JPS5839549B2 - Safety belt locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking device for a safety belt for use in a vehicle, which device comprises a reel on which the band of the safety belt can be wound, and at least one locking device for locking the safety belt in the event of a sudden change in the speed of the vehicle. A locking mechanism is included to prevent rotation of the reel in this direction.

The device further comprises an inertial body capable of changing position in response to abnormal changes in vehicle speed, and sensing changes in the position of said inertial body and thereby positioning and unlocking the reel. and a holding mechanism that can be moved between positions.

As a practical matter, it is desirable to be able to mount the reel at different locations within the vehicle, ie to mount the reel within the vehicle at different locations.

However, it is necessary to take into account the forces acting on the inertial body when installing the reel, and therefore the angle of inclination of the inertial body at its rest position relative to the vehicle cannot be changed.

Conventionally, it has been proposed that the mounting has a frame in which the inertial body is housed and is rotatable with respect to the housing of the reel.
In this case, the rotatable mounting is such that the frame is attached to the end wall portion of the reel housing.

However, depending on this structure, it is not possible to mount the housing of the locking device at a displacement position in a plane extending through the axis of rotation of the reel, for example, when the axis of rotation of the reel extends in the horizontal or vertical direction. It is impossible to install the device in this manner.

The purpose of the present invention is to ensure that the axis of rotation of the reel is between the stopping position of the inertial body, the horizontally extending direction, and the vertically extending direction.
It is an object of the present invention to provide a locking device for a vehicle safety belt in which the reel can be attached at different positions within the belt.

The above-mentioned object of the present invention is to mount the inertial body internally by mounting the frame rotatably with respect to the reel housing, and by mounting one side to the frame I.
The inertial body is connected to the reel locking mechanism by a holding mechanism consisting of a pair of transmission members, the other of which is disposed in the housing, and the pair of transmission members are attached to the housing at a point on the axis of rotation of the frame. This is accomplished by arranging them so that they are in contact with each other and biased by a spring.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIGS. 1 and 2 show a locking device from a reel 3 rotatably supported on a shaft 2 in a housing 1, and a seatbelt band (not shown) is mounted on the reel 3. can be wound by the action of a helical spring 4, which has one end attached to the housing 1 and the other end inserted into a notch 5 in one end of the shaft 2.

A balance wheel 6, which is rotatable with respect to the reel 3 and its shaft 2, is attached to the other end of the shaft 2; can.

This mobility is provided by a hub 7 mounted on the shaft 2, which hub 7 is provided with two radially oriented pins 8.

The hub 7 is movable within a central cavity 9 formed in the balance wheel 6, and the limits of the movement of the hub γ are determined by joining the pins 8 to the end walls 10 of two recesses in the cavity 9. , pins 8 extend into these recesses.

Furthermore, the balance wheel 6 is provided with two grooves 11,
These grooves 11 are open to the outside in the radial direction, and a pawl 12 is movable within each groove 11.

Viewed in the radial direction, the inner end of the winter melon extends within a pocket 13, which pocket 13 is positioned such that the claws 12 extend in a direction offset to some extent from the radial direction.

In order to hold the claw 12 at a predetermined position on which the inner end thereof is placed in the pocket 13, a holding plate 14 extending in a direction intersecting the claw 12 is provided.

The retaining plate 14 is elastic, which ensures the return movement of the retaining plate after an outward movement, as will be explained in more detail below.

A locking surface 15 is formed on the inside of the casing 1 facing the balance wheel 6 and extends along its outer periphery. It has a number of teeth arranged to engage with 12.

The locking device of the invention is arranged to lock the drawer of the safety belt band itself with an acceleration force exceeding a predetermined low value.

This is achieved by the pawl 12 whose free end 12' is pressed outwards due to the inertia of the balance wheel and the associated movement between the hub and the balance wheel upon acceleration of the rotational movement of the shaft 2, i.e. the hub 7; The pawl 12 thereby engages the toothed locking surface 15 and the reel is locked against rotation.

When the load on the band of the safety belt is removed and the torque acting on the shaft disappears, the action of the elastic retaining plate 14 causes the pawl 12 to return to its original position shown in FIG.

In the event of a sudden change in the speed of the vehicle to which the device is installed (in order to actuate the locking device) (see Figures 3 and 4), the device has an inertial body 16, a retaining mechanism, 1
7 and, in the illustrated embodiment, a ratchet wheel 18 mounted on the shaft 2 of the handle 3.

In the illustrated embodiment, the inertial body 16, consisting of an upright pendulum, is enclosed within a frame 19, with a mounting provided with a seat 20 for the pendulum.
The seat 20 has an opening 21 through which the holding mechanism 17t can sense changes in the position of the pendulum.

The retaining mechanism 17 consists of a two-armed lever 22 which is mounted pivotably on an axle 23 in the frame 19 and extends through an opening 21 formed in the seat 20. The lever 22 has one end 24, and the one end 24 of the lever 22 is arranged so as to come into contact with a downward pointed needle 25 provided on the pendulum in its rest position.

The other end 26 of the lever 22 can be rotated into the housing 1 of the device by means of a shaft 28t (a second arm lever 27 supported on this shaft)
Ill in contact with.

One end 29 of the lever 27 is connected to one end 26 of the second lever 22, while the other end 30 of the lever 27 is arranged to engage with or disengage from the ratchet wheel 18.

The two levers 22.27 are biased toward each other by respective springs 31, 32, and these springs 31.3
2 urges the second lever 27 in the clockwise direction, and a spring 32 made of a helical spring that acts as a compression spring presses the second lever 27 together with the weight of the pendulum 16 acting on the second lever 22.
However, due to the tilting of the pendulum 16, the torque acting on the second lever 22 overcomes the torque acting on the second lever 27 in the opposite direction. It has been adjusted accordingly.

In the case of normal changes in speed of the vehicle in which the device is installed, the pendulum 16 is in its normal rest position and the retaining mechanism 17 is in a position out of engagement with the teeth 33 of the ratchet wheel 18 (see Figure 3). .

However, if a sudden change in the speed of the vehicle occurs, the pendulum 16
(see FIG. 4), whereby the first louver 22 rotates counterclockwise due to the bias of the spring 31 acting on it (see FIG.
The second lever 27 in contact with the reel 3 is rotated counterclockwise about the shaft 28 so that the other end 30 of the lever 27 engages with the teeth 33 of the ratchet wheel 18 and thus the reel 3 is locked against clockwise rotation.

When the sudden change in vehicle speed ceases and the safety belt band is unloaded, the pendulum 16 returns to its normal resting position shown in FIG. 3, thereby causing the two levers 22, 2γ is rotated again in the clockwise direction by the weight of the pendulum and the spring force acting on the lever 32, so that the end 30 of the lever 27 returns to its unlocked position shown in FIG. can rotate freely again.

As is clear from FIG. 5, when installing the pendulum 16 inside, the frame 19 is rotatable with respect to the housing 1 of the reel 3.
Different rotational positions can therefore be adjusted, so that the inertial body 16 can be held upright in different directions of the reel.

As is clear from FIGS. 3 and 4 and the descriptions associated with these figures, this is closely related to the retention mechanism arranged in the following manner.

The holding mechanism divides two main members, namely the levers 22 and 27, one of which is rotatably mounted within the frame 19 and the other lever 27 is disposed within the reel housing 1. Set up

These two members contact each other and the attachment transmits the movement of the inertial body 16 along the axis of rotation 34 of the frame 19.

The position of the end 29 of the lever 27, which allows a portion of the housing 1 to be rotatably mounted, is clear from FIG.

The rotatable mounting described above, depending on the structure of the frame 19 and the holding mechanism 17, allows the device to be mounted in different angular positions, for example at one point in Figure 5, where the reel housing shows two deformed positions at right angles to each other. The reel housing can be mounted in a position between the dashed and solid lines, but the mounting must not change the angular position of the frame 19 perpendicular to the longitudinal axis of the vehicle to which the device is mounted.

