Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
In a swivel chair having a seat member, a main screw member secured to and extending downwardly from said seat member, a supporting base, and a tubular main screw mounting assembly located on said base, said screw being positioned for rotational movement in said mounting assembly, a washer positioned concentrically on said mounting assembly and formed of material having a low coefficient of friction, a ring shaped member frictionally mounted on said screw so that in the absence of external forces thereon said ring shaped member is maintained in a fixed position on said screw during rotation of said screw, said ring shaped member being positioned concentrically on said washer in contact with the top surface thereof and being formed of material having a substantially higher coefficient of friction than the material from which said washer is formed, and a nut threadably mounted on said screw at a position above and in contact with the top side of said ring shaped member so that rotation of said seat and screw causes identical rotation of said ring shaped member and said nut, thereby precluding any change in the vertical position of said seat as a result of rotation thereof, only relative rotation of said screw and said nut being effective to cause raising or lowering of said seat.
Claim 2
Dependent Claim
217 words
In a swivel chair having a seat member, a main screw member secured to and extending downwardly from said seat member, a supporting base, and a tubular main screw mounting assembly located on said base, said screw being positioned for rotational movement in said mounting assembly, a washer positioned concentrically on said mounting assembly and formed of material having a low coefficient of friction, a ring shaped member frictionally mounted on said screw so that in the absence of external forces thereon said ring shaped member is maintained in a fixed position on said screw during rotation of said screw, said ring shaped member being positioned concentrically on said washer in contact with the top surface thereof and being formed of material having a substantially higher coefficient of friction than the material from which said washer is formed, and a nut threadably mounted on said screw at a position above and in contact with the top side of said ring shaped member so that rotation of said seat and screw causes identical rotation of said ring shaped member and said nut, thereby precluding any change in the vertical position of said seat as a result of rotation thereof, only relative rotation of said screw and said nut being effective to cause raising or lowering of said seat.
Claim 3
Dependent Claim
41 words
A swivel chair according to claim 1 wherein said main screw is provided with an uninterrupted external thread extending over at least a portion of the length of said screw on which said nut and said ring shaped member are mounted.
Claim 4
Dependent Claim
44 words
A swivel chair according to claim 1 wherein said main screw mounting assembly includes an upright sleeve member located in said base and having an open upper end, said screw being located concentrically in said sleeve, and said washer being supported on said sleeve.