A footrest device for sitting or lying seat with parallelogram as main body

Abstract

The footrest device of a sitting or lying seat with a parallelogram as the main body structure of the present invention is composed of a seat frame component with a parallelogram frame and a footrest component. The upper ends of the left and right rear shelf side members with long grooves are respectively flexibly connected to the front ends of the left and right upper frame cross members, and the long grooves are flexibly connected to the left and right shelf support members fixed to the left and right lower frame cross members, and the other ends are respectively flexibly connected to the left and right front shelf side members with left and right oblique members, and the left and right shelf support members and the left and right push rods form a movable motion pair, and left and right elastic members are arranged between the left and right front shelf side members. The main body structure tilts backward, and the above parts are linked: the left and right shelf support members make the left and right rear shelf side members move forward and upward, push the left and right push rods and the left and right oblique members, so that the left and right front shelf side members flip forward and are positioned by the left and right positioning pins, so that the footrest pads thereon extend forward. On the contrary, they retract. The present invention is an improvement and enhancement of the footrest method of the sitting or lying seat with a parallelogram as the main body structure, and the overall linkage is achieved to achieve convenient, reliable and comfortable sitting or lying, and expand the scope of application.

Description

Technical Field

[0001] The invention relates to the technical field of furniture, in particular to a footrest device for sitting or lying furniture with a parallelogram as the main body structure. Background Art

[0002] The seating referred to in this article is a general term for chairs and sofas.

[0003] The three technical solutions, namely "retractable sitting and lying dual-purpose office and study chair" with patent number ZL201721517914.0, "a retractable sitting and lying dual-purpose chair" with patent number ZL201820336205.0, and "a main structure of a sitting and lying chair and a sitting and lying sofa with a movable locking device" with patent number ZL201920360712.2, attempt to achieve popular consumption of sitting and lying dual-purpose chairs, change the limitations of existing sitting and lying chairs, create conditions for naps and short breaks for office workers and other groups, create conditions for reducing "the various hazards caused by long-term sitting", and create conditions for improving venue utilization or adapting to narrow venues. The three technical solutions have two common and significant features: ① All of them use the parallelogram mechanism as the main mechanism, and use its motion characteristics to achieve dual-purpose of sitting and lying, which is stable and reliable; compared with the existing "lunch break chair", it is convenient to operate, reliable, and stable to use, and is more suitable for naps and short breaks; ② The lying position is convenient for the body to be upward and the feet to be placed on the ground, which is comfortable and stable. However, from our implementation practice, some users' requirements for the lying position are that it is convenient to lie up and lie sideways at the same time, and the feet should be placed higher.

[0004] In order to meet the requirements of this part of users and make this type of product have a wider application market, the limitations of its use are changed on the basis of ensuring the original product characteristics, and the movement characteristics of the parallelogram mechanism are further utilized. Through linkage, a footrest device is added to meet the customers' needs for convenient lying down or lying on the side, and for the comfort of resting their feet higher. Summary of the invention

[0005] The main purpose of the present invention is to provide a footrest device for sitting and lying seats with a parallelogram as the main body. This footrest device is an improvement and upgrade of the footrest methods of the three technical solutions of "telescopic sitting and lying dual-purpose office and study chair" with patent number ZL201721517914.0, "a telescopic sitting and lying dual-purpose chair" with patent number ZL201820336205.0, and "a main structure of a sitting and lying chair and a sitting and lying sofa with a movable locking device" with patent number ZL201920360712.2. On the basis of the above products and maintaining their advantages, the motion characteristics of their main bodies are further utilized to realize the linkage of the back of the seat, the seat, the footrest device and the armrest, and the footrest device is added to meet the customer's comfort needs of lying on the back and lying on the side, and the feet need to be placed higher, optimize the original products, and expand the market application scope. Compared with the existing "lunch break chair", it is more convenient and reliable to operate, more stable to use, and more suitable for office workers to take naps and rest.

