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1. (WO1998050250) SEAT ADJUSTMENT MECHANISM
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CLAIMS

1. A combined height and tilt adjustment mechanism for a seat, comprising:
a forward crank for coupling to a seat base and adapted to displace the forward part of the seat base in a substantially vertical direction by rotation of the forward crank about a first axis, said forward crank being coupled to a first linear positioning device for releasably locking the position of said forward crank; and
an aft crank for coupling to the seat base and adapted to displace the aft part of the seat base in a substantially vertical direction by rotation of the aft crank about a second axis, said aft crank being coupled to a second linear positioning device for releasably locking the position of said aft crank.

2. An adjustment mechanism according to claim 1 in which the first and second linear positioning devices are located in a horizontal plane and between the forward crank and the aft crank.

3. An adjustment mechanism according to claim 1 or claim 2 in which the first and second linear positioning devices are adjacent one another and mutually parallel.

4. An adjustment mechanism according to claim 1 , claim 2 or claim 3 in which said forward crank and first linear positioning device comprise substantially identical components to the aft crank and second linear positioning device, respective said components being rotated 180° relative to one another.

5. An adjustment mechanism according to claim 4 further including a forward and aft cross-bar each adapted for mounting onto a pair of parallel seating slides, for forward-aft positional adjustment of the seat, each of said forward and aft cranks being pivotally coupled to said forward and aft cross-bar respectively.

6. An adjustment mechanism according to claim 5 in which said first and second linear positioning devices lie substantially beneath said crossbars so as to occupy substantially the same plane as the seating slides when the adjustment mechanism is attached thereto.

7. An adjustment mechanism according to any preceding claim in which each linear positioning device is coupled to a flexible control cable operable to unlock the respective linear positioning device to reposition the respective crank.

8. An adjustment mechanism according to any preceding claim in which each linear positioning device includes bias means to raise the respective part of the seat when said linear positioning device is unlocked.

9. An adjustment mechanism according to claim 5 in which each linear positioning mechanism comprises a shaft extending through an outer casing, said shaft being lockable in a plurality of longitudinal positions relative to the outer casing by frictional engagement with a coil spring coupled between the outer casing and a release collar coaxial with said shaft and rotatable thereabout, the shafts of the first and second linear positioning devices being coupled respectively to the forward and aft cranks, and the casings of the first and second linear positioning devices being respectively coupled to the aft and forward cross-bars.

10. An adjustment mechanism according to claim 9 in which said linear positioning mechanism is unlockable by rotation of said collar about the shaft to partially unwind said coil spring.

11. An adjustment mechanism according to claim 7 in which both flexible control cables are coupled to a single actuating lever, and in which operation of the actuating lever in a first direction effects release of the first linear positioning device without release of the second linear positioning device, and in which operation of the actuating lever in a second direction effects release of the second linear positioning device without release of the first linear positioning device.

12. An adjustment mechanism according to any preceding claim in which said forward crank and said aft crank each comprise a tubular cross-section crank bar extending laterally from the shaft to a first and a second arm at opposite ends of the crank bar, each arm being pivotally attached to the respective cross-bar.

13. An adjustment mechanism according to claim 12 further including a seat base frame coupled to said forward and aft first and second levers, at least one of said forward and aft cranks including link means adapted to permit limited forward-aft horizontal displacement of the seat base frame relative to the respective crank.

14. A seat adjustment mechanism comprising:
a parallel pair of seating slides for fore and aft positional adjustment of the seat, each seating slide having a fixed portion for fixing to a vehicle and a runner;
a forward and aft cross-bar coupling the runners in a forward and aft position, respectively;

a forward crank, pivotally coupled to the forward cross bar and to a seat base frame;
an aft crank, pivotally coupled to the aft cross-bar and to the seat base frame;
a first linear positioning device coupled to the forward crank and to the aft cross-bar for releasably locking the relative positions thereof; and
a second linear positioning device coupled to the aft crank and to the forward cross-bar for releasably locking the relative positions thereof.

15. A seat adjustment mechanism substantially as described herein with reference to the accompanying drawings.