JP5171297B2 - Sheet device - Google Patents

Description

  The present invention relates to a seat device that is mainly used as a rear seat of a vehicle or the like, and in particular, the inclination angle of a seat back that is tilted forward from a position away from the seat such as the vicinity of a driver seat can be returned to a standing position. The present invention also relates to a seat device that can prevent an excessive load from being applied to a power motor even when the seat back sandwiches a load or the like.

  Conventionally, one-box type vehicles represented by “minivans” and the like are equipped with two or three rows of seats in the room. In such a vehicle, it is necessary to realize a wide variety of seat arrangements according to the use purpose and application of the occupant. As a typical example, the second row seat and the third row seat are greatly moved in the front-rear direction to enlarge the cargo space, or the second row seat and the third row seat And the backs of the second row sheets or the third row sheets are tilted forward (tilted forward), and the back surface of the second row sheets is used as a table.

  As described above, the seat back is tilted forward (entirely tilted) and folded, and the back side is used as a table or the rear side of the vehicle body is used as a luggage compartment, and then the seat can be seated again. For example, the occupant is forced to perform an operation such as opening the door on the side of the vehicle body and manually raising the seat back. Such work is very troublesome because it requires time and labor. Accordingly, it is preferable to provide such a seat with a “seat back raising mechanism” that can raise the seat back by operating a switch at a location away from the seat.

As the “seat back raising mechanism”, for example, the technique described in Patent Document 1 has been conventionally known. With the technique described in such a document, a reclining device is provided on one side of the seat back, and a free hinge (3) is provided on the other side, and a wire (16) is coupled to the free hinge (3), The seat back can be caused by winding the wire (16) with a device formed by the sector gear (7), the reduction gear (6), the electric device (5), and the one-way clutch bearing (10). According to such technology, if a switch for operating the device is installed in a remote place such as a driver's seat and the switch is operated from there, not only can the seat back be caused from a remote place in the vehicle, Since it is only necessary to attach the free hinge and the device to the seat, it is easy to assemble and it can be said that this is an effective technology.
JP 2001-239862 A

  However, the seat device of Patent Document 1 tilts the seat back forward by manually operating a reclining device attached to one side of the seat back to tilt the seat back forward and widen the cargo space. The seat back is returned to the original position by connecting a wire to a free hinge attached to the side and pulling it by an electric device and a sector gear. For this reason, since there is a relatively long distance from the electric device that pulls the wire to the free hinge, play occurs between the one-way clutch and the wire during operation, and the operation may become unstable depending on the use situation. The problem was.

  Further, in the seat device of Patent Document 1, when the seat back raising mechanism is operated in a state where an occupant or a baggage is present on the back surface of the seat back, the seat back and the vehicle wall surface are arranged. In addition to sandwiching passengers and luggage in the vehicle, an excessive load is applied to the motor, the wire, and the like, causing the seat back to be damaged. In order to avoid such a situation, it is necessary to provide a detection mechanism that stops the operation of the motor when an excessive load is applied to the motor. However, when such a detection mechanism is provided, the structure of the seat device itself is inevitably complicated and increased in size, which causes problems such as an increase in product unit price, an increased risk of failure, or an increase in the weight of the device. Had.

  The present invention has been made in order to solve the above-described problems, and without using a large-sized device, the inclination angle of the seat back in the forward tilt state from a place away from the seat such as the vicinity of the driver's seat is raised. It is possible to return to the state, and it is possible to prevent a large load from being applied to passengers and luggage that exist between the seat back and the vehicle wall surface, and an excessive load from being applied to the power motor. An object of the present invention is to provide an inexpensive and highly durable sheet device.

In order to solve the above-mentioned problems, the means taken by the present invention are as follows.
First, the invention according to claim 1 is a reclining that restricts and releases tilting of a seat cushion with respect to the seat cushion, a seat back that is tiltably attached to the seat cushion, and a seat back that is tiltable with respect to the seat cushion. A seat device having a device and a return mechanism that returns the tilt angle of the seat back in a forward-tilted state to a standing position in which the occupant can be seated, wherein the return mechanism is activated by an operation of the occupant A power motor, a gear driven by the power motor, a hooking portion that rotates coaxially with the gear, and one end portion and the other end portion, and the one end portion is hooked on the hooking portion. an elastic member which rotates the gear and coaxially attached to the seat back, and to the other end and engaging of the elastic member, the tooth by the power motor And when the elastic member is coaxially rotated, it rotates by being pressed by the other end side of the elastic member, and have a seat back side bracket for returning the tilt angle of the seat back, the seat back If a load is applied to the back of the seat back when returning, the elastic member will be elastically deformed between the hooking part and the seat back side bracket, so that the elastic member will force the load on the seat back side bracket. Without rotating the gears .

  Next, according to a second aspect of the present invention, in the seat device according to the first aspect, the elastic member is a spiral spring, and the end portion on the inner diameter side of the spiral spring is latched to the engagement portion of the gear. The end portion on the outer diameter side of the spiral spring is disposed so as to be engageable with the seat back side bracket.

  According to a third aspect of the present invention, the seat device according to the first or second aspect further includes a control circuit for electrically controlling the return mechanism, and the control circuit can be operated by a passenger. It is installed on the inner wall of the vehicle and is arranged so that it can come into contact with an operation switch that activates the output shaft of the power motor in the forward rotation direction and an operation lever that controls and releases the reclining device. A first reversing switch that reversely rotates the output shaft of the power motor when the reclining device shifts to a restricted state while rotating the output shaft of the power motor in a released state, and a gear that follows the power motor When the phase of the gear returns to the standby state before starting the return mechanism, the rotation of the output shaft of the power motor is stopped. That is characterized in that it has a stop switch.

  Furthermore, in the invention according to claim 4, the seat device according to claim 1 or 2 further includes a control circuit for electrically controlling the return mechanism, and the control circuit can be operated by an occupant. An operation switch that is installed on the inner wall of the vehicle and activates the output shaft of the power motor in the forward rotation direction, and is arranged so as to be able to abut against the gear. The output shaft of the power motor is rotated after the output shaft of the power motor rotates in a forward direction until reaching a recoverable phase, while the gear reaches a phase in which the inclination angle of the seat back side bracket can be recovered to a standing position. And a second reversing switch for reversing the motor, and a protrusion provided on the gear driven by the power motor so that the phase of the gear returns to the standby state before starting the return mechanism. Mo , A stop switch for stopping the rotation of the output shaft of the is characterized in that it has a.

  According to a fifth aspect of the present invention, in the seat device according to the fourth aspect, between the stop switch and the second reverse switch, a coil that is excited by energization and a switch that is energized when the coil is in an excited state. The coil and the switch are arranged in series, the anode is connected to one end thereof, and the stop switch is connected to the other end, and the coil and the switch are connected to each other. A second reversing switch is connected in between, and when the second reversing switch is energized between the coil and the switch, the stop switch is energized regardless of the energizing state of the second reversing switch thereafter. Until the switch is disconnected, the energization state of the switch accompanying the excitation of the coil is continued.

  According to a sixth aspect of the present invention, in the seat device according to any one of the first to fifth aspects, the power motor is a two-pole DC motor, and both electrodes are respectively connected to relays (RY2, RY3). Both relays (RY2, RY3) are connected to the cathode when the return mechanism is inactive, while one relay (RY2) is connected to the anode when the operation switch is energized The other relay (RY3) is connected to the anode when the first reverse switch or the second reverse switch is energized.

  In the seat device according to the first aspect of the present invention, the power of the power motor is transmitted to the seat back side bracket via the elastic member. When the return mechanism is operated with passengers, luggage, etc. on the back of the seat back, the elastic member cannot force the seat back side bracket carrying the load despite the forced rotation of the gear by the power motor. Do not try to press. In other words, the elastic member is elastically deformed between the seat back side bracket and the gear engaging portion, so that the gear is effectively idled, and it is also large for an occupant or luggage that is present between the seat back and the vehicle wall surface. It is possible to prevent the load from being applied, and furthermore, since excessive reaction from the seat back side bracket (according to power transmission) does not reach the power motor side, it is possible to avoid input of excessive load to the power motor. It becomes. Therefore, according to the invention according to the claims, in addition to being able to return the tilt angle of the seat back in the forward tilted state from a position away from the seat such as the vicinity of the driver's seat to the standing state, it is simple and inexpensive. With such a structure, it is possible to prevent an excessive load from being applied to the occupant and the luggage present on the back of the seat back, and it is also possible to prevent an excessive load from being applied to the power motor in the return mechanism.

  Next, since the seat device of the invention according to claim 2 employs the “spiral spring” as the elastic member, when an “excessive load” is generated, the power motor is within the range of elasticity depending on various dimensions of the spiral spring. The rotation of the output shaft can be absorbed. Further, since the spiral spring uniformly elastically deforms while expanding (or contracting) over the entire circumference, the repulsive force generated from the elastic member can be stabilized. Therefore, according to the present invention, it is possible to avoid the input of “excessive load” to the power motor stably with a compact structure.

  In the seat device of the invention according to claim 3, the reclining device in the deregulated state resumes the regulation by returning the tilt angle of the seat back in the forward tilted state to the standing state. When the position of the operation lever returns to the restricted state, the first reverse switch is energized and the output shaft of the power motor is reversely rotated. Then, the gear follows the output shaft of the power motor that rotates in reverse, and the phase of the gear returns to the state (standby state) before the return mechanism is activated. This gear is provided with a projecting portion, and a stop switch can be brought into contact with the projecting portion. Therefore, when the phase of the gear returns to the standby state before the return mechanism is activated, the projecting portion comes into contact with the stop switch to cut off the power supply and stop the operation of the motor. That is, according to the third aspect of the invention, the occupant simply shifts the seat back angle after returning the seat back angle only by operating the operation switch to give a trigger for starting the power motor. Can do it.

  Furthermore, in the seat device of the invention according to claim 4, when the gear reaches a phase where the inclination angle of the seat back side bracket can be returned to the standing state, the second reverse switch is energized, and the output shaft of the power motor is reversely rotated. To do. Then, the gear is driven by the output shaft of the reversely rotating power motor, and the phase of the gear returns to the state (standby state) before the return mechanism is activated. This gear is provided with a projecting portion, and a stop switch can be brought into contact with the projecting portion. Therefore, when the phase of the gear returns to the standby state before the return mechanism is activated, the projecting portion comes into contact with the stop switch to cut off the power supply and stop the operation of the motor. That is, according to the fourth aspect of the invention, the occupant simply operates the operation switch to give a trigger for starting the power motor, and after the return mechanism tries to return the seat back angle, it shifts to the standby state. It can be done. In other words, even if the seatback cannot be returned to the standing position for some reason, the gear can be reversed within a certain stroke, and the gear can be returned to the standby phase. is there.

  In the seat device according to the fifth aspect of the present invention, since the coil and the switch in the relay disposed between the stop switch and the second reverse switch are connected in series, whether the second reverse switch is energized. Regardless of this, since the switch continues to be energized unless the energization of the stop switch is cut off, the gear can be reliably returned to the standby phase.

  In the seat device of the invention according to claim 6, since the two electrodes of the power motor are respectively connected to the relay, the rotation direction of the output shaft of the power motor is instantaneously switched by switching each switch. In addition, a short circuit can be avoided. Therefore, it is possible to reliably rotate the gear forward / reversely within a predetermined stroke.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below using examples shown in the accompanying drawings.
Example 1
First, FIG. 1 to FIG. 6 show a sheet apparatus 1 according to the first embodiment. As shown in FIG. 1, the seat device 1 includes a seat cushion 11 (virtual line) and a seat back 12 (imaginary line). The return mechanism 4 and the free hinge 5 are arranged on the other side, and the reclining device 2 is arranged on the other side. With this configuration, the tilt angle of the seat back 12 can be adjusted and tilted, and the seat back 12 is mainly used as a rear seat of an automobile.

  First, the seat cushion 11 is attached to a seat cushion side bracket 42 that can be fixed to the floor surface of the vehicle body. On the other hand, the seat back 12 is attached to a seat back side bracket 41.

  In the present embodiment, the reclining device 2 is provided only on one side of the seat back 12 and the seat cushion 11, and the free hinge 5 is provided on the other side, but the reclining device is provided on both sides, A configuration may be adopted in which both reclining devices are connected by a shaft 23 (FIG. 2), rotated synchronously, and interlocked.

  As for the reclining device 2, it is conceivable to adopt a general reclining device that has been conventionally used. More specifically, for example, it is possible to adjust the tilt angle in multiple steps by operating the unlock lever, and of course, the seat back 12 can be quickly tilted forward (tilted forward) to a certain angle to allow the occupant to walk in. Some allow, or some allow the back of the seat back 12 to be used as part of the table and luggage compartment. In the present embodiment, the application in the rear seat is taken into consideration, and therefore a reclining device that can quickly tilt the seat back 12 forward to a desired angle is employed. According to such a configuration, when the occupant operates the operation lever 21, the seat back 12 can be quickly tilted forward until it becomes substantially parallel to the seat cushion 11.

  FIGS. 2A and 2B are views showing the main mechanism of the seat device 1 shown in FIG. The reclining device 2 itself may be a general-purpose device as described above, and includes a seat back side bracket 41 attached to the seat back 12 and a seat cushion side bracket 42 attached to the seat cushion 11.

  The seat back side bracket 41 is attached to the seat cushion side bracket 42 so as to be rotatable about the bearing 22 (FIG. 3). The seat back side bracket 41 and the seat cushion side bracket 42 are regulated at a desired angle by the reclining device 2. Since the spiral spring 28 (FIG. 2) always urges the seat back side bracket 41 in the forward tilt direction, the seat back 12 tilts in the forward tilt direction when the regulation by the reclining device 2 is released. Will be. The tilted seat back 12 is returned to the standing position by the “return mechanism 4” described below.

  In the present invention, as shown in the exploded view of FIG. 3, the “return mechanism 4” includes the power motor 43, the gear 44, the elastic member 45, the seat back side bracket 41, the operation switch SW0, the first reverse rotation switch SW1, and the second reverse rotation. A switch SW2 and a stop switch SW3 are provided, which are assembled between the two seat cushion side brackets 42a and 42b. Hereinafter, each component will be described in detail.

  First, the “power motor 43” is activated by an occupant's operation and is a power source of the return mechanism 4. In the present invention, the type of the power motor 43 is not particularly limited, but it is possible to provide the return mechanism 4 itself at a low cost by adopting a widely used general-purpose motor with a reduction gear. Become. In this embodiment, a two-pole DC motor is employed, and relays RY2 and RY3 are connected to both electrodes (FIGS. 7 to 12). The operation will be described later.

  Next, the “gear 44” is driven by the power motor 43 to rotate (rotate) an elastic member 45 (described later). In this embodiment, the gear 44 is driven by a power transmission mechanism composed of a plurality of gears as shown in FIG. 3, and is a substantially sector-shaped sector gear having a small diameter portion 44S and a large diameter portion 44L. It is composed. The small-diameter portion 44S and the large-diameter portion 44L are provided with projections 44a and 44b, respectively, and a stop switch SW3 (described later) is provided in the projection 44a of the small-diameter portion 44S in the first phase (FIG. 4). A second reversing switch SW2 (described later) is disposed in the projecting portion 44b of the diameter portion 44L so as to be in contact with each other in the second phase (FIG. 6). The gear 44 is provided with a hooking portion 44c that is coaxially rotated integrally with the gear 44 so that the elastic member 45 described below can be hooked.

