Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
120 words
A chair comprising a seat, a back, a four bar linkage, said linkage including a base, said seat forming a second link of said linkage, said linkage including a third link having one end portion pivotably connected with a rear portion of said base and an opposite end portion pivotably connected with a rear portion of said seat, a fourth link having a first end portion pivotably connected with a forward portion of said base and a second end portion pivotably connected with a forward portion of said seat, and means for mounting and fixing said back to said fourth link for pivoting movement together with said fourth link about said pivotable connection between said fourth link and said base.
Claim 2
Dependent Claim
120 words
A chair comprising a seat, a back, a four bar linkage, said linkage including a base, said seat forming a second link of said linkage, said linkage including a third link having one end portion pivotably connected with a rear portion of said base and an opposite end portion pivotably connected with a rear portion of said seat, a fourth link having a first end portion pivotably connected with a forward portion of said base and a second end portion pivotably connected with a forward portion of said seat, and means for mounting and fixing said back to said fourth link for pivoting movement together with said fourth link about said pivotable connection between said fourth link and said base.
Claim 3
Dependent Claim
19 words
The chair of claim 1 wherein said means for mounting said back includes an extension of said fourth link.
Claim 4
Dependent Claim
15 words
The chair of claim 2 further including an arm rest formed by said fourth link.
Claim 5
Dependent Claim
19 words
The chair of claim 3 wherein said arm rest is formed by a horizontal portion of said fourth link.
Claim 6
Dependent Claim
18 words
The chair of claim 4 wherein said third and fourth links are formed by upturned portions of tubes.
Claim 7
Dependent Claim
31 words
A chair as set forth in claim 5 wherein said tubes extend horizontally parallel to each other beneath the seat and are journalled for rotation about their axes within said base.
Claim 8
Dependent Claim
29 words
A chair as set forth in claim 6 wherein the fourth link forming tube is journalled in said base at a higher elevation than the third link forming tube.
Claim 9
Dependent Claim
25 words
A chair as set forth in claim 7 wherein the upturned portions of the third link forming tube are pivotally connected to said seat therebeneath.
Claim 10
Dependent Claim
27 words
A chair as set forth in claim 7 wherein the upturned portions of the fourth link forming tube are pivotally connected to the sides of the seat.
Claim 11
Dependent Claim
27 words
A chair as set forth in claim 9 wherein the upturned portions of the fourth link forming tube extend upwardly and then rearwardly to form arm rests.
Claim 12
Dependent Claim
30 words
A chair as set forth in claim 10 wherein said back is isolated from the seat and is fixedly connected between the distal ends of the fourth link forming tubes.
Claim 13
Dependent Claim
25 words
A chair as set forth in claim 6 including a spring in said base operative to return the seat and back to an upright position.
Claim 14
Dependent Claim
36 words
A chair as set forth in claim 12 wherein said spring is a compression spring urging the third link forming tube to rotate in a direction to move the seat and back to an upright position.
Claim 15
Dependent Claim
19 words
A chair as set forth in claim 1 wherein the back and seat tilt ratio is greater than one.
Claim 16
Dependent Claim
16 words
A chair as set forth in claim 14 wherein such ratio is about 3 to 1.
Claim 17
Dependent Claim
34 words
A chair as set forth in claim 1 wherein said back supporting means is part of said linkage, and the seat and back are isolated from each other and supported solely by said linkage.