JP2559498B2 - Re-tightening method for safety belt device and its device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a safety belt device mounted on a vehicle or the like to protect an occupant from a collision accident, and particularly to detect a collision and explode an explosive powder with an electric signal. The present invention relates to a method for re-tightening a safety belt device for instantaneously winding up a slack of a webbing and restraining a webbing wearer on a seat and the device.

[Prior Art] In order to protect an occupant in a vehicle or the like from a collision accident,
A safety belt device for restraining an occupant to a seat operates a gas generator through a detection means which detects an impact of a vehicle body and emits an ignition signal (current), and winds and winds a winding shaft by the gas pressure. A device provided with a re-tightening device is provided (see, for example, JP-A-57-128169).

As shown in FIG. 5 and FIG. 6, this re-tightening device is mainly a mechanical structure attached to a so-called retractor, and has a pulley 21 attached to a winding shaft 20 of a retractor 19.
The cord 22 is loosely wound around, the piston 23 is connected to one end of the cord 22, the piston 23 is fitted and inserted into the cylinder 24, the other end is a free end, and the gas generator 25 is attached to the cylinder 24. Installed so that they can communicate with each other, the gas generator 25 has a built-in explosive powder 26 and an electric ignition part (squib) 27 that explodes the explosive powder. The ignition part 27 detects an impact attached to the entire vehicle body and emits an ignition signal. It is connected to the vehicle power source 30 through the means 28 and the harness (wiring) 29, and when the detection means 28 is activated, the explosive powder 26 explodes and moves the piston 23 in the cylinder 24, and the piston 23 moves tow it. The cord 22 is instantly wound around the winding shaft 20 wound around the pulley 21, and the webbing 31 worn by the occupant is wound up, and at the same time as the collision, the webbing 31 is removed. It is said that the occupant is restrained to the seat Than it is.

[Problems to be Solved by the Invention] However, according to the above-described conventional safety belt device,
Since the detection means, the vehicle power supply and the re-tightening device are connected in series, as long as the ignition switch is turned on, when the safety belt device is not used, that is, there is no seated person in the seat, and Even if the webbing is not pulled out, if the vehicle body receives an impact and the detection means detects it, the re-tightening device may operate, resulting in waste of the gas generator.

Therefore, the present invention has been made for the purpose of reliably preventing useless operation of the gas generator in the re-tightening device of the safety belt device.

[Means for Solving the Problems] In order to solve the above problems, the present invention inputs an ignition signal generated by a detection unit that senses an impact into a gas generator equipped with an explosive, and the explosive is ignited to generate a gas. In a method of re-tightening a safety belt device in which the pressure inside the container is increased and the take-up shaft of the webbing is taken up and rotated by the pressure, the detection means detects the impact of the vehicle body near the body of the safety belt device. , The ignition signal is input to the gas generator only when the seated person is present in the seat and the webbing is installed through the means for respectively detecting and installing the webbing and detecting whether or not the seat is seated. The re-tightening method of the safety belt device is configured by the above.

Further, the webbing for gas pressure in the gas generator includes a detection unit that detects an impact of a vehicle body due to a collision and emits an ignition signal, and a gas generator that includes explosive powder that explodes with the ignition signal of the detection unit. In the re-tightening device for the safety belt device that winds and rotates the take-up shaft, the detecting means is fixed to the safety belt device body, and the ignition circuit electrically connecting the detecting means and the vehicle power source is connected to the webbing. A buckle switch for detecting the presence or absence of wearing, a webbing pull-out detection switch for detecting the pulling out of the webbing, and a seat occupancy detection switch for detecting the presence or absence of a seat are all connected in series. The re-tightening device was constructed.

[Operation] According to the present invention having the above-described configuration, when the detection means detects an impact during a vehicle collision, whether a seated person is in the seat, the webbing is pulled out, or the tongue of the webbing is inserted into the buckle. If all of the conditions are met, a signal is sent to the gas generator of the re-tightening device and the explosive explodes, filling the gas pressure in the gas generator and converting that force into rotation of the winding shaft. With this mechanism, the take-up shaft of the safety belt device is instantly taken up and rotated, the sagging of the webbing is taken up, and the occupant is forcibly restrained to the seat.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. According to the method of the present invention, an ignition signal generated by a detection means that senses an impact is input to a gas generator equipped with an explosive, the explosive is ignited to increase the pressure in the gas generator, and the webbing pressure is increased by the pressure. In the method for re-tightening a safety belt device in which a winding shaft is wound and rotated, the detection means detects an impact of the vehicle body near the safety belt device body, and the ignition signal is used to pull out and install the webbing. The means for detecting whether or not the seat is seated is such that the gas is input to the gas generator only when the seated person is present and the webbing is mounted. Therefore, the ignition circuit of the re-tightening device will be described below to replace the description of the method.