  Further, the “elastic member 45” has one end hooked on the gear 44 and rotates coaxially, thereby pressing the seat back side bracket 41 on the other end side, and the inclination angle of the seat back 12 is set to the upright state. It is intended to return to When the return mechanism 4 is operated with passengers, luggage, etc. on the back of the seat back 12, the elastic member 45 carries the load despite the forced rotation of the gear 44 by the power motor 43. The seat back side bracket 41 is not forced to be pressed. In other words, the elastic member 45 is elastically deformed between the seat back side bracket 41 and the engaging portion 44c of the gear 44, so that the gear 44 is effectively idled. It is possible to prevent a large load from being applied to the load, and further, an excessive reaction from the seat back side bracket 41 (according to power transmission) does not reach the power motor 43 side. In the present invention, the shape and configuration of the elastic member 45 is not particularly limited as long as it can realize the above-described action, and the adoption of a “string wound spring”, a “torsion spring”, or the like is also conceivable. In this embodiment, a “spiral spring” is employed, and the end portion on the inner diameter side of the spiral spring is hooked to the engaging portion of the gear, and the end portion on the outer diameter side of the spiral spring is connected to the seat back side bracket. Are arranged so that they can be engaged with each other. By adopting such a configuration, when an “excessive load” is generated, the rotation of the output shaft of the power motor 43 can be absorbed within a range of elasticity depending on various dimensions (for example, width dimensions) of the spiral spring. it can. Further, since the spiral spring uniformly elastically deforms while expanding (or contracting) over the entire circumference, the repulsive force generated from the elastic member 45 can be stabilized. In this embodiment, a guide plate 46 is interposed between the elastic member 45 and the seat back side bracket 41 described below so that the elastic member 45 can reliably press the seat back side bracket 41. .

  Further, the “seat back side bracket 41” holds the seat back 12 in a tiltable manner from the forward inclined state to the standing state, and is pressed by the elastic member 45 to return to the standing state. It is. In the present embodiment, the seat back side bracket 41 includes a pin 41a as an engaged portion, and the guide plate 46 is engaged with the pin 41a so as to reliably press.

  The return mechanism of this embodiment includes an electrical control circuit as shown in FIGS. 7 to 12 in addition to the mechanical configuration shown in FIGS. This control circuit includes an operation switch SW0, a first reverse rotation switch SW1, a second reverse rotation switch SW2 and a stop switch SW3 as switches for cooperation with the mechanical configuration.

  The “operation switch SW0” is installed on the inner wall surface that can be operated by the occupant and activates the output shaft of the power motor in the forward rotation direction. More specifically, as shown in the circuit diagram of FIG. 7, the operation switch SW0 has one terminal connected to the anode via the first reverse switch SW1 and the second reverse switch SW2, and the other terminal connected to the relay. Connected to RY1 coil. Therefore, when the operation switch SW0 is energized from the state shown in FIG. 7 (standby state), as shown in FIG. 8, the coil of the relay RY1 is energized to energize the switch, and the relay RY1 The coil of the relay RY2 arranged on the extension of the switch is excited, and the switch of the relay RY2 is switched from the cathode side to the anode side. As a result, the electrode on the relay RY2 side in the power motor 43 becomes the anode, and the electrode on the relay RY3 side becomes the cathode, and the output shaft of the power motor 43 starts in the forward rotation direction, and the gear 44 from the standby state shown in FIG. Rotates clockwise, and simultaneously rotates the elastic member 45 (FIG. 3) to bring the seat back side bracket 41 (FIG. 3) to the standing state (FIG. 1) via the guide plate 46 (FIG. 3). It pushes up.

  The “first reversing switch SW1” is disposed so as to be able to come into contact with the operation lever 21 that performs the regulation and release operation by the reclining device 2, and the output of the power motor 43 when the reclining device 2 is in the regulation release state. While the shaft is normally rotated, the output shaft of the power motor 43 is reversed when the reclining device 2 shifts to the restricted state. Specifically, as shown in the circuit diagram of FIG. 7, the first reversing switch SW1 has one terminal connected to the anode via the second reversing switch SW2 and the other terminal distributed to two circuits. It is possible. Of these two circuits, one circuit is connected to the coil of the relay RY2 via the relay RY1, and the other circuit is connected to the coil of the relay RY3 via the stop switch SW3. That is, the rotation direction of the output shaft of the power motor 43 is determined depending on which circuit the first reverse rotation switch SW1 distributes. When the output shaft of the power motor 43 is activated in the forward direction by energization of the operation switch SW0 and the seat back bracket 41 (FIG. 3) returns to the standing position (FIG. 1), the reclining device 2 is regulated. As shown in FIG. 5, the position (angle) of the operating lever 21 returns to the restricted state, and the pressing portion 21a comes into contact with the first reverse rotation switch SW1. That is, when the pressing portion 21a contacts the first reversing switch SW1, the state shown in FIG. 8 is switched to the state shown in FIG. 9, and the electrode on the relay RY2 side in the power motor 43 is the cathode, and the electrode on the relay RY3 side is It becomes the anode, the output shaft of the power motor 43 is reversed, the gear 44 is rotated in the counterclockwise direction, and the standby phase shown in FIG. 4 is aimed.

  The “stop switch SW3” is disposed so as to be able to come into contact with a protrusion 44a provided on the gear 44 driven by the power motor 43, and the phase of the gear 44 returns to the standby state before the return mechanism 4 is activated. The rotation of the output shaft of the power motor 43 is stopped. More specifically, as shown in the circuit diagram of FIG. 7, the stop switch SW3 has one terminal connected to the anode via the first reverse switch SW1 and the second reverse switch SW2, and the other terminal connected to the relay. Connected to RY3 coil. Accordingly, the first reversing switch SW1 is switched from the state shown in FIG. 8 to the state shown in FIG. 9, the output shaft of the power motor 43 is reversed, and the gear 44 returns to the standby state phase shown in FIG. When the protrusion 44a provided on the gear 44 contacts the stop switch SW3, the state shown in FIG. 9 is switched to the state shown in FIG. 10, and the rotation of the output shaft of the power motor 43 is stopped. In the state shown in FIG. 10, since the anode and the operation switch SW0 are disconnected by the first reversing switch SW1, the return mechanism 4 does not start even if the occupant operates the operation switch SW0. , Reliable prevention of malfunction is achieved.

  The “second reversing switch SW2” is arranged so as to be able to contact the gear 44, and the power motor until the gear 44 reaches a phase where the inclination angle of the seat back side bracket 41 can be returned to the standing position. 43, the output shaft of the power motor 43 is reversely rotated after the gear 44 reaches a phase where the inclination angle of the seat back side bracket 41 can be returned to the standing position. . More specifically, as shown in the circuit diagram of FIG. 7, the second reversing switch SW2 has one terminal connected to the anode and the other terminal capable of being distributed to two circuits. Of these two circuits, one circuit is connected to the stop switch SW3 via the coil of the relay RY4, and the other circuit is connected to the stop switch SW3 via the first reverse switch SW1. is there. That is, the output of the power motor 43 depends on which circuit the second reversing switch SW2 distributes (provided that the first reversing switch SW1 energizes the coil of the relay RY2 via the relay RY1). The rotation direction of the shaft is determined. Although the operation switch SW0 is energized, the output shaft of the power motor 43 is activated in the forward rotation direction, and the gear 44 reaches a phase where the inclination angle of the seat back side bracket 41 can be returned to the standing position. When an occupant, a baggage, or the like is present on the back of the seat back 12, the inclination angle of the seat back 12 is not sufficiently restored, and the regulation of the reclining device 2 cannot be resumed. When the reclining device 2 does not resume the regulation, the position (angle) of the operation lever 21 shown in FIG. 5 does not return to the regulation state, so the pressing portion 21a does not contact the first reverse rotation switch SW1. That is, since the state shown in FIG. 8 does not shift to the state shown in FIG. 9, the output shaft of the power motor 43 is not reversed, and the gear 44 is brought to the phase (second phase) shown in FIG. Here, as shown in FIG. 6, a projection 44b is provided at one end of the large-diameter portion 44L of the gear 44, and the projection 44b comes into contact with the second reverse rotation switch SW2. That is, when the protrusion 44b contacts the second reverse switch SW2, the state shown in FIG. 8 is switched to the state shown in FIG. 11, and the electrode on the relay RY2 side in the power motor 43 is the cathode and the electrode on the relay RY3 side is It becomes the anode, the output shaft of the power motor 43 is reversed, the gear 44 is rotated in the counterclockwise direction, and the standby phase shown in FIG. 4 is aimed. The second reversing switch SW2 is opened due to the reverse rotation of the gear 44 and shifts to the state of FIG. 12. However, since the coil in the relay RY4 connected to the anode and the switch are connected in series, the second switch 2 Since the switch continues to be energized unless the energization of the stop switch SW3 is cut off regardless of the energization state of the reverse rotation switch SW2, the gear 44 returns to the standby state phase shown in FIG. When the protruding portion 44a comes into contact with the stop switch SW3, the state shown in FIG. 12 is switched to the state shown in FIG. 7, and the rotation of the output shaft of the power motor 43 is stopped.

