阅读说明：本技术 一种便于收放组合的折叠式按摩沙发 (Folding massage sofa convenient to receive and release combination ) 是由 王金龙 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种便于收放组合的折叠式按摩沙发,涉及按摩沙发技术领域,解决了目前使用的按摩沙发一般不具备大幅度提升高度的功能,一般即使调整高度范围也不能超过沙发的自身高度的问题。一种便于收放组合的折叠式按摩沙发,包括底座,所述底座的主体为L形结构,底座的后侧转折结构与底座滑动连接；底座的顶部通过铰连接旋转设置有四组主连杆,底座顶部的两组主连杆和两侧两组主连杆的位置相反,通过设置有主连杆的设置,提供了大幅度提升高度的功能,两侧主连杆同步运动调整能够保持沙发座的位置平衡,并且主连杆的升高高度大幅度超过了沙发座的高度,能够根据场地和使用人员的不同需求快速适应调整,适用性强。(The invention discloses a folding massage sofa convenient to fold and unfold and combine, relates to the technical field of massage sofas, and solves the problems that the currently used massage sofa generally does not have the function of greatly improving the height and generally cannot exceed the height of the sofa even if the height range is adjusted. A folding massage sofa convenient to fold and unfold and combine comprises a base, wherein the main body of the base is of an L-shaped structure, and a rear side folding structure of the base is connected with the base in a sliding manner; the top of base connects the rotation through the hinge and is provided with four sets of main connecting rods, and the position of two sets of main connecting rods at base top and two sets of main connecting rods in both sides is opposite, through the setting that is provided with main connecting rod, provides the function that promotes height by a wide margin, and the both sides main connecting rod simultaneous movement adjustment can keep the position balance of sofa seat to the rising height of main connecting rod has surpassed the height of sofa seat by a wide margin, can be according to the quick adaptation adjustment of place and user of different demands, and the suitability is strong.)

1. The utility model provides a foldable massage sofa convenient to receive and release combination which characterized in that includes:

the main body of the base is of an L-shaped structure, and the rear turning structure of the base is connected with the base in a sliding manner; the top of the base is rotatably provided with four groups of main connecting rods through hinged connection, and the two groups of main connecting rods at the top of the base are opposite to the two groups of main connecting rods at two sides;

the middle of the bottom of the sofa seat is of a hollow structure, four groups of main connecting rods are rotatably arranged at the bottom of the sofa seat through hinged connection, and the positions of two groups of main connecting rods in the middle of the bottom of the sofa seat are opposite to those of two groups of main connecting rods at two sides of the sofa seat; the top of the sofa seat is fixedly provided with a cushion; one end of the upper and lower main connecting rods is rotatably connected through a reinforcing shaft;

the back plate is rotatably arranged at the top of the sofa seat through hinge connection, and the connection position is positioned at the rear side of the sofa seat; the bottom edge of the rear side of the back plate is arranged to be a 45-degree inclined plane structure;

and the lifting connecting rod is rotatably arranged on the right side of the sofa seat through a rotating shaft.

2. The foldable massage sofa easy to be folded and unfolded for assembly as claimed in claim 1, wherein said sofa seat further comprises:

the middle of the bottom of the sofa seat is fixedly provided with a sliding piece, and two sides of the sliding piece are provided with dovetail grooves;

the front end of the sofa seat is fixedly provided with a T-shaped frame; a flat shaft frame is fixedly arranged at the rear end of the sofa seat, and two groups of lead screws A are rotatably arranged between the T-shaped frame and the two sides of the flat shaft frame;

the screw nut blocks are arranged in two groups, and the two groups of screw nut blocks are matched with the dovetail grooves and are arranged on two sides of the sliding piece in a sliding mode; the nut block is in threaded connection with the screw A; one side of the nut block is rotatably provided with a main connecting rod through hinge connection, and the other end of the main connecting rod outside the nut block is rotatably connected with the reinforcing shaft.

