A sofabed which includes a first base frame serving as the seat of a sofa or the bed piece of a bed and defining a space for keeping pillows, quilts, etc., a second base frame retractably connected to the first base frame and moved between the retracted position received inside tile first base frame and the extended position to serve as the base frame of a second bed, a seat frame supported on the first base frame, a second seat frame pivoted to the first base frame and set at the desired angle to serve as the back of the sofa the bed piece of the second bed, and two armrest frames adjustably connected to the first base frame at two opposite ends.

BACKGROUND OF THE INVENTION 
The present invention relates to sofabeds, and relates more particularly to 
a simple structure of sofabed which can be alternatively arranged into a 
sofa, a single bed, or twin beds, and which has a space for keeping a 
quilt, pillow, etc. 
The frame assembly of a regular sofabed is generally comprised of a 
plurality of frame tubes and an angle adjustment device respectively 
connected together by connecting elements such as pins, screws etc. This 
structure of sofabed has no room for keeping quilt, pillow, etc. 
Furthermore, this structure of sofabed can only be alternatively arranged 
into a bed or a sofa, however it cannot be adjusted from a linked twin 
beds into a single bed. 
SUMMARY OF THE INVENTION 
The present invention overcomes the aforementioned disadvantages of 
conventional sofabeds. It is one object of the present invention to 
provide a sofabed which can be conveniently arranged into a sofa, a single 
bed, or linked twin beds. It is another object of the present invention to 
provide a sofabed which has a space for keeping a quilt, pillow, etc. It 
is still another object of the present invention to provide a sofabed 
which is simple in structure, and convenient to assemble. According to the 
preferred embodiment of the present invention, the sofabed comprises a 
first base frame serving as the seat of a sofa or the bed piece of a bed 
and defining a space for keeping pillows, quilts, etc., a second base 
frame retractably connected to the first base frame and moved between the 
retracted position received inside the first base frame and the extended 
position to serve as the base frame of a second bed, a seat frame 
supported on the first base frame, a second seat frame pivoted to the 
first base frame and set at the desired angle to serve as the back of the 
sofa or the bed piece of the second bed, and two armrest frames adjustably 
connected to the first base frame at two opposite ends.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIG. 1, the frame assembly of a sofabed in accordance with the 
present invention is generally comprised of a first base frame 10, a 
second base frame 20, a first seat frame 3, a second seat frame 5, two 
armrest frames 4, and a plurality of connectors 6, 6' The aforesaid frames 
are respectively made from metal tubes. 
Referring to FIG. 1 again, the first base frame 10 comprises an upper 
sub-frame 1 and a bottom sub-frame 2 connected in parallel. The sub-frame 
1 or 2 comprises two longitudinal frame tubes 11 or 21 disposed at two 
opposite sides in a parallel relation, two substantially U-shaped frame 
tubes 17 or 23 respectively connected between the longitudinal frame tubes 
11 or 21 at two opposite ends, arid two pairs of Tees 12 or 22 
respectively connected between the longitudinal frame tubes 11 or 21 and 
the U-shaped frame tubes 13 or 23. Two pairs of connecting tubes 7 are 
respectively connected between the longitudinal tube sections 121 of the 
tees 12 of the upper sub-frame 1 and the longitudinal tube sections 221 of 
the tees 22 of the bottom sub-frame 2 to hold the upper sub-frame 1 above 
the bottom sub-frame 2 in a parallel relation, so that a storage space is 
defined between the upper sub-frame 1 and the bottom sub-frame 2 for 
keeping a quilt, pillow, etc. The U-shaped frame tube 13 or 23 comprises a 
transverse tube section 132 or 232, and two end tube sections 131 or 231 
respectively extending from two opposite ends of the transverse tube 
section 132 or 232 at right angles and fastened to the respective Tees 12 
or 22 of the sub-frame 1 or 2. The U-shaped frame tube 13 of the upper 
sub-frame 1 comprises two short upright tube sections 133 respectively 
raised from two opposite ends of the transverse tube section 132 for 
mounting the connectors 6. Two connectors 6 are respectively fastened to 
the short upright tube sections 133 of the U-shaped frame tube 13 of the 
upper sub-frame 1 to hold the armrest frames 4, permitting the armrest 
frames 4 to be adjusted to the desired angle (for example, 30.degree., 
45.degree., . . . etc.) relative to the upper sub-frame 1. The transverse 
tube section 132 or 232 of the U-shaped frame tube 13 or 23 has one end 
closed, and an opposite end opened for mounting the second base frame 20. 
