JP2002295141A - Sash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bottom frame of sash for draining water accumulated at the indoor side of the bottom frame of sash without deteriorating the watertightness as well as thermal insulation. SOLUTION: Drain holes are made at the top face and the exterior side face of the bottom frame of the sash, a water stop member is provided between inner and outer rails below the meeting face of shojis when fully closed, a cover body having drain holes at the end portion and the intermediate portion between the inner and outer rails at the indoor side having no inner paper screen when fully closed is inserted, and water accumulated at the indoor side is drained to the outdoor side through a water drain hole in the cover body and a water drain hole of the bottom frame of the sash in the hollow body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sash, and more particularly, to a sash lower frame of a sash provided on the inner surface of the periphery of an opening of a building.

[0002]

2. Description of the Related Art Conventionally, a sash made of an aluminum sash, a sash made of a resin, or a sash made of a combination of aluminum and a resin has been used as a frame material for a sliding type sliding door at the opening of a building because of its good airtightness and sound insulation. Is widely used.

FIG. 7 illustrates a conventional sash to which a sliding type shoji is attached. FIG. 7 is a longitudinal sectional view of the conventional sash. Reference numerals 1 and 2 denote a sash upper frame and a sash lower frame provided in upper and lower inner frames of the opening of the building, which are provided together with left and right side frames of the opening (not shown). A sash frame is provided on the side.

The upper sash frame 1 comprises an upper outer sash frame 4 and an upper inner sash frame 5 connected by a bridge member 17 made of resin. The upper sash outer frame 4 and the upper upper sash frame 5 include: Guide members 6 and 6 for guiding the outer sash 11 and inner sash 12 and a guide member 6 for guiding the screen door 26 are formed. The sash lower frame 2 is connected to the sash lower outer frame 7 by a resin bridge member 17.
The inner rail 10 having a notch for drainage and cleaning of the lower frame is provided over the entire length of the lower inner frame 8 of the step portion having a height on the inside, Also,
An outer rail 9 having a notch for draining and cleaning the lower frame over its entire length and a screen door rail 24 outside the lower frame are provided on the lower sash lower frame 7 having a low step.

[0005] The outer sash 11 supported by the outer rail 9 of the lower sash outer frame 7 and the guide member 6 of the upper sash outer frame 4 is interposed between the upper sash frame 13 and the lower sash frame 15. In the upper part of the outer sliding door 13, a guide recessed part for guiding the guide member 6 is formed, and in the lower sliding door 15, a door wheel 23 is stored. At the same time, an extension 20 of the lower frame of the outer sash is extended downward at the front of the outer side of the lower frame 15 of the outer sash, and an airtight material 21 slidingly in contact with the sliding side surface 22 of the lower sash frame seal is provided at the edge thereof. Installed. Glass 19 is attached to the upper and lower frames via a sealing material 18, and the glass 19 and the glass 19 are separated by a spacer 27, thereby improving heat insulation and sound insulation.

An inner sash 12 supported by the inner rail 10 of the lower sash inner frame 8 and the guide member 6 of the upper sash upper frame 5.
Consists of glass 19, 19 interposed between the inner sash door upper frame 14 and the inner sash door lower frame 16.
A guide recess for guiding the guide member 6 is formed in the upper part of the door, and a door roller 23 is housed in the inner sash door lower frame 16. Glass 19 is attached to the upper and lower frames via a sealing material 18, and the glass 19 and the glass 1 are attached.
Reference numerals 9 are separated by spacers 27 to enhance heat insulation and sound insulation.

The sash lower outer frame 7 and the sash lower inner frame 8
In the sash lower frame 2 configured by the above, a step is provided so that the sash lower inner frame 8 is higher.
Of the outer rail 9 formed on the lower sash outer frame 7 and the inner rail 10 formed on the lower inner sash frame 8, the inner rail 10 of the lower inner sash frame 8 is higher by the height H. As a result, the lower end of the inner sash 12 is higher than the lower end of the outer sash 11 by the height H. Thus, the sash lower frame 2
The step is provided in the inner and outer sash lower frames to ensure a watertight structure and watertight performance to prevent water from entering the indoor side from the gap between the sash lower frame provided in the opening and the shoji. That's why.

