JPS6075770A - Structure of electric-current sensor in timing light for car - Google Patents

Abstract

PURPOSE:To facilitate the setting of an electric-current sensor for detecting the pulse current of a distributor which is installed in demountable ways at one edge of the case of a timing light by forming said electric-current sensor from two parts which can be opened freely each other and in which divided cores can be accommodated. CONSTITUTION:An electric-current sensor 20 is installed in demountable ways onto a cover part at one edge of the case 10 of a timing light, and a slidable case 30 having a condenser lens 32 for discharge tube fixed is installed in slidable ways onto the other edge side of the case 10. A discharge tube 40, luminous circuit, and a battery 70 are accommodated into the case 10, and the electric-current sensor 20 and the luminous circuit are connected through a cord 50. The electric-current sensor 20 is constituted of a lower member 22 having a U-shaped core 22c and a turning arm 21 which has an I-shaped core 21c and is turnable around a turning shaft 22a, in the upper part of the lower member 22, and the lower member 22 and the turning arm 21 are urged in the direction of opening by a spring 24. The both 21 and 22 can be held in closed state by the engagement by the projection 23a of a push button 23 of a hook 21a installed onto the turning arm 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention involves synchronizing a pulsed current directed to a spark plug and causing a discharge tube to emit light in order to check whether the ignition timing of an automobile engine is appropriate. Regarding equipment.

``Background Art'' To inspect the ignition timing of an automobile engine, an arrow is drawn on the circumference of a pulley that interlocks with the engine's crankshaft, and a fixed mark is placed around the pulley. Then, while the engine is being rotated, the light emitted from timing lines 1 to 1 is irradiated.

If the ignition timing is appropriate, the arrow points to a predetermined mark, and if the ignition timing is inappropriate, the arrow points to a position other than the predetermined mark.

Therefore, it is possible to determine whether the ignition timing of the engine is appropriate or inappropriate depending on the position pointed by the above arrow.

By the way, the current sensor used in conventional timing lights for automobile engines has two electrodes, and the cord going to the automobile's spark plug can be sandwiched between the two electrodes. It uses electric induction. That is, the distance between the two electrodes is first set slightly wider, and after the cord is sandwiched, the distance between the electrodes is gradually narrowed.

“Problems with the background technology” In the above conventional example, the setting operation of the current sensor is complicated;
There is a problem in that current pulses cannot be detected accurately depending on the current state.

That is, since the above conventional example utilizes electrostatic induction, it is susceptible to electrical noise due to current pulses of codes other than the code to be tested.

This electrical noise causes the timing light to malfunction. Therefore, a circuit configuration that avoids the influence of the electrical noise described above is required.

``Object of the Invention'' The present invention has been made by focusing on the above-mentioned problems of the conventional technology.
- The object of the present invention is to provide a current sensor for use in the present invention.

"Summary of the Invention" In order to achieve the above object, the present invention includes a type 1 core, a first case housing the I type core, and a U-shaped core that cooperates with the ■ type core to form a closed magnetic path. a second case that accommodates the U-shaped core; a pivot joint that pivotally connects the first and second cases to each other; a spring that opens the first and second gates to each other; The engaging portions that engage the cases with each other constitute a current sensor in a timing light for an automobile engine.

Embodiment of the Invention FIG. 1 is a plan view of a timing light showing an embodiment of the invention, and FIG. 2 is a front view of the timing light. A push button 11 is provided on the outer periphery of the case 1o,
A current sensor 2o is attached to the lid portion at the right end of this case 1o.
is removably provided. This current sensor 2o is
This detects a pulse current directed to a spark plug (not shown).

Figure 3 is a cross-sectional view taken along the line mm in Figure 2, and Figure 4 is a cross-sectional view taken along line T in Figure 1.
It is a V-IV sectional view.

A small diameter portion 13 is provided on the left side of the case 10, and a sliding case 30 that slides on the small diameter portion 13 while covering the small diameter portion 13 is attached. This sliding case 30 is made of an elastic material such as synthetic resin.

A discharge tube 40, a cord 50, a light emitting circuit 60, and a battery 70 are built into the case 10.

The discharge tube 40 includes a reflective mirror 41 and a transparent proteraphter 43.
A cover plate 42 is fixed behind the cover plate 42, and the emitted light is reflected by a reflecting mirror 41 having a parabolic curved surface.

The cord 50 connects the current sensor 20 and the light emitting circuit 60, and is housed in the cord space 14 provided within the case 10. And that code is 50
is formed in a spiral shape.

The light emitting circuit 60 is a circuit that causes the discharge tube 40 to emit light in synchronization with the generation of the pulse current when the current sensor 20 detects a pulse current directed toward the ignition plug, and is composed of components such as a transformer 62. There is. Note that the reference numeral 61 is a connector.

Further, the battery 70 is connected to a battery space 15 in the case 10.
For example, a small AA battery is used.

A condensing lens 32 for a discharge tube is fixed within the left end of the sliding case 30, and this condensing lens 32 is formed to move as the sliding case 30 slides.

FIG. 5 is a cutaway front view showing the current sensor 20 alone, and corresponds to the right side view of FIG. 2. This Vf
A cross-sectional view taken along the line '-Vl is shown in FIG. 6, and a cross-sectional view taken along the line ■--■ in FIG. 6 is shown in FIG.

The current sensor 20 includes a lower part 22 and a rotating arm 21 that rotates around a rotating shaft 22a provided in the lower part 22. The rotating arm 21 is provided with a claw 21a and an I-shaped core 21C. At the bottom 22, push button 2
3, a U-shaped core 22C, and a spring 22d that applies an upward force to the U-shaped core 22C. The vertical cross section of the push button 23 has protrusions 23a and 23b as shown in FIG. 6, and the horizontal cross section thereof has a ring shape with four parts 23c and a space 23d, as shown in FIG. ing. The protrusion 23a engages with the claw 21a to prevent the rotating arm 2 from opening.

Further, a spring 24 is provided inside the lower part 22, one end 24a of which contacts the inner surface of the rotating arm 21, and the other end 24b.
is in contact with the spherical protrusion 23b of the push button 23. Other end 24
When b presses the spherical protrusion 23b, the spring 24
is designed to press the center part of the push button 23.

A coil (not shown) is wound around the U-shaped core 22C,
This coil is connected to a cord 50.

Further, a push button switch 1.1a is provided below the push button 11, and this switch lla is a power switch for the light emitting circuit 60. When the current sensor 20 electromagnetically detects a pulse current, the discharge tube 40 starts discharging.
Only after pressing the push button switch lla does the discharge tube 40 discharge in synchronization with the current pulse.

FIG. 8 shows a state in which the sliding case 30 is slid from the case 10 and a part of the case 10 is omitted. When the sliding case 30 is slid to the left in this manner, the emitted light from the discharge tube 40 is narrowed down, so that the reflected light from the irradiated surface becomes stronger. In other words, the illuminated surface becomes brighter. 9th
The figure is an exploded view of the sliding case 30 and the light emitting section including the discharge tube 40.

Next, the operation of the above embodiment will be explained.

First, if a timing light is not used, as shown in Figures 1 to 4, space 14.1 of case 1o.
A spiral cord 50 and a battery 70 are housed in the case 1o, and a lid-shaped current sensor 20 is attached to the right end of the case 1o.The sliding case 30 is housed in the innermost part of the case 10. It is being

Therefore, the cord 50 is not exposed as in the conventional case, making it convenient to carry.Also, since the case 10, which is the main body of the timing light, and the current sensor 20 are paired, when moving it, it is convenient to carry. It is the same as moving the case, and from this point of view it is also highly portable.

Next, to use the timing light, as shown in FIG. 8, slide the sliding case 30 with respect to the case 10 to the left in the figure. By doing this, the emitted light from the discharge tube 40 is narrowed down, so that even if the amount of emitted light is smaller than before, the brightness on the irradiated surface will not decrease. That is, even a battery 70 with a small capacity can emit light for a long time, and therefore a small battery 70 can be used.

Further, in order to detect current pulses from a cord directed to a spark plug of an automobile, the current sensor 20 is removed from the case 10. Then, push button 23 is pressed. As a result, the push button 23 moves to the left in FIG. 6, so the protrusion 23a
The engagement with the claw 21a is released, and the rotating arm 21 is rotated counterclockwise by the spring 24. Therefore, a cord destined for an automobile's spark plug can be easily inserted into the space 22e of the lower part 22 between the legs of the U-shaped core 22c. Next, when the rotating arm 21 is pressed downward, the claw 21a engages with the protrusion 23a. As a result, the ■-shaped core 21C and the U-shaped core 22C form a closed magnetic path.

Therefore, simply by pressing the push button 23 and closing the rotary arm 21 and the lower part 22, the setting operation of the current sensor 20 is completed, so these operations can be performed with one hand, and the sensor 1-operation is not performed. It has the advantage of being very easy to operate. Further, since the I-shaped core 21C and the U-shaped core 22c reliably form a closed magnetic path, there is an advantage that the pulse current directed toward the spark plug can be reliably detected.

Note that the relationship between the rotating arm 21 and the lower part 22 can be reversed, and the rotating arm 21 is expressed as a first case that accommodates an I-shaped core, and the lower part 22 is expressed as a second case that accommodates a U-shaped core. can do. Also, instead of the rotation shaft 22a, the first.
Any other member may be used as long as it is a pivot joint that pivotally connects the two cases to each other. In place of the claw 21a and the push button 23, other members may be used as long as they are engaging parts that engage the first and second cases with each other.

"Effects of the Invention" As described above, the present invention has the advantage that the current sensor operation is easy and the detection by the current sensor is accurate.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a timing light showing an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a sectional view taken along the line IV--II of FIG. 1, and FIG. IV sectional view, FIG. 5 is a partially cutaway front view of the current sensor, and FIG. 6 is Vl − of FIG. 5.
VT sectional view, Fig. 7 is a cross-sectional view taken along the line ■-■ in Fig. 6, Fig. 8 is a front view when the sliding case is slid, and Fig. 9 is a diagram showing the relationship between the sliding case and the light emitting part including the discharge tube. It is an exploded view. DESCRIPTION OF SYMBOLS 10... Case, 20 River current sensor, 21... Rotating arm, 21a... Claw, 21c... I-type core, 22...
- Lower part, 22a...Rotation axis, 22c...U-shaped core, 22d...Spring, 22e...Space, 23...Push button, 23a...Protrusion, 23b...Spherical protrusion , 23c
...Space, 23d...Recess, 24...Spring, 24
a...One end, 24b...Other end, 3°...Sliding case, 40...Discharge tube, 41...Reflector, 50...
Code, 60...Light emitting circuit, 7o...Battery Patent applicant Hiroharu Koike, Patent attorney representing Kowa Seiki Co., Ltd.

Claims (1)

[Claims] a current sensor that detects a pulsed current flowing from a distributor to a spark plug; a light-emitting circuit that causes a discharge tube to emit light when the current sensor detects the pulsed current; and a cord that connects the current sensor and the light-emitting circuit; A timing light for an automobile having a battery includes a type 1 core, a first case housing the ■ type core, and the above-mentioned ■
A U-shaped core that cooperates with the mold core to form a closed magnetic path, a second case that houses the U-shaped core, a pivot joint that pivots the first and second cases together, and the first A structure of a current sensor in a timing light for an automobile engine, characterized in that the current sensor is constituted by a spring that opens the two cases together, and an engaging portion that engages the first and second cases with each other.