  The seat device 1 according to the present invention can be applied not only to a vehicle seat, but also to adjust the forward tilt angle of the seat back 12 and the seat rail locking mechanism when the return mechanism 4 is operated. If they are linked, it can be used as a device for operating and returning the walk-in mechanism.

It is the figure which showed the outline of the sheet | seat apparatus 1 which concerns on this invention from the side surface. (A) And (b) is the figure shown from the diagonal right and left of the reclining apparatus provided in the seat apparatus shown in FIG. It is a disassembled perspective view of the return mechanism 4 provided in the seat apparatus shown in FIG. It is a figure shown from the operation state side of the return mechanism provided in the seat device shown in Drawing 1, and is a figure showing the state where projection part 44a of gear 44 in the 1st phase contacted stop switch SW3. It is a figure shown from the operating state side of the return mechanism provided in the seat device shown in FIG. 1, and the pressing portion 21a in the operating lever 21 connected to the reclining device 2 that has resumed regulation abuts on the first reverse rotation switch SW1. It is a figure which shows the state which carried out. It is a figure shown from the operation state side of the return mechanism provided in the seat device shown in Drawing 1, and is a figure showing the state where projection part 44b of gear 44 in the 2nd phase contacted the 2nd reversing switch SW2. is there. FIG. 3 is a control circuit diagram of the seat device 1 according to the present invention, and shows a control circuit in which the return mechanism 4 is in a standby state. FIG. 8 is a control circuit diagram shown in FIG. 7 and shows a control circuit in a state where the operation motor SW0 is energized and the power motor 43 is activated. FIG. 9 is a control circuit diagram shown in FIG. 8, showing a control circuit in a state where the first reverse rotation switch SW <b> 1 is switched and the power motor 43 starts reverse rotation. FIG. 10 is a control circuit diagram shown in FIG. 9, showing the control circuit in a state where the stop switch SW3 is switched and the power motor 43 stops operating. FIG. 9 is a control circuit diagram shown in FIG. 8 and shows a control circuit in a state where the second reverse rotation switch SW2 is switched and the power motor 43 starts reverse rotation. FIG. 12 is a control circuit diagram shown in FIG. 11, in spite of the second reverse switch SW2 being switched again, the coil connected in series with the switch in the relay RY4 continues to be excited to operate the power motor 43. It shows the control circuit in a continued state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat apparatus 11 Seat cushion 12 Seat back 2 Reclining apparatus 21 Operation lever 22 Bearing 4 Restoration mechanism 41 Seat back side bracket 42 Seat cushion side bracket 42a Seat cushion side bracket 42b Seat cushion side bracket 43 Power motor 44 Gear 44a Protrusion 44b Protrusion Part 44c Engagement part 44L Large diameter part 44S Small diameter part 45 Elastic member 46 Guide plate 5 Free hinge SW0 Operation switch SW1 First reverse switch SW2 Second reverse switch SW3 Stop switch RY1 Relay RY2 Relay RY3 Relay RY4 Relay