In particular, when a typhoon or the like causes strong wind and rain, the outer shoji 1
The wind and rain spraying on the inner and outer shojis 11 and 12 when the inner shroud 1 and the inner shroud 12 are fully closed enter the room side through a slight gap between the sash and the lower end of the shoji, and the portion between the outer rail 9 and the inner rail 10 and the inner rail 10 Water accumulates in the space between the sash lower frame and the inside edge.

[0009] The accumulated water is slightly lower than the upper end of the inner rail 10 on the indoor side. However, the pressure due to the difference in water level accumulated on the indoor side and the water accumulated on the outside of each of the sliding doors are caused by wind pressure. This balances the pressure of the water that tries to enter the room so that no more water enters the room. In other words, by employing the sash lower frame having a step as described above, a so-called water sump method is adopted in which the pressure of water accumulated on the indoor side of the lower sash frame and the pressure of water due to wind pressure on the outdoor side are balanced. Have been.

[0010]

However, in the conventional puddle method using a sash lower frame having a step, as described above, when the outer sash 11 and the inner sash 12 are fully closed, the outer rail 9 is closed.
Although water will collect in the area between the inner rail 10 and the indoor side, there is no particular inconvenience even if water accumulates in this area, but since water accumulates for the inhabitants, This would give a feeling of anxiety that water might enter the room sometime, and if water had accumulated, the hem of the curtain could get inside and get wet and dirty.

In order to prevent water from collecting in the portion between the outer rail 9 and the inner rail 10 on the indoor side, a drain hole is provided at an appropriate position on the side surface of the outer rail 9. If water is drained, it is possible to prevent water from accumulating. However, when the weather is strong such as a typhoon, water will rather enter the room from the drain hole. Further, if a large notch is formed at the end of the outer rail 9 in order to prevent water from pooling on the indoor side of the outer rail 9, the collected water is drained.
Even if 1 and inner sash 12 are fully closed,
In winter, cold cold air enters the room, while warm air in the room flows outside, and in summer, hot air enters the room. Then, while using the sash, there is a problem in terms of heat insulation performance and airtightness.

In view of the above, the present invention has been made in view of the above-mentioned problem, and has an upper surface of a hollow sash lower frame as a substantially flat sash lower frame, and an outer rail and an inner rail are provided on the upper surface of the sash lower frame. A notch for draining and cleaning is provided at an end of the outer rail, and a drain hole and a drain hole with a drain valve are provided on an upper surface and an outer surface of the sash lower frame. The airtight material provided in the extension of the lower frame slides below the notch of the outer rail, and slides below the notch portion when the inner and outer rails provided on the upper surface of the sash lower frame are fully closed. A water blocking member is provided between the inner and outer rails, and a cover body having a drain portion provided between the inner and outer rails within a certain range of the sash when the door is fully closed is provided, and water collected on the indoor side of the sash lower frame is removed by the cover body. Through the water drain hole, hollow body sash lower frame drain hole, drain hole with drain valve It is an object to provide a sash sill which is adapted to drain the side.

[0013]

In order to achieve the above object, according to the first aspect of the present invention, in a sash frame provided on the inner side of four sides of an opening of a building,
An outer rail and an inner rail are provided with a hollow interior and a substantially flat upper surface, and a notch for drainage and cleaning is provided at an end of the outer rail, and a lower frame of a sash supported by the outer rail is provided. The airtight material provided in the extension of the outer rail slides below the notch of the outer rail, and a water-stopping member is provided between the inner and outer rails below the joining portion of the inner and outer shojis. A cover body provided with a drain portion is disposed between the outer rail and the inner rail, and a drain hole with a drain valve is provided on an outer surface of the hollow sash lower frame to cover water accumulated on the cover body. It is characterized in that water is drained from a drain portion of a body, through a hollow portion of a sash lower frame, and through a drain hole with a drain valve.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sash lower frame according to the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a portion where a sash lower frame and an inner sash are provided according to the present invention, and FIG. 2 is a longitudinal sectional view of a portion where a sash lower frame and an outer sash are provided at a portion provided with a drain valve of the present invention. FIG. 3 is a schematic plan view of the sash lower frame of the present invention, FIG. 4 is a vertical sectional view taken along the line II in FIG. 3, and FIG. 6
FIG. 4 is a vertical cross-sectional view taken along the line c-a of FIG.

