JPH0472740B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an automatic seatbelt attachment/detachment method for an automobile in which the seatbelt is automatically put on when a person is seated in the seat, and automatically taken off when getting out of the vehicle. The present invention relates to a method of forming an end portion of a drive cable in a device.

Problems to be Solved by the Prior Art and the Invention This type of automatic seatbelt attachment/detachment device allows a drive cable to freely slide into a guide tube having an axial open groove disposed along a door opening of an automobile body. a connector and a cam, the proximal end of which is inserted into the drive cable and connected to a drive drum installed at the lower end of the rear part of the door opening, and the drive cable has a protrusion that protrudes outward through the open groove of the guide tube at the distal end of the drive cable; spaced apart from each other, and attach the connector to the protruding part of the connector.
The leading end of the seat belt that is unwound from the seat belt retractor attached to the seat is connected to the seat belt, and a connecting device that is activated by engagement with the protruding part of the cam is attached to the inner edge of the rear part of the door opening on the guide tube. When a person sits on the seat, the drive drum winds up the drive cable, causing the tip of the seatbelt to travel toward the rear of the door opening and reach the coupling device. At this time, the coupling device connects with the cam. The distal end of the seat belt is irremovably connected to this coupling device by the engagement of the cam, and when the driver gets out of the vehicle, the drive drum sends out the drive cable and the coupling device is engaged with the cam. The connection of the seatbelt tip is released and the seatbelt tip travels to the front of the door opening and waits, but it takes a long time to attach the connector and cam to the drive cable tip.
Conventionally, a connector and a cam are fitted inside two metal fittings that are caulked to the tip of the cable at a predetermined distance from each other, and a number of sliding rings are placed between them at appropriate intervals adjacent to each other. The part of the drive cable between the connector and the cam should be fitted with sufficient play so that the part between the connector and the cam of the drive cable bends freely when running through the bent part at the corner of the door opening of the guide tube, and prevents buckling due to push load. However, it is difficult to ensure the dimensional accuracy of each sliding ring fitted between the connector and the cam, resulting in variations in the amount of play in the axial direction. If the drive cable is small, the drive cable between the connector and the cam can only be bent with a large radius of curvature, and therefore it will be forced to bend at the bent part of the guide tube, resulting in excessive sliding resistance, and vice versa. If the amount of play is too large, the drive cable will bend due to the action of the push load, and the distance between the connector and the cam will change greatly between the action of the push load and the action of the pull load. Operation becomes uncertain, resulting in failure to connect or release the connection between the tip of the seatbelt and the coupling device.Furthermore, it takes time and effort to fit the sliding ring between the connector and the cam. This has the disadvantage of poor work efficiency and high costs.

Means for Solving the Problems As a means for solving the above-mentioned problems, the present invention provides that after fixing metal fittings by caulking to the outer periphery of the drive cable corresponding to the connector and cam at the tip end of the drive cable, and a presser pin having a molded hole for each sliding ring and pressing down the metal fittings from both sides, and a slight gap around the outer periphery of the drive cable at mutually adjacent portions of the connector, cam, and each sliding ring. The connector, the cam, and each sliding ring are integrally formed at the tip of the drive cable by fitting the drive cable into a mold having a support ring for supporting the drive cable, and press-fitting a molten synthetic resin into the mold. did.

Effects and Effects According to the method for forming the end portion of the drive cable in the automatic seat belt attachment/detaching device for a vehicle of the present invention, the connector, the cam, and each sliding ring are integrally formed at the tip portion of the drive cable. The assembly work can be done quickly, and the distance between the connector and the cam has high dimensional accuracy and there is no variation between products.
To hold the tip of the drive cable in the mold,
The metal fittings fixed to the drive cable are held down by the holding pin, and the outer periphery of the driving cable between the two fittings is supported by each support ring with a small gap, so that the drive cable does not touch the holding pin or the support ring. This has the effect of preventing the wire from breaking due to pressure.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

FIG. 1 shows the structure of the terminal portion of a drive cable 1 according to the present invention. The cable 2 is covered with a synthetic resin 3, and a predetermined length of the synthetic resin 3 at the terminal end is cut off to expose the cable 2, and the exposed cable 2 is coated in two places, one near the tip and one near the rear end. A ring-shaped metal fitting 5 is fixed by caulking, a connector 6 is fixed around the metal fitting 5 on the front side, and a cam 7 is fixed around the metal fitting 5 on the rear side. , respectively, a sliding part 1 sliding in a guide tube 9 having an axial open groove 8 shown in chain lines in FIG.
Connecting portions 12 and cam portions 14 projecting outward through open grooves 8 are formed on the connectors 6 and 11, respectively. Sliding rings 15 are fixed at equal intervals between adjacent parts, the connector 6, and the cam 7, and each sliding ring 15 has a shape in which the outer periphery of the front and rear ends of a short cylinder is tapered. There is.

Next, a method of forming the terminal portion of the drive cable 1 having the above structure will be explained with reference to FIGS. 3 to 6.

