Chair having legs that are adjustable independently and in a coordinated manner

1. A chair comprising:

a person support structure on which a person can be supported, the person support structure including a seating portion on which a person can assume a seated disposition, the seating portion delimiting a seating plane;

a first adjustment system including a first telescoping post and a first inter-stop element and including a first nesting portion, the first nesting portion and the first telescoping post together forming a first leg whose length is lengthened or shortened via movement of the first telescoping post relative to the first nesting portion;

a second adjustment system including a second telescoping post and a second inter-stop element and including a second nesting portion, the second nesting portion and the second telescoping post together forming a second leg whose length is lengthened or shortened via movement of the second telescoping post relative to the second nesting portion, each of the first adjustment system and the second adjustment system being connected to the person support structure, the first adjustment system being disposable between a telescoping movement disposition and a stop set disposition with the first telescoping post and the first inter-stop element being movable relative to one another in the telescoping movement disposition and relative movement between the first telescoping post and the first inter-stop element being resisted when the first telescoping post and the first inter-stop element are in the stop set disposition, and the second adjustment system being disposable between a telescoping movement disposition and a stop set disposition with the second telescoping post and the second inter-stop element being movable relative to one another in the telescoping movement disposition and relative movement between the second telescoping post and the second inter-stop element being resisted when the second telescoping post and the second inter-stop element are in the stop set disposition; and

a switch over element, the switch over element being disposable between a staging disposition and a down select disposition, the switch over element being operatively connected to the first adjustment system and the second adjustment system such that disposing the switch over element in its staging disposition effects a respective movement of the first adjustment system from its stop set disposition to its telescoping movement disposition and a respective movement of the second adjustment system from its stop set disposition to its telescoping movement disposition and disposing the switch over element in its down select disposition effects a respective movement of the first adjustment system out of its telescoping movement disposition into readiness to assume its stop set disposition and a respective movement of the second adjustment system out of its telescoping movement disposition into readiness to assume its stop set disposition and the switch over element being configured such that a predetermined actuation of the switch over element disposes the switch over element in its staging disposition and this predetermined actuation of the switch over element is operable to effect both the respective movement of the first adjustment system from its stop set disposition to its telescoping movement disposition and the respective movement of the second adjustment system from its stop set disposition to its telescoping movement disposition, the first adjustment structure and the second adjustment structure contributing in supporting the seating portion at a spacing above a surface, the first telescoping post being movable relative to the first nesting portion to lengthen the first leg or to shorten the first leg and the first telescoping post being engageable by the first inter-stop element at a respective engagement location along its extent that comes into registry with the first inter-stop element after the first telescoping post has moved telescopically outwardly relative to the first nesting portion to lengthen the first leg or has moved telescopically inwardly relative to the first nesting portion to shorten the first leg, whereupon the telescoping movements of the first telescoping post relative to the first nesting portion and the engagement of the first telescoping post at the various engagement locations by the first inter-stop element operate to vary a height at which the first adjustment structure supports the seating portion above a surface, and the second telescoping post being movable relative to the second nesting portion to lengthen the second leg or to shorten the second leg and the second telescoping post being engageable by the second inter-stop element at a respective engagement location along its extent that comes into registry with the second inter-stop element after the second telescoping post has moved telescopically outwardly relative to the second nesting portion to lengthen the second leg or has moved telescopically inwardly relative to the second nesting portion to shorten the second leg. whereupon the telescoping movements of the second telescoping post relative to the second nesting portion and the engagement of the second telescoping post at the various engagement locations by the second inter-stop element operate to vary a height at which the second adjustment structure supports the seating portion above a surface and the chair being disposable between an unfolded position in which the first adjustment system and the second adjustment system are at a lateral spacing from one another, as viewed parallel to the seating plane, and a folded position in which the first adjustment system and the second adjustment system are at a different lateral spacing from one another, as viewed parallel to the seating plane, that is less than the lateral spacing of the first adjustment system and the second adjustment system from one another in the unfolded position of the chair.

2. A chair according to claim 1 , and further comprising a biasing arrangement that biases the first adjustment system and the second adjustment system to each automatically move into its respective stop set disposition after (a) the switch over element in its down select disposition has effected a respective movement of the first adjustment system out of its telescoping movement disposition into readiness to assume its stop set disposition and a respective movement of the second adjustment system out of its telescoping movement disposition into readiness to assume its stop set disposition and (b) a predetermined respective alignment of the first telescoping post and the first inter-stop element with one another and a predetermined respective alignment of the second telescoping post and the second inter-stop element with one another have occurred.

3. A chair according to claim 2 , wherein, in the stop set disposition of the first adjustment structure, the first inter-stop element is operable to engage the first telescoping post at a first set stop location that is at a fixed spacing from the person support structure such that the first inter-stop element and the first telescoping post are releasably secured to one another at the first stop set location and, in the telescoping movement disposition, the first inter-stop element is operable to disengage from the first telescoping post to thereby permit movement of the first telescoping post relative to the first set stop location and, after the first telescoping post has subsequently telescoped outwardly or inwardly relative to the first nesting portion, the first inter-stop element is operable to subsequently re-engage the first telescoping post at the first set stop location with the first set stop location remaining at the same fixed spacing from the person support structure during both the initial engagement of the first inter-stop element with the first telescoping post and the re-engagement of the first inter-stop element with the first telescoping post and, in the stop set disposition of the second adjustment structure, the second inter-stop element is operable to engage the second telescoping post at a second set stop location that is at a fixed spacing from the object support portion such that the second inter-stop element and the second telescoping post are releasably secured to one another at the second stop set location and, in the telescoping movement disposition, the second inter-stop element is operable to disengage from the second telescoping post to thereby permit movement of the second telescoping post relative to the second set stop location and, after the second telescoping post has subsequently telescoped outwardly or inwardly relative to the second nesting portion, the second inter- stop element is operable to subsequently re-engage the second telescoping post at the second set stop location with the second set stop location remaining at the same fixed spacing from the person support structure during both the initial engagement of the second inter-stop element with the second telescoping post and the re-engagement of the second inter-stop element with the second telescoping post.

4. A chair according to claim 3 , wherein the switch over element includes a cable that engages the first inter-stop element and the second inter-stop element.

5. A chair according to claim 4 , wherein the first adjustment structure includes a first nesting portion, the first telescoping post and the first nesting portion are operatively interconnected to one another such that the first telescoping post can move relative to the first nesting portion, the first inter-stop element includes a first pin component that is movable supported by the first nesting portion and engaged by the cable of the switch over element, the switch over element is operable to effect movement of the first pin component between a pin engagement position in which the first pin component engages the first telescoping post and a pin disengage position in which the first pin component is disengaged from the first telescoping post, the second adjustment structure includes a second nesting portion, the second telescoping post and the second nesting portion are operatively interconnected to one another such that the second telescoping post can move relative to the second nesting portion, the second inter-stop element includes a second pin component that is movable supported by the second nesting portion and engaged by the cable of the switch over element, and the switch over element is operable to effect movement of the second pin component between a pin engagement position in which the second pin component engages the second telescoping post and a pin disengage position in which the second pin component is disengaged from the second telescoping post.

6. A chair according to claim 5 , wherein the first pin component is biased towards its pin engagement position and the second pin component is biased towards its pin engagement position in which the first pin component is disengaged from the first telescoping post, and the cable of the switch over element is movable to effect movement of the first pin component and the second pin component in a direction from its respective pin engagement position towards its pin disengagement position against the bias towards its pin engagement position.