[0006] In order to achieve the above-mentioned main purpose, the present invention is implemented through the following technical solutions. It is mainly composed of a seat frame component and a footrest component. The seat frame component is mainly composed of a support component assembly and a frame cross member assembly. The support component assembly is a front support component and a rear support component. The front support component is composed of a left front support component, a right front support component and a front cross member. One end of the front cross member is fixedly connected to a suitable position of the left front support component, and the other end of the front cross member is fixedly connected to a suitable position of the right front support component. The rear support component is composed of a left rear support component, a right rear support component and a rear cross member. One end of the rear cross member is fixedly connected to the left rear support component. The frame crosspiece assembly is composed of a seat member subassembly, a left lower frame crosspiece and a right lower frame crosspiece, the seat member subassembly is composed of a left upper frame crosspiece, a right upper frame crosspiece and a seat member, the left side of the seat member is connected to the left upper frame crosspiece, the right side of the seat member is connected to the right upper frame crosspiece, the front end of the left upper frame crosspiece is rotatably connected to the upper end of the left front support member, the rear end of the left upper frame crosspiece is rotatably connected to the left rear support member, and the The front end of the right upper frame crosspiece is rotatably connected to the upper end of the right front support member, the rear end of the right upper frame crosspiece is rotatably connected to the appropriate position of the right rear support member, the front end of the left lower frame crosspiece is rotatably connected to the appropriate position of the left front support member, the rear end of the left lower frame crosspiece is rotatably connected to the appropriate position of the left rear support member, the front end of the right lower frame crosspiece is rotatably connected to the appropriate position of the right front support member, and the rear end of the right lower frame crosspiece is rotatably connected to the appropriate position of the left rear support member. At the appropriate position of the right rear support member, the four-bar mechanism composed of the left upper frame cross member, the left front support member, the left rear support member and the left lower frame cross member is a left parallelogram mechanism, and the four-bar mechanism composed of the right upper frame cross member, the right front support member, the right rear support member and the right lower frame cross member is a right parallelogram mechanism. The left parallelogram mechanism and the right parallelogram mechanism are connected by the front cross member, the rear cross member and the seat member to form a parallelogram frame.The footrest component is mainly composed of a shelf support member, a shelf side member and a footrest pad. The shelf support members include a left shelf support member and a right shelf support member, and the shelf side members include a left shelf side member and a right shelf side member. One end of the left shelf support member is connected to a suitable position of the parallelogram frame, and the other end of the left shelf support member is rotatably connected to a suitable position of the left shelf side member. One end of the right shelf support member is connected to a suitable position of the parallelogram frame, and the other end of the right shelf support member is movably connected to a suitable position of the right shelf side member. One end of the left shelf side member is rotatably connected to a suitable position of the upper front left part of the parallelogram frame, and one end of the right shelf side member is rotatably connected to a suitable position of the upper front right part of the parallelogram frame. The footrest pad is connected to the shelf side members.

[0007] The shelf support member is a shelf support member I, and the shelf support member I is a left shelf support member I and a right shelf support member I, the shelf side member is a shelf side member I, and the shelf side member I is a left shelf side member I and a right shelf side member I, and the footrest pad is a footrest pad I, one end of the left shelf support member I is rotatably connected to a suitable position of the rear support assembly, the other end of the left shelf support member I is rotatably connected to a suitable position of the left shelf side member I, one end of the right shelf support member I is rotatably connected to a suitable position of the rear support assembly, the other end of the right shelf support member I is rotatably connected to a suitable position of the right shelf side member I, the upper end of the left shelf side member I is rotatably connected to a suitable position of the upper front left part of the parallelogram frame, the upper end of the right shelf side member I is rotatably connected to a suitable position of the upper front right part of the parallelogram frame, and the footrest pad I is connected to the left shelf side member I and the right shelf side member I.

[0008] The shelf support member is a shelf support member II, the shelf support member II is a left shelf support member II and a right shelf support member II, the shelf side member is a shelf side member II, the shelf side member II is a left shelf side member II and a right shelf side member II, the footrest pad is a footrest pad II, and long grooves are provided at appropriate positions of the left shelf side member II and the right shelf side member II. One end of the left shelf support member II is fixedly connected to the left lower frame cross member of the left parallelogram mechanism, and the other end of the left shelf support member II is fixedly connected to the left shelf side member II. The long groove is movably connected, one end of the right shelf support II is fixedly connected to the right lower frame cross piece of the right parallelogram mechanism, the other end of the right shelf support II is movably connected to the long groove of the right shelf side piece II, the upper end of the left shelf side piece II is rotatably connected to a suitable position on the upper front left part of the parallelogram frame, the upper end of the right shelf side piece II is rotatably connected to a suitable position on the upper front right part of the parallelogram frame, and the footrest pad II is connected to the left shelf side piece II and the right shelf side piece II.

[0009] The shelf support member is the shelf support member III, the shelf support member III is the left shelf support member III and the right shelf support member III, the shelf side member is the shelf side member III, the shelf side member III is composed of the front shelf side member III and the rear shelf side member III, the front shelf side member III is divided into the left front shelf side member III and the right front shelf side member III, the rear shelf side member III is divided into the left rear shelf side member III and the right rear shelf side member III, the footrest is the footrest III, the upper end of the left rear shelf side member III is rotatably connected to a suitable position on the upper front left part of the parallelogram frame, and the upper end of the right rear shelf side member III is rotatably connected to Long grooves are provided at appropriate positions of the upper front right part of the parallelogram frame, the left rear shelf side member III and the right rear shelf side member III, one end of the left shelf support member III is fixedly connected to the left lower frame cross member of the left parallelogram mechanism, the other end of the left shelf support member III is movably connected to the long groove of the left rear shelf side member III, one end of the right shelf support member III is fixedly connected to the right lower frame cross member of the right parallelogram mechanism, the other end of the right shelf support member III is movably connected to the long groove of the right rear shelf side member III, and the long groove of the left rear shelf side member III is movably connected with a left push rod I II, the left rear shelf side piece III and the left push rod III form a left motion moving pair, the long groove of the right rear shelf side piece III is movably connected with the right push rod III, the right rear shelf side piece III and the right push rod III form a right motion moving pair, the other end of the left rear shelf side piece III is rotatably connected to one end of the left front shelf side piece III, the other end of the right rear shelf side piece III is rotatably connected to one end of the right front shelf side piece III, one end of the left front shelf side piece III is provided with a left oblique piece III, one end of the right front shelf side piece III is provided with a right oblique piece III, the left front shelf side piece III One end of the left elastic member III is connected to a suitable position, the other end of the left elastic member III is connected to a suitable position of the left rear shelf side member III, one end of the right elastic member III is connected to a suitable position of the right front shelf side member III, the other end of the right elastic member III is connected to a suitable position of the right rear shelf side member III, a left positioning pin III is arranged between the left rear shelf side member III and the left front shelf side member III, a right positioning pin III is arranged between the right rear shelf side member III and the right front shelf side member III, and the footrest pad III is connected to the left front shelf side member III and the right front shelf side member III.

