Chair backrest panel positioning device

Abstract

A chair backrest panel positioning device includes a backrest panel frame and a backrest panel. The backrest panel frame has a hollow configuration, is formed along the rear side of the seat of a chair, and has two upper lateral portions configured for retaining predetermined portions of the backrest panel respectively. The backrest panel is separately formed, may or may not conform in shape to the backrest panel frame, and features proper elasticity. The backrest panel frame further has two lateral portions which are at a predetermined height and are configured for clamping the corresponding areas of the backrest panel respectively. Once mounted to the backrest panel frame, the backrest panel can be leaned on elastically.

Claims

1. A chair backrest panel positioning device, configured to enable a backrest of a chair to be leaned on comfortably, with the chair backrest panel positioning device comprising a backrest panel frame and a backrest panel, wherein the backrest panel frame has a hollow configuration, is formed along a rear side of a seat of the chair, and has two upper lateral portions configured for retaining predetermined portions of the backrest panel respectively; wherein the backrest panel is separately formed and has elasticity; wherein the backrest panel frame further has two lateral portions which are at a predetermined height and are configured for clamping corresponding areas of the backrest panel respectively, wherein in order for the backrest panel frame to retain the backrest panel, the two upper lateral portions of the backrest panel frame are each extended with a pin, wherein the pins of the two upper lateral portions face each other and each is concavely formed with an annular groove, wherein the backrest panel has a rear side with two predetermined sections each formed with a hook, wherein the hooks of the two predetermined sections open downward and are engaged with the pins of the two upper lateral portions respectively, wherein each said hook has an inner side with a predetermined area protrudingly provided with a curved projection engaged with the annular groove of a corresponding one of the pins of the two upper lateral portions, wherein the backrest panel has a front side with two apertures corresponding in position to and extending from the hooks of the two predetermined sections respectively, wherein each said hook has a predetermined portion extended with a tube, wherein two limiting members conform in shape to the two apertures respectively and each have an end extended with a pressing flange, wherein each said pressing flange is inserted through a corresponding one of the two apertures of the backrest panel and is engaged with the annular groove of the corresponding one of the pins of the two upper lateral portions, wherein each said limiting member has a predetermined side penetrated by a hole, wherein a plurality of threaded fasteners is passed through the holes in the predetermined sides of the two limiting members respectively and are fastened in the tubes of the two predetermined sections of the backrest panel respectively, wherein the predetermined portions of the hooks of the two predetermined sections of the backrest panel are securely retained by the two upper lateral portions of the backrest panel frame respectively, and wherein the backrest panel, once mounted to the backrest panel frame, can be leaned on elastically.

2. The chair backrest panel positioning device of claim 1, wherein the backrest panel retained by the backrest panel frame is provided with at least one hollow slot to allow ventilation when the backrest panel is leaned on.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) FIG. 1 schematically shows the backrest panel of a conventional chair;

(2) FIG. 2 is an exploded perspective view of the chair backrest panel positioning device of the present invention;

(3) FIG. 2A is an enlarged view of the portion A in FIG. 2;

(4) FIG. 2B is an enlarged view of the portion B in FIG. 2;

(5) FIG. 2C is an enlarged view of the portion C in FIG. 2;

(6) FIG. 3 is an assembled perspective view of the chair backrest panel positioning device in FIG. 2;

(7) FIG. 3A is a sectional view of the portion A in FIG. 3;

(8) FIG. 4 is a front view of the chair backrest panel positioning device in FIG. 3, with an elastic backrest panel; and

(9) FIG. 5 is a side view of the chair backrest panel positioning device in FIG. 4.

DETAILED DESCRIPTION OF THE INVENTION

(10) The present invention provides a chair backrest panel positioning device to enhance the comfort of one who leans their back on the backrest of a chair. Referring to FIG. 2, the chair backrest panel positioning device includes a backrest panel frame 2 and a backrest panel 3. The backrest panel frame 2 has a hollow configuration, is formed along the rear side of the seat 1 of a chair 5, and has two upper lateral portions for retaining predetermined portions of the backrest panel 3 respectively. The backrest panel 3 is separately formed, may or may not conform in shape to the backrest panel frame 2, and has proper elasticity. The backrest panel frame 2 also has two lateral portions which are at a predetermined height and allow movement-limiting units 4 to clamp the corresponding areas of the backrest panel 3 respectively. The mechanism by which the backrest panel 3 is bilaterally clamped at the predetermined height of the backrest panel frame 2 is not a technical feature.

(11) In order for the backrest panel frame 2 to retain the backrest panel 3, the present invention further includes the following technical features: Referring to FIG. 2 and FIG. 2A, each of the two upper lateral portions of the backrest panel frame 2 is extended with a pin 21. The two pins 21 face each other and are each concavely formed with an annular groove 211 at a predetermined section. Two predetermined sections of the rear side of the backrest panel 3 are each formed with a hook 31 which opens downward. The hooks 31 are configured to engage with the pins 21 respectively. The inner side of each hook 31 is protrudingly provided with a curved projection 311 in a predetermined area. Each curved projection 311 is configured to engage with the annular groove 211 of the corresponding pin 21 of the backrest panel frame 2. As shown in FIG. 2B, the front side of the backrest panel 3 has two apertures 32 corresponding in position to and extending from the hooks 31 respectively. At least one tube 33 extends from a predetermined portion of each hook 31, as shown in FIG. 3A. In addition, two limiting members 34 whose shapes conform to those of the apertures 32 respectively are each extended with a pressing flange 341 at one end, as shown in FIG. 2C. Each pressing flange 341 is configured to be inserted through the corresponding aperture 32 of the backrest panel 3 and engaged with the annular groove 211 of the corresponding pin 21 of the backrest panel frame 2, as shown in FIG. 3A. Moreover, a predetermined side of each limiting member 34 is penetrated by at least one hole 342 through which a threaded fastener 35 can be passed in order to be fastened in the corresponding tube 33 of the backrest panel 3. The foregoing technical features enable the two upper lateral portions of the backrest panel frame 2 to respectively and securely retain the predetermined portions of the backrest panel 3, as shown in FIG. 3.

(12) Furthermore, referring to FIG. 4, the backrest panel 3, which is to be retained by the backrest panel frame 2, is provided with at least one hollow slot 36 to allow ventilation when leaned on. The at least one hollow slot 36 may or may not be arranged at a predetermined spacing.

(13) Once the separately formed backrest panel 3 is connected to the two predetermined lateral portions of, and hence mounted to, the backrest panel frame 2 of the chair 5, as shown in FIG. 5, a user can sit on the chair 5 and lean his or her back elastically against the backrest panel 3 on the backrest panel frame 2.