JP4072042B2 - Interlock device for vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlock device for a vehicle seat that can automatically perform an automatic operation of a seat, for example, a forward sliding operation of a seat and a jumping operation of a seat cushion. .
[Prior art]
[0003]
Conventionally, in a vehicle seat, the automation of the operation from the viewpoint of achieving simplification of the seat operation is being promoted, for example, as a type of so-called "walk-in mechanism", drive-up the forward movement and the seat cushion of the seat Both the movements are electrically operated, and when a forward movement of the seat is performed by a switch operation, a raising operation of the seat cushion is performed in conjunction with the forward movement of the seat. This is intended to enlarge the cargo space at the rear of the passenger compartment as much as possible by moving the seat to the front as much as possible.
[0004]
By the way, in this case, for example, when a person is seated on the seat, the operator erroneously performs a switch operation, and in response thereto, the forward movement of the seat and the raising operation of the seat cushion are automatically executed. There is also a concern that the safety of the person sitting on the seat is affected. For this reason, in a vehicle seat, it is widely performed to include an interlock device that prevents an operation such as movement of the seat when a person is seated on the seat.
[0005]
Here, the problem is a means for detecting that a person is seated on the seat, and as one of them, as shown in Patent Document 1, it is caused by the seating of a person near the seat cushion seat surface. Install the pressure sensitive switch for outputting a predetermined signal by sensing the pressure from above, the seating signal from the pressure sensitive switch, to transmit to the relay switch provided in the power supply circuit of the sheet forward drive motor via a relay, There is one in which the power supply circuit is opened to prohibit the forward movement of the seat.
[0006]
[Patent Document 1]
.
[0007]
Japanese Utility Model Laid-Open No. 55-68632 (claims of utility model, FIGS. 3 and 4).
[Problems to be solved by the invention]
[0008]
However, in the conventional interlock device shown in the above-mentioned Patent Document 1, it is necessary to provide a relatively expensive pressure-sensitive switch and a relay, and when the pressure-sensitive switch is attached to the seat cushion, It is necessary to set the mounting position accurately so that the person sitting on the seat cushion can be reliably detected by the pressure switch, which requires a lot of man-hours for assembly work. As a result, the interlock device is expensive. As a result, there is a problem in that the cost of the seat device itself provided with the interlock device is increased.
[0009]
Therefore, the present invention has been made with the object of providing an interlock device for a vehicle seat having a simple and inexpensive configuration.
[Means for Solving the Problems]
[0010]
In the present invention, the following configuration is adopted as a specific means for solving such a problem.
[0011]
(1) In the vehicle seat interlock device according to the first invention of the present application, the position or / and the posture of the seat 1 can be changed by the driving means 7 and 8 that are started and stopped by the operation of the operation switch 11. In a vehicle seat, seating detection means 23 for detecting a seating of a person on the seat cushion 2 based on the magnitude of the downward deflection displacement of the seat cushion 2, which is substantially U-shaped or crank-shaped When bent, it can be elastically deformed in the direction of contact with and away from the lower surface of the seat cushion 2 and the downward bending displacement is not more than a predetermined value, the first posture is maintained by the elastic force, while the bending When the displacement amount exceeds a predetermined amount, the seat cushion 2 receives a displacement force and is elastically deformed downward from the first posture to be set in the second posture. A detecting means 23, a operation inhibition means 10 receives the seating detection by said seating detecting means 23 prohibits the operation of the drive means 7 and 8, the when the spring member 23 is set to the second position It is characterized by comprising an operation prohibiting means 10 composed of an opening / closing switch 10 for receiving a displacement force and shutting off the power supply circuit 14 to the driving means 7, 8 .
