JPH06101271B2 - Stop plum switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a stop circuit that interlocks with a foot brake pedal of a vehicle or the like and that blinks a stop lamp attached to the rear part of the vehicle, such as a warning or cancel. A warning circuit that outputs a signal relates to a stop lamp switch installed in a case as an independent circuit.

(Prior Art) Conventionally, in a vehicle that requires a stop circuit and a warning circuit of this type, two switches dedicated to each circuit are separately installed, or both circuits are provided in one case, and a foot brake is provided. A stop lamp switch is installed that activates the stop circuit and the warning circuit simultaneously with the operation of the pedal.

Regarding such a conventional stop lamp switch,
This will be described with reference to FIGS. 11 to 14.

FIGS. 11 and 12 are a combination of two circuits in the axial direction. FIG. 11 is a cross-sectional view thereof, and FIG. 12 is an arrow A of FIG.
It is a bottom view seen from the direction.

The stop lamp switch is a mounting shaft with a male thread 1
A plate-shaped base 3 in which two fixed terminals 2 made of plate springs each having a V-shaped sliding contact portion 2a formed on the upper part thereof are planted so as to face each other at the lower end of the A switch for the covered warning circuit is attached, and further, using the stepped portion provided on the lower surface of the plate-like base 3, the two fixed contacts 6 respectively connected to the external terminals 5 are provided on the lower surface.
A stop circuit switch housed in a rectangular tubular base 7 made of an insulating material and fixed to the bottom surface is fixed. A cylindrical sliding terminal 8 is fixed to the lower end of the mounting shaft 1 in the central through hole 1a, and a return spring 9 is provided on the outer periphery of the mounting shaft 1 so that an operating shaft 10 that is always biased upward can move up and down. It is installed. In the center of the plate-like base 3, a sub-actuating shaft which is always urged toward the one side by a return spring 11 is coaxial with the above-mentioned actuating shaft 10.
12 is mounted so that it can move up and down. An operating arm 14 for driving the leaf spring device 13 is attached to the lower end of the sub-actuating shaft 12, and drives a movable terminal 16 connected to the leaf spring device 13 and having two opposed contacts 15 fixed thereto. The opposed contact 15 is urged downward by the leaf spring device 13 to come into contact with the fixed contact 7 on the bottom surface of the rectangular cylindrical base 7 and is in a normally closed state. The above-mentioned two fixed terminals 2 form an external terminal portion 2b by projecting an L-shaped leg portion onto the lower surface of the plate-shaped base 3.

The operation of the stop lamp switch composed of the normally closed stop circuit and the normally open warning circuit will be described below.

The switch is in a state in which the operating shaft 10 is pushed in when it is attached to the vehicle body.

When you press the brake pedal, the working shaft 10 and the sub-working shaft 12
Rises due to the work of two unreturned 9 and 11
First, the actuating arm 14 of the sub-actuating shaft 12 opens the leaf spring device 13, and the opposing contact 15 of the movable terminal 16 connected to the leaf spring device 13 contacts the fixed contact 6 of the rectangular cylindrical base 7 to stop the stop circuit. To the closed state. When the working shaft 10 and the sub-working shaft 12 continue to rise,
The sliding terminal 8 at the lower end of the actuating shaft 10 inserted between the two sliding contact portions 2a is separated from the sliding contact portion 2a to open the warning circuit. Furthermore, the working shaft 10 and the sub-working shaft
When 12 rises, the step portion of the actuating shaft 10 separates from the sub actuating shaft 12 and rises and stops by the action of the return spring 9 independently.

When the brake pedal is released, the return force of the pedal causes the operating shaft 10
Is pushed in, and the stepped portion 8a of the sliding terminal 8 first fixed to the shaft end
Hits the head of the auxiliary operating shaft 12 and pushes it down against the urging force of the return spring 11. Further, when the operating shaft 10 is pushed in, the sliding terminal 8 is inserted between the two sliding contact portions 2a of the warning circuit switch to close the warning circuit. Subsequently, when the operating shaft 10 is pushed in, the operating arm 14 of the sub-operating shaft 12 that interlocks with this is driven by the leaf spring device 13,
The movable terminal 16 connected to the leaf spring device 13 is pulled up. When the movable terminal 16 moves upward, the opposed contact 15 fixed to the movable terminal 16 is fixed to the fixed contact 6 fixed to the bottom surface of the rectangular cylindrical base 7.
Then, the stop circuit is opened and one cycle of opening and closing the electric circuit is completed.