FIG. 1 shows a first embodiment of the ignition circuit.
1 is an ignition switch, 2 is a sensor which is a detecting means, 3 is a squib which is an ignition part, 4 is a buckle switch 5 which detects attachment of webbing, a seating detection switch 6 which detects whether or not a seated person is present in the seat, and The detection switch is a webbing pull-out detection switch 7 that detects whether or not the webbing is pulled out from the safety belt device body, and these are connected in series. RV indicates the vehicle power supply, and GND indicates ground. The sensor 2 is fixed to a housing 16 (see FIGS. 6 and 7) of the safety belt device body 15 described later.

Therefore, in this embodiment, even if the ignition switch 1 is turned on and the sensor 2 is closed, if the buckle switch 5, the seat seating detection device 6 and the webbing pull-out detection switch 7 are not closed, the squib 3 generates heat. No, the re-tightening device will not work.

Explaining a safety belt device with a re-tightening device to which the above ignition circuit is applied, as shown in FIG. 2 and FIG.
Housing 16 for safety belt device body (retractor) 15
A sensor 2, which is a detecting means, is fixed to a vehicle body mounting bracket 17 integrally connected with the support bracket 18 via a support bracket 18. As shown in FIG. 4, the support bracket 18 is composed of a mounting portion 18a connected to the bracket 17 by welding or the like and a U-shaped holder portion 18b for sandwiching and fixing the sensor 2. A re-tensioning device 19 is attached to the safety belt device body 15.

The re-tightening device 19 is a gas generator 40 containing a gunpowder and a squib, and a cylinder connected in communication with the gas generator 40.
It consists of 41 and the cylinder 41 has a tapered upper end,
A piston (not shown) is movably inserted into the cylinder 41, and one end of a loosely wound cord is connected to a pulley (not shown) of the retractor 15 of the retractor 15 and the like. The webbing and its take-up spool are omitted in the figure. Further, the configuration of the re-tightening device 19 may be the same as that of the conventional example, and the detailed configuration thereof is arbitrary.

[Effects of the Invention] According to the invention described above, the safety belt device with the re-tightening device is provided with the detection means for detecting the impact of the vehicle body and emitting the ignition signal in the main body, and is there a seated person in the seat? Since the re-tightening device is activated only when the webbing is pulled out or the tongue of the webbing is inserted in the buckle, the re-tightening device is activated, which prevents unnecessary operation of the gas generator. Target.

[Brief description of drawings]

1 is an ignition circuit configuration diagram of a re-tightening device showing an embodiment of the present invention, FIG. 2 is a partially omitted front view of a safety belt device with a re-tightening device according to the present invention, and FIG. 3 is a side view thereof. Fourth
The drawing is a partial perspective view thereof, FIG. 5 is a side view showing a conventional safety belt device with a re-tightening device, and FIG. 6 is a sectional view taken along line XX of FIG. 1 ... Ignition switch, 2 ... Sensor (detection means), 3 ... Ignition part (squib), 4 ... Detection switch, 5 ... Buckle switch, 6 ... Seat sitting detection switch, 7 ... Webbing pull-out detection Switch, 15 ...
… Safety belt device body (retractor), 19 …… Retightening device, 40 …… Gas generator.

Claims (2)

(57) [Claims] Claim: What is claimed is: 1. An ignition signal generated by a detection means that senses an impact is input to a gas generator equipped with an explosive, the explosive is ignited to increase the pressure in the gas generator, and the webbing is wound at the pressure. In the re-tightening method of the safety belt device in which the shaft is wound and rotated, the detection means detects the impact of the vehicle body in the vicinity of the safety belt device main body, and the ignition signal is the pulling-out and mounting of the webbing and the seat The re-tightening of the safety belt device is characterized in that the gas is input to the gas generator only when the seated person is seated and the webbing is attached through the means for detecting the presence or absence of each seat. Method. 2. A gas in the gas generator, which has a detecting means for detecting an impact of a vehicle body caused by a collision and for emitting an ignition signal, and a gas generator equipped with explosive powder which explodes by the ignition signal of the detecting means. In a re-tightening device of a safety belt device that winds and rotates a webbing take-up shaft by pressure, the detection means is fixed to a safety belt device body, and an ignition circuit electrically connecting the detection means and a vehicle power source is provided. , A safety featured by connecting in series a buckle switch for detecting whether or not the webbing is mounted, a webbing pull-out detection switch for detecting the pulling-out of the webbing, and a seat occupancy detection switch for detecting the presence / absence of a seat. Belt device re-tightening device.