[0012]
Therefore, according to the vehicle seat interlock device of the present invention, the seating detecting means 23 detects the seating based on the amount of deformation of the seat cushion 2 caused by the seating of the person. A configuration that mechanically detects the displacement is sufficient, as compared with a configuration that electrically detects the load applied to the seat cushion (that is, the pressure due to the weight of the seated person) using a pressure-sensitive switch as in the past. Thus, the structure is simple and inexpensive, and the attachment position of the seating detection means 23 to the seat cushion 2 can be set relatively rough, so that the assembling property is improved.
[0013]
Further, since the seating detection means 23 is composed of the spring body 23 whose displacement changes in response to the flexural displacement of the seat cushion 2, the seats differ depending on whether or not a person is seated on the seat cushion 2. The amount of deflection displacement of the cushion 2 is mechanically detected by the spring body 23, and the reliability of the detection information is improved. Further, since the operation prohibiting means 10 is constituted by the open / close switch 10 which operates upon receiving the displacement of the spring body 23 and shuts off the power supply circuit 14 to the driving means 7 and 8, a relay or the like as in the prior art. Compared with a relay switch, simplification of the structure and cost reduction are further promoted.
[0014]
(2) According to a second invention of the present application, in the vehicle seat interlock device according to the first invention, the spring body 23 has the first posture and the second posture by bending deformation or torsional deformation. It is characterized in that the posture is set between them.
[0015]
Therefore, according to the vehicle seat interlock device of the present invention, the length of the spring body 23 can be set relatively long. When the spring body 23 is assembled to the seat cushion 2, the spring body 23 is Even if the mounting position is slightly deviated, the displacement of the seat cushion 2 can be reliably received and the required displacement can be realized, and the assembling workability is also greatly improved. As a result, as described in the above (1) The effect of will be further promoted.
【The invention's effect】
[0016]
As described above, according to the vehicle seat interlock device according to the present invention, the detection of the seating of a person on the seat cushion 2 and the prohibition of the operation of the driving means 7 and 8 based on this detection can be performed easily and This can be reliably realized with an inexpensive configuration, and as a result, a vehicle seat provided with an interlock device with high safety in use of the seat can be provided at a lower cost.
DETAILED DESCRIPTION OF THE INVENTION
[0017]
Hereinafter, the present invention will be specifically described based on preferred embodiments.
[0018]
(A) 1st Embodiment In FIG.1 and FIG.2, the seat cushion 2 part of the vehicle seat 1 provided with the interlock apparatus which concerns on 1st Embodiment of this invention is shown.
[0019]
The seat cushion 2 includes an underframe 21 and a cushion pad 22 described below.
[0020]
The under frame 21 is obtained by press-molding a thin steel plate into a dish shape having a rectangular planar shape, and a pair of left and right bottom walls 21c extending from the front end portion 21a to the rear end portion 21b. Side walls 21d and 21d are provided. The bottom wall 21c includes a front end inclined surface 21c1 that gradually descends from the front end 21a toward the rear end 21b, and a rear inclined surface that gradually descends from the rear end 21b toward the front end 21a. 21c3 and an intermediate recess 21c2 which is between the front inclined surface 21c1 and the rear inclined surface 21c3 and is greatly recessed. Then, the cushion pad 22 described below is attached to the recessed portion surrounded by the bottom wall 21c and the pair of left and right side walls 21d and 21d with the lower portion fitted.
[0021]
Further, the spring body 23 and the opening / closing switch 10 described below are attached to the under frame 21 on the bottom wall 21c side.
[0022]
The spring member 23, using a spring wire of a predetermined diameter, which is intended to give al is by bending as in dual mode to form a space portion of the substantially U-shaped on its inner side, as a whole, plane It is made into the form bent to the arc side to the one side of the direction. The spring body 23 has a posture in which the concave side of the warp is directed upward, and a pair of support ends 23c and 23c located at both ends thereof are cut off part of the front end inclined surface 21c1 of the underframe 21. It is pivotally supported by a pair of left and right pivot brackets 24, 24 that are raised and wound into a cylindrical shape. Further, an operating member 25 having a U-shaped cross section is attached to the side of the horizontal portion 23b of the spring body 23 with the legs directed downward.
[0023]
In the state where the pair of left and right fulcrum portions 23d and 23d are pivotally supported by the pivot brackets 24 and 24, the spring body 23 has a bottom of the underframe 21 of the pair of left and right arm portions 23a and 23a. The range corresponding to the front end inclined surface 21c1 of the wall 21c is substantially in contact with the front end inclined surface 21c1, but is a portion extending away from the front end inclined surface 21c1 and extending toward the intermediate recess 21c2, that is, between the front end inclined surface 21c1 and the middle. The portions located closer to the horizontal portion 23b than the fulcrum portions 23d and 23d corresponding to the boundary portion of the recess 21c2 are in a state of being levitated and separated from the bottom wall 21c.
[0024]
Therefore, in the free state where no load is applied from above, the spring body 23 has portions closer to the support ends 23c and 23c than the fulcrum portions 23d and 23d from the lower side to the front end inclined surface 21c1 of the bottom wall 21c. The posture that is supported and floated and separated from the bottom wall 21c is maintained (the posture of the spring body 23 at this time is the “first posture” in the claims).
[0025]
On the other hand, when a load is applied to the spring body 23 in the “first posture” from above, the spring body 23 is laterally moved from the fulcrum parts 23d and 23d. The portion extending over the bridge portion 23b is elastically deformed (bend deformation) downward under the load. The maximum downward deformation amount of the spring body 23 is regulated by the leg portion of the working member 25 coming into contact with the bottom wall 21 c of the under frame 21.
[0026]
On the other hand, a mounting bracket 26 is provided by cutting and raising a part of the bottom wall 21c at the intermediate recess 21c2 of the bottom wall 21c and corresponding to the operating member 25 on the spring body 23 side. The open / close switch 10 is attached to the mounting bracket 26. This open / close switch 10 is a limit switch provided in the middle of a power supply circuit 14 (see FIG. 3) of the slide drive means 7 and the jump drive means 8 described later, and is oscillated and displaced in the vertical direction on the upper surface side thereof. An operating element 10a is provided. The opening / closing switch 10 is activated when the operating element 10a is pushed downward by a predetermined amount or more, and operates to open the power supply circuit 14 and prevent power supply to the driving means 7 and 8.
[0027]
The operating element 10a of the open / close switch 10 corresponds to the operating member 25 on the spring body 23 side in the vertical direction, and the operating state is set by the operating member 25 that moves downward by deformation of the spring body 23 downward. It is what is done. The deformation amount of the spring body 23 is such that the deformation amount when the opening / closing switch 10 is activated by the operating member 25 and the leg portion of the operating member 25 abut against the bottom wall 21c of the under frame 21. The posture of the spring body 23 when it is within the range of the deformation amount when further downward movement is restricted is the “second posture” in the claims.
[0028]
On the other hand, the cushion pad 22 is integrally formed by, for example, foam molding using a foamed resin material, and the lower surface thereof has an upper central portion excluding the front and rear end portions and the left and right end portions. The concave portion 22a is depressed by a predetermined depth. Then, the cushion pad 22 is fitted and arranged in the under frame 21 with the lower surface thereof facing downward (state of FIG. 2). Furthermore, the underframe 21 and the cushion pad 22 are integrated by covering the surface side of the cushion pad 22 with a skin (not shown) and fixing the edge of the skin to the underframe 21 side, The seat cushion 2 is configured.
[0029]
When the cushion pad 22 is fitted and fixed in the underframe 21 as described above, the spring body 23 and the open / close switch 10 are placed in the recess 22a on the bottom surface side of the cushion pad 22 as shown in FIG. positioned. When the cushion pad 22 is in a free state (ie, a person is not seated on the seat cushion 2), the bottom surface of the recess 22a of the cushion pad 22 and the operating member 25 on the spring body 23 side are It is in a non-contact state and this relationship is maintained. On the other hand, when a person sits on the seat cushion 2 and receives the weight, the cushion pad 22 bends and deforms downward, and the bottom surface of the recess 22a comes into contact with the operating member 25. 23 receives the bending deformation force of the cushion pad 22 and is elastically deformed downward, and is located within the range of the second posture, so that the operating member 25 abuts against the operating element 10a of the opening / closing switch 10. This is the operating state.
