JP4153248B2 - Lumber support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a seat back frame having left and right longitudinal members, and a pair of vertical frame members positioned inside the left and right longitudinal members of the seat back frame, and between these pair of vertical frame members, A plurality of lateral spring members are connected, and are supported rotatably between a flat mat elastically supported in the seat back frame via the spring members and left and right longitudinal members of the seat back frame. The present invention relates to a lumbar support device having a drive rod and a pair of arm means having one end fixed to the drive rod and the other end engageable with a vertical frame member of the flat mat.
[0002]
[Prior art]
First, a description will be given with reference to FIG. The seat back frame 10 has longitudinal members 11 on its left and right sides, and a transverse member 12 is connected to the upper end of the longitudinal member 11. The flat mat 20 located in the seat back frame 10 has a flat plate shape as a whole, and has an outer frame body having left and right vertical frame members 21 and a lower frame member 22 connecting the left and right vertical frame members 21. A plurality of lateral spring members 24 are connected between the left and right vertical frame members 21. The left and right vertical frame members 21 of the flat mat 20 and the left and right vertical members 11 of the seat back frame 10 are connected via tension coil springs 25, respectively.
[0003]
As shown in FIGS. 5 and 6, the drive rod 30 is rotatably supported below the left and right longitudinal members 11 of the seat back frame 10. A motor bracket 31 is fixed to one of the left and right longitudinal members 11, and a motor 32 that drives the drive rod 30 is fixed to the motor bracket 31.
[0004]
A pinion 32 b is fixed to the output shaft of the motor 32. On the other hand, a sector gear 33 is welded and fixed to the end of the drive rod 30 located on the motor bracket 31 side, and the sector gear 33 meshes with the pinion 32b. Therefore, when the output shaft is driven to rotate forward and backward via the motor 32, the drive rod 30 is reciprocally rotated via the pinion 32b and the sector gear 33.
[0005]
The drive rod 30 is provided with a pair of arm means 39 that can be engaged with the vertical frame member 21 of the flat mat 20 on the left and right sides thereof.
The arm means 39 will be described with reference to FIGS. Corresponding to the vertical frame member 21 of the flat mat 20, the base end portions of the pair of arm members 40 are fixed to the drive rod 30 using pins 46.
[0006]
On the other hand, a pair of flat mat brackets (hereinafter referred to as flat mat BKT) 50 is fixed to the left and right vertical frame members 21 of the flat mat 20 (see FIG. 7).
The flat mat BKT 50 is rotatably attached using a pin 64 to an extrusion link 60 rotatably attached to the arm member 40 using a pin 63.
[0007]
Therefore, by rotating the drive rod 30, the arm member 40 is rotated, and the flat mat 20 is taken in and out toward the back of the seated person via the push-out link 60.
[0008]
[Problems to be solved by the invention]
However, when assembling the lumbar support device having the above-described configuration, assuming that the width A of the vertical frame member 21 of the flat mat 20 and the width B of the arm member 40 (see FIG. 5), the case of A = B is ideal.
[0009]
However, due to variations in component accuracy,
(1) In the case of A <B, the flat mat 20 is attached in the width direction in a state where the flat mat 20 is spread against the elastic repulsion force of the plurality of lateral spring members 24, and attachment is difficult.
(2) In the case of A> B, the flat mat 20 is attached in the width direction in a contracted state against the elastic repulsive force of the plurality of transverse spring members 24, and attachment is difficult.
[0010]
Further, since the plurality of lateral spring members 24 are attached in a contracted state, the tension of the flat mat 20, particularly the tension at the center in the width direction of the flat mat 20, is eliminated, and the foreign material feeling due to the vertical frame member 21 of the flat mat 20 is eliminated. Increases and makes you feel uncomfortable.
[0011]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a lumbar support device that is easy to assemble and has good sitting comfort.
[0012]
[Means for Solving the Problems]
The invention according to claim 1, which solves the above problem, includes a seat back frame having left and right longitudinal members, and a pair of vertical frame members positioned inside the left and right longitudinal members of the seat back frame, A plurality of first lateral spring members are connected between the pair of vertical frame members, a flat mat elastically supported in the seat back frame via the spring members, and left and right sides of the seat back frame A drive rod rotatably supported between the longitudinal members, and a pair of arm means having one end fixed to the drive rod and the other end being engageable with the vertical frame member of the flat mat; in lumbar support device having, the said portion of the arm means is engaged flat mat, provided with the first transverse spring member non-installation region in which the first transverse spring member is not provided, the pair Each of the arm means is attached to an arm member whose base end portion is fixed to the drive rod so as not to be rotatable, and to the distal end portion of the arm member so as to be rotatable about an axis parallel to the axial direction of the drive rod. constituted by the bracket, and further, the two brackets are connected by a second transverse spring member in the state extending from the natural state, the second transverse spring member, by rotation of the drive rod, A lumbar support device capable of abutting against the vertical frame member .
According to a second aspect of the present invention, in the lumbar support device according to the first aspect, the second lateral spring member can contact the pair of vertical frame members at a plurality of locations. is there.
