JP5487175B2 - Shock-absorbing automotive seat - Google Patents

Description

  The present invention relates to an automobile seat configured to be capable of absorbing impact energy by a seat back when receiving an impact due to a collision or the like.

  2. Description of the Related Art In general, an automobile seat is composed of a seat cushion installed on a vehicle body floor, and a seat back that is stood and held on the rear side of the seat cushion so that the angle of the seat cushion can be adjusted by a reclining device or forwardly and backwardly. .

  The seat back uses a pipe member that is bent in a substantially downward U-shape as a main frame, and an upper frame portion that is press-formed from a steel plate material into a predetermined shape is welded and fixed to the upper shaft portion of the main frame, and a predetermined amount from the steel plate material. Because the left and right side frame parts press-molded into the shape are welded and fixed to the left and right vertical axis parts of the main frame, and the straight pipe member is welded and fixed as the lower frame part between the lower ends of the left and right vertical axis parts The seat back frame having a substantially quadrangular frame shape is assembled on the base frame.

  In the seat back, in order to be able to absorb impact energy due to collision etc. with the seat back frame, the lower frame part by the pipe member is divided into two parts, and each lower pipe is cantilevered by the outer shaft end on each side. A structure that constitutes a lower frame portion of a seat back frame is known because it is welded and fixed to a frame portion, and an inner pipe straddling between the two is slidably inserted into the diameter of each lower pipe (Patent Document 1). .

  According to the seat back frame, when a load of a seated person accompanying an impact is applied to the seat back, the lower pipe bends to the left and right sides and the rear side, the lower pipe is separated to the left and right sides, and the inner pipe slides within the diameter of the lower pipe. Since the lower frame portion moves and bends and deforms as a whole, a large deformation stroke toward the rear side of the lower frame portion can be secured, and the impact applied to the occupant can be absorbed.

JP 10-103880 A

  In the present invention, when a seat occupant load accompanying an impact is applied to the seat back, the seat back frame is bent backward and deformed with a simple structure. The issue is to provide.

The invention according to claim 1 of the present application is a seat back frame having a frame shape from left and right side frame portions, an upper frame portion extending between upper portions of the side frame portions, and a lower frame portion extending between lower portions of the side frame portions. In an automobile seat comprising:
The lower frame part is provided by bending the left and right side bracket parts to be fixed to the lower edge of each side frame part forward from the lower frame part ,
The lower frame part is provided with a constricted part,
The constricted portion is provided so as to curve the plate surface of the lower frame portion in a semicircular arc shape of a front bulge, and is provided at the rear side edge of the left and right side bracket portions ,
When a load is applied at the time of collision , the constricted portion is provided so as to be able to bend and deform in a direction to narrow the semicircular arc-shaped mouth .

The invention according to claim 2 of the present application is characterized in that the lower frame portion is provided with the constricted portion in a longitudinal direction toward the left and right side bracket portions.

The invention according to claim 3 of the present application is characterized in that the constricted portion is provided to wrap around the rear side edges of the left and right side bracket portions.

The invention according to claim 4 of the present application is characterized in that the lower frame portion is provided with a linear shape in a longitudinal direction toward the left and right side bracket portions in the lower frame portion.

The invention according to claim 5 of the present application is characterized in that the lower frame part is formed of a metal plate, and the side bracket part is formed by being bent integrally with the lower frame part.

The invention according to claim 6 of the present application has a frame structure in which a reclining lock is assembled between a side bracket portion of the seat back frame and a side bracket portion of the seat cushion frame, and each side bracket portion includes the reclining It is held by a lock.

The invention according to claim 7 of the present application is characterized in that the reclining lock is integrally connected by a pivot shaft inserted through each side bracket, and the constricted portion is provided above the pivot shaft.

The invention according to claim 8 of the present application is characterized in that the constricted portion is provided above the reclining lock.

  According to the present invention, when a seated person's load is applied in response to an impact caused by a collision or the like, the constricted portion is deformed so that the upper side of the seat back frame is tilted backward from the constricted portion of the lower frame portion. The impact energy can be absorbed by a simple structure called a constricted portion, and the impact applied to the seated person can be mitigated by the rearward deviation of the seat back.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the accompanying drawings, the drawings show an automobile seat comprising a seat back and a seat cushion in a frame structure. This frame structure is a main component, and zigzag springs and other details for supporting the back pad and cushion pad are not shown.

  As shown in FIG. 1, the frame structure is composed of a seat back frame 1 serving as a base frame of a seat back and a seat cushion frame 2 serving as a base frame of a seat cushion. Each of the frames 1 and 2 is integrally assembled as a metal piece by joining the constituent parts obtained by press-molding a metal plate material such as an ultra-high-strength steel plate into a predetermined three-dimensional shape by spot welding.

  As shown from the back side in FIG. 2, the seat back frame 1 includes left and right side frame portions 10a and 10b, an upper frame portion 11 extending between upper portions of the side frame portions 10a and 10b, and lower portions of the side frame portions 10a and 10b. It is assembled so as to exhibit a substantially quadrangular frame shape from the lower frame portion 12 extending therebetween. In the figure, reference numerals 11a and 11b denote head holders (not shown) of stickers.

  The lower frame portion 12 is formed as a main portion that spans the lower back portions of the side frame portions 10a and 10b. The lower frame portion 12 is formed by bending the left and right side bracket portions 12a and 12b fixed to the lower edges of the side frame portions 10a and 10b forward, so that the entire structure including the side bracket portions 12a and 12b is integrated. Is formed.

