Ventilation device

Abstract

To provide a magnet used ventilation device.SOLUTION: A ventilation device includes a main body 1 having a ventilation passage 5, a lid 50 rotatably supported on the main body 1 for opening and closing an indoor-side opening 22 of the ventilation passage 5, main magnetic force holding means 60, and secondary magnetic force holding means 70. The main magnetic force holding means includes a magnet 61 (first magnetic field generating element) disposed on the main body 1 near a rotation axis L of the lid 50, and an iron core 62 (second magnetic field generating element) disposed on the lid 50. The iron core 62 is magnetically attached to the magnet 61 and can rotate around the rotation axis L and be detachable toward the indoor side. This allows the lid 50 to be opened, closed, and detached from the main body 1. The secondary magnetic force holding means 70 includes an iron core 71 (third magnetic field generating element) disposed within the main body 1 and a magnet 72 (fourth magnetic field generating element) disposed on an outdoor surface of the lid. When the lid 50 is in the closed position, the magnet 72 is magnetically attached to the iron core 71.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a ventilation device that uses a magnet to hold a lid in an openable, closable, and detachable manner. [Background technology]

[0002] As disclosed in Patent Document 1, for example, a ventilation device installed on a sash door has an operating plate disposed inside the device body having a ventilation passage, and this operating plate is slid using an operating part provided on the device body to open and close the ventilation passage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-71933 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] The ventilation device of Patent Document 1 has many exposed vents on the indoor side of the device, which makes for a poor appearance. In addition, the ventilation device must be disassembled for maintenance such as cleaning the interior, which is time-consuming. [Means for solving the problem]

[0005] The present invention has been made to solve the above-mentioned problems, and is characterized in that it comprises a ventilation device comprising a device main body having a ventilation passage, a lid that is rotatably supported on the device main body around a rotation axis passing through one side edge or its vicinity and that opens and closes the indoor opening of the ventilation passage, and a magnetic holding means that holds the lid rotatably and detachably relative to the device main body around the rotation axis by magnetic force acting between the device main body and the lid. With this configuration, when the lid is closed, the ventilation structure on the indoor side is hidden by the lid, improving the appearance. In addition, the lid can be easily removed against the magnetic force of the magnetic holding means, and maintenance of the inside of the ventilation device can be easily performed with the indoor opening exposed.

[0006] The magnetic force holding means includes at least a main magnetic force holding means, which has a first magnetic field forming body arranged on the device main body and a second magnetic field forming body arranged on the lid near the rotation axis, at least one of the first and second magnetic field forming bodies being formed by a magnet, and the second magnetic field forming body is rotatable around the rotation axis relative to the first magnetic field forming body while magnetically attached to the first magnetic field forming body and is detachable toward the inside of the room. According to this configuration, the main magnetic force holding means can hold the lid rotatably and detachably relative to the device body.

[0007] The first magnetic field forming body is made of a magnet and has a receiving surface facing the interior of the room, and the second magnetic field forming body is made of an iron core extending along the rotation axis, and a portion of the outer periphery of the iron core is magnetically attracted to the receiving surface of the magnet. According to this configuration, the magnet on the device body side and the iron core on the lid side allow the lid to rotate smoothly.

[0008] Furthermore, an open position maintaining means is provided for maintaining the lid in an open position at a predetermined angle, and the open position maintaining means includes an inclined surface formed on the side edge portion of the lid on the rotation axis side, and when the lid is in the open position at the predetermined angle, the magnetic force of the main magnetic force holding means causes the inclined surface to press against the indoor side surface of the device main body or a gasket affixed to the indoor side surface. This configuration allows the lid to be maintained in an open position with a simple structure without impairing the lid's ability to be removed.

[0009] Furthermore, an open position maintaining means is provided for maintaining the lid in an open position at a predetermined angle, and the open position maintaining means has a support convex portion formed on one side of the lid on the rotation axis side and protruding toward the device main body, and a holding recess formed on the surface of the device main body facing the interior of the chamber and receiving the support convex portion, and the outer periphery of the support convex portion and the inner periphery of the holding recess have a cam shape that regulates the rotation of the support convex portion by the magnetic force of the main magnetic force holding means when the lid is in the open position at the predetermined angle. This configuration allows the lid to be maintained in an open position with a simple structure without impairing the lid's ability to be removed.

[0010] The magnetic force holding means further includes a secondary magnetic force holding means, which has a third magnetic field forming body arranged within the device body and a fourth magnetic field forming body arranged on the outdoor surface of the lid, at least one of the third and fourth magnetic field forming bodies being formed by a magnet, and the third and fourth magnetic field forming bodies being magnetically attracted when the lid is in the closed position. With this configuration, the secondary magnetic force holding means can reliably maintain the lid in a closed state.

[0011] A filter is detachably housed inside the device body, and a filter presser that presses the filter from the indoor side is detachably housed inside the device body, and the third magnetic field forming body is provided on the filter presser. According to this configuration, the third magnetic field generating body is provided on the filter holder rather than on the device body, so that the structure of the device body can be simplified.

[0012] A packing is arranged on the indoor side surface of the device body so as to surround the indoor opening, and when the lid is in the closed position, the magnetic force of the secondary magnetic force holding means presses the lid against the packing. According to this configuration, the lid is pressed against the packing by the magnetic force of the secondary magnetic force holding means, thereby improving airtightness and liquid tightness.

[0013] The device body and the lid are formed long and narrow, with the main magnetic force holding means arranged at each of the longitudinal ends of the lid, and a finger-hook recess is formed on the interior side of the device body adjacent to at least one of the longitudinal end edges of the lid. With this configuration, even when the lid is closed, the lid can be easily opened, closed, or removed by inserting a fingertip into the finger-hook recess and hooking it onto the edge of the lid.

[0014] The device main body has an outdoor body and an indoor body, and the outdoor body is inserted into a hole formed in the outdoor wall of the sash door frame, the indoor body is inserted into a hole formed in the indoor wall of the frame, and the outdoor body and the indoor body are connected so as to sandwich the frame, thereby attaching the device main body to the frame. With this configuration, the ventilation device can be attached to any sash door, regardless of its structure or material.

[0015] The ventilation device according to claim 1, characterized in that the device body is formed vertically and is attached to the vertical frame of a sliding sash door, and its upper or lower end is extended in the longitudinal direction, and a pull portion is formed on this extension. According to this configuration, the pull tab is integrated with the device body, so there is no need to manufacture the pull tab separately, which reduces costs. [Effects of the Invention]

[0016] According to the present invention, maintenance of the inside of the device body can be easily performed by removing the lid, and the external appearance is also excellent. [Brief explanation of the drawings]

