A coil spring includes a wire shaped to be helical, and is compressed between an upper spring seat and a lower spring seat. The coil spring includes an upper portion and a lower portion. A positive pitch winding end portion is formed on the upper portion of the coil spring. A terminal-point-strong-abutting-portion is formed at a distal end of the winding end portion. The terminal-point-strong-abutting-portion is in contact with the upper spring seat at one point at a position deviated to an inner side of a vehicle with respect to a coil central axis. On the lower portion of the coil spring, an end turn portion which contacts the lower spring seat is formed.

Spring rings and closed wire loops each can have two ends that are connected. The connected ends can be welded. The connected ends can be aligned for welding by incorporating complementary surfaces so that when joined, the tip at the first end mate to the tip at the second end. The mating can be self-aligning spatially and radially. The spring rings and the closed wire loops can be used in many applications, including in connector applications and seal applications.

A multilayer wind spring for a display support and a lifting support thereof, the multilayer wind spring is formed by winding a plurality of tightly attached elastic metal sheets, wherein each of the elastic metal sheets comprises a stretching connection portion, a movable sheet portion and an unmovable wound portion, part or all of the elastic metal sheets are provided with a semi-restricted structure which is provided to have a movement allowance in an unwinding or winding direction of the elastic metal sheets, and in an unwinding or winding process of the multilayer wind spring, the stretching connection portion of the elastic metal sheets provided with the semi-restricted structure is arranged to be slidable within a range of the movement allowance relative to a connected component.

A torsion coil spring supporting structure includes a first supporting portion opposing one end of a torsion coil spring with respect to an axial direction of the torsion coil spring; and a second supporting portion opposing the other end of the torsion coil spring with respect to the axial direction. The first supporting portion includes a spring supporting portion cooperative with the second supporting portion to support the torsion coil spring at a mounting position. The first supporting portion is elastically deformable, by moving the torsion coil spring, to permit the torsion coil to move to the mounting position in a direction crossing the axial direction and elastically restorable to place the spring supporting portion in an inner diameter portion of the torsion coil spring, thus supporting the torsion coil spring at the mounting position.

The invention relates to a fuel injector for a turbine engine, comprising a body having a fuel inlet opening into an upstream chamber and a fuel outlet connected to a downstream chamber, a metering valve being mounted between the upstream chamber and the downstream chamber, said valve being subjected to the action of an elastic return spring tending to return the valve to a closed position, the spring (11) and the valve being designed to allow the opening of the valve and to allow the passage of fuel from the upstream chamber to the downstream chamber, above a given fuel pressure in the upstream chamber, the return spring (11) extending along the axis (X) of movement of the valve, characterized in that the spring (11) has a first axial end and a second axial end, both annular, connected to one another by at least two helical parts (11c, 11d) elastically deformable in the axial direction (X).

Various embodiments include a check valve for a high-pressure component in a fuel injection system comprising: a valve housing with a valve hole having an inner diameter; a valve seat and a sealing element arranged in the valve hole; and a coil spring pushing the sealing element toward the valve seat along a longitudinal axis of the valve hole. The coil spring includes a plurality of coil turns each having an outer diameter. In a non-assembled state of the check valve, the outer diameter of at least one of the coil turns is greater than the inner diameter of at least a portion of the valve hole, so that in an assembled state of the check valve, the coil spring is secured in a force-fitting manner in the valve hole.

A multilayer wind spring for a display support and a lifting support thereof, the multilayer wind spring is formed by winding a plurality of tightly attached elastic metal sheets, wherein each of the elastic metal sheets comprises a stretching connection portion, a movable sheet portion and an unmovable wound portion, part or all of the elastic metal sheets are provided with a semi-restricted structure which is provided to have a movement allowance in an unwinding or winding direction of the elastic metal sheets, and in an unwinding or winding process of the multilayer wind spring, the stretching connection portion of the elastic metal sheets provided with the semi-restricted structure is arranged to be slidable within a range of the movement allowance relative to a connected component.

A multilayer wind spring for a display support and a lifting support thereof, the multilayer wind spring is formed by tightly attaching and winding multiple elastic metal sheets, each of the elastic metal sheets comprises: a stretching connection portion which is not involved in winding and unwinding and is always kept in an initial state, a movable sheet portion which is involved in winding and unwinding, and an unmovable wound portion which is not involved in stretching and is always kept in a wound state, the stretching connection portion, the movable sheet portion, and the unmovable wound portion are formed integrally and sequentially arranged in an unwinding direction, and the elastic metal sheets of the unmovable wound portions are arranged fixedly relative to one another.

A coil spring includes a wire shaped to be helical, and is compressed between an upper spring seat and a lower spring seat. The coil spring includes an upper portion and a lower portion. A positive pitch winding end portion is formed on the upper portion of the coil spring. A terminal-point-strong-abutting-portion is formed at a distal end of the winding end portion. The terminal-point-strong-abutting-portion is in contact with the upper spring seat at one point at a position deviated to an inner side of a vehicle with respect to a coil central axis. On the lower portion of the coil spring, an end turn portion which contacts the lower spring seat is formed.

A cushion device for a foldable chair includes a buffer member and a tension spring. The buffer member includes a sleeve portion for sleeving over a side part of a rear leg, a buffer portion provided on the sleeve portion and an embedded portion provided along a side of the sleeve portion and embedded inside a side channel of the rear leg and secured thereat via a fixing element. The tension spring includes a spring body having a first hooking portion fixed a pivot plate of a seat and a second hooking portion including a second extension section, a second bent section engaging a limiting plate of a front leg and a third extension section extending from the second bent section in such a manner to prevent disengagement of the second bent section of the tension spring from a hooking hole in the limiting plate.