Lumbar support seat

Abstract

The disclosure relates to the field of seat design and manufacture, in particular to a lumbar support seat. The disclosure is achieved by the following technical solution: a lumbar support seat, comprising a lumbar support and a gas spring; the lumbar support closely fits with the back of human body through the expansion of the gas spring when the back is moved, to provide continuous and uniform uplift force. An object of the disclosure is to overcome defects of the prior art and provide a lumbar support seat. When the user moves on the seat back and forth, the lumbar support may move synchronously in contact with the back of the human body, to fit with the waist in real time, thereby increasing the supporting force in waist position of the human body.

Claims

1. A seat with a lumbar support, comprising at least one lumbar support and a gas spring; the lumbar support configured to fit against a back of a human body through expansion of the gas spring when the back is moved relative to the seat, to provide a continuous and uniform support force; wherein the lumbar support comprises two lumbar supports, each configured to rotate in a horizontal direction; wherein the seat comprises a rotating shaft assembly and a transmission part associated with each lumbar support, the rotating shaft assembly comprises a spindle, and the associated lumbar support rotates about the spindle as an axis; wherein the rotation of the lumbar support is realized by expansion of the gas spring being transmitted through the transmission part; and wherein the extending direction of the gas spring is a horizontal front and back direction.

2. The seat with a lumbar support according to claim 1, wherein one end of the gas spring is connected with the transmission part; the transmission part is connected with the spindle; the spindle is connected with the lumbar support and drives the lumbar support to rotate.

3. The seat with a lumbar support according to claim 1, wherein one end of the gas spring is connected with the transmission part; the transmission part is connected with a rotating connector; the rotating connector is sleeved on the spindle; the rotating connector is connected with the lumbar support and drives the lumbar support to rotate.

4. The seat with a lumbar support according to claim 1, wherein the transmission part comprises a connecting arm connected to one end of the gas spring, a connecting rack connected to the connecting arm, and an oscillating gear connected with the rotating shaft assembly and meshed with the connecting rack.

5. The seat with a lumbar support according to claim 4, wherein the gas spring is installed below a seat cushion; the connecting arm is slidably connected below the seat cushion; an elongated groove is arranged on the connecting arm; the extending direction of the elongated groove is parallel to the telescopic direction of the gas spring; the lumbar support seat further comprises a pin connected with the seat cushion and movably embedded in the elongated groove.

6. The seat with a lumbar support according to claim 1, wherein the transmission part comprises a connecting piece connected with the gas spring, a roller connected to the connecting piece, a wire located in a wheel groove of the roller, and a rotating arm connected with the rotating shaft assembly; the wire is connected with the rotating arm.

7. The seat with a lumbar support according to claim 6, wherein the rotating arm is provided with a wire head bayonet; the wire is connected with the wire head bayonet.

8. The seat with a lumbar support according to claim 7, wherein the transmission part comprises a connecting arm connected with the gas spring, a rotating arm connected with the rotating shaft assembly and a connecting rod; both ends of the connecting rod are hinged with the connecting arm and the rotary arm, respectively.

9. The seat with a lumbar support according to claim 7, wherein the gas spring is installed below a seat cushion; the connecting arm is slidably connected below the seat cushion; an elongated groove is arranged on the connecting arm; the extending direction of the elongated groove is parallel to the telescopic direction of the gas spring; the lumbar support seat further comprises a pin connected with the seat cushion and movably embedded in the elongated groove.

10. The seat with a lumbar support according to claim 1, wherein the transmission part comprises a connecting arm connected with the gas spring, a sprocket connected to the connecting arm, a sprocket connector connected with the rotating shaft assembly and a chain; the chain is in meshing connection with the sprocket; the chain is in meshing connection with the sprocket connector.

11. The seat with a lumbar support according to claim 1, wherein the transmission part comprises a connecting arm connected with the gas spring, an oscillating pin arranged on the connecting arm, and a sleeve member sleeved on the spindle; the sleeve member is provided with an oscillating groove within which the oscillating pin slides.

12. The seat with a lumbar support according to claim 1, wherein the lumbar support comprises a swing arm, a supporting plate movably connected to the swing arm, and an angle adjustment unit for adjusting the preset angle of the supporting plate.

13. The seat with a lumbar support according to claim 12, wherein the angle adjustment unit is torsion spring.

14. The seat with a lumbar support according to claim 1, wherein the lumbar support is provided with a functional block.

15. The seat with a lumbar support according to claim 14, wherein the functional block is a magnetic block, an electric heating block or a massage block.

