JPH075901U - Seat suspension system - Google Patents

Abstract

(57) [Abstract] [Purpose] In a seat suspension device in which an upper frame on which a seat is placed and fixed is elastically supported by a lower frame fixed on the floor side via a link mechanism and an air spring. , When exiting, the air in the air spring is rapidly exhausted so that the seat descends at a high speed so that the passenger can descend smoothly. An exhaust groove 33 is newly formed in a shaft 20 of an air valve 18 for discharging the air in the air spring to expand a passage of the air so that the air in the air spring is rapidly discharged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seat suspension device applied to a vehicle seat or the like, and more particularly to an air suspension using an air spring as its elastic support member.

[0002]

[Prior art]

 First, the configuration of a general seat suspension device will be described with reference to FIG. In the figure, 1 is an overall seat suspension device applied to a vehicle seat (particularly a driver's seat), 2 is a lower frame, and 3 is an upper frame. The lower frame 2 is fixed to the floor of the vehicle body, while a seat (not shown) is placed and fixed to the upper frame 3.

The upper frame 3 is supported on the lower frame 2 so as to be vertically movable via a pair of left and right X-shaped link mechanisms 4. That is, the X-shaped link mechanism 4 pivotally connects the two link members 5 and 6 in an X-shape by the pivot 7 at the central portion, and one end of one of the link members 5 is attached to the lower frame 2 via the support shaft 8. In addition to being connected to the rear part, the other end is connected to the front part of the upper frame 3 so as to be movable in the front-rear direction via the support shaft 9 and the roller 10 attached to the support shaft 9, and the other link member. One end of 6 is connected to the rear part of the upper frame 3 via a support shaft 11, while the other end is connected to the front part of the lower frame 2 via a support shaft 12 and a roller 13 attached to the support shaft 12. The upper frame 3 is vertically moved (moved up and down) with respect to the lower frame 2 by the rotation of the link members 5 and 6 constituting the X-shaped link mechanism 4. ing.

In the seat suspension device 1, the air spring 14 is used as a member for elastically supporting the upper frame, that is, the seat. The air spring 14 is arranged between the bottom plate 15 of the lower frame 2 and the bracket 16 fixed over the left and right link members 5 and 5, and when the occupant is seated on the seat, By compressing the air inside the air spring 14 by the load, an elastic support feeling is given.

Further, the seat suspension device 1 is provided with a holding mechanism 17 for always keeping the upper frame 3, that is, the seat at a constant height. The holding mechanism 17 includes an air valve 18 that supplies and discharges air to and from the air spring 14, and a cam plate 21 that operates the air valve 18.

As shown in FIG. 2, the air valve 18 has a shaft 19 for supplying air and a shaft 20 for discharging air, and the tips of these shafts 19 and 20 face the cam surface of the cam plate 21. is doing. The cam plate 21 is attached to the support shaft 8 so as to be rotated in conjunction with the link member 5, and the cam surface of the air valve 18 facing the shafts 19 and 20 is provided with a cam convex portion 22 for air supply operation at an upper portion. A cam protrusion 23 for air discharge operation is formed in the lower part.

When the occupant is seated on the seat and the upper frame 3 is lowered by the load, the cam plate 21 is also rotated downward in conjunction with the link member 5, and the cam convex portion 22 on the upper portion supplies the air. The operation shaft 19 is pushed in the retracting direction, whereby compressed air is supplied from the air pump into the air spring 14 and the air spring 14 extends, and as a result, the upper frame 3 or the seat rises.

When the upper frame 3 is lifted, the cam plate 21 is also rotated upward in conjunction with the link member 5, and the cam projection 23 at the lower part thereof pushes the shaft 20 for ejecting air in the retracting direction. The operating condition is reached (FIG. 2B), which causes the air spring 14 to contract, which results in the lowering of the upper frame 3 or seat. In this way, the seat suspension device 1 has a structure in which the seat is always adjusted to a constant height regardless of the weight of the seated person.

FIG. 3 shows the internal structure of the air valve 18. The structure of the air discharge mechanism of the air valve 18 will be described. The air discharge shaft 20 has a required clearance in the through hole 25 communicating with the air spring. It is slidably arranged, and its tip projects to the outside. An air discharge port 26 is provided in communication with the through hole 25, and the air from the air spring is discharged to the outside through the gap between the shaft 20 and the inner surface of the through hole 25. It is supposed to be done.

The shaft 20 has circumferential recessed grooves 27 and 28 at two locations, a central portion and a distal end portion, and O-rings 29 and 30 are fitted in the recessed grooves 27 and 28, respectively. The O-ring 29 at the center of the shaft 20 is always in close contact with the inner surface of the through hole 25 so as to seal the gap between the shaft 20 and the through hole 25, while the O-ring 30 at the end of the shaft 20 is sealed. Is configured so as to close a passage between the shaft 20 and the through hole 25, that is, an air discharge port 26 by contacting a step portion 31 provided in the middle of the through hole 25. The shaft 20 is always biased by the force of the compression coil spring 32 in the direction in which the O-ring 30 abuts on the step portion 31.

