JPH0232526Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a webbing length adjustment device for a seat belt of an automobile or the like. In general, the webbing length adjustment device is often provided integrally with the buckle or tongue, or may be provided in the middle of the webbing, but is often covered with a plastic casing for aesthetic reasons. In addition, the length adjustment device has a long hole drilled in the center of the bottom plate, an adjustment bar installed on the long hole so as to be able to slide back and forth, and the webbing passed through the long hole from below. It is designed to be wound from the front to the rear, passed through the elongated hole again, and pulled out downward. A spring is interposed between the side end of the adjustment bar and the inner surface of the front end of the casing, the spring biases the adjustment bar rearward, and the webbing is sandwiched between the adjustment bar and the rear edge of the elongated hole. Pressure is used to prevent the webbing from slipping. However, in this type of length adjusting device, the casing may crack when a large impact is applied due to an accident or the like, or when the length adjusting device is inadvertently caught in a door.
If the casing breaks, it can no longer support the spring, and the force that biases the adjustment bar backwards is lost, causing the webbing to slip inadvertently. That is, when an accident or the like occurs and the length adjusting device is supposed to hold the webbing firmly and support the tension, the function of the length adjusting device deteriorates, which is extremely dangerous.

The present invention was devised in view of the above circumstances, and it is an object of the present invention to provide a length adjusting device that can function satisfactorily without causing the spring to come off even if the casing is damaged.

Therefore, the present invention provides a length adjustment device for a seat belt covered with a plastic casing, in which a long hole is bored in the center of the bottom plate, and
Upright pieces are provided on both sides of the front part of the bottom plate, and an adjustment bar is installed on the elongated hole so as to be slidable back and forth, and the adjustment bar is biased rearward by the elasticity of a spring supported by the upright piece, and the webbing is A long hole is passed through the bottom plate from below, and the adjustment bar is wound from the front through the upper part to the rear, and then passed through the long hole again from behind the adjustment bar and pulled out downward.

The drawings show one embodiment of the present invention,
A frame 1 has side walls 3 raised on both sides of a bottom plate 2, and horizontal portions 4 bent in a direction toward each other are formed at the upper ends of the side walls 3. Bottom plate 2
A long hole 5 is bored in the center of the tongue, and a tongue piece 7 having a locking hole 6 is protruded from the front end. An adjustment bar 8 is installed over the elongated hole 5, and both ends of the adjustment bar 8 are fitted between the bottom plate 2 and the horizontal portion 4 so as to be able to slide back and forth. Further, an auxiliary bar 9 is provided in front of the adjustment bar 8 in parallel with the adjustment bar 8, and is also configured to be able to slide back and forth.
Notches 10 are formed at both ends of this auxiliary bar. Reference numeral 11 denotes a sub-plate, the central rear end of which is bent downward to form a bent piece 12, which is secured to the front edge of the elongated hole 5. Further, on both sides of the front edge of the sub-plate 11, upright pieces 13 are formed that are bent upward. A helical spring 14 is interposed between the upright piece 13 and the notch 10 of the auxiliary bar 9 to bias the auxiliary bar 9 in a direction toward the adjustment bar 8. . Also sub plate 1
Extensions 19 extending rearward are formed on both sides of the extension 1, and the rear end of the extension 19 is concave upward to form a bent piece 20. A casing 15 is composed of two parts 15a and 15b, which are combined to cover the outside of the frame 1. A hole 16 matching the long hole 5 is formed in the bottom surface, and a tongue piece 7 projects from a slit 17 at the front end.

The webbing 18 passes through the hole 16 and the elongated hole 5, passes between the adjustment bar 8 and the auxiliary bar 9, is pulled out upward, is wound over the adjustment bar 8 from front to back, and is again passed through the elongated hole 5. and is pulled out downward through the hole 16.

In the present invention, the adjustment bar 8 is biased rearward by the elasticity of the spring 14, and the webbing 18 is sandwiched between the adjustment bar 8 and the rear edge of the elongated hole 5, so that no force is applied to the webbing 18. This prevents you from accidentally slipping when you do something. Moreover, spring 14
Since the front end of the casing 15 is supported by the upright piece 13, even if the casing 15 is damaged due to an accident or the length adjustment device is caught in the door, the above function will not be affected in any way and the system is extremely safe. It is.

In the previous embodiment, the upright piece 13 of the present invention is provided on a sub-plate that is a separate part from the frame 1, but it may also be formed by bending and raising the front end of the bottom plate 2, side wall 3, or horizontal part 4. In short, it only needs to be integrated with the frame 1 or fixedly supported with respect to the frame 1. Further, in the embodiment, since the bending piece 20 is provided, even if the adjustment bar 8 moves excessively backward due to an impact or the like, it is possible to prevent the adjustment bar 8 from falling off from the frame 1.

In the present invention, the spring 14 may be directly interposed between the upright piece 13 and the adjustment bar 8, but as in the embodiment, an auxiliary bar 9 is provided, and the auxiliary bar 9 and the upright piece 13 A spring 14 is interposed between the auxiliary bar 9 and the webbing 1 interposed between the auxiliary bar 9 and the adjustment bar 8 due to the elasticity of the spring 14.
By biasing the adjustment bar 8 backward through the adjustment bar 8 and the auxiliary bar 9, the webbing 18 is constantly clamped between the adjustment bar 8 and the auxiliary bar 9, and tension is intermittently applied to the webbing 18, so that the webbing 18 is It is possible to prevent the so-called micro-slip phenomenon in which the length 18 slips little by little, resulting in a safer length adjustment device.

The length adjusting device of the present invention is not limited to being provided integrally with the tongue of the buckle as shown in the embodiment, but may also be provided integrally with the buckle body, or by sewing webbing to the front end of the frame. It is also possible to use it as an intermediate adjuster.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
FIG. 1 is a central vertical sectional view, and FIG. 2 is a partially cutaway perspective view. 2... Bottom plate, 5... Long hole, 8... Retainer,
9... Beam, 11... Sub plate, 12...
Bending piece, 13... Standing piece, 14... Spring.

Claims (1)

[Claims for Utility Model Registration] 1. A length adjustment device for a seat belt covered with a plastic casing, which comprises a long hole in the center of the bottom plate and upright pieces on both sides of the front of the bottom plate, An adjustment bar is installed on the elongated hole so as to be slidable back and forth, and the webbing is passed through the elongated hole from below the bottom plate, and is wound from the front of the adjustment bar through the upper part to the rear. A hole is passed through the hole and pulled downward, an auxiliary bar parallel to the adjustment bar is provided in front of the adjustment bar so as to be slidable back and forth, and a spring is interposed between the auxiliary bar and the upright piece. A webbing length adjusting device for a seat belt, characterized in that the webbing is compressed between an auxiliary bar and an adjustment bar by the elasticity of a spring, and the adjustment bar is biased rearward via the auxiliary bar and the webbing. 2. Placing a sub-plate on the bottom plate in front of the elongated hole, forming a downwardly bent bent piece on the rear edge of the sub-plate, and locking the bent piece to the front edge of the elongated hole; The seat belt webbing length adjusting device according to claim 1, wherein the upright pieces are formed by bending upward on both sides of the front edge of the sub-plate.