Synchronized chair seat and backrest tilt control mechanism
First Claim
1. A chair control mechanism for use on a chair having a base on which a seat and backrest are supported, the mechanism comprising:
- a housing supported on the base and presenting opposed front and rear ends;
a seat bracket supported on the housing for pivotal movement about a horizontally extending front pivot axis between an upright position and a reclining position, the front pivot axis being located adjacent the front end of the housing;
a backrest bracket supported on the housing for pivotal movement about a horizontally extending rear pivot axis between an upright position and a reclining position, the rear pivot axis being located rearward of the front pivot axis relative to the housing the front pivot axis being located on the housing at a height lower than the rear pivot axis;
a mechanical linkage connected to the brackets at a position spaced rearward of the rear pivot axis relative to the housing for transmitting pivoting movement between the brackets; and
a spring assembly located between the front pivot axis and the rear pivot axis and directly engaging the housing and the backrest bracket for biasing the brackets toward the upright position, said spring assembly engaging the backrest bracket at a point above engagement of the housing.
3 Assignments
0 Petitions
Accused Products
Abstract
A chair control mechanism is provided for use on a chair having a separate seat 14 and backrest 16 that move with respect to a base 12 of the chair. The mechanism 22 includes a housing 26 supported on the base, and brackets 28, 30 secured to the seat and backrest. The seat bracket 28 is supported on the housing for pivotal movement about a horizontally extending front pivot axis 68 between an upright position and a reclining position, and the front pivot axis is located adjacent the front end of the housing. The backrest bracket 30 is supported on the housing for pivotal movement about a horizontally extending rear pivot axis 80 that is located rearward of the front pivot axis. A mechanical linkage 70, 78 is connected between the brackets at a position spaced rearward of the rear pivot axis relative to the housing for transmitting pivoting movement between the brackets, and a spring assembly 32 is connected between the housing and the backrest bracket for biasing the seat and backrest toward the upright position.
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Citations
9 Claims
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1. A chair control mechanism for use on a chair having a base on which a seat and backrest are supported, the mechanism comprising:
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a housing supported on the base and presenting opposed front and rear ends; a seat bracket supported on the housing for pivotal movement about a horizontally extending front pivot axis between an upright position and a reclining position, the front pivot axis being located adjacent the front end of the housing; a backrest bracket supported on the housing for pivotal movement about a horizontally extending rear pivot axis between an upright position and a reclining position, the rear pivot axis being located rearward of the front pivot axis relative to the housing the front pivot axis being located on the housing at a height lower than the rear pivot axis; a mechanical linkage connected to the brackets at a position spaced rearward of the rear pivot axis relative to the housing for transmitting pivoting movement between the brackets; and a spring assembly located between the front pivot axis and the rear pivot axis and directly engaging the housing and the backrest bracket for biasing the brackets toward the upright position, said spring assembly engaging the backrest bracket at a point above engagement of the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification