JPH0228103Y2 - - Google Patents

Description

[Detailed description of the invention] This invention expands the cabin space by standing up or inverting the seat of a vehicle such as a passenger car or passenger car, especially the seat cushion, using its front lower part as a fulcrum and tilting the seat back forward. This invention relates to a seat cushion mainly used in rear seats (see, for example, Japanese Utility Model Publication No. 10980/1973).

This type of seat cushion is generally provided with a locking device at the rear of the seat cushion and the body floor to prevent the rear of the seat cushion from jumping up when sudden braking or other impact is applied.

As a locking device for preventing the rear part of the seat cushion from jumping up, a striker is provided on the body floor side, and a locking member that engages and disengages from the striker is provided on the seat cushion (for example,
No. 437 and Publication No. 57-22440). This locking device consists of a striker, a base plate, a locking plate, a locking plate rotating shaft, a locking plate biasing spring, a locking plate operation knob, and many other parts. To wake up, you must operate the above knob to release the lock. That is, the seat cushion is locked even when it does not need to be locked.

In view of the above, some devices are known in which the locking device operates only when an impact is applied. For example, a weight pin is installed in the body floor, which is normally held in a non-engaged position by a spring, and when an impact is applied, the pin flies forward and engages a lock hole in the seat cushion, locking the seat in place. The device that prevents the cushion from jumping up is difficult to set the tension of the spring that pulls the weight pin, and lacks reliability.

In addition, the emergency lock retractor (abbreviated as ELR) used in seat belts is installed at the rear of the seat cushion.
Although the operation is reliable, the structure is complicated and expensive.

The object of the present invention is to provide a seat cushion locking device that is normally in a disengaged state but is reliably locked when an impact is applied, has a simple structure, has a small number of parts, and does not require adjustment. .

That is, as shown in FIG. 1, in a vehicle seat in which the vehicle interior space can be expanded by standing up or inverting the seat cushion 1 using its front lower part as a fulcrum and tilting the seat back 2 forward, the seat cushion A hinge mechanism 4 connecting the front lower part of the seat cushion 1 and the body floor 3 is configured to be deformable at least forwardly by a front impact force applied to the seat cushion 1, and a seat cushion 4 rearward of the hinge mechanism 4 Engaging parts 5 and 6 are provided oppositely on the back surface of the housing and the upper surface of the body floor in the vicinity thereof, and one of the engaging parts 5 is parallel to the body floor 3 and has a hole 51 in the center, and the other engaging part The portion 6 has a hook shape that is large enough to fit loosely into the hole 51 of the mating engaging portion 5, and the engaging portion 6 acts as a hook.
is always located in the hole 51 and does not engage with the edge of the hole 51 when the seat cushion 1 is raised up, but when the seat cushion 1 shifts forward due to an impact, it gets caught on the edge of the hole 51 and the seat cushion 1 The gist is that the structure is configured to prevent the spring 1 from jumping up.

In the figure, 7 is the seat of the seat cushion 1, 8 is the tilting fulcrum shaft of the seat back 2, and 9 and 10 are the inclination angle adjustment mechanisms of the seat back 2.
By releasing the button, the seat bag 2 can be tilted forward.

To explain the structure of the engaging parts 5 and 6 of the embodiment, the engaging part 5 on the seat cushion side is made of a plate piece, and the front half of the engaging part 5 is stacked on the rear end of the bottom surface of the seat cushion 1 and is fastened with a bolt or the like. A rectangular engagement hole 51 is opened in the center of the rear half that is fixed and protrudes rearward. The engaging portion 6 on the body floor side is made of plate material L
The upper end 61 of the vertical side is bent backward into a hook shape to form a hook, and the bottom side 62 is overlapped with the floor 3 and fixed with bolts 11. The hook 61 is sized to fit loosely into the square hole 51.

The rear end of the seat cushion 1 is pressed against the body floor 3 by being pushed under the seat back 2 against its elasticity.

When the rear part of the seat cushion 1 is picked up, its engaging part 5 passes through the engaging part 6 on the floor side, and the seat cushion 1 moves around the shaft 41 of the hinge 4 as shown by chain lines 1A to 1B in FIG. Stand up centered.

When a sudden brake is applied, a forward force due to inertia is applied to the seat cushion 1, causing the hinge 4 to move to the third position.
The seat cushion 1 is deformed as shown in FIG. 4A, or its hinge attachment part is pulled, and the seat cushion 1 moves forward as shown by the solid line 1C, and at that position, the rear part of the cushion bounces around the shaft 41. Trying to go up.

However, as the seat cushion 1 moves forward due to the impact, the edge of the rectangular hole 5 comes into contact with the mating part 6, so the edge of the rectangular hole 5 becomes attached to the hook 61.
This prevents the seat cushion 1 from jumping up.

As mentioned above, the locking device for the foldable seat cushion of the present invention prevents the initial deformation that occurs in the hinge mechanism 4, which is the attachment point of the seat cushion 1 to the body floor 3, when an impact such as sudden braking is applied. When the seat cushion 1 is raised forward to expand the vehicle interior space, the engaging portions 5 and 6 can be engaged with each other. , simply pick up the seat cushion.

When an impact is applied, the engaging portions 5 and 6 are locked due to the movement of the seat cushion itself, which always occurs as described above, which is reliable and has a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a side view of a seat equipped with the locking device of the present invention, FIG. 2 is an enlarged perspective view of an engaging portion, and FIG. 3 is a side view of the seat cushion in a state in which it is shifted forward. 1 is seat cushion, 2 is seat back, 3
is the body floor, 4 is the hinge, 41 is the fulcrum shaft,
5 and 6 are engaging parts.

Claims (1)

[Scope of utility model registration request] In a vehicle seat in which the passenger compartment space can be expanded by standing up or inverting the seat cushion using its front lower part as a fulcrum and folding the seat back forward, the front lower part of the seat cushion is connected to the body floor. The hinge mechanism is configured to be deformable at least forwardly by a frontal impact force applied to the seat cushion, and an engaging portion is provided on the back surface of the seat cushion behind the hinge mechanism and the upper surface of the body floor in the vicinity thereof. One of the engaging parts is parallel to the body floor and has a hole in the center, and the other engaging part has a hook shape that is sized to fit loosely into the hole of the other engaging part. , the engaging part that acts as a hook is always located in the hole and does not engage with the edge of the hole when the seat cushion is raised, but when the seat cushion shifts forward due to an impact, it engages with the edge of the hole. A locking device for a folding seat cushion in a vehicle seat, which is configured to prevent the seat cushion from flipping up when caught.