JPH07217961A - Air ventilation fan for ceiling - Google Patents

Abstract

PURPOSE:To eliminate a surplus spacing and realize a reduction in the height of a device by a method wherein a spring member fixing part is fixed to a fixing section of a casing, the spring member is rotated around the fixing part so as to perform a removing or a fixing of an ornamental frame. CONSTITUTION:A fixing frame 14 is fixed to a peripheral edge of an opening 12a formed at a ceiling plate 12. A main body case 15 having a blower 17 fixed thereto is fixed with screws to the fixing frame 14. The opening 12a is covered by a removable ornamental frame 24, although under a state in which the ornamental frame 24 is not hooked to a hook part 23d, an arm 23c of a torsion coil spring 23 is lifted up with a torsion force of a coiled part 23a. Then, in the case that the ornamental frame 24 is to be fixed, the hook part 23d of the torsion coil spring 23 is held and pulled down to cause a fitting 24b of the ornamental frame 24 to be engaged with the hook part 23d. Then, the arm 23c is rotated upwardly with the torsion force of the coil part 23a, the ornamental frame 24 is pulled and pressed against the ceiling plate 12, resulting in that it becomes a fixed state in which the opening 12a is covered by it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling ventilation fan which is disposed behind a ceiling of a room and sucks air in the room through an opening of a ceiling plate.

[0002]

2. Description of the Related Art Conventionally, there is a ceiling fan of this type configured as follows. That is, in FIG.
An outer casing 3 is arranged in the ceiling 2 of the room 1, and a blower 4 is arranged in the outer casing 3. Then, when the fan 4a of the blower 4 rotates, the air in the room 1 is sucked from the opening 5a of the ceiling plate 5 into the casing 4b through the intake opening 3a of the outer casing 3 and discharged through the exhaust port 4c. ing.

The casing 4b has a structure shown in FIGS.
A bridge 4d is provided as shown in FIG. The bridge 4d is provided with two supporting portions 4e, and a spring member 6 having a substantially V shape is placed on the supporting portions 4e. Then, as shown in FIG. 17, the metal member 7a of the decorative frame 7 is hooked on the annular portion 6a of the spring member 6, and the decorative frame 7 is expanded by the expanding force of the spring member 6 (indicated by an arrow). It is pulled upward and covers the opening 5a from the room 1 side.

[0004]

In the above structure, when removing the decorative frame 7, the spring member 6 is pulled down together with the decorative frame 7, and the metal fitting 7a of the decorative frame 7 is hung from the annular portion 6a of the spring member 6. Let Therefore, the spring member 6
Is a use position for pressing the decorative frame 7 to the ceiling plate 5 as shown by a solid line in FIG. 18, and as shown by a chain double-dashed line,
The decorative frame 7 expands and contracts with respect to the unused position for hanging the metal fitting 7a, and accordingly, the tip end of the spring member 6 moves along the locus indicated by the chain double-dashed line α.

Therefore, in the conventional configuration, an extra space 8 indicated by the height dimension h must be provided between each support portion 4e and the lower surface of the casing 4b, and as a result, the height dimension of the device is increased. Grows larger. Further, since the bridge 4d for supporting the spring member 6 is provided in the casing 4b, the ventilation resistance is large, which is one of the causes of the deterioration of the ventilation performance.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a ceiling ventilation fan capable of eliminating an extra space and a bridge, downsizing the device, and improving ventilation performance. It is in.

[0007]

A ceiling ventilator according to the present invention is disposed on the ceiling of a room, has an intake opening on the lower surface that faces the inside of the room through an opening of a ceiling plate, and has an exhaust port on the side surface. An outer casing having, a blower arranged in the outer casing and having a fixing portion in a casing, a decorative frame having a holding portion,
One end has a mounting portion fixed to the fixing portion of the casing, and the other end has a hooking portion hooked and held by the holding portion of the decorative frame, and by the upward biasing force, The decorative frame is characterized in that it is provided with a linear spring member that pulls and holds the decorative frame so as to cover the opening of the ceiling plate from the room side.

In this case, a plurality of hook portions of the spring member may be provided or formed in an arc shape having a large radius.
Further, a locking portion for temporarily holding the spring member at a predetermined rotation angle may be provided on the fixed portion of the casing.

