JPH02117445A - Seat with suspension system - Google Patents

Abstract

PURPOSE:To enable a slow walk-in motion by connecting the front end of a lower frame of a suspension system on the underside of a seat part of a seat body pivotably to a fixed frame provided on a car body floor so that the seat body together with the suspension system can be brought down forward. CONSTITUTION:When a passenger on a rear seat in a vehicle gets on and out and an operating lever or pedal 24b of a floor lock mechanism 23 is operated, a lock pawl 26 together with an operating beam 24 is pivoted against a return spring to be disengaged from a lock pin 27. Then, a seat body 1 together with a suspension system 7 is kicked up forward pivotably about a shaft 20a on the front end of a lower frame 9 by a lifting spring 20 of a suspension spring 7 beneath said body 1 to be set to a walk-in condition. This, walk-in motion is slowly performed since a damping force against the lifting spring 20 works between an upper frame 8 and a fixed frame 22 by the action of a shock absorber 21 of the suspension system 7.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a suspension that is installed and used mainly in the driver's seat or passenger seat of a luggage vehicle (truck) or a vehicle that travels on rough roads (jeep, etc.). Regarding a seat with a device.

(Prior Art) Conventionally, this type of seat with a suspension device has been disclosed in Japanese Utility Model Publication No. 57-15729 and Japanese Utility Model Application Publication No. 62-978.
There is one as shown in Publication No. 39. In order to improve sitting comfort, this vehicle is equipped with a suspension device for absorbing vibrations via a slide device for longitudinal position adjustment under the seat portion (seat cushion) of the seat body. The suspension device generally includes a lower frame fixed to the vehicle floor, an upper frame attached to the lower side of the seat via a slide device, and an X-link mechanism attached between the lower frame and the upper frame. It also includes a push-up spring and a shock absorber.

In addition, in this type of seat with a suspension device, the inner buckle of the seat belt is directly attached to the seat frame in consideration of restraint against vertical movement of the suspension device and ease of mounting.

(Problems to be Solved by the Invention) Incidentally, in recent vehicles traveling on rough roads, an increasing number of vehicles are equipped with the above-mentioned suspension device seat on both the driver's seat and the passenger seat. For this reason, there is no rear door 2
2. Description of the Related Art In door type vehicles (for example, wagon short body vehicles), it has become necessary to provide a walk-in mechanism in the front seat (mainly the passenger seat) with a suspension device. Conventionally, the walk-in mechanism is such that when a lever is operated, the seat body slides forward via a slide device by the biasing force of a spring, and the backrest (seat pack) also falls forward by the biasing force of the spring. This configuration makes it easy to get in and out of the rear seats.

However, even if such a conventional walk-in mechanism is applied to the seat with the suspension device, and the seat body is slid forward and the backrest is folded forward, the seat with the suspension device of this type does not allow the lower part of the seat to The relatively high front suspension device of the vehicle remained in a state that protruded to the rear, which caused a problem in that a large space could not be obtained on the back side, which obstructed getting in and out of the rear seats. In addition, in conventional walk-in mechanisms, the forward sliding of the seat body and the forward tilting of the backrest are both done at once by the biasing force of the spring, so the movement is sudden and there is a strong collision with the stopper at the end of the operation. In addition to generating a large impact noise, the seatbelt is suddenly pulled and the seatbelt retractor becomes locked, causing the walk-in operation to become stuck and stop midway.

The present invention was developed in view of the above circumstances, and allows for a slow walk-in operation, eliminates the occurrence of loud impact noises and seatbelts getting caught in the middle, and also eliminates the suspension device from getting in the way and has a large seatbelt on the back side. To provide a seat with a suspension device that can secure space and allow easy getting on and off from a rear seat.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the seat with a suspension device of the present invention has the front end of the lower frame of the suspension device under the seat of the seat body fixed to a fixed frame provided on the vehicle floor. By being pivotally connected via a shaft, the seat body and the suspension device can be tilted forward, and a floor lock mechanism for restricting forward tilting is provided at the rear end of the lower frame so that it can be released. Features.

The shaft that pivotally connects the front end of the lower frame of the suspension device to the fixed frame is a torsion spring that also serves as a push-up spring for the suspension device, and the shock absorber of the suspension device is provided between the upper frame and the fixed frame. It is desirable to install it.