16. The seat with a lumbar support according to claim 1, further comprising a change-over switch assembly for switching an adjustment state and a locking state of the gas spring.

17. The seat with a lumbar support according to claim 16, wherein the gas spring is provided with a valve; the change-over switch assembly comprises an operating member, a cable connected with the operating member, and a pull rod connected with the cable; the pull rod is connected against the valve and is pulled away from the valve by the cable.

18. The seat with a lumbar support according to claim 1, wherein there are two rotating shaft assemblies which are located on both sides of a seat cushion; there are two lumbar supports which are individually connected to the rotating shaft assemblies, respectively.

19. The seat with a lumbar support according to claim 1, wherein there is one rotating shaft assembly which is located on one side of a seat cushion; there is one lumbar support which is connected to the rotating shaft assembly.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a front view of Embodiment I;

(2) FIG. 2 is a left view of FIG. 1;

(3) FIG. 3 is a top view of FIG. 1;

(4) FIG. 4 is a front view of Embodiment II;

(5) FIG. 5 is a left view of FIG. 4;

(6) FIG. 6 is a top view of FIG. 4;

(7) FIG. 7 is an enlarged view of area I in FIG. 1 and FIG. 4;

(8) FIG. 8 is an enlarged view of area II in FIG. 1 and FIG. 4;

(9) FIG. 9 is an enlarged view of area III in FIG. 2 and FIG. 5;

(10) FIG. 10 is an enlarged view of area IV in FIG. 3 and FIG. 6;

(11) FIG. 11 is an enlarged view of area V in FIG. 3;

(12) FIG. 12 is an enlarged view of area VI in FIG. 3 and FIG. 6;

(13) FIG. 13 is an enlarged view of area VII in FIG. 3 and FIG. 6;

(14) FIG. 14 is an enlarged view of area VIII in FIG. 3 and FIG. 6;

(15) FIG. 15 is an enlarged view of area IX in FIG. 6;

(16) FIG. 16 is a top view of Embodiment III;

(17) FIG. 17 is an enlarged detail view of area A in FIG. 16;

(18) FIG. 18 is a top view of Embodiment IV;

(19) FIG. 19 is an enlarged detail view of area A in FIG. 18;

(20) FIG. 20 is a side sectional view of area B in FIG. 18;

(21) FIG. 21 is a top view of Embodiment V;

(22) FIG. 22 is an enlarged detail view of area A in FIG. 21;

(23) FIG. 23 is a top view of Embodiment VI;

(24) FIG. 24 is an enlarged detail view of area A in FIG. 23;

(25) FIG. 25 is a side sectional view of area B in FIG. 23.

PREFERRED EMBODIMENT OF THE PRESENT DISCLOSURE

Embodiment 1

(26) As shown in FIG. 1, FIG. 2, FIG. 3, FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 11, FIG. 12, FIG. 13 and FIG. 14, a chair with a backrest that may closely fit with the back of the human body to move, comprising a chair leg assembly 1, a seat cushion 3, an armrest assembly 4 and a backrest 5. A rocker arm 8 is arranged on upper part of the casing 6 of the armrest assembly 4; a pivot pin 32 movably connected with the rear part of the backrest 5 is arranged on the front end of the rocker arm 8; a bottom plate 13 is fixed to the lower part of the seat cushion 3; the lower part of the bottom plate 13 is fixedly connected to the upper part of the chair leg assembly 1; a control rack 31 fixed at rear part in the bottom plate 13 is connected with the front part of a gas rod 12; a connecting pin 33 connected to one end of the connecting arm I 9 is arranged at tail of the gas rod 12; an oscillating pin 17 movably embedded in the oscillating groove 18 at the lower part of the casing 6 is arranged on another end of the connecting arm I 9.

(27) The backrest 5 is a separated two-piece structure.

(28) The lower part of the headrest 7 is connected to the lower part of the seat cushion 3.

(29) In the embodiment, the specific form of the sleeve member is a casing 6; the inner cavity of the casing 6 is provided with a spacer 15; the inner cavity of the spacer 15 is provided with a spindle 16; a connecting plate 19 fixedly connected to the bottom plate 13 is arranged on the lower part of the spindle 16; an armrest 2 is installed on the upper part of the spindle 16.