Further, the fixed portion of the casing is composed of a pair of parallel ribs integrally formed with the casing, a mandrel is provided between these ribs, and a coil member of the spring member is fitted to the outside of the mandrel. The torsion coil spring may be formed of a torsion coil spring having a hook portion formed on one arm, and the other arm of the torsion coil spring may be applied to the horizontal portion of the casing.

Further, a pair of mandrels facing each other at a predetermined interval are provided on the fixed portion of the casing, and the spring member has a coil portion fitted to the outside of the both mandrels and a hook portion on one arm. The torsion coil spring may be formed so that the coil portion of the torsion coil spring is press-fitted into the gap between the mandrels.

Further, a pair of mandrels facing each other at a predetermined interval are provided on the fixed portion of the casing, and the spring member has a coil portion fitted to the outside of the both mandrels and a hook portion on one arm. The torsion coil spring may be formed so that the coil portion of the torsion coil spring is axially compressible and is inserted into the gap between the mandrels in a compressed state.

[0012]

According to the above means, when the holding portion of the decorative frame is hooked on the hooking portion of the spring member, the decorative frame is pulled and lifted by the upward biasing force of the spring member. The opening of the ceiling board is covered. In this case, unlike the conventional case in which the spring member is expanded and contracted, the spring member rotates around the mounting portion fixed to the casing, so that an extra space can be eliminated. As a result, the height dimension of the device can be reduced by the amount of elimination of the space. Moreover, since the bridge that supports the spring member can be eliminated, ventilation resistance is reduced and ventilation performance is improved.

By the way, the spring member is provided in the casing provided on the back of the ceiling, and the decorative frame is located on the room side. Therefore, if the thickness of the ceiling plate is different, the rotation angle of the spring member hooked from the underside of the ceiling to the holding portion of the decorative frame is different, and the decorative frame is displaced in the horizontal direction. In this respect,
By providing a plurality of hooking portions of the spring member or forming an arc shape having a large radius, the hooking position of the hooking portion with respect to the holding portion can be shifted, and as a result, the horizontal displacement of the decorative frame can be prevented. It can be prevented. Further, since the spring member is urged to rotate upward, it is necessary to hold the spring member when hooking the holding portion of the decorative frame to the hook portion of the spring member. In this respect, if the locking portion for temporarily holding the spring member at a predetermined rotation angle is provided, it is not necessary to grip the spring member.

When a torsion coil spring having a hook portion formed on one arm is used as the spring member, a pair of parallel ribs are integrally formed on the casing, and the coil portion of the torsion coil spring is formed between these ribs. It is conceivable to provide a mandrel to be fitted. In this case, it is necessary to provide a contact member for applying the other arm of the torsion coil spring, but if this contact member is integrally molded between the ribs, the molding die becomes complicated by the corresponding member. In this respect, if the other arm of the torsion coil spring is applied to the horizontal portion of the casing, the abutting member can be eliminated and the molding die can be simplified.

When a torsion coil spring is used as the spring member, it is possible to use a separate component such as a screw as its mandrel. However, in this case, the insertion work for inserting the screw into the coil portion of the torsion coil spring is required, and the workability of mounting the torsion coil spring is reduced. In this respect, if the coil portion of the torsion coil spring is pressed into the gap between the mandrels, or if it is inserted into the gap between the mandrels while being compressed in the axial direction, the screw insertion work becomes unnecessary and the torsion coil spring mounting Workability is improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be described based on. First, in FIG. 1, an opening 12a is formed in a ceiling plate 12 of a room 11.
A mounting frame 14 is attached to the peripheral portion of 2a so as to be located on the ceiling 13 side. A main body case 15 made of an iron plate as an outer casing is screwed to the mounting frame 14 so as to be located on the ceiling 13 side.
On the lower surface of the room 1 through the opening 12a of the ceiling board 12,
An air intake opening 15a that faces the inside is formed. Further, an exhaust port 15b is formed on a side surface of the main body case 15, and a duct 16 communicating with the outdoors is connected to the exhaust port 15b.
It is connected by 6a.