The invention according to claim 3 is the lumbar support device according to claim 1 or 2, wherein the lateral spring member is provided so that the two brackets rotate in synchronization.
[0013]
The engagement between the pair of arm means and the vertical frame member of the flat mat is a contact by a second lateral spring member provided so as to connect the brackets of the pair of arm means. There is no need to mount the mat in the width direction in a state where the mat is expanded or contracted against the elastic repulsion force of the plurality of first lateral spring members, and the mounting becomes easy.
[0014]
Further, a non-spring installation area where the first lateral spring member is not provided is provided in the vicinity of the portion of the flat mat where the arm means engages, and the flat mat is provided so as to connect the brackets of the pair of arm means. The second lateral spring member thus provided is provided in a state extended from the natural state, so that the tension in the center portion in the width direction of the flat mat is secured, and the feeling of foreign matter due to the vertical frame material of the flat mat is poor, and the comfort is poor. It will never be.
[0015]
Furthermore, the brackets of the pair of arm means are attached to the distal ends of the arm members so as to be rotatable about an axis parallel to the axial direction of the drive rod. Compared with the case where these brackets are respectively fixed to the arm members, the range in which the lateral spring member attached so as to rotate the drive rod and connect the brackets to the vertical frame member of the flat mat is the bracket. However, the present invention in which the arm member is rotatably attached to the distal end portion of the arm member becomes smaller. Therefore, the seating feeling is improved.
[0016]
Further, since the connecting member provided so that the two brackets rotate synchronously is also used as the lateral spring member, the number of parts can be reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
First, the overall configuration of the present embodiment will be described with reference to FIG. The seat back frame 110 has longitudinal members 111 on its left and right sides. The flat mat 120 located in the seat back frame 110 has a flat plate shape as a whole, and includes an outer frame body having left and right vertical frame members 121 and a lower frame member 122 connecting the left and right vertical frame members 121. A plurality of lateral spring members (formed wires formed by bending a wire) 124 are connected between the left and right vertical frame members 121. The left and right vertical frame members 121 of the flat mat 120 and the left and right vertical members 111 of the seat back frame 110 are connected via tension coil springs 125, respectively.
[0018]
Next, an invention part is demonstrated using FIGS. 1-3. A drive rod 130 is rotatably disposed below the left and right vertical members 111 of the seat back frame 110. A motor bracket 131 is fixed to one of the left and right longitudinal members 111, and a motor 132 that drives the drive rod 130 is fixed to the motor bracket 131.
[0019]
A pinion 132 b is fixed to the output shaft of the motor 132. On the other hand, a sector gear 133 is fixed by welding to the end of the drive rod 130 located on the motor bracket 131 side, and the sector gear 133 meshes with the pinion 132b. Accordingly, when the output shaft is driven to rotate forward and backward via the motor 132, the drive rod 130 is reciprocally rotated via the pinion 132b and the sector gear 133.
[0020]
The drive rod 130 is provided with a pair of arm means 139 that can be engaged with the vertical frame member 121 of the flat mat 120 on the left and right sides thereof.
In the present embodiment, a spring non-installation region X where the lateral spring member 124 is not provided is provided in the vicinity of the portion of the flat mat 120 where the arm means 139 engages.
[0021]
The arm means 139 will be described. Corresponding to the vertical frame member 121 of the flat mat 120, the base ends of the pair of arm members 140 are fixed to the drive rod 130 using pins 146. A bending flange portion 140a is formed along the periphery on the distal end side of the arm member 140, but a bending flange portion is not formed on the periphery on the base end side so as to have appropriate elasticity.
[0022]
A proximal end portion of the bracket 151 is attached to the distal end portion of the arm member 140 by using a pin 153, and the bracket 151 is rotatable around an axis parallel to the axial direction of the drive rod 130. A claw portion 155 divided into three parts is formed on the distal end side of the bracket 151. These arm members 140 and the bracket 151 constitute an arm means 139.
[0023]
A lateral spring member 124 ′ is disposed between the pair of brackets 151 (the pair of arm means 139), and is engaged with the claw portion 155 of the bracket 151 in a state of extending from the natural state. That is, the pair of brackets 151 are connected by the lateral spring member 124 ′ that can contact the vertical frame member 121.
[0024]
The operation of the above configuration will be described. By rotating the drive rod 130 in one direction using the motor 132, the arm means 139 is rotated in one direction, and the lateral spring member 124 ′ connecting the bracket 151 of the arm means 139 is moved vertically to the flat mat 120. Abuts on the frame member 121 and pushes the vertical frame member 121 (see FIG. 4). The flat mat 120 moves toward the seated person's back against the urging force of the tension coil spring 125.
[0025]
Next, when the drive rod 130 is rotated in the other direction by using the motor 132, the arm means 139 rotates in the other direction, and the lateral spring member 124 ′ of the arm means 139 becomes the vertical frame of the flat mat 120. Separate from the material 121. The flat mat 120 returns to the original position by the elastic restoring force of the tension coil spring 125.
[0026]
According to the above configuration, the following effects can be obtained.
