Implements or apparatus for applying pushing or pulling force – Vehicle attached jack – Hydraulic or pneumatic
Reexamination Certificate
2005-09-27
2005-09-27
Watson, Robert C. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Vehicle attached jack
Hydraulic or pneumatic
Reexamination Certificate
active
06948702
ABSTRACT:
A hydraulic lift for a truck trailer, having a pair of hydraulic cylinders mounted to the under side of a semi-trailer. The bottom of the cylinder pistons are connected to a foot, which sits on the ground. A telescoping jackstand positioned between the two cylinders, and can be locked into its extended position with a locking pin. The jackstand acts as a safety device in case the hydraulic system looses pressure, and also acts to take the load off of the hydraulic cylinders when the trailer needs to sit for extended periods of time.
REFERENCES:
patent: 4723756 (1988-02-01), Stumpf, Jr.
patent: 5377957 (1995-01-01), Mosley
patent: 5401046 (1995-03-01), Schwartz et al.
patent: 6142501 (2000-11-01), Fogo et al.
patent: 6322062 (2001-11-01), Conn et al.
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