The second base frame 20 comprises an u-shaped upper sub-frame 8 and an 
u-shaped bottom sub-frame 9 connected in parallel. The diameter of the 
frame tubes of the second base frame 20 is smaller than that of the first 
base frame 10 so that the second base frame 20 can be inserted into the 
transverse frame sections 132, 232 of the U-shaped frame tubes 12, 23 of 
the first base frame 10, and moved between the retracted position as shown 
in FIGS. 3 and 4 and the extended position as shown in FIGS. 1 and 2. The 
first seat frame 3 fits over the upper sub-frame 1 of the first base frame 
10, comprising a rectangular open frame 31, a plurality of longitudinal 
frame tubes 32 connected in parallel within the rectangular open frame 31, 
and a plurality of connecting plates 33 mounted on the rectangular open 
frame 31 and fixed to the upper sub-frame 1 of the first base frame 10 to 
serve as the seat of a sofa or the bed piece of a bed. The second seat 
frame 5 comprises a rectangular open frame 51, a plurality of longitudinal 
frame tubes 52 connected in parallel within the rectangular open frame 51, 
and two substantially U-shaped frame tubes 53 retractably connected to the 
rectangular open frame 51 at two opposite ends. The rectangular open frame 
51 has one side pivotably connected to one of the longitudinal frame tubes 
11 of the upper sub-frame 1 of the first base frame 10 by connectors 6', 
which permit the second seat frame 5 to be adjusted to the desired angle 
(for example, 30.degree., 45.degree., 90.degree., etc.) relative to the 
upper sub-frame 1 of the first base frame 10. 
Referring to FIG. 3, the sofabed can be arranged into a sofa by: retracting 
the second base frame 20 into the first base frame 10, adjusting the 
connectors 6 to set the armrest frames 4 in a vertical position 
perpendicular to the upper sub-frame 1 of the first base frame 10, and 
adjusting the connectors 6' to set the second seat frame 5 in a vertical 
position perpendicular to the upper sub-frame 1 of the first base frame 
10, permitting the second seat frame 5 to serve as the back of the sofa. 
Referring to FIG. 2, the sofabed can be arranged into linked twin beds by: 
extending the second base frame 20 out of the first base frame 10 to the 
extended position, and adjusting the connectors 6' to set the second seat 
frame 5 in a horizontal position supported on the extended second base 
frame 20. The U-shaped frame tubes 53 may be extended out of the two 
opposite ends of the rectangular open frame 51 for supporting a tall 
person on the second seat frame 5. Furthermore, the armrest frames 4 may 
be adjusted to the horizontal position as desired. 
Referring to FIG. 4, the sofabed can be arranged into a single bed by: 
retracting the second base frame 20 into the first base frame 10, 
adjusting the connectors 6 to set the armrest frames 4 in a vertical 
position perpendicular to the upper sub-frame 1 of the first base frame 
10, and adjusting the connectors 6' to set the second seat frame 5 in 
horizontal position closely attached to the first seat frame 3 above the 
first base frame 10. When set, the armrest frames 4 may the adjusted to 
the horizontal position or the vertical position as desired. 
FIG. 5 shows the first base frame 10, the first seat frame 3, the second 
seat frame 5, and the two armrest frames 4 of the sofabed are respectively 
covered with a respective covering 30, and the sofabed set into a sofa. 
It is to be understood that the drawings are designed for purposes of 
illustration only, and are not intended as a definition of the limits and 
scope of the invention disclosed.