Trailer tongue jack

Implements or apparatus for applying pushing or pulling force – Vehicle attached jack – Attached to trailer tongue

Reexamination Certificate

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Details

C254S419000, C254S425000

Reexamination Certificate

active

06926261

ABSTRACT:
A trailer tongue jack includes a grease (or zerk) fitting for providing grease to internal parts The jack includes an outer tube and an inner telescoping tube. A threaded insert (or nut) is fixedly attached inside an upper end of the inner telescoping tube. A screw shaft threadedly cooperates with the insert to extend or retract the inner telescoping tube from a lower end of the outer tube. A crank is provided to turn the screw shaft either directly or through gears, and a thrust bearing carries a vertical load between the screw shaft and the outer tube. The grease fitting allows the internal parts, and the thrust bearing in particular, to be easily lubricated.

REFERENCES:
patent: 2159395 (1939-05-01), Mersereau
patent: 2638315 (1953-05-01), Wagner
patent: 3288435 (1966-11-01), Starkey
patent: 3314692 (1967-04-01), Karns
patent: 3345037 (1967-10-01), Sweetland, Jr.
patent: 3351321 (1967-11-01), Grams et al.
patent: 3764109 (1973-10-01), Hollis, Jr.
patent: 3783960 (1974-01-01), Feliz
patent: 5125290 (1992-06-01), Cotter
patent: 5421555 (1995-06-01), Sims
patent: 5435523 (1995-07-01), Hying et al.
patent: 5462269 (1995-10-01), Schroeder et al.
patent: 5560655 (1996-10-01), Cameron
patent: 6267357 (2001-07-01), Ebey et al.
patent: 6485002 (2002-11-01), Goss

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