US 11,219,563 B2 · Adjustable backrest and wheelchair therewith

Abstract

An adjustable backrest is adapted for a chair frame and includes a first pivoting component, a second pivoting component, a backrest sliding assembly and a backrest connecting component. The second pivoting component is pivoted to the first pivoting component. The backrest sliding assembly is slidably disposed on the first pivoting component. The backrest connecting component is disposed between the first pivoting component and the second pivoting component. A first end of the backrest connecting component is pivoted to the backrest sliding assembly. A second end of the backrest connecting component is pivoted to the second pivoting component. The backrest sliding assembly drives the second pivoting component to pivot relative to the first pivoting component by the backrest connecting component when the at least one backrest sliding assembly slides relative to the first pivoting component, so as to support a user's back portion at different angles.

Claims20

Dependent claims

An adjustable backrest adapted for a chair frame whereon a user sits, the adjustable backrest comprising:

a first pivoting component;
a second pivoting component pivoted to the first pivoting component;
at least one backrest sliding assembly slidably disposed on the first pivoting component;
and
at least one backrest connecting component disposed between the first pivoting component and the second pivoting component, a first end of the at least one backrest connecting component being pivoted to the at least one backrest sliding assembly, a second end of the at least one backrest connecting component being pivoted to the second pivoting component, and the at least one backrest sliding assembly driving the second pivoting component to pivot relative to the first pivoting component by the at least one backrest connecting component when the at least one backrest sliding assembly slides relative to the first pivoting component;
wherein one of the first pivoting component and the second pivoting component is pivoted to the chair frame, and another of the first pivoting component and the second pivoting component supports the user's back portion.

3 more elements

A wheelchair comprising:

a chair frame whereon a user sits;
and
an adjustable backrest comprising:
a first pivoting component;
a second pivoting component pivoted to the first pivoting component;
at least one backrest sliding assembly slidably disposed on the first pivoting component;
and
at least one backrest connecting component disposed between the first pivoting component and the second pivoting component, a first end of the at least one backrest connecting component being pivoted to the at least one backrest sliding assembly, a second end of the at least one backrest connecting component being pivoted to the second pivoting component, and the at least one backrest sliding assembly driving the second pivoting component to pivot relative to the first pivoting component by the at least one backrest connecting component when the at least one backrest sliding assembly slides relative to the first pivoting component;
wherein one of the first pivoting component and the second pivoting component is pivoted to the chair frame, and another of the first pivoting component and the second pivoting component supports the user's back portion.

6 more elements

Dependencies are inferred from the claim text.

Adjustable backrest and wheelchair therewith

Life of this patent

Adjustable backrest and wheelchair therewith

Life of this patent

Abstract

Claims20