JPH0512104Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to passenger seats in vehicles, ships, aircraft, etc., and in particular, when an impact load is received from the rear of the seat bag, the seat bag is moved forward. This invention relates to a seat back tilting device for tilting the seat back forward.

[Conventional technology]

Conventionally, passenger seats in vehicles, ships, aircraft, etc. have been designed to prevent passengers sitting in the rear seats from accidentally colliding their heads or bodies with the seat backs of the front seats and causing injury in the event of an accident or other emergency. In this way, a seat back tilting device is incorporated which, when an impact load of a predetermined value or more is applied to the seat back, tilts the seat back itself forward to absorb the kinetic energy of the impact load.

Such a seat back forward tilting device has a connecting edge 3b on the rear end side and a seat back folding device inside a breakover arm 3 having a substantially U-shaped cross section, as shown in FIGS. 6 and 7. Insert the lower end 2a of the back frame 2 into the breakover arm 3.
It is rotatably fixed to the seat base frame (not shown) approximately in the center of the breakover arm 3 by a rotation shaft 9 common to both, and the rotation shaft is attached to a fan-shaped portion formed on the upper side of the breakover arm 3. A forward tilting groove 10 is formed in an arc shape with rotation center 9, and a bearing 11 that slides into contact with the end face of the breakover arm 3 is interposed in the forward tilting groove 10, and these sliding contact parts are connected with bolts. It is fixed with appropriate clamping pressure using a fastener 12 such as a nut,
A seat lock for reclining the seat bag is provided at the lower end of the breakover arm 3.

By adjusting the tightening pressure of this fastener 12, the impact load force of the seatback frame 2 against the breakover arm 3 can be adjusted, and when a load is applied to the seatback from the rear to the front. , within the stroke range in which the fastener 12 moves within the forward tilting groove 10, the bearing 11 rotates together with the seatback frame 2 to tilt the seatback frame 2 forward, and the bearing 1
1 is in sliding contact with the end surface of the breakover arm 3, and the friction force generated is used to reduce the load applied to the seat back from the rear during the tilting operation. Also, when reclining the seat back, the seat back frame 2 is connected to the connecting edge 3 of the breakover arm 3.
b side and tilts toward the rear of the seat together with the breakover arm 3.

[The problem that the idea attempts to solve]

However, the forward tilting angle of the seatback of this type of seatback forward tilting device, that is, the braking range is limited by the shape and length of the forward tilting groove 10, and the forward tilting groove 10, that is, the forward tilting dimension. In order to increase the forward tilting groove 10, it is necessary to increase the size of the fan-shaped part of the breakover arm 3, and when the fan-shaped part becomes large, it protrudes into the waist position of the passenger. In addition, if the impact load on the seat back from the rear is large, if the forward tilting angle of the seatback, that is, the braking range is narrow, the seatback will only tilt forward halfway, which may cause damage to the rear seat passengers. The problem was that people's heads and bodies could collide with this and get injured.

Furthermore, forming the fan-shaped portion of the breakover arm 3 to be large also has the problem that it becomes difficult to ensure the accuracy of the groove machining and flat machining of the forward tilting groove 10.

The present invention was devised in view of the above problem, and by providing an open part on the front end side of the forward tilting groove of the breakover arm of the forward tilting device, it is possible to prevent the seatback from receiving an impact of more than a predetermined load from the rear of the seat back. In this case, the seatback frame is released from the forward tilting groove of the breakover arm and rotates freely, increasing its movable range and making it possible to make the fan-shaped portion of the breakover arm relatively small. The object of the present invention is to provide a seat back tilting device that can be folded forward.

[Means to solve the problem]

In order to achieve the above object, the seatback forward tilting device according to the present invention has a connecting edge on the rear end side and a lower end of the seatback frame inside the breakover arm having a substantially U-shaped cross section. Insert and support rotatably in the front and rear directions,
An arc-shaped forward tilting groove that opens toward the front end side along the rotating direction of the seatback frame is formed on the upper end side end surface of the breakover arm, and the breakover arm is formed at least in the forward tilting groove forming portion. A pair of bearings are inserted to sandwich and slide the inner and outer end surfaces of the seatback frame, and fasteners such as bolts and nuts are passed through the forward tilting grooves and fixed to the end surfaces of the seat back frame. The gist is that the contact parts are tightened with appropriate clamping pressure, and a spacer can be inserted between the pair of bearings that slide in contact with the inner and outer end surfaces of the breakover arm to regulate the minimum distance between both bearings. .