(30) A pin 10 is arranged in the bottom plate 13; an elongated groove 11 is arranged at the position corresponding to the pin 10 in the connecting arm I 9; the pin 10 is movably embedded in the elongated groove 11.

(31) A ratchet holder 23 with ratchet 24 is arranged on one side of the bottom plate 13; the ratchet holder 23 is provided with a rotating shaft 22 which is movably connected with a ratchet handle 26; the ratchet handle 26 is provided with a pawl pin 35 which is movably connected with a pawl 25; the pawl 25 is corresponding to the ratchet 24; the front end of the ratchet handle 26 is hooked with the tail end of the cable 21.

(32) The pawl handle 27 of the pawl 25 passes through the through hole 28 of the ratchet handle 26.

(33) The lower part of the pull rod 30 movably installed on the control rack 31 is hooked with the front end of the cable 21; the upper middle part of the pull rod 30 corresponds to the valve 29 of the gas rod 12.

(34) The exposed portion of the connecting arm I 9 and connecting plat 19 is wrapped by a shield 20.

Embodiment of the Present Disclosure

Embodiment 2

(35) As shown in FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 12, FIG. 13, FIG. 14 and FIG. 15, a chair includes a chair leg assembly 1, a seat cushion 3, an armrest assembly 4 and a backrest 5. A rocker arm 8 is arranged on upper part of the casing 6 of the armrest assembly 4; a pivot pin 32 movably connected with the rear part of the backrest 5 is arranged on the front end of the rocker arm 8; a bottom plate 13 is fixed to the lower part of the seat cushion 3; the lower part of the bottom plate 13 is fixedly connected to the upper part of the chair leg assembly 1; a control rack 31 fixed at rear part in the bottom plate 13 is connected with the front part of a gas rod 12; a connecting pin 33 connected to one end of the connecting arm I 9 is arranged at tail of the gas rod 12; an oscillating pin 17 movably embedded in the oscillating groove 18 at the lower part of the casing 6 is arranged on another end of the connecting arm I 9.

(36) The backrest 5 is a monoblock structure.

(37) The pivot pin 32 is embedded in and movably connected with the backrest elongated groove 34 at rear part of the backrest 5.

(38) The lower part of the headrest 7 is connected to the backrest 5.

(39) The inner cavity of the casing 6 is provided with a spacer 15; the inner cavity of the spacer 15 is provided with a spindle 16; a connecting plate 19 fixedly connected to the bottom plate 13 is arranged on the lower part of the spindle 16; an armrest 2 is installed on the upper part of the spindle 16.

(40) A pin 10 is arranged in the bottom plate 13; an elongated groove 11 is arranged at the position corresponding to the pin 10 in the connecting arm I 9; the pin 10 is movably embedded in the elongated groove 11.

(41) A ratchet holder 23 with ratchet 24 is arranged on one side of the bottom plate 13; the ratchet holder 23 is provided with a rotating shaft 22 which is movably connected with a ratchet handle 26; the ratchet handle 26 is provided with a pawl pin 35 which is movably connected with a pawl 25; the pawl 25 is corresponding to the ratchet 24; the front end of the ratchet handle 26 is hooked with the tail end of the cable 21.

(42) The pawl handle 27 of the pawl 25 passes through the through hole 28 of the ratchet handle 26.

(43) The lower part of the pull rod 30 movably installed on the control rack 31 is hooked with the front end of the cable 21; the upper middle part of the pull rod 30 corresponds to the valve 29 of the gas rod 12.

(44) The exposed portion of the connecting arm I 9 and connecting plat 19 is wrapped by a shield 20.

