Headrest Extension Device

Abstract

The present invention discloses a headrest extension device, which is characterized in that it includes: a mounting plate fixedly installed on the headrest frame of a sofa chair; a ratchet wheel having a first connecting plate and a second connecting plate, and the ratchet wheel is fixed to the mounting plate through the first connecting plate; a headrest connecting plate, a first link group and a second link group; the upper end of the first link group is pivotally connected to the rear end position of the headrest connecting plate, and the lower end is pivotally connected to the outer end position of the second connecting plate. The upper end of the second link group is pivotally connected to the middle position of the headrest connecting plate, and the lower end is pivotally connected to the mounting plate. At the same time, the second link group is pivotally connected to the second connecting plate; after the second connecting plate rotates, it drives the headrest connecting plate to swing back and forth through the first link group and the second link group. The present invention has the characteristics of simple structure, small and compact size.

Description

Technical Field

[0001] The present invention relates to the field of sofa accessories, and particularly to a headrest extension device. Background Art

[0002] In order to increase the comfort of a sofa chair, a headrest with adjustable position is usually installed at the top of the backrest of the sofa, and a lumbar backrest with adjustable position is installed in the middle of the backrest. The positions of these headrests relative to the backrest are adjustable, so that the sofa can be adjusted to a relatively comfortable state during daily use.

[0003] In the prior art, when installing a headrest with adjustable position on a backrest, a large number of parts are required, resulting in a relatively complex installation structure of the headrest on the backrest, and further resulting in a relatively large size of the headrest installation structure. Therefore, there is room for further improvement in the existing headrest installation structures on the market. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a headrest extension device, which has the characteristics of simple structure, small and compact.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A headrest extension device, characterized in that it includes:

[0007] A mounting plate, fixedly installed on the headrest frame of the sofa chair;

[0008] A ratchet wheel, having a first connecting plate and a second connecting plate, and the ratchet wheel is fixed to the mounting plate through the first connecting plate;

[0009] A headrest connecting plate, a first link group and a second link group; the upper end of the first link group is pivotally connected to the rear end position of the headrest connecting plate, and the lower end is pivotally connected to the outer end position of the second connecting plate. The upper end of the second link group is pivotally connected to the middle position of the headrest connecting plate, and the lower end is pivotally connected to the mounting plate. At the same time, the second link group is pivotally connected to the second connecting plate;

[0010] After the second connecting plate rotates, it drives the headrest connecting plate to swing back and forth through the first link group and the second link group.

[0011] Preferably, the second link group includes an upper link and a lower link. The upper end of the upper link is pivotally connected to the middle position of the headrest connecting plate, the lower end is pivotally connected to the end of the lower link, and the middle part is pivotally connected to the second connecting plate. The end of the lower link facing away from the upper link is pivotally connected to the mounting plate.

[0012] Preferably, the first link group, the upper link and the lower link all have bending parts.

[0013] Preferably, the headrest connecting plate includes a pivot plate for pivotally connecting the first link group and the second link group, and a headrest plate for connecting the headrest.

[0014] Preferably, the portion of the mounting plate where the first connecting plate and the lower link are connected protrudes outward.

[0015] The advantages of the present invention are as follows: In the natural state, the ratchet has a one-way rotation function. When the second connecting plate rotates one-way, the headrest connecting plate is driven by the first link group and the second link group to swing forward as a whole for the user's head to rest on; by triggering the switch of the ratchet, the second connecting plate can be rotated in the reverse direction, and the headrest connecting plate is driven by the first link group and the second link group to be folded; in the above structure, the headrest connecting plate can realize the functions of unfolding and folding only through the ratchet, the first link group and the second link group, and has the characteristics of simple and compact structure, few parts used and small size. Description of the Drawings

[0016] Figure 1 Schematic diagram of the headrest extension device provided by this embodiment in the open state;

[0017] Figure 2 Schematic diagram of the headrest extension device provided by this embodiment in the folded state;

[0018] Figure 3 Schematic diagram of the headrest extension device provided by this embodiment installed on the headrest frame. Detailed Embodiment

[0019] Combined with Figures 1 to 3 The headrest extension device of the present invention will be further described.

[0020] A headrest extension device, characterized in that it includes: a mounting plate 5, which is fixedly installed on the headrest frame 6 of the sofa chair by bolts; a ratchet 4, which has a first connecting plate 41 and a second connecting plate 42, and the ratchet 4 is fixed on the mounting plate 5 through the first connecting plate 41, that is, the first connecting plate 41 is fixed on the mounting plate 5 by a plurality of bolts; a headrest connecting plate 1, a first link group 2 and a second link group 3; the upper end of the first link group 2 is pivotally connected to the rear end position of the headrest connecting plate 1, and the lower end is pivotally connected to the outer end position of the second connecting plate 42. The upper end of the second link group 3 is pivotally connected to the middle position of the headrest connecting plate 1, and the lower end is pivotally connected to the mounting plate 5. At the same time, the second link group 3 is pivotally connected to the second connecting plate 42; after the second connecting plate 42 rotates, the headrest connecting plate 1 is driven by the first link group 2 and the second link group 3 to swing back and forth.

