JP2024007914A - Wearable airbag device - Google Patents

Abstract

To provide a wearable airbag device capable of efficiently using inflation gas in a gas cylinder for inflation of an airbag.SOLUTION: A wearable airbag device 10 is worn by a protection object person, and when being actuated, inflates an airbag 60 by inflation gas G from a gas supply device 20 so as to protect a protection object part of the protection object person. The gas supply device comprises a gas cylinder 22 in which gas G is sealed, a cleavage pin 27, a gas generator 31 for moving the cleavage pin, and a holder 34. The holder includes a travel path 36 on which the cleavage pin can move, and holds the gas cylinder and the gas generator at both ends of the travel path, with their tip surfaces 24a and 31a facing each other. The travel path includes a gas supply path 43 branching to the airbag side. The cleavage pin includes a tip 29 projecting in a tapered manner from a base 28. An opening part 37 of the gas supply path is disposed at such a position as to be closed by the cleavage pin until a start of cleavage and to allow the gas G to flow in, after the cleavage.SELECTED DRAWING: Figure 7

Description

The present invention relates to a wearable airbag device that is worn by a person to be protected and protects the part of the person to be protected by the inflated portion of the inflated airbag when the person falls.

Conventionally, wearable airbag devices have been configured to inflate the airbag by allowing inflation gas from a gas supply device to flow in so as to protect the body part of the person to be protected (for example, Patent Document (see 1). The gas supply device includes a gas cylinder filled with an inflation gas such as carbon dioxide, a cleavage pin that cleaves the tip of the gas cylinder to discharge the inflation gas, and a moving gas that moves the cleavage pin from the tip when ignited. It was configured to include an electrically ignited gas generator for discharging gas, and a holder that holds the gas cylinder, cleavage pin, and gas generator and is attached to the inflating gas inflow site of the airbag. The holder has a movement path through which the cleavage pin can be moved, and is arranged at both ends of the movement path so that the front end surface of the gas cylinder and the front end surface of the gas generator face each other, so that the gas cylinder and the gas generator can be connected to each other. was held. A gas supply path for supplying inflation gas discharged from the gas cylinder to the airbag side was branched off from this movement path. When the gas supply device is activated, the gas generator is ignited and the moving gas is discharged from the gas generator, and the cleavage pin moves along the moving path due to the pressing force of the moving gas and hits the tip surface of the gas cylinder. By cleaving the tip surface, inflation gas is discharged from the gas cylinder, and the inflation gas is supplied to the airbag side through a gas supply path branching from the travel path, and the airbag is filled with the inflation gas. was allowed to flow in to inflate the inflatable part that protects the part of the person to be protected.

Japanese Patent Application Publication No. 2015-62545

However, in conventional wearable airbag devices, the cleavage pin has a disc-shaped base part with an outer diameter approximately equal to the distal end surface of the gas generator, and a shaft with a smaller diameter than the base part that protrudes from the base part toward the gas cylinder side. and a tapered arrowhead-shaped tip at the tip of the shaft. Therefore, when the tip of the cleavage pin cleaves the tip of the gas cylinder and discharges the inflation gas during operation, the inflation gas is discharged into the movement path, and the gas opened in the movement path Although it was supplied from the supply path to the airbag side, it also filled the area around the shaft. In other words, the inflation gas discharged from the distal end surface of the gas cylinder is not smoothly supplied to the airbag side, and does not flow toward the airbag side around the shaft of the rupture pin on the inner peripheral side of the movement path. Some of the gas was wasted, and the expansion gas in the gas cylinder could not be used efficiently. The gas cylinder of the wearable airbag device is worn by the person being protected, and is preferably small and lightweight. Therefore, the inflation gas in the small and lightweight gas cylinder can be used to efficiently inflate the airbag. It is desirable to use it for

The present invention solves the above-mentioned problems, and aims to provide a wearable airbag device that can efficiently use inflation gas in a gas cylinder to inflate an airbag.

The wearable airbag device according to the present invention is installed on a person to be protected, and when activated, the airbag is inflated with inflation gas from a gas supply device so as to protect the body part of the person to be protected. Along with being configured,
The gas supply device includes:
A gas cylinder filled with inflation gas,
a cleavage pin that cleaves the distal end surface of the gas cylinder to discharge the inflation gas;
an electrically ignited gas generator that discharges a moving gas for moving the cleavage pin from its tip when ignited;
a holder that holds the gas cylinder, the cleavage pin, and the gas generator and is attached to an inflow portion of the inflation gas of the airbag;
A wearable airbag device comprising:
The holder is
The cleavage pin has a movement path through which the cleavage pin can be moved, and a front end surface of the gas cylinder and a front end surface of the gas generator are arranged at both ends of the movement path so as to face each other, so that the gas cylinder and the gas generator and furthermore,
a gas supply path branching from the movement path and supplying the inflation gas to the airbag side;
The cleavage pin is
A columnar base portion having an outer shape equivalent to the opening shape of the movement path, and a tip portion protruding from the base portion in a tapered shape,
The distal end portion is separated from the distal end surface of the gas cylinder and the end surface side of the base portion is disposed on the distal end surface side of the gas generator as an initial position,
An opening portion of the gas supply path in the movement path is
The gas generator side is closed by the cleavage pin until the distal end face of the gas cylinder starts to cleave, and after cleavage, the inflation gas from the gas cylinder flows in without the gas cylinder side being closed by the cleavage pin. in a position that allows
It is characterized by being located.

In the wearable airbag device according to the present invention, when the gas generator is ignited during operation and the moving gas is discharged from the distal end surface of the gas generator, the cleavage pin moves the end surface of the base side toward the moving gas. The inflation gas in the gas cylinder moves from the front end of the gas cylinder as the tapered tip is pushed into the front end of the gas cylinder and splits the front end of the gas cylinder. The gas is discharged to the roadside and further supplied to the airbag from a gas supply path opened to the travel path. At this time, the cleavage pin is arranged in the form of a tapered column that is inserted into the movement path, and the inflation gas discharged from the gas cylinder pushes the cleavage pin back slightly toward the gas generator. The gas does not go around the outer circumferential side of the cleavage pin or the end face away from the tip of the base part, but only fills the gas cylinder side of the travel path blocked by the cleavage pin itself, smoothly and quickly without waste. The inflation gas in the gas cylinder can be efficiently supplied to the airbag by flowing toward the gas supply path side. Of course, the opening part of the gas supply path in the moving path is closed on the gas generator side by the tearing pin until the tip of the gas cylinder starts to be opened by the tearing pin during movement. The gas can press the cleavage pin accurately without leaking to the gas supply path until the cleavage pin starts to cleave, and after the rupture pin is returned to the pressing force of the inflation gas, the cleavage pin releases the gas. Since the gas cylinder side of the opening of the supply path is opened without being closed, the inflation gas from the gas cylinder smoothly flows from the opening of the gas supply path to the airbag side.

Therefore, in the wearable airbag device according to the present invention, the inflation gas in the gas cylinder can be used efficiently to inflate the airbag. Further, since the inflation gas in the gas cylinder can be used to inflate the airbag without wasting it, it is possible to use a lightweight and small gas cylinder suitable for the wearable airbag device.

In the wearable airbag device according to the present invention, the gas supply path is communicated with a position on the gas cylinder side from an intermediate portion between the distal end surfaces of the gas cylinder and the gas generator in the movement path. It is desirable to be present.

With such a configuration, when the inflation gas is discharged from the gas cylinder, the inflation gas can be quickly supplied to the airbag side because the gas supply path is close to the gas cylinder side.

Further, in the wearable airbag device according to the present invention, the cleavage pin adjusts the height of the distal end from the base of the distal end surface of the gas cylinder in the movement path and the gas cylinder side of the gas supply path. It is desirable that the distance be set larger than the distance between the edge and the edge.

In such a configuration, when the tip of the cleavage pin is placed in a position where it comes into contact with the tip surface of the gas cylinder, the portion of the tapered inclined surface on the gas supply path side extends from the tip surface of the gas cylinder. , it is located on the gas supply path side beyond the edge of the gas cylinder side of the gas supply path. Therefore, for example, when the tip of the cleavage pin is pushed back by the pressure of the inflation gas after being pushed to cleave the front end of the gas cylinder, the tip of the cleavage pin is at least at the position immediately before it cleaves the front end of the gas cylinder. When the cleavage pin returns a short distance, the part of the cleavage pin on the gas supply path side at the intersecting edge of the base and tip is placed within the opening part of the gas supply path, and the inflation gas is immediately supplied. It can be supplied to the airbag side via a channel. That is, when the inflation gas is discharged from the gas cylinder, if the cleavage pin is slightly pushed back, the inflation gas can be quickly and stably supplied to the airbag side.

1 is a schematic front view and a schematic back view of a wearable airbag device according to an embodiment of the present invention. FIG. FIG. 2 is a rear view showing the airbag when the wearable airbag device according to the embodiment is activated. FIG. 3 is an enlarged rear view of the vicinity of the gas supply device of the wearable airbag device according to the embodiment. FIG. 1 is a schematic perspective view of a gas supply device according to an embodiment. 4 is a schematic cross-sectional view of the gas supply device of the embodiment, corresponding to the section VV in FIG. 3. FIG. 4 is a schematic cross-sectional view of the gas supply device of the embodiment, corresponding to the section VI-VI in FIG. 3. FIG. FIG. 2 is a schematic enlarged sectional view showing the vicinity of the cleavage pin when the gas supply device of the embodiment is in operation. FIG. 2 is a perspective view of the gas supply device of the embodiment as seen from the inside of the airbag.

Hereinafter, an embodiment of the present invention will be described based on the drawings. As shown in FIG. 1, a wearable airbag device 10 of the embodiment is attached to a person to be protected 1 and activated when the person to be protected 1 falls. , during operation, the inflation gas G (see B in FIG. 7) from the gas supply device 20 is used to protect the femoral trochanteric region 3 (L, R) of the person to be protected 1. The bag 60 is configured to be inflated. The wearable airbag device 10 of the embodiment includes a gas supply device 20, an airbag 60, an operation control device 17 that includes a sensor section 18 that detects a fall of the person to be protected 1 and operates the gas supply device 20, and a gas supply device 17 that operates the gas supply device 20. It is configured to include a supply device 20, an airbag 60, and a vest-type holder 11 that holds an operation control device 17.

The holding body 11 is configured as a vest that can be worn on the upper body 1a of the person to be protected, and includes a left front part 12 and a right front part 13 that cover the front of the upper body 1a of the person to be protected. It is configured to include a back surface portion 14 that covers the back surface of the device, and further includes a fastener 16 such as a fastener that connects the inner edges 12a, 13a of the left front portion 12 and right front portion 13 to each other. In other words, the holder 11 has the left front part 12 disposed in a row in front of the left part 14b of the back part 14, and the right front part 13 in front of the right part 14c of the back part 14. They are arranged and configured so that they are connected.

The operation control device 17 includes a sensor unit 18 that includes an angular velocity sensor capable of detecting angular velocity around three axes (up, down, front, back, left and right) and an acceleration sensor capable of detecting acceleration in three axes (up, down, front, back, left and right). In addition, the gas supply device 20 is configured to be activated when it is detected by a signal from the sensor section 18 that the person to be protected 1 is performing a falling motion that is different from the normal motion. Specifically, the operation control device 17 uses a determination means that can determine from various threshold values that the person to be protected 1 has started a falling motion that is different from the normal motion, based on the signal from the sensor section 18. In preparation, based on the determination by the determination means, it is detected that the person to be protected 1 has fallen, and the gas supply device 20 is activated. The operation control device 17 also has a built-in power source such as a battery (not shown) for operating the sensor section 18 and outputting signals for operating the gas supply device 20.

The operation control device 17 is attached to the lower part 14d of the inner surface of the right side 14c of the back surface 14 of the holder 11, covered with a cover cloth (not shown) so as not to come into contact with the clothes of the person to be protected 1. It is being

As shown in FIGS. 1 to 6, the gas supply device 20 includes a gas cylinder 22, a cleavage pin 27, an electrically ignited gas generator 31, and a holder 34. It is attached to the lower part 14d side of the inner surface of the central part 14a. The holder 34 holds the gas cylinder 22, the cleavage pin 27, and the gas generator 31, and is attached to the inflow site of the inflation gas G (see B in FIG. 7) of the airbag 60.

The gas cylinder 22 is configured by enclosing an inflation gas G made of carbon dioxide or the like in a metal bottle such as aluminum, and includes a cylindrical body part 23 and a small diameter cylindrical part at the tip of the body part 23. When the partition wall 24b (see FIG. 7) on the distal end surface 24a of the distal end portion 24 is torn by the tearing pin 27, the enclosed inflation gas G is released. It is configured to discharge from the tip surface 24a. The distal end portion 24 constitutes an attachment portion 25 that is attached to an attachment portion 39 of the holder 34, and in the case of the embodiment, the attachment portions 25 and 39 have a screw structure that screws into each other. That is, the mounting portion 25 on the distal end portion 24 side is provided with a male thread, and the mounting portion 39 on the holder 34 side is provided with a female thread corresponding to the mounting portion 25.

The gas generator 31 discharges a moving gas R (see B in FIG. 7) from its tip for moving the tearing pin 27 when ignited, and uses a squib of an inflator used in a general-purpose airbag device. It is an electrically ignited type consisting of a fuse and gunpowder that is ignited by the fuse. During operation, the combustion gas of the gunpowder ignited by the fuse ruptures the partition wall 31b of the tip surface 31a (see A and B in FIG. 7), and is discharged from the tip surface 31a to move the cleavage pin 27. It is used as a moving gas R. The distal end portion of the gas generator 31 constitutes a mounting portion 32 that is attached to a mounting portion 40 of a holder 34, and in the case of the embodiment, the mounting portions 32 and 40 have a threaded structure that screws into each other. That is, the mounting portion 32 on the gas generator 31 side is provided with a male thread, and the mounting portion 40 on the holder 34 side is provided with a female thread corresponding to the mounting portion 32.

The cleavage pin 27 is made of metal such as steel, and has a cylindrical base part 28 having an outer shape similar to the opening shape of a moving path 36, which will be described later, of the holder 34, and a tapered conical shape protruding from the base part 28. (See FIGS. 5 and 6). In the initial position before the gas supply device 20 is activated, the cleavage pin 27 brings the end surface 28b of the base portion 28 into contact with the distal end surface 31a of the gas generator 31 (see A in FIG. 7).

The holder 34 is integrally molded from a synthetic resin such as polypropylene, and includes a substantially cylindrical holder main body 35 and brim portions 45, 45 projecting from the holder main body 35 in a brim shape on both sides (both upper and lower sides). It is configured.

The through hole 35a passing through the approximately cylindrical holder main body 35 has a circular opening having the same external shape as the base portion 28 of the tearing pin 27, with the center portion serving as a movement path 36 for slidably housing the tearing pin 27. It is structured as a shape. Both ends of the through-hole 35a are mounted so that the gas cylinder 22 and the gas generator 31 are held so that the distal end surface 24a of the gas cylinder 22 and the distal end surface 31a of the gas generator 31 are opposed to each other. Sections 39 and 40. As described above, each of the attachment parts 39 and 40 is threaded with a female thread corresponding to the attachment parts 25 and 32 of the gas cylinder 22 and the gas generator 31. The moving path 36 has a circular opening shape with a smaller diameter than the inner diameter of the attachment parts 39 and 40, that is, the outer diameter of the tip surfaces 24a and 31a of the gas cylinder 22 and the gas generator 31.

Further, a gas supply path 43 is opened in the movement path 36 of the holder main body 35 and is branched to supply the inflation gas G from the gas cylinder 22 to the airbag 60 side. The gas supply path 43 has an opening diameter smaller than that of the movement path 36 and is arranged perpendicularly to the movement path 36 .

The opening portion 37 of the gas supply path 43 in the moving path 36 is closed on the gas generator 31 side by the tearing pin 27 until the tearing pin 27 starts tearing the distal end surface 24a of the gas cylinder 22 during movement. It is arranged at a position that allows the inflation gas G from the gas cylinder 22 to flow in without the gas cylinder 22 side being closed by the tearing pin 27 later.

Specifically, the opening portion 37 of the gas supply path 43 communicates with a position closer to the gas cylinder 22 than an intermediate portion C1 between the distal end surfaces 24a and 31a of the gas cylinder 22 and the gas generator 31 in the moving path 36. ing.

Furthermore, the opening portion 37 of the gas supply path 43 allows the distance L2 between the distal end surface 24a of the gas cylinder 22 in the moving path 36 and the edge 37b on the gas cylinder 22 side of the opening portion 37 to It is arranged at a position that is smaller than the height dimension H1 from the portion 28 (L2<H1, see A in FIG. 7).

In addition, the length H0 from the end surface 28b of the base portion 28 to the top 29a of the tip portion 29 of the cleavage pin 27 is the distance between the tip surface 24a of the gas cylinder 22 and the edge 37a of the opening portion 37 on the gas generator 31 side. (H0>L1).

In the case of the embodiment, the inner diameter D0 of the moving path 36 is approximately 6 mm, the inner diameter D1 of the gas supply path 43 is approximately 3 to 4 mm, the length H0 of the tear pin 27 is approximately 5 mm, and the length H0 of the tear pin 27 is approximately 5 mm. The height dimension H1 of the tip portion 24 is approximately 2 mm, and the distance L1 from the tip surface 24a of the gas cylinder 22 to the edge 37a on the gas generator 31 side at the opening portion 37 of the gas supply path 43 is approximately 4.5 mm. The distance L2 from the tip end surface 24a of the gas cylinder 22 to the edge 37b on the gas cylinder 22 side of the opening portion 37 of the gas supply path 43 is approximately 1.5 mm.

Further, two mounting holes 45a are provided in the flanges 45 on both sides of the holder main body 35 of the holder 34, through which mounting bolts 47 for mounting the holder 34 to the airbag 60 are passed. The holder 34 is attached to the airbag 60 in cooperation with an inner plate 50 disposed on the inner peripheral surface side of the airbag 60.

The inner plate 50 is a substantially rectangular plate made of sheet metal such as steel, and has a circulation port 51 in the center through which the inflation gas G passes, and mounting holes 50a through which the mounting bolts 47 pass through are arranged near the four corners. ing. The inner plate 50 is disposed at the periphery of an inlet 62 (described later) on the inner circumferential surface side of the airbag 60, and includes each attachment hole 50a of the inner plate 50, each attachment hole 63 (described later) of the airbag 60, and a flange portion. The holder 34 can be attached to the airbag 60 by passing the attachment bolts 47 through each of the attachment holes 45 a and tightening the nuts 48 to each attachment bolt 47 .

The airbag 60 is formed by sewing or bag weaving from a woven fabric such as polyester or polyamide into a bag shape that is inflated by allowing inflation gas G to flow between an outer wall portion 60b and an inner wall portion 60c. ing. The airbag 60 is configured such that inflation parts 66 and 67 extending in the vertical direction are arranged on both left and right sides (see FIGS. 1 and 2). These inflation parts 66 and 67 serve as lower back protection parts that protect the left and right femoral trochanteric parts 3 (L, R) of the lower back part 2 of the person to be protected 1, and when the airbag 60 completes inflation, It extends back and forth centering on the left and right side surfaces 2a of the waist region 2 of the person to be protected 1, and is arranged so as to cover the periphery of the femoral trochanteric region 3 (L, R). When the airbag 60 is fully inflated, the left and right waist protection parts 66 and 67 are inflated into a substantially rectangular plate shape, and the upper edges 66a and 67a of the left and right waist protection parts 66 and 67 are inflated by communicating with each other. The communication section 64 is configured to include a communication section 64. The communication part 64 is disposed at the center of the airbag 60 between the left and right waist protection parts 66, 67 when inflated, and is arranged so that the lower edges 66b, 67b of the waist protection parts 66, 67 are raised. In addition, the waist protection parts 66 and 67 have a narrower width in the vertical direction than the waist protection parts 66 and 67. An inlet 62 through which the inflation gas G flows is opened in the outer wall 60b of the communication portion 64, and a mounting hole 63 through which each mounting bolt 47 passes is formed around the inlet 62. .

The airbag 60 is provided with a plurality of mounting tabs 60a on the upper edges 66a and 67a of the waist protection parts 66 and 67, and these mounting tabs 60a are attached to the inside of the holder 11 by sewing or the like. It is attached to the side surface and held by the holding body 11.

Furthermore, in the state before the wearable airbag device 10 is activated, the airbag 60 has the lower edges 66b, 67b of the lower back protectors 66, 67 close to the upper edges 66a, 67a, and the lower edges 66, It is folded so as to be inserted into the holder 67 and held by the holder 11.

Note that the gas supply device 20 is configured such that the holder 34 is attached to the outer wall 60b of the airbag 60 together with the inner plate 50 using mounting bolts 47 and nuts 48, and the inner wall 60c and the outer After the airbag 60 is formed into a bag shape by joining the outer peripheral edges with the wall portion 60b, the attachment portions 25 and 32 are attached to the attachment portions 39 and 40 of the holder 34 attached to the airbag 60. , can be formed by attaching the gas cylinder 22 and the gas generator 31. Note that the cleavage pin 27 is attached to the distal end surface 31 a of the gas generator 31 and is inserted into the moving path 36 when the gas generator 31 is attached to the holder 34 . Then, the airbag 60 with the gas supply device 20 attached is attached to the holder 11 by folding the lower edges 66b, 67b closer to the upper edges 66a, 67a and using the attachment tabs 60a. By connecting the lead wire 19 for inputting an operation signal from the operation control device 17 attached to the holder 11 to the gas supply device 20, the holder 11 can hold the airbag 60, the gas supply device 20, etc. A wearable airbag device 10 can be manufactured.

In the wearable airbag device 10 of the embodiment, the holder 11 is attached to the upper body 1a of the person to be protected 1 using the fastener 16, and then when the person to be protected 1 falls, etc., a signal from the sensor unit 18 is emitted. The operation control device 17 that has been inputting this operates the gas supply device 20. Then, when the inflation gas G from the gas supply device 20 flows into the airbag 60 through the inlet 62 (see A and B in FIG. 7), the waist protection parts 66 and 67 as the respective inflation parts are inflated. Thus, it is possible to cover and protect the femoral trochanteric portion 3 (L, R), which is the part to be protected, of the person to be protected 1 who falls down (see the two-dot chain line in FIG. 1).

In the wearable airbag device 10 of the embodiment, when the gas generator 31 is ignited during operation and the moving gas R is discharged from the distal end surface 31a of the gas generator 31, the states A and B in FIG. As shown, the cleavage pin 27 moves along the movement path 36 with the end surface 28b on the base 28 side pushed by the moving gas R, and pushes the tapered tip 29 into the tip surface 24a of the gas cylinder 22. , the distal end surface 24a of the gas cylinder 22 is split, so that the inflation gas G in the gas cylinder 22 is discharged from the distal end surface 24a of the gas cylinder 22 toward the moving path 36, as shown in FIGS. , is supplied to the airbag 60 from a gas supply path 43 that is open to the movement path 36. At this time, the cleavage pin 27 is disposed in a tapered cylindrical shape so as to be fitted into the movement path 36, and the inflation gas G discharged from the gas cylinder 22 causes the cleavage pin 27 to slightly generate gas. Although the gas cylinder 22 is pushed back toward the container 31 side, it does not go around to the outer peripheral surface 28a side of the tearing pin 27 or the end surface 28b side away from the tip 29 of the base part 28, and the gas cylinder 22 in the movement path 36 is blocked by the tearing pin 27 itself. By simply filling the gas cylinder 22, the inflation gas G in the gas cylinder 22 can be efficiently supplied to the airbag 60 because it flows smoothly and quickly to the gas supply path 43 side without waste. Of course, the opening portion 37 of the gas supply path 43 in the moving path 36 is closed on the gas generator XXXI side by the tearing pin 27 until the tearing pin 27 starts tearing the distal end surface 24a of the gas cylinder 22 during movement. The moving gas R discharged from the generator 31 can accurately press the tearing pin 27 without leaking to the gas supply path 43 side until the tearing pin 27 starts to tear, and after the tearing pin 27 starts to tear, the inflation gas G Since the cleavage pin 27 opens the gas cylinder 22 side of the opening part 37 of the gas supply path 43 without closing it, the inflation gas G from the gas cylinder 22 is smoothly released. Then, the gas flows from the opening portion 37 of the gas supply path 43 to the airbag 60 side.

Therefore, in the wearable airbag device 10 of the embodiment, the inflation gas G in the gas cylinder 22 can be used efficiently to inflate the airbag 60. Furthermore, since the inflation gas G in the gas cylinder 22 can be used to inflate the airbag 60 without waste, it is possible to use a lightweight and small gas cylinder 22 suitable for the wearable airbag device 10.

Further, in the wearable airbag device 10 of the embodiment, the gas supply path 43 is located at a position closer to the gas cylinder 22 than the intermediate portion C1 between the distal end surfaces 24a and 31a of the gas cylinder 22 and the gas generator 31 in the movement path 36. is communicated with.

Therefore, in the embodiment, when the inflation gas G is discharged from the gas cylinder 22, the inflation gas G can be quickly supplied to the airbag 60 side because the gas supply path 43 is close to the gas cylinder 22 side.

Furthermore, in the wearable airbag device 10 of the embodiment, the tearing pin 27 changes the height dimension H1 of the distal end portion 29 from the base portion 28 between the distal end surface 24a of the gas cylinder 22 in the movement path 36 and the gas cylinder 22 in the gas supply path 43. The distance L2 to the side edge 37b is set larger than the distance L2 (L2<H1).

Therefore, in the embodiment, as shown in FIG. A gas supply path 43 in which a portion 29bb of the inclined surface (tapered surface) 29b on the gas supply path 43 side extends from the distal end surface 24a side of the gas cylinder 22 and exceeds the edge 37b side of the gas cylinder 22 side of the gas supply path 43. It will be located on the side. Therefore, for example, when the distal end 29 of the cleavage pin 27 is pushed back by the pressure of the inflation gas G after being pushed so as to cleave the distal end surface 24a of the gas cylinder 22, at least the distal end 29 of the cleavage pin 27 When the surface 24a returns a short distance L3 to the position immediately before being cleaved, the gas supply path 43 side portion 29cb of the edge 29c of the cleavage pin 27 where the base portion 28 and the tip portion 29 intersect is connected to the gas supply path 43. The inflation gas G can be immediately supplied to the airbag 60 side through the gas supply path 43. That is, when the inflation gas G is discharged from the gas cylinder 22, if the tearing pin 27 is pushed back slightly, the inflation gas G can be quickly and stably supplied to the airbag 60 side.

Of course, the height H1 of the distal end portion 29 protruding from the base portion 28 is set to be larger than the distance L2 from the distal end surface 24a of the gas cylinder 22 in the movement path 36 to the edge 37b of the opening portion 37 on the gas cylinder 22 side, for example, If the dimension is equal to or greater than the distance L1 from the distal end surface 24a of the gas cylinder 22 to the vicinity of the edge 37a on the gas generator 31 side of the opening portion 37, the cleavage pin 27 will be pushed into the distal end surface 24a of the gas cylinder 22. Even in the closed state, the inflation gas G in the gas cylinder 22 can be supplied to the airbag 60 side through the gas supply path 43.

Further, in order to easily supply the inflation gas G to the airbag 60 side via the gas supply path 43, a tapered surface 29b of the distal end portion 29 of the tearing pin 27 is provided on the edge 29c side from the top portion 29a to the base portion 28 side. A concave groove for guiding the inflation gas G may also be provided.

Further, in the embodiment, a vest type holding body 11 for holding the airbag 60 and the like is illustrated, but a jacket type holding body having sleeves may be used, or a belt type holding body may be used.

1... Person to be protected, 3 (L, R)... (part to be protected) femoral trochanter, 10... Worn airbag device, 20... Gas supply device, 22... Gas cylinder, 24a... Tip surface, 27... Tearing pin , 28... base part, 29... tip part, 31... gas generator, 31a... tip surface, 34... holder, 36... movement path, 37... (gas supply path) opening part, 37a... (gas generator side) edge , 37b... (gas cylinder side) edge, 43... gas supply path, 60... air bag,
H0... Length dimension (of the cleavage pin), H1... Height dimension (of the tip), L2... Distance (from the gas cylinder tip surface to the cylinder side edge), C1... Intermediate portion (between the tip surfaces), R... Gas for movement, G...Gas for expansion.

Claims (3)

The airbag is configured to be attached to a person to be protected and to inflate the airbag with inflation gas from a gas supply device so as to protect the body part of the person to be protected when activated.
The gas supply device includes:
A gas cylinder filled with inflation gas,
a cleavage pin that cleaves the distal end surface of the gas cylinder to discharge the inflation gas;
an electrically ignited gas generator that discharges a moving gas for moving the cleavage pin from its tip when ignited;
a holder that holds the gas cylinder, the cleavage pin, and the gas generator and is attached to an inflow portion of the inflation gas of the airbag;
A wearable airbag device comprising:
The holder is
The cleavage pin has a movement path through which the cleavage pin can be moved, and a front end surface of the gas cylinder and a front end surface of the gas generator are arranged at both ends of the movement path so as to face each other, so that the gas cylinder and the gas generator and furthermore,
a gas supply path branching from the movement path and supplying the inflation gas to the airbag side;
The cleavage pin is
A columnar base portion having an outer shape equivalent to the opening shape of the movement path, and a tip portion protruding from the base portion in a tapered shape,
The distal end portion is separated from the distal end surface of the gas cylinder and the end surface side of the base portion is disposed on the distal end surface side of the gas generator as an initial position,
An opening portion of the gas supply path in the movement path is
The gas generator side is closed by the cleavage pin until the distal end face of the gas cylinder starts to cleave, and after cleavage, the inflation gas from the gas cylinder flows in without the gas cylinder side being closed by the cleavage pin. in a position that allows
A wearable airbag device characterized in that: The gas supply path is
The wearable airbag device according to claim 1, wherein the airbag device is connected to a position on the gas cylinder side from an intermediate portion between the distal end surfaces of the gas cylinder and the gas generator in the movement path. The cleavage pin is
The height dimension of the tip part from the base part is set to be larger than the distance between the tip surface of the gas cylinder in the movement path and the edge of the gas cylinder side of the gas supply path. The wearable airbag device according to claim 1 or 2.

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