[0017] [Figure 1] 1A and 1B show a vertical frame of a sash door equipped with a ventilation device according to a first embodiment of the present invention, in which (A) is a front view seen from inside the room, and (B) is a rear view seen from outside the room. [Figure 2] This is a front view of the vertical frame as seen from inside the room, (A) shows the lid open, and (B) shows the lid removed. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] 1 shows a front view of the indoor body and filter holder of the ventilation device, and a rear view of the lid. [Figure 6] FIG. [Figure 7] 3 is a longitudinal cross-sectional view of the ventilation device taken along a plane passing through a main magnetic force holding means. FIG. [Figure 8] FIG. 8 is an enlarged cross-sectional view showing the main magnetic force holding means of FIG. 7. [Figure 9] 9 is a cross-sectional view taken along the line IX-IX in FIG. 8. [Figure 10] FIG. 2 is a longitudinal cross-sectional view of the ventilation device taken along a plane passing through a secondary magnetic force holding means. [Figure 11] 11 is an enlarged cross-sectional view showing the secondary magnetic force holding means of FIG. 10. FIG. [Figure 12] FIG. 12 is a cross-sectional view taken along the line XII-XII in FIG. [Figure 13] FIG. 2 is an enlarged front view of the main magnetic force retaining means and its vicinity in the indoor body. [Figure 14] FIG. 2 is an enlarged perspective view showing the vicinity of the main magnetic force retaining means in the indoor side main body and the lid. [Figure 15] (A) is an enlarged cross-sectional view showing the support protrusion on the lid and the holding recess on the indoor body when the lid is closed, and (B) is an enlarged cross-sectional view showing the gasket on the lid and the indoor body when the lid is closed. [Figure 16] (A) is an enlarged cross-sectional view showing the support protrusion of the lid and the holding recess of the indoor body when the lid is in the open position, and (B) is an enlarged cross-sectional view showing the gasket of the lid and the indoor body when the lid is in the open position. [Figure 17] FIG. 10 is a front view of a sliding sash door equipped with a ventilation device according to a second embodiment of the present invention. [Figure 18] FIG. 2 is a perspective view of the indoor side main body of the ventilation device. DETAILED DESCRIPTION OF THE INVENTION

[0018] <Device configuration> A ventilation device according to a first embodiment of the present invention will be described below with reference to the drawings. As shown in Figs. 1 and 2, the ventilation device is installed, for example, on the vertical frame S of a sash door. The ventilation device includes a vertically long device body 1 made of resin (non-magnetic). As shown in Figs. 3 and 4, the device body 1 includes a hollow outdoor body 10 and a hollow indoor body 20. The outdoor body 10 is inserted into a vertically long hole formed in the back wall (the wall on the outdoor side) of the vertical frame S. Similarly, the indoor body 20 is inserted into a vertically long hole formed in the front wall (the wall on the indoor side) of the vertical frame S. The outdoor body 10 and the indoor body 20 are connected by screws 4 (shown only in Figure 10) that are screwed into the indoor body 20. The outdoor body 10 and the indoor body 20 have flanges 11, 21 around their peripheries, and these flanges 11, 21 abut against the back wall and front wall of the vertical frame S, respectively, so that the device body 1 is attached with the vertical frame S sandwiched between them.

[0019] As shown in Figure 1(B), the outdoor body 10 has an outdoor opening 12 with a lattice formed therein. As shown in Figures 4 and 5, the indoor body 20 has an indoor opening 22. The outdoor opening 12 and the indoor opening 22 are connected via the internal space of the device body 1, thereby forming a ventilation passage 5. A packing 80 is attached to the indoor side surface of the indoor side body 20 so as to surround the indoor side opening 22.

[0020] <Other components> The ventilation device further includes a filter 30, a filter holder 40, and a lid 50, each of which has a vertically elongated shape as shown in FIG. The filter 30 is held inside the indoor-side main body 20. To put it simply, as shown in Figure 7, insertion grooves 23 are formed on the inner surface of both longitudinal ends of the indoor-side main body 20, and filter receiving portions 24 are formed at intervals in the longitudinal direction. The filter 30 is inserted through the indoor-side opening 22 and abuts against the filter receiving portion 24, with both ends inserted into the insertion grooves 23, and is further held down from the indoor side by a filter holder 40 inserted through the indoor-side opening 22, thereby being held within the indoor-side main body 20.

[0021] As shown in Figures 4 to 6, resin filter holder 40 is flexible and has a ladder-shaped main body 41, a plurality of protrusions 42 formed at intervals in the longitudinal direction on one side of main body 41, and a plurality of elastic engagement claws 43 formed at intervals in the longitudinal direction on the other side of main body 41. Elastic engagement claw 43 has a knob portion 44 and a protrusion 45. Filter holder 40 is attached to indoor-side main body 20 by inserting one protrusion 42 into a hole 25 (see Figures 3 and 4) formed in one side wall of indoor-side main body 20 and engaging the other protrusion 45 with a longitudinally extending ridge 26 (see Figures 7 and 8) formed on the inner surface of the other side wall of indoor-side main body 20.

[0022] The filter holder 40 has a plurality of support parts 46 that are spaced apart in the longitudinal direction and span both sides of the main body 41. The support parts 46 support an iron core 71 (third magnetic field generating body) that constitutes part of the sub-magnetic force holding means 70 (described later) in a state where it is exposed to the indoor side.

[0023] The lid 50 is made of resin (non-magnetic), and as shown in Figures 1(A) and 2(A), one side edge is supported on one side of the indoor body 20 so as to be able to open and close around the rotation axis L. As shown in Figures 15(B) and 16(B), the surface of the lid 50 facing the indoor body 20 is flat, and the side edge on the rotation axis L side has an inclined surface 55 that is inclined relative to this flat surface.

[0024] 5 and 10, a plurality of cylindrical support protrusions 51 are formed at intervals in the longitudinal direction on the surface facing the indoor side main body 20, and magnets 72 (fourth magnetic field forming bodies) are embedded in these support protrusions 51. The plurality of magnets 72 are arranged at positions corresponding to the plurality of iron cores 71 provided in the filter holder 40, and cooperate with the iron cores 71 to form the sub-magnetic force holding means 70 (see FIGS. 10 to 12).

[0025] As shown in Figures 7 to 9, semi-cylindrical support protrusions 52 are formed on both ends of the lid 50 on the rotation axis L side, and an iron core 62 (second magnetic field generating body) is embedded in these support protrusions 52. The iron core 62 extends along the rotation axis L. The end of the iron core 62 is exposed over a predetermined angular range.

[0026] Magnets 61 (first magnetic field generating bodies) are embedded in the indoor-facing surfaces of both ends of the indoor-side main body 20 at positions corresponding to the exposed portions of the iron core 62 of the lid 50. The magnets 61 have receiving surfaces 61a facing the interior of the room. The magnets 61 and the iron core 62 constitute the main magnetic pole holding means 60 (see Figures 8 and 9).

[0027] 5, 13, and 14, on the indoor-side surface of both ends of the indoor-side main body 20, holding recesses 27 for receiving the support protrusions 52 of the lid 50 are formed adjacent to the magnets 61. The functions of these support protrusions 52 and holding recesses 27 will be described later. In addition, finger hook recesses 28 are formed on the indoor side surfaces of both end portions of the indoor side main body 20 at locations adjacent to both longitudinal end edges of the lid 50.

[0028] The following describes the operation of the ventilation device 1. The lid 50 is held to the device body 1 only by the magnetic force of the magnetic force holding means, that is, the primary magnetic force holding means 60 and the secondary magnetic force holding means . <About the lid closed state> When the lid 50 is in the closed position, as shown in Figures 11 and 12, the magnet 72 of the lid 50 is magnetically attracted to the iron core 71 of the filter holder 40, and the magnetic force of this secondary magnetic force retaining means 70 causes the flat surface of the lid 50 to press against the packing 80 as shown in Figure 15(B), thereby blocking the ventilation passage 5 in an airtight and liquid-tight manner. Note that with the lid 50 in this closed state, as shown in Figures 8 and 9, the iron core 62 of the lid 50 is also magnetically attracted to the magnet 61 of the indoor body 20, and the magnetic force of this primary magnetic force retaining means 60 also contributes to pressing against the packing 80.

[0029] <Lid opening operation> To open the lid 50, insert your finger into the finger-hook recess 28 of the indoor-side main body 20 and hook it around one longitudinal edge of the lid 50, then rotate the lid 50 around the rotation axis L, i.e., the iron core 62 of the main magnetic force holding means 60. This places the lid 50 in the open position, allowing ventilation through the ventilation passage 5.

