JPS6280145A - Seat belt device for vehicle - Google Patents

Abstract

PURPOSE:To improve safety, by a method wherein, in a device which is designed to automatically fasten a seat belt when a driver seats on a seat, a hook, to which a seat belt is locked when no driver is present in a car, is so formed that it can be projected and retracted. CONSTITUTION:When no driver is present in a car, relay contacts S1 and S2 and limit switches 17 and 18 are situated in a position shown by a solid line, a hook 4 is projected from the upper surface of a body 1, and an about intermediate part of a shoulder belt B is locked to the hook 4. With this state, a driver opens a door 24 to ride on, and when the closes the door 24 after seating on a seat 23, according to outputs from a seating detecting means and a door opening and closing sensor, the relay contact S2 is switched to the normally- opened contact NO4 side through the working of a control part to forward-rotate a motor 7. This causes the hook 4 to be retracted in the body 1 through a gear means, and causes the shoulder belt B from being released from locking to force the belt B to be tightly fastened against the half body of a driver.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a vehicular seat belt device, and more specifically to a vehicular seat belt in which a seat belt is automatically fastened when an occupant is seated on a seat. 1 - Regarding the device.

(Background technology) Recently, it has become a legal requirement to wear seat belts, but until now, passengers have been forced to fasten their seat belts when they are seated in a vehicle to ensure their safety. Various seat belt devices for vehicles have been provided. In most of these, the seat belt is stretched in advance in the car using an appropriate hook to receive the passenger when the passenger is not in the car, and when the passenger is seated and the door is closed, the seat belt is Door closing action.

Alternatively, the engine starting operation is electrically detected, and the seatbelt is released from the hook or the like based on this detection signal, thereby tightly attaching the seatbelt to the occupant's body.

However, in these conventional examples, there is a safety problem because the hook for hooking the seat belt protrudes into the interior of the vehicle, and there is also the drawback that it is not easy to select the location for installing it. (Objective of the Invention) The present invention has been proposed in view of the above points, and its object is to configure a hook for hooking a seatbelt to be retractable when an occupant is not in the seat. It is an object of the present invention to provide a seat belt device for a vehicle, which improves safety by recessing the hook when the belt is worn, that is, while the vehicle is running, and further increases the degree of freedom in selecting the attachment location.

(Disclosure of the Invention) The present invention will be described below with reference to the drawings. Figures 1 to 8
The figures show a first embodiment of the present invention. First, FIG. 1 is a side view of the present invention, and in the figure, numeral 1 indicates a box-shaped main body surrounded by a frame 2 and a cover 3. FIG.

A hook 4 for hooking a shoulder belt B of a three-point support type or two-point support type seat belt is protruded from the top surface of the main body 1 so as to be freely retractable. Here, the hook 4 is made of a material with a small coefficient of friction and sufficient strength, and when hook 4 is retracted, the shoulder belt B
It has a tapered shape that tapers toward the tip so that it can be opened smoothly.

Further, at the upper and lower ends of the back surface of the main body 1, anti-vibration rubber 5 is provided for attaching the present invention to, for example, the inner surface of the driver's side door of a vehicle.
, 6 are arranged respectively.

Next, to explain the internal structure of the main body 1 in detail, as shown in FIG. 2, a motor 7 capable of forward and reverse rotation is fixed to the inner surface of the frame 2. A worm gear 8 held by a bearing (not shown) is attached, and this worm gear 8 meshes with a worm wheel 9 as an intermediate gear. A pinion 10 is coaxially and integrally fixed to the worm wheel 9 via a shaft 19, and the pinion 10 meshes with a rack 11 that is movable in the vertical direction.

The lower end of the hook 4 is integrally connected to the side of the upper end of the rack 11, and the motor 7 and the worm gear 8
, worm wheel 9, pinion 10 and rack 11
The driving device +1ffD for the hook 4 is constituted by the above. Furthermore, a lower end portion of the guide portion 12 surrounding the hook 4;
A stopper rubber 13 for absorbing the impact of the rack 11 that has reached the top dead center or the vicinity of the bottom dead center is located near the location where the connecting portion of the rack 11 with the hook 4 that has reached the bottom dead center is located.
．． 14 are arranged respectively.

