JPH0347954Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a safety belt retractor.

[Technical background of the invention and its problems] A safety belt retractor installed on the seat of a vehicle, etc., stores the belt wound around the shaft when the safety belt is not in use, and when the safety belt is not in use, the belt is wound around the shaft. The belt can be pulled out freely and is automatically wound up when the passenger releases the belt.To achieve this function, a return spring is connected to the shaft that winds the belt. There is. By the way, when installing this return spring, it is necessary to apply a biasing force to the spring while the belt is in the retracted state.
In advance, on the main assembly line of the belt winding device, a worker installs a cup-shaped spring cover attached to the side plate of the winding device main body, and the inner peripheral end is placed on the shaft around which the belt is wound, and the outer peripheral end is is tightened by a predetermined amount through the rotation of the shaft to apply a biasing force to the shaft in a predetermined belt winding direction, and then the shaft is maintained in its biased state. It was assembled by connecting one end of the belt and then winding the extended safety belt according to the biasing force of the return spring.

Such a process poses a problem in that it takes time to wind the return spring, which significantly reduces work efficiency on the main assembly line.

[Purpose of the invention] The present invention was made in view of the above-mentioned circumstances, and the means for easily accumulating and retaining the winding and biasing force of the return spring for winding the belt is separated from the main body of the winding device and made independent. It is an object of the present invention to provide a safety belt winding device that improves work efficiency on a main assembly line by providing it as a device.

[Summary of the invention] In order to achieve the above object, the present invention includes a spring cover with a bottom that locks and stores one end of a return spring in a sub-assembly line, and a spring cover that is inserted through the open end of the spring cover to remove the return spring. A safety belt winding device comprising a cylindrical bush which locks one end and has a fitting hole into which the tip of a shaft for winding the safety belt is fitted, wherein at least two bushes are arranged on the cylindrical peripheral edge of the bush. A circular insertion hole is provided on the bottom surface of the spring cover, and a plurality of notches are provided on the circumferential surface of the insertion hole, while a groove for engagement of the bush is provided on one end surface of the plate-shaped part. at least two that engage
A locking member is provided with a plurality of engagement protrusions and a plurality of engagement pieces that can be engaged with a notch provided on the bottom surface of the spring cover, and the button is attached to the return spring by locking the bush to the return spring. The locking member is inserted into the circular insertion hole of the spring cover while applying force, and the engagement protrusion of the locking member is engaged with the engagement groove of the bush, and the engagement piece is inserted into the circular insertion hole. It is characterized in that it is attached so as to engage with the inner wall surface of a notch provided in the insertion hole.

[Examples of the invention] The invention will be specifically explained below using examples.

FIG. 1 is an exploded perspective view of essential parts of an embodiment of the device of the present invention, and FIG. 2 is an assembled sectional view of the same. In the same figure, 1 is a return spring having an external locking piece 1A and an internal locking piece 1B, and 2 is a bottomed spring having a recess for accommodating the return spring 1 and a mounting flange 2A on the peripheral edge of the opening. This is a spring cover, and 3 is a plate having an insertion hole 3A for inserting a bush which will be described later.With the return spring 1 stored in the bottomed spring cover 2, the spring cover 2 is inserted so as to close the opening. Ready to be installed. Reference numeral 4 denotes a cylindrical bush in which a fitting groove is provided along the axial direction into which the tip protrusion 5A of the shaft 5 that winds the belt is fitted. is a locking groove 4 that engages the internal locking piece 1B of the return spring 1.
A pair of engagement grooves B, 4B and rectangular engaging grooves 4D, 4E are each provided axially symmetrically. A locking member insertion hole 6 having an inner diameter approximately equal to the diameter of the bush 4 is provided on the bottom surface 2B of the spring cover 2, and a plurality of locking member insertion holes (6 or 8) semicircular notches 6
A is provided. When this spring is viewed from the front, the clockwise direction Y is the belt winding direction, and the counterclockwise direction X is the belt pulling direction.

Reference numeral 7 denotes a locking member for locking the return spring 1 while retaining its biasing force, and includes a circular plate-shaped portion 7A and a grip portion 7B provided on one surface of the plate-shaped portion 7A. A pair of engagement protrusions 7D, 7E and a plurality of engagement pieces 8 are provided on the other surface of the plate-shaped portion 7A. The positional relationship between these engaging protrusions and engaging pieces is as shown in the rear view of FIG. 3. That is, the pair of engagement protrusions 7D and 7E fit into the rectangular engagement groove 4 of the bush 4.
Circumferential line L so as to engage with D and 4E, respectively.
The plurality of engaging pieces 8 are arranged oppositely on the top.
They are arranged at approximately equal intervals on a circumferential line M that can be inserted into the semicircular notch 6A of the locking member insertion hole 6 provided on the bottom surface of the spring cover 2. In addition, the tip of each engagement piece 8 is provided with a belt winding direction Y.
A tapered surface 8B and an engaging claw 8A are provided. Note that the engaging protrusions 7D and 7E protrude slightly longer than the engaging piece 8.

