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:
Feb. 27, 2024
Filed:
Feb. 17, 2020
Smc Corporation, Chiyoda-ku, JP;
Shinji Miyazoe, Moriya, JP;
Kazuhiro Noguchi, Tsukubamirai, JP;
SMC CORPORATION, Chiyoda-ku, JP;
Abstract
In a spool-type switching valve in which a recessed groove in which a packing is mounted is provided at a land portion of a spool, a groove bottom of the recessed groove is formed of an inclined surface that has an axial length half or larger than the length of the groove bottom in the direction of an axis and that continuously decreases in diameter from an upstream end to a downstream end, the inner periphery of the packing is brought into pressure-contact with the groove bottom with stress concentration at a pressure contact point that defines an upstream end of the inclined surface, and an angle θ that a connection surface connecting the pressure contact point on the groove bottom and the upstream end forms with the axis is within the range of 0°≤θ≤α, where α is an angle that the inclined surface forms with the axis.