Bed combination method, bed separation method and bed

A bed combination method of combining a chair base portion of a wheelchair with a bed base portion of a bed main portion so as to form a bed,

• the method comprising:
• at a combining preparation position in a vicinity of the bed base portion of the bed main portion, causing a seat portion of the wheelchair to perform a tilt action with respect to the chair base portion in a state where the seat portion is in a chair posture with respect to the chair base portion, and changing a posture of the seat portion to a tilt posture where the seat portion is inclined in such a manner that a position of a footrest composing the seat portion of the wheelchair is higher than the bed base portion of the bed main portion;
• after the wheelchair is combined with the bed base portion by moving the wheelchair in the tilt posture into a recess part of the bed base portion,
• starting a tilt action of the seat portion with respect to the chair base portion after a reclining angle of a chair back bottom member decreased by pivoting the chair back bottom member with respect to the chair base portion becomes a predetermined angle;
• and
• changing the posture of the seat portion of the wheelchair from the tilt posture by the tilt action in a state where the reclining angle of the chair back bottom member is maintained to be constant, and at same time, changing the posture of the seat portion from the chair posture to a flat posture.

A bed separation method of separating a wheelchair from a bed formed by combining a chair base portion of the wheelchair with a recess part of a bed base portion of a bed main portion,

• the method comprising:
• changing a posture of a seat portion of the wheelchair stored in the recess part of the bed base portion of the bed main portion from a flat posture and a non-tilt posture to a tilt posture where a position of a footrest is higher than the bed base portion in a state of a chair posture;
• before the wheelchair is separated from the bed base portion by moving the wheelchair in the tilt posture from the recess part of the bed base portion,
• starting a tilt action of the seat portion with respect to the chair base portion after a reclining angle of a chair back bottom member increased by pivoting the chair back bottom member with respect to the chair base portion becomes a predetermined angle;
• and
• changing the posture of the seat portion of the wheelchair to the tilt posture by the tilt action in a state where the reclining angle of the chair back bottom member is maintained to be constant, and at same time, changing the posture of the seat portion from the flat posture to the chair posture.