(Function) With the above configuration, in the seat with the suspension device of the present invention, when the lock mechanism is released, the seat body and the suspension device under the seat can be flipped up and rotated forward via the shaft at the front end of the lower frame. You will be able to move things forward slowly and be in a walk-in state. This way, the suspension system does not remain and get in the way, and a large space can be secured on the back side, making it easier to get in and out of the rear seats. The catch will disappear.

Note that by using the shaft as a torsion spring that also serves as a push-up spring of the suspension device, it is possible to suppress an increase in the number of parts and to simplify the structure and reduce the weight. In addition, the torsion spring that also serves as the shaft acts to flip the seat body (including the suspension device) forward during walk-in, and the shock absorber of the suspension device is installed between the upper frame and the fixed frame to Since it acts as a buffer against the torsion spring, the walk-in operation is automatically performed slowly. This not only eliminates loud impact noises and seatbelts getting caught in the middle, but also provides a sense of luxury and safety due to the slow walk-in motion.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, reference numeral 1 indicates a seat body, which is composed of a seat portion (seat cushion) 2 and a backrest portion (seat back) 3. The seat part 2 has a structure in which a cushion body (not shown) is placed over a seat frame 2a made of a pair of left and right steel plates and front and rear round pipes, and a backrest part 3
A backrest frame 3 is erected on the rising parts of the left and right rear ends of the seat frame 2a so that the angle can be adjusted by connecting the lower parts of both sides via the hinges 4 and 5 of the reclining device.
This is a structure in which a cushion body (not shown) is placed over the cushion body (a).

Here, as shown in FIGS. 1 and 4, the sheet main body 1
A suspension device 7 for absorbing vibrations is provided below the seat portion 2 via a slide device 6 for longitudinal adjustment.

The slide device 6 includes a pair of left and right upper rails 6a that also serve as left and right plates of the seat frame 2a, and a pair of left and right lower rails 6b that slide into the left and right upper rails 6a.
Although not shown in the drawings, it is comprised of a locking means for positioning the upper rail 6a longitudinally with respect to the lower rail 6b, a lock release operation lever thereof (both of which are known), and the like.

The suspension device 7 includes an upper frame 8;
The main components include a lower frame 9 and an X-link mechanism 10 interposed between the upper frame 8 and the lower frame 9.

The upper frame 8 serves as the left and right lower rails 6b of the slide device 6, and has a rectangular frame shape between which a pair of front and rear support frame members 11 made of channel material are welded.
The front and rear support frame members 11 each have a link attachment round hole 11a formed near one end, and a link attachment elongated hole 11b formed near the other end. The lower frame 9 has a rectangular frame shape in which a pair of front and rear support frame members 13 made of channel material are welded between left and right frame members 12 made of angle material, and the front and rear support frame members 13 are also welded in the same manner as described above. A link attachment round hole 13a and a link attachment elongated hole 13b are formed.

The X-link mechanism 10 has a pair of links 1 in the shape of a rectangular frame.
4.15 were conventionally arranged so that their mutual rotation axes faced in the left-right direction, but here they are arranged so as to face in the front-rear direction, and the front-rear support frame member 11 of the upper frame 8 and lower frame 9 is It is pivotally connected to ゜13. In other words, this X-link mechanism 10 includes a pair of link pars 14a at the front and rear, each made by press-forming a steel plate.

14b and 15g, 15b and its front and rear link par 14
A and 14b and 15a and 15b are connected at the upper and lower ends of round pipe-shaped connecting parts 14c, 14d and 15c, 15d, each forming a pair of rectangular frame-shaped links 14.15, and both links 14 and 1 and 2 are combined so that they form an X shape when viewed from the front, and the linkers 14a and 15a and 14b and 15b of each other are rotated by shaft pins 16, which are stepped bolts, at their intermediate parts. The entire body is constructed by being pivotally connected for free movement. And the front and back links t<-14a, 1 of one of the rectangular frame-shaped links 14
4b to the front and rear support frame member 1 of the lower frame 9.
3 are pivotally connected to the round mounting holes 13a on one end side of the upper frame 8 by connecting pins 17, which are stepped bolts, and the upper ends thereof are respectively stepped to the long mounting holes 11b on the other end side of the front and rear support frame members 11 of the upper frame 8. They are slidably and pivotally connected by a sliding pin 18 which is a bolt. The upper and lower ends of the front and rear link pars 15a, 15b of the other rectangular frame-shaped link 15 are pivotally connected to the lower frame 9 and the upper frame 8 in the same manner, although the directions are opposite. The X-link mechanism 10 is now installed between the upper frame 8 and the lower frame 9, and supports the upper frame 8 in a vertically movable manner. Note that rollers 19 that are transferred into the grooves of the support frame member 11.13 are attached to each of the sliding pins 18 that slide into the long mounting holes 11b and 13b, and the X-link mechanism 10
makes the movement smooth.