[0010] Positioning pieces are arranged at appropriate positions of the parallelogram frame.

[0011] Through the above structure, a technical solution of a footrest device for sitting or lying furniture with a parallelogram as the main structure can form the following three typical technical solutions of footrest devices, and the main operations and actions are described using these three typical technical solutions of footrest devices as examples.

[0012] 1. The shelf support member I is movably connected to the rear support combination member.

[0013] When the seat is in a sitting position, the footrest pad I is retracted by the left support member I and the right support member I to the front lower part of the seat component of the seat. In the process of switching the seat from a sitting position to a lying position, the footrest device generates the following linkage: the entire parallelogram frame gradually tilts backward, and the left support member I and the right support member I movably connected thereto are pushed forward relative to the front upper part of the parallelogram frame, so that the left shelf side member I and the right shelf side member I movably connected to the other end of the left support member I and the right support member I revolve around the connection point of the front upper part of the parallelogram frame and rotate forward until the parallelogram frame is positioned at a certain position by the positioning member or the locking member, so that the seat is translated downward and the footrest pad I is stretched forward, completing the switching from a sitting position to a lying position.

[0014] During the process of switching the seat from a lying position to a sitting position, the footrest device generates the following linkage: the rear support combination at the rear of the parallelogram frame is gradually reset forward, and the left shelf support member I and the right shelf support member I movably connected thereto are pulled backward relative to the front upper part of the parallelogram frame, so that the left shelf side member I and the right shelf side member I movably connected to the other ends of the left shelf support member I and the right shelf support member I revolve around the connection point at the front upper part of the parallelogram frame and rotate backward, thereby realizing the upward translation of the seat and the retraction of the footrest I, until the parallelogram frame is locked in the sitting position by the locking member, thereby realizing the switching from the lying position to the sitting position.

[0015] 2. The left shelf support member II and the right shelf support member II are respectively fixedly connected to the left lower frame cross member and the right lower frame cross member.

[0016] When the seat is in the sitting position, the footrest pad II is retracted at the front lower part of the seat component small component of the seat by the left support member II and the right support member II. When the seat is switched from a sitting position to a lying position, the footrest device produces the following linkage: the entire parallelogram frame gradually tilts backwards, and the upper ends of the left and right shelf side pieces II and II are movably connected to the rotation points of the front upper part of the parallelogram frame and move backward and downward. This backward and downward movement distance is greater than the backward and downward translation distance of the left and right shelf support pieces II and II, which are respectively fixed to the left and right lower frame cross pieces. This downward and backward movement distance difference, plus the movably connected long grooves of the left and right shelf side pieces II and II at the upper ends of the left and right shelf support pieces II and II, respectively, makes the left and right shelf side pieces II revolve around the active connection points of the front upper part of the parallelogram frame, rotate forward and extend forward at the same time until the parallelogram frame is positioned at a certain position by the positioning piece or the locking piece, thereby realizing the forward extension of the footrest II and the downward translation of the seat piece, and completing the switching from a sitting position to a lying position.

[0017] When the seat is switched from a lying position to a sitting position, the footrest device generates the following linkage: the entire parallelogram frame is reset forward, and the rotation point where the upper ends of the left shelf side member II and the right shelf side member II are movably connected to the front upper part of the parallelogram frame moves forward and upward. The forward and upward movement distance is greater than the forward and upward translation distance of the left shelf support member II and the right shelf support member II respectively fixed to the left lower frame cross member and the right lower frame cross member. The difference in the upward and forward movement distance plus the difference in the left and right shelf support member I The footrest pad II is again retracted by the left and right shelf supports II to the lower front part of the seat component of the seat, thereby realizing the backward retraction and resetting of the footrest pad II and realizing the switching from lying position to sitting position.

[0018] 2. The shelf side piece III is composed of the front shelf side piece III and the rear shelf side piece III.

