JP2013173419A - Seat back frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationalize a constitution of a seat back frame.SOLUTION: A seat back frame 1 forms a skeleton of a seat back, and includes respective side frames 2 and 2 for forming a skeleton of both right and left side parts of the seat back, an upper frame (an upper side frame part 3A) rigidly joined by being extended between upper parts of the respective side frames 2 and 2 and forming a skeleton of an upper side part of the seat back, and an intermediate frame (a lower side frame part 3B) set in a frame inside space 1A enclosed by the upper frame (the upper side frame part 3A) and the respective side frames 2 and 2. The intermediate frame (the lower side frame part 3B) is formed by extending a shape of the upper frame (the upper side frame part 3A) to the lower side.

Description

  The present invention relates to a seat back frame. Specifically, the present invention relates to a seat back frame that forms a skeleton of the seat back.

  Conventionally, as a seat back frame structure of a vehicle seat, a pair of left and right side frames, an upper frame that is bridged between the upper ends of these side frames and rigidly connected, and upper portions of both side frames separately from the upper frame A configuration comprising a reinforcing member that is bridged between regions and is rigidly coupled is known (Patent Document 1). The upper frame and the reinforcing member are individually assembled and integrally coupled to the side frames.

JP-A-11-216037

  However, in the prior art, the upper frame and the reinforcing member are configured separately, so that the number of parts is large, and these work steps are also increased because they must be individually assembled to each side frame. There is a problem. The present invention has been created as a solution to the above-described problem, and a problem to be solved by the present invention is to rationalize the configuration of the seat back frame.

In order to solve the above problems, the seat back frame of the present invention takes the following means.
The first invention is a seat back frame that forms a skeleton of the seat back, and each side frame that forms the skeleton of the left and right sides of the seat back, and is bridged between the upper portions of the side frames and is rigidly coupled. An upper frame that forms a skeleton of the upper portion of the seat back, and an intermediate frame set in a space within the frame surrounded by the upper frame and each side frame. The intermediate frame was formed by extending the shape of the upper frame downward.

  According to the first aspect of the present invention, the intermediate frame can be set without increasing the number of parts by forming the intermediate frame by extending the shape of the upper frame downward. Specifically, the intermediate frame is configured as a single component with the upper frame, and is provided in a state of being integrally coupled to each side frame, like the upper frame. In this way, the configuration of the seat back frame can be rationalized by configuring the intermediate frame with the upper frame and one component.

  According to a second invention, in the first invention described above, the intermediate frame is provided in a state where it is bridged between the side frames and is rigidly coupled.

  According to the second aspect of the invention, the intermediate frame is provided between the side frames so as to be bridged between the side frames and rigidly connected to each other, so that the intermediate frame serves as a reinforcing member and increases the structural strength of the seat back frame. be able to.

  According to a third invention, in the first or second invention described above, the upper frame is formed in a rectangular loop shape in which the frames are arranged vertically and horizontally, and the left and right frame portions of the loop shape of the upper frame are provided on each side frame. It is rigidly connected and the lower frame part is configured as an intermediate frame.

  According to the third aspect of the invention, the upper frame is formed in a rectangular loop shape, the left and right side frame portions are rigidly connected to the side frames, and the lower frame portion is an intermediate frame. The loop-shaped upper frame can set a reinforcing structure having high structural strength in the seat back frame.

1 is a perspective view illustrating a configuration of a seat back frame of Example 1. FIG. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the perspective view which showed the structure of the seat back frame of another Example. It is the perspective view which showed the structure of the seat back frame of another Example.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the seat back frame 1 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the seat back frame 1 of this embodiment forms a skeleton of a seat back of a vehicle seat. The seat back frame 1 includes a pair of left and right longitudinal side frames 2 and 2 that form a skeleton on both the left and right sides of the seat back, and a seat that is bridged between the upper portions of the side frames 2 and 2 and is rigidly coupled. And an upper pipe 3 that forms the skeleton of the upper portion of the back.

  Each of the pair of side frames 2 and 2 is formed by cutting a single steel plate into a vertically long shape, and is disposed in a state in which the plate surfaces face each other in the sheet width direction. Yes. The upper pipe 3 is formed by bending a straight steel pipe having a circular cross section into a rectangular loop shape and joining the ends endlessly. Specifically, the end portions of the upper pipe 3 are connected to each other at the center of the lower frame portion of the rectangle. Specifically, as shown in FIG. 2, both ends of the upper pipe 3 have a shape in which one end is squeezed by swaging, and this is fitted into the other end to be welded. , It is in a state of being firmly connected with a good appearance so as to have a flat surface shape with few steps of each joint.