Further, the suspension device 7 includes a push-up spring 2 consisting of a pair of torsion springs (torsion springs) to be described later.
0 is provided to constantly push the upper frame 8 upward, and a shock absorber 21 is provided on the negative side to suppress sudden vertical movement of the upper frame 8. .

Here, as shown in FIG. 3, the seat body 1 having the above-mentioned suspension device 7 at its lower part is flipped up and rotated together with the suspension device 7 to bring it into a walk-in state. The lower frame 9 is not fixed to the vehicle floor as in the conventional case, but is rotatably pivoted to a pair of left and right fixed frames 22 at its front end.

In other words, the pair of left and right fixed frames 22 are each made of angle material and are firmly bolted to predetermined positions on the vehicle floor (not shown). Bearing holes 22a, 12a are formed to match the front ends of both frame members 12, respectively, and the proximal end portions of a pair of push-up springs 20 made of torsion springs of the suspension device 7 are inserted through these as shafts 20a. ing. The pair of push-up springs 20 are torsion springs each bent into a substantially U-shaped shape, and are arranged symmetrically so that the push-up springs 20 cross at the front surface. The shaft 20a portion is the left and right bearing holes 22a.

12a to rotatably pivot the lower frame 9 to the fixed frame 22, and each proximal bent portion 20b is locked to the upper surface of the fixed frame 22. The opposite tip-side bent portion 20c is fitted into the notch groove 12b on the upper edge of the front end of the left and right frame members 12 of the lower frame 9 and positioned, and then rises diagonally upward and connects to the upper floor 8.
It is designed to push up and force it upward. That is, the pair of push-up springs 20 performs three functions: the original push-up spring of the suspension device 7, the axis for flip-up and rotation of the entire seat (walk-in by tilting forward), and the spring for the flip-up and rotation. It is designed to serve as both.

Further, the shock absorber 21 of the suspension device 7 is connected to the upper frame 8 so that the entire seat flips up and rotates at a slow speed due to the biasing force of the pair of push-up springs 20.
and a fixed frame 22a via pins 8a and 20b.

Furthermore, in normal conditions, a floor lock 11 mechanism 2 is installed to prevent the seat body 1 from tilting forward and to maintain the seat body 1 in the correct posture.
B is provided. This floor lock mechanism 23 includes a pair of left and right brackets 25 which are attached to the upper rear end of the lower frame 9, and an operating rod 24 having an operating lever 24a at one end and an operating bevel 24b at the other end in a bent state.
This operating rod 24 is rotatably provided through the
A hook-shaped lock pawl 26 that rotates integrally with the frame is provided, and a lock pin 27 to which the lock pawl 26 engages and disengages is provided protruding from the fixed frame 22, and the lock pawl 26 is locked to the lock pin 27. This configuration includes a return spring 28 that holds the position.

Further, the upper frame 8 of the suspension device 7
A push-up spring force adjustment mechanism 29 is provided on the lower side.

This spring force adjustment mechanism 29 includes a camshaft 31 provided at the lower part of the upper frame 8 via a pair of left and right brackets 30.
A disc cam 32 with a V groove cut on the outer circumferential surface at each end.
At the same time, one of the brackets 30 also serves as a gear box, and an adjustment shaft 34 that can rotate the camshaft 31 via a worm gear 33 inside the bracket 30 is protruded forward. The tip bending portions 20c of the pair of push-up springs 20 come into contact with the outer circumferential V-groove portions from below to exert a push-up action, and the push-up force is changed in size by the rotational operation of the disc cam 31. ing.