[0019] When the seat is in a sitting position, the footrest III is contracted by the left support member III, the right support member III, the left elastic member III and the right elastic member III to the front lower part of the seat subassembly of the seat. In the process of switching the seat from a sitting position to a lying position, the footrest device generates the following linkage: the entire parallelogram frame gradually tilts backwards, and the upper ends of the left rear shelf side member III and the right rear shelf side member III are flexibly connected to the rotation point of the front upper part of the parallelogram frame, and move backwards and downwards. This backward and downward movement distance is greater than the backward and downward translation distance of the left shelf support member III and the right shelf support member III, which are respectively fixed to the left lower frame cross member and the right lower frame cross member. This downward and backward movement distance difference, plus the flexibly connected with the long grooves of the left and right shelf support members III and III, respectively, makes the left and right rear shelf side members III circle around the flexibly connected point of the front upper part of the parallelogram frame, and extend forward while rotating forwards; at the same time, the left rear shelf side member II I and the right rear shelf side piece III constitute the left push rod III and the right push rod III of the left and right motion moving pair, and move forward under the push of the left shelf support piece III and the right shelf support piece III respectively; the left push rod III and the right push rod III moving forward respectively push the left oblique piece III arranged on the left front shelf side piece III and the right oblique piece III arranged on the right front shelf side piece III, so that the left front shelf side piece III and the right front shelf side piece III rotate forward, and flip forward under the action of their own gravity and the left elastic piece III and the right elastic piece III, and are positioned by the left and right locating pins III arranged between the left and right rear shelf side pieces III and the left and right front shelf side pieces III, until the parallelogram frame is positioned at a certain position by the locating piece or the locking piece, so that the footrest III is extended forward, and the switching of the seat from a sitting position to a lying position is completed.

[0020] During the process of switching the seat from a lying position to a sitting position, the footrest device produces the following linkage: the entire parallelogram frame gradually resets forward, and the upper ends of the left rear shelf side piece III and the right rear shelf side piece III, which are movably connected to the rotation point of the front upper part of the parallelogram frame, move forward and upward, and this forward and upward movement distance is greater than the forward and upward translation distance of the left shelf support piece III and the right shelf support piece III, which are respectively fixed to the left lower frame cross piece and the right lower frame cross piece. This forward and upward movement distance difference, plus the upper ends of the left shelf support piece III and the right shelf support piece III, which are movably connected to the long grooves of the left rear shelf side piece III and the right rear shelf side piece III, respectively, make the left rear shelf side piece III and the right rear shelf side piece III revolve around the active connection point of the front upper part of the parallelogram frame, rotate backward and shrink downward; at the same time, the left rear shelf side piece III and the right rear shelf side piece III form a left-right motion moving pair When the left and right front shelf sides are rotated and retracted to a certain position, they touch the ground, so that the left and right front shelf sides form a certain angle with the left and right rear shelf sides, and respectively, and flip upward under the elastic force of the left elastic part III and the right elastic part III, until the parallelogram frame is locked in the sitting position by the locking part, and the footrest pad III is retracted again at the front lower part of the seat small assembly of the seat by the left and right shelf supports III, the left elastic part III and the right elastic part III, so as to be reset and complete the switching from lying position to sitting position.

[0021] In summary, the footrest device of a sitting and lying seat with a parallelogram as the main body provided by the present invention is an improvement and upgrade of the footrest methods of the three technical solutions of "telescopic sitting and lying dual-purpose office and study chair" with patent number ZL201721517914.0, "a telescopic sitting and lying dual-purpose chair" with patent number ZL201820336205.0, and "a main structure of a sitting and lying chair and a sitting and lying sofa with a movable locking device" with patent number ZL201920360712.2. On the basis of the above products, the motion characteristics of the main body mechanism are further utilized to realize the linkage of the seat back, seat seat, footrest device and armrest, and add a footrest device to meet the customer's comfort needs of lying on the back and lying on the side, and the feet need to be placed higher. Optimize the original product and expand the market application scope. Compared with the existing "lunch break chair", it is more convenient and reliable to operate, more stable to use, and more suitable for office workers' naps and short breaks.

[0022] The best implementation scheme of the present invention will be described below with reference to the accompanying drawings.

[0023] Figure 1 The left side schematic diagram is a footrest device of a sitting or lying seat with a parallelogram as the main structure;

[0024] Figure 2 for Figure 1 A schematic diagram of the footrest component of the unshown seat when it is in an extended state. DETAILED DESCRIPTION

[0025] The following is a detailed description of examples of the present invention in conjunction with the accompanying drawings.