(1) The engagement between the pair of arm means 139 and the vertical frame member 121 of the flat mat 120 is the contact by the lateral spring member 124 ′ provided so as to connect the bracket 151 of the pair of arm means 139. As a result, there is no need to mount the flat mat 120 in the width direction in a state where the flat mat 120 is expanded or contracted against the elastic repulsion force of the plurality of lateral spring members 124, and the mounting is facilitated.
(2) A spring non-installation region X in which the lateral spring member 124 is not provided is provided in the vicinity of the portion of the flat mat 120 where the arm means 139 engages, and the bracket 151 of the pair of arm means 139 is provided to be connected. The lateral spring member 124 ′ is provided in a state extended from the natural state, so that the tension in the central portion in the width direction of the flat mat 120 is ensured, and the feeling of foreign matter due to the vertical frame member 121 of the flat mat 120 is comfortable. Will not go wrong.
(3) The bracket 151 of the pair of arm means 139 is attached to the tip of the arm member 140 so as to be rotatable about an axis parallel to the axial direction of the drive rod 130.
[0027]
Compared to the case where these brackets 151 are respectively fixed to the arm members 140, the lateral spring members 124 ′ attached so as to rotate the drive rod 130 and connect the brackets 151 are the vertical frame members of the flat mat 120. The range of contact with 121 is smaller in the present embodiment in which the bracket 151 is rotatably attached to the distal end portion of the arm member 140. Therefore, the seating feeling is improved.
(4) By connecting the connecting member provided so that the two brackets 151 rotate in synchronization with the lateral spring member 124 ′, the number of parts can be reduced.
【The invention's effect】
As described above, according to the present invention, the second lateral direction in which the engagement between the pair of arm means and the vertical frame member of the flat mat is provided to connect the brackets of the pair of arm means. The contact by the spring member eliminates the need to install the flat mat in the width direction in a state where the flat mat is expanded or contracted against the elastic repulsion force of the plurality of first lateral spring members. It becomes.
[0029]
Further, a non-spring installation area where the first lateral spring member is not provided is provided in the vicinity of the portion of the flat mat where the arm means engages, and the flat mat is provided so as to connect the brackets of the pair of arm means. The second lateral spring member thus provided is provided in a state extended from the natural state, so that the tension in the center portion in the width direction of the flat mat is secured, and the feeling of foreign matter due to the vertical frame material of the flat mat is poor, and the comfort is poor. It will never be.
[0030]
Furthermore, the brackets of the pair of arm means are attached to the distal ends of the arm members so as to be rotatable about an axis parallel to the axial direction of the drive rod. Compared with the case where these brackets are respectively fixed to the arm members, the range in which the lateral spring member attached so as to rotate the drive rod and connect the brackets to the vertical frame member of the flat mat is the bracket. However, the present invention in which the arm member is rotatably attached to the distal end portion of the arm member becomes smaller. Therefore, the seating feeling is improved.
[0031]
Further, since the connecting member provided so that the two brackets rotate synchronously is also used as the lateral spring member, the number of parts can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an overall configuration of a lumbar support device according to an embodiment of the present invention.
FIG. 2 is a view in the direction of arrow B in FIG.
FIG. 3 is a left side view of FIG. 2;
4 is a cross-sectional view taken along line AA in FIG. 2. FIG.
FIG. 5 is a diagram illustrating an overall configuration of a conventional lumbar support device.
6 is an exploded perspective view of the arm means of FIG. 5. FIG.
7 is a diagram for explaining the operation of the lumbar support device shown in FIG. 5. FIG.
[Explanation of symbols]
120 Flat mat 121 Vertical frame member 124, 124 'Horizontal spring member 130 Drive rod 139 Arm means 140 Arm member 151 Bracket

Claims (3)

A seat back frame (110) having left and right longitudinal members (111);
The seat back frame (110) has a pair of vertical frame members (121) positioned inside the left and right vertical members (111), and a plurality of first frame members (121) are disposed between the pair of vertical frame members (121). A flat mat (120) connected to the lateral spring member (124) and elastically supported in the seat back frame (110) via the spring member (125);
A drive rod (130) rotatably supported between left and right longitudinal members (111) of the seat back frame (110);
A pair of arm means (139) having one end fixed to the drive rod (130) and the other end being engageable with the vertical frame member (121) of the flat mat (120);
In the lumbar support device having
A first lateral spring member non-installation region (X) where the first lateral spring member (124) is not provided is provided in a portion of the flat mat (120) where the arm means (139) engages. ,
An arm member (140) having a base end fixed to the drive rod (130) in a non-rotatable manner;
A bracket (151) attached to the tip of the arm member (140) so as to be rotatable about an axis parallel to the axial direction of the drive rod (130);
Furthermore, the two brackets (151) are connected by a second transverse spring member in the state extending from the natural state (124 '),
The lumbar support device according to claim 1, wherein the second lateral spring member (124 ') can be brought into contact with the vertical frame member (121) by the rotation of the drive rod (130) .   The lumbar support device according to claim 1, wherein the second lateral spring member (124 ') is capable of contacting the pair of vertical frame members (121) at a plurality of locations.   The lumbar support device according to claim 1 or 2, wherein the second lateral spring member (124 ') is provided so that the two brackets (151) rotate synchronously.

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