Reciprocation device and crib

A reciprocation device comprising a width in a first Cartesian dimension (Y) and a length in a second Cartesian dimension (Z), the reciprocating device comprising:

• a single continuous membrane, which is a sheet-like member, configured to support at least one being and arranged to extend along an entirety of the first Cartesian dimension (Y) and along a majority of the second Cartesian dimension (Z) to continuously cover an area and comprising a thickness in the third Cartesian dimension (X),
• a tensioning mechanism attached to the membrane and configured to repeatedly adjust the tension of the membrane in at least either first or second Cartesian dimension (Y, Z) to repeatedly adjust a sag of the membrane in the third Cartesian dimension (X) for repeatedly reciprocating the at least one being supported by the membrane, wherein the reciprocation device is constructed as a retro-fit module, which is dimensioned to replace or be placed under the mattress of a crib,
• a first transversal body part connecting a first and second longitudinal body part at one end of the reciprocation device,
• a second transversal body part connecting the first and second longitudinal body part at another end of the reciprocation device, and
• a cover comprising a fabric and configured and arranged to cover a frame of the reciprocation device, said cover comprising an opening for the membrane, and wherein the membrane is configured to be integrated to the cover and arranged to be exposed by the opening in the cover.

A reciprocation device comprising a width in a first Cartesian dimension (Y) and a length in a second Cartesian dimension (Z), the reciprocating device comprising:

• a single continuous membrane, which is a sheet-like member, configured to support at least one being and arranged to extend along an entirety of the first Cartesian dimension (Y) and along a majority of the second Cartesian dimension (Z) to continuously cover an area and comprising a thickness in the third Cartesian dimension (X),
• a tensioning mechanism attached to the membrane and configured to repeatedly adjust the tension of the membrane in at least either first or second Cartesian dimension (Y, Z) to repeatedly adjust a sag of the membrane in the third Cartesian dimension (X) for repeatedly reciprocating the at least one being supported by the membrane, wherein the reciprocation device is constructed as a retro-fit module, which is dimensioned to replace or be placed under the mattress of a crib,
• a first transversal body part connecting a first and second longitudinal body part at one end of the reciprocation device,
• a second transversal body part connecting the first and second longitudinal body part at another end of the reciprocation device,
• a cover comprising a fabric and configured and arranged to cover a frame of the reciprocation device, said cover comprising an opening for the membrane, and wherein the membrane is configured to be integrated to the cover and arranged to be exposed by the opening in the cover, and
• wherein the first and second transversal body part as well as the first and second longitudinal body part form the frame of the reciprocation device for acting as a mounting point for accessories including a drive.