A blower 17 is arranged in the main body case 15. This blower 17 includes a casing 18 made of synthetic resin fixed to the inner surface of the main body case 15, and a motor 19.
And a fan 20 attached to the rotary shaft of the motor 19.
And a suction port 18a is formed on the lower surface of the casing 18. Further, as shown in FIG. 2, a rib 21 as a fixing portion is integrally formed on the lower surface of the casing 18. The rib 21 has a substantially U-shape, and the parallel mounting walls 21a and 21a are provided with the pilot holes 2 respectively.
1b and 21b are formed, and a stepped screw 22 as a mandrel is tightened in each pilot hole 21b, as shown in FIG.

A coil portion 23a of a torsion coil spring 23, which is a linear spring member, is fitted on the outer peripheral side of the stepped screw 22, whereby the torsion coil spring 23 is formed into the rib 21.
Installed on. That is, the coil portion 23a of the torsion coil spring 23 functions as a mounting portion. Then, as shown in FIG. 4, one arm 23b of the torsion coil spring 23 is applied to the contact wall 21c of the rib 21, and the other arm 23c is positioned at the tip thereof and hooked 23d.
Are formed. The hook portion 23d is formed by bending the end portion of the arm 23c, and has a semicircular arc shape that opens upward.

A convex portion 24a is integrally formed on the upper surface of the decorative frame 24, and a metal fitting 24b as a holding portion is screwed to the convex portion 24a. Then, the hooking portion 23d of the torsion coil spring 23 is hooked on the metal fitting 24b, and the decorative frame 24 is pulled up and lifted by the upward turning force of the arm 23c, and is pressed against the ceiling plate 12 so as to contact the ceiling plate 12. It covers the opening 12a. Further, a plurality of intake holes 24c are formed in the decorative frame 24. In FIG. 1, when the motor 19 is driven, the fan 20 is rotated and the air in the room 11 is changed from the intake holes 24c of the decorative frame 24 to the ceiling plate. The opening 12a of 12 → the intake opening 15a of the main body case 15 → the intake port 18a of the casing 18 are sucked into the casing 18 in this order, and are exhausted to the outside through the duct 16 from the exhaust port 15b.

Next, the procedure for attaching and detaching the decorative frame 24 will be described. First, as shown by the chain double-dashed line in FIG.
When the decorative frame 24 is not hooked on the arm 23c, the arm 23c of the torsion coil spring 23 is lifted upward by the twisting force of the coil portion 23a. From this state, the hook portion 23d of the torsion coil spring 23 is grasped, the arm 23c is pulled down toward the room 11 side, and the metal fitting 24b of the decorative frame 24 is hooked on the hook portion 23d, whereby the arm 23c is twisted by the coil portion 23a. The decorative frame 24 is rotated upward, and the decorative frame 24 is pulled and brought into pressure contact with the ceiling plate 12. To remove the decorative frame 24, the decorative frame 24 is pulled down against the twisting force of the coil portion 23a, and the metal fitting 24b is removed from the hook portion 23d.

According to the above embodiment, the torsion coil spring 2
Since the coil portion 23a of No. 3 is attached to the rib 21 of the casing 18 and the arm 23c is rotated about the coil portion 23a, an extra space portion can be eliminated unlike the conventional case in which the spring member is expanded and contracted. . As a result, the height dimension of the main body case 15 can be made smaller than in the conventional case. Moreover, since the bridge supporting the spring member can be eliminated, ventilation resistance is reduced, and as a result, ventilation performance is improved.
When the main body case 15 having the same height as the conventional one is used, a larger blower 17 can be provided, and the ventilation performance can be further improved.

In particular, in the above-described embodiment, since the torsion coil spring 23 in which only one arm 23c is bent is used as the spring member, compared with the conventional V-shaped spring member shown in FIG. The shape of the spring member can be simplified, and the cost can be reduced. Further, since the rib 21 is formed in a U shape, the rigidity of the rib 21 is improved.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
Only different members will be described. First, in FIG. 5, the arm 23c of the torsion coil spring 23 is provided with, for example, three hook portions 23e. Each of these hooks 23
e is formed by bending the end portion of the arm 23c, and each has a semicircular arc shape.

