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21494results about "Large fixed members" patented technology

Workbench with multiple degrees of freedom

The invention relates to a workbench with multiple degrees of freedom, which can move and rotate in multiple directions and is beneficial to overcoming of the disadvantage that the workbench in the prior art is of a fixed structure and can not move. The workbench comprises an elevator mechanism, a moving mechanism on a horizontal plane and a multi-angle rotating mechanism, wherein the elevator mechanism and the moving mechanism are of a lead screw moving mechanism, and the multi-angle rotating mechanism comprises a universal connection device and a locking mechanism. The moving mechanism can drive the workbench to move on the horizontal plane and ensure that the workbench can reach any positions on the horizontal plane within an effective range, and an X-directional moving mechanism and a Y-directional moving mechanism can operate independently or in a combined manner; the multi-angle rotating mechanism drives the surface of the workbench to incline; and the mechanisms are mutually combined to complete position change of the workbench surface.
Owner:许晓华

System for supporting and servicing a gas turbine engine

A power system includes a gas turbine engine, which may include a gear box. The gear box may include a pipe connection configured to receive a removable pipe. The power system may also include a moveable support configured to fasten to the pipe connection to at least partially support the gear box.
Owner:SOLAR TURBINES

Decision-theoretic web-crawling and predicting web-page change

Systems and methods are described that facilitate predictive web-crawling in a computer environment. Aspects of the invention provide for predictive, utility-based, and decision theoretic probability assessments of changes in subsets of web pages, enhancing web-crawling ability and ensuring that web page information is maintained in a fresh state. Additionally, the invention facilitates selective crawling of pages with a high probability of change.
Owner:MICROSOFT TECH LICENSING LLC

Machine Tool

Machine tool simplifying maintenance, reducing manufacturing costs, and enabling high precision machining. The machine tool is equipped with: a bed furnished with a rectangular base, right and left sidewalls provided standing either side of the base, and a rear sidewall provided standing along the back of the base; a table disposed in the space surrounded by the three sidewalls; a first saddle shaped in the form of a rectangular frame shape, provided free to shift back and forth supported on the tops of the left and right sidewalls; a second saddle penetrated by a perpendicular through-hole and arranged free to shift sideways inside the first saddle frame; and a spindle head arranged free to shift perpendicularly inside the through-hole in the second saddle; and a main spindle arranged over the table and supported by the spindle head free to rotate centered on its axis.
Owner:DMG MORI SEIKI CO LTD

Positioning device having two object holders

A positioning device has first and second object holders that are guided over a guiding surface extending parallel to an X-direction and parallel to a Y-direction perpendicular to the X-direction and which are displaceable over the guiding surface from a first position into a second position by means of a displacement system. The displacement system includes a first displacement unit and a second displacement unit to which the object holders can be alternately coupled. The first displacement unit is suitable for carrying out a first series of positioning steps of the first object holder in the first position and for displacing the first object holder from the first position into an intermediate position between the first and second positions. The second displacement unit is suitable for carrying out a second series of positioning steps of the second object holder in the second position, simultaneously with and independently of the first displacement unit, and for displacing the second object holder from the second position into the intermediate position. In the intermediate position, the object holders are exchanged, after which the first series of positioning steps can be carried out by the first displacement unit with the second object holder in the first position and the second series of positioning steps can be carried out by the second displacement unit with the first object holder in the second position. The positioning device is suitable for use in a lithographic device to carry out an exposure process with a first semiconductor substrate in an exposure position and, simultaneously therewith and independently thereof, a characterization process with a second semiconductor substrate in a characterization position.
Owner:ASML NETHERLANDS BV
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