3. The foldable massage sofa of claim 2, wherein the sofa base further comprises:

the middle of the front side of the T-shaped frame is rotatably provided with a synchronous shaft; the two ends of the synchronizing shaft are in transmission connection with the bevel gears arranged on the two groups of screw rods A:

the auxiliary shaft A is rotatably arranged on the left side of the rear end of the sofa seat, and the auxiliary shaft A is in transmission connection with a left lead screw A through a bevel gear;

the auxiliary shaft B is rotatably arranged on the left side of the sofa seat and is in transmission connection with the auxiliary shaft A through a bevel gear;

the front end of the left side of the sofa seat is rotatably provided with a hand wheel shaft A, and the hand wheel shaft A and the auxiliary shaft B are in bevel gear transmission connection.

4. The foldable massage sofa convenient for folding and unfolding combination as claimed in claim 1, wherein the back plate further comprises:

the top of the back plate is fixedly provided with a sealing cover;

the middle of the back plate is rotatably provided with a cam shaft, cam pieces are fixedly arranged outside the cam shaft, and the angles of the two adjacent cam pieces are opposite.

5. The foldable massage sofa convenient for folding and unfolding combination as claimed in claim 4, wherein the back plate further comprises:

the right side inside the back plate is integrally provided with a narrow channel, and the narrow channel is internally and rotatably provided with a driven shaft; a motor is fixedly arranged on the right side of the front end of the back plate and is in transmission connection with the driven shaft; the driven shaft is in transmission connection with a camshaft provided with a bevel gear; the bottom surface of the backboard is a spongy cushion.

6. The foldable massage sofa of claim 1, wherein the lifting linkage further comprises:

the other end of the lifting connecting rod is rotatably provided with a self-locking piece through a hinged joint, and the middle of the self-locking piece is provided with a round hole;

the tooth piece, the fixed two sets of spring levers that are provided with in top of tooth piece, the bottom both sides from the latch fitting set up to protruding structure, and the spring lever cover establishes the spring and passes the both sides protruding structure from the latch fitting from the bottom.

7. The foldable massage sofa convenient for folding and unfolding as claimed in claim 1, wherein two sets of sliding strips are fixedly arranged on the right side of the sofa seat, and the self-locking member is slidably arranged on the outer sides of the sliding strips; a screw B is rotatably arranged on the right side of the sofa seat and penetrates through the middle through hole of the self-locking piece; the slide bar still includes:

the screw sliding block is arranged outside the sliding strip in a sliding mode and is in threaded connection with the lead screw B.

8. The foldable massage sofa convenient for folding and unfolding as claimed in claim 1, wherein a row of teeth is fixedly arranged below the right side of the sofa seat, the tooth surface of the row of teeth faces upwards, and the ground of the tooth block is matched and attached with the row of teeth.

9. The foldable massage sofa convenient for folding and unfolding combination as claimed in claim 1, wherein the right front end of the sofa seat is rotatably provided with a hand wheel shaft B, and the hand wheel shaft B is in bevel gear transmission connection with a screw B; the outer sides of the hand wheel shaft B and the hand wheel shaft A are both fixedly provided with an oval handle.

Technical Field

The invention relates to the technical field of massage sofas, in particular to a folding massage sofa convenient to fold and unfold and combine.

Background

The sofa is a backrest chair with a cushion such as a spring or thick foam, and a massage sofa is used according to the development requirements of the manufacturing industry, and is often provided with a folding structure for convenient storage and movement.

Through retrieving for example, patent No. CN209629163U discloses a foldable sofa with massage structure, which comprises a sofa base, wherein a storage drawer groove is formed on the surface of the sofa base, the surface of the storage drawer groove is movably connected with a storage drawer, the interior of the sofa base is fixedly connected with an air supply pump, one side of the sofa base far away from the air supply pump is fixedly connected with a sofa support column, one side of the sofa base close to the air supply pump is movably connected with a sofa air cushion, and one side of the sofa base close to the sofa air cushion is fixedly connected with a sofa positioning column. This foldable sofa with massage structure opens sealed lid through the manpower, emits the gas in the sofa air cushion, and rethread manpower rotation adjustment handle, the rotation of adjustment handle atress and directional piece no longer the joint, rethread manpower is with the surface of sofa back folding to sofa base for sofa back and sofa base are folding to be a square, thereby reach the effect that makes things convenient for people to accomodate and transport the sofa.

