction. Rotation of the ratchet wheel 30 drives the shaft 14, the rotation of which is, in turn, transferred to the rotatable part of the vehicle seat back inclination assembly 92. À
:. :. '. : À..
Similarly, on movement of the ratchet lever 90 in a clockwise direction, each of the pawl pins 64,66 is forced to move along the length of the respective cam slot 76,78 in a clockwise direction.
The profile of the cam slot 78 associated with the pawl 46 facing in a clockwise direction is preferably formed to allow the contra-wound spring to force the teeth 48 of pawl 46 into engagement with the teeth 50 of cam wheel 30 on movement of the associated pawl pin 66 in a clockwise direction along the cam slot 78 from the rest position.
The profile of the cam slot 76 associated with the pawl 44 facing in an anti- clockwise direction is preferably formed to maintain the pawl 44 out of engagement with the cam wheel 30 on movement of the associated pawl pin 64 in a clockwise direction along the cam slot 76 from the rest position.
Engagement between teeth 48 formed on the pawl 46 and teeth 50 formed on the ratchet wheel 30 is such that continued rotation of the cover 34 in a clockwise direction drives the ratchet wheel 30 to rotate in a clockwise direction. Rotation of the ratchet wheel 30 drives the shaft 14, the rotation no of which is, in turn, transferred to the rotatable part of the vehicle seat back inclination assembly 92.
On movement of the ratchet lever 90 the required distance, in either direction, in order to obtain the required rotation of the rotatable part of the vehicle seat back inclination assembly 92, the ratchet lever 90 is released.
The spring bias provided by the compression spring 84,86 which is compressed during rotation of the cover 34 in the required direction acts on the cover 34 to rotate the cover 34 in the opposite direction, and return the ratchet lever 90 to its rest position.
- À .
: He ' e. e. .e À À . On release of the ratchet lever 90, the consequential release in tension within the ratchet assembly 28 causes disengagement of the teeth 48 on the respective pawl 44,46 from the teeth 50 on ratchet wheel 30. This ensures that during rotation of the cover 34 back to the rest position, the teeth 48 on the respective pawl 44,46 pass over the top of the teeth 50 on ratchet wheel 30.
The ratchet assembly 28 thereby provides a means for incremental adjustment of the angle of inclination of a vehicle seat back connected to lo the vehicle seat back inclination assembly 92, the size of the increment being determined in part by the length of the cam slot 76 and in part by the distance moved by the ratchet lever 90.
An adjustment mechanism 110 according to a second embodiment of the invention is shown in Figures 6 and 7.
The adjustment mechanism 110 includes an output 112 in the form of a rotatable ring gear 114 having a plurality of teeth 116 formed on its inner surface.
The ring gear 114 is contained within a concentric housing in the form of a handwheel 118. The ring gear 114 is fixed within the handwheel 118 such that rotation of the handwhecl 118 is transferred directed to the ring gear 114. The handwheel 118 thereby forms a first drive, and preferably includes a rubber handgrip 120 secured to its outer surface.
The adjustment mechanism 110 also includes a second drive in the form of a ratchet assembly 122. À À .
:.. .. ::- À The ratchet assembly 122 includes a face plate 124 mounted for rotation within a channel 125 formed about the inner surface of the handwheel 118, adjacent the ring gear 114. The face plate 124 includes a pivot boss 126 secured to its inner surface at a central location to extend along the axis of s rotation of the face plate 124. A counterweight 128 is also mounted on the face plate 124, below the pivot boss 126.
The pivot boss 126 is preferably secured to the inner surface of the face plate 124 by means of a collet.
A substantially V-shaped pawl member 130 is mounted on the face plate 124, above the pivot boss 126, by means of a pivot pin 132 extending through an aperture located at or towards the apex 131 of the pawl member 130. Each of the opposed limbs 134,136 is formed to define a tooth 135 at Is its remote end.
The pivotal mounting of the pawl member 130 on the face plate 124 is such that the teeth 135 formed on the opposed limbs 134,136 are movable into and out of engagement with the teeth 116 formed in the ring gear 114.