The present invention is not limited to the illustrated embodiments, but may be modified in various ways within the scope of the claims.

- Example 1 Accordingly, it is also possible to construct a reel locking system in a manner other than the illustrated embodiment.

The inertia can also be of other types, e.g. a ball,
The retention mechanism can also be configured in a variety of different ways.

Embodiments of the present invention are listed below.

(1) A housing having a rotatable reel around which a safety belt band is wound, a holding position where the reel is held against rotation in one direction, and an unlocking position where the reel is unlocked for rotation in both directions. The locking mechanism for the movable reel and the mounting for the inertial body that can rotate within an angular range of at least 90 degrees with respect to the housing are constructed from the frame, and the mounting is carried out on the frame. An inertial body capable of moving from a stop position to a displacement position in response to a sudden change in speed is supported, and the inertial body is supported by a pair of transmission members, one of which is mounted on the frame and the other mounted on the casing. The locking mechanism is connected, and the two transmission members are attached to the housing by contacting each other at a point on the axis of rotation of the frame, and when the inertial body moves from its stop position to a displacement position of 1, the transmission member is locked. A locking device for a safety belt for a vehicle, characterized in that two transmission members are biased by springs so as to react in reaction to move the mechanism to its holding position.

(2) One transmission member is constructed of a first arm lever rotatably mounted on a shaft on the frame, and the arm lever l
This is installed opposite to the casing by providing one end so as to sense changes in the position of the inertial body at a certain distance from the axis of rotation of the frame, and further detecting the movement of the inertial body along the axis of rotation (along which 2. The device according to claim 1, further comprising a second end for transmitting to the other attached transmitting member.

(3) When the inertial body is in its stop position and the locking mechanism is in the unlocked position, one end of the first arm lever is arranged so as to come into contact with the inertial body, and when the inertial body moves from the stopped position. (The device according to item 2 above, wherein the first arm lever is rotated to move the locking mechanism to the holding position.

(4) The other transmission member is composed of a second arm lever rotatably mounted on an axis within the housing, and one end of the arm lever is attached to the housing at a point on the rotational axis of the frame on the first arm. The other end of the second arm lever is brought into contact with the other end of the lever 22 and engaged with a ratchet ring on the reel to lock or unlock the reel 3 in response to movement of the inertial body. Or, the device according to item 2 or 3, characterized in that it is arranged so as to be detached from the ratchet ring.

(5) The two arm levers are provided with a pair of springs that bias each lever so that the other end of the first arm lever and one end of the second arm lever face each other and come into contact with each other.
When the inertial body is in its normal stop position, the second lever t
The torque applied to the second lever by the biasing spring and the weight of the inertia body overcomes the torque applied to the second lever by the spring biasing the second lever, but a sudden change in speed causes the inertia body to The third lever is characterized in that the two springs are arranged so that the torque applied to the second lever overcomes the torque applied to the second lever when the lever is moved.
Section 4 or Section 4 (Apparatus described herein.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view thereof, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a 1it-I Figure 4 is a partial cross-sectional view of the frame for the installation that encapsulates the inertial body, and Figure 5 is a schematic diagram showing the positions of the two installations. 1... Housing Body, 2...Rotation axis, 3...
...Reel, 16...Inertial body, 17...
...Retaining mechanism, 19... Rotatable mounting is frame,
22, 27... Lever 34... Rotation axis.

Claims (1)

[Claims] 1 A housing having a rotatable reel for wrapping a safety belt band, a locked position where the reel is held against rotation in one direction, and an unlocked position where the reel is unlocked for rotation in both directions. It consists of a locking mechanism that can move the opening and a frame for the inertial body that can rotate within an angular range of at least 90 degrees with respect to the housing. A pair of transmission members supporting an inertial body that can be moved from a stop position to a displacement position, one of which is disposed in a mounting frame and the other disposed in a housing (this connects the inertial body to the locking mechanism I, and A locking device for a safety belt for a vehicle, characterized in that the transmitting members are attached to the housing so that they contact each other at points on the axis of rotation of the frame, and are biased by respective springs.