Drive screw system with nested mobile supports
Patent 5531557 Issued on July 2, 1996. Estimated Expiration Date: 
July 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2961277 3305049 3728903 Lubricated drive mechanism Manipulator of articles and methods of moving articles over an extended distance Linear positioning apparatus Threaded spindle-nut drive assembly with vibration reducing support nut arrangement Intermediate support device for screw shaft Vehicle restraining device Patent #: 5375965 InventorAssigneeApplicationNo. 269835 filed on 07/01/1994US Classes:414/401, Means serves to align wheeled vehicle and load receiving or relinquishing structure74/424.72, Plural longitudinally variably spaced nuts188/32, On ground254/98, SCREW384/53, Location of plural roller sets; more than two telescoping members410/30, Wheel cradle, chock, or well414/584Means comprises device or member for moving or causing movement of either a vehicle or a load receiving or relinquishing structure for an alignment purposeExaminersPrimary: Herrmann, Allan D.Attorney, Agent or FirmForeign Patent References
International ClassesB60T 003/00B65G 067/02 F16H 025/20 AbstractThe drive screw system comprises a drive screw and a drive nut adapted for driving a cooperating member such as a vehicle restraining device between the proximal and distal ends of the drive screw. At least one bearing assembly is mounted to a track for supporting the drive screw and automatically moving between the proximal and distal ends of the drive screw in response to the drive nut to automatically maintain a predetermined maximum unsupported length of the drive screw. Each bearing assembly comprises two bearing supports connected at a fixed length and which are coaxially disposed relative to each other. In one embodiment, the length of each bearing assembly are integral multiples of the smallest fixed connecting length and the drive screw has stationary bearing supports disposed at the proximal and distal ends wherein the distance between the stationary supports is (n+1)*L where n is the number of bearing assemblies and L is the length of the shortest bearing assembly.Other References
Field of SearchOn groundWheel cradle, chock, or well SCREW With additional means for aligning vehicle and an external load support Means comprises device or member for moving or causing movement of either a vehicle or a load receiving or relinquishing structure for an alignment purpose Means serves to align wheeled vehicle and load receiving or relinquishing structure Location of plural roller sets; more than two telescoping members | |