Then, as described above, when the upper frame 3 of the seat suspension device 1 rises and the shaft 20 is pressed by the cam convex portion 23 of the cam plate 21, the shaft 20 is pushed against the force of the compression coil spring 32. As a result, the O-ring 30 is separated from the step portion 31, whereby the air passage is opened, and the air in the air spring is discharged from the exhaust port 26 to the outside.

[0012]

[Problems to be solved by the device]

 In an automobile seat to which the seat suspension device 1 having the above-described configuration is applied, when the user lifts his / her waist from the seat when getting off, the upper frame 3 is lifted by the action of the air spring 14 and the seat is put on the body. I will follow. Then, when the shaft 20 of the air valve 18 is pushed in by the cam convex portion 23 of the cam plate 21 thereafter, the air in the air spring 14 is discharged as described above, and the seat is operated to descend. The descending speed of the seats is extremely slow, which makes it impossible to get off smoothly.

That is, conventionally, the air passage (the gap between the shaft 20 and the through hole 25) of the air discharge mechanism of the air valve 18 is very narrow, so the air in the air spring 14 is slowly discharged. Therefore, the descending speed of the seat is slow. For this reason, the handle of the trolley interferes with the thighs when getting off the vehicle, which hinders the user's ability to get off smoothly without waiting until the seat is fully lowered.

The present invention has been made for the purpose of improving such problems.

[0015]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a seat that elastically supports, via a link mechanism and an air spring, an upper frame on which a seat is placed and fixed to a lower frame fixed on the floor side. In a suspension device, the shaft of an air valve that discharges the air in the air spring is provided with an exhaust groove for rapidly exhausting the air.

[0016]

[Action]

 In this way, by providing the exhaust groove on the air exhaust shaft of the air valve to expel air rapidly, the descending speed of the seat will be faster than in the past, and therefore the handle of the cab will be used when getting off the vehicle. You can get off smoothly without being hindered.

[0017]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 5 and 6. Parts corresponding to those of the above-described conventional example are designated by the same reference numerals and the description thereof will be omitted.

The present invention is a new device for the shaft 20 of the air valve 18 for discharging the air in the air spring. That is, in this example, an elongated slit-shaped exhaust groove 33 is provided on the peripheral surface of the air exhaust shaft 20 from the concave groove 28 into which the O-ring 30 is fitted to the portion corresponding to the exhaust port 26.

As shown in FIG. 6, a plurality of slit-shaped exhaust grooves 33 are formed in the circumferential direction of the shaft 20, and even if the shaft 20 rotates in the through hole 25, any one of the exhaust grooves 33 is discharged. 26.

Further, in this example, two exhaust ports 34 and 35 are newly provided in communication with the exhaust port 26 so that the air can be exhausted more smoothly.

With the above structure, the passage of the air at the time of discharging the air is expanded, so that the air in the air spring is rapidly discharged to the outside, so that the seat is faster than before. Will be lowered. Therefore, unlike the conventional case, the steering wheel of the driver's cab does not interfere with the thighs when the vehicle gets off, and it is possible to get off smoothly.

Although an embodiment of the present invention has been described below, the present invention is not limited to the configuration and shape of this embodiment. For example, in the embodiment, a plurality of slit-shaped exhaust grooves 33 are formed on the peripheral surface of the shaft 20, but the exhaust grooves 33 are formed over the entire circumference of the shaft 20, and this portion has a small diameter immediately. It may have a shaft shape.

[0023]

[Effect of device]

 INDUSTRIAL APPLICABILITY As described above, the present invention provides a seat suspension device in which an upper frame on which a seat is mounted and fixed is elastically supported by a lower frame fixed on the floor side via a link mechanism and an air spring. Since the shaft of the air valve that discharges air in the air spring is provided with an exhaust groove for rapidly discharging air, the seat descending speed will be faster than before, so it is recommended You will be able to get off smoothly without being obstructed by the steering wheel of the cab like you used to. Further, since the present invention is basically an extremely simple structure in which a groove is formed on the air exhaust shaft of an existing air valve, it can be realized at a low processing cost required for forming the groove. Is also a great effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a seat suspension device.

FIG. 2 is an explanatory diagram of a main part of a seat suspension device.

FIG. 3 is a vertical sectional view of an air valve showing a conventional example.

4 is an explanatory view of an air exhaust shaft in the air valve of FIG. 3, where A is a side view and B is a cross-sectional view thereof.

FIG. 5 is a vertical sectional view of an air valve showing an embodiment.

6 is an explanatory view of an air discharge shaft in the air valve of FIG. 5, A is a side view, and B is a transverse sectional view thereof.

[Explanation of symbols]

 1 Seat Suspension Device 2 Lower Frame 3 Upper Frame 4 X-Link Mechanism 14 Air Spring 18 Air Valve 20 Air Discharge Shaft 21 Cam Plate 26 Discharge Port 33 Exhaust Groove

Claims (1)

[Scope of utility model registration request] 1. A seat suspension device in which an upper frame on which a seat is placed and fixed is elastically supported by a lower frame fixed on the floor side via a link mechanism and an air spring. A seat suspension device characterized in that a shaft of an air valve for discharging air therein is provided with an exhaust groove for rapidly discharging air.