(45) In FIG. 8, the state of the pawl 25 and ratchet handle 26 is a static state of the backrest 5; when the backrest 5 needs to be moved in contact with the back of the human body, the ratchet handle 26 is moved upward along the rotating shaft 22, the through hole 28 drives the pawl handle 27 to move backwards, so that the pawl 25 is moved from the front engagement of the ratchet 24 to the rear engagement of the ratchet 24; the cable 21 is pulled simultaneously; the pull rod 30 is pulled by the cable 21 to open the valve 29; the compression spring in the gas rod 12 is extended to stretch the gas rod 12, and the connecting arm I 9 is driven by the connecting pin 33 to move forward along the elongated groove 11; at the same time, the casing 6 and rocker arm 8 are driven by the oscillating pin 17 and oscillating groove 18 to rotate around the spindle 16 in inward and forward mode; meanwhile, the backrest 5 is driven by the rocker arm 8 through the pivot pin 32 to move forward, to closely fit with the back of the human body. When the human body leans backwards, the back of the human body will backward push the backrest 5; the rocker arm 8 and casing 6 are driven by the backrest 5 through the pivot pin 32 to rotate around the spindle 16 in outward and backward mode; at the same time, the connecting arm I 9 is driven by the rocker arm 8 through the oscillating groove 18 and oscillating pin 17 to move backward along the elongated groove 11; meanwhile, the compression spring in the gas rod 12 is compressed by the connecting arm I 9 through the connecting pin 33, so that the gas rod 12 is shortened. During use, if the backrest 5 needs to stay at a certain position throughout the movement stroke, it should be pulled upward, and then the pawl handle 27 is laid down, so that the pawl 25 is moved from the rear engagement of the ratchet 24 to the front engagement of the ratchet 24; then the ratchet handle 26 is laid down along the rotating shaft 22, so as to loosen the cable 21 and pull rod 30 until the valve 29 is closed. Of course, for the chair with a backrest that may closely fit with the back of the human body to move in the disclosure, the gas rod 12 can be realized by using compression spring, extension spring, elastic rubber and so on. The schemes that the connecting arm I 9 is driven by an elastic structure through the connecting pin 33 to move along the elongated groove 11; at the same time, the casing 6 and rocker arm 8 are driven by the oscillating pin 17 and oscillating groove 18 to rotate around the spindle 16; meanwhile, the backrest 5 is driven by the rocker arm 8 through the pivot pin 32 to move shall fall within the protection scope of the disclosure.

(46) The differences between Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6 and Embodiment 1 lie in the specific structure of the transmission part 40.

(47) Specifically, Embodiment 3 is as shown in FIG. 16 and FIG. 17; the gas spring 12 can be directly installed below the seat cushion 3 or indirectly assembled below the seat cushion 3 through such connecting parts as bottom plate. The installation mode is not limited in the technical solution. The transmission realized through the gear and rack is an embodiment of the transmission part 40. Specifically, the gas spring 12 is extended to drive the connecting arm 41 to move forward; the end of the connecting arm 41 is connected to the connecting rack 42, to drive the connecting rack 42 to move forward; the oscillating gear 43 driven by the forward-moving connecting rack 42 is naturally rotated, to drive the lumbar support 5 to swing. The slotted direction of the elongated groove 11 is also the forward-backward direction; the pin 10 can be directly connected to the seat cushion 3 at a fixture such as bottom plate; the coordination between the pin 10 and the elongated groove 11 may increase the forward orientation and stability when the connecting arm 41 is pushed by the gas spring 12.

(48) In addition, the lumbar support 5 includes a swing arm 52, a supporting plate 51 movably connected with the swing arm 52, and a torsion spring for adjusting the preset angle of the supporting plate 51.

(49) The swing arm 52 can be directly connected or indirectly connected with the transmission part 40 (i.e., oscillating gear 43); the swing arm 52 is involved in swinging; a supporting plate 51 is connected to the swing arm 52; the supporting plate 51 is movably connected with the swing arm 52, that is, the supporting plate 51 may adjust the angle relative to the swing arm 52, so that the supporting plate 51 may flexibly and comfortably fit with the back of the human body.

(50) A torsion spring is arranged at the junction of the supporting plate 51 and the swing arm 52. The torsion spring has two functions: First, when the human body leans forward or backward, the torsion spring may provide a suitable torsion for the supporting plate 51, so that the angle adjustment of the supporting plate 51 is more flexible; secondly, when the human body leaves the seat, the torsion spring may automatically adjust the angle of the supporting plate 51 to a preset angle (for example, facing the front and non-tilting), so as to improve appearance and uniformity.

(51) The lumbar support 5 is provided with a functional block. The functional block is a magnetic block, an electric heating block or a massage block. The functional block is detachably installed on the lumbar support 5. Since the emphasis of the technical solution is that the lumbar support 5 may closely fit with the back of the human body, in addition to the supporting comfortability, the technical solution also includes the fitting degree of the healthy magnetic therapy. Manufacturers can add different functional blocks according to actual business needs, such as magnetic therapy, electric heating and massage, and can also produce multiple functional blocks by using a unified connection installation method, so that users can choose to replace and install the blocks.

