A flexure bearing having a first sleeve and a second sleeve is provided. Each sleeve includes a first pillar having a first end attached to the sleeve and a second end projecting outwardly from the sleeve and a second pillar having a first end attached to the sleeve and a second end projecting outwardly from the sleeve parallel to and diametrically opposed to the first pillar. The flexure bearing has a plurality of blind holes and a plurality of compression springs, each compression spring having a first spring end fit into one of the blind holes of a pillar of the first sleeve and a second spring end fit into a corresponding blind hole of an adjacent pillar of the second sleeve when the second sleeve is interconnected to the first sleeve.

An apparatus includes an integral, additively manufactured, actuation device having a rigid portion comprising a shaped structural member and a flexible portion comprising a helical torsion spring. In a spacecraft application, a spacecraft appendage may be coupled with a deployment mechanism, the deployment mechanism including at least one integral, additively manufactured, actuation device having a rigid portion comprising a shaped structural member and a flexible portion comprising a helical torsion spring.

A self-rightening riser base self-rightens a riser coupled thereto when knocked from a desired orientation by an object. A riser coupler aperture in the riser base is oversized to allow the riser to move and deflect. A floating flange is configured an offset distance under the cap and is attached to the cap by spring bolts that extend down through the cap to the floating flange. The riser is coupled to the floating flange by a riser coupler. The spring bolt apertures in the cap are oversized to allow the spring bolts to move therein and therefore allow the floating flange and riser coupled thereto to deflect. An electrical fixture may extend through the riser coupler and through a conduit in the riser to an electrical fixture, such as a light. A grommet may be configured in the riser coupler aperture of the cap and prevent water from passing therethrough.

An attachment structure for an urging member includes an attachment member and a ring-like bushing. The attachment member has an insertion hole. The bushing is press-fitted in the insertion hole. The urging member includes an attached portion inserted in an inner side of the bushing. The bushing has a first portion arranged in the insertion hole and a second portion located outside the insertion hole. An inner diameter of the first portion is smaller than an inner diameter of the second portion.

A twistable and stackable shelf includes storage members, an elastic member, a first supporting pipe, a second supporting pipe, a first connecting member, and a second connecting member. Each of the first and second connecting member includes an end portion defining an inserting hole and an inserting portion defining a bottom groove and fluidly connected to the inserting hole. Two ends of the elastic member are inserted into the inserting holes and extend to the bottom grooves; two hooking members are arranged in the bottom grooves. The first and second supporting pipes form a vertical arrangement through the first and second connecting members and support the plurality of the storage members in a vertical direction. Or, the first and second supporting pipes form a horizontal arrangement through the first and second connecting members, and the storage members are twisted and stacked in the vertical direction.