As shown in FIG. 1, an inner buckle 37 and an outer belt anchor 38 of the seat belt are directly attached to the left and right rear ends of the seat frame 2a of the seat 2 of the seat body 1 by bolts 35 and 36, respectively. . - A seat belt 39 shown in FIGS. 5 and 6 can be attached via these inner buckles 37 and outer belt anchors 38. The shoulder strap of the seat belt 39 is a belt guide 4 provided above the belt portion 39H on the headrest 40 on the backrest portion 2 of the seat body 1.
1 and then to a relay anchor 42 in the upper part of the vehicle interior, and from there to a winding device (not shown) below.
).

In the seat with the suspension device configured as described above, when a passenger in the rear seat of the vehicle gets on or off, the operation lever 24 of the floor lock mechanism 23 is moved from the state shown in FIG.
By operating the operating pedal a or the operating pedal 24b, the operating rod 24
At the same time, the lock pawl 26 rotates against the return spring 28 and is removed from the lock pin 27. The seat body 1, now unlocked, is flipped up and rotated forward via the shaft 20a at the front end of the lower frame 9 by the spring force of the push-up spring 20 of the lower suspension device 7, as shown in FIG. become. This causes the seat body 1 and the suspension device 7 to be moved forward and automatically enter the walk-in state. This eliminates the problem that the suspension device 7 remains protruding to the rear and becomes an obstruction, and a large space can be secured on the back side, making it easier to get on and off the rear seat.

Further, during the walk-in operation, the shock absorber 21 of the suspension device 7 acts as a buffer between the upper frame 8 and the fixed frame 22 against the push-up spring 20, so that the walk-in operation is slowed down. Since the seat body 1 is not moved forward rapidly, there is no risk of large impact noise or danger, and the slow walk-in movement gives a sense of luxury.

Furthermore, since the shaft 20a is a torsion spring that also serves as the push-up spring 20 of the suspension device 7, an increase in the number of parts can be suppressed and the structure can be simplified and the weight can be reduced.

Note that even when three seat belts are fastened as shown in FIGS. 5 and 6, the seat main body 1 performs the walk-in operation at a slow speed as described above, so the seat belt 39 cannot be pulled suddenly. Therefore, there is no possibility that the winding device is locked in the middle of the walk-in operation, and the problem of the seat belt 39 getting caught and stopping in the middle of the walk-in operation is eliminated.

After getting in and out of the rear seat in the walk-in state, if the seat body 1 is raised rearward, the suspension device 7 on the lower side will rotate around the shaft 20a and return to the original correct posture. At the same time, the floor lock mechanism 23 automatically locks, allowing the occupant to sit on the seat body 1 as well.

〔Effect of the invention〕

Since the present invention is configured as described above, when the floor lock mechanism is released, the seat body and the lower suspension device are slowly moved forward to perform a walk-in operation. In addition to eliminating the possibility of getting caught, a large space can be secured on the back side without the suspension device getting in the way.
This seat with a suspension device makes it easy to get in and out of the rear seat, and is very effective in two-door type wagons that do not have a rear door.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a perspective view of the seat with the cushion body omitted, Fig. 2 is a side view of the seat locked in its normal position, and Fig. 3 is a side view of the seat with the seat locked in its normal position. Figure 4 is an exploded perspective view of the main parts; Figure 5 is a side view of the seat in its normal position with a seatbelt; Figure 6 is the same seat. FIG. 3 is a side view of the vehicle being folded forward for walk-in. DESCRIPTION OF SYMBOLS 1... Seat body, 2... Seat part, 7... Suspension device, 8... Upper frame, 9... Lower frame, 20... Push-up spring, 20a... Shaft, 2
1... Shock absorber, 22... Fixed frame, 23... Floor lock mechanism.

Claims (2)

[Claims] (1) In a seat equipped with a suspension device on the underside of the seat body, the front end of the lower frame of the suspension device is pivotally connected via a shaft to a fixed frame provided on the vehicle floor, so that the seat body can be attached to the suspension device. 1. A seat with a suspension device, characterized in that both the device and the device are provided so that the device can be folded forward, and a floor lock mechanism that restricts the device from being tipped forward is provided at the rear end of the lower frame so as to be unlockable. (2) A torsion spring that also serves as a push-up spring of the suspension device is used as a shaft for pivotally connecting the front end of the lower frame to the fixed frame, and a shock absorber is installed between the upper frame of the suspension device and the fixed frame. The seat with a suspension device according to claim 1, characterized in that: