JPH10250435A - Retracting deivce for vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a seat to surely retract when a vehicle is in head-on collision, and improve ejection of a seated person in a seat, by adding a part of relatively simple shape. SOLUTION: In this device, on a floor 11a, a lower rail 16a is arranged to extend in an advancing direction of a vehicle, an upper rail 17a fixed to a seat cushion 13a, so as to be opposed to the lower rail 16a, is mounted movably in a longitudinal direction in the lower rail 16a. An elastic unit 18 energizing the upper rail 17a in an advancing direction is interposed between the lower/ upper rails 16a, 17a, and a plurality of locked parts 36a are provided along the lower rail 16a by providing a prescribed space. A lock fixture 37 selectively lockable to a plurality of the locked parts 36a is pivotally mounted in the upper rail 17a, and this lock fixture 37 is constituted so as to permit the upper rail 17a retracted against elastic force of the elastic unit and impede advancing by elastic force of the elastic unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically retreating a seat when a frontal collision of a vehicle occurs.

[0002]

2. Description of the Related Art As a retreating device of this kind, the present applicant has
A large number of locked holes are provided on the lower rail fixed to the floor, and a seat cushion is attached to the upper rail slidably disposed on the lower rail so as to face the steering column. A utility model registration application has been filed for a device for automatically retreating a vehicle driver's seat in which an adjusting handle having a locking claw that can be locked to the upper rail is rotatably attached to the upper rail (Japanese Utility Model Application Laid-Open No. 7-11437). In this device, the locking claw is formed so as to be tapered toward the locked hole, and the rear edge of the locking claw is inclined at a predetermined angle with respect to the direction in which the locking claw is locked. .

In the thus configured device for automatically retreating the vehicle driver's seat, when the vehicle collides from the front, the steering column moves rearward and pushes the cushion frame. At this time, since the rear edge of the locking claw is inclined with respect to the direction in which the locking claw is locked, the locking claw slides and separates from the locked hole. As a result, the cushion frame moves rearward together with the seat cushion and the seat back, so that the driver can easily escape from the colliding vehicle.

[0004]

However, in the above-described conventional device for automatically retreating the driver's seat for a vehicle, the allowable range of the inclination angle of the rear side edge of the locking claw is extremely narrow, and the locking claw has high precision. Therefore, there are problems that the number of processing steps of the locking claw increases and that the quality of the locking claw must be strictly checked. SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle seat retreating device that can reliably retreat a seat at the time of a frontal collision of a vehicle by adding relatively simple parts, and can improve escape of a seat occupant. is there.

[0005]

The invention according to claim 1 is
As shown in FIGS. 1 and 3, the vehicle 10 is placed on a floor 11a.
A pair of lower rails 16 extending in the traveling direction of
a, 16b, and the seat cushion 1 of the seat 13 so as to face the lower rails 16a, 16b, respectively.
3a, a pair of upper rails 17a, 17b respectively attached to the pair of lower rails 16a, 16b so as to be movable in the front-rear direction, and a pair of lower rails 16a, 16b.
An elastic body 18 interposed between the upper rails 17a and 17b and biasing the upper rails 17a and 17b in the forward direction, and provided at predetermined intervals along the lower rails 16a and 16b or the upper rails 17a and 17b. A plurality of locked parts 36a and upper rails 17a, 17b
Alternatively, the upper rail 1 is configured so as to be pivotally attached to the lower rails 16a and 16b and selectively lockable to the plurality of locked portions 36a.
A vehicle seat retraction device including a locking member 37 that allows the members 7a and 17b to retreat against the elastic force of the elastic member 18 and prevents the members 7a and 17b from moving forward by the elastic force of the elastic member 18. . The characteristic configuration is that when a rearward load F equal to or more than a predetermined value acts on the seat cushion 13a, the upper rails 17a and 17b retreat against the elastic force of the elastic body 18, and the locking members 37 The upper rails 17a and 17b are configured to be held at the retracted positions by selectively locking the stoppers 36a.

[0006] In the vehicle seat retreating device according to the first aspect, the front cushion of the vehicle 10 enters the passenger compartment due to the front collision of the vehicle 10, whereby the seat cushion 13 a is provided.
When a rearward load equal to or more than a predetermined value acts on the upper rails 17a and 17b, the upper rails 17a and 17b retreat against the elastic force of the elastic body 18, and the locking members 37 are sequentially moved rearward as the upper rails 17a and 17b retreat. Since the upper rails 17a, 17b are retained at the retracted positions, they are locked to 36a.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIGS. 1 to 5, a cab 11 of a cab-over type truck 10 has a steering column 1 for rotatably holding a steering shaft.
A driver's seat 13 is provided to face the vehicle 2, and the driver's seat 13 is attached to the floor 11 a via a retreat device 14. The driver's seat 13 is a seat cushion 13 for receiving the driver's buttocks.
a and a seat back 13c attached to the rear end of the seat cushion 13a via a reclining adjuster 13b to receive the back of the driver (FIGS. 1, 2, and 5). A cushion frame 13d in which a round pipe is formed in a square frame shape is built in a lower portion of the seat cushion 13a (FIGS. 3 and 4). The retraction device 14 includes a pair of lower rails 16a and 16b, which extend in the traveling direction of the truck 10 on the floor 11a, and a pair of lower rails 16a and 16a.
6b so as to face each other.
And a pair of upper rails 17a, 17b fixed to the lower rail 16a,
An elastic body 18 is interposed between the upper rail 16b and the upper rails 17a, 17b (FIGS. 1 to 4).

The lower rails 16a and 16b are connected to the floor 11a.
It is attached via a seat leg 21 and a seat bracket 22 (FIGS. 1 and 2). Lower rail 16a,
A single roller housing 23 and a pair of steel ball housings 24, 24 are formed between the upper rail 16b and the upper rails 17a, 17b (FIG. 4). A roller 27 (FIGS. 1, 2 and 4) rotatably mounted on each of the upper rails 17a and 17b via a roller bracket 26 is accommodated in the roller accommodating portion 23.
The upper rails 17a, 17b are rolled on the roller rolling surface 16c of the lower rails 16a, 16b.
6b is configured to be movable along the longitudinal direction. The roller 27 is mounted on the pair of upper rails 17a and 17b respectively.
They are attached individually (FIGS. 1 and 2). A pair of steel balls 28.28 for preventing rattling in the width direction and the vertical direction between the lower rails 16a, 16b and the upper rails 17a, 17b are respectively stored in the pair of steel ball storage portions 24, 24 (FIG. 4). .

The seat track 19 has a pair of lower rails 19a and 19b fixed to the upper surfaces of the pair of upper rails 17a and 17b by rivets 29 (FIG. 3), respectively.
A pair of upper rails 19c, 19d fixed to the seat cushion 13a via the first and second connection brackets 31, 32 (FIGS. 3 and 4) so as to face the pair of lower rails 19a, 19b, respectively. (FIGS. 1 to 4). The lower rails 19a, 19b and the upper rails 19c, 19d are formed in the same shape as the lower rails 16a, 16b and the upper rails 17a, 17b, respectively.
Lower rails 19a, 19b and upper rails 19c, 19
Between d, a roller housing 19e and a steel ball housing 19f having the same shape as the roller housing 23 and the steel ball housing 24 are formed, respectively. In addition, these accommodation sections 19e, 19f
Is a roller 1 having the same shape as the roller 27 and the steel ball 28.
9g and a steel ball 19h are accommodated respectively.

At the front end and the rear end of the roller rolling surface 16c of the lower rails 16a, 16b, upper rails 17a, 17b are provided.
Forward stopper (not shown) and backward stopper (not shown) for determining the most advanced position and the most retracted position of the
Are protruded, and the upper rails 19c and 19c are also provided at the front end and the rear end of the roller rolling surface 19i of the lower rails 19a and 19b.
A forward stopper (not shown) and a backward stopper (not shown) for determining the most advanced position and the most retracted position of 19d are respectively protruded. In this embodiment, the elastic body 18 is a compression coil spring, and the pair of lower rails 16 is used.
a, 16b, rear bracket 33 erected on the lower surface of the rear end
And a front bracket 34 installed on the front side surfaces of the pair of upper rails 17a, 17b (FIGS. 1 to 4). This elastic body 18 is used for the upper rail 17.
a, 17b are urged in the forward direction, and when a backward load F (FIG. 2) of a predetermined value or more acts on the driver's seat 13, the upper rails 17a, 17b move backward against the elastic force of the elastic body 18. It is configured to

A rail stopper 36 projecting outward and extending along the longitudinal direction of the rail 16a is fixed to the bottom surface of one of the lower rails 16a, 16b by a rivet 35 (FIGS. 1 to 1). 3). The rail 1 is provided on the outer upper surface of the rail stopper 36.
6a at a predetermined interval in the longitudinal direction.
6a, a plurality of locked portions 36a are provided on one upper rail 17a facing the one lower rail 16a.
A single locking member 37, which can be selectively locked to the vehicle, is pivotally connected via a pin 38. The locked portion 36a is a concave portion formed in a substantially V shape. The front surface 36b of the locked portion 36a is formed on an upright surface extending in a substantially vertical direction, and the rear surface 36c is a slope that rises gently toward the rear. (FIGS. 1 and 2).

The locking member 37 is bent in a substantially inverted L-shape, and the center of the locking member 37 is connected to the upper rail 17 via the pin 38.
a. A tension coil spring 39 is stretched between the other end of the locking member 37 and the upper rail 17a. One end of the locking member 37 is pressed against the front surface 36b of the locked portion 36a by the elastic force of the elastic body 18 and the rear surface 3 of the locked portion 36a by the elastic force of the tension coil spring 39.
6c, the locking tool 37 is configured to be selectively locked to the plurality of locked portions 36a. When a load F of a predetermined value or more that retreats against the elastic force of the elastic body 18 acts on the upper rail 17a, the locking member 37 is successively engaged with the rear locked portion 36a by the elastic force of the tension coil spring 39. While stopping, it retreats together with the upper rail 17a.
It is configured to allow b to retreat.

A plate 41 with a hole is interposed between the other upper rail 17b and the lower rail 19b, and a number of square holes are formed in the plate 41 along the longitudinal direction of the rails 17b and 19b. 41a are formed (FIG. 3). A base end of a handle holder 42 is fixed to the upper surface of the other upper rail 19d.
Is bent in a ring shape. This handle holder 4
An adjustment handle 43 is rotatably inserted into the distal end bent into a ring shape. A base end of a claw member 44 is fixed to the adjustment handle 43, and a distal end of the claw member 44 is bent so as to be selectively inserted into the plurality of square holes 41a. A torsion coil spring (not shown) is wound around the adjustment handle 43, and this spring urges the adjustment handle 43 to rotate in a direction of inserting the claw member 44 into the square hole 41a. On the other hand, as shown in detail in FIG. 5, the steering column 12 is supported by a dash panel 46 in front of the driver's seat 13 via a column support bracket 47, and a steering shaft 48 protruding from the upper end of the steering column 12 is provided with a steering wheel 48. It is fixed.

In this embodiment, a cab-over type truck is used as a vehicle, but a passenger car or another vehicle may be used. Further, in this embodiment, a compression coil spring has been described as an elastic body, but a tension coil spring or another elastic body may be used as long as it can be urged in the direction in which the upper rail is advanced. Further, in this embodiment, a plurality of locked portions are provided on the lower rail, and the locking device is pivotally mounted on the upper rail.However, a plurality of locked portions are provided on the upper rail, and the locking device is mounted on the lower rail. You may. Further, in this embodiment, the seat track is mounted on the upper surface of the upper rail, but the seat track may be mounted on the lower surface of the lower rail.

The operation of the retreating device 14 of the driver's seat 13 of the truck 10 will be described. Track 10
When the vehicle collides with the front, the front of the cab 11 of the truck 10 enters the passenger compartment, and the steering column 12 retreats, and this column 12 pushes the seat cushion 13a of the driver's seat 13 backward. At this time, the seat cushion 13a
Is applied to the upper rails 17a and 17b against the elastic force of the elastic body, and the locking members 37 are sequentially moved as the upper rails 17a and 17b are retracted. It is locked to the rear locked portion 36a. As a result, since the upper rails 17a and 17b are held at the retracted positions, the driver's seat 13 can be reliably retracted, and the escape property of the driver can be improved. In this embodiment, the retraction device is provided on the driver's seat, but may be provided on the passenger seat.

[0016]

As described above, according to the present invention, a pair of upper rails fixed to a seat cushion are mounted on a pair of lower rails disposed on a floor so as to be movable in the front-rear direction, and the upper rail is advanced. An elastic body that urges in the direction is interposed between the lower rail and the upper rail, and a locking member that can be selectively locked to a plurality of locked portions provided on the lower rail or the upper rail is pivotally attached to the upper rail or the lower rail. Further, since the locking device is configured to allow the upper rail to retreat and prevent the upper rail from moving forward, the frontal collision of the vehicle causes the front of the vehicle to enter the passenger compartment,
When a rearward load equal to or more than a predetermined value acts on the seat cushion, the upper rails retreat against the elastic force of the elastic body,
As the upper rail retreats, the locking tool sequentially locks on the rear locked portion, so that the upper rail is held at the retracted position. As a result, the seat can be reliably retracted at the time of a frontal collision of the vehicle, and the occupant of the seat can easily escape.

In addition, the number of man-hours required for processing the locking claws, which require high precision, is increased, and compared with a conventional device for automatically retreating a driver's seat for a vehicle, which requires strict checking of the quality of the locking claws. Thus, in the present invention, it is sufficient to add a component having a relatively simple shape. Further, when the vehicle is collided, a rearward load equal to or more than a predetermined value acts on the seat, so that the seat moves backward together with the upper rail against the elastic force of the elastic body. As a result, the elastic body absorbs the load, so that the impact of the seat on the occupant can be reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a portion B in FIG. 5 showing a vehicle seat retreating device according to an embodiment of the present invention.

FIG. 2 is a side view corresponding to FIG. 1, showing a state in which an upper rail has moved rearward together with a seat.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a cross-sectional configuration diagram of a cab of a truck including a driver's seat showing a state before a frontal collision occurs.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Truck (vehicle) 11a Floor 13 Driver's seat (seat) 13a Seat cushion 16a, 16b Lower rail 17a, 17b Upper rail 18 Elastic body 36a Engagement part 37 Engagement tool F A rearward load acting on a seat cushion of a predetermined value or more.

Claims (1)

[Claims] 1. A pair of lower rails (16a, 16b) extending on a floor (11a) in the traveling direction of a vehicle, and a seat (13) facing the pair of lower rails (16a, 16b). ), A pair of upper rails (17a, 17b) fixed to the seat cushion (13a) and attached to the pair of lower rails (16a, 16b) so as to be movable in the front-rear direction.
And the lower rail (16a, 16b) and the upper rail (17a, 17b)
An elastic body (18) interposed between the lower rail (16a, 16b) and the upper rail (17a, 17b) to urge the upper rail (17a, 17b) in a forward direction.
b) a plurality of locked parts (36a) provided at predetermined intervals along the upper rail (17a, 17b) or the lower rail (16a, 16
The upper rails (17a, 17b) are configured to be pivotally attached to the b) and selectively lockable to the plurality of locked portions (36a), and the upper rails (17a, 17b) are retracted against the elastic force of the elastic body (18). (3) that allows the elastic member (18) to move forward
7), wherein the upper rails (17a, 17b) are provided with the elastic member (17a, 17b) when a backward load (F) of a predetermined value or more is applied to the seat cushion (13a). 18) retreats against the elastic force of the upper rails (17a, 17b) retracted by selectively locking the locking members (37) to the plurality of locked portions (36a). A vehicle seat retreat device configured to be held by a vehicle.