Further, a member for stopping the seat back frame from falling forward may be provided protruding from the front end side of the breakover arm to restrict the range in which the seat back frame may fall forward.

[Effect]

According to the above configuration, the seatback frame is integrally clamped and fixed to the breakover arm, and when performing a reclining operation, it can be rotated rearward together with the breakover arm and tilted rearward.

On the other hand, when an impact load of more than a predetermined value is applied to the seat back from the rear to the front, the above-mentioned fastener moves within the forward tilting groove, and is further released at the open part of the forward tilting groove, causing the seat bottom surface to Lean up to.

At this time, since the pair of bearings rotating together with the seat back frame are in contact with the inner and outer end surfaces of the breakover arm with appropriate clamping pressure, the load is reduced by frictional force and the impact is softened.

Note that by providing a stopping member for the breakover arm projecting from the front end side of the breakover arm, the range of rotation of the seat back frame can be restricted within that range.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a seat back tilting device according to the present invention will be described with reference to the drawings.

In the drawing, 1 is a seat back of the seat, 2 is a seat back frame for supporting and fixing the left and right sides of the seat back 1 to the rear of the seat, and its lower end is connected to a common shaft, which will be described later, together with the breakover arm 3. The rear end of the base frame 4 is pivoted at an appropriate position and is configured to be freely rotatable. Reference numeral 5 denotes a seat bottom 5 mounted on the base frame 4, and a sleeve 6 is attached to form a seat. Reference numeral 7 designates a seat lock having one side 7a connected to the lower end 3a of the breakover arm 3 and the other side 7b connected to the base frame 4 side. ) can be freely expanded and contracted by appropriately operating the breakover arm 3 to prevent rotation of the breakover arm 3 at a predetermined length, and the seat back 1 can be tilted rearward at a desired angle and the tilted position can be fixed. , and the reclining operation of the seat back 1 can be controlled.

As shown in FIG. 2, the breakover arm 3 has a connecting edge 3b on the rear end side, a substantially U-shaped cross section, and an inverted triangular fan-shaped section toward the upper end side 3c. is formed inside the lower end portion 2a of the seat back frame 2.
is inserted into the breakover arm 3, passing through it from one side to the other at a substantially central portion thereof, and is rotatably fixed to the base frame 4 by a rotation shaft 9 common to both. Therefore, the breakover arm 3 is supported by the rotating shaft 9 and rotates in the front-rear direction, and the seat back frame 2 rotates in the front-rear direction on the same axis. Arc-shaped forward tilting grooves 10 that open toward the front end along the rotating direction of the seatback frame 2 are formed in the fan-shaped portion of the breakover arm 3 having the above structure, that is, above the pivot support by the rotating shaft 9. At the same time, a pair of bearings 11, 11 are alternately interposed so as to be in sliding contact with the inner and outer end surfaces of the breakover arm 3 at least in the portion where the forward tilting groove 10 is formed, and these bearings are connected to the seat back frame via the forward tilting groove 10. 2. Fasteners such as bolts and nuts 1.
2 with appropriate clamping pressure and fixed integrally. By adjusting the tightening pressure of the fastener 12, the frictional force of the sliding portion of the bearing 11 against the end surface of the breakover arm 3 is adjusted, and the breakover arm 3 of the seat back frame 2 is tightened.
The anti-impact load force can be variably adjusted. Therefore, the seatback frame 2 is normally firmly clamped and fixed to the rear end of the forward tilting groove 10 of the breakover arm 3.
It performs a reclining motion together with the breakover arm 3.

