Mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner

1. A mechanical system for operating the back bottom and knee bottom sections of a bed or the like in an interlocked manner by the same power source, comprising a back lifting mechanism and a knee lifting mechanism connected with each other by an interlocking means, to ensure that they can be operated by the same power source in such an interlocked manner that, halfway in the operation for inclining said back bottom section, said knee bottom section reaches the largest inclination angle, and that, before said back bottom section halfway in action for inclination reaches the largest inclination, said knee bottom section returns to lie flat.

2. A mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 1 , wherein said back lifting mechanism has a back lifting link that receives power from a drive source for inclining the back bottom section; said knee lifting mechanism has a knee lifting link that receives power from the drive source through said interlocking means for inclining the knee bottom section; and said knee lifting link is inclined at an angle larger than that of said back lifting link in a state where the entire bottom lies flat.

3. A mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 2 , wherein the bottom of the bed or the like is divided into a back bottom section corresponding to the back of a lying person, a waist bottom section corresponding to his/her waist, a knee bottom section corresponding to the region from his/her waist to knees, and a leg bottom section corresponding to his/her legs; bendable bottom sections respectively bendable at an adequate curvature are installed between said back bottom section and said waist bottom section and between said knee bottom section and said leg bottom section; and said back lifting link is kept in contact with the reverse face of said back bottom section, while said knee lifting link is kept in contact with the reverse face of the bendable bottom section installed between the knee bottom section and the leg bottom section.

4. The mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 3 , wherein the inclination angle of said knee lifting link can be adjusted, to ensure that the interlocked relation between said back lifting mechanism and said knee lifting mechanism can be adjusted.

5. The mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 3 , wherein the length of said knee lifting mechanism can be adjusted, to ensure that the angle for achieving the highest knee position can be adjusted.

6. The mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 2 , wherein the inclination angle of said knee lifting link can be adjusted, to ensure that the interlocked relation between said back lifting mechanism and said knee lifting mechanism can be adjusted.

7. The mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 6 , wherein the length of said knee lifting mechanism can be adjusted, to ensure that the angle for achieving the highest knee position can be adjusted.

8. The mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 2 , wherein the length of said knee lifting mechanism can be adjusted, to ensure that the angle for achieving the highest knee position can be adjusted.

9. The mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 2 , wherein said interlocking means is composed of a rod adjustable in length, to ensure that the interlocked relation between said back lifting mechanism and said knee lifting mechanism can be adjusted.

10. The mechanical system for operating the back and knee bottom sections of a bed or the like in an interlocked manner, according to claim 1 , wherein said interlocking means is composed of a rod adjustable in length, to ensure that the interlocked relation between said back lifting mechanism and said knee lifting mechanism can be adjusted.