[0026] See Figure 1 and Figure 2This example is mainly composed of a seat frame component 1 and a footrest component 2.The seat frame component 1 is mainly composed of a support component assembly 1-1 and a frame cross component assembly 2-1. The support component assembly 1-1 is a front support component 1-1-1 and a rear support component 2-1-1. The front support component 1-1-1 is composed of a left front support component 1-1-1-1, a right front support component 2-1-1-1, a front cross member 3-1-1-1 and a positioning member 4-1-1-1. One end of the front cross member 3-1-1-1 is fixedly connected to the left front support component 1-1-1-1, and the other end of the front cross member 3-1-1-1 is fixedly connected to the right front support component 2-1-1-1. One end of the positioning member 4-1-1-1 is fixedly connected to the left front support component 1-1-1-1, and the other end of the positioning member 4-1-1-1 is fixedly connected to the right front support component 2-1-1-1. The rear support assembly 2-1-1 is composed of a left rear support member 1-2-1-1, a right rear support member 2-2-1-1 and a rear cross member 3-2-1-1. One end of the rear cross member 3-2-1-1 is fixedly connected to the left rear support member 1-2-1-1, and the other end of the rear cross member 3-2-1-1 is fixedly connected to the right rear support member 2-2-1-1. The frame cross member assembly 2-1 is composed of a seat member subassembly 1-2-1, a left lower frame cross member 2-2-1 and a right lower frame cross member 3-2-1. The seat member subassembly 1-2-1 is composed of a left upper frame cross member 1-1-2-1, a right upper frame cross member 2-1-2-1 and a seat member 3-1-2-1. The left side of the seat member 3-1-2-1 is fixedly connected to the left upper frame cross member 1-1-2-1. The left side of the seat member 3-1-2-1 is fixedly connected to the left upper frame cross member 1-1-2-1. The right side is fixedly connected to the right upper frame cross member 2-1-2-1, the front end of the left upper frame cross member 1-1-2-1 is slidably connected to the upper end of the left front support member 1-1-1-1, the rear end of the left upper frame cross member 1-1-2-1 is rotatably connected to the left rear support member 1-2-1-1, the front end of the right upper frame cross member 1-1-2-1 is rotatably connected to the upper end of the right front support member 2-1-1-1, the rear end of the right upper frame cross member 1-1-2-1 is rotatably connected to the right rear support member 2-2-1-1, the front end of the left lower frame cross member 2-2-1 is rotatably connected to the left front support member 1-1-1-1, the rear end of the left lower frame cross member 2-2-1 is rotatably connected to the left rear support member 1-2-1-1, and the front end of the right lower frame cross member 3-2-1 is rotatably connected to the right front support member 2-1- 1-1, the rear end of the right lower frame cross member 3-2-1 is rotatably connected to the right rear support member 2-2-1-1, the four-bar mechanism composed of the left upper frame cross member 1-1-2-1, the left front support member 1-1-1-1, the left rear support member 1-2-1-1 and the left lower frame cross member 2-2-1 is a left parallelogram mechanism ZP, and the four-bar mechanism composed of the right upper frame cross member 1-1-2-1, the right front support member 2-1-1-1, the right rear support member 2-2-1-1 and the right lower frame cross member 3-2-1 is a right parallelogram mechanism YP, and the left parallelogram mechanism ZP and the right parallelogram mechanism YP are connected through the front cross member 3-1-1-1, the rear cross member 3-2-1-1 and the seat member 3-1-2-1 to form a parallelogram frame KP.The footrest component 2 is mainly composed of a shelf support member 1-2, a shelf side member 2-2 and a footrest pad 3-2. The shelf support member 1-2 is a left shelf support member 1-1-2 and a right shelf support member 2-1-2. The shelf side member 2-2 is a left shelf side member 1-2-2 and a right shelf side member 2-2-2. In this example, the shelf support member 1-2 is a shelf support member III1-2-III, the left shelf support member 1-1-2 is a left shelf support member III1-1-2-III, the right shelf support member 2-1-2 is a right shelf support member III2-1-2-III, and the shelf side member 2-2 is a shelf side member II I2-2-III, the shelf side parts III2-2-III are composed of the front shelf side parts III1-2-2-III and the rear shelf side parts III2-2-2-III, the front shelf side parts III1-2-2-III are divided into the left front shelf side parts III1-1-2-2-III and the right front shelf side parts III2-1-2-2-III, the rear shelf side parts III2-2-2-III are divided into the left rear shelf side parts III1-2-2-2-III and the right rear shelf side parts III2-2-2-2-III, the footrest 3-2 is the footrest III 3-2-III, the upper end of the left rear shelf side piece III1-2-2-2-III is rotatably connected to the left upper frame cross piece 1-1-2-1, the upper end of the right rear shelf side piece III2-2-2-2-III is rotatably connected to the right upper frame cross piece 2-1-2-1, the left rear shelf side piece III1-2-2-2-III and the right rear shelf side piece III2-2-2-2-III are both provided with a long groove C, one end of the left shelf support piece III1-1-2-III is fixedly connected to the left lower frame cross piece 2-2-1 of the parallelogram frame KP, The other end of the left shelf support member III1-1-2-III is slidably connected to the long groove C of the left rear shelf side member III1-2-2-2-III, one end of the right shelf support member III2-1-2-III is fixedly connected to the right lower frame cross member 3-2-1 of the parallelogram frame KP, the other end of the right shelf support member III2-1-2-III is slidably connected to the long groove C of the right rear shelf side member III2-2-2-2-III, and the left push rod IIIZT-III( is slidably connected to the long groove C of the left rear shelf side member III1-2-2-2-III. Figure 1 The left rear shelf side member III1-2-2-2-III and the left push rod IIIZT-III form a left motion moving pair, and the right rear shelf side member III2-2-2-2-III is slidably connected to the long groove C with the right push rod IIIYT-III ( Figure 1The right rear shelf side member III2-2-2-2-III and the right push rod IIIYT-III form a right motion moving pair, the other end of the left rear shelf side member III1-2-2-2-III is slidably connected to one end of the left front shelf side member III1-1-2-2-III, the other end of the right rear shelf side member III2-2-2-2-III is rotatably connected to one end of the right front shelf side member III2-1-2-2-III, and one end of the left front shelf side member III1-1-2-2-III is fixedly connected to the left oblique member IIIZX-III ( Figure 1 One end of the right front shelf side member III2-1-2-2-III is fixedly connected to the right oblique member IIIYX-III ( Figure 1 (as shown by the dotted line), one end of the left elastic member IIIZJ-III is connected to the left front shelf side member III1-1-2-2-III, the other end of the left elastic member IIIZJ-III is connected to the left rear shelf side member III1-2-2-2-III, one end of the right elastic member IIIYJ-III is connected to the right front shelf side member III2-1-2-2-III, the other end of the right elastic member IIIYJ-III is connected to the right rear shelf side member III2-2-2-2-III, a left positioning pin IIIZD-III is provided on the left rear shelf side member III1-2-2-2-III, a right positioning pin IIIYD-III is provided on the right rear shelf side member III2-2-2-2-III, and the footrest pad III3-2-III is fixedly connected to the left front shelf side member III1-1-2-2-III and the right front shelf side member III2-1-2-2-III. Figure 1 The figure shown by the double-dotted line below is the figure when lying down.

