Backrest mechanism capable of being put down

Abstract

The utility model discloses a backrest mechanism capable of being put down. The backrest mechanism capable of being put down comprises a first backrest linkage rod, a first backrest supporting rod is arranged at the top of the first backrest linkage rod, the front portion of the first backrest supporting rod is in pivot joint with a first backrest connecting rod through a first shaft, and the bottom of the first backrest supporting rod is in pivot joint with a second backrest linkage rod through a second shaft. A second backrest supporting rod is arranged between the rear portion of the second backrest linkage rod and the first backrest supporting rod, an oblong hole for the second shaft to slide is formed in the lower portion of the second backrest supporting rod, and a backrest mounting support is arranged at the top of the first backrest supporting rod and the top of the second backrest supporting rod and comprises a third backrest linkage rod. The middle of the third backrest linkage rod is in pivot joint with the second backrest supporting rod through a third shaft, the lower side of the tail of the third backrest linkage rod is in pivot joint with the first backrest supporting rod through a fourth shaft, and the upper side of the tail of the third backrest linkage rod is movably connected with a backrest mounting plate. The problems that in the prior art, due to the fact that the occupied three-dimensional space is large, the encasement number is small, and the transportation cost is high are solved.

Description

Technical Field

[0001] This utility model relates to the field of home furnishing manufacturing, and in particular to a reclining backrest mechanism. Background Technology

[0002] There is an existing Chinese utility model patent with publication number CN203468044U, entitled "An Electric Swinging Mechanical Extension Device". This electric swinging mechanical extension device consists of a leg structure, a drive unit, a seat structure, and a backrest structure. The backrest mounting bracket in the backrest mechanism is used to install the backrest; however, the top of the installed backrest extends above the armrests, causing the movable seat to occupy a large amount of vertical space, resulting in a small number of movable seats that can be packed in a box and high transportation costs. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a reclining backrest mechanism that can increase the number of boxes packed and reduce transportation costs.

[0004] To achieve the above objectives, the technical solution adopted by the reclining backrest mechanism of this utility model is as follows:

[0005] A reclining backrest mechanism includes a backrest linkage rod 1, a backrest support rod 1 at the top of the backrest linkage rod 1, the front of the backrest support rod 1 being pivotally connected to a backrest connecting rod 1 via a first shaft, a backrest linkage rod 2 at the bottom of the backrest support rod 1 via a second shaft, a backrest support rod 2 between the rear of the backrest linkage rod 1 and the backrest support rod 1, and an elongated hole for sliding along a second shaft at the lower part of the backrest support rod 2. A backrest mounting bracket is provided at the top of the backrest support rods 1 and 2, the backrest mounting bracket including a backrest linkage rod 3, the middle of the backrest linkage rod 3 being pivotally connected to the backrest support rod 2 via a third shaft, the lower side of the tail of the backrest linkage rod 3 being pivotally connected to the backrest support rod 1 via a fourth shaft, and a backrest mounting plate being movably connected to the upper side of the tail of the backrest linkage rod 3.

[0006] Preferably, the backrest linkage rod three and the backrest mounting plate are pivotally connected by a fifth axis, and at least one bolt assembly is provided to cooperate with the fifth axis to fix the backrest linkage rod three and the backrest mounting plate.

[0007] Preferably, the backrest linkage rod three and the backrest mounting plate are connected by at least two bolt assemblies.

[0008] Preferably, a bushing or bearing is fitted onto the outer side of the second shaft, and the distance between the two straight sides of the elongated hole matches the outer diameter of the bushing or bearing.

[0009] Preferably, one end of the bushing or bearing abuts against the second backrest linkage rod, and the other end protrudes through an elongated hole and abuts against the first backrest support rod.

[0010] Compared with the prior art, this utility model has the following advantages:

[0011] The original backrest mounting bracket is split into a backrest linkage rod and a backrest mounting plate, which are movably connected. When packing, the backrest can be laid down first to reduce the three-dimensional space occupied by the movable seat, thereby increasing the number of boxes and reducing transportation costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the reclining backrest mechanism of this utility model.

[0013] Figure 2 This is an assembly diagram of the backrest linkage rod 2 and the backrest support rods 1 and 2.

[0014] Figure 3 This is a diagram showing the packing status of a functional iron frame with a reclining backrest mechanism.

[0015] Figure 4 This is a diagram showing the usage status of a functional iron frame with a reclining backrest mechanism.