A pendulum 138 is mounted for rotation on the pivot boss 126. The pendulum 138 extends upwards from the pivot boss 126, and an upper portion thereof includes a pendulum pin 140 formed integrally therewith which protrudes towards the pawl member 130.
A counterweight 142 is secured to the lower end of the pendulum 138 so as to maintain the pendulum 138 vertical during rotation of the face plate 124 in use of the adjustment mechanism 110.
:: ; 'e': .^ À . . . :e A pair of triggers 144,146 are pivotally mounted on the pawl member 130 by means of trigger pins 148,150 (Figure 9). Each trigger 144,146 is mounted at one end, within a recess formed on a respective limb 134,136 of the pawl member 130, such that its other end extends towards the pendulum s pin 140.
The face plate 124 preferably includes a pair of paddles 152,154 mounted on an exterior surface to provide a means for turning the face plate 124 within the handwheel 118.
In use, the ring gear 114 is preferably secured directly to the rotatable part (not shown) of a vehicle seat back inclination assembly (not shown) such that rotation of the ring gear 114 is transferred to the rotatable part.
Such rotation of the ring gear 114 may be created by turning the handwheel 118. The handwheel 118 thereby provides a means for inEmite adjustment of the angle of inclination of a seat back connected to the vehicle seat back inclination assembly.
Rotation of the ring gear 114 may also be created by operating the paddles 152,154 to effect rotation of the face plate 124.
Movement of the face plate 124 causes movement of the pawl member 130 by virtue of the fact that the pawl member 130 is mounted on the face plate 124.
The pawl member 130 is preferably mounted on the face plate 124 such that, when the face plate 124 is located in a rest position, the pendulum pin is located midway between the opposed limbs 134,136 of the pawl member 130.
!e.: ..
On movement of the face plate 124 in an anti-clockwise direction, the pawl member 130 moves in an anti-clockwise direction such that the limb 134 facing in a clockwise direction approaches the pendulum pin 140.
The length of the trigger 144 mounted on the clockwise facing limb 134 is preferably chosen such that as the clockwise facing limb 134 approaches the pendulum pin 140, the trigger 144 contacts the pendulum pin 140.
lo This contact causes the trigger 144 to pivot about pivot pin 148. It also causes pivotal movement of the pawl member 130 about pivot pin 132, thereby bringing the tooth 135 formed at the terminal end of the anticlockwise facing limb 136 into engagement with the teeth 116 formed on the ring gear 114.
The pivotal movement of the pawl member 130 allows the trigger 144 to pass beneath the pendulum pin 140, thereby permitting continued movement of the pawl member 130 relative to the pendulum.
So Engagement between the tooth 135 formed at the terminal end of the anti- clockwise facing pawl 136 and the teeth 116 formed in the ring gear 114 is such that continued rotation of the face plate 124 in an anticlockwise direction drives the ring gear 114 to rotate in an anticlockwise direction.
By virtue of the connection of the ring gear 114 with the rotatable part of a vehicle seat back inclination assembly, such rotation of the ring gear 114 is transferred to the rotatable part.
Similarly, on movement of the face plate 124 in a clockwise direction, the trigger 146 mounted on the anti-clockwise facing limb 136 is brought into contact with the pendulum pin 140.
Àe ':e : ' ', '. ' '^ "e Àe This contact causes the trigger 146 to pivot about pivot pin 150. It also causes pivotal movement of the pawl member 130 about pivot pin 132, thereby bringing the tooth 135 formed at the terminal end of the clockwise facing limb 134 into engagement with the teeth 116 formed on the ring gear 114. 1 The pivotal movement of the pawl member 130 allows the trigger 146 to pass beneath the pendulum pin 140, thereby permitting continued lo movement of the pawl member 130 relative to the pendulum 138.
Engagement between the tooth 135 formed at the terminal end of the clockwise facing pawl 134 and the teeth 116 formed in the ring gear 114 is; such that continued rotation of the face plate 124 in a clockwise direction drives the ring gear 114 to rotate in a clockwise direction. By virtue of the connection of the ring gear 114 with the rotatable part of a vehicle seat back inclination assembly, such rotation of the ring gear 114 is transferred to the
rotatable part.