[0030] While the lid 50 is rotating, the magnet 72 of the secondary magnetic force holding means 70 separates from the iron core 71 and loses its function of magnetically holding the lid 50 and the indoor body 20 together, but in the primary magnetic force holding means 60, the iron core 72 of the lid 50 rotates relative to the magnet 61 of the indoor body 20 while remaining magnetically attached to the receiving surface 61a of the magnet 61, thereby maintaining its function of holding the lid 50.

[0031] When the lid 50 reaches an open position at a predetermined opening angle (60° in this embodiment), the inclined surface 55 of the lid 50 rests on the packing 80, as shown in Figure 16(B). The magnetic force of the main magnetic force retaining means 60 causes this inclined surface 55 to press against the packing 80, thereby maintaining the open position of the lid 50. In this way, the inclined surface 55 of the lid 50 and the packing 80 (or the indoor-side surface of the indoor-side main body 20) form a first open position maintaining means that maintains the open position of the lid.

[0032] As described above, in this embodiment, in order to open the ventilation passage 5, it is not necessary to use an operating plate located inside the ventilation device and an operating unit located on the indoor side to operate the operating plate, as in the conventional structure, so the internal structure of the ventilation device can be simplified and a wide opening area can be ensured for the indoor side opening 22 of the ventilation passage 5.

[0033] <Function of the supporting protrusion and the holding recess> The outer periphery of the support protrusion 52 of the lid 50 and the inner periphery of the holding recess 27 of the indoor side main body 20 are cam-shaped, and together they constitute a second open position maintaining means for stabilizing the open position of the lid 50. This will be described in detail below. The outer periphery of the support protrusion 52 has a flat surface 52a formed by cutting a portion of the cylindrical surface (a cylindrical surface extending over a predetermined angular range centered on the iron core 72) flat, and has raised portions 52b, 52c formed by raising both ends of this flat surface 52a and the boundary portion between the cylindrical surface and the cylindrical surface outward in the radial direction. Meanwhile, the inner periphery of the holding recess 27 has a pair of raised, approximately arc-shaped holding surfaces 27b, 27c, and a gap 27a between these holding surfaces 27b, 27c.

[0034] When the lid 50 is in the closed state, as shown in Figure 15(A), a portion of the cylindrical surface of the support protrusion 52 contacts one of the holding surfaces 27b and also contacts the bottom surface of the gap 27a between the holding surfaces 27b and 27c, and one of the raised portions 52b of the support protrusion 52 is located at the end of the holding surface 27c.

[0035] During the process of opening the lid 50 against the magnetic force of the secondary magnetic force retaining means 70, there is almost no resistance between the support protrusion 52 and the holding recess 27 until the lid 50 approaches the predetermined angle open position. When the lid 50 approaches the predetermined angle open position, the raised portion 52b passes through the gap 27a and abuts against the edge of the receiving surface 27b. When the lid 50 is further rotated in the opening direction, resistance is encountered as the raised portion 52b climbs up over the edge of the receiving surface 27b. This resistance is due to the magnetic force of the primary magnetic force retaining means 60. When the lid 50 is further rotated in the opening direction against this magnetic force and reaches the predetermined angle open position (at this time, the iron core 62 momentarily displaces slightly away from the receiving surface 61a of the magnet 61 and returns to its original position), the flat surface 52a of the support protrusion 52 faces the gap 27a of the holding recess 27, and the raised portions 52b and 52c rest on the edges of the holding surfaces 27b and 27c, respectively, as shown in FIG. 16(A). In this state, if you try to rotate the lid 50 in the closing or opening direction, the lid 50 will encounter resistance between the support protrusion 52 and the holding recess 27 (resistance caused by the magnetic force of the main magnetic force holding means 60), and will therefore be maintained in an open position at a specified angle.