As described above, after cutting off the synthetic resin 3 at the end of the drive cable 1 and fixing the metal fitting 5 to the exposed wire 2, the exposed portion of the cable 2 is placed in the molds 16, 16 which are divided into two parts. These molds 16, 16 are fitted and cast.
is the connector 6, cam 7 and each sliding ring 1 described above.
Forming holes 6a, 7a and 15a of No. 5 are formed respectively, and the inner circumferential edges of the partition walls at mutually adjacent portions of these forming holes correspond to the outer circumference of the wire 2 with a slight gap of 0.1 mm or less, as shown in FIG. As shown, it serves as a support ring 17 that supports the wire 2 immovably in the radial direction, and the molded holes 6a of the connector 6 and the cam 7,
Holding pins 6b and 7b are formed on the inner surface of 7a to press down the metal fittings 5 and 5 from both sides, respectively.
After fitting the wire 2 into one mold 16 with the metal fittings 5, 5 corresponding to the holding pins 6b, 7b, and tightening the wire 2 with the other mold 16, the mold is inserted from the injection port (not shown) of the mold 16. By press-fitting the molten synthetic resin into the holes 6a and 16, each molding hole 6a,
7a and 15a are filled with synthetic resin, both ends of the wire 2 are held down by holding pins 6b and 7b via metal fittings 5, and the outer periphery of the wire 2 is held down by support rings 17 at the center. Because it is supported, the axis is prevented from shifting due to the pressure of the synthetic resin being press-fitted, and this allows
sliding parts 10 and 11 of the connector 6 and the cam 7, respectively;
And each sliding ring 15 is formed concentrically around the wire 2.

In this embodiment, in order to hold the wire 2 in the mold 16, the metal fittings 5, 5 fixed near both ends of the wire 2 are held down by holding pins 6b, 7b, respectively, and the outer periphery of the wire 2 is held in the middle part. Since the wires are supported by each support ring 17 with a small gap, the wire 2 is prevented from breaking due to being pressed by the presser pins 6b, 7b or the support ring 17.

In addition, FIG. 7 shows a sliding ring 27 which is a modification of the sliding ring 17 of the above-mentioned embodiment, and has a shape in which the outer circumferential line at both ends of a short cylinder is further shaved off. If the outer diameter of each strand 4 constituting the wire 2 of 1 is small, the gap formed between each strand 4 and the support ring 17 becomes small, and the flow of the press-fitted synthetic resin becomes poor. In such a case, the inner diameter of each support ring 17 of the mold 16 may be slightly increased to leave a gap of about 0.1 to 0.3 mm between it and the outer circumference of the wire 2. As shown in FIG. 9 and FIG. 9, a thin film of synthetic resin is formed on the outer periphery of the wire 2 at adjacent portions of adjacent sliding rings 17 or adjacent sliding rings 27.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the end portion of a drive cable formed by the method of the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a method of forming the end portion of the drive cable. FIG. 4 is a sectional view taken along the line B-B in FIG. 3, FIG. 5 is a perspective view of the mold, FIG. 6 is an enlarged sectional view of a part of FIG. 1, and FIG. 8 is a cross-sectional view of a modified example of the sliding ring, and FIGS. 8 and 9 are partial cross-sectional views when the support ring 17 is molded so that its inner diameter is larger than the outer diameter of the wire. 1... Drive cable, 5... Metal fitting, 6... Connector, 7... Cam, 8... Open groove, 9... Guide tube, 15... Sliding ring, 16... Mold, 17, 27
... Support ring, 6a, 7a, 15a ... Molding hole, 6
b, 7b...presser pin.

Claims (1)

[Claims] 1. A drive drum in which the base end of a drive table is slidably inserted into a guide tube having an axial open groove arranged along the inner edge of a door opening of an automobile body, and the base end of the drive table is installed at the lower end of the rear part of the door opening. a connector and a cam connected to the drive drum so that the drive cable runs in both directions by being fed out and wound up by the drive drum; and are attached at a predetermined interval from each other, and several sliding rings that slide in the guide tube are fitted between the connector and the cam at small intervals adjacent to each other, and the protrusion of the connector is connecting the front end of the seat belt unwound from a seat belt retractor attached to the seat to the seat belt, and causing the front end of the seat belt to travel toward the rear of the door opening by winding the drive drum; In the automatic seatbelt attaching/detaching device for an automobile, wherein a coupling device attached near the guide tube is activated by engagement with the protrusion of the cam to couple the distal end of the seat belt to the coupling device. After fixing metal fittings by caulking to the outer periphery of the tip of the drive cable corresponding to the connector and the cam, a molded hole is provided for the connector, the cam, and each sliding ring, and both the metal fittings are pressed from both sides, respectively. A synthetic resin that is fitted into a mold and has a support ring that supports the outer periphery of the drive cable with a slight gap between the presser pin and the mutually adjacent parts of the connector, cam, and each sliding ring, and is melted in the mold. 1. A method of forming an end portion of a drive cable in an automatic seat belt attaching/detaching device for an automobile, characterized in that the connector, the cam, and each sliding ring are integrally formed at the tip portion of the drive cable by press-fitting.