By the way, as shown in FIG. 4, the torsion coil spring 23 has a casing 18 arranged in the ceiling space 13.
And the decorative frame 24 is located on the room 11 side.
Therefore, when the plate thickness T of the ceiling plate 12 is different, when the hook portion 23d of the torsion coil spring 23 is hooked on the metal fitting 24b of the decorative frame 24, the rotation angle of the arm 23c is different. As a result, the hook portion 23d is displaced in the horizontal direction, and consequently the decorative frame 24 is also displaced in the horizontal direction. Further, as shown in FIG. 6, the main body case 15 may be attached to the upper surface of the attachment frame 14, and in this case as well, for the same reason that the plate thickness T of the ceiling plate 12 is different, the decorative frame 24
Is displaced in the horizontal direction.

In this respect, according to the present embodiment, since the plurality of hook portions 23e are provided, as shown by the alternate long and short dash line in FIG. The decorative frame 24 so that the decorative frame 24 is positioned at the center (specifically, the center of the decorative frame 24 is substantially aligned with the centers of the intake opening 15a of the main body case 15 and the opening 12a of the ceiling plate 12).
The metal fitting 24b can be selectively hooked on the hook portion 23e. As a result, regardless of the plate thickness T of the ceiling plate 12, the horizontal displacement of the decorative frame 24 can be prevented.

In the second embodiment, the arm 23c
Although three hook portions 23e are formed in the above, two or four hook portions 23e may be formed, and the point is that a plurality of hook portions 23e may be formed.

Next, a third embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. That is, the torsion coil spring 23
The arm 23c has a hooking portion 23f formed by bending the end portion thereof. In this case, the hook 23f
Has an arcuate portion 23g and a straight portion 23h having a larger radius than the hooking portion 23d of the first embodiment,
Moreover, a gap 23i is formed between the arcuate portion 23g and the straight portion 23h.

According to this embodiment, the metal fitting 24 of the decorative frame 24
When hooking b on the hook portion 23f, the gap 23i
From the arcuate portion 23g and the straight portion 23h to the metal fitting 24b
Insert. Then, as shown by the one-dot chain line, regardless of the rotation angle of the arm 23c of the torsion coil spring 23, the decorative frame 2
Since the position of the arcuate portion 23g with respect to the metal fitting 24b is automatically deviated in accordance with the plate thickness T of the ceiling plate 12 so that 4 is located in the central portion, the decorative frame 24 as in the second embodiment.
Can be prevented from being displaced in the horizontal direction.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. That is, the rib 21 of the casing 18 is provided with a convex portion 21d as a locking portion located on the inner surface of the one mounting wall 21a. This convex portion 21d
Is integrally formed with the rib 21, and the upper surface thereof has an inclined surface shape and the lower surface thereof has a horizontal surface shape.

By the way, the arm 23 of the torsion coil spring 23
Since c is urged to rotate upward, the decorative frame 2
The metal fitting 24b of No. 4 is twisted, and the hook portion 23d of the coil spring 23 is
The arm 23c must be grasped before it is hooked on. In this point, according to the present embodiment, as shown by the chain double-dashed line in FIG. 8, if the arm 23c is rotated downward and locked to the lower surface of the convex portion 21d, the arm 23c needs to be gripped. Is eliminated, and the work of hooking the metal fitting 24b is simplified. In particular, in this embodiment, since the upper surface of the convex portion 21d is formed in an inclined surface shape, when the arm 23c is rotated downward, the arm 23c
As c follows the inclined surface of the convex portion 21d, it smoothly rides over the convex portion 21d.

Although the torsion coil spring 23 is used as the spring member in each of the first to fourth embodiments described above, the present invention is not limited to this, and for example, a spring member is formed in a linear shape. The above may be used, and the point is that it has a force to rotate upward.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 9 and 10. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. That is, on the lower surface of the casing 18, a pair of parallel ribs 25, 25 as a fixed portion are integrally formed.
A stepped screw 22 is tightened between the five. And
The coil portion 23a of the torsion coil spring 23 has a stepped screw 2
2 is fitted on the outer peripheral side, and the arm 23b has the casing 1
8 is applied to the horizontal portion 18b, and the length dimension L is the first
It is set longer than in the example.

