Extension rod unit

Details Extension rod unit Extension rod unit

2011-08-23

2011-08-23

Sirmons, Kevin C. (Department: 4134)

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

Reexamination Certificate

active

08002242

ABSTRACT:
An extension rod unit includes an outer tube with an inner tube retractably inserted thereto and a ratchet unit is connected to the open top of the outer tube. The ratchet unit includes a connection member and a lever. The connection member includes two side panels and each have a first lug extending therefrom. The lever has two second lugs and the shaft extends through the first and second lugs so as to pivotably connect the lever to the connection member. Two ratchet gears are located between two sets of first and second lugs. A slot is defined axially through the shaft. A driving member has a first end fixed to the fixing part and a second of the driving member extends through the slot of the shaft and is located beyond the outer tube. By pivoting the lever, the inner tube can be moved relative to the outer tube.

REFERENCES:
patent: 2474045 (1949-06-01), Freeland
patent: 2632629 (1953-03-01), Monckmeier
patent: 3049328 (1962-08-01), Bishop
patent: 4434970 (1984-03-01), Boland et al.
patent: 5813647 (1998-09-01), Chen
patent: 5890856 (1999-04-01), Huang
patent: 6210090 (2001-04-01), Wyse
patent: 7316387 (2008-01-01), Lu
patent: 7374380 (2008-05-01), Huang
patent: 2002/0153517 (2002-10-01), Huang
patent: 2005/0087730 (2005-04-01), Hu

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