JPH0513371Y2 - - Google Patents

Description

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

[Prior Art] Conventionally, a small filter device using sheet-like filter paper that can be used as a circulation filter in a small magnetic disk device has two side plates 22 of a frame 21 as shown in FIG. , 22' and the inner wall surfaces 25, 25' of the front and rear plates 24, 24'. The outer edge of the filter paper 27 is placed, and an adhesive 28 is applied to the edge of the sheet filter paper 27 to attach the sheet filter paper 27.
A structure in which the frame body 21 is fixed to the frame body 21 is known.

[Problems to be solved by the invention] However, in the conventional small filter device, it takes time and effort to apply adhesive around the four circumferences of the sheet-like filter paper, and as a result, it takes time to manufacture it, resulting in high costs. There was a problem with that.

The present invention has been devised to solve the above-mentioned problems, and aims to provide a compact filter device that does not require adhesive and is easy to manufacture.

[Means for Solving the Problems] The present invention includes pressing protrusions that press each outer end of a sheet-like filter paper on the inner wall surfaces of the front and rear plates and the left and right side plates of a square frame made of synthetic resin; a holding portion formed by alternately protruding and facing each other mounting protrusions on which each outer end of the sheet-like filter paper is mounted;
In addition, the above-mentioned problem has been solved by employing means for closely holding each outer end of the sheet-like filter paper between each of the pressing protrusions and each of the mounting protrusions.

[Function] According to the present invention having the above configuration, each outer end of the sheet filter paper is closely held horizontally between each pressing protrusion and each mounting protrusion of the rectangular frame without using an adhesive. Ru.

[Example] An example of the implementation of the present invention will be described in detail with reference to the drawings.
Each inner wall surface 1a, 2a, 3a,
4a is formed with a holding portion 7 that can tightly hold each outer end of the rectangular sheet-like filter paper 6.

The front and rear plates 1 and 2 and the left and right side plates 3,
The holding portions 7 provided on each of the inner wall surfaces 1a, 2a, 3a, and 4a of 4 are configured as follows.

A pressing protrusion 9 is provided with a pressing bottom surface 8 that presses the upper surface of the outer end of the front and rear plates 1 and 2 of the sheet filter paper 6, facing the inner wall surfaces 1a and 2a of the front and rear plates 1 and 2, respectively, One or more pieces are protruded at regular intervals, while each inner wall surface 1a, 2 of the front and rear plates 1, 2
A mounting protrusion 11 equipped with a mounting upper surface 10 on which the lower surface of the outer end of the front and rear plates 1 and 2 of the sheet-like filter paper 6 is placed, facing each other on the side of the pressing protrusion 9 of a,
One or more pieces are formed by protruding at regular intervals, and each inner wall surface 3a, 4 of the left and right side plates 3, 4 is formed.
A pressing bottom surface 12 that presses the upper surface of the outer end of the left and right side plates 3 and 4 of the sheet-like filter paper 6, facing respectively a.
One or more pressing protrusions 13 with
A loading surface 14 is provided on the side of the pressing bottom surface 12 of each inner wall surface 3a, 4a, on which the lower surface of the outer end of the left and right side plates 3, 4 of the sheet-like filter paper 6 is placed, facing each other. It is formed with a protruding projection 15.

Then, the lower surfaces of the outer ends of the sheet filter paper 6 are placed on the placement upper surfaces 10 and 14 of the respective placement protrusions 11 and 15 of the rectangular frame body 5 equipped with the holding portion 7, and the sheet filter paper 6 is The top surface of each outer end of the sheet filter paper 6 is pressed by the pressing bottom surfaces 8, 12 of the respective pressing protrusions 9, 13 to closely hold each outer edge of the sheet filter paper 6 in a horizontal state, so that the sheet filter paper 6 is shaped like a rectangle. It is held and fixed to the frame 5 without using adhesive or the like.

In the small filter device of the present invention, since the sheet-like filter paper 6 has a certain thickness and has a restoring force, the sheet-like filter paper 6 has the respective pressing protrusions 9 and 13 and the respective mounting protrusions constituting the holding part 7. 11,15
They are held in close contact with each other without the need for adhesive.

In order to make it easier to insert the sheet-like filter paper 6 into the upper opening of the rectangular frame 5, although there is no need to specifically limit it, it is preferable to use a method as shown in FIG.
It is recommended to form a tapered surface 16 that becomes thicker as it goes downward from the upper surface side of each of the pressing protrusions 9, 13 located above the sheet-like filter paper 6.
As a result, the width of the upper opening of the rectangular frame 5 increases, and the width decreases toward the bottom, making it easier to fit the sheet filter paper 6 into the rectangular frame 5.

[Effect of the invention] Since the present invention is as described above, when the sheet-like filter paper is inserted downward from the upper opening of the rectangular frame while its periphery is in sliding contact with each pressing protrusion, the sheet-like filter paper is Each outer end can be held closely in a horizontal position without the need for adhesive between each pressing projection and each mounting projection, and can sufficiently achieve its purpose, especially as a circulation filter in a small magnetic disk device. In addition, small filters can be manufactured quickly and easily, and the advantages thereof are enormous.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Fig. 2 is a vertical sectional view taken along the line A-A in Fig. 1 showing a sheet filter paper fixed to a rectangular frame, and Fig. 3 is the same. FIG. 4 is a perspective view showing another embodiment of the pressing protrusion, and FIG. 5 is a partially cutaway perspective view showing a conventional example. In the figure, 1 is a front plate, 2 is a rear plate, 3 is a left side plate, 4 is a right side plate, 1a, 2a, 3a, 4a are inner wall surfaces, 5 is a rectangular frame, 6 is a sheet of filter paper, and 7 is a holding part , 8 and 12 are pressing bottom surfaces, 9 and 13 are pressing projections, 10 and 14 are placement top surfaces, 11 and 15 are placement projections, and 16 is a tapered surface.

Claims (1)

[Claims for Utility Model Registration] 1. Pressing protrusions that press each outer end of a sheet-like filter paper on the inner wall surfaces of the front and rear plates and the left and right side plates of a square frame made of synthetic resin, and the sheet-shaped filter paper. holding portions formed by alternately protruding and facing each other with placing protrusions on which the respective outer ends of the filter paper are placed; A small filter device that is closely held between mounting protrusions. 2. The small filter device according to claim 1, wherein each pressing projection has a tapered surface.