Automatic retractable waist support

Abstract

The present invention discloses an automatic telescopic lumbar support, comprising a lumbar support body, a base, and a telescopic mechanism, wherein the telescopic mechanism is arranged between the lumbar support body and the base, wherein the lumbar support body comprises a main lumbar support body and a secondary lumbar support body, wherein a groove is provided in the middle of the main lumbar support body, wherein the secondary lumbar support body is arranged in the groove, wherein a mounting opening is provided at the bottom of the groove, wherein a travel switch is arranged in the mounting opening, wherein a contact of the travel switch is arranged at the bottom of the secondary lumbar support body. The distance between the lumbar support body and the base is adjusted by the telescopic mechanism, and by judging whether the secondary lumbar support body squeezes the contact of the travel switch, it is automatically judged whether the lumbar support body is in contact with the waist of the human body, thereby enabling the lumbar support body to automatically adjust the distance between the lumbar support body and the back of the human body according to the needs of the user, thereby improving the comfort level and application scope of the device.

Description

Technical Field

[0001] The invention relates to the field of lumbar supports, and in particular to an automatic telescopic lumbar support. Background Art

[0002] Chairs are a kind of furniture that is widely used in daily life and work. They are generally composed of a base, a backrest, a supporting structure, armrests and other parts. At the same time, in order to meet more needs of people and bring a more comfortable experience, the structure and function of the chair are constantly improving. At present, in order to provide good support for the waist, more and more seats with lumbar supports are appearing. However, the applicant found that when people sit on the chair, some people like to sit forward, while others like to sit backward. The existing lumbar supports on the market cannot automatically adjust the distance between the lumbar support and the user's waist according to the needs of each user, which greatly reduces the applicability of the lumbar support. Therefore, it is necessary to propose a lumbar support that can automatically adjust forward and backward according to user needs. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the background technology and provide an automatic telescopic lumbar support. The above technical purpose of the present invention is achieved through the following technical solutions:

[0004] An automatic telescopic lumbar support comprises a lumbar support body, a base, and a telescopic mechanism, wherein the telescopic mechanism is arranged between the lumbar support body and the base, the lumbar support body comprises a main lumbar support body and a secondary lumbar support body, a groove is provided in the middle of the main lumbar support body, the secondary lumbar support body is arranged in the groove, a mounting opening is provided at the bottom of the groove, a travel switch is arranged in the mounting opening, and a contact of the travel switch is arranged at the bottom of the secondary lumbar support body.

[0005] The main lumbar support body and the auxiliary lumbar support body are both concave arc surfaces, so that the lumbar support body is adapted to the body curve of the human body and the comfort is enhanced. The auxiliary lumbar support body is arranged in the middle of the main lumbar support body, so that the auxiliary lumbar support body is located at the lowest point of the main lumbar support body, thereby enhancing the accuracy of judging whether the lumbar support is in contact with the human body.

[0006] Preferably, two guide holes are provided at the bottom of the groove, and the two guide holes are located on two opposite sides of the mounting opening. A guide shaft capable of passing through the guide holes is formed at the bottom of the secondary lumbar support body, and the secondary lumbar support body is kept in a forward and backward state on the main lumbar support body through the guide shaft, so as to prevent misalignment and displacement.

[0007] Preferably, the guide shaft is provided with a spring fixing block, a compression spring, a retaining ring, a tension spring, and a tension spring fixing block in sequence from top to bottom, the spring fixing block is fixedly connected to the side wall of the guide shaft, the retaining ring is slidably connected to the guide shaft, the tension spring is fixedly connected to the side wall of the guide shaft, the compression spring is arranged between the spring fixing block and the retaining ring, and the tension spring is arranged between the retaining ring and the tension spring fixing block. When the secondary lumbar support body squeezes the travel switch, the guide shaft moves downward to drive the compression spring to compress and the tension spring to stretch at the same time. Through the pulling and contraction of the spring, the buffering force is increased when the secondary lumbar support body is squeezed, so that the secondary lumbar support body is squeezed slowly during the squeezing process, thereby improving the squeezing comfort of the user. At the same time, the spring plays an anti-vibration role, which can reduce the inertia of the secondary lumbar support during movement and avoid misoperation. When resetting, due to the action of the bidirectional spring, the lumbar drag quickly returns to its original state.

