Nifco Inc.

Kazuyoshi Koizumi

Ken Hayashi

Yoshihisa Takei

Norio Takahashi

Akinori Harada

Shunsuke Okabayashi

Masayuki Nishiyama

Shun Cho

A cylinder body is partitioned by a partition into a first chamber that is divided from an outside by a cap body and a second chamber accommodating a piston body. A flow channel communicating the first chamber and the second chamber with each other is formed in the partition, and a shaft is projected from the partition onto the first chamber side. The cap body includes a through-hole, the shaft is inserted movably in the through-hole from a reference position along an axis line direction of the cylinder body. There is provided a throttle structure that changes a gap between the through-hole and the shaft when the cap body moves from the reference position by a pressure change generated by a movement or a relative movement of the piston body.

Damper device

A rotary damper (D) is constituted by: housings (); a silicon oil () being housed inside the housings (); a rotor () wherein a resistive portion () moving through the silicon oilinside the housings () is provided in an axial portion () which is housed inside the housings () and projects from the housings (); and an O-ring () preventing the silicon oil () from leaking between the axial portion () and the housing (), and multiple arc-like through-bores () are provided in the resistive portion () on a concentric circle, and depressed grooves () communicating with the arc-like through-bores () are provided. Accordingly, during the assembly, the air being mixed into the housing is not allowed to be excessively compressed, so that even if the rotor rotates bi-directionally, the noise being caused by the air being mixed into the housing can be prevented.

Rotary damper

A rotary damper includes a rotor having a shaft, a housing having an opening and forming therein a chamber for accommodating the rotor so that the rotor is rotatable while being damped, and a cap for closing the opening of the housing. The housing has an annular wall which is provided on the outer periphery thereof with a gear portion. The shaft of the rotor projects out of the cap.

A reciprocating device for a movable member includes: a stationary member; a movable member held by the stationary member in such a manner as to be able to reciprocate; a biasing device provided between the movable member and the stationary member and adapted to bias the movable member in at least one of the reciprocating directions of the movable member; and a lock device for stopping the movable member in the course of its reciprocation, the lock device including: a cam groove formed on either the stationary member or the movable member and extending around a heart-shaped island; a lock pin having a base end section rotatably supported by either the stationary member or the movable member on which the cam groove is not formed and a tip end section bent toward the bottom of the cam groove; and a pressing device for pressing the tip end section of the lock pin toward the bottom of the cam groove, the pit section of the heart-shaped island of the lock device being equipped with a tapered surface inclined toward the bottom of a stop section of the cam groove, the tip end section of the lock pin being bent at an angle corresponding to the inclination of the tapered surface of the pit section of the heart-shaped island.

Growing community of inventors

Sagamihara, Japan

Kazuyoshi Koizumi