[0027] Through the above structure, the specific operation and action of an example of a footrest device for sitting or lying furniture with a parallelogram as the main body structure are as follows.

[0028] When the seat is in a sitting position, the footrest pad III3-2-III is contracted at the front lower part of the seat component 1-2-1 of the seat by the left support member III1-1-2-III, the right support member III2-1-2-III, the left elastic member IIIZJ-III and the right elastic member IIIYJ-III. When the seat is switched from a sitting position to a lying position, the footrest device produces the following linkage: the entire parallelogram frame KP tilts backward, and the upper ends of the left rear shelf side member III1-2-2-2-III and the right rear shelf side member III2-2-2-2-III respectively move backward and downward with the rotation points of the left upper frame cross member 1-1-2-1 and the right upper frame cross member 2-1-2-1, and this backward and downward movement distance is greater than the backward and downward translation distance of the left shelf support member III1-1-2-III and the right shelf support member III2-1-2-III respectively fixed to the left lower frame cross member 2-2-1 and the right lower frame cross member 3-2-1. The difference in the downward and backward movement distance, plus the upper ends of the left shelf support member III1-1-2-III and the right shelf support member III2-1-2-III and the long groove C of the left rear shelf side member III1-2-2-2-III and the right rear shelf side member III2-2-2-2-III, make the left rear shelf side member III1-2-2-2-III and the right rear shelf side member III2-2-2-2-III revolve around the rotation point of the left upper frame cross member 1-1-2-1 and the right upper frame cross member 2-1-2-1, rotate forward and extend forward at the same time; at the same time, together with the left rear shelf side member III1-2-2-2-III II and the right rear shelf side piece III2-2-2-2-III form a left push rod IIIZT-III and a right push rod IIIYT-III of the left and right motion moving pair, which move forward under the push of the left shelf support piece III1-1-2-III and the right shelf support piece III2-1-2-III respectively; the left push rod IIIZT-III and the right push rod IIIYT-III moving forward respectively push the left oblique piece IIIZX-III fixed on the left front shelf side piece III1-1-2-2-III and the right oblique piece IIIYX-III fixed on the right front shelf side piece III2-1-2-2-III. III, causing the left front shelf side piece III1-1-2-2-III and the right front shelf side piece III2-1-2-2-III to rotate forward and flip forward under the action of their own gravity and the elastic force of the left elastic piece IIIZJ-III and the right elastic piece IIIYJ-III until they are positioned by the left locating pin IIIZD-III on the left rear shelf side piece III1-2-2-2-III and the right locating pin IIIYD-III on the right rear shelf side piece III2-2-2-2-III, thereby extending the footrest III3-2-III forward and switching the seat from a sitting position to a lying position.

