CN207190866U - Power seat before and after headrest - Google Patents

Abstract

The utility model discloses power seat before and after a kind of headrest, it is provided with backrest and headrest, the backrest is provided with supporting part and rotation section, the bottom of the supporting part is hinged with armchair basin, the top of the supporting part is hinged at pin joint a with rotation section, and the headrest is fixed on the rotation section；Drive device is set in the supporting part, the drive device drives the rotation section is front and rear to rotate, the drive device is connected by on-off circuit with power supply, the break-make of the on-off circuit is controlled by range sensor, the range sensor is arranged on the headrest, and the range sensor is used to detect the distance between head part and headrest.Beneficial effect：Using power seat before and after headrest of the present utility model, the distance between people's hindbrain and headrest can be automatically adjusted, ensures the safety of passenger.

Description

Front and rear automatic adjustment seat

technical field

The utility model relates to the field of automobile seats, in particular to a seat with front and rear automatic adjustment of a headrest.

Background technique

The car headrest is a kind of driving comfort configuration product and safety protection product. When the vehicle collides with the rear, the human body will fall backward due to inertia. At this time, the pressure of vehicle acceleration or deceleration is concentrated on the fragile neck and head of the human body. The headrest then acts as a buffer to protect the human head. While driving, the smaller the distance between the back of the head and the headrest, the better. In this way, it can play a cushioning effect on the neck during a collision.

Because people's figures are different, the distance between the headrest and the back of the head is also different when people sit on the seat, which requires adjustment of the headrest. However, no matter the existing headrests are manually adjusted or automatically adjusted, manual operations are required, which is inconvenient to operate. Therefore, most people tend to ignore this point. Moreover, it is impossible for a person to maintain the same sitting posture while driving, so the distance between the back of the head and the headrest also changes.

Utility model content

In order to solve the above technical problems, the utility model provides an automatic front and rear headrest adjustment seat, which can automatically adjust the distance between the headrest and the back of the head, so that the distance between the back of the head and the headrest is always kept at Within the safe range, no manual operation is required, and the degree of intelligence is high.

The technical solution is as follows:

A seat with front and rear automatic headrest adjustment, which is provided with a seat back and a headrest. The top is hinged with the rotating part at the hinge point a, and the headrest is fixed on the rotating part;

A driving device is arranged in the supporting part, and the driving device drives the rotating part to rotate back and forth, and the driving device is connected to the power supply through a switch circuit, and the switching of the switching circuit is controlled by a distance sensor, and the distance sensor is arranged on the head On the pillow, the distance sensor is used to detect the distance between the human head and the headrest.

With the upper structure, the distance sensor can detect the distance between the back of the head and the headrest. If the distance is greater than the safety distance, the distance sensor will output a voltage lower than the reference voltage value. At this time, the driving device will drive the rotating part to drive the headrest forward. Turn to keep the distance between the back of your head and the headrest within a safe range.

Furthermore, the drive device includes a biaxial drive motor, the two rotating shafts of the biaxial drive motor respectively drive two transmission mechanisms to rotate, the two transmission mechanisms are respectively arranged on the two inner sides of the support part, and the two transmission mechanisms The transmission mechanism drives the rotating part to rotate back and forth, and the biaxial drive motor is connected to the power supply through a switch circuit.

With the above structure, the transmission mechanisms located on the left and right sides of the supporting part can drive the rotating part to rotate as a whole, thereby enhancing the overall stability between the supporting part and the rotating part.

Furthermore, the transmission mechanism includes a gear box and a rolling screw, the connecting shaft in the gear box is connected to the rotating shaft, and the gear box drives the rolling screw to rotate;

The inner side wall of the support part is provided with a displacement slider matched with the rolling screw rod, and the side wall of the support part where the displacement slider is located is provided with an arc-shaped limiting hole, and the displacement slider The block is provided with a connecting rod, one end of which is fixed to the displacement slider, and the other end is movably connected to the rotating part through the arc-shaped limiting hole, and the center of the arc section of the arc-shaped limiting hole is the hinge point a

With the above structure, the rotating shaft drives the worm wheel to rotate vertically, the worm drives the screw to rotate horizontally, and the horizontally rotating rolling screw drives the displacement slider to move up and down. Thus, the displacement slider drives the rotating part to move up and down along the arc-shaped limiting hole, so that the rotating part rotates forward, thereby keeping the distance between the back of the head and the headrest within a safe range.

Furthermore, the switch circuit is provided with a first voltage comparator, the non-inverting input terminal of the first voltage comparator U1 is connected to the power supply through the first resistor, and the non-inverting input terminal is also grounded through the second resistor, the first voltage comparator U1 The inverting input terminal is connected to the output terminal of the distance sensor;

The output terminal of the first voltage comparator is connected to the base of the first triode through the third resistor, the collector of the first triode is connected to the power supply, the emitter is connected to one end of the first relay coil, and the other end of the first relay coil grounded, and the normally open switch of the first relay is connected in series with the power supply circuit of the driving device.

With the above structure, when the distance between the back of the head and the headrest is greater than the safety distance, the voltage output by the distance sensor will decrease, the first voltage comparator will output a high level, the normally open switch of the first relay will be closed, and the driving device will The power supply circuit is turned on, and the driving device is powered to drive the rotating part to rotate forward until the distance between the headrest and the back of the head reaches a safe distance.

Further, the switch circuit is provided with a pressure sensor, a first proximity switch and a second proximity switch, wherein the pressure sensor is arranged on the seat pan, and the sensors of the first proximity switch and the second proximity switch They are all arranged on the side wall of the support part, the sensors of the first proximity switch and the second proximity switch are respectively located at the highest position and the lowest position of the moving path of the displacement slider, and the first proximity switch The switch and the transmitter of the second proximity switch are arranged on the displacement slider;

The output end of the pressure sensor is connected to the base of the second triode, the collector of the second triode is connected to the power supply, the emitter is connected to the non-inverting input end of the second voltage comparator through the fourth resistor, and the second voltage The noninverting input terminal of the comparator is also grounded through the fifth resistor, and the inverting input terminal of the second voltage comparator is connected to the output terminal of the distance sensor;

The output terminal of the second voltage comparator is connected with the base of the third triode through the sixth resistance, the collector of the third triode is connected with the power supply, the emitter is connected with one end of the second relay coil, and the second relay coil The other end is connected in series with the coil of the third relay and grounded, and the normally open switches of the second relay and the third relay are connected in series in the first power supply circuit of the driving device;

One end of the first proximity switch is connected to the power supply, the other end is connected to one end of the seventh relay coil, the other end of the seventh relay coil is grounded, and the normally closed switch of the seventh relay is connected in series with the third three-pole between the emitter of the tube and the second relay coil;

The output terminal of the pressure sensor is also connected with the inverting input terminal of the third voltage comparator, the non-inverting input terminal of the third voltage comparator is connected with the power supply through the seventh resistor, and the non-inverting input terminal of the third voltage comparator is also connected Grounded through the eighth resistor;

The output end of the third voltage comparator is connected to the base of the fourth transistor through the ninth resistor, the collector of the fourth transistor is connected to the power supply, and the emitter is connected to one end of the fourth relay coil. The other end of the coil of the four relays is connected in series with the coil of the fifth relay and grounded, and the normally open switches of the fourth relay and the fifth relay are connected in series in the second power supply circuit of the driving device;

One end of the second proximity switch is connected to the power supply, the other end is connected to one end of the sixth relay coil, the other end of the sixth relay coil is grounded, and the normally closed switch of the sixth relay is connected in series with the fourth three-pole between the emitter of the tube and the fourth relay coil.

With the above structure, when there is a person on the seat, the pressure sensor outputs a high level. At this time, if the distance sensor detects that the distance between the back of the person's head and the headrest is greater than the safety distance, the first power supply circuit of the drive device will be turned on. The driving device can drive the rotating part to rotate forward, so as to reduce the distance between the back of the human head and the headrest.

When no one is on the seat, the second power supply circuit of the driving device is turned on, and the driving device drives the rotating part to rotate backward, so that the headrest returns to the initial position. This allows the head restraint to automatically adjust the next time someone else is sitting in that position.