Jo On rotation of the face plate 124 the required distance, in either direction, in order to obtain the required rotation of the rotatable part of the vehicle seat back inclination assembly, the paddles 152,154 are released. The action of gravity on the counterweight 128 mounted on the face plate 124 serves to cause rotation of the face plate 124, and return the face plate 124 to the rest position.
The consequential release in tension, on release of the paddles 152,154, causes pivotal movement of the pawl member 130 about pivot pin 132, thereby disengaging the tooth 135 formed at the terminal end of the so respective limb 134,136 from the teeth 116 provided in the ring gear 114.
À::e A. A: This ensures that during rotation of the face plate 124 back to the rest position, the tooth 135 on the respective limb 134,136 pass over the top of the teeth 116 provided in the ring gear 114.
s The provision of the recesses formed in the limbs 134,136 of the pawl member 130 is such that it allows the respective limb 134,136 to pass the pendulum pin 140 on rotation of the face plate 124 back to the rest position.
Preferably the triggers 144,146 are spring biased by means of springs (not lo shown) which return the triggers 144,146 to their original positions relative to the respective limb 134,136 when they are not in contact with the pendulum pin 130.
The ratchet assembly 122 thereby provides a means for incremental adjustment of the angle of inclination of a vehicle seat back connected to the vehicle seat back inclination assembly, the size of the increment being determined by the amount of rotation of the face plate 124.
À ... ...
i.:.. ... ::. À À
Claims (11)
1. An adjustment mechanism for a vehicle seat back inclination assembly comprising an output adapted to transfer rotary movement to a rotatable part s of a vehicle seat back inclination assembly, a first drive operably connected to the output to provide rotary movement during operation of the first drive and a second, independent, drive operably connected to the output to provide rotary movement during operation of the second drive.
lo
2. An adjustment mechanism according to Claim 1 wherein the output includes a rotatable shaft.
3. An adjustment mechanism according to Claim l wherein the output includes a rotatable wheel.
4. An adjustment mechanism according to any preceding claim wherein the first drive includes a manual adjustment wheel.
5. An adjustment mechanism according to any preceding claim wherein the second drive includes a ratchet mechanism.
6. An adjustment mechanism according to Claim 5 wherein the ratchet mechanism includes a ratchet wheel operably connected to the output and a pawl operably connected to a rotatably mounted ratchet lever and movable into engagement with the ratchet wheel, on rotation of the ratchet lever, to drive the ratchet wheel.
7. An adjustment mechanism according to Claim 6 wherein the ratchet mechanism includes two pawls operably connected to the ratchet lever, one so of the pawls being movable into engagement with the ratchet wheel on À
..e i.:- À..e::.. À À..CLME: rotation of the ratchet lever in a first direction to drive the ratchet wheel in the first direction and the other of the pawls being movable into engagement with the ratchet wheel on rotation of the ratchet lever in the opposite direction to drive the ratchet wheel in the opposite direction.
8. An adjustment mechanism according to Claim 6 or Claim 7 wherein the or each pawl is operably connected to the ratchet lever via a pawl pin, the or each pawl pin being entrained to move along the length of a I respective cam slot on rotation of the ratchet lever and the cam slot being lo shaped to effect movement of the respective pawl into and out of engagement with the ratchet wheel on rotation of the ratchet lever.
9. An adjustment mechanism according to Claim 8 wherein the or each pawl is biased towards the ratchet wheel, and the cam slot is shaped to maintain the or each pawl out of engagement with the ratchet wheel when the ratchet lever is located at a rest position.
10. An adjustment mechanism according to Claim 5 wherein the ratchet mechanism includes a pawl member pivotally mounted on a rotatable face plate, the pawl member being operably associated with an actuation assembly which causes pivotal movement of the pawl member to engage teeth on the pawl member with teeth formed on a rotatable gear wheel, on rotation of the face plate, to drive the gear wheel to rotate in the same direction as the face plate. 25;
11. An adjustment mechanism generally as herein described with reference to and/or as illustrated in the accompanying drawings.
:.:: ::.:. À.
