The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 2001
Filed:
Oct. 21, 1998
Satoshi Suzuki, Ibaraki-ken, JP;
Mitsuhiro Someya, Ibaraki-ken, JP;
Shinichi Homma, Ibaraki-ken, JP;
Katsumi Iijima, Ibaraki-ken, JP;
SMC Kabushiki Kaisha, Tokyo, JP;
Abstract
A rodless cylinder comprises a cylinder tube and guide shafts which are arranged in parallel to one another. The cylinder tube comprises a piston therein which is displaceable in the axial direction. Driving magnets are provided on outer circumference of the piston. A slider, which is displaceable in the axial direction, is provided on the guide shafts. The slider is supported on the guide shafts by the aid of ball bushes. Driven magnets, which correspond to the driving magnets, are provided in a hole of the slider. Inner circumferential surfaces of the driven magnets are slightly separated from an outer circumferential surface of the cylinder tube. Accordingly, it is unnecessary to apply any surface treatment to the cylinder tube, and it is possible to avoid appearance of dust or the like. It is unnecessary to assemble the rodless cylinder with a high degree of accuracy, and thus the production cost can be reduced.