  As shown in FIGS. 1 and 3, the upper pipe 3 has its rectangular left and right side frame portions 3C and 3C applied to the upper portions of the side frames 2 and 2, respectively. It is in a state of being integrally coupled. Here, the upper part of each side frame 2 and 2 is formed in the shape curved in the circular arc shape so that the outer peripheral surface shape of each frame part 3C and 3C of each side may be followed, respectively, It welds in the state applied to the outer peripheral surface of the parts 3C and 3C widely on the surface. Accordingly, the upper pipe 3 and the side frames 2 and 2 are firmly and integrally joined to each other.

  As shown in FIG. 1, the seat back frame 1 is inverted U-shaped by the above-described side frames 2 and 2 and the upper pipe 3 spanned between the upper portions of the side frames 2 and 2. It is formed in a frame shape. Further, the seat back frame 1 further includes a lower panel 4 made of a horizontally long steel plate between the lower portions of the side frames 2 and 2 described above, and is integrally rigidly connected by welding. Has been. A lower end of a support spring that supports the lower end of a U-shaped support wire (contour mat) (not shown) that is assembled in the frame of the seat back frame 1 and supports the back surface of the seated occupant is hooked to the lower panel 4. It has become so.

  By the way, the upper pipe 3 formed in the shape of a rectangular loop spanned between the upper portions of the side frames 2 and 2 functions so that the upper frame portion 3A forms the skeleton of the upper portion of the seat back. It has become a thing. Further, the lower frame portion 3B of the upper pipe 3 is positioned below the upper frame portion 3A, and is within the space 1A in the frame surrounded by the upper frame portion 3A and the side frames 2 and 2. Is located. Here, the upper frame portion 3A corresponds to the “upper frame” of the present invention, and the lower frame portion 3B corresponds to the “intermediate frame” of the present invention. Since the lower frame portion 3B is connected to the left and right side frame portions 3C and 3C rigidly coupled to the side frames 2 and 2, the side frames 2 and 2 are connected to each other. It functions as a reinforcing member that increases the structural strength of the seat back frame 1 by connecting them.

  Further, since the lower frame portion 3B described above is located in the space 1A in the frame of the seat back frame 1, for example, the lower frame portion 3B is disposed within the frame of the seat back frame 1 described above. You may make it function as a hooking part which hooks the upper end of the U-shaped support wire (contour mat) which is assembled | attached to (not shown). Thereby, the structure which can support the upper end of the said support wire with the stable support intensity | strength in the low position nearer to a waist | hip | lumbar part can be taken. In addition, the lower frame portion 3B is used to fix or engage various equipment mounted on the seat back at a position in the space 1A in the frame of the seat back frame 1. It is something that can be done.

  Here, the upper pipe 3 described above has two corners for holding the support members 22 and 22 for inserting and mounting the stays 21 and 21 of the headrest 20 mounted on the upper portion of the seat back from above. Cylindrical support holders 5 and 5 are welded and fixed side by side in the sheet width direction. These support holders 5 and 5 are bridged in the height direction across the upper frame portion 3A and the lower frame portion 3B of the upper pipe 3, respectively. The upper frame portion 3A and the lower frame portion It is welded and fixed to 3B. In detail, each support holder 5, 5 is applied to the front side of the upper frame portion 3 </ b> A, and is applied to the rear side of the lower frame portion 3 </ b> B so as to be applied to the rear surface side thereof. 3 is provided in a state of being passed through the loop.

  As shown in FIGS. 2 and 4, the front and rear surfaces of the upper frame portion 3A and the lower frame portion 3B to which the support holders 5 and 5 are applied are partially flat as shown in FIGS. The shape has been crushed by. Then, the flat rear surfaces or front surfaces of the support holders 5 and 5 are applied to the flatly crushed surface portions, so that they are welded in a state where they are in wide contact with each other. By this surface contact, each force applied from the support holders 5 and 5 to the upper frame portion 3A and the lower frame portion 3B with the use of the headrest 20 is widely dispersed and received.

