JPS6229852B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the assembly of proximity switches.

Conventionally, this type of proximity switch has a bobbin 3 around which a coil 4 is wound, as shown in a side view in FIG.
is housed in the core 2, and the conductor 41 of the coil 4
is temporarily assembled by connecting it to the electric circuit board 5 on which various electric circuit parts 6, 6 are arranged,
This temporarily assembled body is housed in a case 1. Therefore, since the bobbin 3 and the electric circuit board 5 are connected only by the conductive wire 41 that substantially forms the coil 4, it is difficult to transport the temporarily assembled body or place the temporarily assembled body in the case 1. When assembling the case 1, the conductor 41 may be bent or stretched, which may lead to breakage of the conductor 41 or damage to various parts. Be especially careful when handling the case 1 with a narrow inner diameter. was needed.

This invention attempts to solve the above-mentioned problems.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is an exploded perspective view showing a proximity switch according to an embodiment of the present invention, FIG. 3 is a perspective view showing the temporarily assembled state of each component, FIG. 4 is a side sectional view showing the proximity switch, and FIG. 5 6 is a sectional view taken along line 6-6 in FIG. 5, and FIG. 7 is a sectional view taken along line 7-7 in FIG. 5.

In these figures, a case 1 is formed, for example, in a cylindrical shape with a bottom, a core 2 housed in the case 1 accommodates a bobbin 3, and a coil 4 is wound around the bobbin 3. The electric circuit board 5 housed in the case 1 together with these parts is formed of, for example, a hybrid IC or a normal printed circuit board. Circuit parts 6, 6
will be placed.

A cap-shaped cover 7 having a hole 9 through which the cable 8 passes is fitted into the opening at the other end of the case 1, and a recess 10 concentric with the hole 9 is formed on one both sides of the cover 7. A seal member 11 made of an elastic body is provided in the recess 10 to seal between the cover 7 and the cable 8.

A connector 12 is provided between the core 2 and the electric circuit board 5 to connect them to each other. A pin 13 protruding from one surface of the connector 12
is the hole 22 of the boss portion 21 provided in the center of the core 2.
For example, it is fitted by press-fitting.

Further, a plurality of engagers 17, 17 are provided on the peripheral edge of the connector 12 symmetrically with respect to the pin 13,
The engaging members 17, 17 are composed of an arm portion 18 extending parallel to the pin 13 on one side of the connector 12, and a claw portion 19 extending toward the axis of the pin 13 at the end of the arm portion 18. . A notch portion 23 for guiding the claw portion 19 of the engager 17 is provided on the peripheral wall portion of the core 2.
Similarly, notches 33, 33 for guiding the claw portion 19 are provided on the periphery of the collar portion 32 of the bobbin 3, and a hole 34 into which the boss portion 21 is fitted is provided in the center portion. Therefore, bobbin 3
By rotating the connector 12 in a state where it is accommodated in the core 2, the engaging elements 17, 17 engage with the collar portion 32 of the bobbin 3, thereby connecting the bobbin 3 and the core 2.

Furthermore, a groove 16 is provided on the outside of the arm portion 18 for passing the conducting wire 41 forming the coil 4, and an engagement hole 15 is provided to engage with an engagement protrusion 51 formed at one end of the electric circuit board 5. , the engagement hole 15 and the engagement convex portion 51 constitute the engagement portion 14 .

An engagement protrusion 52 that engages with an engagement hole 71 provided in the cover 7 is provided at the other end of the electric circuit board 5, and the engagement protrusion 52 and the engagement hole 71 constitute an engagement portion 74. be done.

Note that the shapes of the engaging portions 14, 74 are not limited to the shapes shown in the figures, and various shapes can be selected as necessary.

The proximity switch in the above configuration is assembled as follows.

