JP2764642B2 - Seat cushion frame structure - Google Patents

Description

The present invention relates to a seat cushion frame structure on which a seat pad is placed to form a seat cushion.

[Related Art] For example, in a seat of a vehicle or the like, a seat cushion is formed of an elastic body such as a urethane foam material which gives a seated person sufficient elasticity on a seat spring formed of an S spring or the like stretched over a seat cushion frame. (Seat pad)
And a seat pad is covered with a trim cover made of a skin or the like.

The seat cushion frame is formed, for example, by connecting and fixing a connecting frame between terminals of a frame body bent in a flat substantially U-shape, and is formed and stretched between left and right sides of the frame body. A seat pad having a shape corresponding to the use of the seat is placed on the spring.

The seat pad is deformed into a corresponding shape by the action of a load or a pressing force applied to the seated part's buttocks or thighs, and supports the seated person with good cushioning properties.

[Problems to be Solved by the Invention] By the way, in general, in a seat of an automobile or the like, a seat cushion is inclined rearward in order to prevent a forward displacement of a hip portion and to give a seated person a sense of stability. It is said that the part is preferably set lower than the thigh.

However, in a driver's seat, a clutch, a brake, an accelerator, and the like are operated by depressing a pedal, so that a foot is often extended forward and downward. In particular, in a truck or the like, the height difference between a seat cushion and a pedal is large and the stroke (depression amount) of a clutch pedal is large as compared with a passenger car, so that the foot must be extended further downward. Therefore, when the clutch pedal is depressed, the seat pad of the seat cushion is greatly compressed, and the front end of the seat cushion frame may press the thigh of the seated person. The compression of the occupant substantially gives the occupant discomfort and discomfort, so that comfort and riding comfort are impaired.

Here, for example, a configuration is conceivable in which the front end portion of the seat cushion frame is formed by bending in advance downward to suppress compression of the thigh when the clutch pedal is depressed. However, in such a configuration, the support force of the thigh of the seated person due to the front end of the seat cushion during normal seating is reduced, and there is a possibility that the buttocks may be shifted forward. It is not preferable because it gives anxiety to people.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a seat cushion frame structure that supports a thigh of a seated person with sufficient supporting force and suppresses pressure on the thigh when a pedal is depressed.

[Means for solving the problem]

In order to achieve this object, according to the present invention, the front end of the frame main body is bent downward, and the support frame is swingably attached via a link above the front end of the frame main body. ing. Also, the support frame is supported by the re-extended support pins of the frame main body in front of the link, and is held at the support position under the biasing force of the biasing means.

[Action]

According to such a configuration, the support frame is held at the support position under the biasing force of the biasing means, and swings downward about the support pin as a fulcrum by a pressing force from above that opposes the biasing force. It is retreated while moving.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, in a seat cushion frame structure 10 according to the present invention, a seat cushion frame 12 is formed by bending a front end 14a of a frame main body 14 downward and forming a separate support. Frame 16
It is swingably attached to the frame body.

The frame body 14 is formed, for example, of a pipe bent into a substantially U-shape, and both ends are connected with a connecting frame 18 to reinforce and form the seat cushion frame 12 serving as a base of the seat cushion 20. Have been.

The seat cushion frame 12 has, for example, a seat spring 22 inside. The seat spring 22 is formed of, for example, an S-spring 24 erected and stretched at equal intervals inside the seat cushion frame 12, and a terminal of the S-spring is, for example, a spring retainer 26 fixed to the seat cushion frame. Is locked and held.

Then, as shown in FIG. 2, a seat pad 28 pre-formed from an elastic body such as urethane foam material is placed on the seat spring 22 in a shape corresponding to the use of the seat, and the seat pad, the seat cushion frame The seat cushion 20 is formed by covering 12 with a trim cover 30 made of a skin or the like. In addition, the terminal of the trim cover 30 is locked to a trimming wire 32 provided between both sides of the frame body 14, for example, as shown in FIG.

Here, according to the present invention, as shown in FIGS. 1 and 2, the front end 14a of the frame main body is bent downward, and the separate support frame 16 swings with respect to the frame main body. Mounted as possible.

The support frame 16, for example, is bent and formed from a pipe or the like into a substantially U-shape having a width capable of holding the front end 14a of the frame main body, for example, through a pair of links 34,
It is attached to the frame main body 14 so as to be vertically swingable.

One end of the link 34 is connected to the bracket 36 of the frame body 14.
For example, it is pivotally connected by a pivot pin 38. Then, both terminals of the support frame 16 are
Is pivotally connected to, for example, a pivot pin 40. As the pivot pins 38 and 40, for example, stepped rivets that can easily secure the rotation of the link 34 with respect to the bracket 36 and the rotation of the support frame 16 with respect to the link can be used.

As shown in FIGS. 1 and 2, a support pin 42 that supports the support frame 16 and regulates the swing of the support frame downward extends, for example, to the left and right sides of the frame body 14. Is provided. The support pin 42 is configured to support an intermediate portion on the side of the support frame 16 in front of the link 34.

For example, as shown in FIG. 2, a stopper 44 for regulating the rotation of the link 34 clockwise about the pivot pin 38.
Is provided on the bracket 36, and the support position of the support frame 16 is set when the link is locked by the stopper. Here, for example, a biasing means 46 for holding and returning the support frame 16 to the support position under a biasing force is provided.

