Adjustable beds

Claim 2

A bed comprising, a frame, a supporting part having at least three adjacent sections consisting of a back-supporting section, a seat section and a thigh-supporting section, each of the three sections is pivotally connected to the adjacent section and is supported by lever means to the frame, the said lever means comprises a two-arm lever pivoted about an axle adapteD to be pivotally supported on one side of said axle, coupling members connecting the back-supporting section and seat section to the said two-arm lever on each side of said axle, a second lever pivotally connected by a coupling rod to the said seat section, said second lever being fixed on a pivoting axle, said pivoting axle carrying a connecting lever articulated by a rod to the axle of the two-arm lever, a second lever means pivotally connected to the thigh-supporting section and means for locking said sections in selected positions, whereby the back-supporting section and the seat section are angularly adjustable while the seat section is held at a substantially constant angle.

Claim 3

A bed as recited in claim 1, wherein the two-arm lever entirely supports the back-supporting section, hinge means connecting the back-supporting section to the seat section, the said seat section is pivotally connected to one end of two-arm lever the other end of two-arm lever being pivotally connected to the said back-supporting section.

Claim 4

A bed as recited in claim 2, in which the hinges are provided with roller bearings.

Claim 5

A bed as recited in claim 1, wherein the axle of the two-arm lever is adapted to be located behind the center of gravity of a human body when the latter is horizontally stretched over the supporting parts, wherein when the locking means is released, the angular relative position of the three sections remains substantially unchanged due to the fact that all the sections of the supporting part are exclusively supported by lever means.

Claim 6

A bed as cited in claim 1, wherein the locking means is articulated on one side to a reversing lever connected to the second lever of the seat section and on the other side to the frame.

Claim 7

A bed as recited in claim 1, wherein the levers are pivotally mounted on the frame, the said frame being pivotally mounted on a main frame, and blocking means for angularly locking the said frame relative to the said main frame.

Claim 8

A bed as recited in claim 1, wherein the frame is provided with wheels and adjustable legs, the said legs being spring actuated so as to be adaptable to various heights of the ground.

Claim 9

A bed comprising a frame, a supporting part having at least three adjacent sections consisting of a back-supporting section, a seat section and a thigh-supporting section, each of the said three sections is pivotally connected to the adjacent section and is supported by lever means to the frame, the said lever means comprises a two-arm lever pivotable about an axle adapted to be pivotally supported on one side of said axle, coupling members connecting the back-supporting section and a seat section to the said two-arm lever on each side of said axle, a second lever articulated at one end directly to the thigh-supporting section and at the other end to the frame, a rod articulated at one end directly on the back-supporting section and at the other end to the frame the said second lever also carrying the pivoting axle of the said two-arm lever, a second lever means pivotally connected at one end to the tigh-supporting section and at the other end to the frame, means for releasably locking the said section in selected positions, whereby the back-supporting section and the seat section are angularly adjustable while said seat is held at a substantially constant angle.

Claim 10

A bed comprising a frame, a supporting part having at least three adjacent sections consisting of a back-supporting section, a seat section and a thigh-supporting section, each of the said three sections is pivotally connected to the adjacent section and is supported by lever means to the frame, the said lever means comprises a two-arm lever pivotable about an axle adapted to be pivotally supported on one side of said axle, coupling members connecting the back-supporting section and a seat section to the said two-arm lever on each side of said axle, a second lever articulated at one end directly to the thigh-supporting section and at the other end to the frame, a rod articulated at one end directly on the back-supporting section and at the other end to the frame the said second lever also carrying the pivoting axle of the said two-arm lever, a second lever means pivotally connected at one end to the tigh-supporting section and at the other end to the frame, means for releasably locking the said section in selected positions, whereby the back-supporting section and the seat section are angularly adjustable while said seat is held at a substantially constant angle.

Claim 11

A bed as cited in claim 8, wherein the locking means is articulated on one side to one end of the two-arm lever and on the other side to the frame.

Claim 12

A bed according to claim 9, wherein the locking means comprises a threaded rod articulated at one end to the frame and at the other end guided in a perforated support whose other end is articulated to the two-arm lever, the said support being provided with at least a threaded piston which surrounds approximately half the circumference of the threaded rod so as to enable the displacement of the said support along said threaded rod during the angular displacement of the said sections and means for disengaging said Piston on the threaded rod so as to lock the sections in selected positions.

Claim 13

A bed as recited in claim 10, comprising a motor articulated to the frame is connected to the threaded rod, whereby the displacement of the support of the threaded piston is obtained by the rotation of the threaded rod by the motor or by releasing the threaded piston from the threaded rod.

Claim 14

A bed as recited in claim 10, wherein the threaded piston is controlled by a blocking mechanism, the said mechanism comprising a rod member articulated to the threaded piston wherein said threaded piston has an inclination to prevent movement of the threaded piston.

Claim 15

A bed as recited in claim 12, wherein the blocking mechanism of the threaded piston is controlled by cable means adapted to be operated by the person lying in the bed, wherein the cable means comprises a cable adapted to release the threaded piston, and spring means for automatically blocking the said threaded piston.