Further, as shown in detail in FIG. 3, cams 15.16 of mutually different shapes are integrally formed below the worm wheel 9, and each cam 15.16 is arranged close to the cams 15.16. Each actuator of the limit switches 17 and 18 can be suppressed.

These limit switches 17 and 18 are for stopping the rotation of the motor 7 and electrically braking the motor 7 to reduce the kinetic energy of the rack 11 due to inertia. connected to the drive circuit.

That is, in FIG. 4, the power supply Vcc and the ground GN
A series circuit consisting of relay contact S1, motor 7, relay contact S2, and limit switch 18 is connected between D and relay contact S so that the current flowing into motor 7 is in the opposite direction.
2, the motor 7, the relay contact S, and the limit switch 17 are connected in a series circuit, and the terminals at both ends of the motor 7 are connected to each limit switch 17.1.
8 normally open contacts N Ol, N O, l, respectively. In addition.

In the figure, NC1 and NC2 are normally closed contacts of limit switches 17 and 18, and NC4 is a relay contact S2.
The normally open contacts, NC, and NC, are also normally closed contacts, and C indicates the respective common contacts. In addition, here, relay contact S□
+Sz is provided together with a relay coil and the like in a control section not shown in FIGS. 1 to 3.

Next, this operation will be explained. First, relay contact S
2 and limit switches 17 and 18 are in the state shown by the solid line in FIG. 4, the hook 4 is attached to the main body 1 as shown in FIG.
As shown in FIG. 7, when the vehicle is not in the vehicle, approximately the middle portion of the shoulder belt B is hooked to the hook 4, and the entire shoulder belt B is suspended inside the vehicle. Here, in FIG. 7, 20 is a buckle, 21 is a guide ring, 22 is a belt winding device, 23 is a seat, 2
4 indicates a door.

When the first occupant sits on the seat 23 and closes the door 24, the load sensor installed at the bottom of the seat 23 and the opening/closing sensor of the door 24 (none of which are shown) detect this, and the controller is activated. The relay contact S2 is switched to the normally open contact NO4 side as shown by the broken line in FIG. This causes the power supply Vcc to pass through the relay contact S, the motor 7, the relay contact S2, and the limit switch 18 to the ground G.
A circuit leading to ND is formed, and the motor 7 rotates forward. Therefore, the rotation of the motor 7 is transmitted to the rack 11 via the worm gear 8, worm wheel 9 and pinion 10, and the hook 4 connected to the rack 11 is lowered as shown in FIG. Thereafter, when the rack 11 reaches the bottom dead center as shown in FIG. 6, the hook 4 is completely retracted, so that the shoulder belt B is tightly attached to the upper body of the occupant as shown in FIG.

In addition, when the hook 4 is completely retracted, the cam 16
drives the limit switch 18, which is normally closed contact NC
Since the contact No. 2 is opened from the No. 2 side and brought into contact with the normally closed contact No. 2, the power to the motor 7 is cut off and the motor 7 is stopped. At this time, since both terminals of the motor 7 have the same potential, the current of the motor 7 is forced to O, and an electric brake is applied to the motor 7, causing its rotation to stop rapidly. During this time, the relay contact S2 is switched to the normally closed contact NC4 side.

That is, the electric braking action on the motor 7 and the absorption of wI;H by the stopper rubber 14 combine to absorb or reduce the kinetic energy due to the stiffness of the rack 11. This can prevent problems such as gear corrosion and sticking.

In this way, when driving the vehicle with the hook 4 recessed inside the main body 1, and then stopping and getting out of the vehicle, the relay contact S1 is normally closed via the control unit by a sensor that detects, for example, that the engine has stopped. Switch to contact No. 3 side, and connect relay contact S2. from power supply Vcc. Ground G via motor 7, relay contact S1 and limit switch 17
A circuit leading to ND is formed to reverse the motor 7. As a result, the rack 11 and the hook 4 rise through the same power transmission path as described above, and the hook 4 protrudes from the top surface of the main body 1, so that the occupant hooks the shoulder belt B to the hook 4 as shown in FIG. 7 again. condition and get off the car. When the rack 11 and the hook 4 are raised, the limit switch 17 is switched by the cam 15, and the motor 7 is electrically braked in the same manner as described above, and the shock of the rack 11 is absorbed by the stopper rubber 13.