According to this embodiment, the torsion coil spring 23
Since the arm 23b is applied to the horizontal portion 18b of the casing 18, the contact wall 21c shown in FIG. 4 can be eliminated, and the molding die for molding the casing 18 can be simplified accordingly.
In addition, since the arm 23b can be lengthened accordingly, the twisting force of the coil portion 23a is applied to the casing 1 via the arm 23b.
8 and thus the casing 18
It is possible to prevent local stress from acting on the.

Next, a sixth embodiment of the present invention will be described with reference to FIGS. 11 and 12. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. First, FIG.
In the lower surface of the casing 18, a pair of parallel ribs 26, 26 as fixed portions are integrally formed, and the mandrel 27, 27 is integrally formed on the inner surface of each rib 26 in a facing state.

In this case, the tip surface of each mandrel 27 is shown in FIG.
As shown in FIG. 5, the coil portion 23a of the torsion coil spring 23 has an axial direction in which the coil portion 23a of the torsion coil spring 23 is axially formed so as to be inclined inward as it goes upward. Compression length A when compressed to
(See FIG. 11), and the distance L2 between the upper portions is set to be slightly smaller than the compression length A. Then, the coil portion 2 of the torsion coil spring 23
3a is fitted on the outer peripheral side of each mandrel 27, and the arm 23b of the torsion coil spring 23 is adapted to be applied to the horizontal portion 18b (see FIG. 10) of the casing 18.

According to this embodiment, the torsion coil spring 23
When attaching the coil portion 23a of the above to the ribs 26, 26, the coil portion 23a is compressed in the axial direction to
3a is press-fitted into the gap between the mandrels 27, 27 from below. Then, as shown by the chain double-dashed line in FIG.
6 bends outward, the coil portion 23a is pushed along the inclined surface portion 27a of each mandrel 27, and then fitted to the mandrel 27, 27. Therefore, the insertion work for inserting the stepped screw 22 into the coil portion 23a becomes unnecessary, and the torsion coil spring 23
The mounting workability of is improved. Moreover, the torsion coil spring 2
Since the third arm 23b is applied to the horizontal portion 18b of the casing 18, the same effect as that of the fifth embodiment can be obtained.

Next, a seventh embodiment of the present invention will be described with reference to FIGS. 13 and 14. The same members as those in the sixth embodiment will be designated by the same reference numerals and description thereof will be omitted, and only different members will be described below. First, FIG.
In the above, the mandrel 28 is integrally formed on the inner surface of each rib 26 in a facing state. In this case, as shown in FIG. 14, the tip end surface of each mandrel 28 has a vertical surface shape, and the interval dimension L3 between the vertical surface portions 28a, 28a is the compression length A of the coil portion 23a (see FIG. 11). ) Is set slightly larger than.

Further, as shown in FIG. 13, each rib 26,
The distance L4 between the inner surfaces of 26 is set to be slightly smaller than the free length A'when the coil portion 23a is in the natural state. Then, when the coil portion 23a is fitted to the outer peripheral side of each mandrel 28, both end surfaces of the coil portion 23a are brought into pressure contact with the inner surface of each rib 26. Although not shown, the arm 23b of the torsion coil spring 23 is
It is adapted to be applied to the horizontal portion 18b (see FIG. 10).

According to this embodiment, the torsion coil spring 23
When attaching the coil portion 23a of the above to the ribs 26, 26, the coil portion 23a is compressed in the axial direction to
3a is inserted in the gap between the mandrels 28, 28. When the compressive force is released, the coil portion 23a extends in the axial direction and is fitted into the mandrel 28, 28, and both end faces thereof are pressed against the inner faces of the ribs 26.

Therefore, as in the sixth embodiment, the work of inserting the stepped screw 22 into the coil portion 23a is unnecessary, and the workability of mounting the torsion coil spring 23 is improved.
Moreover, since both end surfaces of the coil portion 23a are pressed against the inner surfaces of the ribs 26, the coil portion 23a can be prevented from falling and rattling, and the arm 23c can exert a stable turning force. Moreover, since the arm 23b of the torsion coil spring 23 is applied to the horizontal portion 18b of the casing 18, the same effect as that of the fifth embodiment can be obtained.

