JPS6321473Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sensor that detects the rotational direction of a handle.

A turn signal switch device for an automobile is closed when a lever is manually rotated, and opened when the handle is reversed and the lever is automatically returned to a neutral position. In other words, since this type of switch controls opening and closing by mechanically releasing the operating lever of the switch by rotating the handle, the mounting position of the switch is limited to the area around the handle shaft, which makes the design difficult. There is little freedom in

Incidentally, in recent years, there has been a demand for a new conceptual change in the design of automobile instrument panels, and it has also become necessary to increase the degree of freedom in the mounting position of direction indicating switches. That is, there is a need for a direction indicator switch that can be electrically held and electrically released. However, one of the things that makes it difficult to realize the electrical direction switch described above is the need for a sensor that electrically detects the rotation of the handle and detects the direction of rotation of the handle in order to release the electrical hold on the switch. be.

This idea was made in view of the points mentioned above.
The purpose is to provide a rotational direction detection sensor that does not generate intermittent noise because it is constantly sliding, has a simple structure, can be miniaturized, and is free from failure.

Another object of this invention is to provide a rotation direction detection sensor that can detect the rotation direction and rotation angle by simply adding a movable contact of the rotor.

Next, one embodiment of this invention will be described with reference to the drawings. 1 is a handle, 2 is a shaft that rotates as the handle 1 rotates, and 3 is a fixed part (not shown) such as a housing arranged around the outer circumference of the shaft 2.
The shaft 2 is inserted into the cylindrical portion 3a of the cylindrical mounting case with a bottom. A protrusion 3b is formed at two opposing locations on the edge of the mounting case 3, and a long groove 3c in the circumferential direction is formed on the circumferential side directly below the protrusion 3b. 4 is a spring fitted into the outer periphery of the cylindrical portion 3a of the mounting case 3;
5 is similarly fitted into the outer periphery of the cylindrical portion 3a, and the lower end flange 5
A is a cylindrical stay placed on the spring 4, and a recess 5b is formed in opposing portions of the inner circumferential surface of the stay. Reference numeral 6 designates a base that is fitted into the cylindrical portion of the stay 5, and protrusions 6a formed at two opposing locations are fitted into the long grooves 3c of the mounting case 3, so that it is free to move only in the vertical direction. Therefore, when the stay 5 is pushed up by the spring 4, the base 6 is also pushed up by the height of the long groove 3c. Further, in the part where one of the protrusions 6a of the base 6 is formed, two fixed contacts 6b, 6b', 6c, 6 are arranged in two rows in the radial direction.
c′ is formed. Reference numeral 7 designates a rotational direction determining plate placed on the upper edge of the mounting case 3, and has a notch 7a facing each other into which the projection 3b is inserted. Note that the length of this notch 7a is formed to be larger than the width of the protrusion 3b, so that it can be displaced in the rotation direction. Further, elastic contact plates 7b, 7b', 7c, and 7c' are attached to the upper and lower surfaces of the portion where one notch 7a is formed of the discrimination plate 7, and the contact plates 7b, 7c, and 7b' It is electrically connected to 7c'. Reference numeral 8 is arranged on the upper surface of the discrimination plate 7, and the protrusion 8a is a rotor fitted into the small hole 1a of the handle 1, and a hanging piece 8b fitted into the recess 5b of the stay 5 described above is located below the center hole. It is formed. Also, on the lower surface of the rotor 8, there is one or more movable contacts 8c (two in the figure).
installed. Further, a pressing piece 8d is formed on the outer circumferential portion of the rotor 8 in the same direction as the hanging piece 8b, and this presses the outer circumferential surface of the discrimination plate 7.

When the rotor 8 is rotated, for example, clockwise by rotation of the handle 1, the stay 5 is rotated. Further, since the stay 5 is pushed up by the spring 4 and pressed against the discrimination plate 7, the discrimination plate 7 also moves in the direction of rotation of the handle 1 by the amount of the gap between the notch 7a and the protrusion 3b of the mounting case 3. It is rotated by the sliding resistance between the discrimination plate 7 and the recess 5b and the discrimination plate 7. The contact plates 7b, 7b' therefore come into contact with the stationary contacts 6b, 6b'. In this state, the notch 7a of the discrimination plate 7 comes into contact with the protrusion 3b, so the rotation of the discrimination plate 7 is stopped. When the handle 1 is further rotated, the rotor 8 continues to be rotated, so that the movable contact 8c is connected to the contact plate 7 of the discrimination plate 7.
c, 7c'. Therefore, the fixed contacts 6b, 6
Between b', movable contact 8c, contact plate 7c, 7c' and 7
b, 7b and are short-circuited.

Next, when the handle 1 is rotated in the opposite direction after turning to the right, the discrimination plate 7 is rotated counterclockwise via the rotor 8 and the stay 5, and stops when the notch 7a comes into contact with the protrusion 3b. At this time, the contact plates 7b, 7b' come into contact with the fixed contacts 6c, 6c' of the base 6, and when the rotor 8 is further rotated by reverse rotation of the handle 1, the movable contact 8c comes into contact with the contact plates 7c, 7c'. do. Therefore, the fixed contacts 6c and 6c' are short-circuited.

Note that the short-circuiting between the fixed contacts 6b and 6b' due to the leftward and rightward rotations of the handle 1 is also the same operation as described above, so a description thereof will be omitted.

In addition, by increasing the number of movable contacts 8c of the rotor 8, the fixed contacts 6b, 6b' or 6c, 6c' can be closed at a small rotation angle, so by counting the number of closed contacts, the rotating It is possible to detect not only the direction but also the rotation angle.

Next, using the rotation direction detection sensor described above,
The operation of canceling a direction indicator light in an automobile will be explained with reference to FIGS. 4 and 5. Note that the fixed contact 6 is closed by rotating the handle 1 to the right (clockwise).
b, 6b', a switch consisting of contact plates 7b, 7b', 7c, 7c' and a movable contact 8c, S _R , a fixed contact 6c, which is closed by rotating it to the left (counterclockwise);
6c', contact plates 7b, 7b', 7c, 7c', and a movable contact 8c are referred to as S _L.

In FIG. 4, reference numeral 9 indicates a left and right turn signal latch circuit 1 which intermittents a signal from a predetermined DC power source.
This is a turn signal flasher that supplies signals 0 and 10'. The latch circuits 10, 10' turn on the switches 10a, 10'a when a signal is supplied from the momentary turn signal switch _S1 , and keep the switches 10a, 10' on until a release signal is supplied from the OR circuit 11, 11'. hold a. switch 1
The intermittent signals from 0a and 10'a cause the left and right direction indicator lights L ₁ and L ₂ to blink. The sequence discriminating circuit C supplied with signals from the switches S _L and S _R supplies its output to the OR circuits 11 and 11'. OR circuit 11,1
A signal is also applied to the switch 1' from the cancel switch _S2 . FIG. 5 is a block diagram of the order discriminating circuit C, which is composed of four delay type flip-flops F ₁ to F ₄ , an OR circuit 12 , and a monostable multivibrator 13 .

Next, its operation will be explained. When the switch _S1 , which is always located at the neutral point N by a spring or the like, is manually pushed to the R side, a signal is applied to the latch input terminal of the latch circuit 10', and the switch 10'a is turned on and latched. Therefore, an intermittent signal is supplied from the flasher 9, and the right direction indicator light _L2 blinks.
Even if switch S ₁ returns to neutral point N, switch 1
Since 0'a is latched, the direction indicator light _L2 continues to flash. When Switch S ₁ is turned to the R side,
The OR circuit 11 outputs a release signal and switches the switch 10.
Release the latch a. Therefore the left turn signal
Even when L ₁ is blinking, the left direction indicator L ₁ goes out when the right direction indicator L ₂ starts blinking. To turn off the right direction indicator light _L2 , turn on the normally open switch _S2 manually. At this time, since a signal is applied to the OR circuit 11', a release signal is supplied to the latch circuit 10', and the switch 10'a is
The latch is released.

The operation of blinking and turning off the left turn signal light L ₁ is similar to the operation of blinking and turning off the right turn signal light L ₂ described above.

Next, we will explain how to automatically turn off the right direction indicator L ₂ by operating the reverse steering wheel after completing a right turn when switch S ₁ is manually moved to the R side. ₁
The operation of automatically turning off the left turn signal light _L1 by turning the wheel to the L side and operating the reverse steering wheel after turning to the left is the same, so here we will only explain how to turn off the right turn signal light _L2 . do).

Flip the switch S ₁ to the R side and turn on the right direction indicator L ₂
After flashing, turn handle 1 to the right and switch S _R will turn on several times, but or gate 1
The b terminal of 1' remains at a low level (hereinafter referred to as L) and does not release the latch circuit 10'.

By operating the reverse rotation handle after turning right,
This time the switch S _L is turned on. At this time, a release input is input to the latch circuit 10', and the direction indicator light _L2 stops blinking.

As mentioned above, this design has a discrimination plate that is always in plane contact with the stay that rotates with the handle, so there is no intermittent sound when the handle is rotated, and the structure is simple and compact. In addition to being easy to use and free from the risk of failure, by increasing the number of movable contacts on the rotor, it is possible to detect not only the direction of rotation but also the rotation angle of the handle.

[Brief explanation of drawings]

The figures show one embodiment of the rotational direction detection sensor according to this invention, in which Fig. 1 is an exploded perspective view, Fig. 2 is a cross-sectional view of the sensor installed on the handle shaft, and Fig. 3 shows the operating state of the main parts. The explanatory perspective view, FIG. 4, is a circuit diagram for controlling the direction indicator light. 1...Handle, 3...Mounting case, 5...Stay, 6...Base, 6b, 6b', 6c, 6c'...
...Fixed contact, 7...Discrimination plate, 7b, 7b', 7c,
7c'...Contact plate, 8...Rotor, 8c...Movable contact.

Claims (1)

[Claims for Utility Model Registration] At least one movable contact is formed on a surface facing a rotation direction discrimination plate described later, and is formed on a rotor that rotates as the handle rotates, and on a fixed member such as a mounting case. A pair of notches are formed that are wider than the width of the protrusion to be engaged with the protrusion, are attached to the fixed member so as to be rotatable within a certain range, and are in contact with the movable contact on one side. a rotational direction determining plate having a contact member formed on the other surface thereof with a pair of contact members electrically connected to each of the contact members; a base on which two sets of fixed contacts are formed, which are alternately contacted according to the rotation direction of the pair of contact members formed on the other surface and the rotation direction discrimination plate; and with respect to the rotation direction discrimination plate. A rotational direction detection sensor comprising: frictional force applying means for applying a frictional force so that the rotor rotates within the predetermined range as the rotor rotates.