Some options for the 2T base

This basic prototype at Cambridge shows the carcass/shell mounted on the base with a tilt hinge at the level of the fulcrum.   The base is a standard 5 star.   Greater stability when reclined would be improved if the back 2 legs were extended.   This suggests that the rotation of 360° would need to be reduced to about 60° in the anterior direction.

The post Hospital beds shows a number of beds each with a base of great complexity.

    Ankit

The Ankit model has a simpler base.  It is possible to incorporate a hinge mechanism onto this sort of 4 wheel base to support the functional carcass.    

• For this
• The hinge would be at the apex of the base.
• The hinge could be mounted at the fulcrum
• or at the front edge of the seat-pan.
• Damping is required to avoid a jolt at the end of range.
• The base can be narrower or wider than the carcass.
• The latter is more stable.
• Consider :-
  • The mounting of the arm-rests, if any.
  • A shelf, shelves.
  • side restraints for a hospital bed.

• See Hospital-applications/→
• Hospital beds→

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