JPS6213008Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improved structure of a speed warning device, for example, a speed warning device for issuing a warning to a driver when the traveling speed of an automobile, motorcycle, etc. reaches a predetermined value.

In recent years, improvements in the performance of automobiles, motorcycles, etc. have enabled them to run at high speeds, which can also lead to extremely dangerous situations.

In addition, motorcycles (motorized bicycles) are particularly dangerous, and there is a movement toward legislation requiring speed warning devices. Alternatively, a chime or the like is sounded to give a warning to the driver.

Conventionally, in this type of warning device using a mechanical operation, a disc having a conductive part is disposed on the indicator side of the speedometer mechanism, as disclosed in Japanese Utility Model Publication No. 38-17781, and this disc has a conductive part. A speed warning device has been proposed in which a warning is displayed by contacting a conductive portion of a disk with a contact portion of the disk at all times.

However, in the speed warning device described above, it is difficult to set the position of the speed warning point.

This invention is intended to solve the above problems, and aims to provide a speed warning device that is easy to assemble and can suppress the swinging of the hair spring. A rotary shaft that transmits the rotational drive of a rotatably pivoted vehicle, a pointer shaft that is disposed inside the machine frame and that angularly displaces in proportion to the rotational speed of the rotary shaft, and rotation of this pointer shaft. a conductive speed setting plate for setting an alarm speed, which is disposed in electrical contact with the pointer shaft and has an arcuate protrusion centered on the pointer shaft; and the speed setting plate. an insulating cylindrical collar that is fixed to the pointer shaft in a substantially concentric shape with the arc-shaped protrusion of and has a concave portion for arranging the speed setting plate in a non-rotating state; a conductive contact elastic plate that is fixed and resiliently contacts the side circumferential surface of the protrusion of the speed setting plate or the side circumferential surface of the collar, and is formed integrally with the collar and suppresses swinging of the hair spring. It consists of a rocking prevention plate.

Next, an embodiment based on the above characteristics will be described with reference to the accompanying drawings.

In Figures 1 to 4, reference numeral 1 indicates an eddy current type speedometer that is installed on a vehicle.A rotating shaft 3 that is rotatably driven in proportion to the vehicle speed is pivotally attached to the frame 2 of the speedometer 1. , a magnet 4 is fixed to the upper end of this rotating shaft 3,
A guiding plate 6 is fixed to the pointer shaft 5 with a small gap between the magnet 4 and the pointer 7 at the upper end of the pointer shaft 5.
is fixed. Further, one end of a hair spring 8 is fixed to the pointer shaft 5, and the other end is fixed to the machine frame 2 side of the instrument. Therefore, when the rotary shaft 3 is driven to rotate in proportion to the vehicle speed, an eddy current is generated in the guide plate 6 due to the rotation of the magnet 4, and a rotational torque proportional to the rotation speed of the rotary shaft 3 is obtained in the guide plate 6. The pointer shaft 5 rotates together with the guide plate 6 to a position where the rotational torque and the elasticity of the hair spring 8 are balanced,
The running speed of the vehicle is measured by comparing and reading the indicated value of a pointer 7 attached to the upper end of the pointer shaft 5 with an indicating scale (not shown) on a dial plate 9.

Further, on the side of the pointer shaft which angularly displaces in proportion to the rotational speed of the rotating shaft 3, there is a conductive speed setting plate 10 for setting an alarm speed having an arcuate protrusion 10a centered on the pointer shaft 5. A notch 1 that is press-fitted into the arcuate projection 10a and that can be engaged with the arcuate protrusion 10a.
1a, an insulating cylindrical collar 11 having a speed setting plate fitting recess 11b is press-fitted into the pointer shaft 5, and the fitting recess 1 of the cylindrical collar 11 is press-fitted into the pointer shaft 5.
A speed setting plate 10 is fitted to each of the needles 1b and fixed to the pointer shaft 5, respectively.

Further, the cylindrical collar 11 has this collar 1.
An adjustment section 12 consisting of a pair of flat surfaces is integrally provided to enable adjustment of the warning speed by rotating the adjustment section 1.

Further, a conductive contact elastic plate 13 that elastically contacts the side circumferential surface of the speed setting plate 10 having the arc-shaped protrusion 10a or the side circumferential surface of the cylindrical collar 11 is connected to the machine frame via an insulating member 14. It is fixed at 2. Further, a plate-shaped rocking prevention plate 15 is formed integrally with the collar 11, and is disposed with a gap between the hairspring 8 and suppresses the rocking of the hairspring. Further, the alarm speed range can be freely set by changing the angular width of the arcuate protrusion 10a of the speed setting plate 10. Further, it is preferable that the diameters of the collar 11 and the speed setting plate 10 are approximately the same.

When the rotating shaft 3 rotates in proportion to the vehicle speed, the rotation of the magnet 4 causes the pointer 7 to follow the guide plate 6 formed in the speedometer mechanism to a position commensurate with the vehicle speed, indicating the traveling speed. At this time, with the elastic contact plate 13 in elastic contact with the side peripheral surface of the cylindrical collar 11, that is, with the alarm circuit open, the pointer 7 follows and indicates the traveling speed, but the vehicle speed is not regulated. When the speed reaches the alarm speed or higher, the contact elastic plate 13
contacts the arc-shaped protrusion 10a of the speed setting plate 10 and conducts, and the battery 16, the contact elastic plate 13, and the machine frame 2
A warning circuit consisting of a warning indicator 17 such as a buzzer and lamp is closed and the warning indicator 17 is activated to warn the driver that the vehicle speed has reached the warning speed or higher.

In this case, the contact elastic plate 13 is always in stable contact with the side circumferential surface of the cylindrical collar 11 or the side circumferential surface of the arc-shaped protrusion 10a formed on the speed setting plate 10 with an appropriate contact pressure. It is also possible to suppress the chattering phenomenon and the resonance phenomenon of the contact elastic plate 13. Furthermore, the vertical amplitude of the hairspring 8 can be regulated by the rocking prevention plate 15, thereby preventing an adverse effect on the operation of the pointer 7 fixed to the pointer shaft 5, which is the indicating side. and can measure the stability of instructions. Further, the speed setting plate 10 is fitted into the fitting recess 11b of the cylindrical collar 11, and the arcuate protrusion 10a is inserted into the fitting recess 11b.
It is easy to assemble because it engages with the notch 11a of the collar 11, and the speed setting plate 10 can be made to work together by rotating the collar 11 using the adjustment part 12 provided integrally with the collar 11. The alarm speed can be easily adjusted. Furthermore, since the anti-swing plate 15 is integrally formed with the collar 11, the anti-sway plate 15 can be assembled at an appropriate position at the same time as the speed setting plate 10 and collar 11 are assembled, making assembly easy. The structure is simple without unnecessarily increasing the number of parts. In addition, in the above-mentioned embodiment, the buzzer is activated at the time of alarm.
Although the warning indicator 17, such as a lamp, is always in operation, it may be provided with a separate mechanical means or electrical means to display a warning intermittently.

FIG. 5 shows another embodiment of the eddy current type speedometer installed in a vehicle, and the same or equivalent parts as in the above embodiment will be described with the same reference numerals.

A rotating shaft 3 that is rotatably driven in proportion to the vehicle speed is pivotally mounted on the machine frame 2 of the speedometer 1. A magnet 4 is fixed to the upper end of the rotating shaft 3, and a magnet 4 is connected to the pointer shaft 5 through a small gap between the magnet 4 and the rotating shaft 3. A fixed cup-shaped guide plate 6a is disposed, and the cup-shaped guide plate 6a is externally fitted onto the magnet 4, and a pointer 7 is fixed to the upper end of the pointer shaft 5. Also,
One end of a hair spring 8 is fixed to the pointer shaft 5,
The other end is fixed to the machine frame 2 side of the instrument. Therefore, when the rotating shaft 3 is driven to rotate in proportion to the vehicle speed, the cup-shaped guide plate 6a is rotated by the rotation of the magnet 4.
An eddy current is generated in the guide plate 6a, and a rotational torque proportional to the rotation speed of the rotating shaft 3 is obtained on the guide plate 6a.
With a, the pointer shaft 5 rotates to a position where the rotational torque and the elasticity of the hair spring 8 are balanced, and the indicated value of the pointer 7 attached to the upper end of the pointer shaft 5 is compared with the indicated scale (not shown) on the dial plate 9. As in the embodiments shown in FIGS. 1 to 4, when the vehicle speed reaches a predetermined warning speed or higher, the contact elastic plate 13 sets the speed. The contact elastic plate 13 contacts the arcuate protrusion 10a of the plate 10 to close the alarm circuit and issue a warning.
The hair spring 8 is always in stable contact with the side circumferential surface of the arcuate protrusion 10a of 0, and the hair spring 8 is also regulated by the rocking prevention plate 15.

As described above, the present invention includes a rotary shaft that transmits the rotational drive of a vehicle which is rotatably pivoted to the machine frame of an instrument, and a rotary shaft that is arranged inside the machine frame and that is angular in proportion to the rotational speed of the rotary shaft. A displaceable pointer shaft, a hair spring that controls the rotation of the pointer shaft, and an alarm speed setting device that is arranged in contact with the pointer shaft so as to be energized and has an arcuate protrusion around the pointer shaft. an electrically conductive speed setting plate; and an insulating material having a recess formed therein, which is fixed to the pointer shaft in a substantially concentric circle with the arc-shaped protrusion of the speed setting plate, and allows the speed setting plate to be placed in a non-rotating state. a cylindrical collar; a conductive contact elastic plate fixed to the machine frame and elastically abutting against the side circumferential surface of the protrusion of the speed setting plate or the side circumferential surface of the collar; and integral with the collar. Since it is formed with a rocking prevention plate that suppresses the rocking of the hair spring, it is easy to assemble, and stable contact pressure can be obtained at all times.In addition, by suppressing the rocking of the hair spring, The stability of the instructions can be measured by Further, by integrally forming the collar and the anti-swing plate 15, the component configuration can be simplified.

[Brief explanation of the drawing]

Figure 1 is an overall structural diagram of the device of the present invention, Figure 2 is a perspective view of the main parts of the same, Figure 3 is an exploded perspective view of the same, and Figure 4 is an exploded perspective view of the same.
Figure A is a plan view showing the operating state of the speed setting plate;
Figure B is a partially cutaway perspective view of the bottom of the speed setting plate, and Figure 5 is an overall structural diagram of another embodiment. 2... Machine frame, 3... Rotating shaft, 5... Pointer shaft, 1
0...Speed setting plate, 10a...Circular protrusion, 11
... Collar, 11a ... Notch, 11b ... Fitting recess, 12 ... Adjustment section, 13 ... Contact elastic plate, 1
5... Rocking prevention plate.

Claims (1)

[Scope of utility model registration request] a rotary shaft rotatably pivotally connected to an instrument frame for transmitting the rotational drive of a vehicle; a pointer shaft disposed inside the machine frame and angularly displaced in proportion to the rotational speed of the rotary shaft; A hair spring that controls the rotation of the pointer shaft; and a conductive speed setting plate for setting an alarm speed that is disposed in contact with the pointer shaft so as to be energized and has an arcuate protrusion around the pointer shaft. , an insulating cylindrical collar that is fixed to the pointer shaft in a substantially concentric circle with the arc-shaped protrusion of the speed setting plate, and has a recess formed therein to allow the speed setting plate to be placed in a non-rotating state; , a conductive contact elastic plate fixed to the machine frame and elastically abutting against the side circumferential surface of the protrusion of the speed setting plate or the side circumferential surface of the collar; A speed warning device comprising a rocking prevention plate that suppresses rocking.