What is claimed is:
1. A wireless application server system comprising digital data stored on one or more storage media, the data further comprising:
an application server program configured to be downloaded to one or more remote wireless application server computers and to execute on the one or more remote wireless application server computers, the application server program being further configured to cause the one or more remote application server computers to download and to install one or more wireless application software components on the one or more remote wireless application server computer;
the one or more wireless application server programs being configured to transmit to one or more portable devices one or more client applications and to cause the one or more portable devices to install the one or more client applications;
the client applications being configured to communicate with the local wireless application server computer over a wireless network.
2. The wireless application server system of claim 1, further comprising a license server configured to update a database of license information in response to execution of the wireless application software and to cause notifications of charges to be generated based on the license information.
3. The wireless application server system of claim 1, further comprising a central application server configured to transmit the application server program and the one or more wireless application software to the one or more local wireless application server computers.
4. The wireless application server system of claim 1, wherein the application server program is further configured to download and to install a different set of wireless application server on different local wireless application server computers.
5. The wireless application server system of claim 1, wherein the data further comprises application data resulting from execution of the wireless server applications.
6. The wireless application server system of claim 5, wherein the application data is processed and filtered by the one or more local application server computers before transmitting the pre-processed and filtered data to the central application server.
7. The wireless application server system of claim 1, wherein the application server program is further configured to cause the one or more local application server computers to update one or more wireless application software programs on the one or more local wireless application server computers.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A linear actuator comprising:
a guide rail provided with ball-rolling grooves extending in a major axis direction on both side surfaces and formed with a concave groove having a substantially U-shaped cross section;
a ball screw shaft arranged substantially in parallel to said ball-rolling grooves at a central portion in a widthwise direction substantially perpendicular to said major axis direction of said guide rail;
bearings for supporting said ball screw shaft at both ends in said major axis direction of said guide rail;
a slider formed with endless circulating passages including ball-rolling grooves opposed to said ball-rolling grooves of said guide rail so that said guide rail faces an interior of a recess;
a ball screw nut installed to a recess of said slider, for making engagement with said ball screw shaft; and
a screw guide member for movably supporting said ball screw nut, said linear actuator further comprising:
a floating mechanism for absorbing fine movement of said ball screw nut in a direction substantially perpendicular to a displacement direction on a substantially horizontal plane, and fine movement of said ball screw nut in a substantially vertical direction respectively.
2. The linear actuator according to claim 1, wherein said floating mechanism includes a mobile connected to said screw guide member for movably supporting said ball screw nut in said substantially vertical direction, and a hole for allowing said mobile to make engagement with said slider.
3. The linear actuator according to claim 2, wherein a pair of said mobiles are provided in a substantially horizontal direction substantially perpendicular to an axis of said ball screw shaft with said ball screw nut intervening therebetween.
4. The linear actuator according to claim 2, wherein a pair of said mobiles are provided in a substantially vertical direction substantially perpendicular to an axis of said ball screw shaft with said ball screw nut intervening therebetween.
5. The linear actuator according to claim 2, wherein said hole for making engagement with said slider is a slotted hole.
6. The linear actuator according to claim 1, wherein a lubricating member is installed to said slider by the aid of a cover member.
7. The linear actuator according to claim 1, wherein said screw guide member is formed with a pair of substantially parallel opening surfaces separated from each other by a predetermined spacing distance, and said ball screw nut is formed with a pair of substantially parallel surfaces for making sliding movement along said pair of opening surfaces.