Seismic isolation system for a crane
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsYoshiaki Okubo, Hiroshi Ikeda, Hideaki Harada
Life of this patent
Estimating the term…
Abstract
A seismic isolation system is provided with a swing bearing ring consisting of an upper ring and a lower ring, which are rotatable relatively, between a crane body and a traveling means. A lower vertical shaft of a block pivotally supported on saddles of the crane body is supported by a swing bearing provided at an eccentric position on the upper ring. An automatic restoring mechanism is provided which restores the swing of a horizontal lever, whose proximal end is installed to the upper ring of the swing bearing ring, around the centerline C2.
Claims43
A seismic isolation system for a crane adapted to be provided between a crane body and a movable support having a plurality of wheels for moving said crane body along a rail, comprising:
- a bearing structure adapted to be connected between said crane body and said movable support and adapted to allow relative movement of said crane body and said movable support while maintaining said crane body and said movable support in a connected relationship when said crane is subjected to seismic force;
- a seismic force responsive releasable connector adapted to maintain a predetermined fixed positional relationship between said crane body and said movable support when said connector is in a connected state and allowing a relative movement of said crane body and said movable support when said connector is released in response to a seismic force;
- an energy absorbing damper adapted to be operatively associated with said crane body and said movable support and being adapted to restrain an increase in relative movement of said crane body and said movable support when said crane is subjected to seismic force;
- and
- a restoring positioner adapted to be connected between said crane body and said movable support and adapted to restore the positional relationship between said crane body and said movable support to said predetermined fixed relationship.
A seismic isolation system for a crane, adapted to be provided between a crane body and a movable support having a plurality of wheels for moving said crane body along a rail comprising:
- a pivot bearing ring comprising a lower ring adapted to be fixedly connected in a horizontal orientation to said movable support, and an upper ring concentrically engaged with said lower ring to allow relative rotation with respect to said lower ring, and further comprising a vertical shaft supporting pivot bearing support connected to said upper ring at an eccentric position thereon;
- a crane load supporting block having a vertical shaft pivotably supported by said pivot bearing support;
- saddles adapted to be connected to a lower part of said crane body and pivotably supporting said block for rotation about a horizontal transverse shaft;
- a horizontal lever, having a proximal end pivotably supported on the upper ring of said pivot bearing ring by said horizontal transverse shaft;
- and
- a lever restoring positioner adapted to restore said horizontal lever to a predetermined neutral position from a moved position and supporting the distal end of said horizontal lever for rotation around a vertical center line of said pivot bearing ring.
A seismic isolation system for a crane, adapted to be provided between a crane body and a movable support having a plurality of wheels for moving said crane body along a rail, comprising:
- a laminated rubber bearing adapted to be mounted between a lower face of said crane body and a central portion of said movable support;
- and
- first and second transverse supports adapted to be mounted between the lower face of said crane body and an upper face of said movable support at longitudinally symmetrical positions, respectively, with respect to said laminated rubber bearing, said transverse supports being constructed and adapted to allow relative transverse movement between said movable support and said crane body.
A seismic isolation system for a crane adapted to be provided between a crane body and a movable support having a plurality of wheels for moving said crane body along a rail, and comprising:
- a universal joint bearing adapted to be connected between a lower portion of said crane body and an upper center portion of said movable support;
- and
- first and second vibration dampers adapted to be operatively connected between said crane body and said movable support, said first and second vibration dampers being positioned on opposing sides of said universal joint bearing.
A seismic isolation system for a crane adapted to be provided between a crane body and a movable support having a plurality of wheels for moving said crane body along a rail, comprising:
- a laminated rubber bearing adapted to be mounted between a lower face of said crane body and a central portion of said movable support;
- and
- first and second turnover restraining members each of said members being adapted to be coupled between the lower face of said crane body and an upper face of said movable support and said members being positioned on opposing sides of said laminated rubber bearing.
A seismic isolation system for a crane adapted to be provided between a crane body and a movable support having a plurality of wheels for moving said crane along a rail, comprising:
- a first pivot bearing ring consisting of a lower ring mounted on said movable support in an inclined position with respect thereto and an upper ring engaging concentrically with said lower ring so as to be rotatable with respect thereto;
- an inclined beam integrally connected with said upper ring of said first pivot bearing ring;
- a second pivot bearing ring consisting of a lower ring mounted on an upper face of said inclined beam at a position such that the rotational center line thereof is horizontal spaced from the rotation center line of said first pivot bearing ring, and an upper ring engaging concentrically with said lower ring so as to be rotatable with respect thereto;
- and
- a crane body connecting assembly connected between said upper ring of said second pivot bearing ring and a lower portion of said crane body.
A seismic isolation system for a crane adapted to be provided between a crane body and a movable support having a plurality of wheels for moving said crane body along a rail, comprising:
- a spring damper adapted to be connected between said crane body and said movable support and adapted to elastically maintain a predetermined positional relationship between said crane body and said movable support;
- and
- a connecting assembly adapted to be connected between said crane body and said movable support comprising a first pivot bearing ring including a lower ring adapted to be mounted horizontally on said movable support and an upper ring engaging concentrically with said lower ring so as to be rotatable with respect thereto, a horizontal beam integrally connected with said upper ring of said first pivot bearing ring, a second pivot bearing ring comprising a lower ring mounted on an upper face of said horizontal beam and being positioned to have a rotational center line at a position spaced horizontally from the rotational center line of said first pivot bearing ring, said second pivot bearing ring additionally including an upper ring engaging concentrically with said lower ring of said second pivot bearing ring so as to be rotatable with respect thereto, and a crane body connecting assembly adapted to be connected between the upper ring of said second pivot bearing ring and a lower portion of said crane body.
Dependencies are inferred from the claim text.