JPS608406Y2 - solenoid - Google Patents

Description

[Detailed description of the invention] This invention relates to a solenoid used for key operations on a keyboard.

Conventionally, as shown in FIG. 1, this type of solenoid has a fixed iron core 3 and a movable iron core 4 which are provided in the hollow part of a cylindrical bobbin 2 around which an excitation coil 1 is wound, so as to be able to come and go as desired, and at the tip of the movable iron core 4. An operating frame 5 is protruded to the outside through the fixed iron core 3, and a bushing stud 6 is provided on the operating frame 5.
The movable core 4 is biased in the direction of separation from the fixed core 3 by the constant return spring 7, and the movable core 4 is moved in the attracting direction of the fixed core 3 by the excitation of the excitation coil 1, and is moved by the bushing stud 6 via the operating frame 5. There are devices that perform key operations on a keyboard.

In such a solenoid, the movable iron core 4 is moved by the return spring 7.
With the bushing stud 6 separated from the fixed iron core 3, the bushing stud 6 acts as a stopper as shown in the figure.

Therefore, the bushing stud 6 must be firmly attached to the tip of the operating frame 5 in order to provide the bushing stud 6 with a stable stopper action even when the movable iron core 4 is frequently reciprocated.

Therefore, in the past, a threaded portion was formed at the tip of the operating frame 5, the bushing stud 6 was screwed into this, a threaded portion was also formed at the end of the operating frame 5, and this threaded portion was formed on the movable iron core 4 side. It is screwed into the section.

However, this requires a troublesome machining and assembly process to assemble the operating frame 5 and the bushing stud 6 to the tip of the movable core 4, which makes the assembly of the entire solenoid time-consuming and expensive. This had a drawback in terms of quality, as the threaded portion could become loose during use, causing the operation frame 5 and stud 6 to come out and fall off.

In particular, when such solenoids are produced in large quantities, the low productivity of each individual solenoid becomes an extremely disadvantageous economical factor.

This invention was made in order to eliminate the above-mentioned drawbacks, and the purpose is to provide a solenoid that is easy to assemble and can be made at a significantly lower cost, while also improving quality.

One implementation of this invention will be described below with reference to the drawings.

In FIG. 2, 11 is a cylindrical bobbin, and an exciting coil 12 is wound around this bobbin 11.

A fixed iron core 13 is arranged at one end of the bobbin 11.

In this case, the fixed core 13 has a hollow portion that communicates with the hollow portion of the bobbin 11.

A frame 14 made of magnetic material is provided to surround the excitation coil 12.

This frame 14 has a U-shaped cross section, and has a through hole 141 communicating with the opening of the bobbin 11 on the bottom surface, and the fixed iron core 13 at the open end opposite to the through hole 141.
is installed.

A pipe 15 made of a non-magnetic material is inserted into the hollow portions of the bobbin 11 and fixed iron core 13.

This pipe 15 has one end protruding from the other end of the bobbin 11, that is, the through hole 141 of the frame 14, by a predetermined distance, and a stopper 151 for a movable iron core 16, which will be described later, is formed at the tip of this protruding side.

As shown in FIG. 3, this stopper 151 has two notches 151a formed along the circumferential direction of the tip of the pipe 15, and a portion from the notches 151a to the tip of the pipe 15.
It is made by bending it towards the center.

In this case, the stopper 151 has notches 151a formed at two locations, but the notches 151a may be formed at one or more locations.

A movable iron core 16 is inserted through the other opening of the pipe 15.

A cushioning material 17 such as rubber is attached to one end of the movable core 16 corresponding to the stopper 151.

Further, an operating body, that is, a bushing stud 19 is provided at the other end of the movable iron core 16 via an operating frame 18.

In this case, the operating frame 18 has a bushing stud 19 attached to its tip by, for example, press-fitting, and its end is attached to the movable core 16 by press-fitting as described above.

A spring receiver 20 is attached to the open end of the frame 14, and a return spring 21 is inserted between the spring receiver 20 and the movable iron core 16.

In this case, the spring receiver 20 is a through hole 2 through which the operation frame 18 passes.
01.

Note that 22 in FIG. 2 is a dustproof cap that closes the opening on the protruding side of the pipe 15.

Thus, in the thus constructed Tsuremade, the movable iron core 16 is always separated from the fixed iron core 13 by the biasing force of the spring 21 and comes into contact with the stopper 151.

When the exciting coil 12 is excited in this state, it is attracted by the fixed iron core 13 and moves to the right in the figure against the force of the spring 21.

As a result, the stud 19 also moves to the right in the figure via the operation frame 18, and a key operation is performed.

Therefore, with this configuration, the stopper formed on the pipe can always maintain the state in which the movable core is separated from the fixed core. The threaded portions used to attach the hinge stud to the operation frame and the operation frame to the movable iron core are completely unnecessary, and the installation can be as simple as press-fitting.

This simplifies the process of machining and assembling this part compared to the conventional method of machining the threaded part and assembling via this threaded part, and it is easy and inexpensive to assemble from the perspective of the solenoid as a whole. It is also possible to reduce the cost.

In addition, during use, no force is applied to the part where the stud is attached to the operation frame and the part where the operation frame is attached to the movable iron core, so it is possible to reliably prevent the attachment of these parts from loosening, improving quality and reliability. It is also advantageous from this point of view.

Furthermore, according to the above structure, since the pipe protrudes to the outside, a good heat dissipation effect can be obtained, and the size can be reduced accordingly.

In this case, the heat dissipation effect can be further enhanced by attaching fins to the pipe.

Furthermore, since a cap is provided at the open end of the pipe, it is possible to obtain a dustproof effect, improve durability, and also obtain a noise reduction effect.In addition, by color-coding the cap, the capacity of the excitation coil and the suction can be adjusted. It is also possible to display the magnitude of force.

Note that this invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications without changing the gist.

As described above, according to this invention, it is possible to provide a solenoid that is easy to assemble, can be inexpensive, and can also improve quality.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing an example of a conventional Tsuremade, Figure 2
The figure is a longitudinal cross-sectional view showing one embodiment of this invention, and FIG. 3 is a perspective view showing a stopper formed on a pipe used in the same embodiment. 1.12...Excitation coil, 2,11...
・Bobbin, 3, 13...Fixed iron core, 4, 16・
・・・・・・Movable iron core, 5, 18 ・・・・Operation stick, 6
,19...butsustad,7,21...
...Spring, 14...Frame, 141...
...Through hole, 15...Pipe, 151...
... Stopper, 151a... Cut, 17...
...Buffer material, 20...Spring holder, 201...
...Through hole, 22...Cap.

Claims (4)

[Scope of utility model registration request] (1) A cylindrical bobbin wound with an excitation coil, a fixed iron core disposed at one end of the bobbin, and a fixed core inserted into a hollow part of the bobbin and protruding from the other end of the bobbin by a predetermined distance. A pipe with a stopper formed at the tip thereof, a movable iron core movably provided in the hollow part of this pipe, and a return mechanism in which the movable iron core is biased in the opening direction from the fixed iron core and brought into contact with the stopper. A solenoid comprising a spring, an operating frame and an operating body attached to the movable iron core. (2) The stopper of the pipe is formed by forming a notch along the circumferential direction of the tip of the pipe and bending the portion from the notch to the tip toward the center of the pipe. Solenoid described in section. (3) The solenoid according to claim 1 or 2, wherein the pipe is provided with a fin on a protruding portion. (4) Utility model registration claims 1 to 3, characterized in that the pipe is provided with a cap at the opening end of the protrusion.
The solenoid described in any of the paragraphs.