Further, when an impact load of more than a predetermined value is applied to the seat back 1 from the rear to the front, the fastener 12 moves from the rear end side to the front end open side in the forward tilting groove 10 toward the end surface of the breakover arm 3. The opening portion 10a of the forward tilting groove 10 rotates while absorbing the impact load due to the frictional force of the bearing 11 against the
is released to the front of breakover arm 3,
The seat back 1 is tilted to the 5th surface of the seat bottom by inertia. Reference numeral 13 denotes a pair of bearings 11 that are in sliding contact with the inner and outer end surfaces of the breakover arm 3.
A pair of spacers arranged inside and outside of the breakover arm 3 to prevent the occurrence of positional deviation of the bearing 11 when returning the seat bag 1 that has fallen forward to its original usage position. The end surface of the seat back frame 2 can be easily inserted between the bearings 11, 11 of the seat back frame 2.

As shown in the schematic diagram of FIG. 4, the width of the spacer 13 is such that the gap T between the pair of bearings 11, 11 that sandwich the end surfaces of the breakover arm 3 is slightly larger than the plate thickness t of the breakover arm 3. formed to a narrow size (T<t), and
The end face of the breakover arm 3 may be configured to have a chamfer or a radius formed on the edge where it engages, so that re-engagement between the two is facilitated.

FIG. 5 shows a stop member 14 that restricts the forward tilting range of the seatback frame 2, and is constructed by protruding a bolt or pin in front of the rotation shaft 9 of the breakover arm 3. With this configuration, the front edge of the seat back frame 2 comes into contact with the stop member 14, and the seat back frame 2 can be braked within the forward tilting groove 10.

Further, by fitting a cylindrical collar or the like having different wall thicknesses into the stop member 14, the forward tilt angle of the seat back 1 can be variably adjusted without changing the component of the stop member 14.

[Effect of idea]

Since the seatback forward tilting device according to the present invention is configured as described above, the formation width of the breakover arm is reduced to allow the breakover arm to protrude into the seat without impairing the function of reducing the impact load force caused by the forward tilting action of the seatback. This improves the comfort of the seat.

In addition, the weight of the breakover arm itself can be reduced, and it can also be made smaller as a component, making it easier to correct irregularities caused by distortion of the breakover arm that occurs during heat treatment, for example. .

Furthermore, since the seat back can be folded forward to the bottom surface of the seat, these seats can be stored and stored even in a narrow storage space between the upper and lower seats, and the practical effects of implementing the present invention are extremely large.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing an embodiment of the seatback forward tilting device according to the present invention, Fig. 2 is a side view of the main part, Fig. 3 is a front view of the main part, and Fig. 4 is a front view of the main part. 5 is a side view of the main part of the stop member, FIG. 6 is an enlarged plan view of the main part of the breakover arm, and FIG. 7 is a front view of the main part. 2... Seat back frame, 3... Breakover arm, 9... Rotating shaft, 10... Groove for tilting forward, 11... Bearing, 12... Fastener, 13
... Spacer, 14 ... Stopping member.

Claims (1)

[Claims for Utility Model Registration] (1) The lower end of the seatback frame is inserted into the inside of the breakover arm, which has a connecting edge on the rear end side and has a substantially U-shaped cross section, and moves forward in the front-rear direction. The breakover arm is rotatably supported, and an arc-shaped forward tilting groove that opens toward the front end along the rotating direction of the seatback frame is formed on the upper end side end surface of the breakover arm, and at least A bearing is inserted in the groove forming part to slide on the inner and outer end surfaces of the breakover arm, and furthermore, fasteners such as bolts and nuts are passed through the bearing and the end surface of the seatback frame through the forward tilting groove, and these are superimposed. A seatback forward tilting device characterized in that a sliding contact portion is tightened with appropriate tightening pressure. (2) The seatback forward tilting device according to claim 1, characterized in that a spacer is interposed between the bearings slidingly in contact with the inner and outer end surfaces of the breakover arm to regulate the minimum distance between the two bearings. (3) The seatback forward tilting device according to claim 1, characterized in that a seatback frame forward tilting stop member is provided protruding from the front end of the breakover arm.