[0029] During the switching process of the seat from a lying position to a sitting position, the footrest device produces the following linkage: the entire parallelogram frame KP resets forward, and the upper ends of the left rear shelf side member III1-2-2-2-III and the right rear shelf side member III2-2-2-2-III respectively connect with the rotation points of the left upper frame cross member 1-1-2-1 and the right upper frame cross member 2-1-2-1 and move forward and upward, and this forward and upward movement distance is greater than the forward and upward translation distance of the left shelf support member III1-1-2-III and the right shelf support member III2-1-2-III respectively connected to the left lower frame cross member 2-2-1 and the right lower frame cross member 3-2-1. The difference in moving distances forward and upward, plus the structure of active connection with the upper ends of the left shelf support member III1-1-2-III and the right shelf support member III2-1-2-III and the long groove C of the left rear shelf side member III1-2-2-2-III and the right rear shelf side member III2-2-2-2-III, makes the left rear shelf side member III1-2-2-2-III and the right rear shelf side member III2-2-2-2-III revolve around the rotation point of the left upper frame cross member 1-1-2-1 and the right upper frame cross member 2-1-2-1, rotate backward and shrink downward; The left push rod IIIZT-III and the right push rod IIIYT-III of the left and right motion moving pairs of the components III2-2-2-2-III move backwards when the left shelf support component III1-1-2-III and the right shelf support component III2-1-2-III are pulled back; the left front shelf side component III1-1-2-2-III and the right front shelf side component III2-1-2-2-III rotate and retract together, and when the left front shelf side component III1-1-2-2-III and the right front shelf side component III2-1-2-2-III rotate and retract together to a certain position, they touch the ground, so that the left front shelf side component III1-1-2 -2-III and the right front shelf side piece III2-1-2-2-III form a certain angle with the left rear shelf side piece III1-2-2-2-III and the right rear shelf side piece III2-2-2-2-III respectively, and flip upward under the elastic force of the left elastic piece IIIZJ-III and the right elastic piece IIIYJ-III, and the footrest pad III3-2-III is retracted again by the left shelf support piece III1-1-2-III, the right shelf support piece III2-1-2-III, the left elastic piece IIIZJ-III and the right elastic piece IIIYJ-III to the front lower part of the seat component 1-2-1 of the seat to achieve restoration.

[0030] In summary, the footrest device of a sitting and lying seat with a parallelogram as the main body provided by the present invention is an improvement and upgrade of the footrest methods of the three technical solutions of "telescopic sitting and lying dual-purpose office and study chair" with patent number ZL201721517914.0, "a telescopic sitting and lying dual-purpose chair" with patent number ZL201820336205.0, and "a main structure of a sitting and lying chair and a sitting and lying sofa with a movable locking device" with patent number ZL201920360712.2. On the basis of the above products, the motion characteristics of the main body mechanism are further utilized to realize the linkage of the seat back, seat, footrest device and armrest, so as to achieve convenient, reliable and comfortable sitting and lying dual-purpose, change the use limitations of the original products, and expand the market application scope. Compared with the existing "lunch break chair", it is more convenient and reliable to operate, more stable to use, and more suitable for office workers' naps and short breaks.