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Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0317108A GB2404233A (en) | 2003-07-22 | 2003-07-22 | Adjustment mechanism |
| PCT/GB2004/003159 WO2005012031A1 (en) | 2003-07-22 | 2004-07-22 | Adjustment mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0317108A GB2404233A (en) | 2003-07-22 | 2003-07-22 | Adjustment mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0317108D0 GB0317108D0 (en) | 2003-08-27 |
| GB2404233A true GB2404233A (en) | 2005-01-26 |
Family
ID=27772432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0317108A Withdrawn GB2404233A (en) | 2003-07-22 | 2003-07-22 | Adjustment mechanism |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2404233A (en) |
| WO (1) | WO2005012031A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007088128A1 (en) * | 2006-01-31 | 2007-08-09 | Hettich Franke Gmbh & Co. Kg | Pivotal fitting |
| WO2009127863A2 (en) * | 2008-04-17 | 2009-10-22 | Simclar Seating Technologies Limited | Tilt limit and locking mechanism for a chair |
| GB2482572A (en) * | 2010-05-14 | 2012-02-08 | Gm Global Tech Operations Inc | Seat inclination ratchet adjustment device |
| DE102014011891A1 (en) | 2014-08-13 | 2016-02-18 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Seat for a motor vehicle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI439224B (en) | 2008-06-26 | 2014-05-21 | Seiji Kagawa | Electromagnetic wave absorption film and electromagnetic wave absorption body using the same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1420670A (en) * | 1972-10-25 | 1976-01-07 | Nissan Motor | Vehicle seat back tilt control mechanism |
| EP0082418A2 (en) * | 1981-12-19 | 1983-06-29 | Nissan Motor Co., Ltd. | Automotive seat |
| US4437703A (en) * | 1980-09-20 | 1984-03-20 | Toyo Kogyo Co., Ltd. | Seat back reclining mechanism |
| US4995669A (en) * | 1988-12-28 | 1991-02-26 | Canadian A.S.E. Limited | Adjustable latching device with memory feature for vehicle seat assemblies |
| US5755491A (en) * | 1996-01-22 | 1998-05-26 | Bertrand Faure Equipements Sa | Hinge mechanism for a vehicle seat, and a seat including such a mechanism |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19927033C2 (en) * | 1999-06-04 | 2001-07-12 | Brose Fahrzeugteile | Double-acting actuator for adjustment devices |
-
2003
- 2003-07-22 GB GB0317108A patent/GB2404233A/en not_active Withdrawn
-
2004
- 2004-07-22 WO PCT/GB2004/003159 patent/WO2005012031A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1420670A (en) * | 1972-10-25 | 1976-01-07 | Nissan Motor | Vehicle seat back tilt control mechanism |
| US4437703A (en) * | 1980-09-20 | 1984-03-20 | Toyo Kogyo Co., Ltd. | Seat back reclining mechanism |
| EP0082418A2 (en) * | 1981-12-19 | 1983-06-29 | Nissan Motor Co., Ltd. | Automotive seat |
| US4995669A (en) * | 1988-12-28 | 1991-02-26 | Canadian A.S.E. Limited | Adjustable latching device with memory feature for vehicle seat assemblies |
| US5755491A (en) * | 1996-01-22 | 1998-05-26 | Bertrand Faure Equipements Sa | Hinge mechanism for a vehicle seat, and a seat including such a mechanism |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007088128A1 (en) * | 2006-01-31 | 2007-08-09 | Hettich Franke Gmbh & Co. Kg | Pivotal fitting |
| WO2009127863A2 (en) * | 2008-04-17 | 2009-10-22 | Simclar Seating Technologies Limited | Tilt limit and locking mechanism for a chair |
| WO2009127863A3 (en) * | 2008-04-17 | 2010-01-21 | Simclar Seating Technologies Limited | Tilt limit and locking mechanism for a chair |
| GB2482572A (en) * | 2010-05-14 | 2012-02-08 | Gm Global Tech Operations Inc | Seat inclination ratchet adjustment device |
| DE102014011891A1 (en) | 2014-08-13 | 2016-02-18 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Seat for a motor vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0317108D0 (en) | 2003-08-27 |
| WO2005012031A1 (en) | 2005-02-10 |
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| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |