JPS6020008Y2 - Instrument zero adjustment device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a zero adjustment device for a meter such as a wide-angle meter in which the movable element axis and the rotation center of the zero adjustment device are concentric.

FIG. 1 is an explanatory diagram of the main part of a wide-angle meter using a conventional zero position adjustment device.

In FIG. 1, 10 is a front cover of the instrument, 20 is a zero position adjustment device, and 30 is a control mechanism for the internal instrument.

The front cover 10 is made of transparent plastic, and a spiral-shaped jagged part 11 is formed on the back side of the central part, and this jagged part is translucent.

This notch is formed to hide the military control mechanism 30 portion of the instrument internal device from being seen from the outside of the cover 10.

In the zero position adjustment device 20, 21 is a military element, 22 is a disc spring, and 23 is a U-shaped engagement piece made of metal.

The military control element 21 has a through hole 1 formed in the center of the cover 10.
2, and the engagement piece 23 is fitted from the back side of the cover via the disc spring 22, and this engagement piece and the military control element 21 are inserted into the cover.
Ultrasonic welding (plastic weld) with the tip 24 of
Alternatively, by caulking the retaining piece 23, the engaging piece 23
is attached to the military control element 21.

Thus, the military control element 21 is crimped and fixed to the cover 10 so as to be rotatable.

In the internal instrument control mechanism 30, 31 is a boss stopper.

The boss stopper 31 is formed of a cylindrical body with a T-shaped cross section, and cutouts 32 and 33 are formed in both arms in the length direction.

Both legs of the engagement piece 23 of the zero position adjustment device 20 are engaged with the notches 32 and 33.

The boss stopper 31 has a body portion 34 rotatably crimped and fixed to a fixing member 35 of the meter internal device.

40 is a boss to which a movable element consisting of a movable coil, a pointer, etc. (both not shown) is attached; 41 is a tension spring attached to the top of the boss stopper 31; 42 has one end connected to the tension spring 41 and the other end movable. This is a tension band attached to the boss 40 of the element.

When the current to be measured is supplied to the movable coil, the movable element consisting of the movable coil, the pointer, the movable part boss 40, etc.
Rotate around the axis.

The zero position adjustment device 20 is arranged so that its center of rotation is concentric with the tension band 42 which is the axis of the movable element, and both legs of the engagement piece 23 are engaged with the grooves 32 and 33 of the boss stopper 31. It has become.

Thus, when the control element 21 is rotated, the engagement piece 23 attached to this element is rotated, thereby displacing the mechanical position of the pointer of the meter and adjusting its zero position.

FIG. 2 is an explanatory diagram of the configuration of the main parts of a wide-angle deformable instrument using the zero position adjustment device according to the embodiment of the present invention.

In FIG. 2, 10 is a cover of the meter, 30 is an inner part of the meter, and 50 is a zero position adjustment device according to the present invention.

Since the cover 10 and the inner device 30 have the same construction as the cover and inner device of the conventional meter shown in FIG. 1, they will be given the same reference numerals as in FIG. 1 and a redundant explanation thereof will be omitted.

The entire zero position adjustment device 50 is integrally formed using a plastic mold, and FIG. 3 shows a view from the direction of the arrow Y in FIG. 2, and FIG. 4 shows a perspective view of only the zero position adjustment device. Shown below.

In the zero position adjusting device 50 shown in FIGS. 2, 3, and 4, 51 is a disk-shaped head whose diameter is larger than that of the through hole 12 formed in the cover 10; A groove 52 is formed in the direction.

Reference numeral 53 denotes a cylindrical body whose diameter is somewhat smaller than the diameter of the through hole 12.

The circumferential surface of this barrel is provided with protrusions 54, 55 for a snap fit in the circumferential direction.

The open end of the body 53 is bifurcated and has legs 56.5.
7 is in full force.

As shown in FIG. 4, the torso 53 excluding the legs 56 and 57.

The wall thickness is thinner than the leg portion 56.57, and
The wall thickness of the body portions 531 to 534 adjacent to the body portions 531 to 534 is further thinned, and these thinner portions make the body portion 53 flexible.

The protrusions 54 and 55 for the snap fit have legs=5.
It is formed in the body part 53 excluding the thick part of 6.57 mm.

As shown in FIG. 2, the zero position adjustment device having such a configuration is inserted into the cover 10 through the through hole 12 formed from the legs 56 and 57 of the device.
Push it into.

In this case, since a portion of the body 53 is thin, the snap fit protrusions 54 and 55 formed on the body 563 are
is inserted into the through hole 12 while being pressed inward by the inner wall of the through hole 12.

Then, when the protrusions 54 and 55 pass through the hole 12, the body 53 expands, and the zero position adjustment device is rotatably held on the cover 10 by the protrusions 54 and 55, and the bracket can be removed from the cover. is prevented.

That is, the zero position adjustment device 50 snaps onto the cover 10.
Fitted.

In this way, the cover 1 with the zero position adjustment device attached
0, the center of the zero position adjustment device 50 coincides with the axis of the movable element of the meter, and the legs 56 and 57 are aligned with the boss stopper 3 of the internal device of the meter.
It is attached to the instrument housing so as to be engaged with a notch 32°) 33 shaped like 1.

Therefore, the groove 5 formed in the head 51 of the zero position adjustment device 50
By inserting a screwdriver or the like into 2 and moving this zero position adjustment device, the mechanical zero position of the pointer of the instrument can be adjusted via the legs 56 and 57.

FIG. 5 is an explanatory diagram of the configuration of another embodiment of the present invention.

In the embodiment shown in FIGS. 2-4, the outer circumferential surface of the body 53 is integral, and the portion 53 adjacent to the legs 56,57
The body portion 53 is made flexible by making the wall thicknesses 1 to 534 thinner.

On the other hand, in the device shown in FIG. 5, grooves are formed in the body parts 535 to 538 adjacent to the legs 56 and 57, and these grooves make the body part 53 flexible. .

Compared to the conventional zero position adjusting device shown in FIG. 1, the device of the present invention shown in FIGS. 2 to 5 has the following effects.

(a) In the present invention, the cover is attached to the cover with a snap fit, so unlike conventional devices in which the military control element and the engagement piece (leg) are configured separately, the cover cannot be attached to the cover by ultrasonic welding or caulking. No installation process is required, reducing manufacturing man-hours.

(b) If ultrasonic welding or caulking is performed after inserting the military structure into the cover, the cover will be damaged, resulting in poor yield.

In contrast, the present invention eliminates such drawbacks.

(c) The device of the present invention, including the part that performs the function of the two-pronged engagement piece of the conventional device, is configured to be integrally molded, so there is no need for a disc spring, and the number of parts can be reduced. .

2) It is possible to reduce costs including (a) to (c).

(Advantages) In the device of the present invention, the tension spring and other parts close to the electric circuit are not metal, which is advantageous in terms of electrical resistance.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the configuration of the main parts of a meter using a conventional zero position adjustment device, Figure 2 is an explanatory diagram of the configuration of the main parts of a meter using the zero adjustment device according to the present invention, and Figure 3 is FIG. 2 is a view seen from the Y direction, FIG. 4 is a perspective view of the zero position adjustment device of FIG. 2, and FIG. 5 is a perspective view of another embodiment of the device of the present invention. 50... Zero position adjustment device, 51... Head, 53... Torso, 56, 57... Legs, 531-534... ...thin part.

Claims (1)

[Claim for Utility Model Registration] The instrument is attached to the front cover of the instrument so that its center of rotation and the axis of the movable element of the instrument are concentric, and is engaged with the military control mechanism of the internal instrument; A zero position adjustment device that adjusts the mechanical zero position of a pointer includes a disk-shaped head having a groove in the diametrical direction, and a snap-fit protrusion on the circumferential surface of the head for snap-fitting the front cover to the front cover. A cylindrical body in which a cylindrical body is formed, and a pair of legs that extend toward the open end side of the body and are engaged with the military control mechanism of the instrument internal device are integrally formed with a plastic mold, and one part of the body is integrally formed. 1. A zero position adjustment device for a meter, characterized in that a thin wall portion or a groove is formed in the axial direction of the body to give flexibility to the body.