JPH0722832Y2 - Kill switch - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a kill switch used for stopping an engine such as a vehicle such as a snowmobile or a buggy or a motor boat, and particularly maintains a good contact state. Regarding what you can do.

[Prior Art] A kill switch including a movable contact housed so as to be movable in a space of a housing and a plate-shaped fixed contact that comes in contact with and separates from the movable contact is known.

As a switch similar to such a switch,
There is No. 101437. This product has a substantially rectangular plate-shaped movable contact at the tip of a shaft that is supported in the housing so that it can move forward and backward, and when this movable contact moves forward and backward together with the shaft, it will move in any direction to connect. First and second fixed contacts are provided.

In addition, in Japanese Utility Model Laid-Open No. 59-93018, a shaft that can be freely moved back and forth into the housing is provided, and a first movable contact is attached around the shaft and a disk-shaped second movable contact is attached to the tip of the shaft. A pair of plate-shaped fixed contacts sandwiching the two movable contacts in parallel with the shaft are provided, and the tips of the fixed contacts are bent in the direction of the shaft in a taper shape so that they can slide with the first movable contact, and the intermediate It is shown that the bent portion provided in the portion can be pressed against the second movable contact.

[Problems to be Solved by the Invention] According to the above configuration, the kill switch may not be contact-connected for a long time. Even in such a case, the movable contact contacts the fixed contact in order to ensure reliable conduction. At this time, it is desired that the contact state of the contacts be improved by wiping the contact portions of both.

However, in Japanese Utility Model Laid-Open No. 58-101437, the fixed contact on the pull-out side is a pressing type, so that strong and reliable wiping cannot be performed when connecting the contacts. Further, since the shaft and the movable contact are not rotatable about the axis of the shaft, only the strong pressing force can be applied even on the pushing side, and the wiping cannot be more reliably performed.

Further, in the case of No. 59-93018, the sliding contact and the pressing contact are provided, but since the contact pressure at the time of connection is constant, strong and reliable wiping cannot be performed.

Therefore, an object of the present invention is to provide a kill switch capable of strong and reliable wiping.

[Means for Solving the Problems] In order to solve the above problems, a kill switch according to the present invention is mounted on a housing, a shaft that can be pushed into and pulled out of the housing, and a portion of the shaft inside the housing. Disk-shaped movable contact
In a kill switch including a first fixed contact with which the movable contact comes in contact with movement of the shaft in the pull-out direction and a second fixed contact with which the movable contact comes in contact with movement of the shaft in the pushing-out direction, the first fixed contact is pulled out from the shaft. It consists of a plate-shaped member with a tapered part that tapers in the direction, and the movable contact is formed as a sliding contact that makes sliding contact when moving in the shaft withdrawal direction, and the tip of the tapered part is movable. It is characterized in that it is formed inside the outer peripheral portion of the contact and the second fixed contact is formed as a pressing contact.

[Operation of the Invention] In the kill switch according to the present invention, when the shaft is moved in the pull-out direction, the movable contact is also integrally moved and slidably contacts the tapered portion of the first fixed contact. At this time, the taper part has a tapered shape in the shaft withdrawal direction, and the tip is a free end that goes inward from the outer peripheral part of the movable contact, so it is elastically deformed and spread, and the repulsive force due to this deformation Since the contact pressure increases at, strong and reliable wiping is performed.

On the contrary, when the shaft is pushed in, the movable contact is pressed against the second fixed contact, but since the shaft is round bar-shaped and rotatably supported with respect to the housing, and the movable contact is disc-shaped, here When the movable contact plate is rotated by rotating the shaft while pressing it strongly, strong and reliable wiping is performed.

Therefore, since the contact is not connected for a long period of time, the contact can be surely conducted even if the contact is in a poor conduction state, and further, the conduction can be surely conducted even if the shaft is moved to either the pulling side or the pushing side. .

Further, since the movable contact is formed of a metal disc-shaped conductor, the contact portion of the movable contact has no directivity, and the contact with the fixed contact can be ensured.

[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a vertical sectional view of the kill switch, and a contact receiving space 2 is formed inside the housing 1. A base 3 is attached to one end 1a of the housing 1 so as to close one end of the contact receiving space 2. A step portion 1b is formed on the inner peripheral surface of the one end portion 1a, and the base 3 is positioned here.