Next, an eighth embodiment of the present invention will be described with reference to FIG. The same members as those of the seventh embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. That is, no mandrel is formed on both ribs 26, and the coil portion 23 a of the torsion coil spring 23 is inserted into the gap 29 between both ribs 26. The arm portion 23b of the torsion coil spring 23 is formed with a ring portion 23j as a mounting portion by bending the end portion thereof, and the torsion coil spring 23 inserts the screw 30 inserted in the ring portion 23j into the casing 18b. It is fixed to the horizontal portion 18b of the casing 18 by being tightened in the lower hole 18c. That is, in the present embodiment, both ribs 26 function not as fixing parts but as position deviation preventing parts for preventing position deviation of the coil part 23a, and the screws 30 function as fixing parts.

According to this embodiment, the torsion coil spring 23
Since the arm 23b of the contact member is applied to the horizontal portion 18b of the casing 18, the contact wall 2 shown in FIG.
1c can be eliminated, and the molding die for molding the casing 18 can be simplified accordingly. Moreover, since the arm 23b of the torsion coil spring 23 can be lengthened, the twisting force of the coil portion 23a is distributed to the casing 18 via the arm 23b.

Next, a ninth embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. That is, the boss 31 as a fixing portion and the two vertical walls 32 and 33 are integrally formed on the lower surface of the casing 18. In this case, one vertical wall 32 is substantially L-shaped, and the other vertical wall 33 is a combination of a substantially L-shaped vertical wall and a straight vertical wall.

A coil portion insertion portion 34a, a first lead-out portion 34b and a second lead-out portion 34c are formed between the vertical walls 32 and 33, and the coil portion 23a of the torsion coil spring 23 is a coil. Arm 2 inserted in the part insertion portion 34a
3b and 23c are led out through the first and second lead-out portions 34b and 34c. The arm 23b of the torsion coil spring 23 is formed with an arcuate portion 23k as a mounting portion by bending the end portion thereof. The arc-shaped portion 23k has a semi-circular shape having an opening 23m and is hooked on the boss 31 of the casing 18.

According to this embodiment, the torsion coil spring 23
When mounting, the coil portion 23a of the torsion coil spring 23 is inserted into the coil portion insertion portion 34a. At the same time, the opening 23m of the arcuate portion 23k is applied to the neck portion 31a of the boss 31 and pushed into the neck portion 31a. Then, the arcuate portion 23k is expanded in diameter and fitted into the neck portion 31a, and moreover, the head portion 31b of the boss 31 holds it in a retaining state. Therefore, the same effects as those of the ninth embodiment can be obtained, and the screw 30 for mounting the torsion coil spring 23 can be obtained.
Can be abolished and can contribute to cost reduction.

In each of the first to ninth embodiments, the metal fitting 24b is fixed to the convex portion 24a of the decorative frame 24,
Although the metal fitting 24b is used as the holding portion, the present invention is not limited to this. For example, a substantially L-shaped convex portion may be integrally formed on the decorative frame 24, and the convex portion may be used as the holding portion.

[0047]

As is apparent from the above description, the ceiling ventilation fan of the present invention has the following excellent effects. According to the means described in claim 1, since the attachment portion of the spring member is attached to the fixed portion of the casing and the spring member is rotated about the attachment portion, the extra space can be eliminated. As a result, the height of the device can be reduced and the bridge supporting the spring member can be eliminated, so that the ventilation resistance is reduced and the ventilation performance is improved.

According to the means described in claims 2 and 3, since the hooking position of the hooking portion with respect to the holding portion can be shifted so that the decorative frame is located at the central portion, the position of the decorative frame in the horizontal direction is displaced. Can be prevented. According to the means described in claim 4, in the state where the spring member is temporarily held at a predetermined rotation angle,
Since the holding portion of the decorative frame can be hooked on the hooking portion of the spring member, the hooking operation becomes easy.

According to the means described in claim 5, even when the torsion coil spring is used as the spring member, it is not necessary to specially provide the abutment member for applying the arm of the torsion coil spring, so that the molding die can be simplified. According to the means described in claims 6 and 7, even when the torsion coil spring is used as the spring member, it is not necessary to insert a separate component such as a screw into the coil portion of the torsion coil spring. Is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a lower surface of a casing, a torsion coil spring, and the like.