Claims (6)

A seat cushion attached to the vehicle body,
A seat back that is tiltably attached to the seat cushion;
A reclining device for regulating and releasing tilting of the seat back with respect to the seat cushion;
The inclination angle of the seat back that was previously inclined state, a seat assembly having a return mechanism for returning to the upright position capable seated occupant,
The return mechanism is
A power motor activated by the operation of the occupant;
A gear which is driven to the power motor,
A fitting part which coaxially rotate as the gear integrally,
And having one end and the other end portion, an elastic member one end portion is the gear coaxially rotates hooked to the engagement portion,
It is attached to the seat back and engages with the other end of the elastic member , and when the gear and the elastic member rotate coaxially by the power motor, it is rotated by being pressed against the other end of the elastic member. A seat back side bracket that moves and restores the inclination angle of the seat back ,
When a load is applied to the back surface of the seat back when the seat back is restored, the elastic member is elastically deformed between the engaging portion and the seat back side bracket, and the elastic member carries the load. A seat device that idles the gear without forcibly pressing the bracket on the seat back side . The sheet apparatus according to claim 1, wherein
The elastic member is a spiral spring,
A seat characterized in that an end portion on the inner diameter side of the spiral spring is hooked to a hook portion in a gear, and an end portion on the outer diameter side of the spiral spring is disposed so as to be hookable with a seat back side bracket. apparatus. The seat device according to claim 1 or 2 further includes a control circuit that electrically controls the return mechanism,
The control circuit is
An operation switch that is installed on the inner wall surface that can be operated by the occupant and that activates the output shaft of the power motor in the forward rotation direction;
The reclining device is arranged so as to be able to contact an operation lever that performs a regulation and release operation. When the reclining device is in a regulation release state, the output shaft of the power motor is rotated forward, while the reclining device is regulated. A first reversing switch for reversing the output shaft of the power motor when transitioning to a state;
Arranged so as to be able to come into contact with a protrusion provided on a gear driven by the power motor, the rotation of the output shaft of the power motor is stopped when the phase of the gear returns to the standby state before starting the return mechanism. A stop switch;
A sheet apparatus comprising: The seat device according to claim 1 or 2 further includes a control circuit that electrically controls the return mechanism,
The control circuit is
An operation switch that is installed on the inner wall surface that can be operated by the occupant and that activates the output shaft of the power motor in the forward rotation direction;
The output shaft of the power motor is normally rotated until the gear reaches a phase where the inclination angle of the seat back side bracket can be returned to the standing position. A second reversing switch for reversing the output shaft of the power motor after reaching a phase where the inclination angle of the seat back side bracket can be returned to the standing position;
Arranged so as to be able to come into contact with a protrusion provided on a gear driven by the power motor, the rotation of the output shaft of the power motor is stopped when the phase of the gear returns to the standby state before starting the return mechanism. A stop switch;
A sheet apparatus comprising: The sheet apparatus according to claim 4, wherein
Between the stop switch and the second reverse rotation switch, a relay comprising a coil that is excited by energization and a switch that is energized when the coil is in an energized state is disposed.
The coil and switch are arranged in series, the anode is connected to one end, a stop switch is connected to the other end, and a second reversing switch is connected between the coil and the switch. do it,
When the second reverse switch is energized between the coil and the switch, the coil is excited until the stop switch is de-energized regardless of the energization state of the second reverse switch thereafter. A sheet device characterized in that the energized state of the accompanying switch is continued. In the sheet apparatus according to any one of claims 1 to 5,
The power motor consists of a two-pole DC motor, and both electrodes are connected to relays (RY2, RY3),
Both relays (RY2, RY3) are connected to the cathode when the return mechanism is inactive.
One relay (RY2) is connected to the anode when the operation switch is energized,
The other relay (RY3) is connected to the anode when the first reverse switch or the second reverse switch is energized.

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