[0030]
Thus, the spring body 23 detects whether or not a person is seated on the seat cushion 2 based on the amount of deformation of the cushion pad 22. The open / close switch 10 is activated by receiving the displacement of the spring body 23 to open the power supply circuit 14 and prevent power supply to the drive means 7 and 8. The spring body 23 and the opening / closing switch 10 constitute an interlock device. The actual operation of this interlock device will be described below.
[0031]
As shown in FIGS. 5 and 6, the seat cushion 2 constitutes the seat 1 together with the seat back 3 by attaching the seat back 3 to the rear end portion thereof. In this embodiment, the seat cushion 2 can be flipped upward from the front end side (see FIG. 6). In order to realize the raising operation of the seat cushion 2, the seat cushion 2 is provided with a raising drive means 8.
[0032]
Further, the seat 1 is fixed on a slide rail 5 disposed in the vehicle length direction via a seat support bracket 6, and can be moved in the front-rear direction as the slide rail 5 slides. (See FIG. 6). In order to realize the back-and-forth movement of the seat 1, a slide driving means 7 is attached to the slide rail 5.
[0033]
As shown in FIG. 3, the motor 12 of the slide drive means 7 and the motor 13 of the jump drive means 8 are connected in parallel to a battery 15 via a power circuit 14. In the middle of the power supply circuit 14, the open / close switch 10 and the operation switch 11 are arranged in series. Accordingly, when the operation switch 11 is turned ON, if the opening / closing switch 10 is closed (that is, if the opening / closing switch 10 is in an inoperative state), the motors are operated as the operation switch 11 is operated. Power is supplied to 12 and 13, respectively, and the slide drive means 7 and the jump drive means 8 are operated together, and are automatically executed in conjunction with the forward movement of the seat 1 and the raising of the seat cushion 2. become.
[0034]
On the other hand, when the operation switch 11 is turned on, if the opening / closing switch 10 is open (that is, if a person is seated on the seat cushion 2 and the opening / closing switch 10 is in an activated state), Regardless of the operation of the operation switch 11, power supply to the motors 12 and 13 is stopped, both the slide drive means 7 and the jump drive means 8 are deactivated, the forward movement of the seat 1 and the above Bounce-up of the seat cushion 2 is prohibited.
[0035]
The operation state of the seat 1 when the person is seated on the seat cushion 2 and when the person is not seated will be described in more detail with reference to FIGS. 5 and 6.
[0036]
FIG. 5 shows a state in which a person is seated on the seat cushion 2. Accordingly, the spring body 23 is elastically deformed from the first posture to change the posture to the second posture, and the opening / closing switch 10 is actuated. It is in a state. Therefore, in this state, even if a person operates the operation switch 11, the seat 1 maintains its position without performing forward movement and the seat cushion 2 jumping operation. That is, the interlock device is in an operating state when a person is seated on the seat cushion 2.
[0037]
On the other hand, as shown in FIG. 6 (a), when no person is seated on the seat cushion 2, the spring body 23 maintains the first posture, and the opening / closing switch 10 is inoperative. It is in a state. Therefore, in this state, when a person operates the operation switch 11, power is supplied to the motor 12 of the slide drive means 7 and the motor 13 of the jump drive means 8, and the seat 1 is supplied to the drive means 7, 8 respectively. Thus, as shown in FIGS. 6 (b) and 6 (c), the seat cushion 2 is moved forward while jumping up, and stopped at the position shown in FIG. 6 (c). That is, in a state where no person is seated on the seat cushion 2, the safety of the person is not impaired, so that the seat 1 is moved forward to the foremost position in response to the operation of the operation switch 11. The seat cushion 2 is also maximally lifted, and the maximum cargo space is secured on the rear side of the seat 1.
