Chair having a leaf spring with a working length that shortens to increase resistance to tilting of a backrest relative to a column

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 direct contact with the linkage to provide a resistance to tilting of the backrest relative to the column;
• providing a first structure fixed to the column, wherein a portion of the first structure has an arc shape that includes one or more teeth;
• 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 thereby shorten a working length of the leaf spring and 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 fixed at one end and in direct contact with the linkage to provide a resistance to tilting of the backrest relative to the column;
• a first structure fixed to the column, wherein a portion of the first structure has an arc shape that includes one or more teeth;
• 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 thereby shorten a working length of the leaf spring and provide an increased resistance to tilting of the backrest relative to the column.