Supports – Resilient support – Including spring zone understructure
Reexamination Certificate
2011-03-15
2011-03-15
Sterling, Amy J (Department: 3632)
Supports
Resilient support
Including spring zone understructure
C248S415000, C248S578000
Reexamination Certificate
active
07905464
ABSTRACT:
The invention relates to a longitudinally adjustable intermediate piece with a first and second longitudinal element. A spindle nut is placed inside the second longitudinal element and rests via one of its two faces on a friction surface of the second longitudinal element while covering a large area or can be brought into contact therewith. However, a friction-reducing axial bearing is provided between the other face of the spindle nut and the second longitudinal element so that the spindle nut can be set in rotation over the thread when applying an axial tractive force to the longitudinal elements and the longitudinal elements can be continuously pulled out of one another. However, the rotation of the spindle nut is blocked when applying an axial compressive force to the longitudinal elements by means of the frictional resistance between the spindle nut and the friction surface thereby preventing the longitudinal elements from being pushed together. In addition, a longitudinally adjustable intermediate piece is created in which the unidirectionally acting displacement blocking mechanism acts in the opposite direction, i.e. in the pull-out direction.
REFERENCES:
patent: 2872223 (1959-02-01), Shearman et al.
patent: 3687488 (1972-08-01), Tabor
patent: 3778014 (1973-12-01), Driscoll et al.
patent: 3991964 (1976-11-01), Christopher
patent: 6079690 (2000-06-01), Yoon
patent: 2120588 (1972-11-01), None
patent: 2206351 (1973-08-01), None
patent: 39 41 540 (1991-06-01), None
patent: 41 12 641 (1992-10-01), None
patent: 43 22 540 (1994-01-01), None
International Search Report mailed Jun. 12, 2006.
Nixon & Vanderhye P.C.
Sterling Amy J
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