[0038]
FIG. 3 shows a circuit configuration when the seat 1 is moved forward as an example of a power supply circuit for the drive system of the seat 1. The circuit diagram when the seat 1 is moved backward is shown in FIG. Omitted.
[0039]
(B) Second Embodiment FIG. 4 shows a seat cushion 2 portion of a vehicle seat 1 provided with an interlock device according to a second embodiment of the present invention.
[0040]
The seat 1 of this embodiment has the same basic structure as the seat 1 of the first embodiment, and the difference is the structure of the underframe 21 and the spring body 23. Therefore, here, only the structure of the underframe 21 and the spring body 23 will be described in detail, and the description of other structures will be omitted by using the corresponding description in the first embodiment.
[0041]
The under frame 21 is formed of a rectangular frame having a predetermined height, and two front and rear S springs 30 and 30 are horizontally disposed therein and supported by the S springs 30 and 30. In such a state, the cushion pad 22 is attached to the under frame 21 from above, whereby the seat cushion 2 is configured. In this case, in this embodiment, the two S springs 30, 30 are arranged near the front part and the rear part of the under frame 21, respectively, and between the S springs 30, 30, that is, the under frame 21. The substantially central portion in the front-rear direction is an empty portion where the S spring 30 is not provided. This configuration is because the spring body 23 described below performs the same function as the S spring 30 in this empty portion as will be described later. Is.
[0042]
At the positions near the left and right ends of the rear wall surface 21a of the under frame 21, pivot brackets 24, 24 are formed by winding a part of the wall surface in a cylindrical shape. The spring body 23 is pivotally supported. A fixing bracket 27 is formed at the rear end of one side surface 21b of the under frame 21 by winding a part of the side surface 21b into a cylindrical shape. Further, an open / close switch 10 having an actuator 10a is fixed to a rear end portion of the other side surface 21c of the under frame 21.
[0043]
The spring body 23 is formed as an arm portion 23a by bending a longitudinal intermediate portion of a spring wire having a predetermined diameter into a crank shape. Further, both end portions of the arm portion 23a are further bent into a crank shape to form a pair of left and right support ends 23b and 23b, and end portions of the support ends 23b and 23b. Each of them is extended in a direction perpendicular to this, one of which is a fixing portion 23c and the other is an operating portion 23d.
[0044]
The spring body 23 is supported in the vertical direction around the support ends 23b, 23b by supporting the pair of left and right support ends 23b, 23b on the pivot brackets 24, 24 on the underframe 21 side. The arm portion 23a extends from the lower side of the rear wall 21a of the under frame 21 to the inside of the under frame 21 and moves the arm portion 23a to the second frame. Of the S springs 30, 30 of the book, it passes through the lower side of the S spring 30 located closer to the rear and faces the lower surface of the cushion pad 22 from the empty portion. Further, the spring body 23 fixes and holds the fixing portion 23c to the fixing bracket 27 on the under frame 21 side, while the operating portion 23d rotates around the support end 23b in an unconstrained state. Thus, the operating portion 23d is engaged with the operating element 10a of the opening / closing switch 10.
[0045]
Therefore, the spring body 23 is in a free state below the seat cushion 2 in a state where no load is applied to the arm portion 23a, that is, in a state where no person is seated on the seat cushion 2. The posture is maintained as it is, and the operating portion 23d is disengaged from the operating element 10a of the opening / closing switch 10. Therefore, in this state, when a person operates the operation switch 11, the driving means 7 and 8 are both actuated, and the seat 1 is moved forward while jumping up the seat cushion 2. Stopped at the foremost position.