As shown in FIG.
Is a sash lower frame of the present invention, in which a sash lower outer frame 30 and a sash lower inner frame 8 are connected by a bridge member 17 in the same manner as a conventionally known sash lower frame. The lower sash outer frame 30 is a hollow body having a substantially rectangular cross section, and has upper and lower upper surfaces 31 of the lower sash outer frame and lower surfaces 33 of the lower sash outer frame. The outer rail 3 is provided on the upper surface 31 of the lower frame of the sash.
2 and a screen door rail 24 are formed. On the outer rail 32, a door wheel 23 provided on the outer sash screen lower frame 15 below the outer sash screen 11 is placed so that the outer sash screen 11 can be freely opened and closed.
A screen door 26 is movable on the screen door rail 24.

The sash lower inner frame 8 is a rectangular hollow body having a substantially vertically elongated cross section, and has an inner rail 10 formed on the upper surface thereof. The inner rail 10 is formed on the upper surface of the sash lower inner frame 8. In addition, a door roller 23 provided on an inner sash lower frame 16 below the inner sash 12 is placed on the inner rail 10 so that the inner sash 12 can be freely opened and closed. The upper end of the outer rail 32 provided on the upper surface 31 of the lower outer frame of the sash and the upper end of the inner rail 10 provided on the upper surface of the inner frame 8 of the lower sash have substantially the same height.

Glasses 19, 19 are attached to the inner and outer sashes 11, 12 via seal members 18, respectively. Reference numeral 27 denotes the glass 19 and the glass 1 attached to the frame.
The spacers for keeping the intervals of 9 are used to enhance the heat insulation and sound insulation by making the glass double. In addition, the front part of the outer side of the outer sash frame 15 is extended downward from the extension 20 of the outer sash frame, and the edge thereof is
The airtight material 21 that is in sliding contact with the outer surface of the outer rail 32 is attached.

The indoor side of the outer sash lower frame 15 and the inner sash lower frame 16
The heat insulating cover 34 and the heat insulating cover 3
A heat insulating cover 35 is fitted and mounted on the upper surface 31 of the lower frame of the sash, the other end of the heat insulating cover 35 is mounted on the side surface of the inner rail 10, and the upper surface of the inner frame 8 of the lower sash is heat-insulated. It is covered with a cover 36. The sash lower inner frame 8, the outer sash lower frame 15, and the inner sash lower frame 16 exposed to the indoor side in this way are made of aluminum and are exposed to the outside air, and are particularly cooled in winter. It is a heat insulating cover for preventing dew condensation without being exposed to the outside, and also for preventing deterioration of bridge materials of indoor and outdoor sashes.

Next, FIG. 2 is a longitudinal sectional view of the lower sash frame at a portion where the drain valve of FIG. 1 is provided. The lower sash outer frame 30 of the lower sash frame 29 has water on the upper surface 31 of the lower sash outer frame. A drain hole 40 is formed, and a drain valve 40 is mounted on a side surface on the outdoor side of the sash lower outer frame 30 by a hinge 39 so as to be openable and closable in the arrow direction.
A drain hole 41 closed by 0 is formed. Further, a cover body 51 is provided on the upper surface 31 of the lower frame of the sash.
Are fitted and placed between the outer rail 32 and the inner rail 10. And the outer rail 1 of this cover body 51
A drain hole 43 is provided in the upper surface near the zero. A drain hole 482 is formed in the heat insulating cover 36 provided in the groove on the indoor side of the inner rail 10.

The drain valve 40 drains water collected on the upper surface of the sash lower frame 29 from the drain hole 41 to the outside of the room through the drain hole 42 and the upper surface of the lower surface 33 of the lower sash outer frame. However, on the other hand, rainwater caused by wind pressure
The backflow or blowing into the room through the hollow portion of 0 is prevented.

FIG. 3 is a schematic plan view of the lower frame of the sash.
Reference numerals 5 and 45 denote sash vertical frames attached to the left and right inner sides of the opening, and a sash lower frame 29 is attached between lower ends of the left and right sash vertical frames 45 and 45. The sash lower frame 29 includes the outer rail 32, the inner rail 10, and the screen door rail 2.
The outer rail 32 and the inner rail 10 are provided with an outer sash 11 and an inner sash 12. When the outer sash 11 and the inner sash 12 are fully closed, the end of the outer rail 32 near the sash vertical frame 45 on the side where the outer sash 11 contacts, and the end of the inner rail 10 near the sash vertical frame 45. Has the code 4
A notch for draining and cleaning is formed as shown at 8, and drain holes 48 are formed at appropriate positions on the inner rail 10 and the outer rail 32.
1 and 481 are formed, and a stopper member 46 is attached to one end of the inner rail 10.

When the shoji is completely closed, the outer rail 32 and the inner rail 10 are located between the outer rail 32 and the inner rail 10 at the portion where the outer shoji 11 and the inner shoji 12 are joined.
A water blocking member 50 having a drain hole 49 and a water stopping fold 47 is fitted and installed. In particular, when the sliding door is fully closed, the water blocking member 50 is collected between the outer rail 32 and the inner rail 10 outside the inner sliding door 12. This is a member for preventing water from flowing into the room side between the two rails, and a plurality of water stop members on the upper and lower surfaces of the water stop member 50 so as not to hinder the opening and closing of the inner and outer shojis 12 and 11. Water is stopped by providing a water fold 47.

The outer side of the outer sash 11 between the outer rail 32 and the inner rail 10 when the sash is fully closed,
A cover body 51 having substantially the same length from the sash vertical frame 45 that comes into contact with the sash lower frame member 50 to the water stopping member 50 is fitted in a state of being floated from the upper surface of the sash lower frame 29. The cover body 5
A plurality of drainage holes 43, 4 are located near one sash vertical frame 45.
3 are provided.

FIG. 4 is a vertical sectional view taken along the line II in FIG. 3. The sash lower outer frame 30 of the sash lower frame 29 has a drain hole 42 formed in the upper surface 31 of the sash lower outer frame. A drain valve 40 is provided on the side surface of the sash lower outer frame 30 on the outdoor side with the hinge 3.
9, a drain hole 41 is formed so as to be openable and closable in the direction of the arrow, and is closed by the drain valve 40. The drain valve 40 drains water collected on the upper surface of the lower sash frame 29 from the drain hole 41 to the outside of the room through the drain hole 42 and the upper surface of the lower surface 33 of the lower sash outer frame. On the other hand, rainwater caused by wind pressure
The backflow or blowing into the room through the hollow portion of 0 is prevented. A cover body 51 having a plurality of drain holes 43 is provided on the upper surface of the sash lower frame 29.

A drain hole is formed at an appropriate location at the boundary between the inner rail 10 and the upper surface of the lower sash inner frame 8. Reference numeral 36 denotes a heat insulating cover that covers the upper surface of the sash lower inner frame 8 and has a drain hole in an appropriate position. Reference numeral 54,
Reference numeral 55 denotes a frame opening and an opening lower frame member, and the sash lower frame 29 is attached to the opening lower frame member 55 by screws 56. Reference numeral 57 denotes a cover of the sash lower frame 29, which is an edge decoration.

FIG. 5 is a longitudinal sectional view taken along the roll line of FIG. 3 and shows a joint portion of the outer sash 11 and the inner sash 12 when fully closed and is installed between the outer rail 32 and the inner rail 10. Water stop member 50
Prevents the water accumulated between the outer rail 32 and the inner rail 10 that is the outdoor side of the inner sash 12 from entering the indoor side under the mating portion. FIG. 6 is a vertical sectional view taken along the line C-A of FIG. 3 and shows a state in which one end of the inner sash 12 abuts on the sash vertical frame 45.

The drainage and drainage of water collected on the indoor side by the sash lower frame of the present invention shown in FIGS. 1 and 2 and FIGS. First, the case shown in FIG. 2 will be described.
Even when the shoji is completely closed, water entering the room from a small gap between the inside and outside shoji due to the wind pressure of the wind blowing on the glass surface, and the glass and the inner shoji 12 on the indoor side surface of the outer shoji 11
Of dew on the glass in the room falls down along the glass surface, and falls on the heat insulating cover 36 on the inner side of the inner rail 10 of the inner sash 12, and the outer rail 32 and the inner rail 10.
Accumulate between

The water collected on the heat insulating cover 36 on the indoor side of the inner rail 10 of the inner sash 12 is drained from a drain hole 481 formed at an appropriate position of the inner rail 10 by the outer rail 32 and the inner rail 10. Between the pools of water
Drain holes 43 formed at the end and middle of cover body 51
From the upper surface 31 of the lower frame of the sash, and from the drain hole 42 provided in the upper surface 31 of the lower frame of the sash, the lower surface 3 of the lower frame of the sash is formed.
3, the drain valve 40 is pushed out from a drain hole 41 provided on the outer surface of the lower sash outer frame 30, and the lower sash lower frame 30 is opened.
(See black line in FIG. 2). At this time, the drain valve 40 is pushed and opened outward by the water from the drain hole 41, but is not opened by the wind blown from the outside, so that the water does not enter the inside of the sash lower outer frame 30 or the upper part thereof. Absent.

Next, the case shown in FIGS. 3 to 6 will be described. Water entering into the room due to the wind pressure of the wind blowing on the glass surface even when the shoji is completely closed, and dew water condensed on the glass of the shoji in the room, Each falls down along the glass surface, and the heat insulating cover 36 on the inner side of the inner rail 10 of the inner sash 12.
And between the outer rail 32 and the inner rail 10. Water accumulated on the heat-insulating cover 36 on the indoor side of the closed inner sash 12 passes through the heat-insulating cover 36 and drains from a drain hole 482 formed at an appropriate position in the heat-insulating cover 36 to form a chamber of the inner rail 10. It falls on the inner sash lower inner frame 8. Then, the water that has fallen on the sash lower inner frame 8 is drained from a drain hole 481 formed at an appropriate position of the inner rail 10 by the cover body 51 provided between the outer rail 32 and the inner rail 10 on the indoor side. Sent down.

Further, since the water-stopping member 50 is provided between the outer rail 32 and the inner rail 10 at the fully joined position of the outer sash 11 and the inner sash 12 when the inner sash 12 is closed. The water accumulated between the outer rail 32 and the inner rail 10 is stopped by the water stopping member 50, especially since the water stopping member 50 is provided with many water stopping folds 47. It is prevented from penetrating into the room side under the part.

On the other hand, the water collected between the inner rail 10 and the outer rail 32 on the indoor side of the outer sash 11 when fully closed is substantially the same length as the outer sash 11 when fully closed. 32, 1
It flows down onto the cover body 51 inserted between 0,
The sash vertical frame 4 of the cover body 51 passes over the cover body 51.
A plurality of drain holes 43 provided at the near side and the intermediate portion are dropped on the upper surface 31 of the lower sash outer frame, and drain holes formed at appropriate places on the upper surface 31 through the upper surface 31 of the lower sash outer frame. Enter the inside of the hollow sash lower outer frame 30 from 42,
The water is drained outside through a drain hole 41 provided on the side surface of the hollow lower sash outer frame 30 via the upper surface of the lower surface 33 of the lower sash outer frame.

The drain hole 41 has a hinge 39.
Since the drain valve 40 is pivotally opened and closed by the
Although drainage from the inside of the hollow lower outer frame sash 30 is performed, it is possible to prevent rainwater due to wind pressure from flowing backward or blowing into the room through the hollow portion of the lower sash outer frame 30.

The cover body provided with the drainage hole of the present invention is fitted between the outer rail and the inner rail on the indoor side where the outer sash is provided when the sash is completely closed. Although the cover type has been described, the cover body may be fitted between the outer rail and the inner rail on the outdoor side of the inner sash in the fully closed state. When the cover body fitted between the outer rail and the inner rail on the outdoor side of the inner sliding door when fully closed becomes dirty, the cover body can be removed and the dirt can be easily washed with water.

In the sash lower frame of the present invention, the type in which the sash lower outer frame 30 and the sash lower inner frame 8 are connected by the bridge member 17 has been described, but the sash lower outer frame 30 and the sash inner frame 8 are not necessarily required. The type is not limited to the one separated from the above, and may be a type in which the inner and outer lower frame bodies are integrally sashed. The same applies to the upper sash frame and the vertical sash frame. In addition, each sash is a bridge material 1
In the case of the type connected by 7, it is possible to prevent dew condensation due to cold air of the outside air without necessarily having to provide an insulating cover on the indoor side of each sash inner frame.