Next, a stop lamp switch in which a stop circuit and a warning circuit are arranged side by side on a plane perpendicular to the operating axis will be described with reference to FIGS. 13 and 14.

FIG. 13 is a side sectional view of the stop lamp switch, and FIG. 14 is a bottom view seen from the direction of arrow A shown in FIG.
The stop lamp switch is a rectangular tubular base provided with two connecting pieces 17 to which fixed downward facing contacts 6 are fixed and two connecting pieces 18 not shown in the figure, which form opposed sliding contacts. From the rigid body, which is fixed to the base 7 and the two fixed contacts 6 under the fixed contacts 6 and is urged upward by the return spring 19 to come into contact with the fixed contacts 6 to be in the normally closed state. The movable terminal 16 and the rectangular cylindrical base 7 are fixed to a cover 21 fixed via a spacer 20, and a mounting shaft 1 having an externally threaded outer periphery, and a central through hole 1a of the mounting shaft 1 are vertically moved. A sliding terminal (not shown), which is fitted movably and is inserted between the above two sliding contacts at the lower end to conduct the two contacts, is always urged upward by a return spring 9. And the operating shaft 10.

As shown in FIG. 14, the above-mentioned two pairs of connecting pieces 17 and 18 are provided.
Are respectively connected to the external terminals 5 on the lower surface of the rectangular cylindrical base 7.

The operation of the stop lamp switch composed of the normally closed stop circuit and the normally open warning circuit will be described below.

When the brake pedal is depressed and the operating shaft 10 is pushed in against the urging force of the return spring 9, a sliding terminal (not shown) mounted on the lower end of the operating shaft 10 has two sliding contacts (not shown). )) And conducts it to close the warning circuit. When the operating shaft 10 is pushed in continuously, the lower end of the operating shaft 10 contacts the movable terminal 16, and thereafter the movable terminal 16 descends in conjunction with the operating shaft 10. When the movable terminal 16 is lowered, the counter contact 15 fixed to the movable terminal 16 is separated from the fixed contact 6, and the stop circuit is opened.

When the brake pedal is released, the actuating shaft 10 and the movable terminal 16 are raised by the action of the return springs 9 and 19, first the stop circuit is closed, then the warning circuit is opened, and the actuating shaft 10 Is pressed by the return spring 9 and returns to its original position, completing one cycle of opening and closing the electric path.

(Problems to be solved by the invention) However, the stop circuit for switching a large current has a high reliability and a long service life by a switch of a mechanical opposed contact type, but a warning circuit for switching a minute current has a mechanical sliding contact. The switch of the dynamic contact type or the mechanical counter contact type has a problem of lack of reliability and a short life. In particular, when the warning circuit is connected to a circuit that outputs a cancel signal, there is a problem that it may lead to a vehicle accident.

Further, there is a problem in that the contact is contaminated by dirt and dust entering through the gap between the mounting shaft and the operating shaft, resulting in low reliability.

In addition, there is a problem that the structure is complicated, the number of structural parts is large, and the assembling workability is poor.

The present invention solves the above problems, and provides a stop lamp switch having a simple structure, excellent assembling workability, high reliability in both the stop circuit and the warning circuit, and a long life.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides two rigid L-shaped mechanical opposing contact type L-shaped members that form a stop circuit in a base. The fixed terminal and the electronic contactless type photo interrupter that constitutes the warning circuit are fixed on the same plane side by side, and the movable arm that is always in contact with the fixed terminal by the return spring is linked to the lower part of the operating shaft. And a light-shielding arm that is inserted into the slit of the photointerrupter and blocks the light of the light-emitting element.

Also, at the upper part of the operating arm provided at the lower part of the operating shaft, between the outer peripheral surface of the operating shaft and the inner peripheral corner of the cover mounted on the mounting shaft, a seal made of a flexible thin film is used. It is fixed with and the switch part is sealed.

