US-20260124084-A1 - ADJUSTING CHAIR

US20260124084A1US 20260124084 A1US20260124084 A1US 20260124084A1US-20260124084-A1

Abstract

An adjusting chair includes a seat frame, a backrest frame, a backrest sliding mechanism, a backrest linkage mechanism and a driving mechanism. The backrest frame is pivotally disposed at the seat frame and includes a first rail having a first guiding direction, and a second rail spaced apart from the first rail and has a second guiding direction. The backrest sliding mechanism includes a sliding element movably disposed at the first rail, and a backrest assembly connected to the sliding element. The backrest linkage mechanism is connected to the backrest sliding mechanism and guided by the second rail. The driving mechanism drives the backrest frame to rotate relative to the seat frame, the backrest linkage mechanism is moved along the second rail to drive the sliding element to move in the first rail, and the backrest assembly is moved relative to the backrest frame.

Inventors

Ming-Chuan Cheng
Shun-Yuan Cheng

Assignees

MERITS HEALTH PRODUCTS CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250512
Priority Date: 20241106

Claims (10)

1 . An adjusting chair, comprising: a seat frame; a backrest frame pivotally disposed at the seat frame and comprising: a first rail having a first guiding direction parallel to a length direction of the backrest frame; and a second rail spaced apart from the first rail and having a second guiding direction, wherein the second guiding direction is parallel to the length direction; a backrest sliding mechanism, comprising: a sliding element movably disposed at the first rail; and a backrest assembly connected to the sliding element; a backrest linkage mechanism connected to the backrest sliding mechanism and guided by the second rail; and a driving mechanism connected to the backrest frame; wherein the driving mechanism drives the backrest frame to rotate relative to the seat frame, the backrest linkage mechanism is moved along the second rail to drive the sliding element to move in the first rail, and the backrest assembly is moved relative to the backrest frame.
2 . The adjusting chair of claim 1 , wherein the first rail comprises: a rail frame; and an inner pad disposed within the rail frame; wherein the sliding element has a rod structure for coordinating with the inner pad.
3 . The adjusting chair of claim 2 , wherein the rail frame further comprises at least one positioning groove, the inner pad comprises at least one rib, and the at least one rib protrudes into the at least one positioning groove.
4 . The adjusting chair of claim 3 , wherein the rail frame has a metal body, and the inner pad has a groove-shaped plastic body.
5 . The adjusting chair of claim 1 , wherein the driving mechanism comprising: a fixing board, wherein one end of the fixing board is connected to the backrest frame; a pushing rod connected to another end of the fixing board; and an actuator connected to and driving the pushing rod.
6 . The adjusting chair of claim 1 , wherein the backrest linkage mechanism comprising: a connecting rod pivotally disposed at the backrest assembly; a swinging rod, wherein one end of the swinging rod is pivotally connected to the backrest frame and another end thereof is pivotally connected to the connecting rod, and the swinging rod comprises at least two pivoting holes; a first sliding rod, wherein an upper end of the first sliding rod is pivotally connected to any one of the at least two pivoting holes, and a lower end of the first sliding rod is restricted by the second rail; a slider slidably disposed at the second rail and being pivotally connected to first sliding rod; and a second sliding rod, wherein one end of the second sliding rod is pivotally connected to the slider and another end thereof is pivotally connected to the seat frame.
7 . An adjusting chair, comprising: a seat frame; a backrest frame pivotally disposed at the seat frame and comprising a first rail, the first rail having a first guiding direction parallel to a length direction of the backrest frame, and the first rail comprising; a rail frame; and an inner pad disposed within the rail frame and forming a guiding space; a backrest sliding mechanism, comprising: a sliding element movably accommodated in the guiding space, the sliding element having a rod structure for coordinating with the guiding space; and a backrest assembly connected to the sliding element; a backrest linkage mechanism connected to the backrest sliding mechanism; and a driving mechanism connected to the backrest frame; wherein the driving mechanism drives the backrest frame to rotate relative to the seat frame, the backrest linkage mechanism drives the sliding element to move in the first rail, and the backrest assembly is moved relative to the backrest frame.
8 . The adjusting chair of claim 7 , wherein the rail frame further comprises at least one positioning groove, the inner pad comprises at least one rib, and the at least one rib protrudes into the at least one positioning groove.
9 . The adjusting chair of claim 8 , wherein the rail frame has a metal body, and the inner pad has a groove-shaped plastic body.
10 . The adjusting chair of claim 7 , wherein the driving mechanism comprising: a fixing board, wherein one end of the fixing board is connected to the backrest frame; a pushing rod connected to another end of the fixing board; and an actuator connected to and driving the pushing rod.