A shaft 4 made of a conductor is movably supported in a shaft hole formed through the housing 1. First
In the figure, reference numerals 4a and 4b are seal rings, and 4c is a groove for storing grease.

A disk-shaped movable contact 5 is attached to an end of the shaft 4 which is housed in the contact housing space 2. The movable contact 5 is loosely fitted to the tip of the shaft 4 and is urged by a contact spring 6 to generate a contact pressure. The movable contact 5 is prevented from falling off by a stopper 5a attached to the tip side of the shaft 4, and is urged upward in FIG. 1 by a return spring 7 having one end abutting against the stopper 5a. The other end of the shaft 4 projects outside the housing 1 and is attached to the handle 8. One end of a string 9 is attached to the handle 8,
The other end is attached to an occupant's body (not shown).

Attachment part 8a of the handle 8 to the neck 1c of the housing 1
Has a cylindrical shape that opens downward and is fitted around the neck 1c so that it can slide in the vertical direction in the figure. Sign
1d and 8b are stoppers bulged at the tips of the neck portion 1c and the mounting portion 8a, respectively. As a result, the mounting portion 8a and the neck portion
The 1c is relatively rotatable, but the mounting portion 8a is easily prevented from falling off the neck 1c.

Further, a pair of first fixed contacts 10 and second fixed contacts 11 are planted in the base 3, respectively. These first
The fixed contact 10 and the second fixed contact 11 are made of the same plate-like conductor member, and are formed by bending both ends of the same in the same direction with different heights. It has been inserted.

The first fixed contact 10 extends from the base 3 toward the movable contact 5, and its free end can be brought into contact with and separated from the side surface of the movable contact 5 facing the base 3.

On the other hand, the second fixed contact 11 is connected from the base 3 to the housing 1.
Along the inner wall surface of the above, it passes through the movable contact 5 and extends upward, and its free end is tapered so as to be tapered toward the shaft 4. This second
The fixed contact 11 is formed along a tapered wall surface 12 (see FIG. 2) formed on the inner wall surface of the housing 1.
The tapered wall surface 12 is inclined in the axial direction of the shaft 4, that is, in the moving direction of the movable contact 5, and is formed at the connecting portion between the contact receiving space 2 and the shaft hole.

The first fixed contact 10, the second fixed contact 11 and the shaft 4 serve as kill switch terminals in a closed circuit (not shown).

Therefore, when the shaft 4 is moved downward, for example, in the state shown in FIG. 1, the movable contact 5 comes into contact with the first fixed contact 10 against the return spring 7, and the switch is turned on to close a predetermined circuit.

On the other hand, when the shaft 4 is pulled upward by the handle 8, the shaft 4 moves upward against the first return spring 6, and the periphery of the movable contact 5 is formed at the tip of the second fixed contact 11. Switch on by sliding contact with the taper.

Therefore, if this kill switch is used, the attaching portion 8a is detached from the neck portion 1c by manually pushing down the attaching portion 8a, or when the occupant is largely separated from the predetermined position, by the string 9 attached to the occupant at one end. By
Both of them are switched on to stop the engine (not shown).

Moreover, since the second fixed contact 11 is formed in a conical shape in the direction of the shaft 4, the contact between the movable contact 5 and the second fixed contact 11 is performed on the slope of the second fixed contact 11. Therefore, the free end side of the second fixed contact 11 is elastically deformed and spread by the movable contact 5, and the repulsive force increases the contact pressure. You can surely wipe.

Further, when the shaft 4 is pushed downward, the movable contact 5 is pressed against the tip of the first fixed contact 10. In this case, since the contact pressure is pushed in, the force can be raised by further applying a force to the shaft 4, and further, by rotating the shaft 4, the movable contact 5 can be rotated.
Since it has a disk shape, it rotates while maintaining the contact connection state,
Strong and reliable wiping can be performed by relative sliding with the first fixed contact 10 at this time.

Therefore, by not connecting the contacts for a long period of time, it is possible to ensure the conduction even if the contact portion has poor continuity.
In addition, the shaft 4 can be surely conducted even if it is operated either in the pulling-out direction (upper drawing) or the pushing-in direction (lower drawing). Reference numeral 13 in FIG. 1 indicates that the base 3 is the housing 1
It is an insulating layer that is potted after being attached to.