[0008] Preferably, the outer wall of the retaining ring is formed with an annular groove along its circumferential direction, and clamping strips are clamped on opposite sides of the annular groove, one end of the two clamping strips presses against the inner wall of the guide hole, and the other end penetrates the inner wall of the guide hole and extends outside the guide hole, and the clamping strip is fixedly connected with an anti-dropping block on the outer wall of the guide hole. The clamping strip is clamped into the annular groove so that the retaining ring is fixed in the guide hole and will not move, and the clamping of the clamping strip makes installation convenient.

[0009] Preferably, the lumbar support body is provided with a fixing plate extending downward from the bottom of the mounting opening, a mounting column is fixedly connected to the side wall of the fixing plate, and mounting holes that cooperate with the mounting columns are formed on the travel switch, so that the travel switch can be fixed on the mounting opening through the mounting columns, which is convenient for installation.

[0010] Preferably, the telescopic mechanism includes two scissor-type structures, a driving assembly, a first guide shaft, a second guide shaft, a third guide shaft, a fourth guide shaft and a fifth guide shaft, the scissor-type structure includes a first rod and a second rod arranged crosswise, the first guide shaft passes through the center position of the first rod and the second rod and is movably connected thereto, the second guide shaft passes through the bottom ends of the two first rods and is movably connected thereto, the third guide shaft passes through the top ends of the two first rods and is movably connected thereto, the fourth guide shaft passes through the bottom ends of the two second rods and is movably connected thereto, the fifth guide shaft passes through the top ends of the two second rods and is movably connected thereto, and the lumbar support body is located at the top of the first rod. A mounting ear is provided at the position of the end, a first waist-shaped slide groove is provided at the position of the lumbar support body located at the top end of the second rod, a second waist-shaped slide groove is provided at the position of the base located at the bottom end of the first rod, a rod mounting hole is provided at the position of the base located at the bottom end of the second rod, the third guide shaft is movably connected to the mounting ear, the fifth guide shaft is slidably connected to the first waist-shaped slide groove, the second guide shaft is slidably connected to the second waist-shaped slide groove, the fourth guide shaft is movably connected to the rod mounting hole, and the second guide shaft is pushed by the driving assembly, thereby driving the movement of the two first rods and the second rod, realizing scissor-like extension and retraction, thereby achieving the purpose of automatically adjusting the distance between the base and the lumbar support body.

[0011] Preferably, the driving assembly includes a motor, a screw rod and a limit seat, the screw rod is arranged at the output end of the motor, the limit seat is arranged at the end of the screw rod, a guide shaft limit groove is formed at the end of the limit seat away from the screw rod, the base is provided with a slide groove along the length direction of the screw rod, and the bottom of the limit seat is provided with a slider that cooperates with the slide groove. The rotation of the screw rod is controlled by the motor, thereby driving the limit seat to move along the direction of the slide groove, thereby controlling the movement of the second guide shaft.

[0012] Preferably, a connecting block is sleeved and fixed on the end of the screw rod, and a placement groove is formed on the limit seat for facilitating the placement of the connecting block. A through hole is provided on the connecting block, and a connecting block mounting hole that cooperates with the through hole is provided in the placement groove. The detachable connection between the limit seat and the screw rod is achieved by screws passing through the through hole and the connecting block mounting hole.