(Operation) Since the stop circuit is a mechanical counter contact type and the warning circuit is an electric non-contact type, the number of parts is reduced and the assembly workability is improved.
In particular, it is possible to obtain a stop lamp switch with improved reliability and a longer life of the warning circuit.

Further, if the switch part is hermetically sealed, dirt can be prevented from entering, and the reliability is significantly improved.

(Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 to 7, and a second embodiment will be described with reference to FIGS. 8 to 10.

FIG. 1, FIG. 2 and FIG. 3 are a plan view, a side sectional view and a plan sectional view taken along the upper end surface of a cylindrical base, respectively, of a stop lamp switch according to the present invention. In the stop lamp switch shown in FIG. 3, a fixed contact 6 is fixed to the left end of a cylindrical base 22 made of an insulating material in a bent portion at the upper end and an external terminal portion 23a at the lower end in FIG.
Is an L-shaped fixed terminal 23 composed of two rigid bodies that are planted so as to project from the lower surface of the cylindrical base 22, and a slit 24a is mounted on the right side so as to face the center as shown in FIG. The photo interrupter 24 and the two facing the fixed contact 6 described above.
Upwardly movable rigid U-shaped movable terminal 16 which is fixed to each of the opposed contacts 15 and is always urged upward by a return spring 19, and an operating arm 10a for pushing down the movable terminal 16 and FIG. As shown, the light-shielding arm 10b inserted into the slit 24a of the photo interrupter 24 is extended to the left and right in a reverse T shape, and the return spring 9 always biases the actuating shaft 10 upward and the central portion of the above-mentioned Central through hole that accommodates the operating shaft 10 slidably up and down
1a and a mounting shaft 1 with an external thread 1b cut off, a cover 21 fixed to the lower end of the mounting shaft 1 for mounting the cylindrical base 22 on the mounting shaft 1, the cover 21 and the above And a spacer 20 having four protrusions 20a for determining a relative position of the cylindrical base 22 and providing a space above. The return spring 19 for urging the movable terminal 16 is guided by the outer peripheral surface of the annular protrusion 22a formed on the left bottom surface of the cylindrical base 22, and the operation shaft 10
The return spring 9 biased to is guided by a guide hole 10c formed in the center of the operating shaft 10 and a spire-shaped projection 22b provided in the center of the bottom surface of the cylindrical base 22.

FIG. 1 is a plan view of the stop lamp switch described above. A cover 21 is fixed to the lower end of the mounting shaft 1 in which the operating shaft 10 is fitted in the central through hole 1a.

FIG. 3 is a cross-sectional view taken along the upper end surface of the cylindrical base 22. Two fixed contacts 6 are planted on the left side of the cylindrical base 22 and a photo interrupter 24 having a slit 24a is planted on the right side. And the movable terminal 16 is mounted on the left side under the fixed contact 6.
Is pressed against the fixed terminal 23 by a return spring 19 (not shown in the figure) that biases upward, that is, toward the front side of the drawing,
The closed state in which the fixed contact 6 and the opposed contact 15 fixed to each other are brought into contact with each other is the open state in which the light shielding arm 10b at the lower end of the operating shaft 10 is inserted between the slits 24a of the photo interrupter 24 on the right side. Each is drawn.

The operation of the stop lamp switch, in which the stop circuit is a mechanically opposed contact type normally closed type and the warning circuit is an electronic non-contact type normally open type, will be described with reference to FIGS. 4 to 7. .

4 (a) and (b) and FIGS. 5 (a) and (b) are side cross-sections taken along a plane perpendicular to the drawing, including the line XX 'and the line YY' shown in FIG. 2, respectively. In the figure, the state at the time of assembly and the state at the time of attachment to the vehicle body are opposite, that is, the right side (a) figure is the operating state, and the left side (b) figure is the plane state with the brake pedal released. Shown respectively.

When the brake pedal is depressed, the operating shaft 10 and the movable terminal 16 are raised by the action of the two return springs 9 and 19, and first, the counter contact 15 of the movable terminal 16 contacts the fixed contact 6 of the fixed terminal 23 to stop. Close the circuit and stop. The actuating shaft 10 continues to move upward due to the action of the return spring 9, and the light blocking arm 10b enters between the slits 24a of the photointerrupter 24, and the light emitting element 24b.
The infrared light is blocked from reaching the light receiving element 24c, and the warning circuit is opened.

