1. A rollator, comprising:
a support frame assembly;
a plurality of spaced-apart wheels mounted on a bottom portion of said support frame assembly;
a seat unit including a seat that is mounted on said support frame assembly and that has a first positioning notch formed in a top surface thereof and proximate to a front end thereof, and a second positioning notch formed in said top surface and proximate to a rear end thereof; and
a backrest unit including a backrest frame pivoted to said support frame assembly, and a positioning frame pivoted to said backrest frame, said positioning frame being engageable with a selected one of said first and second positioning notches, said backrest frame cooperating with said seat unit to define a seating space that faces rearward when said positioning frame is engaged with said first positioning notch, and cooperating with said seat unit to define a seating space that faces forward when said positioning frame is engaged with said second positioning notch,
wherein said first positioning notch is inclined rearward relative to said top surface of said seat, and said second positioning notch is inclined forward relative to said top surface of said seat; and
wherein said support frame assembly includes:
a main support frame including two spaced-apart main support rods, and two handgrips respectively connected to top ends of said main support rods;
a rear support frame including two rear support rods each pivoted to a respective one of said main support rods between top and bottom ends thereof; and
an intermediate support frame mounted between said main support frame and said rear support frame,
said wheels being mounted on bottom ends of said main support frame and said rear support rods, and said seat being mounted on said intermediate support frame.
2. The rollator as claimed in claim 1, wherein said first positioning notch is inclined rearward relative to said top surface of said seat at an angle of about 45\xb0 , and said second positioning notch is inclined forward relative to said top surface of said seat at an angle of about 45\xb0 .
3. The rollator as claimed in claim 1, wherein said seat further has a hatch.
4. The rollator as claimed in claim l, wherein said intermediate support frame includes a first frame part pivoted between said main support rods, and a second frame part pivoted between said rear support rods, said first and second frame parts and said backrest frame being pivoted to each other through a transverse axle.
5. The rollator as claimed in claim 4, wherein said first frame part includes a first support rod pivoted between said main support rods, and two spaced-apart second connection rods extending transversely from said first support rod, said second frame part including a second support rod pivoted between said rear support rods, and two spaced-apart second connection rods extending transversely from said second support rod, said transverse axle having two axle sections, a free end of each said first connection rod, a free end of each said second connection rod and a corresponding end of said backrest frame being pivoted to one of said axle sections of said transverse axle.
6. The rollator as claimed in claim 4, wherein said seat unit is fixed to one of said first and second frame parts.
7. The rollator as claimed in claim 1, wherein said main support frame is U-shaped, and includes a central bight portion connected between bottom ends of said main support rods, at least one of said wheels being mounted on said central bight portion.
8. The rollator as claimed in claim 1, wherein said positioning frame has a shallow U-shaped configuration with an upward opening and two opposite ends pivoted to said backrest frame, said backrest frame having a deep U-shaped configuration with a downward opening and two opposite ends pivoted to said intermediate support frame.
9. A rollator, comprising:
a support frame assembly;
a plurality of spaced-apart wheels mounted on a bottom portion of said support frame assembly;
a seat unit including a seat that is mounted on said support frame assembly and that has a first positioning notch formed in a top surface thereof and proximate to a front end thereof, and a second positioning notch formed in said top surface and proximate to a rear end thereof;
a backrest unit including a backrest frame pivoted to said support frame assembly, and a positioning frame pivoted to said backrest frame, said positioning frame being engageable with a selected one of said first and second positioning notches, said backrest frame cooperating with said seat unit to define a seating space that faces rearward when said positioning frame is engaged with said first positioning notch, and cooperating with said seat unit to define a seating space that faces forward when said positioning frame is engaged with said second positioning notch; and
at least one umbrella support device that is disposed on an outer side of said support frame assembly, said umbrella support device including two spaced-apart hanging ring units, each of said hanging ring units including a connecting rod fixed to said main support frame, and a hanging ring rotatable 360 degrees relative to said connecting rod.
10. The rollator as claimed in claim 9, wherein said hanging ring includes a ring body, a tubular body extending radially from an outer surface of said ring body, and a passage hole extending through said ring body and said tubular body, said connecting rod having one end configured as a hook that is hooked to said main support frame, and the other end extending through said passage hole and formed with an external thread, each of said hanging ring units further including a limiting body having an outer diameter larger than an inner diameter of said passage hole, said limiting body having an internal thread to engage with said external thread of said connecting rod, said limiting body being fastened to one end of said connecting rod to prevent said connecting rod from escaping from said hanging ring.
11. The rollator as claimed in claim 10 wherein said passage hole has a hole diameter slightly smaller than an outer diameter of said connecting rod.
12. A rollator, comprising:
a support frame assembly;
a plurality of spaced-apart wheels mounted on a bottom portion of said support frame assembly;
a seat unit including a seat that is mounted on said support frame assembly and that has a first positioning notch formed in a top surface thereof and proximate to a front end thereof, and a second positioning notch formed in said top surface and proximate to a rear end thereof; and
a backrest unit including a backrest frame pivoted to said support frame assembly, and a positioning frame pivoted to said backrest frame, said positioning frame being engageable with a selected one of said first and second positioning notches, said backrest frame cooperating with said seat unit to define a seating space that faces rearward when said positioning frame is engaged with said first positioning notch, and cooperating with said seat unit to define a seating space that faces forward when said positioning frame is engaged with said second positioning notch,
wherein said support frame assembly includes a main support frame, said main support frame including two spaced-apart main support rods, two handgrips respectively connected to top ends of said main support rods, and two cover bodies each covering a pivot junction of one of said main support rods and a respective one of said handgrips, each of said cover bodies including at least one positioning stud projecting from an outer surface thereof, said rollator further comprising a cup holder that is hung removably on said positioning stud, said cup holder including a cup holder body defining an accommodation space for accommodating a container, and a hanging portion formed on said cup holder body.
13. The rollator as claimed in claim 12, wherein said hanging portion is configured as a through hole extending through one side of said cup holder body and having a size conforming with that of said positioning stud.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An antenna for a wireless communication terminal with at least one essentially planar radiating element, wherein at least one section of the radiating element is folded in a waving or meandering fashion and wherein the folded section of the radiating element is three-dimensionally double-folded by folding lengthwise in at least two directions arranged at an angle in relation to each other.
2. An antenna according to claim 1, wherein folding lines define the folds of the radiator element and the folding lines are interrupted at intervals by material attenuation zones.
3. An antenna according to claim 2, wherein the material attenuation zones are formed by gaps in the radiating element.
4. An antenna according to claim 3, wherein the gaps are small enough in relation to the total area of the radiating element not to significantly influence the electrical behavior of the radiating element.
5. An antenna according to claim 1 wherein the material attenuation zones or gaps are designed to be at the crossing points of the folding lines enclosed by the angle.
6. An antenna according to claim 1 wherein the angle is a right angle.
7. An antenna according to claim 1, characterized by a zigzagging folding of the radiating element in a first direction.
8. An antenna according to claim 1, characterized by a zigzagging folding of the radiating element in a second direction.
9. An antenna according to claim 7, characterized by a zigzagging folding of the radiating element in a second direction.
10. An antenna according to claim 1, characterized by a meandering folding of the radiating element in a first direction.
11. An antenna according to claim 1, characterized by a meandering folding of the radiating element in a second direction.
12. An antenna according to claim 10, characterized by a meandering folding of the radiating element in a second direction.
13. An antenna according to claim 7, characterized by a meandering folding of the radiating element in a second direction.
14. An antenna according to claim 8, characterized by a meandering folding of the radiating element in a first direction.
15. An antenna according to claim 1 wherein the folding occurs in a continuous grid pattern and all folding lines are spaced evenly.
16. A radiating element according to claim 1 wherein folding occurs in a continuous grid pattern and the folding lines forming a zigzag pattern alternate with flat sections running in the first direction.
17. An antenna according to claim 1 wherein one of the two directions is parallel to the surface of a mass area.
18. An antenna according to claim 1 wherein one of the two directions is vertical to the surface of a mass area.