Similar to the above application, mousse hair has the following disadvantages:

firstly, the massage sofa used at present generally does not have the function of greatly increasing the height, and generally the height of the massage sofa cannot exceed the height of the sofa even if the height is adjusted; second, there are no mechanical restraint structures to precisely adjust and define the sofa deployment angle, and no auxiliary control structures to facilitate adjustment.

Therefore, the folding massage sofa does not meet the existing requirements, and the folding massage sofa convenient to fold and unfold and combine is provided for the people.

Disclosure of Invention

Problem (A)

The invention aims to provide a folding massage sofa convenient to fold, unfold and combine, and aims to solve the problems that the prior massage sofa does not have the function of greatly improving the height generally, and the height of the massage sofa cannot exceed the height of the sofa generally even if the height is adjusted; second, there is no problem of a mechanical restriction structure for precisely adjusting and defining the unfolding angle of the sofa, and an auxiliary control structure for facilitating adjustment.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a folding massage sofa convenient to fold and unfold and combine comprises a base, wherein the main body of the base is of an L-shaped structure, and a rear side folding structure of the base is connected with the base in a sliding manner; the top of the base is rotatably provided with four groups of main connecting rods through hinged connection, and the two groups of main connecting rods at the top of the base are opposite to the two groups of main connecting rods at two sides; the middle of the bottom of the sofa seat is of a hollow structure, four groups of main connecting rods are rotatably arranged at the bottom of the sofa seat through hinged connection, and the positions of two groups of main connecting rods in the middle of the bottom of the sofa seat are opposite to those of two groups of main connecting rods at two sides of the sofa seat; the top of the sofa seat is fixedly provided with a cushion; one end of the upper and lower main connecting rods is rotatably connected through a reinforcing shaft; the back plate is rotatably arranged at the top of the sofa seat through hinge connection, and the connection position is positioned at the rear side of the sofa seat; the bottom edge of the rear side of the back plate is arranged to be a 45-degree inclined plane structure; and the lifting connecting rod is rotatably arranged on the right side of the sofa seat through a rotating shaft.

Preferably, the sofa seat further comprises: the middle of the bottom of the sofa seat is fixedly provided with a sliding piece, and two sides of the sliding piece are provided with dovetail grooves; the front end of the sofa seat is fixedly provided with a T-shaped frame; a flat shaft frame is fixedly arranged at the rear end of the sofa seat, and two groups of lead screws A are rotatably arranged between the T-shaped frame and the two sides of the flat shaft frame; the screw nut blocks are arranged in two groups, and the two groups of screw nut blocks are matched with the dovetail grooves and are arranged on two sides of the sliding piece in a sliding mode; the nut block is in threaded connection with the screw A; one side of the nut block is rotatably provided with a main connecting rod through hinge connection, and the other end of the main connecting rod outside the nut block is rotatably connected with the reinforcing shaft.

Preferably, the sofa seat further comprises: the middle of the front side of the T-shaped frame is rotatably provided with a synchronous shaft; two ends of the synchronizing shaft are in transmission connection with two groups of lead screws A through bevel gears; the auxiliary shaft A is rotatably arranged on the left side of the rear end of the sofa seat, and the auxiliary shaft A is in transmission connection with a left lead screw A through a bevel gear; the auxiliary shaft B is rotatably arranged on the left side of the sofa seat and is in transmission connection with the auxiliary shaft A through a bevel gear; the front end of the left side of the sofa seat is rotatably provided with a hand wheel shaft A, and the hand wheel shaft A and the auxiliary shaft B are in bevel gear transmission connection.

Preferably, the back plate further comprises: the top of the back plate is fixedly provided with a sealing cover; the middle of the back plate is rotatably provided with a cam shaft, cam pieces are fixedly arranged outside the cam shaft, and the angles of the two adjacent cam pieces are opposite.

Preferably, the back plate further comprises: the right side inside the back plate is integrally provided with a narrow channel, and the narrow channel is internally and rotatably provided with a driven shaft; a motor is fixedly arranged on the right side of the front end of the back plate and is in transmission connection with the driven shaft; the driven shaft is in transmission connection with a camshaft provided with a bevel gear; the bottom surface of the backboard is a spongy cushion.

Preferably, the lifting link further comprises: the other end of the lifting connecting rod is rotatably provided with a self-locking piece through a hinged joint, and the middle of the self-locking piece is provided with a round hole; the tooth piece, the fixed two sets of spring levers that are provided with in top of tooth piece, the bottom both sides from the latch fitting set up to protruding structure, and the spring lever cover establishes the spring and passes the both sides protruding structure from the latch fitting from the bottom.

Preferably, two groups of sliding strips are fixedly arranged on the right side of the sofa seat, and the self-locking piece is arranged on the outer sides of the sliding strips in a sliding manner; a screw B is rotatably arranged on the right side of the sofa seat and penetrates through the middle through hole of the self-locking piece; the slide bar still includes: the screw sliding block is arranged outside the sliding strip in a sliding mode and is in threaded connection with the lead screw B.

Preferably, a tooth row is fixedly arranged below the right side of the sofa seat, the tooth surface of the tooth row faces upwards, and the ground of the tooth block is matched and attached with the tooth row.

Preferably, the front end of the right side of the sofa seat is rotatably provided with a hand wheel shaft B, and the hand wheel shaft B is in transmission connection with a lead screw B through a bevel gear; the outer sides of the hand wheel shaft B and the hand wheel shaft A are both fixedly provided with an oval handle.

(III) advantageous effects

The invention provides a folding massage sofa convenient to fold and unfold and combine, which is provided with a function of greatly improving the height by arranging main connecting rods, the synchronous motion adjustment of the main connecting rods on two sides can keep the position balance of a sofa seat, the lifting height of the main connecting rods greatly exceeds the height of the sofa seat, the sofa seat can be quickly adapted and adjusted according to different requirements of places and users, the applicability is strong, when the base and the sofa seat are stored, the main connecting rods can be stored and hidden between the base and the sofa seat, an adjusting mechanism is positioned on one side of the sofa seat, the relative distance between the sofa seat and the users is kept along with the lifting of the sofa seat, and the manual input is convenient.

The arrangement of the screw sliding block and the self-locking piece provides a mechanical limiting structure for accurately adjusting and limiting the unfolding angle of the sofa, when the sofa sits flatly, the back plate can be directly opened, the self-locking piece is driven to move by the lifting connecting rod in the rotating process of the back plate, the tooth block is matched with the spring rod to be in elastic contact with the tooth row to realize self-locking in the moving process of the self-locking piece, and meanwhile, the screw sliding block limits the movable position of the self-locking piece, so that the upper limit of the rotation of the back plate is limited; the hand wheel shaft B and the lead screw B are rotated, the lead screw B pushes the nut slide block through thread transmission, the upper limit angle of the lying seat can be lifted, and compared with the whole-course control and whole-course self-locking mode, the combination of the limit control and the self-locking is more convenient to fold and unfold.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is a schematic diagram of an axial structure according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of a disassembled structure in an embodiment of the present invention;

FIG. 4 is a schematic side view of the main body of the embodiment of the present invention;

FIG. 5 is a schematic view of the internal transmission structure of the sofa seat according to the embodiment of the present invention;

FIG. 6 is an enlarged partial structural view of part A in the embodiment of the present invention;

FIG. 7 is an enlarged partial structural view of a portion B in the embodiment of the present invention;

FIG. 8 is an enlarged view of a portion C according to an embodiment of the present invention;

in fig. 1 to 8, the correspondence between the part names or lines and the reference numbers is:

1. a base; 2. a main link; 201. reinforcing the shaft; 3. a sofa seat; 301. a slider; 302. a T-shaped frame; 303. a flat shaft bracket; 304. a lead screw A; 305. a nut block; 306. a synchronizing shaft; 307. an auxiliary shaft A; 308. an auxiliary shaft B; 309. a hand wheel shaft A; 4. a cushion; 5. a back plate; 501. sealing the cover; 502. a camshaft; 503. a cam member; 504. a driven shaft; 505. a motor; 6. a lifting link; 601. a self-locking member; 602. a tooth block; 603. a spring lever; 7. a slide bar; 701. a nut slide block; 8. a lead screw B; 9. a tooth row; 10. and a hand wheel shaft B.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 8, an embodiment of the present invention includes: a folding massage sofa convenient to fold and unfold and combine comprises a base 1, wherein the main body of the base 1 is of an L-shaped structure, and a rear side folding structure of the base 1 is in sliding connection with the base 1; the top of the base 1 is rotatably provided with four groups of main connecting rods 2 through hinge connection, and the two groups of main connecting rods 2 at the top of the base 1 are opposite to the two groups of main connecting rods 2 at the two sides; the middle of the bottom of the sofa seat 3 is of a hollow structure, four groups of main connecting rods 2 are rotatably arranged at the bottom of the sofa seat 3 through hinged connection, and the positions of the two groups of main connecting rods 2 in the middle of the bottom of the sofa seat 3 are opposite to those of the two groups of main connecting rods 2 at two sides; the top of the sofa seat 3 is fixedly provided with a cushion 4; one end of the upper and lower main connecting rods 2 is rotatably connected through a reinforcing shaft 201; the back plate 5 is rotatably arranged at the top of the sofa seat 3 through hinge connection, and the connection position is positioned at the rear side of the sofa seat 3; the bottom edge of the rear side of the back plate 5 is set to be a 45-degree inclined plane structure; and the lifting connecting rod 6 is rotatably arranged on the right side of the sofa seat 3 through a rotating shaft.

Wherein, sofa seat 3 still includes: the slider 301 is fixedly arranged in the middle of the bottom of the sofa seat 3, and dovetail grooves are formed in two sides of the slider 301; the T-shaped frame 302, the front end of the sofa seat 3 is fixedly provided with the T-shaped frame 302; a flat shaft frame 303 is fixedly arranged at the rear end of the sofa seat 3, and two groups of lead screws A304 are rotatably arranged between the T-shaped frame 302 and the two sides of the flat shaft frame 303; the number of the screw blocks 305 is two, and the two screw blocks 305 are matched with dovetail grooves and are arranged on two sides of the slider 301 in a sliding manner; the nut block 305 is in threaded connection with a lead screw A304; one side of the nut block 305 is rotatably provided with a main connecting rod 2 through hinge connection, and the other end of the main connecting rod 2 outside the nut block 305 is rotatably connected with the reinforcing shaft 201; a synchronizing shaft 306, wherein the middle of the front side of the T-shaped frame 302 is rotatably provided with the synchronizing shaft 306; two ends of the synchronizing shaft 306 are in transmission connection with two groups of lead screws A304 through bevel gears; the auxiliary shaft A307 is rotatably arranged on the left side of the rear end of the sofa seat 3, and the auxiliary shaft A307 is in transmission connection with a left lead screw A304 through a bevel gear; an auxiliary shaft B308 is rotatably arranged on the left side of the sofa seat 3, and the auxiliary shaft B308 and an auxiliary shaft A307 are in bevel gear transmission connection; the hand wheel shaft A309 is rotatably arranged at the front end of the left side of the sofa seat 3, and the hand wheel shaft A309 and the auxiliary shaft B308 are in bevel gear transmission connection.

Referring to fig. 5, the main link 2 is provided to provide a base for lifting, and the length of the two main links 2 is overlapped to exceed the length of the sofa body, and the main link 2, the nut block 305 and the slider 301 form a slider structure, so that the control of the interval between the base 1 and the sofa seat 3 can be realized.

Wherein, backplate 5 still includes: the sealing cover 501 is fixedly arranged at the top of the back plate 5; the camshaft 502 is rotatably arranged in the middle of the back plate 5, cam pieces 503 are fixedly arranged outside the camshaft 502, and the angles of two adjacent groups of cam pieces 503 are opposite; a narrow channel is integrally formed in the right side of the inner part of the driven shaft 504, and the driven shaft 504 is rotationally arranged in the narrow channel; a motor 505 is fixedly arranged on the right side of the front end of the back plate 5, and the motor 505 is in transmission connection with a driven shaft 504; the driven shaft 504 is in bevel gear transmission connection with the camshaft 502; the bottom surface of the backboard 5 is a spongy cushion.

Referring to fig. 7, a massage function is provided by providing a cam member 503, and a starting motor 505 rotates a driven shaft 504, further rotating each set of cam shafts 502 through bevel gears, and the massage function can be provided by utilizing the curved surface contact of the cam member 503.

Wherein, lifting link 6 still includes: the other end of the lifting connecting rod 6 is rotatably provided with a self-locking piece 601 through a hinge connection, and the middle of the self-locking piece 601 is provided with a round hole; the spring locking device comprises a tooth block 602, wherein two groups of spring rods 603 are fixedly arranged at the top of the tooth block 602, protruding structures are arranged on two sides of the bottom of a self-locking piece 601, and the spring rods 603 are sleeved with springs and penetrate through the protruding structures on two sides of the self-locking piece 601 from the bottom; two groups of sliding strips 7 are fixedly arranged on the right side of the sofa seat 3, and the self-locking piece 601 is arranged on the outer sides of the sliding strips 7 in a sliding manner; a lead screw B8 is rotatably arranged on the right side of the sofa seat 3, and a lead screw B8 penetrates through a middle through hole of the self-locking piece 601; the slide bar 7 also comprises: the screw slider 701 is arranged outside the slide bar 7 in a sliding mode, and the screw slider 701 is in threaded connection with a lead screw B8; a tooth row 9 is fixedly arranged below the right side of the sofa seat 3, the tooth surface of the tooth row 9 faces upwards, the ground of the tooth block 602 is matched and attached with the tooth row 9, a hand wheel shaft B10 is rotatably arranged at the front end of the right side of the sofa seat 3, and a bevel gear is arranged between the hand wheel shaft B10 and a lead screw B8 for transmission connection; the outer sides of the hand wheel shaft B10 and the hand wheel shaft A309 are both fixedly provided with an oval handle.

Referring to fig. 6, a sliding block structure is formed by arranging the lifting connecting rod 6, the self-locking piece 601 and the sliding strip 7, and then the nut sliding block 701 and the tooth row 9 are arranged to provide a limiting structure, the nut sliding block 701 can intercept the position of the self-locking piece 601, and the tooth block 602 and the spring rod 603 can be in self-locking contact with the tooth row 9, so that short-distance control limitation on the sofa is realized.

The working principle is as follows: when needing to promote, rotate hand wheel axle A309, hand wheel axle A309 passes through the bevel gear and drives the rotation of assisting axle B308, it is rotatory that supplementary axle B308 drives supplementary axle A307 through the bevel gear, it is rotatory that supplementary axle A307 drives left side lead screw A304 through the bevel gear, lead screw A304 cooperation synchronizing shaft 306 drives another group lead screw A304 simultaneously, two sets of lead screw A304 are rotatory to different directions, move two groups nut block 305 to different directions, the node of different positions owner connecting rod 2 is closed up simultaneously, constitute slider-crank mechanism, promote sofa seat 3 by the even lifting sofa seat 3 of both sides, raise sofa seat 3, the lifting height of sofa seat 3 surpasss sofa seat 3's height by a wide margin this moment, can realize the high power lift.

The starting motor 505 drives the driven shaft 504 to rotate, and further drives each set of cam shafts 502 to rotate through the bevel gears, and a massage function can be provided by utilizing the curved surface contact of the cam part 503.

When sitting flatly, directly open backplate 5 can, drive from locking piece 601 and remove through lifting connecting rod 6 at the rotatory in-process of backplate 5, the in-process tooth piece 602 cooperation spring beam 603 that removes realizes the auto-lock with tooth row 9 elastic contact at self-locking piece 601, screw slider 701 restriction from the movable position of locking piece 601 simultaneously, and then restriction backplate 5 is rotatory upper limit, and rotate hand wheel axle B10 and lead screw B8, lead screw B8 promotes the upper limit angle that the seat of lying can be promoted through screw drive propulsion screw slider 701.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.