A spring seat, in particular a spring plate for a vibration damper, in particular a vehicle vibration damper, in particular a spring plate for a level adjustment device, in particular a vehicle height adjustment device, may include a spring retaining ring with an internal cross section or an internal cross-sectional area. The spring seat may also include a spring element configured to reduce the internal cross section of the spring retaining ring. The spring element may be configured such that a reduction of the internal cross section is configured to occur in a radial direction. The spring element may further include a tensioning element configured to adjust a spring tension of the spring element

A spring compression device comprises a spring sleeve configured to receive a spring; a spring adjustment member provided on and engaged with the spring sleeve and configured to abut a spring mounted on the spring sleeve, wherein the spring sleeve and spring adjustment member define an operating length (L) of the spring compression device, and the spring adjustment member is configured to be moved relative to the spring sleeve to adjust the operating length of the spring compression device; and at least one blocking component for blocking movement between the spring sleeve and the spring adjustment member.

A spring end cap includes a central axis, first and second parallel planar ends, and first and second circumferential surfaces. The planar ends are orthogonal to the central axis. An outer diameter of the first planar end is larger than an outer diameter of the second planar end. The first and second circumferential surfaces are disposed about the axis and between the planar ends. The first circumferential surface is disposed between the first planar end and the second circumferential surface. The first circumferential surface has a diameter smaller than a diameter of the second circumferential surface.

A damper device includes first to third rotating elements rotatable about a rotational center; a first elastic element located between the first and third rotational elements and compressed by relative rotation of the first rotational element to the third rotational element in one rotational direction; a second elastic element located between the second and third rotational elements and compressed by relative rotation of the third rotational element to the second rotational element in the one rotational direction, a support member intervenient between the third rotational element and the first elastic element to support the first elastic element; and a restrictor provided with the third rotational element to rotatably support the support member in a plane orthogonal to the rotational center, to restrict the support member from rotating beyond a certain angle and from moving away from the third rotational element in rotational directions.

A damper device includes first to third rotating elements rotatable about a rotational center; a first elastic element located between the first and third rotational elements and compressed by relative rotation of the first rotational element to the third rotational element in one rotational direction; a second elastic element located between the second and third rotational elements and compressed by relative rotation of the third rotational element to the second rotational element in the one rotational direction, a support member intervenient between the third rotational element and the first elastic element to support the first elastic element; and a restrictor provided with the third rotational element to rotatably support the support member in a plane orthogonal to the rotational center, to restrict the support member from rotating beyond a certain angle and from moving away from the third rotational element in rotational directions.

A coil spring device includes: a main body spring and an insulator, the insulator is provided with a support groove which extends around a coil axis and into which a lower end portion of the main body spring is fitted, the lower end portion of the main body spring adheres to an inner surface of the support groove, the inner surface of the support groove is provided with a plurality of spacer protrusions which support an outer peripheral surface of a wire rod, a plurality of adjacent spacer protrusions adjacent to an open end edge of the support groove of the plurality of spacer protrusions each includes a pair of side wall surfaces extending toward the open end edge and are provided at intervals therebetween in an extension direction of the open end edge in a plan view of a part including the open end edge in the inner surface of the support groove, and inclination angles of the side wall surfaces adjacent to each other in the extension direction with the interval therebetween with respect to an orthogonal direction orthogonal to the open end edge are different from each other in the plan view.

An extension spring assembly and a method for manufacturing the same. A helical extension spring is provided. The spring has a plurality of coils disposed along a longitudinal axis between an end coil at a first end and an end coil at a second end with the coils touching each other in absence of a force acting on the extension spring that is sufficient for extending the same. The end coils are gripped and the spring is extended to an extended position. In the extended position the spring has a predetermined distance between successive coils thereof In the extended position a coating material is disposed onto the surface of the spring such that the coating material is disposed onto a surface portion of the spring where the coils touch each other in absence of extension. The coating material is cured for a predetermined time interval while the spring is extended. The extension is removed from the spring after elapse of the predetermined time interval and the end coils are released. End mounts are then inserted into a first and a second end portion of the spring.

A coil spring jig includes a spring support portion where one end of a coil spring is capable of being placed, a plurality of displacement regulating portions extending along an axis of the coil spring from the spring support portion with the coil spring supported by the spring support portion as a reference, capable of abutting against an outer peripheral surface of the coil spring, and regulating displacement of the coil spring in a radial direction of the coil spring, and a lid portion supported by the displacement regulating portions and capable of keeping the coil spring in a compressed state by sandwiching the coil spring together with the spring support portion.

A shock absorber, including: a first cylindrical body; a second cylindrical body surrounding an outer peripheral surface of the first cylindrical body and provided movably in a direction of an axis of the first cylindrical body with respect to the first cylindrical body; a spring provided between the outer peripheral surface of the first cylindrical body and an inner peripheral surface of the second cylindrical body and applying a force in a direction of separating the first cylindrical body and the second cylindrical body; and a spring seat portion that is a cylindrical body provided between the outer peripheral surface of the first cylindrical body and the inner peripheral surface of the second cylindrical body and supporting an end portion of the spring in the axis direction, the spring seat portion being made of resin and being arranged movably in a direction intersecting the axis direction.

A coil spring is disposed in a fluid passage between a cylindrical body and a valve element to urge the valve element toward a closed position. The coil spring comprises a valve support portion supporting the valve element, a secured portion secured to an inner peripheral surface of the fluid passage, an expanding-contracting portion extending from the secured portion, and a connecting portion between the expanding-contracting portion and the valve support portion. The connecting portion comprises a first portion curved so as to pass radially outward of an end winding portion of the expanding-contracting portion, a second portion passing through the center of the valve support portion, a third portion extending curvedly so as to overlap the first portion, and a fourth portion extending to the valve support portion. When the coil spring is compressed, the valve support portion is supported to the expanding-contracting portion 54 through the connecting portion.