Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-10-21
2001-04-03
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C384S493000, C384S557000, C384S905000
Reexamination Certificate
active
06210043
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to improvements in systems and methods for installing supports for large structures such as bridges, involving bearings. Typically, these support structures include an elongated shaft for supporting the load rotatably journaled at its opposite ends in pillow blocks mounted on the bridge support structure.
SUMMARY OF THE INVENTION
The present invention is particularly adapted for mounting large bearings on structures such as bridges. More specifically, the present invention provides a system and method wherein two or more bearings are mounted on a shaft or rigid structure wherein one of the bearings is fixed and held in its housing so that the outer ring is constrained from movement in either direction parallel to the axis of rotation and the other bearing or bearings are floating; that is free to move back and forth parallel to the axis or rotation. This freedom of movement in the floating bearing is required in installations of this type to allow for changes in the shaft or the rigid structure to which the inner rings of the bearings are fixed or changes in the bridge foundation which supports the outer rings of the bearing which could produce a change in the distance between the bearings as measured parallel to the axis or rotation. These changes result from various conditions such as temperature which produces differences in thermal expansion rates between the shaft or rigid structure on which the bearing rings are mounted and the foundation on which the pillow blocks are mounted and variations in the loading of the shaft or rigid structure. The present invention provides a system involving a floating bearing to eliminate the possibility of very high thrust loads which could cause severe damage and compromise their ability to function properly in instances where the adjustments cannot be compensated for by a floating bearing arrangement.
REFERENCES:
patent: 2430487 (1947-11-01), Wessenger
patent: 2474489 (1949-06-01), Mortensen
patent: 3497274 (1970-02-01), Yardley
patent: 3516352 (1970-06-01), Lewis
patent: 3807819 (1974-04-01), Zimmer et al.
patent: 4626111 (1986-12-01), Swasey et al.
Hannon Thomas R.
Renz, Jr. , PC Eugene E.
SKF USA Inc.
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