| 摘要 |
In a first embodiment, a locking device for horizontal seat positioning of a chair seat has a friction pad or brake pad between the seat pan and the seat plate. A screw and spring assembly is used to resiliently hold the seat pan and seat plate together such that by lifting up on the forward portion of the seat pan, the friction brake is separated from the seat pan or the seat plate allowing the seat pan to be moved horizontally in the forwardly and rearwardly directions, thus adjusting the seat position. When the front of the seat pan is lifted substantially vertically, the screw and spring assembly is compressed to allow one of the seat plate and the seat pan to separate sufficiently from the brake pad and allow relative movement of the seat pan with respect to the seat plate. In a second preferred embodiment, a locking device provides a simple arrangement wherein the friction lock between a seat plate support and a seat pan support can be mechanically released by arcuate rotation of a braking assembly using a mechanical device such as a lever, push-rod, cable, or the like.
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