  In the lower frame portion 12, a constricted portion 13 is provided in a straight line shape in the longitudinal direction toward the left and right side bracket portions 12 a and 12 b for absorbing shock caused by bending deformation of the seat back frame 1. As shown in FIG. 3, the constricted portion 13 wraps around the rear side of each side bracket portion 12 a, 12 b by projecting the plate surface of the lower frame portion 12 into a semicircular arc shape of a front bulge by a predetermined width. (See FIG. 1).

  The seat cushion frame 2 is assembled from left and right side frame portions 20a and 20b and a front frame portion 21 formed of a pan frame that is fixedly attached to the front upper portions of the side frame portions 20a and 20b. Side bracket portions 22a and 22b facing the side bracket portions 12a and 12b of the seat back frame 1 are continuously formed on the side frame portions 20a and 20b so as to stand upward from the rear side.

  The frame structure is such that the reclining locks 3a and 3b (see FIG. 2) are assembled between the side bracket portions 12a and 12b of the seat back frame 1 and the side bracket portions 22a and 22b of the seat cushion frame 2 and the reclining lock 3a. , 3b are integrally connected by a pivot shaft 4 inserted through each side bracket portion 12a, 12b, 22a, 22b, and an operation lever 5 for unlocking is provided at one end of the pivot shaft 4, so that the seat back is angled. It is designed for reclining seats that can be adjusted and / or moved forward and backward.

  At the same time, since the upper rail 6a attached and fixed to the side frame portions 22a and 22b of the seat cushion 2 is slidably combined with the lower rail 6b installed on the vehicle body floor, the slide rail 6 is slidably combined. It is configured.

  By using the frame structure, the back pad is assembled to the seat back frame 1, the cushion pad is assembled to the seat cushion frame 2, the back pad including each frame, and the cushion pad is encapsulated with the trim cover, It is assembled as a car seat consisting of a seat cushion.

  In the vehicle seat configured as described above, when a seated person's load is applied to the seat back in response to an impact caused by a collision or the like, the semicircular constricted portion 13 bends in the direction of narrowing the mouth as shown in FIG. As shown in FIG. 5, the seat back frame 1 is deformed so that the upper side of the seat back frame 1 falls backward from the constricted portion 13 of the lower frame portion 12.

  At that time, the left and right side bracket portions 12a, 12b are formed by being bent integrally with the lower frame portion 12, and the constricted portion 13 is provided to wrap around to the rear side of each side bracket portion 12a, 12b. Since the left and right side bracket portions 12 a and 12 b are held by the reclining locks 3 a and 3 b, the upper side of the seat back frame 1 is biased more stably after the constricted portion 13 of the lower frame portion 12. Thereby, the impact energy can be absorbed by the simple structure of the semicircular arc-shaped constricted portion 13, and the impact applied to the seated person can be reliably mitigated by the rearward deviation of the seat back.

It is a side view which shows the vehicle seat which concerns on embodiment of this invention with a frame structure. It is a rear view which shows the frame structure of FIG. It is sectional drawing which shows the frame structure of FIG. 1 by the AA line of FIG. It is explanatory drawing which shows an impact absorption effect | action based on the frame structure of FIG. It is explanatory drawing which shows an impact absorption effect | action based on the frame structure of FIG.

DESCRIPTION OF SYMBOLS 1 Seat back frame 2 Seat cushion frame 3a, 3b Reclining lock 4 Pivot shaft 10a, 10b Side frame part 11 Upper frame part 12 Lower frame part 12a, 12b Side bracket part 13 Constriction part

Claims (8)

In an automobile seat comprising a seat back frame that exhibits a frame shape from left and right side frame parts, an upper frame part that extends between upper parts of the side frame parts, and a lower frame part that extends between lower parts of the side frame parts,
The lower frame part is provided by bending the left and right side bracket parts to be fixed to the lower edge of each side frame part forward from the lower frame part,
The lower frame part is provided with a constricted part,
The constricted portion is provided so as to curve the plate surface of the lower frame portion in a semicircular arc shape of a front bulge, and is provided at the rear side edge of the left and right side bracket portions,
An impact-absorbing automotive seat characterized in that, when a load is applied during a collision, the constricted portion is provided so as to be able to bend and deform in a direction of narrowing a semicircular arc-shaped mouth. The automobile seat according to claim 1, wherein the lower frame portion is provided with the constricted portion in a longitudinal direction toward the left and right side bracket portions. 2. The automobile seat according to claim 1, wherein the constricted portion is provided to wrap around a rear side edge of the left and right side bracket portions. The automobile seat according to claim 1, wherein the lower frame portion is provided with the constricted portion in a straight line in a longitudinal direction toward the left and right side bracket portions. The lower frame part is formed of a metal plate material,
The automobile seat according to claim 1, wherein the side bracket portion is formed by being integrally bent from the lower frame portion. It has a frame structure in which a reclining lock is assembled between a side bracket portion of the seat back frame and a side bracket portion of the seat cushion frame, and each side bracket portion is held by the reclining lock. The automobile seat according to claim 1 . The automobile seat according to claim 6 , wherein the reclining lock is integrally connected by a pivot shaft inserted through each side bracket, and the constricted portion is provided above the pivot shaft. The automobile seat according to claim 6 or 7 , wherein the constricted portion is provided above the reclining lock.