1. An adjustable height chair including:
a chair top, wherein said chair top is adapted to connect to one of a leg set and a leg extender;
a leg extender set, wherein said leg extender set is adapted to connect to said chair top and said leg set; and
a leg set, wherein said leg set is adapted to connect to one of said chair top and said leg extender,
wherein said chair top is adapted to be positioned at a first vertical height relative to a supporting surface by connecting said chair top directly to said leg set,
wherein said chair top is adapted to be positioned at a second vertical height relative to said supporting surface by connecting said chair to said leg extender set and connecting said leg extender to said leg set.
2. The adjustable height chair of claim 1, wherein said chair top is adapted to directly connect to one of a leg set and a leg extender.
3. The adjustable height chair of claim 1, wherein said leg extender is adapted to directly connect to said chair top and said leg set.
4. The adjustable height chair of claim 1, wherein said leg set is adapted to directly connect to one of said chair top and said leg extender.
5. The adjustable height chair of claim 1, wherein said leg extender is adapted to be positioned between said chair top and said leg set.
6. The adjustable height chair of claim 1, wherein said leg extender is adapted to be positioned between said leg set and said supporting surface.
7. The adjustable height chair of claim 1 further including a second leg extender set, wherein said second leg extender set is adapted to be positioned between either said chair top and said leg extender set or said leg extender set and said leg set.
8. The adjustable height chair of claim 1 further including a second leg extender set, wherein only one of said leg extender set and said second leg extender set is positioned between said chair top and said legs set at any one time.
9. The adjustable height chair of claim 1 further including an apron, wherein said apron is adapted to connect between either said chair top and said leg extender set or between said leg extender set and said leg set.
10. The adjustable height chair of claim 1, wherein said leg extender includes a leg extender fastener aperture.
11. The adjustable height chair of claim 1, wherein said leg set includes a leg fastener aperture.
12. The adjustable height chair of claim 1, wherein said chair top includes an insert element, wherein said leg extender includes an insert aperture, and wherein said chair top insert element is adapted to be introduced into said leg extender insert aperture.
13. An adjustable height chair including:
a chair top, wherein said chair top is adapted to connect to one of a leg set and an apron;
an apron, wherein said apron is adapted to connect to said chair top and said leg set; and
a leg set, wherein said leg set is adapted to connect to one of said chair top and said apron,
wherein said chair top is adapted to be positioned at a first vertical height relative to a supporting surface by connecting said chair top directly to said leg set,
wherein said chair top is adapted to be positioned at a second vertical height relative to said supporting surface by connecting said chair to said apron and connecting said apron to said leg set.
14. The adjustable height chair of claim 13, wherein said chair top is adapted to directly connect to one of a leg set and an apron.
15. The adjustable height chair of claim 13, wherein said apron is adapted to directly connect to said chair top and said leg set.
16. The adjustable height chair of claim 13, wherein said leg set is adapted to directly connect to one of said chair top and said apron.
