JPH0658758U - Manual lumbar support mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the operability of the seat equipped with the lumbar support mechanism and the reclining mechanism, and to improve the usability when the backrest is tilted backward. [Structure] A lumbar support mechanism 3 is built in a backrest 1 having a reclining mechanism. When the backrest 1 is fully rearwardly displaced by the reclining mechanism, the release projection 19 for releasing the push plate 8 of the lumbar support mechanism 3 backwards interferes with the release block 20 fixed to the arm frame of the armrest 5. An automatic release mechanism 21 that drives release is configured. When displaced to the sleeping posture, the lumbar support mechanism 3 pushing out the lumbar portion is retracted from the abutment surface of the seat, and the protrusion of the lumbar portion is automatically eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a lumbar support mechanism in a seat of an aircraft or a vehicle, and more particularly to a manual lumbar support mechanism for a seat having a reclining mechanism.

[0002]

[Prior art]

 Conventionally, seats equipped with a reclining mechanism that adjusts the rearward tilting angle of the backrest and a lumbar support mechanism that adjusts the abutment surface of the lumbar part of the backrest have been used in seats of aircraft and vehicles. .

[0003]

[Problems to be solved by the device]

 However, when using the seat with the above mechanism, if the lumbar support mechanism is in the state of protruding the contact surface when the reclining angle of the backrest is fully tilted backward, Since the weight of the user who sleeps on his back is concentrated on his waist, he not only has a bad feeling of use, but also has the problem that his back and waist get tired and painful after resting.

The present invention has been made in view of the above problems, and when the lumber support mechanism is operated to the protruding side, when the reclining mechanism is operated to bring the backrest to the full tilt position, It is an object of the present invention to provide a manual lumbar support mechanism in which the lumbar support mechanism is automatically released and automatically operates so that the contact surface of the backrest is flat or retracts.

[0005]

[Means for Solving the Problems]

 INDUSTRIAL APPLICABILITY The manual lumbar support mechanism according to the present invention is used for a seat backrest equipped with a reclining mechanism for appropriately adjusting the support angle rearward, and the lumbar vertebra contact surface of the seatback is adjusted to move back and forth to adjust the support position. In the manual lumbar support mechanism to be changed, the lumbar support mechanism that pushes the lumbar part abutment surface from the back side by the manual pushing mechanism and also releases the backward movement, by the backward displacement of the backrest by the reclining mechanism, When the reclining mechanism is fully tilted backward, an automatic release mechanism is added to drive the release by interfering with a member provided on an arm frame that constitutes an armrest of a seat.

[0006]

[Action]

 The lumbar support mechanism is automatically operated when the reclining mechanism is operated from the protruding operation state and the backrest is fully tilted back and displaced to the sleeping position. The automatic release mechanism is configured to interfere with the member fixed to the arm frame at a predetermined position by the backward tilting of the backrest, so that the lumbar support mechanism that pushed out the lumbar part abuts due to this interference operation. It acts to retract from the plane, automatically eliminating the lumbar protrusion.

[0007]

【Example】

 An embodiment of a manual lumbar support mechanism according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a backrest of an aircraft seat, FIG. 2 is an exploded perspective view of the lumbar support mechanism, and FIG. 3 is a front view of an automatic release mechanism portion of the lumbar support mechanism.

The backrest 1 is a back frame 2 in which a lower end portion is axially installed (rotation center O1) on a bottom frame 4 through a reclining mechanism (not shown) so that the tilting angle can be freely adjusted. The lumbar portion has a lumber support mechanism 3 of the present invention, which will be described later, built in, and has a structure in which the skin sheet material is covered via a cushion pad. An arm frame is fixed to the side of the bottom frame 4 to form an armrest 5.

The lumbar support mechanism 3 includes a pair of hinge brackets 7, 7 protruding from a back plate 6 fixed between the back frames 2 and 2, and a push plate 8 having a horizontally long rectangular front shape, Hinge protrusions 9 and 9 projecting from the rear side upper end of the push plate 8 are pivotally mounted via bolts and nuts 10 and 10, and a swing side end of the push plate 8 is provided by a manual pushing mechanism 11. The structure is such that the retracting position of the back surface is regulated and the withdrawal of the lumbar spine of the contact surface is adjusted.

The manual push-out mechanism 11 has bearing brackets 13 and 13 projecting from a horizontal frame 12 installed between both side frames of the lumbar region of the back frame 2, and bush bearings 14 and 14 provided on the bearing brackets 13 and 13, respectively. The rotating shaft 15 is rotatably mounted via the shaft so as to be parallel to the horizontal frame 12, and a pair of pressing rollers 16 and 16 are rotatable on one side of the rotating shaft 15. It has a structure in which it is abutted against the rear surface of the push plate 8 so as to project, and the retracted position of the push plate 8 can be regulated by the rotational displacement of the rotary shaft 15.

Reference numeral 17 denotes a lumbar support adjusting lever that is attached to the shaft end of the rotating shaft 15 and swivels within the range (arrows S) of the stoppers 18, 18 projecting from the bearing bracket 13 to move the pressing roller. The 16 and 16 positions are stably held in the protruding position and the retracted position. The lumbar support adjusting lever 17 is provided at its base with a release projection 19 protruding in the radial direction with respect to the axis of the rotary shaft 15, and interferes with a release block 20 fixed to the arm frame of the armrest 5. The automatic release mechanism 21 is configured.

