JPS5826382Y2 - Movable ring type indicator - Google Patents

Description

[Detailed description of the invention] Conventionally, in movable wire type indicating ammeters or voltmeters, etc., a pivot shaft made of special steel such as high carbon steel is fixed to a boss made of aluminum etc. by caulking etc.
The boss was glued to the outer surface of the wire ring and the tip of the pivot shaft was fitted into a bearing stone, or a metal band was used to hold the wire rotatably.

However, the aforementioned pivot shaft is made by cutting a special steel wire to a predetermined length, cutting one end of the wire to form a cone, hardening it, polishing it, and applying chrome plating to prevent rust. Because of this, the machining process was extremely complicated and productivity was low, and the bearing stones were sometimes damaged by the impact.

Furthermore, there were drawbacks such as the fact that the pivot shaft was magnetized, which affected the rotational torque of the wire ring, which could cause the sensitivity of the instrument to go out of order.

Furthermore, tension band type instruments require precious metals such as platinum-iridium alloy for the tension band, and the tension must be precisely adjusted, so they have drawbacks such as not being able to be manufactured efficiently.

The present invention provides a movable wire type indicating instrument that does not have the above-mentioned drawbacks.

Fig. 1 is a side view of the embodiment of the present invention, Fig. 2 is a vertical sectional view of a part of Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a sectional view of Fig. 2. FIG. 3 is a plan view with the bearing removed.

As described above, the plate-shaped base part 1 and the pivot shaft 2, which projects at right angles from the center of the base part and has a conical tip, are integrally molded from a suitable synthetic resin.

In addition, on both sides of the base part 1, plate-like legs 3, 3 are formed that protrude in the opposite direction to the pivot shaft 2, and as shown by the chain line in FIG. Protrusions 4°4 are provided.

By fitting the legs 3, 3 described above to both sides of the movable wire ring 5, and applying adhesive 6 between the base portion 1 and the outer surface of the wire ring as necessary, the two pivot shafts are attached. It is fixed symmetrically to the outside of the rectangular frame wire ring.

Further, a hole is provided in the plate-like portion at the base of the pointer 70, and the hole is connected to the pivot shaft 2 and the protrusion 4 on one base portion 1.
4, heat and soften the protrusion, and press it to deform it into a hemispherical shape, thereby fixing the pointer.

Such a movable wire ring 5 is fitted into the magnetic steel core 8, and the frame 9
The wire ring 5 is rotatably held by fitting the tip of the pivot shaft 2 into synthetic resin pivot bearings 10 and 11 attached to the shaft.

The inner ends of control spiral springs 12 and 13 are tied to the pivot shaft, and both ends of the wire are connected to these springs.

Further, in the above embodiment, the legs 3, 3 are provided on the base part 1, but
If you fix it with adhesive, you can also omit this leg.

As described above, in the present invention, the pivot shaft and the base portion for fixing the pivot shaft to the outer surface of the wire ring are integrally formed of synthetic resin.

Therefore, an inexpensive instrument can be obtained in which the number of required parts is small, and the manufacturing and assembly of the wire ring support section is extremely simple.

Moreover, there is no fear that the magnetization of the pivot shaft will cause sensitivity to go awry or that the bearing stone will be damaged by impact.

[Brief explanation of drawings]

Fig. 1 is a side view of the embodiment of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of a part of Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a cross-sectional view of Fig. 2. FIG. 3 is a plan view of the portion excluding the bearing. In the figure, 1 is a base, 2 is a pivot shaft, 3 is a leg, 4 is a protrusion, 5 is a wire ring, 6 is an adhesive, 7 is a pointer, 8 is a magnetic steel core, 9 is a frame, 10, 11 is a pivot bearing, 12
13 is a spiral control spring.

Claims (1)

[Scope of utility model registration request] A plate-shaped base part and a pivot shaft having a conical tip protruding at right angles from the base part are integrally formed of synthetic resin, and the base part is fixed to the outer surface of the movable wire ring. A movable wire ring type indicating instrument in which the wire ring is rotatably held by fitting the pivot shaft into a pivot bearing attached to a frame.