Seat belt installation and removal detection switch

Abstract

A seatbelt attachment and detachment detection switch comprises: a printed circuit board containing a circuit for detecting attachment and detachment of the seatbelt; a rotor rotatably mounted on the printed circuit board, including a contact portion that contacts a locking tongue of the seatbelt and rotating in a forward direction as the locking tongue is inserted into a buckle; a spring that causes the rotor, which is rotating in a forward direction, to rotate in a reverse direction as the locking tongue is removed from the buckle; and a brush mounted on a surface of the rotor opposite to the printed circuit board, having a foot portion that changes its state of contact with or non-contact with a conductive portion of the circuit depending on the rotational state of the rotor.

Description

Technical Field

[0001] The invention relates to a safety belt assembly and disassembly detection switch. Background Art

[0002] As a conventional technology of a seat belt buckle switch, there is Patent Document 1, for example.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2016-159723

[0004] The seat belt buckle switch of patent document 1 comprises: a substrate, which is arranged inside the buckle; an electrode area, which is formed on the substrate; a slider, which is mounted on the substrate in a manner that can slide on the substrate and slides in conjunction with the loading and unloading action of the tongue plate; a movable terminal, which has one or more conductive feet, which extend in the sliding direction of the slider and contact the substrate or the electrode area, so that the slider can slide on the substrate and be in either a contact or non-contact state relative to the electrode area; a guide portion, which is formed by providing one or more step portions on the substrate, the step portions extending continuously or intermittently along at least a portion of the electrode area, and guiding the movable terminal through the step portions when the slider slides. Summary of the Invention

[0005] Since the seatbelt buckle switch of Patent Document 1 moves in the same direction as the tongue plate, a switch with the same moving range as the tongue plate needs to be used, resulting in a problem of increasing the size of the switch.

[0006] Therefore, an object of the present invention is to provide a small seat belt attachment and detachment detection switch.

[0007] The seat belt installation and removal detection switch of the present invention comprises a printed circuit board, a rotor, a spring, and a brush.

[0008] The printed circuit board contains circuitry for detecting seatbelt attachment and detachment. A rotor is rotatably mounted on the printed circuit board and includes a contact portion that contacts the seatbelt tongue. Insertion of the tongue into the buckle causes the rotor to rotate in the forward direction. A spring causes the rotor, which is rotating in the forward direction, to rotate in the reverse direction as the tongue is removed from the buckle. A brush is mounted on the surface of the rotor facing the printed circuit board and has legs that change their contact / non-contact state with the conductive portion of the circuit board depending on the rotor's rotational state.

[0009] Can be used as a small seat belt installation and removal detection switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is an exploded perspective view of the seat belt installation and removal detection switch.

[0011] Figure 2 It is a first perspective view of the seat belt installation and removal detection switch.

[0012] Figure 3 This is a first perspective view of the printed circuit board with the seat belt attachment and detachment detection switch removed.

[0013] Figure 4 It is a second perspective view of the seat belt installation and removal detection switch.

[0014] Figure 5 This is a top view of the seat belt installation and removal detection switch in its initial state.

[0015] Figure 6 This is a top view of the seat belt attachment and detachment detection switch in the forward-rotated state. DETAILED DESCRIPTION

[0016] Hereinafter, embodiments of the present invention will be described in detail. Components having the same functions are denoted by the same reference numerals and repeated descriptions are omitted.

[0017] Example 1

[0018] Below, refer to Figure 1 The structure of the seatbelt attachment and detachment detection switch of Example 1 will be described. As shown in the figure, the seatbelt attachment and detachment detection switch 1 of this embodiment includes a printed circuit board 11 , a rotor 12 , a torsion coil spring 13 , and a brush 14 .

[0019] The printed circuit board 11 includes a first circuit 111, a second circuit 112, a hole 113, a slit 114, a first groove 115, a second groove 116, and a recess 117. The rotor 12 includes a contact portion 121, a shaft 122, a claw 123, a first protrusion 124, and a second protrusion 125. The torsion coil spring 13 includes an end 131, an end 132, a bent portion 133, and a coil 134. The brush 14 includes a first leg 141 and a second leg 142.

[0020] like Figure 2 As shown, the rotor 12 is rotatably mounted on the printed circuit board 11. Specifically, the rotor 12 includes a shaft 122 extending toward the printed circuit board 11. The printed circuit board 11 includes a hole 113 into which the shaft 122 fits. Thus, the rotor 12 is rotatable about the shaft 122.

[0021] The rotor 12 includes a contact portion 121 that contacts the tongue of the seat belt, and rotates in the forward direction (the direction of the white outline arrow in the figure) as the tongue is inserted into the buckle.

[0022] Furthermore, the rotor 12 includes claws 126 that extend toward the printed circuit board 11 and protrude in a direction different from the direction of extension. The printed circuit board 11 includes arc-shaped slits 114 through which the claws 126 are inserted. Since the tips of the claws 126 protrude, they engage with the slits 114, preventing the rotor 12 from floating or falling off.

[0023] Likewise, the rotor 12 includes claws 123 extending toward the printed circuit board 11 and protruding in a direction different from the extending direction. The tips of the claws 123 engage with arc-shaped areas of the printed circuit board 11 to prevent the rotor 12 from floating or falling off.

[0024] The rotor 12 includes a first protrusion 124 for limiting forward rotation and a second protrusion 125 for limiting reverse rotation. The printed circuit board 11 includes: a first groove 115, which is engaged with the first protrusion 124 when the rotor 12 is at a preset limit angle for forward rotation; a second groove 116, which is engaged with the second protrusion 125 when the rotor 12 is at a preset limit angle for reverse rotation; and a circular arc shape is cut between the first groove 115 and the second groove 116.

[0025] like Figure 3 As shown, the torsion coil spring 13 causes the rotor 12, which is rotating in the forward direction, to rotate in the reverse direction as the tongue is pulled out of the buckle, thereby returning the rotor 12 to its initial state. The coil 134 of the torsion coil spring 13 is inserted through the shaft 122, and the end 131 of the torsion coil spring 13 is fixed to the groove 128 of the rotor 12 (see also FIG. Figure 4 ), the other end portion 132 of the torsion coil spring 13 is fixed to the recess 117 of the printed circuit board 11 (see also Figure 2 ).

[0026] like Figure 3 As shown, brush 14 is mounted on the surface of rotor 12 facing printed circuit board 11 and includes a first leg portion 141, which changes its contact / non-contact state with the conductive portion of first circuit 111 on printed circuit board 11 according to the rotational state of rotor 12; and a second leg portion 142, which changes its contact / non-contact state with the conductive portion of second circuit 112 on printed circuit board 11 according to the rotational state of rotor 12. It should be noted that first circuit 111 and second circuit 112 are circuits used to detect whether the seat belt is installed or removed.

[0027] Figure 5 represents the direction of the rotor 12 in the initial state, Figure 6 The direction of the rotor 12 is shown when the rotor 12 is fully rotated in the forward direction.

[0028] The seatbelt attachment and detachment detection switch 1 of this embodiment achieves miniaturization by replacing the conventional slider that slides in a single axial direction in conjunction with the insertion and removal of the seatbelt tongue from the buckle with a rotor 12 that rotates. Furthermore, a torsion coil spring 13 allows the rotor 12, which rotates forward as the tongue is inserted into the buckle, to rotate backward as the tongue is removed from the buckle, restoring the rotor 12 to its initial state. Furthermore, claws 123 and 126 provided on the rotor 12 prevent the rotor 12 from floating or falling off the printed circuit board 11. Furthermore, the first and second protrusions 124 and 125 provided on the rotor 12 and the first and second grooves 115 and 116 that engage therewith allow the rotor 12 to rotate within a predetermined angular range.

Claims

1. A seat belt installation and removal detection switch, characterized in that: Include: a printed circuit board containing a circuit for detecting the installation and removal of the seat belt; a rotor rotatably mounted on the printed circuit board, including a contact portion for contacting a locking tongue of the seat belt, and rotating in a forward direction as the locking tongue is inserted into the buckle; a spring that causes the rotor, which rotates in a forward direction, to rotate in a reverse direction as the locking tongue is pulled out of the buckle; a brush mounted on a surface of the rotor facing the printed circuit board and having a leg portion that changes its contact / non-contact state with the conductive portion of the circuit according to the rotation state of the rotor; The rotor includes a claw extending toward the printed circuit board and protruding in a direction different from the extending direction. The printed circuit board includes an arc-shaped slit through which the claw is inserted.

2. The seat belt installation and removal detection switch according to claim 1, wherein: The rotor includes a shaft extending toward the printed circuit board. The printed circuit board includes a hole that fits into the shaft. The spring is a torsion coil spring, The coil of the torsion coil spring is inserted through the shaft, one end portion of the torsion coil spring is fixed to the rotor, and the other end portion of the torsion coil spring is fixed to the printed circuit board.

3. The seat belt installation and removal detection switch according to claim 1 or 2, wherein: The rotor includes a first protrusion for limiting forward rotation and a second protrusion for limiting reverse rotation. The printed circuit board comprises: a first groove, which engages with the first protrusion when the rotor is at a preset limit angle of forward rotation; The second groove is engaged with the second protrusion when the rotor is in reverse rotation at a preset limit angle.

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