[0016] Among them, 10 is the backrest linkage rod one, 20 is the backrest support rod one, 30 is the first shaft, 40 is the second shaft, 50 is the backrest linkage rod two, 60 is the backrest support rod two, 601 is the oblong hole, 70 is the bushing, 80 is the backrest mounting bracket, 801 is the backrest linkage rod three, 802 is the backrest mounting plate, 90 is the third shaft, 100 is the fourth shaft, and 110 is the fifth shaft. Detailed Implementation

[0017] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0018] like Figure 1-4As shown, a reclining backrest mechanism includes a backrest linkage rod 10, a backrest support rod 20 at the top of the linkage rod 1, a front part of the support rod 1 pivotally connected to the backrest linkage rod 1 via a first shaft 30, a backrest linkage rod 50 pivotally connected to the bottom of the support rod 1 via a second shaft 40, a backrest support rod 60 between the rear part of the support rod 2 and the support rod 1, an elongated hole 601 for sliding the second shaft is opened at the lower part of the support rod 2, a bushing 70 is sleeved on the outer side of the second shaft, the distance between the two straight sides of the elongated hole matches the outer diameter of the bushing, the bushing is an oil-free engineering plastic bushing, which can avoid mutual wear between the first shaft and the sidewall of the elongated hole, and also reduces noise, one end of the bushing abuts against the backrest linkage rod 2, and the other end protrudes. The elongated hole abuts against the first backrest support rod. Similarly, the bushing separates the first and second backrest support rods to prevent them from wearing each other and also to reduce noise. The top of the first and second backrest support rods is provided with a backrest mounting bracket 80. The backrest mounting bracket includes a third backrest linkage rod 801. The middle part of the third backrest linkage rod is pivotally connected to the second backrest support rod via a third shaft 90. The lower side of the tail of the third backrest linkage rod is pivotally connected to the first backrest support rod via a fourth shaft 100. The upper side of the tail of the third backrest linkage rod is movably connected to the backrest mounting plate 802. The third backrest linkage rod and the backrest mounting plate are pivotally connected via a fifth shaft 110 and are equipped with two bolt assemblies. The two bolt assemblies are located on both sides of the fifth shaft and cooperate with the fifth shaft to fix the third backrest linkage rod and the backrest mounting plate.

[0019] The specific working process and principle of the reclining backrest mechanism of this utility model: When the movable seat is packed, the bolt assemblies on both sides of the fifth axis are removed, and the backrest is turned towards the seat cushion, which reduces the three-dimensional space occupied by the movable seat, thereby increasing the number of boxes packed and reducing transportation costs. When it arrives at the customer's place, the backrest is flipped up, and the bolt assembly is used to connect the backrest linkage rod three and the backrest mounting plate into a whole, keeping the backrest in the use state.

[0020] Another movable connection method for the backrest linkage rod and the backrest mounting plate is that they are connected by a three-bolt assembly. One bolt assembly can be retained during packaging as a pivot point, making it convenient for the backrest to recline onto the seat cushion.

[0021] This invention separates the original backrest mounting bracket into a backrest linkage rod and a backrest mounting plate, which are movably connected, allowing the backrest to be laid down, thereby increasing the product's packing capacity.

Claims

1. A reclining backrest mechanism, comprising a backrest linkage rod one, a backrest support rod one disposed at the top of the backrest linkage rod one, the front part of the backrest support rod one being pivotally connected to the backrest linkage rod one via a first shaft, a backrest linkage rod two being pivotally connected to the bottom of the backrest support rod one via a second shaft, a backrest support rod two disposed between the rear part of the backrest linkage rod two and the backrest support rod one, an elongated hole for sliding the second shaft being opened at the lower part of the backrest support rod two, and a backrest mounting bracket disposed at the top of the backrest support rods one and two, characterized in that: The backrest mounting bracket includes a backrest linkage rod three. The middle part of the backrest linkage rod three is pivotally connected to the backrest support rod two via a third shaft. The lower side of the tail of the backrest linkage rod three is pivotally connected to the backrest support rod one via a fourth shaft. A backrest mounting plate is movably connected to the upper side of the tail of the backrest linkage rod three.

2. The reclining backrest mechanism according to claim 1, characterized in that: The backrest linkage rod three and the backrest mounting plate are pivotally connected by a fifth axis, and at least one bolt assembly is provided to cooperate with the fifth axis to fix the backrest linkage rod three and the backrest mounting plate.

3. The reclining backrest mechanism according to claim 1, characterized in that: The backrest linkage rod three and the backrest mounting plate are connected by at least two bolt assemblies.

4. The reclining backrest mechanism according to claim 1, characterized in that: The outer side of the second shaft is fitted with a bushing or bearing, and the distance between the two straight sides of the elongated hole matches the outer diameter of the bushing or bearing.

5. The reclining backrest mechanism according to claim 4, characterized in that: One end of the bushing or bearing abuts against the second backrest linkage rod, and the other end protrudes through an elongated hole and abuts against the first backrest support rod.

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