[0021] Specifically, the first connecting plate 41 is a fixed structure relative to the ratchet 4 and is used for fixing the ratchet 4 on the mounting plate 5; as Figure 1As shown, the second connecting plate 42 can rotate counterclockwise unidirectionally relative to the ratchet wheel 4. After triggering the corresponding switch, the second connecting plate 42 can rotate forward and backward. This ratchet wheel is a prior art and will not be described in detail in this embodiment.

[0022] The first link group 2 is a rod body. The second link group 3 includes an upper link 31 and a lower link 32. The upper end of the upper link 31 is pivotally connected to the middle position of the headrest connecting plate 1, the lower end is pivotally connected to the end of the lower link 32, and the middle part is pivotally connected to the second connecting plate 42. The end of the lower link 32 facing away from the upper link 31 is pivotally connected to the mounting plate 5.

[0023] The first link group 2, the upper link 31, and the lower link 32 all have bending parts 7. During the relative rotation of the first link group 2 and the second link group 3, these bending parts can avoid each other, enabling the first link group 2 and the second link group 3 to rotate smoothly.

[0024] The headrest connecting plate 1 includes a pivot plate 12 for pivotally connecting the first link group 2 and the second link group 3 and a headrest plate 11 for connecting the headrest. The headrest plate 11 is perpendicular to the pivot plate 12 to facilitate the positioning and installation of the headrest on the headrest plate 11.

[0025] The part of the mounting plate 5 for connecting the first connecting plate 41 and the lower link 32 protrudes outward. This outward protruding structure is formed by bending the mounting plate 5. In this structure, the ratchet wheel 4 and the second link group 3 can be isolated from the headrest frame 6, facilitating the movement of the corresponding parts.

[0026] In specific use, there are two sets of headrest extension devices, and the two sets of headrest extension devices are symmetrically installed on the headrest frame 6 through the corresponding mounting plates 5; the headrest 8 is installed on two headrest connecting plates 1. As Figure 2 shown, when it is necessary to adjust the forward swing of the headrest, directly pull the headrest 8 connected to the headrest plate forward. In the natural state, since the second connecting plate 42 rotates unidirectionally, the headrest cannot swing backward and can be directly leaned on by the user's head; if it is necessary to adjust the backward swing of the headrest, the corresponding switch on the ratchet wheel 4 needs to be touched to enable the second connecting plate 42 to rotate in the reverse direction, and then the backward swing of the headrest can be adjusted. In the above structure, the headrest connecting plate 1 can realize the functions of unfolding and folding only through the ratchet wheel 4, the first link group 2, the upper link 31, and the lower link 32, and has the characteristics of simple and compact structure, few parts used, and small size.

[0027] Unless otherwise specified, in the present invention, if there are terms such as "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to describe the orientation or positional relationship in the present invention are only for illustrative purposes and should not be construed as a limitation on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood in combination with the drawings and according to specific circumstances.

[0028] Unless otherwise clearly specified and defined, in the present invention, if there are terms such as "arranged", "connected" and "coupled", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A headrest extension device, characterized in that it includes: a mounting plate fixedly mounted on the headrest frame of a sofa chair; a ratchet wheel having a first connecting plate and a second connecting plate, and the ratchet wheel is fixed to the mounting plate through the first connecting plate; a headrest connecting plate, a first link group and a second link group; the upper end of the first link group is pivotally connected to the rear end position of the headrest connecting plate, and the lower end is pivotally connected to the outer end position of the second connecting plate. The upper end of the second link group is pivotally connected to the middle position of the headrest connecting plate, and the lower end is pivotally connected to the mounting plate. At the same time, the second link group is pivotally connected to the second connecting plate; After the second connecting plate rotates, it drives the headrest connecting plate to swing back and forth through the first link group and the second link group; The second link group includes an upper link and a lower link. The upper end of the upper link is pivotally connected to the middle position of the headrest connecting plate, the lower end is pivotally connected to the end of the lower link, and the middle part is pivotally connected to the second connecting plate. The end of the lower link facing away from the upper link is pivotally connected to the mounting plate; The first link group, the upper link and the lower link all have bent parts; The headrest connecting plate includes a pivot plate for pivotally connecting the first link group and the second link group and a headrest plate for connecting the headrest.

2. The headrest extension device according to claim 1, characterized in that: The part of the mounting plate for connecting the first connecting plate and the lower link protrudes outward.

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