Chair having a leaf spring in contact with a linkage to provide a resistance to tilting of a backrest of the chair relative to a column of the chair

A process for assembling a chair, the process comprising:

• providing a backrest;
• coupling a seat with the backrest;
• coupling a column with the seat;
• statically attaching a linkage to the backrest, the linkage being rotatably attached below the seat;
• placing a leaf spring that is statically attached at one end in contact with the linkage to provide a resistance to tilting of the backrest relative to the column;
• providing a first structure, wherein a portion of the first structure has an arc shape that includes one or more teeth, wherein the first structure is fixed translationally to the column;
• and
• providing a second toothed structure in contact with the first structure, wherein a portion of the second structure includes one or more teeth,
• wherein the chair is configured such that, when a weight is applied to the seat, the one or more teeth of the second structure move along the one or more teeth of the first structure to provide an increased resistance to tilting of the backrest relative to the column.

A weight-based tilt-resistance assembly configured for use in a chair, the weight-based tilt-resistance assembly comprising:

• a linkage statically attached to a backrest of a chair, the chair also including a seat coupled with the backrest and a column coupled with the seat;
• a leaf spring statically attached at one end and in contact with the linkage to provide a resistance to tilting of the backrest relative to the column;
• a first structure, wherein a portion of the first structure has an arc shape that includes one or more teeth wherein the first structure is fixed translationally to the column;
• and
• a second structure in contact with the first structure, wherein a portion of the second structure includes one or more teeth,
• wherein the chair is configured such that, when a weight is applied to the seat, the one or more teeth of the second structure move along the one or more teeth of the first structure to provide an increased resistance to tilting of the backrest relative to the column.