  Referring to FIG. 1, the support holders 5, 5 are each applied to and welded to the front surface of the upper frame portion 3 </ b> A of the upper pipe 3 and the rear surface of the lower frame portion 3 </ b> B as described above. As a result, the load associated with the use of the headrest 20 applied to the support holders 5 and 5 can be firmly received by the upper pipe 3 (seat back frame 1). Specifically, when a load is applied to the headrest 20 so that the head of the seated occupant leans, the support holders 5 and 5 that support the headrest 20 are supported at the connection point with the upper frame portion 3A of the upper pipe 3. A force in the rotational direction that tilts the headrest 20 backward is applied. However, even when such a force is applied, the lower portions of the support holders 5 and 5 are supported by being in surface contact with the lower frame portion 3B from the rear side. The upper pipe 3 (seat back frame 1) is firmly supported without rotating around the connection point with the upper frame portion 3A.

  By the way, the seat back frame 1 described above has seats interposed between reclining devices 10 and 10 whose lower end portions on both the left and right sides (side frames 2 and 2) function as rotation shaft devices that can stop rotation. It is connected and supported by the rear part of each side frame 11 and 11 which comprises the frame | skeleton of the right-and-left both sides of a cushion. The reclining devices 10 and 10 are configured to lock and release the backrest angle (rotation angle) of the seat back when the operation shafts 10B and 10B inserted through the center portions thereof are axially rotated. It has become. Each reclining device 10, 10 is normally held in a state in which the backrest angle (rotation angle) of the seat back is locked, and the release is connected to the operation shaft 10B of the reclining device 10 outside the vehicle (left side in the figure). The lever 10A can be switched to the released state by an operation of pulling up the lever 10A. The operation shafts 10B and 10B are connected to each other so as to rotate integrally with a connecting rod 10C, and the rotation operations for locking and releasing are performed simultaneously in synchronism with the left and right. . In addition, since the basic structure of each reclining apparatus 10 and 10 is the same as what was disclosed by literature, such as Unexamined-Japanese-Patent No. 2011-116303, the specific description shall be abbreviate | omitted.

  Thus, according to the configuration of the seat back frame 1 of the present embodiment, by forming the upper pipe 3 by bending it into a rectangular loop shape, on the lower side of the upper frame portion 3A that functions as an upper frame, The lower frame portion 3B that can function as a reinforcing member or an engaging member for various equipment is formed in an integrally extended form. Therefore, by forming the upper pipe 3, the lower frame portion 3 </ b> B that functions as the above-described reinforcing member or engaging member of various equipment can be provided in the space within the seat back frame 1 without increasing the number of parts. 1A can be set. Thus, the upper frame portion 3A that functions as an upper frame, and the lower frame portion 3B that functions as an engaging member for a reinforcing member or various equipment in the space 1A in the frame of the seat back frame 1, By configuring with one part, the configuration of the seat back frame 1 can be rationalized.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, the upper frame of the present invention does not need to be formed in a rectangular loop shape, and as shown in FIG. The frame portion and the lower frame portion are respectively constructed so as to be bridged between the side frames and rigidly coupled, or as shown in FIG. 6, the lower frame portion is between the side frames. It may be formed in a “U” shape (end shape) extending to a midpoint. In addition, various shapes that are formed by extending the shape of the upper frame such as a “Z” shape downward can be adopted. It is preferable that it can be formed by bending the steel pipe material because it is easy to form. In addition to the circular shape shown in the above embodiment, the upper frame may have another closed cross-sectional shape such as an elliptical shape or a rectangular shape. It may be an open cross section.

DESCRIPTION OF SYMBOLS 1 Seat back frame 1A Space in frame 2 Side frame 3 Upper pipe 3A Upper frame part (upper frame)
3B Lower frame (intermediate frame)
3C Horizontal frame portion 4 Lower panel 5 Support holder 10 Reclining device 10A Release lever 10B Operation shaft 10C Connecting rod 11 Side frame 20 Headrest 21 Stay 22 Support member

Claims (3)

A seat back frame forming a skeleton of the seat back,
Each side frame forming the skeleton of the left and right sides of the seat back;
An upper frame that forms a skeleton of the upper portion of the seat back, which is bridged between the upper portions of the side frames and is rigidly coupled;
An intermediate frame set in a space in a frame surrounded by the upper frame and each side frame;
A seat back frame, wherein the intermediate frame is formed by extending the shape of the upper frame downward. The seat back frame according to claim 1,
A seat back frame, wherein the intermediate frame is provided in a state of being bridged between the side frames and rigidly coupled. The seat back frame according to claim 1 or 2,
The upper frame is formed in a rectangular loop shape in which the frames are arranged vertically and horizontally, the left and right frame portions of the loop shape of the upper frame are rigidly coupled to the side frames, and the lower frame portion as the intermediate frame A seat back frame characterized by being configured.

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