| 摘要 |
A measuring staff (10) has a upper section (11) including a first elongated member (12) which can carry in a fixed position therealong a laser detector of a laser leveling system or a sighting marker of an optical measuring system, and a second elongated member (13) telescopically extendable and retractable relative to the first member (12), a graduated scale (18) on the first member (13) and a pointer (17) on the second member which indicates the extension or retraction of the second member (13) relative to the first member (12), a spring (20) for urging the second member (13) outwardly from the first member (11), the second member (13) being selectively lockable to the first member, and an extension section (14,15) at the lower end of the upper section and extendable therefrom. |
| 主权项 |
1. A measuring staff for use with a laser leveling system including a laser detector for detecting a laser beam, said staff comprising:
an upper section having a first elongated member and a second elongated member, said second elongated member capable of being extended and retracted relative to the first elongated member, wherein said laser detector is adapted to be located along said first elongated member and fixed thereto in a position aligned in use with said laser beam to define a datum level; a clamping means located on the first elongated member for selectively clamping the second elongate member in an extended or retracted position such that the clamping means locks the second elongate member against movement relative to the first elongate member; a graduated scale on said second elongated member and extending longitudinally therealong; an indicating means located on said first elongated member and adapted to display the graduated scale on said second elongated member whereby to provide, upon extension or retraction of said second elongated member relative to said first elongated member, measurements on said graduated scale of levels above or below said datum level; and a lower extension section extendable from and releasably engageable with said upper section. |
