JP3319714B2 - Structure to prevent forgetting to remove the lock pin of the shock detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an impact detector, and more particularly to a structure for preventing a lock pin for locking a switch mechanism in a reset state from being forgotten.

[0002]

2. Description of the Related Art For example, in an automobile, in order to ensure safety at the time of a vehicle collision, when an impact force exceeding a predetermined value is applied, fuel to an engine is shut off, an air bag is activated, or a door lock is applied. Or a mechanism for canceling the operation.

Conventionally, as an impact detector for detecting such an impact at the time of a collision, for example, a detector described in Japanese Patent Application Laid-Open No. 9-152445 is generally used. This is a schematic structure in which a ball that is moved by an impact force is placed stationary in a housing, and a rod is placed so as to be able to move up and down in a vertical direction, and the ball is pressed in a stationary state by the rod. Then, the rod moves in the anti-pressing direction in accordance with the movement of the ball due to the impact force, so that the electric circuit is switched between an energized state and a non-energized state.

When the impact detector is shipped from the factory, it is necessary to hold the rod in a reset state.
Therefore, a lock pin for locking the rod in a ball pressing state may be mounted. In this case, after the shock detector is attached to, for example, the vehicle body, the lock pin is pulled out to set the shock detector in the operating state.

On the other hand, some external force is applied depending on the arrangement of the impact detector, which may cause malfunction. In order to prevent this, the impact detector may be surrounded by a cover member to protect it from external force.

[0006]

However, if the lock pin is forgotten to be removed when the impact detector is mounted, it is difficult to confirm whether or not the lock pin has been removed by attaching the cover member in this state. Problem arises.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a structure for preventing a lock pin from being forgotten to be removed from an impact detector which can reliably prevent the lock pin from being forgotten when a cover member is mounted. I have.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a ball is movably disposed in a moving chamber formed in a housing, and the ball is biased by a distal end of a rod supported by the housing so as to be able to advance and retreat in the axial direction. A switch mechanism is provided for switching the electric circuit between an energized state and a non-energized state when the ball is moved by an impact force of a predetermined value or more and the rod moves in the axial direction, and the rod is locked at the ball pressing position. In a shock detector in which a lock pin to be removed is disposed so as to be able to be extracted outside and a protective cover is attached so as to surround the housing, the lock pin protrudes outward from the protective cover and the lock pin is attached when the protective cover is attached. This is a structure for preventing the lock pin of the impact detector from being forgotten to be removed, which is extended outward so as to interfere with the protective cover.

[0009]

According to the present invention, since the protective cover interferes with the lock pin when the protective cover is mounted, the protective cover cannot be mounted with the lock pin mounted. There is an effect that it is possible to surely prevent forgetting to pull out and to guarantee the operation at the time of collision.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 are views for explaining a structure for preventing forgetting to remove a lock pin of an impact detector according to an embodiment of the present invention. FIG. 1 is a cross-sectional view of the impact detector, and FIG. FIG. 3 is an exploded perspective view of the switch mechanism with the lock pin mounted, and FIG. 4 is an exploded perspective view with the cover member mounted. In the present embodiment, a case where the vehicle is connected to a fuel supply device of an automobile will be described as an example.

In FIG. 1, reference numeral 1 denotes an impact detector, which is provided with a metal ball 3 in a resin housing 2 and presses the ball 3 with a rod 4.
Is locked to the pressing position by the lock pin 15, and the protective cover 19 is mounted in the vehicle-mounted state.

The inside of the housing 2 is defined by a ball moving chamber 5a and a rod arrangement chamber 5b by a partition wall 2a formed substantially at the center, and the bottom wall 2b of the moving chamber 5a has an inverted conical shape. A dish member 6 having an inclined surface 6a is arranged. A ball 3 as an inertial body is arranged at a bottom position at the center of the plate member 6 so as to be stationary.
Move on the inclined surface 6a by an impact force.

The rod 4 is substantially rod-shaped, and is supported by a boss 2c formed in the housing 2 and a guide hole 2a so as to be able to move up and down in the vertical direction. The lower end 4a of the rod 4 has a partition wall 2a. , And protrudes into the moving chamber 5 a, and the lower end surface thereof is in contact with the ball 3. This rod 4
A band plate-shaped retainer 7 is fixed to the central portion in the axial direction, and a spring 8 is interposed between the retainer 7 and the boss 2c. As a result, the rod 4 urges the ball 3 toward the bottom position.

A switch mechanism 10 is provided in the rod arrangement chamber 5b. This switch mechanism 10
As shown in FIG. 2, the fixed contact 10a fixed to the housing 2 and the movable contact 10b fixed to the retainer 7 of the rod 4 are brought into an electrically energized state or a non-energized state by moving the rod 4 forward and backward. , And each of the contacts 10a and 10b is led out to a terminal 11 connected to the bottom of the housing 2. The terminal 11 is connected between a fuel pump (not shown) and a battery via a lead wire 12.

In the stationary state where no impact force is applied, the movable contact 10b contacts the fixed contact 10a and is always in an energized state, and the impact force causes the rod 4 to move in the urging direction (in accordance with the movement of the ball 3). When the movable contact 10b moves in the downward direction, the movable contact 10b separates from the fixed contact 10a and becomes non-energized, whereby the fuel supply from the fuel pump to the engine is cut off. The switch mechanism 10 may be configured to be energized when an impact force is applied. In such a case, the fixed contact is disposed below the movable contact.

An opening 12 communicating with the outside is formed in the rod disposition chamber 5b by an upper front wall 2d extending forward in an eaves shape and a lower front wall 2e located rearward of the upper front wall 2d.
Are formed. A reset button 13 is inserted into the opening 12, and the reset button 13 is supported by the inner surface of the upper front wall 2d and the outer surface of the lower front wall 2e so as to be vertically slidable.

An engagement hole 13a is formed at the upper end of the reset button 13, and the front end of the retainer 7 is inserted and fixed into the engagement hole 13a. When the rod 4 is moved in the counter-biasing direction (ascending direction) by pushing up the reset button 13, the ball 3 is located at the center bottom of the dish member 6, and the movable contact 10b contacts the fixed contact 10a. When the reset button 13 is released in this state, the rod 4 is pressed against the ball 4 by the urging force of the spring 8 and reset.

A lock hole 13b is formed at the lower end of the reset button 13, and engagement grooves 13c and 1c are formed on the left and right side walls.
3c is formed. And this reset button 13
, A lock pin 15 is detachably mounted.
The lock pin 15 is a fork-shaped one in which a lock piece 15b and left and right engagement claws 15c, 15c are integrally formed on a band-shaped body portion 15a. Inserted into the lock hole 13b,
The right engagement claws 15c are respectively engaged in the engagement grooves 13c.

The axial movement of the rod 4 is restricted by the lock pin 15, whereby the reset state is maintained. That is, the lowering of the rod 4 is restricted by pressing the ball 4 with the spring 8, and the raising of the rod 4 is restricted by the body 15 a of the lock pin 15 abutting on the lower edge of the upper front wall 2 d. ing. In this case, when the ball 3 moves slightly from the rest position and rises along the inclined surface 6a, the rod 4 becomes, for example, 1.5 m
However, the lock pin 15 contacts the upper front wall 2d to restrict the rod 4 from rising.

The housing 2 is bolted and fixed to a mounting member 18 of a vehicle body via a bracket 17.
The impact detector 1 is surrounded by a protective cover 19 for protecting it from external force. The protective cover 19 is fastened and fixed to the mounting member 18 by bolts 20,20. The main body 15a of the lock pin 15 is extended so as to protrude forward from the protective cover 19, whereby the lower edge 19a of the lock pin 15 comes into contact with the main body 15a when the cover member 19 is attached. I have. Thus, forgetting to remove the lock pin 15 is prevented.

The operation of the shock detector 1 will be described. In the shock detector 1 of the present embodiment, when an impact force is applied due to a collision of a vehicle, the ball 3 moves on the inclined surface 6a while temporarily raising the rod 4, and when the ball 3 further moves, the rod 4 is moved from the ball 3 It comes off and descends due to the urging force of the spring 8. As a result, the movable contact 10b descends and becomes non-energized, thereby stopping the fuel pump,
The fuel supply is shut off. To reset the shock detector 1 from this state, the rod 4 is raised by pushing up the reset button 13. Then, the ball 3 descends on the inclined surface 6a and stops at the bottom. When the reset button 13 is released in this state, the rod 4 presses the ball 3, and the movable contact 10b comes into contact with the fixed contact 10a. As a result, fuel can be supplied to the engine.

In order to mount the shock detector 1 on a vehicle body, the brackets 17 and 17 of the housing 2 are bolted and fixed to a mounting member 18, and then the lock pin 15 is pulled out to bring the shock detector 1 into an operable state. I do. Then, a protective cover 19 is attached to the impact detector 1, and the protective cover 19 is fixed to the mounting member 18. In this case, if the lock pin 15 is forgotten to be removed, the lower edge 19a of the protective cover 19 interferes with the lock pin 15 and the protective cover 19
Cannot be attached, so that forgetting to remove the lock pin 15 is automatically detected.

As described above, according to the present embodiment, the lock pin 15 for locking in the reset state is formed so as to extend so as to protrude forward from the protective cover 19, and interferes with the protective cover 19 when the protective cover 19 is attached. Therefore, when the lock pin 15 is attached, the protection cover 19
Cannot be attached, and forgetting to remove the lock pin 15 can be reliably prevented. Further, since the main body 15a of the lock pin 15 only needs to be formed so as to extend so as to interfere with the protective cover 19, an increase in cost can be suppressed.

In the above embodiment, the case where the impact at the time of a vehicle collision is detected and the fuel supply to the engine is cut off has been described as an example. However, the application of the present invention is not limited to this. Of course, the present invention can also be applied to an impact detector such as a back operating device and a door unlocking device, or to an impact detector in a machine other than an automobile such as a press device.

[Brief description of the drawings]

FIG. 1 is a sectional view of an impact detector according to an embodiment of the present invention.

FIG. 2 is a schematic view of a switch mechanism of the shock detector.

FIG. 3 is an exploded perspective view showing a state in which a lock pin of the shock detector is attached and detached.

FIG. 4 is an exploded perspective view showing a state in which a protective cover of the impact detector is attached and detached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shock detector 2 Housing 3 Ball 5a Moving chamber 4 Rod 4a Rod tip 10 Switch mechanism 15 Lock pin 19 Protective cover

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01P 15/135 B60R 21/32 H01H 13/04

Claims (1)

(57) [Claims] A ball is movably disposed in a moving chamber formed in a housing, and the ball is pressed with a biasing force by a tip of a rod supported by the housing so as to be able to advance and retreat in an axial direction, and the ball is pressed to a predetermined value or more. A switch mechanism is provided to switch the electric circuit between the energized state and the non-energized state when the ball moves due to the impact force and the rod moves in the axial direction, and the lock pin that locks the rod at the ball pressing position is pulled out. In a shock detector arranged as possible and fitted with a protective cover so as to surround the housing,
A structure for preventing the lock pin from being forgotten in the shock detector, wherein the lock pin protrudes outward from the protective cover and extends outward so as to interfere with the protective cover when the protective cover is mounted.