When the brake pedal is released, the return force of the pedal causes the operating shaft 10
Is pushed against the urging force of the return spring 9, the light-shielding arm 10b of the operating shaft 10 descends between the slits 24a of the photointerrupter 24, and as shown in FIG. When the infrared light indicated by the arrow 24b reaches the light receiving element 24c, the photo interrupter 24 is closed, that is, the warning circuit is opened. This state is shown in FIG. 5 (b). Further, as the operating shaft 10 is pushed in, the operating arm 10a comes into contact with the movable terminal 16 as shown in FIG. 4 (b),
Pushes down against the urging force of the return spring 19 to secure an L-shaped fixed terminal
Counter contact 15 of movable terminal 16 that was in contact with fixed contact 6 of 23
To separate them into an open state. As a result, the stop circuit is opened, and one cycle of opening and closing the electric circuit is completed.

FIG. 6 is a model diagram showing the relationship between the photointerrupter 24 constituting the switch for the warning circuit and the light-shielding arm 10b of the operating shaft 10 in an extracted manner. 6 (a) and (b),
FIG. 6 (a) shows an operating state and a normal state, respectively.
In the state where the infrared light indicated by the three arrows of the light emitting element 24b blocked by the light does not reach the light receiving element 24c,
FIG. 3B shows a state in which the light shielding arm 10b has slipped out from the slit 24a and descended, and the infrared light indicated by the three arrows is incident on the light receiving element 24c.

FIG. 7 is a circuit diagram of a stop lamp switch, showing an operating state, and a stop lamp switch surrounded by a solid line,
A stop circuit is drawn on the upper side and a warning circuit is drawn on the lower side by a one-dot chain line. In the upper stop circuit, the fixed terminal 23 fixed contact 6 and the contact 15 of the movable terminal 16 are in contact with each other to close the state.
In the lower warning circuit, since the infrared light of the light emitting element 24b is blocked by the light blocking arm 10b, the light receiving element 24c is not conducting and is in an open state.

Next, a second embodiment of the stop lamp switch according to the present invention will be described with reference to FIGS. FIG. 8 is a side sectional view thereof, and FIGS. 9 and 10 are side sectional views taken along the line YY ′ and line XX ′ of FIG. 8 and seen toward the center.

In FIG. 8, the main points in which the second embodiment according to the present invention differs from the first embodiment shown in FIGS. 1 to 7 are as follows.
The protrusion 20a of the spacer 20 is formed into an annular protrusion 20b to widen the space, and the upper end surface of the annular protrusion 20b of the spacer 20 and the bottom surface of the cover 21 face each other, and the seal groove 10d provided in the middle of the operating shaft 10. The outer and inner diameters of the seal 25 made of a flexible film are fixed, and the switch part housed in the tubular base 22 is sealed.

Further, in the second embodiment, the return spring 9 for urging the operation shaft 10 is provided on the operation arm 10a, and the return spring 9 is the inner peripheral surface of the annular projection 22a formed on the left side of the bottom of the cylindrical base 22. And the outer peripheral surface of the columnar protrusion 10e provided at the operation center position of the operation arm 10a.

The operation of the stop lamp switch configured as described above as a switch is the same as that of the first embodiment, and the description thereof will be omitted. However, in the second embodiment, FIG.
As shown in (b) and FIGS. 10 (a) and (b), the inner diameter of the seal 25 fitted in the seal groove 10d is
Even if it goes down with 0, the seal 25 made of a flexible film is deformed and maintains a hermetically sealed state, so that dirt and dust that has entered through the gap between the central through hole 1a of the mounting shaft 1 and the operating shaft 10 adheres to the switch section. Since it is prevented from occurring, there is no accident due to dirt, and the reliability is remarkably improved.