[0036] In this embodiment, the second open position maintaining means has relatively weak resistance to rotation of the lid 50 from the open position at a predetermined angle, and serves to complement the open position function of the first open position maintaining means described above, but may also have a stronger open position function.

[0037] When the lid 50 is in the open position, it is held to the indoor body 20 only by the magnetic force of the main magnetic force holding means 60, so even if a strong force is inadvertently applied (for example, when used with sliding doors and another sash door hits the lid 50), the open position is released and the lid 50 is forcibly closed or detached from the indoor body 20, thereby preventing damage to the lid 50.

[0038] <Removing the lid> The cover 50 in the open position can be easily removed from the device body 1 by pulling it away from the device body 1 against the magnetic force of the main magnetic force holding means 60. When the lid 50 is in the closed state, it can be easily removed from the device main body 1 by inserting a fingertip into the finger hook recess 28 of the indoor body 20, grasping one longitudinal end of the lid 50 with the fingers, and pulling it away from the device main body 1 against the magnetic forces of the main magnetic force holding means 60 and the secondary magnetic force holding means 70.

[0039] After removing the lid 50 from the device main body 1, maintenance of the inside of the device main body 1 can be performed. That is, by grasping and pulling the knob portion 44 of the elastic engagement claw 43 of the filter holder 40, the protrusion 45 of the elastic engagement claw 43 disengages from the ridge 26 of the indoor-side body 20, and by pulling further, the protrusion 42 of the filter holder 40 disengages from the hole 25 of the indoor-side body 20, allowing the filter holder 40 to be removed from the indoor-side opening 22 of the device main body 1, and finally the filter 30 to be removed from the indoor-side opening 22. As a result, the inside of the ventilation device 1 can be easily cleaned, the filter 30 can be replaced, and so on.

[0040] 17 and 18 show a ventilation device according to a second embodiment of the present invention. This ventilation device is provided on each of the vertical frames 101a of two (or more) sliding sash doors 101 incorporated into a sliding window 100. The indoor-side body 20A of the device main body 1A of this ventilation device is formed longer than the indoor-side body 20 of the first embodiment, and is fitted into a hole formed in the front wall of the vertical frame 101a, as in the first embodiment. The lower end of the indoor-side body 20A is extended, and a vertically long finger-hook recess 29a is formed on the indoor-facing surface of this extension, which serves as a pull handle 29.

[0041] The other configurations of the ventilator of the second embodiment are the same as those of the first embodiment, so detailed description thereof will be omitted. The outdoor body (not shown) may or may not be extended to the same length as the indoor body 20A. According to the second embodiment, the pull tab 29 is integrated with the indoor body 20A, eliminating the need to manufacture the pull tab 29 separately, thereby reducing costs.

[0042] The present invention is not limited to the above-described embodiment, and various modifications are possible. The magnetic force holding means may comprise only the main magnetic force holding means. The open position maintaining means may comprise only one of a first open position maintaining means consisting of an inclined surface of the lid and a gasket, and a second open position maintaining means consisting of a support protrusion on the lid and a holding recess on the device body. The support projections on the lid and the holding recesses on the device body may be adapted to maintain the lid in both the open and closed positions. The ventilation device may be installed not only on the vertical frame of the sash door, but also on the horizontal frame such as the top frame or bottom frame. [Industrial Applicability]

[0043] The present invention can be applied to a ventilation device that uses magnetic force. [Explanation of symbols]

[0044] 1. 1A Device body 5 Ventilation passage 10 Outdoor unit 20, 20A indoor unit 22 Indoor opening 27 Retaining recess 28 Finger recess 29 Pull handle 30 filters 40 Filter holder 50 lids 52 Support protrusion 55 Slope 60 Main magnetic field generator 61 Magnet (first magnetic field forming body) 62 Iron core (second magnetic field forming body) 70 Sub-magnetic field forming body 71 Iron core (third magnetic field forming body) 72 Magnet (fourth magnetic field forming body) 80 Gasket