To assemble such a device, the return spring 1 is housed in the spring cover 2, the external locking piece 1A of the return spring 1 is hooked to a locking part (not shown) in the spring cover 2, and then the plate 3 is is attached so as to close the opening of the spring cover 2, the bush 4 is inserted into the insertion hole 3A provided in the plate 3, and the internal locking piece 1B of the spring 1 is locked in the locking groove 4B of the bush 4. Thereafter, a suitable jig is inserted into the fitting groove 4F of the bush 4 and rotated in the belt pulling-out direction to apply an urging force to the return spring 1 in the belt winding direction. In this state, hold the gripping part 7B of the locking member 7 and insert it through the insertion hole 6 provided in the spring cover 2, so that the engaging protrusions 7D, 7E are inserted into the engaging grooves 4D, 4E of the bush 4.
so that it engages. At this time, the plurality of engaging pieces 8 provided on the locking member 7 are also inserted into the spring cover 2 through the plurality of notches 6A in the locking member insertion hole 6 provided in the spring cover 2. Therefore, when the jig used for rotating the bush 4 is removed in this state, the end engaging claws 8A of the plurality of engaging pieces 8 provided on the locking member 7 are disposed on the bottom surface of the spring cover 2. Notch 6A of insertion hole 6
Since the return spring is engaged with the inner wall surface in the belt winding direction, the installation of the sub-assembly line is completed while the biasing force of the return spring is maintained. In this state, the winding device is transported to the main assembly line, and after the spring cover 2 is attached to, for example, the side plate 11 of the belt winding device body, the shaft 5 is moved so that the safety belt 10 is wound in the belt winding direction. By inserting the rectangular tip 5A into the fitting groove 4F of the bush 4, the device as shown in FIG. 2 is assembled. After that, if the locking member 7 is removed, the desired winding force will be applied to the safety belt 10. To remove this locking member 7, it is sufficient to hold the grip portion 7B and rotate it in the direction of belt withdrawal. In this way, the tapered surface 8B of the engagement piece 8 slides as a guide, allowing smooth removal. After removing the locking member 7, a suitably shaped lid may be attached to the insertion hole 6. Note that 9 is a ratchet plate attached to the shaft 5.

In the embodiment described above, the number of notches provided in the locking member insertion hole 6 was 6 to 8, but the number may be greater or less than that. Moreover, the shape is not limited to a semicircular shape. When changing the number and shape of the notches in this way, the locking member 7
The locking piece must also be changed accordingly.
Furthermore, it goes without saying that the shape and number of the engagement protrusions and the engagement grooves provided on the bushing may be changed as appropriate.

[Effects of the invention] According to the invention described in detail above, it is extremely easy to maintain the winding and biasing force of the return spring on the sub-assembly line.
It is possible to provide a safety belt retractor that can improve the efficiency of assembling the retractor on a main assembly line.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of an embodiment of the device of the present invention, FIG. 2 is an assembled sectional view thereof, and FIG. 3 is a rear view of a locking member used therein. 1...Return spring, 2...Spring cover, 3...Plate, 4...Button, 4B
...Latching groove, 4D, 4E...Engagement groove, 5...
Shaft, 6... Locking member insertion hole, 6A... Notch, 7... Locking member, 7A... Plate-shaped portion, 7B...
Grip portion, 7D, 7E...Engagement protrusion, 8...Engagement piece, 8A...Engagement claw, 10...Safety belt, 11
...Side plate.

Claims (1)

[Claims for Utility Model Registration] (1) A bottomed spring cover that locks and stores one end of the return spring, and a safety belt that is inserted through the open end of the spring cover and locks one end of the return spring. A safety belt winding device comprising: a cylindrical bush having a fitting hole into which a tip of a shaft wound with the bushing is fitted; A circular insertion hole is provided on the bottom surface of the spring cover, and a plurality of notches are provided on the circumferential surface of the insertion hole, while at least two engagement grooves are provided on one end surface of the plate-shaped portion to engage with the engagement grooves of the bush. A locking member having a plurality of engaging pieces that can be engaged with a projection and a notch provided on the bottom surface of the spring cover is provided, and the bush is locked with the return spring to apply a biasing force to the return spring. In this state, the locking member is inserted into the circular insertion hole of the spring cover, the engagement protrusion of the locking member is engaged with the engagement groove of the bush, and the engagement piece is provided in the circular insertion hole. A safety belt retractor characterized in that the safety belt retractor is installed so as to engage with an inner wall surface of a cutout. (2) The safety belt winding device according to claim 1, wherein the engaging piece has a tapered surface that projects along the belt winding direction.