(Effects of the Invention) As described above, according to the present invention, the switches for the stop circuit and the warning circuit are arranged side by side in a plane on the cylindrical base, and the stop circuit has the mechanical opposed contact type. Also, by using the electronic non-contact type using the photo interrupter for the warning circuit, the structure is simple, the workability is excellent, and the reliability is high.
A stop lamp switch with a long life can be obtained. In particular, since the warning circuit is opened and closed by an optical element, the reliability is remarkably improved and the life is extended as compared with the conventional example.

Further, since the number of constituent parts is reduced to about half that of the conventional product, the workability is remarkably improved and the cost can be significantly reduced.

Also, by sealing the switch part with a seal, dust in the air that enters through the gap between the mounting shaft and the operating shaft and the powder of the rubber-based stopper attached to the stop lamp operating part of the brake pedal of the vehicle, etc. , The switch part is not polluted, and the reliability is further improved.

[Brief description of drawings]

1, 2, and 3 are a plan view, a side sectional view, and a plan sectional view taken along the upper end surface of a cylindrical base, respectively, of a first embodiment of a stop lamp switch according to the present invention. And FIG. 5 are respectively XX ′ line and YY ′ of FIG.
FIG. 6 is a side cross-sectional view taken along a line and seen toward the center, in which the right side (a) of the center line is in an operating state and the left side (b) of FIG. Figures (a) and (b) are model diagrams for explaining the operation of the photointerrupter. Figure (a) is an operating state, (b) is a model diagram showing a normal state, and Figure 7 is a circuit diagram thereof. FIG. 8 is a side sectional view of a second embodiment of a stop lamp switch according to the present invention, and FIGS. 9 and 10 are side views for explaining the operation thereof, which are respectively YY 'line and XX' in FIG. In the side sectional view of the center line taken along the line, (a) to the right of the center line
The figure is a normal state and the left side view (b) is a side sectional view showing a normal state. 11 and 12 are a side sectional view and a bottom view of a conventional stop lamp switch in which a switch for a warning circuit and a switch for a stop circuit are axially connected, and FIGS. 13 and 14 are for a warning circuit and a stop circuit. It is a side sectional view and a bottom view of a conventional stop lamp switch in which fixed terminals for use are arranged in a plane. 1 ... Mounting shaft, 1a ... Center through hole, 1b ... Male screw, 2
...... Fixed terminal, 2a ...... Sliding contact part, 2b, 23a ...... External terminal part, 3 ...... Plate base, 4 ...... Case, 5 ...... External terminal,
6 ... Fixed contact, 7 ... Square tubular base, 8 ... Sliding terminal, 8a ... Step, 9,11, 19 ... Return spring, 10 ... Actuating shaft, 10a, 14 ... Actuation Arm, 10b ... Shading arm, 10c ... Guide hole, 10d ... Seal groove, 10e ... Columnar protrusion, 12 ... Sub-actuating shaft, 13 ... Leaf spring device, 15 ... Opposing contact, 16 ... Movable Terminal, 17,18 ... Connecting piece, 20 ... Spacer, 20a ... Projection part, 20b, 22a .... Circular projection, 21 ... Cover, 22 ... Cylinder base, 22b ... Spier-like projection, 23 ...... L-shaped fixed terminal, 24
...... Photo interrupter, 24a …… Slit, 24b …… Light emitting element, 24c …… Light receiving element, 25 …… Seal.

Claims (2)

[Claims] 1. Two fixed terminals made of a rigid body and a photointerrupter having a pair of a light emitting element and a light receiving element are fixed side by side, and are further urged upward by a return spring below the fixed terminals. In addition, a base on which a movable terminal made of a rigid body that constantly brings the above-mentioned two fixed terminals into conduction is arranged, and a center through hole of a mounting shaft fixed to a cover fixing this base is vertically movably fitted. An operating shaft, an operating arm provided under the operating shaft, with which the movable terminal is interlocked, and an operating arm provided under the operating shaft, which is inserted into the slit of the photointerrupter, and the light of the light emitting element is received by the light receiving element. A stop lamp switch characterized by having a light-shielding arm that blocks the arrival of the light. 2. A switch part is sealed by mounting a seal made of a flexible film between an upper part of an actuating arm provided at a lower part of an actuating shaft and a corner part of a cover. The stop lamp switch according to item (1).