In the release block 20 of the automatic release mechanism 21, the cam surface 22 is centered around the rotation center O1 of the reclining mechanism at a position (arrow B) where the reclining mechanism is fully tilted back by operating the reclining mechanism. It is fixed to the arm frame by a screw 23 so as to traverse the concentric circle, and at that position, it interferes with the release projection 19 to rotate the rotating shaft 15 in the direction in which the pressing roller 16 retracts. Has become.

Next, the operation of the seat constituting the above manual lumbar support mechanism will be described. When the backrest 1 is operated in the reclining mechanism to be used in the normal backward tilting position (the range indicated by the arrow A), the lumbar support mechanism 3 is set in the pushing position or the retracted position as shown in FIGS. 3 and 4. It can be set to either state. When the lumbar support adjusting lever 17 is swung in the direction of the arrow F, the pressing rollers 16 and 16 press the rear surface of the end portion of the pushing plate 8 on the swing side via the turning shaft 15, so that the pushing plate 8 is rotated. It swings about the toe nut 10 and operates so as to push the lumbar skin material of the backrest forward.

Further, when the lumbar support adjusting lever 17 is swung in the direction of arrow R, the pressing rollers 16, 16 that pushed out the pressing plate 8 via the rotating shaft 15 retreat, and the pressing plate 8 is bolted. The nut 10 swings and retreats, and the protrusion of the lumbar spine of the backrest 1 is eliminated.

Here, from the state in which the lumbar support mechanism 3 is operating to project the lumbar portion of the backrest 1, the reclining mechanism is operated and the backrest 1 is fully tilted backward (at the position of arrow B) to put it in a sleeping position. When displaced, as shown in FIG. 5, the release protrusion 19 protruding from the base of the lumbar support adjusting lever 17 at that position interferes with the cam surface 22 of the release block 20. The release projection 19 pressed against the cam surface 22 by this interference operation displaces the rotary shaft 15 while sliding the cam surface 22 so that the lumbar support adjusting lever 17 rotates in the direction of the arrow R, and thus the lumbar support. Similarly to when the adjusting lever 17 is oscillated in the direction of arrow R, the pressing rollers 16 and 16 that pushed out the pressing plate 8 via the rotating shaft 15 retreat, and the pressing plate 8 pushes the bolts and nuts 10 together. It swings and retreats around the center, and the protrusion of the lumbar vertebrae of the backrest 1 is automatically eliminated.

Therefore, when the backrest 1 is in the sleeping position, the lumbar vertebra is always kept flat, and the lumbar support mechanism 3 does not feel a foreign object.

In the above-described embodiment, the structure in which the release block 20 of the automatic release mechanism 21 is integrated with the lumbar support adjusting lever 17 has been described. However, the automatic release mechanism 21 of the lumbar support mechanism 3 of the present invention is The present invention is operated by the relative displacement of the back frame 2 with respect to the arm frame constituting the armrest 5 by the operation of the reclining mechanism. The present invention uses the relative displacement by the reclining mechanism to release the lumbar support mechanism 3. It goes without saying that various other design changes that can be achieved are possible.

[0018]

[Effect of device]

 Since the manual lumbar support mechanism according to the present invention is configured as described above, when the seat reclining mechanism is operated and the backrest is fully tilted backward, the protrusion of the lumbar support mechanism contained in the backrest is projected. It works to automatically eliminate the condition, the lumbar part is held flat when sleeping, and the lumbar support mechanism eliminates the feeling of foreign matter, improving the usability. It has features such as good operability, and the effect obtained by implementing the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main portion of a reclining seat for an aircraft having a manual lumbar support mechanism according to the present invention.

FIG. 2 is an exploded perspective view of the lumbar support mechanism portion.

FIG. 3 is a front view of relevant parts showing an automatic release mechanism of a lumbar support mechanism.

FIG. 4 is an explanatory diagram showing an operation of the lumbar support mechanism when the backrest is erected.

FIG. 5 is an explanatory diagram showing an automatic release operation of the lumbar support mechanism when the backrest is tilted backward.

[Explanation of symbols]

 1 Back Slip 2 Back Frame 3 Lumber Support Mechanism 5 Armrest 6 Back Plate 8 Push Plate 10 Bolts / Nuts 11 Manual Pushing Mechanism 12 Horizontal Frame 15 Rotating Shaft 16 Pressing Roller 17 Lumbar Support Adjusting Lever 19 Release Protrusion 20 Release Block 21 Automatic Release mechanism 22 Cam surface

Claims (1)

[Scope of utility model registration request] 1. A manual lumber for use in a seat backrest provided with a reclining mechanism for appropriately adjusting a rearward inclination angle, for adjusting the lumbar contact surface of the seat back and forth to change the support position. In the support mechanism, the lumbar support mechanism for pressing the lumbar part contact surface from the back side by the manual push-out mechanism and releasing the backward movement,
When the reclining mechanism is fully tilted backward due to the backward displacement of the backrest by the reclining mechanism, an automatic release mechanism is added to drive the release by interfering with a member provided on the arm frame that constitutes the armrest of the seat. Characteristic manual type lumbar support mechanism.