Next, FIGS. 9 to 12 show a second embodiment of the present invention. This embodiment is characterized in that, in place of the rack 11 in the first embodiment, a drive device D' is provided for driving the hook 4 by a slider 26 driven by the worm wheel 25. In other words, an operating pin 27 is provided protruding from the side surface of the worm wheel 25 meshed with the worm gear 8, and a lower end of the hook 4 is attached to the end of the slider 26, which is provided with an elongated hole 28 that engages with the operating pin 27. The hooks 4 are integrally connected, and the hook 4 is moved up and down via a slider 26 as the worm wheel 25 rotates, as shown in FIGS. 9 to 11.

Further, as shown in FIG. 12, below the worm wheel 25 there is a cam 15 having different shapes from each other, similar to the first embodiment.
．． 16 are integrally formed, and these cams 15.
Limit switches 17, 18 are provided respectively, the actuators of which are pressed by 16. Furthermore, a stopper spring 29 in the form of a leaf spring is attached to the bottom surface of the frame 2 so that its tip abuts on the outer peripheral surface of one of the cams 16. In addition.

Since the other configurations are substantially the same as those in the first embodiment, the same members are given the same reference numerals and detailed description thereof will be omitted.

9, which corresponds to the non-riding state, the worm wheel 25 rotates and the hook 4 descends via the slider 26 as shown in FIG. 10 after the occupant gets on the vehicle. Then, as shown in FIG.
As shown in FIG. 11B or FIG.
5 and the slider 26, the impact when the hook 4, which moves up and down, stops can be absorbed in the same manner as in the first embodiment.

Furthermore, the limit switches 17 and 18 are connected to the 1000-tuff drive circuit shown in FIG. It operates to stop the engine.

According to this embodiment, compared to the rack and pinion system of the first embodiment, the length of the entire device along the axial direction of the hook 4 can be shortened, and the advantage is that the seat belt device can be made smaller. be.

In each of the above embodiments, the case where the seat belt is attached to the driver's body has been described, but it goes without saying that the present invention is also applicable to attachment to various animals and large pieces of luggage.

Furthermore, it is of course possible to use the present invention by attaching it to the passenger seat side of a vehicle.

(Effects of the Invention) As described above, according to the present invention, there is provided a seat belt that can be attached to an occupant on a seat of a vehicle, and a retractable hook that can hook the seat belt and release the hook. , and a drive device that drives the hook depending on the presence or absence of the occupant, so there is no fear that the occupant will come into contact with the retracted hook while the vehicle is running, and safety is greatly improved. .

Furthermore, even if one main body is placed near the occupant, there is no risk of contact with the hook, so mounting the main body has the advantage of increasing the degree of freedom in selecting the position.

[Brief explanation of drawings]

1 to 8 show a first embodiment of the present invention, FIG. 1 is a side view of the main body, FIG. 2 is a front view showing the internal structure of the main body, and FIG. 3 is the same as that of FIG. AA sectional view, FIG. 4 is a motor drive circuit diagram, FIGS. 5 and 6 are operation explanatory diagrams,
7 and 8 are perspective views showing the state of use, and FIGS. 9 to 12 show a second embodiment of the present invention.
Figure (a). Figures 10 (a) and 11 (a) are front views showing the internal structure of the main body, Figures 9 (b), 10 (b), and 11 (
B) is an explanatory diagram of the operation of the cam, and FIG. 12 is a sectional view taken along line E-E in FIG. 10(A). 4... Hook 7... Motor 8... Worm gear 9.25... Worm wheel 10... Pinion 11... Rack z3... Seat 26...
Slider 27... Operating pin 28... Long hole B
... Shoulder belt as a seat belt D, D
'... Drive device patent applicant Mitsubishi Motors Corporation No. 1P3B Tsuta Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Rod Figure 9 (A) Figure 1O Figure 1] Figure (A) 4 Rod Figure 12

Claims (1)

[Claims] A seat belt that can be attached to an occupant on a seat of a vehicle, a retractable hook that can hook the seat belt and release the hook, and a drive device that drives the hook depending on the presence or absence of the occupant. A vehicle seat belt device comprising: