JPH0510900Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a small-sized filter device using pleated filter paper, which is particularly suitable for use as a circulation filter in a small-sized magnetic disk device.

[Prior Art] Conventionally, a small-sized filter device using pleated filter paper that can be used as a circulation filter in a small-sized magnetic disk device was developed in 1983-
In addition to what is disclosed in No. 35416, as shown in FIG. At the same time, the front of the frame 31
It has been known that the inner wall surfaces 37, 37' of the rear plates 36, 36' and the front and rear ends of the pleated filter paper 34 are fixed with an adhesive 35.

[Problem to be solved by the invention] However, the small filter device disclosed in the above-mentioned Utility Model Application Publication No. 63-35416 has comb-shaped protrusions facing upward, on which both ends of the filter paper folded into pleats can be closely placed. The structure is complicated because a holder protruding from the holder and a pressing member with inverted comb-tooth protrusions that tightly fit and fix the pleated filter paper placed on the holder are required. In addition, since there are a plurality of parts, there is a problem in that the cost of the mold is expensive, and the entire device is therefore expensive.

In addition, in the conventional small filter device shown in FIG. 8, it takes time and effort to apply adhesive around the four circumferences of the pleated filter paper, which results in longer manufacturing times and higher costs. There was a problem.

The present invention was developed to solve the above problems, and aims to provide a small filter device that has only one frame, does not require adhesive, and is easy to manufacture. It is.

[Means for Solving the Problems] The present invention has a side pressing projection, a side inclined projection, and a side mounting part that constitute a holding part protruding from the inner wall surface of both side plates of a square frame body made of synthetic resin. A first means of tightly holding both ends of the pleated filter paper between the protrusions; or, in addition to the first means, the front and rear edges of the folded piece of the pleated filter paper are Alternatively, in addition to the first means, the front and rear edges of the folded piece of pleated filter paper are held close to the rear pressing wall.
The above problem was solved by adopting one of the third means of closely holding the rear pressing protrusion and the front and rear mounting protrusions.

[Function] According to the present invention having the above configuration, both ends of the pleated filter paper are closely held by the holding portions protruding from the inner wall surfaces of both side plates of the rectangular frame body without using an adhesive, and The front and rear plates of the square frame body are
By protruding the rear pressing wall or the front and rear pressing projections and the front and rear mounting projections, it is also possible to closely hold pleated filter paper that is long in the lateral direction.

[Example] Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing the first embodiment of the present invention, in which front and rear plates 1, 2 and side plates 3
Both side ends of pleated filter paper 6 folded into pleats are tightly attached to each inner wall surface 5 of both side plates 3 of a synthetic resin rectangular frame 4 formed by joining them into a rectangular frame shape. A holding portion 7 is formed to allow holding.

The holding portions 7 provided on each inner wall surface 5 of the side plates 3 are configured as follows.

There are narrow gaps 8 on both sides of each inner wall surface 5, and pleated filter paper 6 is provided inwardly facing each other.
Side pressing protrusions 10 having mountain-shaped pressing bottom surfaces 9 corresponding to the shape of the top portions 6a of the pleated filter paper 6 are provided at regular intervals so that the upper surfaces of both ends of the top portions 6a of the pleated filter paper 6 come into contact with each other. , each inner wall surface 5
In the spaces 8 on both sides of the filter paper 6, sloped upper mounting surfaces 11 are provided to match the shape of the folded pieces 6b of the pleated filter paper 6, so that the lower surfaces of both ends near the ends of the folded pieces 6b of the pleated filter paper 6 can be placed thereon. The side inclined projections 12 are provided protrudingly, and the lower surfaces of both ends of the trough portions 6c of the pleated filter paper 6 can be placed facing each other between the side pressing projections 10, respectively, according to the shape thereof. Valley-shaped mounting surface 1
It is formed by protruding side mounting protrusions 14 having a diameter of 3.

As shown in FIG. 2, troughs 6c of the pleated filter paper 6 are formed on each trough-shaped mounting upper surface 13 of the inner wall surface 5 of the side plates 3 of the rectangular frame body 4 provided with the holding portion 7.
The bottom surface of both ends of the part and the inclined upper surface 11
Place the lower surfaces of both ends near the end of the folded piece 6b of the pleated filter paper 6 on the respective sides, and press the upper surfaces of both ends of the top 6a of the pleated filter paper 6 with the mountain-shaped pressing bottom surface 9 to form pleats. The pleated filter paper 6 is held and fixed to the rectangular frame 4 without the need for an adhesive or the like by closely holding the upper and lower surfaces of both ends of the pleated filter paper 6 with the holding parts 7.

Moreover, what is shown in FIG. 3 is an exploded perspective view showing a second embodiment of the present invention. In addition to the configuration shown in the first embodiment, each of the front and rear plates 1 and 2 Pleated filter paper 6 is applied over the entire length of inner wall surface 15.
A front/rear pressing wall 17 is provided protrudingly provided with an inclined surface 16 on the lower surface for pressing the upper surface of the front/rear end edge of the bent piece 6b.

In the case of this second embodiment, in addition to holding both side ends of the pleated filter paper 6 in the holding portion 7 of the first embodiment, as shown in FIG. Since the upper surfaces of the front and rear edges of the pieces 6b are pressed by the inclined surfaces 16 of the front and rear pressing walls 17, the pleated filter paper 6 can be pressed without using adhesive.
is held and fixed to the rectangular frame 4, and the shape of the pleated filter paper 6 is maintained without losing its shape.

The second embodiment is more advantageous than the first embodiment when the pleated filter paper 6 is longer in both directions.

Furthermore, what is shown in FIG. 5 is the third embodiment of the present invention.
It is an exploded perspective view showing an embodiment, and in addition to the configuration shown in the first embodiment, front and rear plates 1,
2, a plurality of front and rear pressing protrusions 19 are provided at regular intervals on each inner wall surface 15 of the pleated filter paper 6, each having an inclined surface 18 that presses the upper surface of the front and rear edge of the folded piece 6b of the pleated filter paper 6. The front/rear pressing protrusions 19 and the side inclined protrusions 12 are located between the front/rear pressing protrusions 19 and on both sides.
In between, each folded piece 6b of the pleated filter paper 6 is provided.
Front and rear mounting protrusions 20 with flat upper surfaces are formed in a protruding manner on which the front and rear edges of the holder are placed.

In the case of this third embodiment, as shown in FIG. The upper surfaces of the front and rear edges of the piece 6b come into contact with the inclined surfaces 18 of the front and rear pressing projections 19 and are pressed downward, and the front and rear edges of the bent piece 6b touch the front and rear mounting projections. Since it is placed on 20,
The pleated filter paper 6 is held and fixed to the rectangular frame 4 without using an adhesive, and the shape of the pleated filter paper 6 is maintained without losing its shape.

In the small filter device of the present invention, since the pleated filter paper 6 has a certain thickness and has a restoring force, the pleated filter paper 6 is placed between the holding parts 7 on both sides, or between the holding parts 7 and the front and rear pressing parts. wall 1
7 or between the front and rear pressing protrusions 19 and the front and rear mounting protrusions 20, they are held in close contact with each other without the need for adhesive, and are also held by the restoring force of the pleated filter paper 6, so there is no need for the conventional sandwiching structure. Not necessary.

In each of the embodiments described above, in order to make it easier to insert the pleated filter paper 6 from the upper opening of the rectangular frame 4, it is preferable to do so as shown in FIG. Although FIG. 7 shows the third embodiment, the same applies to the first and second embodiments), the side pressing projections 10 located above the pleated filter paper 6, the front
It is recommended that the rear pressing wall 17 and the front and rear pressing protrusions 19 form tapered surfaces 21 that become thicker as they go downward from the upper surface side. This results in
Since the width of the upper opening of the rectangular frame 4 increases and the width decreases toward the bottom, it becomes easier to fit the pleated filter paper 6 into the rectangular frame 4.

[Effects of the invention] Since the invention is as described above, the pleated filter paper is moved downward from the upper opening of the rectangular frame body to the side pressing protrusion, and further to the front and rear pressing walls or the front and rear pressing walls. In claim 1, when the pleated filter paper is fitted and inserted while slidingly contacting the pressing protrusion, the both ends of the pleated filter paper are closely held between the side pressing protrusion, the side inclined protrusion, and the side mounting protrusion without using an adhesive. In claim 3, in addition to tightly holding both ends of the pleated filter paper according to claim 1, the front and rear edges of the folded pieces of the pleated filter paper are bonded to the front and rear pressing walls with adhesive. According to claim 5, in addition to the close holding of both ends of the pleated filter paper according to claim 1, the front and rear edges of the folded pieces of the pleated filter paper are The rear pressing protrusion and the front and rear mounting protrusions are closely held together without the need for adhesive, and the purpose can be fully achieved, especially as a circulation filter in a small magnetic disk device.

In addition, according to the present invention, since the pleated filter paper can be fixed with a single member consisting of only a rectangular frame, there are many advantages such as low mold cost and easy manufacturing. .

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the first embodiment of the present invention, Fig. 2 is a vertical cross-sectional view taken along the line A-A in Fig.
The figure is an exploded perspective view showing the second embodiment, FIG. 4 is a vertical sectional view taken along the line B-B in FIG. FIG. 6 is an exploded perspective view showing the embodiment, and FIG. 5C is a diagram showing the pleated filter paper fixed to the isogonal frame.
7 is a perspective view showing another embodiment of the same side pressing protrusion, front/rear pressing wall, or front/rear pressing protrusion, and FIG. 8 is a perspective view showing a conventional example. . In the figure, 1 is the front plate, 2 is the rear plate, 3 is the side plate, 4
is a rectangular frame body, 5 is an inner wall surface, 6 is a pleated filter paper,
6a is the top, 6b is the bent piece, 6c is the valley, 7 is the holding part, 10 is the side pressing projection, 12 is the side inclined projection, 14 is the side mounting projection, 15 is the inner wall surface, and 16 is the inclined part. 17 is the front/rear pressing wall, 18 is the inclined surface,
19 is a front/rear pressing projection, 20 is a front/rear mounting projection, and 21 is a tapered surface.

Claims (1)

[Scope of claims for utility model registration] 1. On the inner wall surfaces of both side panels of a square frame made of synthetic resin,
Side pressing protrusions that press the top portions on both sides of the pleated filter paper and side placing protrusions that place the valley portions on both sides of the pleated filter paper are used to bend the pleated filter paper on both sides. The holding portions are provided with side inclined protrusions on which both ends of the pieces are placed, and are formed so as to protrude alternately from each other, and the both ends of the pleated filter paper are pressed against the sides. A small filter device that is closely held between a protrusion, a side inclined protrusion, and a side mounting protrusion. 2. The small filter device according to claim 1, wherein a tapered surface is formed on the side pressing projection. 3. On the inner wall of both sides of the synthetic resin rectangular frame,
Side pressing protrusions that press the top portions on both sides of the pleated filter paper and side placing protrusions that place the valley portions on both sides of the pleated filter paper are used to bend the pleated filter paper on both sides. It has side inclined protrusions on which both ends of the pieces are placed, and is provided with holding parts formed by opposing and protruding alternately, and further extending over the entire length of the inner wall surfaces of the front and rear plates. Protruding front and rear pressing walls are provided with sloped surfaces on the lower surface for pressing the front and rear edges of the folded pieces of pleated filter paper,
Both side ends of the pleated filter paper are closely held between the side pressing protrusion, the side inclined protrusion and the side placing protrusion, and the front and rear edges of the folded pieces of the pleated filter paper are - A small filter device that is closely held on the rear pressing wall. 4. The small filter device according to claim 3, wherein tapered surfaces are formed on the side pressing projections and the front and rear pressing walls. 5. On the inner wall of both sides of the synthetic resin rectangular frame,
Side pressing protrusions that press the top portions at both ends of the pleated filter paper, and side placing protrusions that place the valley portions at both ends of the pleated filter paper, are used to bend the pleated filter paper on both sides. The pleated filter paper is provided on the inner wall surfaces of the front and rear plates, and has side inclined protrusions on which both ends of the pieces are placed, and holding portions are formed so as to protrude alternately from each other in opposition to each other. A plurality of front and rear pressing protrusions each having an inclined surface for pressing the front and rear edges of the bent piece are protruded from each other, and each of the front and rear pressing protrusions is located between the front and rear pressing protrusions and on both sides. Front and rear mounting protrusions with flat upper surfaces are respectively provided between the front and rear pressing protrusions and the side inclined protrusions, and both ends of the pleated filter paper are connected between the side pressing protrusions and the side inclined protrusions. A small size device in which the front and rear edges of the folded pieces of the pleated filter paper are closely held between the front and rear pressing projections and the front and rear mounting projections, and the folded pieces of the pleated filter paper are closely held between the projections and the side placement projections. filter device. 6. The small filter device according to claim 5, wherein tapered surfaces are formed on the side pressing projections and the front and rear pressing projections.