The chair adjustment mechanism, attached beneath a chair arm, has a housing and four walls forming an interior closed space. A closing bottom wall has a longitudinal guide slot. A longitudinal continuous serpentine adjustment cam surface. A cam follower on an adjustment plate moves on the cam surfac
The chair adjustment mechanism, attached beneath a chair arm, has a housing and four walls forming an interior closed space. A closing bottom wall has a longitudinal guide slot. A longitudinal continuous serpentine adjustment cam surface. A cam follower on an adjustment plate moves on the cam surface in the interior space. The adjustment plate movably extends through the guide slot in a close fit and substantially closes the guide slot thereat. In one embodiment, each sidewall defines an opposing cam surface and a pair of cam followers extend laterally from an upper region of the adjustment plate. The lower plate extends outward from the slot and is preferably attached to two chair legs. The adjustment plate moves vertically, first out from the depending cam ridges, then the plate and cam follower moves longitudinally, and then moves vertically into a different intersection between adjacent depending cam ridges.
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1. An adjustment mechanism for a chair which adjustment mechanism is attached beneath a chair arm rest, comprising: a housing attached beneath the chair arm rest, the housing having a forward wall, a rearward wall and a pair of opposing side walls extending between the forward and rear walls and a b
1. An adjustment mechanism for a chair which adjustment mechanism is attached beneath a chair arm rest, comprising: a housing attached beneath the chair arm rest, the housing having a forward wall, a rearward wall and a pair of opposing side walls extending between the forward and rear walls and a bottom wall which collectively define, in conjunction with the chair arm rest, an interior closed space;the bottom wall having a single guide slot therein extending longitudinally in the housing and having a predetermined lateral slot width;said housing, defining in said interior closed space, a longitudinal continuous serpentine adjustment surface having at least first and second longitudinally spaced adjustment surface segments, the serpentine adjustment surface defines a cam surface for a cam follower on an adjustment plate which adjustment plate movably extends through said guide slot;said adjustment plate having an upper plate region extending into said interior closed space and a lower plate region extending below the bottom wall of said housing, the upper and lower adjustment plate regions being planar with a thickness complementary to said guide slot lateral width such that the adjustment plate substantially closes the guide slot thereat;said cam follower formed in the upper plate region which moves over the serpentine cam surface as the adjustment plate moves longitudinally within the interior closed space;said lower plate region extends outward from said guide slot and is configured to be attachable to a component of the chair;wherein the adjustment plate is movable between a first vertical position and a second vertical position relative to the housing, in the first vertical position the adjustment plate is able to move in the longitudinal direction from one side of the serpentine cam surface to the other side of the serpentine cam surface, in the second vertical position the cam follower on the adjustment plate is able to engage either one of the first and second adjustment surface segments to selectively adjust a longitudinal position of the adjustment plate relative to the housing. 2. An adjustment mechanism for a chair as claimed in claim 1 wherein the serpentine adjustment surface which includes a plurality of depending rounded cam ridges, each cam ridge having a rearward-facing substantially vertical cam ridge section and a forward-facing angled cam ridge section such that release of said adjustment plate and cam follower from an intersection of a respective angled cam ridge section and an adjacent vertical cam ridge section requires adjustment plate movement between the first vertical position and the second vertical position. 3. An adjustment mechanism for a chair as claimed in claim 2 wherein each intersection between the respective angled cam ridge section and the adjacent vertical cam ridge section defines a rounded cam ridge rest section. 4. An adjustment mechanism for a chair as claimed in claim 3 wherein each of said first and said second adjustment surface segments are respectively formed by: a respective rearward-facing substantially vertical cam ridge section, the corresponding intersection and the corresponding adjacent angled cam ridge section. 5. An adjustment mechanism for a chair as claimed in claim 4 wherein each said angled cam ridge section defines an acute angle with respect to one or more vertical cam ridge sections. 6. An adjustment mechanism for a chair as claimed in claim 5 wherein a forward-most angled cam ridge terminates in a rearward-facing loop cam surface. 7. An adjustment mechanism for a chair as claimed in claim 6 wherein the terminal rearward-facing loop cam surface forms a complementary angled cam surface, complementary to the adjacent angled cam ridge section. 8. An adjustment mechanism for a chair as claimed in claim 7 wherein said bottom wall of said housing defines a lower cam surface limiting said cam follower when the plate moves longitudinally while in said first vertical position. 9. An adjustment mechanism for a chair as claimed in claim 2 wherein a forward-most angled cam ridge terminates in a rearward-facing loop cam surface. 10. An adjustment mechanism for a chair as claimed in claim 2 wherein each of said first and said second adjustment surface segments are respectively formed by: a respective rearward-facing substantially vertical cam ridge section, the corresponding intersection and the corresponding adjacent angled cam ridge section. 11. An adjustment mechanism for a chair as claimed in claim 2 wherein each said angled cam ridge section defines an acute angle with respect to one or more vertical cam ridge sections. 12. An adjustable chair, comprising a stationary portion and an adjustable portion that is adjustable relative to the stationary portion, wherein the stationary portion comprises a frame portion and the adjustable portion comprises a backrest portion and an armrest portion, the chair further comprising an adjustment mechanism that permits adjustment of the adjustable portion into a selected one of at least two adjustment positions defined by respective cam surfaces, the adjustment mechanism having: a housing attached beneath the armrest portion, the housing having a forward wall, a rearward wall and a pair of opposing side walls extending between the forward and rear walls and a bottom wall which collectively define, in conjunction with the armrest portion, an interior closed space;the bottom wall having a single guide slot therein extending longitudinally in the housing and having a predetermined lateral slot width;said housing, defining in said interior closed space, a longitudinal continuous serpentine adjustment surface defining the at least two adjustment positions longitudinally spaced apart as adjustment surface segments, the serpentine adjustment surface defines a cam surface for a cam follower on an adjustment plate which adjustment plate movably extends through said guide slot;said adjustment plate having an upper plate region extending into said interior closed space and a lower plate region extending below the bottom wall of said housing, the upper and lower adjustment plate regions being planar with a thickness complementary to said guide slot lateral width such that the adjustment plate substantially closes the guide slot thereat;said cam follower formed in the upper plate region which moves over the serpentine cam surface as the adjustment plate moves longitudinally within the interior closed space;said lower plate region extends outward from said guide slot and is configured to be attachable to the stationary portion of the chair;wherein the adjustment plate is movable between a first vertical position and a second vertical position relative to the housing, in the first vertical position the adjustment plate is able to move in the longitudinal direction from one side of the serpentine cam surface to the other side of the serpentine cam surface, in the second vertical position the cam follower on the adjustment plate is able to engage either one of the first and second adjustment surface segments to selectively adjust a longitudinal position of the adjustment plate relative to the housing to the at least two adjustment positions. 13. An adjustable chair as claimed in claim 12 wherein the serpentine adjustment surface which includes a plurality of depending rounded cam ridges, each cam ridge having a rearward-facing substantially vertical cam ridge section and a forward-facing angled cam ridge section such that release of said adjustment plate and cam follower from an intersection of a respective angled cam ridge section and an adjacent vertical cam ridge section requires adjustment plate movement between the first vertical position and the second vertical position. 14. An adjustable chair as claimed in claim 13 wherein each intersection between the respective angled cam ridge section and the adjacent vertical cam ridge section defines a rounded cam ridge rest section. 15. An adjustable chair as claimed in claim 14 wherein each of said first and said second adjustment surface segments are respectively formed by: a respective rearward-facing substantially vertical cam ridge section, the corresponding intersection and the corresponding adjacent angled cam ridge section. 16. An adjustable chair as claimed in claim 15 wherein each said angled cam ridge section defines an acute angle with respect to one or more vertical cam ridge sections. 17. An adjustable chair as claimed in claim 16 wherein a forward-most angled cam ridge terminates in a rearward-facing loop cam surface. 18. An adjustable chair as claimed in claim 17 wherein the terminal rearward-facing loop cam surface forms a complementary angled cam surface, complementary to the adjacent angled cam ridge section. 19. An adjustable chair as claimed in claim 18 wherein said bottom wall of said housing defines a lower cam surface limiting said cam follower when the plate moves longitudinally while in said first vertical position. 20. An adjustable chair as claimed in claim 13 wherein a forward-most angled cam ridge terminates in a rearward-facing loop cam surface. 21. An adjustable chair as claimed in claim 13 wherein each of said first and said second adjustment surface segments are respectively formed by: a respective rearward-facing substantially vertical cam ridge section, the corresponding intersection and the corresponding adjacent angled cam ridge section. 22. An adjustable chair as claimed in claim 13 wherein each said angled cam ridge section defines an acute angle with respect to one or more vertical cam ridge sections.
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