As the biasing means 46, for example, a torsion spring wound around a pivot pin 38 can be used, and one end of the torsion spring is locked to the extension end 34a of the link 34 formed in a bell link shape, and Are locked to the side of the frame body 14 or the like. In such a configuration, the torsion spring
46 biases the link 34 clockwise in FIG.

For example, as shown in FIG. 2, in a normal sitting state, that is, when the clutch pedal 48 or the like is not operated, the load W1 of the occupant concentrates near the hip point. For this reason, a load and a pressing force that overcome the biasing force of the torsion spring 46 and cause the rotation of the support frame 16 do not act on the front end of the seat cushion 20, and the support frame is held at the support position.

Then, for example, when the clutch pedal 48 is depressed, in addition to the load w1 of the buttocks, a pressing force W2 of the thigh against the biasing force of the torsion spring 46 acts on the front end of the seat cushion 20, The support frame 16 is pushed in by the pushing force W2. At this time, as shown in FIG. 2, the support frame 16 tends to lift the rear end upward by the principle of leverage with the support pin 42 as a fulcrum. Then, the third
As can be seen from the figure, as the rear end of the support frame 16 is lifted, the link 34 rotates counterclockwise around the pivot pin 38, and the rotational force of the link pulls the support frame backward. The force acting on the support frame. That is, the support frame 16 retreats while swinging downward by the action of the pressing force W2, and is released from the thigh.

For example, when the depression of the latch pedal 48 is released from the state shown in FIG. 3 and the foot is returned to the normal sitting state, the link 34 is released under the biasing force of the torsion spring 46.
Is rotated clockwise about the pivot pin 38.
Then, as the link 34 rotates, the support frame 16
With the lower end of the rear end, the front end of the support frame is raised with the support pin 42 as a fulcrum, and the support frame is returned to the support position.

According to the above configuration, even if the front end of the seat cushion 20 is pressed by the thigh by stepping on the clutch pedal or the like, the support frame 16 at the front end of the seat cushion frame is lowered by the pressing force W2 by the thigh. Retreat while rocking. That is, even if the seat pad 28 is compressed by the pressing force W2 from the thigh of the seated person, the support frame
16 escapes downward with the action of the pressing force W2, so that compression of the thigh can be sufficiently suppressed. Therefore, the clutch pedal
Even in a seat such as a truck having a large stroke (depressed amount) such as 48, the compression of the thigh can be sufficiently suppressed, and the comfort is sufficiently ensured.

Further, since the compression of the thigh by the seat cushion frame 12 can be suppressed, the seat cushion 20 can be set to be inclined rearward. Therefore, the sense of stability of the occupant is increased, and the forward displacement of the buttocks can be reliably prevented, so that the comfort of the occupant is further ensured.

In a normal sitting state, the support frame
Since 16 is in the support position, the thigh of the seated person is supported by the support frame. For this reason, even in a normal sitting state, the forward displacement of the buttocks can be prevented, and the occupant does not feel uneasy.

Further, the seat pad 28 at the front end of the seat cushion is securely supported by the support plate 16, so that the shape of the seat pad does not change due to the sagging of the seat pad, and the appearance quality is not deteriorated.

In the embodiment, the seat cushion frame 12 is embodied as a pipe frame having the seat spring 22 inside, but is not limited thereto, and may be, for example, a pan frame.

Further, the seat cushion frame 12 is not limited to the illustrated shape having the substantially U-shaped frame body 14, and may be, for example, a four-divided frame that connects the front and rear sides of the side bracket of the seat slide device with a connection frame or the like.

Note that the seat cushion frame structure 10 of the present invention is used.
Although is suitable for truck seats, it is not limited thereto, and may be applied to, for example, seats of general passenger cars and buses, and seats of construction machinery and the like.

The embodiments described above are for explaining the present invention, and do not limit the present invention in any way. All modifications and alterations within the technical scope of the present invention are included in the present invention. Needless to say.

〔The invention's effect〕

As described above, according to the seat cushion frame structure of the present invention, the support frame is retracted while swinging downward at the front end of the frame main body by the pressing force from the thigh. In other words, by the pressing force of the thigh,
Since the support frame escapes backward and downward, compression of the thigh can be suppressed. Therefore, the comfort of the occupant is sufficiently ensured even in a seat such as a truck.

Even if the seat cushion is set to be inclined rearward, the compression of the thigh can be sufficiently suppressed by the swing and retreat of the support frame. As a result, the seated person's sense of stability is increased, and the forward displacement of the buttocks can be reliably prevented.
Comfort of the seated person is further ensured.

In a normal sitting state, the support frame is at the support position, so the thigh of the seated person is supported by the support frame. For this reason, even in a normal sitting state, the forward displacement of the buttocks can be prevented, and the occupant does not feel uneasy.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a seat cushion frame structure according to the present invention, and FIGS. 2 and 3 are schematic side views of a part of the seat cushion when the seat is normally seated and the pedal is depressed. 10: Seat cushion frame structure, 12: Seat cushion frame, 14: Frame body, 14a: Frame body front end, 16: Support frame, 34: Link, 42: Support pin, 4
6: biasing means (torsion spring), 48: clutch pedal.

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A47C 7/14 B60N 2/00

Claims (1)

(57) [Claims] The front end of the frame body is bent downward and formed, a support frame is swingably mounted above the front end of the frame body via a link, and the biasing force of the biasing means is also reduced. A support pin, which is held at the support position and supports the support frame, is provided so as to extend to the side of the frame body in front of the link, and the pressing force from the thigh of the seated person makes the support pin a fulcrum. A seat cushion frame structure that retreats while swinging downward.