Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
50 words
A chair comprising a seat (11) and a back (12), each supported on a base (10), characterized by means (24) interconnecting said base (10), seat (11) and back (12) whereby said seat (11) and back (12) tilt but said back (12) tilts to a greater degree than said seat (11).
Claim 2
Dependent Claim
50 words
A chair comprising a seat (11) and a back (12), each supported on a base (10), characterized by means (24) interconnecting said base (10), seat (11) and back (12) whereby said seat (11) and back (12) tilt but said back (12) tilts to a greater degree than said seat (11).
Claim 3
Dependent Claim
36 words
A chair as claimed in claim 1, further characterized in that said means (24) comprises a four bar linkage (24), wherein one of the links (27) of said linkage (24) extending to support said back (12).
Claim 4
Dependent Claim
16 words
A chair as claimed in claim 2, further characterized in that said linkage (24) is non-parallel.
Claim 5
Dependent Claim
29 words
A chair as claimed in claim 2 or claim 3, further characterized in that said seat (11) and base (10) form top and bottom sides of said linkage (24).
Claim 6
Dependent Claim
34 words
A chair as claimed in claim 4, further characterized in that the fore and aft sides of the linkage (24) extend upwardly from the base (10) in the form of an upwardly opening V.
Claim 7
Dependent Claim
29 words
A chair as claimed in claim 5, further characterized in that the ideal pivot (52) of the back of a user is on a line substantially bisecting such V.
Claim 8
Dependent Claim
34 words
A chair as claimed in claim 6, further characterized in that the fore side of the linkage (24) extends to support said back (12), and is bent to form an arm rest (43, 44).
Claim 9
Dependent Claim
43 words
A chair as claimed in claim 6 or claim 7, further characterized in that a line through the base pivot of the fore side of the linkage (24) normal to the link formed by the seat (11) substantially intersects said ideal pivot (52).
Claim 10
Dependent Claim
65 words
A chair as claimed in any one of claims 5 to 8, further characterized in that the fore and aft sides of the linkage (24) are formed by upturned portions (29, 30, 38, 39) of tubes (26, 27), wherein said tubes (26, 27) extending horizontally parallel to each other beneath the seat (11) and are journalled for rotation about their axes within said base (10).
Claim 11
Dependent Claim
34 words
A chair as claimed in claim 9, further characterized in that the fore linkage forming tube (27) is journalled in said base (10) at a higher elevation than the aft linkage forming tube (26).
Claim 12
Dependent Claim
31 words
A chair as claimed in claim 10, further characterized in that the upturned portions (29, 30) of the aft linkage forming tube (26) are pivotally connected to said seat (11) therebeneath.
Claim 13
Dependent Claim
33 words
A chair as claimed in claim 10, further characterized in that the upturned portions (38, 39) of the fore linkage forming tube (27) are pivotally connected to the sides of the seat (11).
Claim 14
Dependent Claim
35 words
A chair as claimed in claim 10, further characterized in that said back (12) is isolated from the seat (11) and is fixedly connected between the distal ends of the fore linkage forming tube (27).
Claim 15
Dependent Claim
69 words
A chair as claimed in any one of claims 9 to 13, further characterized in that a spring (62) is provided in said base (10) operative to return the seat (11) and back (12) to an upright position, said spring (62) being a compression spring urging the aft linkage forming tube (26) to rotate in a direction to move the seat (11) and back (12) to an upright position.
Claim 16
Dependent Claim
33 words
A chair as claimed in any preceding claim, further characterized in that the back (12) and seat (11) tilt ratio is greater than one and in the order of about 3 to 1.