FIG. 3 is an enlarged bottom view showing a mounted state of a torsion coil spring.

FIG. 4 is a vertical cross-sectional view showing how the decorative frame is attached.

FIG. 5 is a vertical cross-sectional view of the lower surface of the casing showing the second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view for explaining the reason why the makeup frame is displaced in the horizontal direction.

FIG. 7 is a view corresponding to FIG. 5 showing a third embodiment of the present invention.

FIG. 8 is a perspective view of a rib portion showing a fourth embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 8 showing a fifth embodiment of the present invention.

FIG. 10 is an enlarged vertical sectional view showing a rib portion.

FIG. 11 is a vertical sectional view of a rib portion showing a sixth embodiment of the present invention.

FIG. 12 is a vertical cross-sectional view showing an enlarged end portion of a mandrel.

FIG. 13 is a view corresponding to FIG. 11 showing a seventh embodiment of the present invention.

FIG. 14 is a view corresponding to FIG.

FIG. 15 is an exploded perspective view of a torsion coil spring portion showing an eighth embodiment of the present invention.

FIG. 16 is a view corresponding to FIG. 15 showing a ninth embodiment of the present invention.

FIG. 17 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 18 is a view corresponding to FIG.

[Explanation of symbols]

11 is a room, 12 is a ceiling plate, 12a is an opening, 13 is the ceiling, 15 is a main case (outer casing), 15a is an intake opening,
15b is an exhaust port, 17 is a blower, 18 is a casing, 1
8b is a horizontal part, 21 is a rib (fixed part), 21d is a convex part (locking part), 22 is a stepped screw (mandrel), 23 is a torsion coil spring (spring member), and 23a is a coil part (mounting part). , 23b and 23c are arms, 23d to 23f are hooking parts, 23j is a ring part (mounting part), 23k is an arc-shaped part (mounting part), 24 is a decorative frame, 24b is a metal fitting (holding part),
Reference numerals 25 and 26 are ribs (fixed portions), 27 and 28 are mandrels, 30 is a screw (fixed portion), and 31 is a boss (fixed portion).

Claims (7)

[Claims] 1. An outer casing, which is disposed on the ceiling of a room, has an intake opening facing the inside of the room through an opening of a ceiling plate on a lower surface, and an exhaust port on a side surface, and is disposed in the outer casing. A casing having a fixed part, a decorative frame having a holding part, an attachment part fixed to the fixed part of the casing at one end, and hooked to the holding part of the decorative frame at the other end. A ceiling having a hook portion to be held, and a linear spring member for pulling and holding the decorative frame by an upward biasing force so as to cover the opening of the ceiling plate from the room side. Ventilation fan. 2. The ventilation fan for a ceiling according to claim 1, wherein a plurality of hook portions of the spring member are provided. 3. The ceiling ventilation fan according to claim 1, wherein the hooking portion of the spring member is formed in an arc shape having a large radius. 4. The ceiling according to claim 1, wherein the casing fixing portion is provided with a locking portion for temporarily holding the spring member at a predetermined rotation angle. Ventilation fan. 5. The fixed portion of the casing is composed of a pair of parallel ribs integrally formed with the casing, a mandrel is provided between these ribs, and a coil portion of the spring member is provided outside the mandrel. 2. A torsion coil spring which is fitted and has a hook portion formed on one arm, and the other arm of the torsion coil spring is applied to a horizontal portion of the casing. The ventilation fan for ceiling according to any one of 4. 6. A fixed portion of the casing is provided with a pair of mandrels facing each other with a predetermined interval, and the coil member of the spring member is fitted to the outside of the mandrels and hooked on one arm. 2. A torsion coil spring having a portion formed therein, and the coil portion of the torsion coil spring is press-fitted into a gap between the mandrels.
The ventilation fan for ceiling according to any one of 1 to 4. 7. A fixed part of the casing is provided with a pair of mandrels facing each other at a predetermined interval, and a coil of the spring member is fitted to the outside of the mandrels and hooked on one arm. The torsion coil spring is formed of a torsion coil spring, and the coil portion of the torsion coil spring is compressible in the axial direction.
Moreover, it is adapted to be inserted into the gap between the mandrels in a compressed state.
The ventilation fan for ceiling according to any one of.