First, the bobbin 3 is housed in the core 2, both notches 23 and 33 are aligned, and the pin 13 of the connector 12 is
When the engaging element 17 is inserted into the hole 22 of the core 2, the claw part 19 of the engaging element 17 is guided by both the notches 23, 33 and positioned between the flanges 32, 32 of the bobbin 3. Therefore, when only the bobbin 3 is rotated within the core 2 by a predetermined angle in this state, the claw portion 19 engages the flange portion 32 of the bobbin 3.
The bobbin 3 and the core 2 are connected to each other.

Next, the engaging protrusion 51 of the electric circuit board 5 is engaged with the engaging hole 15 of the connector 12, and the conductive wire 4 of the coil 4 is
1 and 41 to the electric circuit board 5, the core 2, bobbin 3, and electric circuit board 5 are temporarily assembled together (FIG. 3).

Furthermore, one end of the cable 8 is inserted into the hole 9 of the cover 7, and the cable 8 is inserted into the seal member 11, and the seal member 11 is inserted into the recess 10 of the cover 7.
After that, one end of the cable 8 is connected to the electric circuit board 5.

In this state, the engaging protrusion 52 provided at the other end of the electric circuit board 5 is engaged with the engaging hole 71 of the cover 7.

The thus obtained temporary assembly is inserted into the case 1 from the core 2 side through the opening at the other end of the case 1, and the opening is covered with the cover 7 to complete all assembly ( Figures 4 to 7).

In this invention, as described above, the bobbin 3 is attached to the core 2.
The connector 12 provided between the core 2 and the electric circuit board 5 is provided with a plurality of engagers 17, 17 that engage with the periphery of the flange 32 of the bobbin 3 while the core 2 is accommodated. and flange 32 of bobbin 3
Since a plurality of notches 23 and 33 are provided on the periphery to guide the engagers 17 and 17, and an engaging portion 14 is provided in the connector 12 and the electric circuit board 5 to engage each other, the core 2 and the bobbin 3 The electric circuit board 5 can be temporarily assembled by a simple operation, and the temporary assembly is reliable.

Therefore, when transporting the temporarily assembled body,
Or, when assembling it into case 1, each part may easily be disassembled or damaged, or the conductors 41, 41 may
This has the advantage that the risk of wire breakage is extremely reduced.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing a conventional proximity switch.
FIG. 2 is an exploded perspective view showing a proximity switch according to an embodiment of the present invention, FIG. 3 is a perspective view showing the temporarily assembled state of each component, FIG. 4 is a side sectional view showing the proximity switch, and FIG. 6 is a sectional view taken along line 6-6 in FIG. 5, and FIG. 7 is a sectional view taken along line 7-7 in FIG. 5. In the figure, 1 is a case, 2 is a core, 3 is a bobbin, 4 is a coil, 5 is an electric circuit board, 6 is an electric circuit component, 7 is a cover, 8 is a cable, 9 is a hole, 1
0 is a recess, 11 is a sealing member, 12 is a connector, 1
3 is a pin, 14 is an engaging portion, 15 is an engaging hole, 16 is a groove, 17 is an engaging element, 18 is an arm portion, 19 is a claw portion, 2
1 is a boss part, 22 is a hole, 23 is a notch part, 32 is a flange part, 33 is a notch part, 34 is a hole, 41 is a conducting wire,
Reference numerals 51 and 52 indicate engagement projections, 71 an engagement hole, and 74 an engagement portion.

Claims (1)

[Claims] 1 A core 2 housed in a case 1, a bobbin 3 housed in this core 2, a coil 4 wound around this bobbin 3, and a core 2 housed in the case 1 and electrically connected to the coil 4. an electric circuit board 5 connected to the core 2; and a connector 12 provided between the electric circuit board 5 and the core 2 to connect the core 2 and the electric circuit board 5;
The connector 12 is provided with a plurality of engagers 17, 17 that connect the core 2 and the bobbin 3 by engaging with the periphery of the flange 32 of the bobbin 3 housed in the core 2. A plurality of notches 23, 33 are provided on the periphery of the flange 32 of the bobbin 3 for guiding the engagers 17, 17, and an engaging portion 14 is provided for engaging the electric circuit board 5 and the connector 12 with each other. Proximity switch provided.