Claims

1. A footrest device for a sitting or lying seat with a parallelogram as the main body structure, which is mainly composed of a seat frame component and a footrest component, and is characterized in that: The seat frame component (1) is mainly composed of a support component assembly (1-1) and a frame cross component assembly (2-1); the support component assembly (1-1) is a front support component (1-1-1) and a rear support component (2-1-1); the front support component (1-1-1) is composed of a left front support component (1-1-1-1), a right front support component (2-1-1-1) and a front cross member (3-1-1-1); one end of the front cross member (3-1-1-1) is fixedly connected to a suitable position of the left front support component (1-1-1-1); the other end of the front cross member (3-1-1-1) is fixedly connected to a suitable position of the right front support component (2-1-1-1); and the rear support component (2-1-1-1) is fixedly connected to a suitable position of the right front support component (2-1-1-1). The support assembly (2-1-1) is composed of a left rear support member (1-2-1-1), a right rear support member (2-2-1-1) and a rear cross member (3-2-1-1); one end of the rear cross member (3-2-1-1) is fixedly connected to a suitable position of the left rear support member (1-2-1-1); the other end of the rear cross member (3-2-1-1) is fixedly connected to a suitable position of the right rear support member (2-2-1-1); the frame cross member assembly (2-1) is composed of a seat subassembly (1-2-1), a left lower frame cross member (2-2-1) and a right lower frame cross member (3-2-1); the seat subassembly (1-2-1) is composed of a left upper frame cross member (1-1-2-1), a right upper frame cross member (3-2-1) and a right lower frame cross member (3-2-1). The frame is composed of a cross member (2-1-2-1) and a seat member (3-1-2-1), the left side of the seat member (3-1-2-1) is connected to the left upper frame cross member (1-1-2-1), the right side of the seat member (3-1-2-1) is connected to the right upper frame cross member (2-1-2-1), the front end of the left upper frame cross member (1-1-2-1) is rotatably connected to the upper end of the left front support member (1-1-1-1), the rear end of the left upper frame cross member (1-1-2-1) is rotatably connected to the appropriate position of the left rear support member (1-2-1-1), the front end of the right upper frame cross member (2-1-2-1) is rotatably connected to the upper end of the right front support member (2-1-1-1), and the rear end of the left upper frame cross member (1-1-2-1) is rotatably connected to the appropriate position of the left rear support member (1-2-1-1). The rear end of the right upper frame cross member (2-1-2-1) is rotatably connected to the appropriate position of the right rear support member (2-2-1-1); the front end of the left lower frame cross member (2-2-1) is rotatably connected to the appropriate position of the left front support member (1-1-1-1); the rear end of the left lower frame cross member (2-2-1) is rotatably connected to the appropriate position of the left rear support member (1-2-1-1); the front end of the right lower frame cross member (3-2-1) is rotatably connected to the appropriate position of the right front support member (2-1-1-1); the rear end of the right lower frame cross member (3-2-1) is rotatably connected to the appropriate position of the right rear support member (2-2-1-1);The four-bar mechanism composed of the left upper frame cross member (1-1-2-1), the left front support member (1-1-1-1), the left rear support member (1-2-1-1) and the left lower frame cross member (2-2-1) is a left parallelogram mechanism (ZP); the four-bar mechanism composed of the right upper frame cross member (2-1-2-1), the right front support member (2-1-1-1), the right rear support member (2-2-1-1) and the right lower frame cross member (3-2-1) is a right parallelogram mechanism (YP); the left parallelogram mechanism (ZP) and the right parallelogram mechanism (YP) are connected through the front cross member (3-1-1-1), The rear cross member (3-2-1-1) and the seat member (3-1-2-1) are connected to form a parallelogram frame (KP), a positioning member (4-1-1-1) is arranged at a suitable position of the parallelogram frame (KP), the footrest component (2) is mainly composed of a shelf support member (1-2), a shelf side member (2-2) and a footrest pad (3-2), the shelf support member (1-2) is a shelf support member III (1-2-III), the shelf support member III (1-2-III) is a left shelf support member III (1-1-2-III) and a right shelf support member III (2-1-2-III), the shelf side member (2-2) is a shelf side member I II (2-2-III), the shelf side piece III (2-2-III) is composed of a front shelf side piece III (1-2-2-III) and a rear shelf side piece III (2-2-2-III), the front shelf side piece III (1-2-2-III) is divided into a left front shelf side piece III (1-1-2-2-III) and a right front shelf side piece III (2-1-2-2-III), the rear shelf side piece III (2-2-2-III) is divided into a left rear shelf side piece III (1-2-2-2-III) and a right rear shelf side piece III (2-2-2-2-III), the footrest pad (3-2) is a footrest pad III (3-2-III), The upper end of the left rear shelf side member III (1-2-2-2-III) is rotatably connected to a suitable position of the upper front left portion of the parallelogram frame (KP); the upper end of the right rear shelf side member III (2-2-2-2-III) is rotatably connected to a suitable position of the upper front right portion of the parallelogram frame (KP); long grooves (C) are provided at suitable positions of the left rear shelf side member III (1-2-2-2-III) and the right rear shelf side member III (2-2-2-2-III); one end of the left shelf support member III (1-1-2-III) is fixedly connected to the left lower frame cross member (2-2-1) of the parallelogram frame (KP);The other end of the left shelf support member III (1-1-2-III) is movably connected to the long groove (C) of the left rear shelf side member III (1-2-2-2-III), one end of the right shelf support member III (2-1-2-III) is fixedly connected to the right lower frame cross member (3-2-1) of the parallelogram frame (KP), the other end of the right shelf support member III (2-1-2-III) is movably connected to the long groove (C) of the right rear shelf side member III (2-2-2-2-III), the long groove (C) of the left rear shelf side member III (1-2-2-2-III) is movably connected with a left push rod III (ZT-III), the left rear shelf side member III ( 1-2-2-2-III) and the left push rod III (ZT-III) form a left kinematic moving pair, the long groove (C) of the right rear shelf side piece III (2-2-2-2-III) is movably connected with a right push rod III (YT-III), the right rear shelf side piece III (2-2-2-2-III) and the right push rod III (YT-III) form a right kinematic moving pair, the other end of the left rear shelf side piece III (1-2-2-2-III) is movably connected to one end of the left front shelf side piece III (1-1-2-2-III), the other end of the right rear shelf side piece III (2-2-2-2-III) is movably connected to the right front shelf side piece III (2 -1-2-2-III), one end of the left front shelf side piece III (1-1-2-2-III) is rotatably connected, one end of the left front shelf side piece III (1-1-2-2-III) is provided with a left oblique piece III (ZX-III), one end of the right front shelf side piece III (2-1-2-2-III) is provided with a right oblique piece III (YX-III), one end of the left front shelf side piece III (1-1-2-2-III) is connected to a suitable position of one end of the left elastic piece III (ZJ-III), a suitable position of the left rear shelf side piece III (1-2-2-2-III) is connected to the other end of the left elastic piece III (ZJ-III), a suitable position of the right front shelf side piece III (2-1-2-2-III) is connected to a suitable position of the right front shelf side piece III (2-1-2-2-III). One end of the right elastic member III (YJ-III) is connected, the other end of the right elastic member III (YJ-III) is connected to the appropriate position of the right rear shelf side member III (2-2-2-2-III), a left positioning pin III (ZD-III) is provided at the appropriate position of the left rear shelf side member III (1-2-2-2-III), a right positioning pin III (YD-III) is provided at the appropriate position of the right rear shelf side member III (2-2-2-2-III), and the footrest pad III (3-2-III) is connected to the left front shelf side member III (1-1-2-2-III) and the right front shelf side member III (2-1-2-2-III).

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