When the displacement slider reaches the highest position or the lowest position, the first proximity switch and the second proximity switch will be turned on, so that the first power supply circuit or the second power supply circuit will be disconnected, and the driving device will stop working immediately to avoid excessive displacement of the slider. move and damage the seat.

Beneficial effects: the front and rear automatic adjustment seat of the headrest of the utility model can automatically adjust the distance between the back of the head and the headrest to ensure the safety of passengers.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of the driving device of the present utility model;

Fig. 3 is the local schematic diagram of transmission mechanism;

Fig. 4 is the circuit diagram of embodiment one;

Fig. 5 is a circuit diagram of the second embodiment.

Detailed ways

Below in conjunction with embodiment and accompanying drawing, the utility model is further described.

Embodiment 1. As shown in Figures 1-4, a seat with front and rear automatic adjustment of the headrest is provided with a seat back 1 and a headrest 2. The seat back 1 is provided with a support part 3 and a rotating part 4. The support The bottom of the support part 3 is hinged with the seat pot 5, the top of the support part 3 is hinged with the rotating part 4 at the hinge point a, and the headrest 2 is fixed on the top of the rotating part 4;

A drive device is arranged in the support part 3, and the drive device drives the rotating part 4 to rotate back and forth. The drive device is connected to the power supply through a switch circuit, and the on-off of the switch circuit is controlled by a distance sensor 6, and the distance sensor 6 is set On the headrest 2 , the distance sensor 6 is used to detect the distance between the human head and the headrest 2 .

The drive device includes a biaxial drive motor 7, the two rotating shafts 8 of the biaxial drive motor 7 respectively drive two transmission mechanisms 9 to rotate, and the two transmission mechanisms 9 are respectively arranged on the left and right sides of the support part 3, and the two transmission mechanisms The transmission mechanism 9 drives the rotating part 4 to rotate back and forth, and the biaxial drive motor 7 is connected to the power supply through a switch circuit.

The transmission mechanism 9 includes a gear box 10 and a thread rolling screw 11, and the biaxial drive motor 7 drives the gear box 10 to drive the thread rolling screw 11 to rotate horizontally.

The inner side wall of the support part 3 is provided with a displacement slider 12 matched with the rolling screw rod 11, and the side wall of the support part 3 where the displacement slider 12 is located is provided with an arc-shaped limiting hole. 13. The displacement slider 12 is provided with a connecting rod, one end of which is fixed to the displacement slider 12 , and the other end is movably connected to the rotating part 4 through the arc-shaped limiting hole 13 .

The switch circuit is provided with a first voltage comparator U1, the non-inverting input terminal of the first voltage comparator U1 is connected to the power supply through the first resistor R1, the non-inverting input terminal is also grounded through the second resistor R2, the first voltage comparator U1 The inverting input terminal is connected to the output terminal of the distance sensor 6;

The output terminal of the first voltage comparator U1 is connected to the base of the first triode T1 through the third resistor R3, the collector of the first triode T1 is connected to the power supply, and the emitter is connected to one end of the coil of the first relay D1. The other end of the coil of the relay D1 is grounded, and the normally open switch of the first relay D1 is connected in series with the power supply circuit of the driving device.

Embodiment 2. The structure of embodiment 2 is substantially the same as that of embodiment 1, and the main difference lies in the switch circuit.

As shown in Figure 5, the switch circuit is provided with a pressure sensor 14, a first proximity switch K1 and a second proximity switch K2, wherein the pressure sensor 14 is arranged on the seat pan 5, and the first proximity switch K The inductors of the first proximity switch K and the second proximity switch K2 are all arranged on the side wall of the support part 3, and the inductors of the first proximity switch K and the second proximity switch K2 are respectively located on the moving path of the displacement slider 12. At the highest position and the lowest position, the transmitters of the first proximity switch K and the second proximity switch K2 are arranged on the displacement slider;

The output terminal of the pressure sensor 14 is connected to the base of the second triode T2, the collector of the second triode T2 is connected to the power supply, and the emitter is connected to the non-inverting input terminal of the second voltage comparator U2 through the fourth resistor R4 connected, the noninverting input terminal of the second voltage comparator U2 is also grounded through the fifth resistor R5, and the inverting input terminal of the second voltage comparator U2 is connected to the output terminal of the distance sensor 6;

The output terminal of the second voltage comparator U2 is connected to the base of the third transistor T3 through the sixth resistor R6, the collector of the third transistor T3 is connected to the power supply, and the emitter is connected to one end of the coil of the second relay D2. The other end of the coil of the second relay D2 is connected in series with the coil of the third relay D3 and grounded, and the normally open switches of the second relay D2 and the third relay D3 are connected in series in the first power supply circuit of the driving device;

One end of the first proximity switch K1 is connected to a power supply, the other end is connected to one end of the coil of the seventh relay D7, the other end of the coil of the seventh relay D7 is grounded, and the normally closed switch of the seventh relay D7 is connected in series to the between the emitter of the third triode T3 and the coil of the second relay D2;

The output terminal of the pressure sensor 14 is also connected with the inverting input terminal of the third voltage comparator U3, the non-inverting input terminal of the third voltage comparator U3 is connected with the power supply through the seventh resistor R7, and the third voltage comparator U3 The non-inverting input terminal of is also grounded through the eighth resistor R8;

The output terminal of the third voltage comparator U3 is connected to the base of the fourth transistor T4 through the ninth resistor R9, the collector of the fourth transistor T4 is connected to the power supply, and the emitter is connected to the coil of the fourth relay D4. One end is connected, the other end of the coil of the fourth relay D4 is connected in series with the coil of the fifth relay D5 and grounded, and the normally open switches of the fourth relay D4 and the fifth relay D5 are connected in series to the second power supply circuit of the driving device middle;

One end of the second proximity switch K2 is connected to a power supply, the other end is connected to one end of the coil of the sixth relay D6, the other end of the coil of the sixth relay D6 is grounded, and the normally closed switch of the sixth relay D6 is connected in series to the Between the emitter of the fourth triode T4 and the coil of the fourth relay D4.

Finally, it should be noted that the above description is only a preferred embodiment of the utility model, and under the inspiration of the utility model, those skilled in the art can make many A similar representation, such transformations all fall within the protection scope of the present utility model.

Claims (5)

1. A seat with front and rear automatic headrest adjustment, which is provided with a seat back (1) and a headrest (2), characterized in that: the seat back (1) is provided with a support portion (3) and a rotating portion (4 ), the bottom of the support part (3) is hinged with the seat pan (5), the top of the support part (3) is hinged with the rotating part (4) at the hinge point a, and the headrest (2) is fixed on the The top of the rotating part (4); A driving device is arranged in the support part (3), and the driving device drives the rotating part (4) to rotate back and forth around the hinge point a. The driving device is connected to the power supply through a switch circuit, and the switching circuit is controlled by a distance sensor. (6) control, the distance sensor (6) is arranged on the headrest (2), and the distance sensor (6) is used to detect the distance between the human head and the headrest (2). 2. According to claim 1, the front and rear automatic adjustment seat of the headrest is characterized in that: the driving device is provided with a biaxial drive motor (7), and the two rotating shafts (8) of the biaxial drive motor (7) are respectively Drive the two transmission mechanisms (9) to rotate, the two transmission mechanisms (9) are respectively arranged on the left and right sides of the support part (3), and the two transmission mechanisms (9) drive the rotation part (4) to rotate back and forth, The biaxial drive motor (7) is connected to the power supply through a switch circuit. 3. According to claim 2, the front and rear automatic adjustment seat of the headrest is characterized in that: the transmission mechanism (9) is provided with a rolling screw (11) and a gear box (10), and the gear box (10) is fixed On the support portion (3), the biaxial drive motor (7) drives the rolling screw (11) to rotate horizontally through the gear box (10); The inner side wall of the support part (3) is provided with a displacement slider (12) matched with the rolling screw rod (11), and the displacement slider (12) is located on the side of the support part (3). The side wall is provided with an arc-shaped limiting hole (13), and the displacement slider (12) is provided with a connecting rod, one end of which is fixed to the displacement slider (12), and the other end passes through the arc. The shape limiting hole (13) is flexibly connected with the rotating part (4); The center of the arc segment of the arc-shaped limiting hole (13) is the hinge point a. 4. According to claim 3, the front and rear automatic headrest adjustment seat is characterized in that: the switch circuit is provided with a first voltage comparator (U1), and the non-inverting input terminal of the first voltage comparator U1 is connected through the first resistor. (R1) is connected to the power supply, the same phase input terminal is also grounded through the second resistor (R2), and the inverting input terminal of the first voltage comparator (U1) is connected to the output terminal of the distance sensor (6); The output terminal of the first voltage comparator (U1) is connected to the base of the first triode (T1) through the third resistor (R3), the collector of the first triode (T1) is connected to the power supply, and the emitter is connected to the first One end of the coil of the relay (D1) is connected, the other end of the coil of the first relay (D1) is grounded, and the normally open switch of the first relay (D1) is connected in series with the power supply circuit of the driving device. 5. The front and rear automatic headrest adjustment seat according to claim 3, characterized in that: the switch circuit is provided with a pressure sensor (14), a first proximity switch (K1) and a second proximity switch (K2), wherein, The pressure sensor (14) is arranged on the seat pan (5), and the sensors of the first proximity switch (K) and the second proximity switch (K2) are both arranged on the side wall of the support part (3) Above, the sensors of the first proximity switch (K) and the second proximity switch (K2) are respectively located at the highest position and the lowest position of the moving path of the displacement slider (12), and the first proximity switch (K) and the transmitter of the second proximity switch (K2) are arranged on the displacement slide block; The output end of the pressure sensor (14) is connected to the base of the second triode (T2), the collector of the second triode (T2) is connected to the power supply, and the emitter is connected to the second triode through the fourth resistor (R4). The non-inverting input terminal of the voltage comparator (U2) is connected, and the non-inverting input terminal of the second voltage comparator (U2) is also grounded through the fifth resistor (R5), and the inverting input terminal of the second voltage comparator (U2) is connected with The output terminal connection of distance sensor (6); The output terminal of the second voltage comparator (U2) is connected to the base of the third transistor (T3) through the sixth resistor (R6), the collector of the third transistor (T3) is connected to the power supply, and the emitter is connected to the first One end of the coil of the second relay (D2) is connected, and the other end of the coil of the second relay (D2) is connected in series with the coil of the third relay (D3) and grounded, and the normal of the second relay (D2) and the third relay (D3) The switch is connected in series in the first power supply circuit of the driving device; One end of the first proximity switch (K1) is connected to the power supply, the other end is connected to one end of the seventh relay (D7) coil, the other end of the seventh relay (D7) coil is grounded, and the seventh relay (D7) The normally closed switch is connected in series between the emitter of the third triode (T3) and the coil of the second relay (D2); The output terminal of the pressure sensor (14) is also connected with the inverting input terminal of the third voltage comparator (U3), and the non-inverting input terminal of the third voltage comparator (U3) is connected with the power supply through the seventh resistor (R7), The non-inverting input terminal of the third voltage comparator (U3) is also grounded through the eighth resistor (R8); The output terminal of the third voltage comparator (U3) is connected to the base of the fourth triode (T4) through the ninth resistor (R9), and the collector of the fourth triode (T4) is connected to the power supply to emit pole is connected with one end of the coil of the fourth relay (D4), and the other end of the coil of the fourth relay (D4) is connected in series with the coil of the fifth relay (D5) and grounded, and the fourth relay (D4) and the fifth relay ( The normally open switch of D5) is connected in series in the second power supply circuit of the drive device; One end of the second proximity switch (K2) is connected to the power supply, the other end is connected to one end of the sixth relay (D6) coil, the other end of the sixth relay (D6) coil is grounded, and the sixth relay (D6) The normally closed switch is connected in series between the emitter of the fourth triode (T4) and the coil of the fourth relay (D4).