Claims

1. a device body having a ventilation passage; a cover that is rotatably supported on the device body around a rotation axis that passes through one side edge portion or the vicinity thereof and that opens and closes the indoor side opening of the ventilation passage; a magnetic holding means for holding the lid rotatably and detachably about the rotation axis relative to the device body by a magnetic force acting between the device body and the lid; A ventilation device comprising:

2. the magnetic force holding means includes at least a primary magnetic force holding means, the primary magnetic force holding means having a first magnetic field forming body disposed on the device body and a second magnetic field forming body disposed on the lid in the vicinity of the rotation axis, at least one of the first and second magnetic field forming bodies being formed by a magnet; The ventilation device described in claim 1, characterized in that the second magnetic field forming body is magnetically attached to the first magnetic field forming body and is rotatable around the rotation axis relative to the first magnetic field forming body and detachable toward the room.

3. the first magnetic field forming body is made of a magnet and has a receiving surface facing the interior of the room; 3. The ventilation device according to claim 2, wherein the second magnetic field generating body comprises an iron core extending along the rotation axis, and a portion of the outer periphery of the iron core is magnetically attracted to the receiving surface of the magnet.

4. Further, an open position maintaining means is provided to maintain the open position of the lid at a predetermined angle, the open position maintaining means includes an inclined surface formed on a side edge of the lid on the rotation axis side, The ventilation device described in claim 2, characterized in that when the lid is in the open position at the specified angle, the magnetic force of the main magnetic force holding means causes the inclined surface to press against the indoor side surface of the device main body or a gasket attached to the indoor side surface.

5. Further, an open position maintaining means is provided to maintain the open position of the lid at a predetermined angle, the open position maintaining means includes a support protrusion formed on one side of the lid on the rotation axis side and protruding toward the device body, and a holding recess formed on a surface of the device body facing the interior of the chamber and receiving the support protrusion, The ventilation device described in claim 2, characterized in that the outer periphery of the support protrusion and the inner periphery of the holding recess have a cam shape that restricts rotation of the support protrusion by the magnetic force of the main magnetic force holding means when the lid is in the open position of the predetermined angle.

6. the magnetic force holding means further includes a secondary magnetic force holding means, the secondary magnetic force holding means having a third magnetic field forming body disposed within the device body and a fourth magnetic field forming body disposed on the exterior surface of the lid, at least one of the third and fourth magnetic field forming bodies being formed by a magnet; 3. The ventilation device according to claim 2, wherein the third and fourth magnetic field generating bodies are magnetically attracted to each other when the cover is in the closed position.

7. The ventilation device described in claim 6, characterized in that a filter is removably housed inside the device main body, and a filter holder that holds the filter from the inside of the room is removably housed inside the device main body, and the third magnetic field forming body is provided on the filter holder.

8. The ventilation device according to claim 6, characterized in that a gasket is arranged on the indoor side surface of the device body so as to surround the indoor side opening, and when the lid is in the closed position, the magnetic force of the secondary magnetic force retaining means presses the lid against the gasket.

9. The ventilation device described in claim 2, characterized in that the device body and the lid are formed in an elongated shape, the main magnetic force retaining means is arranged at each of the longitudinal ends of the lid, and a finger hook recess is formed on the indoor side surface of the device body adjacent to at least one of the longitudinal end edges of the lid.

10. The ventilation device described in claim 1, characterized in that the device main body has an outdoor body and an indoor body, the outdoor body is inserted into a hole formed in the outdoor wall of the sash door frame, the indoor body is inserted into a hole formed in the indoor wall of the frame, and the outdoor body and the indoor body are connected so as to sandwich the frame, thereby attaching the device main body to the frame.

11. The ventilation device according to claim 1, characterized in that the device body is formed vertically and is attached to the vertical frame of a sliding sash door, and its upper or lower end is extended in the longitudinal direction, and a pull portion is formed on this extension.

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