[0013] Preferably, a forward travel switch and a backward travel switch are provided on the base, and the forward travel switch and the backward travel switch are located on both sides of the limit seat. A forward stopper cooperating with the forward travel switch is provided on the limit seat, and a backward stopper cooperating with the backward travel switch is provided on the limit seat. When the limit seat is in the process of moving forward, the forward stopper contacts the forward travel switch to prevent excessive forward movement; when the limit seat is in the process of moving backward, the backward stopper contacts the backward travel switch to prevent excessive backward movement, thereby controlling the adjustment range of the distance between the lumbar support body and the base.

[0014] Preferably, an extrusion surface travel switch is provided on the side of the forward stop block travel switch close to the forward travel switch and on the side of the reverse stop block travel switch close to the reverse travel switch. The extrusion surface travel switch is inclined inward from one end close to the limit seat travel switch to the end away from the limit seat travel switch. Through the inclined setting, the forward stop block and the reverse stop block can complete the purpose of squeezing the contacts of the travel switch during the movement of the limit seat.

[0015] In summary, the beneficial effects of the present invention are:

[0016] 1. The present invention adjusts the distance between the lumbar support body and the base by extending and retracting the telescopic mechanism, and automatically determines whether the lumbar support body is in contact with the waist of the human body by judging whether the auxiliary lumbar support body squeezes the contact of the travel switch, so that the lumbar support body can automatically adjust the distance between the lumbar support body and the back of the human body according to the needs of the user, thereby improving the comfort and application range of the device;

[0017] 2. The present invention increases the buffering force when the secondary lumbar support body is squeezed by the spring pulling and contracting, so that the secondary lumbar support body is squeezed slowly during squeezing, which improves the squeezing comfort of the user. At the same time, the spring plays a role of shock resistance, which can reduce the inertia of the secondary lumbar support during movement and avoid misoperation. When resetting, due to the action of the bidirectional spring, the lumbar support quickly returns to its original state;

[0018] 3. The present invention controls the adjustment range of the distance between the lumbar support body and the base by causing the forward stopper to contact the forward travel switch to prevent excessive forward movement, and the backward stopper to contact the backward travel switch to prevent excessive backward movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a schematic diagram of the main lumbar support body of the present invention;

[0021] Figure 3 It is a bottom schematic diagram of the main lumbar support body of the present invention;

[0022] Figure 4 is a schematic diagram of a base of the present invention;

[0023] Figure 5 is a schematic top view of the base of the present invention;

[0024] Figure 6 It is a cross-sectional schematic diagram between the auxiliary lumbar support body and the guide shaft of the present invention;

[0025] Figure 7 It is a schematic diagram of the auxiliary lumbar support body of the present invention after squeezing the travel switch;

[0026] Figure 8 It is a cross-sectional schematic diagram of the connection between the clamping strip and the retaining ring of the present invention. DETAILED DESCRIPTION

[0027] The following specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

[0028] The present invention will be described in detail below with reference to the accompanying drawings by way of embodiments.

[0029] Example:

[0030] like Figure 1-8As shown, an automatic telescopic lumbar support comprises a lumbar support body 1, a base 2, and a telescopic mechanism 3. The telescopic mechanism 3 is arranged between the lumbar support body 1 and the base 2. The lumbar support body 1 comprises a main lumbar support body 11 and a secondary lumbar support body 12. A groove 111 is provided in the middle of the main lumbar support body 11. The secondary lumbar support body 12 is arranged in the groove 111. A mounting opening 112 is provided at the bottom of the groove 111. A travel switch 4 is provided in the mounting opening 112. The contact of the travel switch 4 is arranged at the bottom of the secondary lumbar support body 12. Two guide holes 113 are provided at the bottom of the groove 111. The two guide holes 113 are located on opposite sides of the mounting opening 112. The bottom of the secondary lumbar support body 12 is formed with a hole that can be passed through. The guide shaft 121 passes through the guide hole 113, the lumbar support body 1 is located at the bottom of the installation port 112 and extends downward with a fixing plate 115, and the side wall of the fixing plate 115 is fixedly connected with a mounting column 116, and the travel switch 4 is formed with a mounting hole 41 that cooperates with the mounting column 116. The telescopic mechanism 3 includes two scissor-type structures 31, a driving assembly 32, a first guide shaft 33, a second guide shaft 34, a third guide shaft 35, a fourth guide shaft 36 and a fifth guide shaft 37. The scissor-type structure 31 includes a first rod 311 and a second rod 312 arranged crosswise, and the first guide shaft 33 passes through the center position of the first rod 311 and the second rod 312 and is movably connected thereto. The second guide shaft 34 passes through the bottom ends of the two first rods 311 and is movably connected thereto, the third guide shaft 35 passes through the top ends of the two first rods 311 and is movably connected thereto, the fourth guide shaft 36 passes through the bottom ends of the two second rods 312 and is movably connected thereto, the fifth guide shaft 37 passes through the top ends of the two second rods 312 and is movably connected thereto, the lumbar support body 1 is provided with a mounting ear 13 at the position of the top end of the first rod 311, the lumbar support body 1 is provided with a first waist-shaped slide groove 14 at the position of the top end of the second rod 312, the base 2 is provided with a second waist-shaped slide groove 15 at the position of the bottom end of the first rod 311, the base 2 is provided with a second waist-shaped slide groove 15 at the position of the second rod 3 A rod mounting hole 16 is provided at the bottom end of 12, the third guide shaft 35 is movably connected to the mounting ear 13, the fifth guide shaft 37 is slidably connected to the first waist-shaped slide groove 14, the second guide shaft 34 is slidably connected to the second waist-shaped slide groove 15, the fourth guide shaft 36 is movably connected to the rod mounting hole 16, the driving assembly 32 includes a motor 321, a screw rod 322 and a limit seat 323, the screw rod 322 is arranged at the output end of the motor 321, the limit seat 323 is arranged at the end of the screw rod 322, a guide shaft limit groove 324 is formed at one end of the limit seat 323 away from the screw rod 322, and a slide groove 325 is provided on the base 2 along the length direction of the screw rod 322.The bottom of the limit seat 323 is provided with a slider 326 that cooperates with the slide groove 325, and a connecting block 327 is fixedly mounted on the end of the screw rod 322. The limit seat 323 is formed with a placement groove 328 for placing the connecting block 327. The connecting block 327 is provided with a through hole, and the placement groove 328 is provided with a connecting block mounting hole 329 that cooperates with the through hole. The base 2 is provided with a forward stroke switch 21 and a backward stroke switch 22. The switch 22 is located on both sides of the limit seat 323. The limit seat 323 is provided with a forward stopper 23 that cooperates with the forward travel switch 21. The limit seat 323 is provided with a backward stopper 24 that cooperates with the backward travel switch 22. The side of the forward stopper 23 close to the forward travel switch 21 and the side of the backward stopper 24 close to the backward travel switch 22 are both provided with an extrusion surface 231. The extrusion surface 231 is inclined inward from one end close to the limit seat 323 to one end away from the limit seat 323.

[0031] like Figure 6-8 As shown, the guide shaft 121 is provided with a spring fixing block 122, a compression spring 124, a retaining ring 123, a tension spring 125, and a tension spring fixing block 126 from top to bottom, the spring fixing block 122 is fixedly connected to the side wall of the guide shaft 121, the retaining ring 123 is slidably connected to the guide shaft 121, the tension spring 125 is fixedly connected to the side wall of the guide shaft 121, the compression spring 124 is provided between the spring fixing block 122 and the retaining ring 123, the tension spring 125, and the tension spring fixing block 126 The spring 125 is arranged between the retaining ring 123 and the tension spring fixing block 126. The outer wall of the retaining ring 123 is formed with an annular groove 127 along its circumferential direction. The annular groove 127 has clamping strips 128 on opposite sides. One end of the two clamping strips 128 is pressed against the inner wall of the guide hole 113, and the other end passes through the inner wall of the guide hole 113 and extends to the outside of the guide hole 113. The clamping strip 128 is located on the outer wall of the guide hole 113 and is fixedly connected with an anti-slip block 129.

[0032] The lumbar support device of the present invention can be placed on the back of a seat, and a pressure sensor is provided on the seat cushion, through which it is determined whether a person is sitting on the seat.

[0033] During the whole process, the pressure sensor, motor and travel switch are all controlled by the controller to achieve automation. The controller controls the pressure sensor, travel switch and motor. This is a very mature technology, so it will not be elaborated in this case.

[0034] The working principle of the structure of the present invention is:

[0035] like Figure 1-8As shown, when in use, the automatic telescopic lumbar support is placed on the back of the chair, and the lumbar support body 1 faces the human body. When the human body sits on the seat cushion, the pressure sensor detects a message, and the controller controls the motor 32. The motor 32 controls the rotation of the screw rod 322, thereby driving the limit seat 323 to move along the direction of the slide groove 325, thereby controlling the movement of the second guide shaft 34, thereby driving the two first rods 311 and the second rod 312 to move, so that the arc surface of the secondary lumbar support body 12 contacts the back of the human body, resulting in that when the human body squeezes the secondary lumbar support body 12, the bottom of the secondary lumbar support body 12 squeezes the touch switch 4 The controller receives the information and determines that the lumbar support body 1 has come into contact with the waist of the human body, thereby controlling the motor 32 to stop rotating, thereby controlling the scissor-type structure 31 to stop moving, thereby completing the automatic adjustment of the distance between the lumbar support body and the back of the human body, and improving the comfort and application range of the device. When the human body gets up from the chair, the pressure sensor loses gravity, and the controller controls the motor 32, and controls the rotation of the screw rod 322 through the motor 32, thereby driving the limit seat 323 to move, thereby driving the movement of the two first rods 311 and the second rod 312, so that the lumbar support body 1 returns to its original position, which is convenient for the next adjustment.

[0036] During the whole process, when the secondary lumbar support body 12 squeezes the travel switch, the spring pulls and contracts to increase the buffering force when the secondary lumbar support body 12 is squeezed, so that the secondary lumbar support body is squeezed slowly, which improves the user's squeezing comfort. During reset, due to the action of the bidirectional spring, the lumbar support quickly returns to its original state.

Claims

1. An automatic retractable lumbar support, characterized in that: The invention comprises a lumbar support body (1), a base (2), and a telescopic mechanism (3), wherein the telescopic mechanism (3) is arranged between the lumbar support body (1) and the base (2), wherein the lumbar support body (1) comprises a main lumbar support body (11) and a secondary lumbar support body (12), wherein a groove (111) is provided in the middle of the main lumbar support body (11), wherein the secondary lumbar support body (12) is arranged in the groove (111), wherein a mounting opening (112) is provided at the bottom of the groove (111), wherein a travel switch (4) is arranged in the mounting opening (112), wherein a contact of the travel switch (4) is arranged at the bottom of the secondary lumbar support body (12), and wherein the main lumbar support body and the secondary lumbar support body both form an inwardly concave arc surface; The groove bottom of the groove (111) is provided with two guide holes (113), and the two guide holes (113) are located on opposite sides of the mounting opening (112). The bottom of the secondary waist support body (12) is formed with a guide shaft (121) capable of passing through the guide hole (113). The guide shaft (121) is provided with a spring fixing block (122), a compression spring (124), a retaining ring (123), a tension spring (125), and a tension spring fixing block (126) in order from top to bottom. The spring fixing block (122) is fixedly connected to the side wall of the guide shaft (121), the retaining ring (123) is slidably connected to the guide shaft (121), and the tension spring (125) is slidably connected to the guide shaft (121). The side walls are fixedly connected, the compression spring (124) is arranged between the spring fixing block (122) and the retaining ring (123), the tension spring (125) is arranged between the retaining ring (123) and the tension spring fixing block (126), the outer wall of the retaining ring (123) is formed with an annular groove (127) along its circumferential direction, and the annular groove (127) is clamped with a clamping strip (128) on both opposite sides, one end of the two clamping strips (128) is pressed against the inner wall of the guide hole (113), and the other end passes through the inner wall of the guide hole (113) and extends to the outside of the guide hole (113), and the clamping strip (128) is fixedly connected with an anti-slip block (129) on the outer wall of the guide hole (113).

2. The automatic retractable lumbar support according to claim 1, characterized in that: The waist support body (1) is provided with a fixing plate (115) extending downward from the bottom of the mounting opening (112), a mounting column (116) is fixedly connected to the side wall of the fixing plate (115), and a mounting hole (41) cooperating with the mounting column (116) is formed on the travel switch (4).

3. The automatic retractable lumbar support according to claim 1, characterized in that: The telescopic mechanism (3) comprises two scissor-type structures (31), a driving assembly (32), a first guide shaft (33), a second guide shaft (34), a third guide shaft (35), a fourth guide shaft (36) and a fifth guide shaft (37); the scissor-type structure (31) comprises a first rod (311) and a second rod (312) arranged crosswise; the first guide shaft (33) passes through the center of the first rod (311) and the second rod (312) and is movably connected thereto; the second guide shaft (34) passes through the bottom ends of the two first rods (311) and is movably connected thereto; the third guide shaft (35) passes through the top ends of the two first rods (311) and is movably connected thereto; the fourth guide shaft (36) passes through the bottom ends of the two second rods (312) and is movably connected thereto; the fifth guide shaft (37) passes through the bottom ends of the two second rods (312) and is movably connected thereto; The waist support body (1) is provided with a mounting ear (13) at a position located at the top of the first rod (311), the waist support body (1) is provided with a first waist-shaped slide groove (14) at a position located at the top of the second rod (312), the base (2) is provided with a second waist-shaped slide groove (15) at a position located at the bottom of the first rod (311), the base (2) is provided with a rod mounting hole (16) at a position located at the bottom of the second rod (312), the third guide shaft (35) is movably connected to the mounting ear (13), the fifth guide shaft (37) is slidably connected to the first waist-shaped slide groove (14), the second guide shaft (34) is slidably connected to the second waist-shaped slide groove (15), and the fourth guide shaft (36) is movably connected to the rod mounting hole (16).

4. The automatic retractable lumbar support according to claim 3, characterized in that: The driving assembly (32) comprises a motor (321), a screw rod (322) and a limit seat (323); the screw rod (322) is arranged at the output end of the motor (321); the limit seat (323) is arranged at the end of the screw rod (322); a guide shaft limit groove (324) is formed at one end of the limit seat (323) away from the screw rod (322); a slide groove (325) is provided on the base (2) along the length direction of the screw rod (322); and a slider (326) is provided at the bottom of the limit seat (323) and cooperates with the slide groove (325).

5. The automatic retractable lumbar support according to claim 4, characterized in that: A connecting block (327) is sleeved and fixed on the end of the screw rod (322), a placement groove (328) is formed on the limiting seat (323) for facilitating the placement of the connecting block (327), a through hole is provided on the connecting block (327), and a connecting block mounting hole (329) that cooperates with the through hole is provided in the placement groove (328).

6. The automatic telescopic lumbar support according to claim 5, characterized in that: The base (2) is provided with a forward travel switch (21) and a backward travel switch (22), the forward travel switch (21) and the backward travel switch (22) are located on both sides of the limit seat (323), the limit seat (323) is provided with a forward stopper (23) cooperating with the forward travel switch (21), and the limit seat (323) is provided with a backward stopper (24) cooperating with the backward travel switch (22).

7. The automatic retractable lumbar support according to claim 6, characterized in that: A side of the forward stopper (23) close to the forward travel switch (21) and a side of the backward stopper (24) close to the backward travel switch (22) are both provided with an extrusion surface (231), and the extrusion surface (231) is inclined inwardly from an end close to the limit seat (323) to an end away from the limit seat (323).

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