Geometrical instruments – Straight-line light ray type – Rod or target
Patent
1990-03-01
1991-12-10
Cuchlinski, Jr., William A.
Geometrical instruments
Straight-line light ray type
Rod or target
33809, 403324, 403109, G01C 1500, F16B 710
Patent
active
050706209
ABSTRACT:
An extensible and retractable rod including an outer section and an inner section telescopically received in the outer section for extension and retraction relative thereto. The outer section has an opening therein including an upper peripheral edge. A detent member associated with the inner section is spring biased to move laterally of the inner section to releasably lock the inner section in an extended position relative to the outer section. The detent member has an upper surface and a lower surface, each having a laterally outer edge, and a laterally outwardly facing surface extending between the laterally outer edges of the upper and lower surfaces. The laterally outwardly facing surface includes a camming surface which engages the outer section at the lower peripheral edge of the opening for pivoting the detent member so that the upper surface of the detent member projects into the opening in the outer section as the detent member begins to move into registration with the opening. The upper surface of the detent member engages the upper peripheral edge of the opening upon further extension of the inner section to stop the extension of the inner section when the detent member is in full registration with the opening. The detent member then pivots to its outward position in which the upper and lower surfaces of the detent member project no more than a small distance outwardly beyond the outer section.
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Crain Jeffrey A.
Crain Stephen B.
Cuchlinski Jr. William A.
Wirthlin Alvin
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