JPS6018811Y2 - plunger - Google Patents

Description

[Detailed explanation of the idea] This invention relates to improvements in plungers.

A conventional plunger is shown in FIGS. 1a and 1b.

In the figure, 1 is a U-shaped yoke, 2 is a plate caulked and fixed to the open end of the yoke 1, and 3 is a brass bobbin, on which a coil 4 is wound.

The rear end of this bobbin 3 is fitted into a suction rod 5 which is caulked and fixed to the back of the yoke 1, and the tip is connected to a plate 2.
It is expanded and fixed in the shaft hole 2a of.

A piston 6 is fitted into the bobbin 3.

In addition, this piston 6 is a flange 6a in FIG.
are integrally formed.

Further, 7 is fitted into the recess 6b of the piston 6, and moves back and forth (in the figure, moves left and right) due to suction and discharge of the piston 6.
It is a controlled object.

By the way, in the conventional plunger described above, it is necessary to increase the gap between the shaft hole 2a of the plate 2 and the piston 6, that is, to prevent smoothness from being hindered by friction when the piston 6 reciprocates. , the gap between the two must be increased.

Therefore, when the piston 6 is suctioned, the plate 2 and the piston 6
The drawback was that sufficient adsorption force could not be obtained between the two.

In addition, as shown in Figure 1, when a flange 6a is formed on the piston 6, a gap is created between the outer flange 6a and the plate 2 due to errors in each part, and sufficient suction between the two is not achieved. It also had the disadvantage of not being able to gain power.

Reducing the errors in each component increases manufacturing costs, making the plunger expensive, and in order to obtain a plunger with sufficient suction power, the plunger must be large.

This idea is an attempt to correct the above-mentioned drawbacks. By simply inserting a ring into the piston, large suction and suction forces can be obtained, and therefore, parts do not require much precision and can be manufactured at low cost. Another object of the present invention is to provide a plunger that can be made smaller if it has the same performance as conventional products.

Next, an embodiment of this invention is shown in FIG.

Note that the same reference numerals as in FIG. 1 indicate the same parts having the same shape, and the description thereof will be omitted.

Reference numeral 3 denotes a ring made of a magnetic material such as iron that is slidably fitted into the piston 6 located between the controlled body 7 attached to the tip of the piston 6 and the plate 2; 9 denotes the controlled body 7;
It is an elastic body such as a sponge fixed to the ring 8 side of the ring 8.

Therefore, when current is applied to the coil 4, the magnetic flux generated by the coil 4 forms a magnetic path of the coil 4 → plate 2 → piston 6 → suction rod 5 → yoke 1 → coil 4, or vice versa. The piston 6 is attracted to the suction rod 5 side.

On the other hand, since the magnetic flux from the coil 4 also forms a magnetic path from the plate 2 to the ring 8 to the piston 6 to the suction rod 5 to the yoke 1 to the coil 4, the ring 8 is also attracted to the plate 2 side.

Here, if the amount of protrusion of the piston 6 is large and the gap between the ring 8 and the plate 2 is wide, the magnetic flux to the ring 8 is necessarily small, and the ring 8 cannot be sufficiently attracted.

Therefore, in this embodiment, an elastic body 9 is interposed between the ring 8 and the controlled body 7, so that the ring 8 is always connected to the plate 2.
The ring 8 is moved to the side so that sufficient magnetic flux flows through the ring 8.

Further, since the elastic body 9 is a shrinkable material such as a sponge, the elastic body 9 does not contract after suction and there is no problem such as not being able to sufficiently attract the piston 6.

In this way, the piston 6 is quickly and reliably attracted by the magnetic flux through the plate 2 and the magnetic flux through the ring 8, and its rear end is attracted to the suction rod 5 and stopped.

Even after being attracted, the piston 6 is attracted by the magnetic fluxes of the two paths, so that the overall attraction force of the piston 6 is improved.

As mentioned above, this device is slidably inserted into the piston, which is attracted by energizing the coil, so that when the piston is attracted, the rear end of the piston is attracted to the suction rod and to the plate. It is attracted through a very small gap with the ring, so it does not require much precision of the parts and can be manufactured at a low cost, and since the suction and suction power is increased, it has the effect of being able to be made smaller.

[Brief explanation of the drawing]

Figures 1a and b are sectional views showing a conventional plunger;
The figure is a sectional view of a plunger showing an example of the plunger according to this invention. 1...Yoke, 2...Plate, 4.
...Coil, 6...Zeston, 7...
...Controlled object, 8...Ring.

Claims (1)

[Scope of utility model registration request] A plunger characterized in that a magnetic ring is slidably inserted into a portion of the piston located between a controlled body attached to the tip of the piston and a plate.