[0035]

As described above, in the sash lower frame of the present invention, the inner and outer rails are provided on the upper surface of the sash lower frame having a hollow interior and a substantially flat upper surface, and the end of the outer rail is provided at the end of the outer rail. A notch for drainage and cleaning is provided, and the airtight material provided on the extension of the lower frame of the outer sash supported by the outer rail is slid below the notch of the outer rail to make sliding contact with the inner and outer sashes. A cover body provided with a water-stopping member between the inner and outer rails below the joining portion, and provided with a drain hole at an end portion and an intermediate portion between the inner and outer rails on the indoor side with a shoji when fully closed. A drain hole with a drain valve is provided on the outer surface of the hollow sash lower frame, and water collected on the cover body is drained from the drain hole of the cover body through the hollow portion of the sash lower frame to form a hollow sash lower frame. Water is drained from the drain hole with a drain valve on the outer side, so that water collects between the inner and outer rails. Without draining holes in the outer rails, it is possible to drain the water accumulated inside the sash lower frame indoors without impairing the watertightness and insulation performance. This has the effect that dust and the like accumulated in the frame can be easily swept out.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a portion where a sash lower frame and an inner sash are present according to the present invention;

FIG. 2 is a longitudinal sectional view of a portion where a drain valve of the present invention is provided and a portion where a sash lower frame and a sash are present;

FIG. 3 is a schematic plan view of a sash lower frame of the present invention;

FIG. 4 is a longitudinal sectional view taken along the line II in FIG. 3;

FIG. 5 is a longitudinal sectional view taken along a roll line in FIG. 3;

FIG. 6 is a vertical sectional view taken along the line C-A of FIG. 3;

FIG. 7 is a longitudinal sectional view of a conventional sash.

[Explanation of symbols]

1 Upper sash frame, 2 Lower sash frame, 3 Upper surface of the lower sash frame, 4 Upper sash outer frame, 5 Upper sash frame, 6
Guide member, 7 sash lower outer frame, 8 sash lower inner frame, 9 outer rail, 10 inner rail, 11 outer sash,
12 inner shoji, 13 outer shoji upper frame, 14 inner shoji upper frame, 15 outer shoji lower frame, 16 inner shoji lower frame, 17
Bridge material, 18 sealing material, 19 glass, 2
0 Extending part of the lower door frame, 21 airtight material, 22 sliding surface of lower frame sash seal, 23 door roller, 24 screen door rail, 25 screen door roller, 26 screen door, 27 spacer, 29 sash lower frame, 30 sash lower outer frame ,
31 Upper surface of lower frame of sash, 32 outer rail, 33
The lower surface of the outer frame under the sash, 34 heat-insulating cover, 35 heat-insulating cover, 36 heat-insulating cover, 37 heat-insulating cover,
38 screw, 39 hinge, 40 drain valve, 41
Drain hole, 42 drain hole, 43 drain hole, 45
Sash vertical frame, 46 stopper member, 47 water stop fold, 48 notch for drainage and cleaning, 481 drainage hole, 482 drainage hole, 49 drainage hole, 50
Water stopping member, 51 cover body, 54 skeleton opening, 55
Opening lower frame material, 56 screws, 57 cover body.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E011 MA02 2E036 TA05 TA06 TA07 TB01

Claims (1)

[Claims] 1. A sash frame provided on the inner surface on four sides of an opening of a building, wherein the lower sash frame has a hollow interior, a substantially flat upper surface, an outer rail and an inner rail, and an end of the outer rail. The airtight material provided on the extension of the lower frame of the outer sash supported by the outer rail slides below the notch of the outer rail, and the inner and outer sashes are provided. A water-stop member is provided between the inner and outer rails below the summing part,
A cover body provided with a drain portion is provided between the outer rail and the inner rail in a certain range of the outer sliding door when fully closed, and a drain hole with a drain valve is provided on an outer surface of a hollow sash lower frame; A sash lower frame, wherein water accumulated on the body is drained from a drain portion of the cover body through a hollow portion of the sash lower frame through a drain hole with a drain valve.