[0046]
On the other hand, in a state where a load is applied to the arm portion 23a, that is, in a state where a person is seated on the seat cushion 2, the cushion pad 22 of the seat cushion 2 is moved to the S springs 30. , 30 is displaced downward against the elastic support force, and abuts against the arm portion 23a of the spring body 23 to push it down. Then, the spring body 23 rotates about the support ends 23b, 23b against the torsional elastic force, and the operating portion 23d engages with the operating element 10a of the opening / closing switch 10 to operate it. State.
[0047]
As a result, even if the operation switch 11 is operated, power is not supplied to the driving means 7 and 8, and the seat 1 does not move forward and the seat cushion 2 does not move up. Stops (realization of interlock when a person is seated on the seat cushion 2). Therefore, careless movement of the seat 1 and jumping up of the seat cushion 2 while a person is seated on the seat cushion 2 are prohibited, and the safety thereof is ensured.
[0048]
As described above, when a person is seated on the seat cushion 2 and the cushion pad 22 is displaced downward against the elastic force of the 30, 30, the cushion pad 22 is an arm of the spring body 23. In this case, the torsional elastic force of the spring body 23 is applied to the cushion pad 22 in a direction to urge it upward as a reaction force. It works to suppress downward deformation. That is, the spring body 23 performs the same function as the S spring 30. For this reason, in this embodiment, three S springs 30 are appropriately arranged inside the under frame 21 so as to be appropriately separated in the front-rear direction, and the cushion pad 22 is formed by the three S springs 30. where to be elastically supported, among these three S-spring 30, acts to this form because the play is the spring member 23 for S springs 30 positioned in the front-rear direction center, dare provided with the center of the S-springs 30 Therefore, the spring body 23 is replaced by this, whereby the number of the S springs 30 is reduced and the cost is reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a seat cushion portion of a vehicle seat provided with an interlock device according to a first embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is an electric circuit of the interlock device shown in FIG. 1;
FIG. 4 is a perspective view of a seat cushion portion of a vehicle seat provided with the interlock device according to the first embodiment of the present invention.
FIG. 5 is a side view showing a seat operation state in an interlock operation state.
FIG. 6 is a side view showing a seat operation state in an interlock non-operation state.
[Explanation of symbols]
1 is a seat, 2 is a seat cushion, 3 is a seat back, 5 is a slide rail, 6 is a seat support bracket, 7 is a slide drive means, 8 is a jumping drive means, 10 is an open / close switch (operation prohibiting means), 11 Operation switches, 12 and 13 are motors, 14 is a power supply circuit, 15 is a battery, 21 is an under frame, 22 is a cushion pad, 23 is a spring body (sitting detection means), 24 is a pivot bracket, 25 is an operating material, 26 Is a mounting bracket, 27 is a fixed bracket, 30 is an S spring, and X is a seating detection means.

Claims (2)

In the vehicle seat in which the position or / and the posture of the seat (1) can be changed by the driving means (7, 8) activated and stopped by the operation of the operation switch (11).
Seat detection means (23) for detecting the seating of a person on the seat cushion (2) based on the magnitude of the downward deflection displacement of the seat cushion (2), which is substantially U-shaped or crank-shaped. The first posture is maintained by the elastic force when it is bent in the direction and can be elastically deformed in the direction of coming into contact with and separated from the lower surface of the seat cushion (2) and the downward deflection displacement is not more than a predetermined value. When the deflection displacement amount exceeds a predetermined value, the spring body (23) which receives the displacement force of the seat cushion (2) and is elastically deformed downward from the first posture and set to the second posture. Configured seating detection means (23);
An operation prohibiting means (10 ) for receiving the seating detection by the seating detecting means (23) and prohibiting the operation of the drive means (7, 8) , wherein the spring body (23) is set to the second posture. And an operation prohibiting means (10) constituted by an open / close switch (10) for receiving the displacement force and shutting off the power supply circuit (14) to the drive means (7, 8). Seat interlock device. In claim 1 ,
An interlock device for a vehicle seat, wherein the spring body (23) is configured to be set between the first posture and the second posture by bending deformation or torsional deformation.

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