(52) The lumbar support seat further includes a changeover switch assembly for switching the adjustment state and locking state of the gas spring 12. The change-over switch assembly is used for switching the state of the gas spring 12. When the gas spring 12 is in the adjustment state, the gas rod of the gas spring 12 can be freely extended and retracted. In this state, when the human body leans backward, the gas rod is retracted and lumbar support 5 swings backward; when the human body leans forward, the gas rod is extended and lumbar support 5 swings forward. When the gas spring 12 is in the locking state, the extension length of the gas rod is locked, and the lumbar support 5 is also fixed and does not swing back and forth.

Embodiment 4

(53) As shown in FIG. 18, FIG. 19 and FIG. 20, the difference between Embodiment 4 and Embodiment 3 also lies in the specific structure of the transmission part 40. In Embodiment 4, the transmission part 40 includes a connecting piece 46 connected with the gas spring 12, a roller 44 connected to the connecting piece 46, a drawn wire 45 located in a wheel groove of the roller 44, and a rotating arm 47 connected with the rotating shaft assembly; the drawn wire 45 is connected with the rotating arm 47. The rotating arm 47 is provided with a wiredrawing head bayonet 48; the drawn wire 45 is connected with the wiredrawing head bayonet 48.

(54) The coordination between the drawn wire 45 and the roller 44 is another specific embodiment of the transmission part 40. Specifically, the forward-moving gas spring 12 drives the connecting piece 46 to move forward; the connecting piece 46 may be connected with the roller 44 through fixtures such as a pin. A roller 44 is connected to the connecting piece 46; a drawn wire 45 is installed on the roller 44, to form a forward-stretching motion of the drawn wire 45; the drawn wire 45 pulls the rotating arm 47 to rotate.

Embodiment 5

(55) As shown in FIG. 21 and FIG. 22, the difference between Embodiment 5 and Embodiment 3 also lies in the specific structure of the transmission part 40. In Embodiment 5, the transmission part 40 includes a connecting arm 41 connected with the gas spring 12, a rotating arm 47 connected with the rotating shaft assembly and a connecting rod 49; both ends of the connecting rod 49 are hinged with the connecting arm 41 and the rotary arm 47, respectively. The gas spring 12 is installed below the seat cushion 3; the connecting arm 41 is slidably connected below the seat cushion 3; an elongated groove 11 is arranged on the connecting arm 41; the extending direction of the elongated groove 11 is parallel to the telescopic direction of the gas spring 12; the lumbar support seat further includes a pin 10 connected with the seat cushion 3 and movably embedded in the elongated groove 11.

(56) The method of using the rotating arm 47 and the connecting rod 49 is another specific embodiment of the transmission part 40. Specifically, the gas spring 12 is extended to drive the connecting arm 41 to move forward; the connecting arm 41 is hinged with a connecting rod 49; the other end of the connecting rod 49 is hinged with a rotating arm 47. When the connecting arm 41 moves forward, the rotating arm 47 is driven to rotate by the connecting rod 49; the rotating arm 47 rotates about the spindle 16.

Embodiment 6

(57) As shown in FIG. 23, FIG. 24 and FIG. 25, the difference between Embodiment 6 and Embodiment 3 also lies in the specific structure of the transmission part 40. In Embodiment 6, the transmission part 40 includes a connecting arm 41 connected with the gas spring 12, a sprocket 412 connected to the connecting arm 41, a sprocket connector 413 connected with the rotating shaft assembly and a chain 411; the chain 411 is in meshing connection with the sprocket 412; the chain 411 is in meshing connection with the sprocket connector 413.

(58) The method of using the gear and chain is another specific embodiment of the transmission part 40. Specifically, a connecting arm 41 is connected to the gas spring 12; a sprocket 412 is connected to the connecting arm 41; the chain 411 is in meshing connection with the sprocket 412. When the gas spring 12 is extended, the chain 411 is pulled forward; the other end of the chain 411 is meshed with the sprocket connector 413, to drive the sprocket connector 413 to swing around the spindle 16. In this manner, the technical solution that the chain 411 is matched with the sprocket 412 can also be replaced by a common cooperation scheme of the synchronous belt and synchronous pulley, and the principle is the same.

INDUSTRIAL APPLICABILITY

(59) According to the disclosure, the lumbar support, gas spring, transmission part and other parts of the seat can be connected to form a lumbar support seat product, which can be put into mass production by matching the assembly line.