| 摘要 |
An adjustable bolt assembly is disclosed. The bolt assembly forms part of a cylindrical lock set by connection to a cylindrical lock assembly such that the backset of the bolt assembly can be easily adjusted. The cylindrical lock assembly includes a chassis housing a shuttle with the cylindrical lock assembly being operable to move the shuttle relative to the chassis so as to move a lock bolt of the bolt assembly between an operative position and an inoperative position. The bolt assembly can be operated in a short backset mode or a long backset mode. The bolt assembly includes a housing (11), a lock bolt, a draw bar (15) and a tail bar (8) associated with the draw bar (15) which has a tail end connected to the shuttle. The lock bolt is movable relative to the housing between an extended operating position and a retracted non-operating position. The draw bar (15) has a head end connected to the bolt. A detent (17) is biased towards connecting the tail bar (8) and the draw bar (15) so that they operate together in normal use. When the detent (17) is moved out of engagement, the tail bar (8) is movable in an axial direction relative to the draw bar (15) so as to adjust the operation of the bolt assembly between the short backset mode and the long backset mode. A conversion tool (23) may be used to facilitate the change in mode.
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