17. The adjustable height chair of claim 13, wherein said chair top includes a fastening aperture.
18. The adjustable height chair of claim 13, wherein said apron includes a fastening aperture.
19. The adjustable height chair of claim 13, wherein said leg set includes a fastening aperture.
20. An adjustable height chair including:
a chair top, wherein said chair top is adapted to connect to one of a leg set and a height extender;
a height extender, wherein said height extender is adapted to connect to said chair top and said leg set; and
a leg set, wherein said leg set is adapted to connect to one of said chair top and said height extender,
wherein said chair top is adapted to be positioned at a first vertical height relative to a supporting surface by connecting said chair top directly to said leg set,
wherein said chair top is adapted to be positioned at a second vertical height relative to said supporting surface by connecting said chair to said height extender and connecting said height extender to said leg set.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A vehicle steering apparatus for changing a steering angle of steered wheels according to turning of a steering wheel, the apparatus comprising:
a variable transmission ratio device having a motor for steering the steered wheels, wherein the steering angle of the steered wheels is determined by superimposing a first steering angle based on a turning angle of the steering wheel and a second steering angle based on the activation of the motor on each other, and wherein the variable transmission ratio device adjusts the second steering angle, thereby changing the ratio of the steering angle of the steered wheels to the turning angle of the steering wheel;
a calculation unit for calculating a variable value that continuously changes in accordance with a steering characteristic of the vehicle, based on any one of a difference value between an actual yaw rate and a target yaw rate, a difference value between an actual slip angle and a target slip angle, and a difference value between a front wheel slip angle and a rear wheel slip angle;
a control unit, wherein, when the variable value indicates that the steering characteristic is understeer, the control unit controls the variable transmission ratio device to change the second steering angle such that the greater the understeer indicated by the variable value, the smaller the steering angle of the steered wheels relative to the turning angle of the steering wheel becomes; and
a correction unit, wherein, when the differentiated value of the variable value indicates that the understeer is changing to increase, the correction unit corrects the variable value such that the greater the degree of change of the understeer indicated by the differentiated value, the greater the understeer indicated by the variable value becomes.
2. The steering apparatus according to claim 1,
wherein the control unit adjusts an amount of change of the second steering angle based on a direction of steering operation and a turning speed of the steering wheel.
3. The steering apparatus according to claim 2, wherein, when the steering operation direction is a direction that increases the understeer, the control unit increases the amount of change of the second steering angle as the steering wheel turning speed increases.
4. The steering apparatus according to claim 2, wherein, when the steering operation direction is a direction that reduces the understeer, the control unit decreases the amount of change of the second steering angle as the steering wheel turning speed increases.
5. The steering apparatus according to claim 2, wherein the control unit has a map in which the variable value, the steering speed, and the steering operation direction are correlated to the amount of change of the second steering angle or to a gain for determining the amount of change, and wherein the control unit determines the amount of change of the second steering angle based on the map.
6. A method for controlling a vehicle steering apparatus having a motor for changing a steering angle of steered wheels according to turning of a steering wheel, the method comprising:
determining the steering angle of the steered wheels by superimposing a first steering angle based on a turning angle of the steering wheel and a second steering angle based on the activation of the motor on each other;
adjusting the second steering angle for changing the ratio of the steering angle of the steered wheels to the turning angle of the steering wheel;
calculating a variable value that continuously changes in accordance with the steering characteristic of the vehicle, based on any one of a difference value between an actual yaw rate and a target yaw rate, a difference value between an actual slip angle and a target slip angle, and a difference value between a front wheel slip angle and a rear wheel slip angle;
changing, when the variable value indicates that the steering characteristic is understeer, the second steering angle such that the greater the understeer indicated by the variable value, the smaller the steering angle of the steered wheels relative to the turning angle of the steering wheel becomes; and
correcting, when the differentiated value of the variable value indicates that the understeer is changing to increase, the variable value such that the greater the degree of change of the understeer indicated by the differentiated value, the greater the understeer indicated by the variable value becomes.
7. A vehicle steering apparatus for changing a steering angle of steered wheels according to turning of a steering wheel, the apparatus comprising:
a variable transmission ratio device having a motor for steering the steered wheels, wherein the steering angle of the steered wheels is determined by superimposing a first steering angle based on a turning angle of the steering wheel and a second steering angle based on the activation of the motor on each other, and wherein the variable transmission ratio device adjusts the second steering angle, thereby changing the ratio of the steering angle of the steered wheels to the turning angle of the steering wheel; and
a controller for calculating a variable value that indicates a steering characteristic of the vehicle based on the motion state of the vehicle, wherein, when the variable value indicates that the steering characteristic is understeer, the controller controls the variable transmission ratio device to change the second steering angle such that the greater the understeer indicated by the variable value, the smaller the steering angle of the steered wheels relative to the turning angle of the steering wheel becomes, and wherein, when the differentiated value of the variable value indicates that the understeer is changing to increase, the controller corrects the variable value such that the greater the degree of change of the understeer, the greater the understeer becomes.