Next, a method of forming the second fixed contact 11 will be described. As shown in FIG. 2, first, the insert molded product A of the first fixed contact 10 and the second fixed contact 11 and the base 3 is molded in advance. At this stage, initially, the second fixed contact 11 has the first
It is in a state of extending straightly upward from the base 3 in parallel with the fixed contact 10 of. Therefore, insert molding is also relatively easy.

On the other hand, since one end 1a of the housing 1 is still open, the shaft 4 is inserted into the contact receiving space 2 from this opening side, and the insert molded product A is inserted into the first fixed contact 10 and the second fixed contact. The contact 11 is pushed first into the contact receiving space of the housing 1 from the same direction as the shaft 4. Then,
The free end portion of the second fixed contact 11 is guided by the tapered surface 12 of the housing 1 and bends in the direction of the shaft 4 as the insert molding A is pushed.

The plate-like material forming the second fixed contact 11 has a plate thickness and the like set in advance so that the plate-like material is relatively easy to bend. Eventually, the base 3 will be positioned when it reaches the step 1b on the inner peripheral surface of the housing 1, and the base 3 will not enter the housing 1 any more. At this time, the first fixed contact
10 is located near the surface of the opening 5 on the side of the base 3 with a predetermined interval, and the free end of the second fixed contact 11 is bent in a tapered shape as shown in FIG. It is located above the surface on the opposite side of the opening 5 with a predetermined interval.

After that, the insulating layer 13 is potted on the exposed surface of the base 3, and the handle 8 is attached to the neck 1c of the housing 1 to be integrated with the end of the shaft 4 to form the kill switch shown in FIG. It should be noted that if the connecting portion between the first fixed contact 10 and the second fixed contact 11 in the plate-shaped conductor member shown by reference numeral 14 in FIG. The kill switch is configured.

[Effects of the Invention] A kill switch according to the present invention includes a housing, a shaft that can be pushed into and pulled out from the housing, a disk-shaped movable contact that is attached to an inside portion of the shaft, and a movable contact. In a kill switch including a first fixed contact whose movable contact comes into contact with movement of the shaft in the pulling-out direction and a second fixed contact which comes into contact with movement of the shaft in pushing-out direction, the first fixed contact is brought into the pulling-out direction of the shaft. It is composed of a plate-shaped member provided with a tapered portion that is tapered toward the end, and the movable contact is formed as a sliding contact that makes sliding contact when moving in the shaft withdrawal direction, and the tip of the tapered portion is the movable contact. Since the second fixed contact is formed as a pressing contact while allowing it to enter inside the outer periphery of the Therefore, even if the contact is in a poor conduction state, it can be surely conducted, and even if the shaft is moved to either the pulling-out side or the pushing-in side, it can be surely conducted.

Further, since the movable contact is formed of a metal disc-shaped conductor, the contact portion of the movable contact has no directivity, and the contact with the fixed contact can be ensured.

[Brief description of drawings]

1 and 2 show an embodiment, FIG. 1 is a sectional view of the entire kill switch, and FIG. 2 is an assembly explanatory view of a main part. (Explanation of reference numerals) 1 ... Housing, 2 ... Contact receiving space, 3 ... Base, 4 ...
Shaft, 5 ... Movable contact, 10 ... First fixed contact, 11 ... Second fixed contact, 12 ... Tapered surface.

Claims (1)

[Scope of utility model registration request] 1. A housing, a shaft that is supported by the housing so that it can be pushed in and pulled out of the housing, a disk-shaped movable contact attached to an inner portion of the housing of the shaft, and the movable contact that moves in the extraction direction of the shaft. In a kill switch that includes a first fixed contact that makes contact with the shaft and a second fixed contact that makes contact when the shaft moves in the pushing direction, the first fixed contact has a tapered shape in the direction of pulling out the shaft. It is composed of a plate-shaped member with a tapered portion that forms a sliding contact that makes sliding contact when the movable contact moves in the shaft withdrawal direction, and the tip of the tapered portion enters inside the outer periphery of the movable contact. The kill switch is characterized in that the second fixed contact is formed as a pressing contact.