Description

RELATED APPLICATIONS This application claims priority to Taiwan Application Serial Number 113142489, filed Nov. 6, 2024, which is herein incorporated by reference. BACKGROUND Technical Field The present disclosure relates to an adjusting chair. More particularly, the present disclosure relates to an adjusting chair with a tiltable backrest. Description of Related Art Chairs generally include a seat frame and a backrest, and the backrest may be configured for a back of a human body to rest thereon. In order to increase using comfort, the chair usually has a backrest adjusting function, which can allow the backrest to be pivoted relative to the seat frame, and the back of the human body may be relative inclined. Generally, as the user would like to adjust the backrest, the upper body may be straightened and then the backrest is adjusted, but for some elders or users who cannot control their bodies, the upper body may contacts with the backrest, and the back may be pulled when adjusting the angles, thereby generating discomfort. Based on the above, how to modify the structure of the chair to increase the using comfort becomes a target that those in the field pursue. SUMMARY According to one aspect of the present disclosure, an adjusting chair includes a seat frame, a backrest frame, a backrest sliding mechanism, a backrest linkage mechanism and a driving mechanism. The backrest frame is pivotally disposed at the seat frame and includes a first rail and a second rail. The first rail has a first guiding direction parallel to a length direction of the backrest frame. The second rail is spaced apart from the first rail and has a second guiding direction, and the second guiding direction is parallel to the length direction. The backrest sliding mechanism includes a sliding element and a backrest assembly. The sliding element is movably disposed at the first rail. The backrest assembly is connected to the sliding element. The backrest linkage mechanism is connected to the backrest sliding mechanism and guided by the second rail. The driving mechanism is connected to the backrest frame. The driving mechanism drives the backrest frame to rotate relative to the seat frame, the backrest linkage mechanism is moved along the second rail to drive the sliding element to move in the first rail, and the backrest assembly is moved relative to the backrest frame. According to one aspect of the present disclosure, an adjusting chair includes a seat frame, a backrest frame, a backrest sliding mechanism, a backrest linkage mechanism and a driving mechanism. The backrest frame is pivotally disposed at the seat frame and includes a first rail, the first rail has a first guiding direction parallel to a length direction of the backrest frame, and the first rail includes a rail frame and an inner pad. The inner pad is disposed within the rail frame and forms a guiding space. The backrest sliding mechanism includes a sliding element and a backrest assembly, the sliding element is movably accommodated in the guiding space, and the sliding element has a rod structure for coordinating with the guiding space. The backrest assembly is connected to the sliding element. The backrest linkage mechanism is connected to the backrest sliding mechanism. The driving mechanism is connected to the backrest frame. The driving mechanism drives the backrest frame to rotate relative to the seat frame, the backrest linkage mechanism drives the sliding element to move in the first rail, and the backrest assembly is moved relative to the backrest frame. BRIEF DESCRIPTION OF THE DRAWINGS The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: FIG. 1 shows a three-dimension schematic view of an adjusting chair according to one embodiment of the present disclosure. FIG. 2 shows a partial exploded view of the adjusting chair of the embodiment of FIG. 1. FIG. 3 shows a partial enlarged view of the adjusting chair of the embodiment of FIG. 1. FIG. 4 is a partial cross-sectional view of the adjusting chair of the embodiment of FIG. 1 taken along line 4-4. FIG. 5 shows one front view of a sliding element, a backrest sliding mechanism and a backrest frame of the adjusting chair of the embodiment of FIG. 1. FIG. 6 shows another front view of the sliding element, the backrest sliding mechanism and the backrest frame of the adjusting chair of the embodiment of FIG. 1. DETAILED DESCRIPTION It will be understood that when an element (or mechanism or module) is referred to as being “disposed on”, “connected to” or “coupled to” another element, it can be directly disposed on, connected or coupled to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being “directly disposed on”, “directly connected to” or “directly coupled to” another element, there are no intervening elements present. In additio