JP2502512Y2 - Pre-wound spring spring unit - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a pre-wound spring spring unit,
In particular, the present invention relates to a vehicle safety belt device in which a take-up spring is housed in a case and wound to be united.

[Prior Art] Generally, a safety belt device in an automobile or the like winds a reel around which a webbing (seat belt) is wound around a take-up shaft that is rotationally biased by the force of a take-up spring. The take-up spring is usually a spiral spring, and as is well known, is a metal band-shaped elastic body, which is wound in a spiral shape to store energy, and its derotating force is used for rotational force. It is housed in a thin cylindrical case consisting of a case lid.

By the way, the take-up spring of the safety belt device must be set so that the webbing is always wound on the reel. Therefore, when the mainspring spring is assembled, it is necessary to wind the mainspring spring in advance to store energy (pre-winding). . Therefore, for the convenience of assembling the safety belt device, a mainspring spring unit is formed by prewinding the mainspring spring housed in the case, and the mainspring spring unit is finally assembled to the retractor (Japanese Patent Publication No. 58- 30065
Issue).

However, the problem with the mainspring unit is that it has been completed,
The detent of a simple structure is provided so that the stored force of the pre-wound spiral spring cannot be easily released (unwinding), but can be easily unwound only when assembly or the like is necessary. Therefore, according to the publication, a tubular body that engages with the retractor winding shaft is formed in the case body, and the inner end portion of the mainspring is locked to the tubular body while the tubular body is attached to the outside of the spring. By locking the end part to the case lid, fixing either one of the case body or the case lid and rotating the other to pre-wind the mainspring spring, and then fixing the case lid to the case body, When forming a spring detent and assembling it to the retractor, when the winding shaft is engaged with the tubular body and the winding shaft is strongly rotated in the winding direction or the unwinding direction of the mainspring, the tubular body is formed. Was to be separated from the case body.

[Problems to be Solved by the Invention] However, in the mainspring spring unit in the above publication, one of the case main body and the case lid is fixed and the other is rotated to prewind the mainspring spring. A special structure for connecting the case lid body and the case body, which has a delaminating force, is required because it requires a means for rotating and fixing the other side of the case, which complicates the pre-winding work process and raises the cost. Is required, which increases the manufacturing cost of the case. Furthermore, in the case of attaching to a retractor to take out the unwinding force, it is necessary to rotate the take-up shaft strongly to separate the tubular body from the case main body, which requires a separate work step and is troublesome. There is a risk that the separated tubular body may cause rotational resistance between itself and the case body, impairing smooth extraction of the unwinding force of the main spring.

Therefore, this invention has been made for the purpose of eliminating the drawbacks of the mainspring spring unit.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention corresponds to the convex portion projecting outward from the case body to form a shaft hole and the outer surface of the case body in the diametrical direction. A case body is formed in a diametrical direction on a shaft body in which a pair of cutout portions is formed and a projection is formed between the convex portion and the cutout portion provided on the outer side surface, and the inner end portion of the mainspring is locked to the shaft body. After forming a notch corresponding to the notch of the, the shaft body is fitted to the convex portion of the case body, after prewinding the mainspring,
A mainspring spring unit is constructed in which a pin having a hole that engages with a protrusion formed on the case body is passed through each of the notches to prevent the pin from being derotated.

[Operation] Since the present invention is configured as described above, after the unit is assembled and completed, the shaft body is appropriately rotated to wind and tighten the mainspring spring, and in that state, the pin is inserted into the cutout portion to prevent derotation. , Also, pull out the pin to unwind.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded view of an embodiment of this invention. As shown in the drawing, the mainspring spring unit includes a case body 1, a shaft body 2, a case lid body 3, pins 4 and 4, and a mainspring 5.

The case body 1 has a convex portion 20 in which a surface 6 lower than the general surface 19 is formed via a connecting surface 9, a shaft hole 7 bored in the central portion of the convex portion 20, and a diameter in the connecting surface 9. A pair of notches 10 and 10 formed to face each other in the direction, and the notches 10 and 10.
And a notch 8 formed in the outer surface 21 of the case body 1 so as to face each other in the radial direction. Also, on the back side of the general surface 19,
One projection 11, 11 is provided in the middle of the cutouts 8, 10, respectively.

The shaft body 2 has a flange portion 13 having an outer peripheral surface 12 at one end of a cylindrical body, and a notch portion 14 for mounting the spring spring 5.
And a bearing portion 15 into which the retractor winding shaft is inserted.
The outer peripheral surface 12 has notches 16 and 16 corresponding to the notches 10 and 10 of the case body 1.

The pin 4 has a neck portion 17 at both ends and a plurality of holes 18 at predetermined intervals in the middle portion. The hole 18 can be fitted into the protrusion 11 formed on the back surface of the case body 1.

That is, as shown in FIG. 3 and FIG. 4, the mainspring spring unit according to the present invention includes the case main body 1 and the case lid 3 that fits in the main case 1 and accommodates the mainspring spring 5, and the case main body 1. A shaft hole 7 bored in the center, a pair of notches 10 and 10 formed in the side surface of the shaft hole 7 so as to face each other in the diametrical direction, and a pair of notches corresponding to the notches 10 and 10. It has the parts 16 and 16 and is fitted into the shaft hole 7, and the spring spring 5
And a pin 4 which is inserted into the cutouts 10 and 16 from the outside of the case body 1 to reach the shaft body 2, respectively.

In order to assemble the respective parts having the above-mentioned configuration, the mainspring spring 5 is set inside the case lid body 3, and the shaft body 2 is placed at the center thereof.
Insert the case body 1, set the case body 1, and insert the pin 4 into the notches 8, 10 and 16 aligned in the radial direction, and insert the spring 5
Stop. At this time, the pins 4,4 do not fall off because the holes 18,18 engage with the projections 11,11. Then, the pins 4 and 4 are moved until the neck portions 17 and 17 come out of the cutout portions 16 and 16 and slightly pulled out, and the shaft body 2 is rotated by a rotating shaft that can be fitted into the bearing portion 15, so that the mainspring spring 5 is Give a prewind,
The pins 4 and 4 are again inserted into the notches 16 and 16 and returned to their original positions to complete the pre-winding.

In addition, as shown in FIG.
When assembled to the retractor body 22, the shaft body 2 is capped with the take-up shaft 23 of the retractor body, the pins 4 and 4 are extracted and unwound to rotate the take-up shaft 23, and engage with the take-up shaft 23. Reel 24
The webbing 25 is wound on.

[Effects of the Invention] According to the invention described above, the spring is pre-wound by inserting and removing the pin in the notches aligned in the radial direction to prevent the spring from unwinding, and further to rotate the case. Without rotating the shaft only for pre-winding work,
After pre-winding, just pull out the pin from the notch,
The work itself is simple and improves the manufacturing efficiency of the mainspring spring unit.

Since the shaft body is fitted in the convex portion of the case body, the shaft hole is blocked to prevent intrusion of dust, water, etc., and the pins are diametrically opposed to each other and inserted at equal lengths. Therefore, the center of the shaft is secured, the centering can be performed, and the assembling to the retractor becomes easy.

Further, since the pin penetrates the convex portion on the back surface of the case body, dust and water are prevented from entering from the case, which tends to occur in the conventional example in which the pin is inserted into the case lid.

Also, since the shaft body is free from the case body, and since the removal of the unwinding force is simply done by pulling out the pin from the case body, there is no work to cut off the shaft body part from the case body.
The present invention has an effect that a smooth unwinding force can be taken out without damaging the mainspring spring.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention, and FIG.
FIG. 3 is an exploded perspective view in which a part of the angle is changed, FIG. 3 is an overall sectional plan view of a completed state assembled to a retractor body, and FIG. 4 is a sectional side view. DESCRIPTION OF SYMBOLS 1 ... Case main body, 1 ... Shaft body, 3 ... Case lid body, 4 ... Pin, 5 ... Spring spring, 7 ... Shaft hole, 8 ... Notch part, 9 ... Connection surface, 10 ... Notch part, 11 ... Protrusion, 12 ... outer peripheral surface, 13 ... collar part,
14 ... Notch for mounting, 15 ... Bearing, 16 ... Notch,
17 ... neck part, 18 ... hole, 20 ... convex part

Claims (1)

(57) [Scope of utility model registration request] 1. A projection having an axial hole formed by projecting outward from the case body and a pair of notches corresponding to each other in the diametrical direction on the outer surface of the case body, and the projection and the outer surface. A protrusion is formed between the notches provided in the shaft body, and a notch portion corresponding to the notch portion of the case body in the diametrical direction is formed in the shaft body to which the inner end portion of the main spring is locked. After fitting the body into the convex portion of the case main body and pre-winding the mainspring spring, a pin having a hole for engaging with a protrusion formed in the case main body is passed through each of the notches. A pre-wound spiral spring unit characterized by being prevented from being unwound.