| 摘要 |
A pneumatic height adjustment column is provided for a chair. The column includes a support tube (7), carrier tube (13), pneumatic cartridge (17), hub fastener (35), and shaft fastener (51). The support tube has a top end which is generally open, and a bottom portion (9) which is adapted to be mounted to a chair base. The bottom portion has an opening (16) with a smaller diameter than that of the support tube (7). The carrier tube (13) has a top portion adapted to be mounted to a support housing (6) for a chair seat. The top portion has an opening with a smaller diameter than that of the carrier tube (13). The carrier tube (13) also has a generally open bottom end which telescopically engages the top end of the support tube. The pneumatic cartridge (17) has a cylinder (19) positioned within the carrier tube (13), a shaft (23) and hub (30). The cylinder (19) has a diameter greater than that of the opening in the carrier tube (13). The shaft (23) extends downwardly from the cylinder (19) and has a bottom end which passes through the opening in the bottom of the support tube (7). The hub (30) is disposed on a top portion of the cylinder (19) and passes through the opening in the top of the carrier tube (13). The hub fastener (35) releasably engages the hub (30) and carrier tube (13). The shaft fastener (51) is attached to the shaft (23) and maintains the position of the bottom end of the shaft (23) through the opening in the bottom of the support tube (7).
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