JP2645926B2 - Electric heating door - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heating door formed by forming a thin film made of an optically transparent conductive coating material on a glass surface.

[0002]

2. Description of the Related Art Conventionally, in a refrigerator or a refrigerated showcase in a supermarket or a convenience store, the inside of a refrigerator is cooled to a refrigerated or frozen temperature lower than a normal temperature in order to cool and store food. Further, the door of such a showcase is usually made of transparent glass in order to make it easy to see the food inside. Since this glass is cooled by cold air in the refrigerator, dew and frost adhere to the surface.

[0003] These dew and frost impede the visibility inside the showcase.
As shown in the publication, a thin film made of an optically transparent conductive coating material is applied to one surface of glass, and the thin film is energized to generate heat. And to ensure the visibility of the inside.

[0004]

However, the conventional structure disclosed in the above publication has the following problems.
That is, in the above publication, a thin film is uniformly applied to a glass surface, and band-like electrodes for supplying electricity to the thin film are formed vertically on both sides of the glass, and a power supply line for supplying power to the electrodes is provided on the door. Pulled down from both sides.

However, since this power supply line is connected to the electric wire from the showcase main body which is usually introduced from the upper hinge, the power supply line drawn from the lower end of the door on the pivot side of the door has the upper and lower sides of the door. For the power supply line drawn from the lower end on the non-pivot side of the door, the inside of the sash of the door must be routed around almost half the circumference and brought to the hinge part, which makes wiring work extremely troublesome. At the same time, there was a high risk of disconnection along the way.

[0006] The present invention solves the problem of the conventional structure,
An object of the present invention is to provide a highly safe electric heating door that facilitates wiring work of a power supply line to a thin film formed on glass of a door.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an electric heating door 7 in which a thin film made of an optically transparent conductive film material is formed on one surface (back surface) of a glass plate (outer glass 12C). The first and second electrodes 36, 3 having substantially the same length in the vertical direction with an interval 34 on the back side of the door 7 pivot side.
7, a common electrode 39 is formed on the back surface of the outer glass 12 </ b> C on the non-pivot side of the door 7, and feed lines 40, 41 respectively drawn from the first and second electrodes 36, 37 are provided. Are separated from each other in the first and second thin films 31 and 32
The first thin film 31 is connected between the first electrode 36 and the common electrode 39, and the second thin film 32 is connected to the second electrode 37.
And the common electrodes 39, and feed lines 40 and 41 are drawn from portions of the first and second electrodes 36 and 37 that are close to the gap 34, respectively.

[0008]

According to the present invention, the power supply line 40 and the first electrode 36 are provided.
A series circuit of a first thin film 31, a common electrode 39, a second thin film 32, a second electrode 37, and a power supply line 41 is formed.
1 and 32 are energized to generate heat and eliminate dew and frost from adhering to the outer glass 12C.

At this time, since the first and second electrodes 36, 37 are on the side of the outer glass 12C pivotally supporting the door 7, the power supply lines 40, 37 are provided.
Both 41 can be pulled out directly from the electrodes 36 and 37 on the pivot side of the door 7.

[0010]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a refrigerated showcase 1 to which the present invention is applied.
2, FIG. 2 is a partially cutaway perspective view of the door device 2, FIG. 3 is a front view of the outer glass 12C, FIG. 4 is a plan sectional view of the three-layer glass 13 on the pivoting side of the door 7, and FIG. Door device 2 of device 8 part
Are respectively shown in perspective perspective views.

The refrigerated showcase 1 has a storage room 5 inside a heat-insulating box 4 which is opened forward.
A cool air is supplied from a refrigerating device (not shown) to the inside, and is maintained at a predetermined low temperature. The door device 2 basically includes a frame-shaped aluminum frame 6 attached to the opening edge of the heat-insulating box 4, and two electric appliances pivotally supported by the frame 6 on one side in the vertical direction. It comprises a heating door 7. In FIG. 2, both doors 7 are pivotally supported by an upper hinge device 8 and a lower hinge device 9, respectively, in a so-called double-opening manner. , And the opening direction can be changed by inverting the door 7 up and down.

The door 7 has a sash 11 formed by extrusion of aluminum and a three-layer glass 13 composed of an inner glass 12A, a middle glass 12B and an outer glass 12C.
And a glass packing 14 made of a soft resin, an L-shaped corner reinforcing bracket 15 made of zinc die-cast and inserted at four corners of the door 7, and a handle 16. The door 7 is vertically symmetrical so that it can be used in an inverted manner as described above.

The three sheets of glass 12A, 12B, 12C constituting the three-layer glass 13 of the door 7 are connected to each other with a space therebetween by spacers 30, 30.
As shown in FIG. 3, a first thin film 31 and a second thin film 32 are formed on the rear surface, which is one surface of C, so as to cover substantially the entire rear surface of the outer glass 12C as shown in FIG. ). Both thin films 31 and 32 are made of an optically transparent conductive coating material, and the outer glass 12C is formed by coating the material or by bonding a film-like material.
Are formed horizontally with an insulation interval 34 of, for example, 5 mm horizontally at the upper and lower centers.

A first electrode 36 and a second electrode 37 made of a silver material are provided on the edges of the thin films 31 and 32 on the side of the door 7 pivotally supported.
Are formed above and below, respectively, the first electrode 36 is formed only with the first thin film 31, and the second electrode 37 is formed with the second thin film 32.
Is electrically connected only to On the other hand, both thin films 31 and 32
On the non-pivot side edge of the door 7, a common electrode 39 also made of silver material is formed on the upper and lower sides, and both thin films 31 and 32 are electrically connected to the common electrode 39, and only at this common electrode 39 Both thin films 31 and 32 are conducted.

A power supply line 40 is welded to the end of the first electrode 36 on the space 34 side, as shown in FIG. 4, and a power supply line 41 is also provided on the end of the second electrode 37 on the space 34 side. The both power supply lines 40 and 41 are welded and pulled out laterally from the center of the three-layer glass 13 on the side of the door 7 pivotally supported. Further, by this, the power supply line 40-the first electrode 36-the first thin film 3
1-common electrode 39-second thin film 32-second electrode 37-
A series circuit through which the current flows with the power supply line 41 is configured.

Referring to FIG. 5, the upper hinge device 8 comprises an upper hinge 50 and a receiving member 51.
A plurality of lead wires 53 for supplying power to the heater 52 inside the sash 11 and the first and second thin films 31 and 32 are movably inserted into the zero. In this state, the upper hinge 50 has a straight pipe portion inserted into the inside of the sash 11 through a not-shown notch formed in the upper corner portion of the sash 11 earlier than the lead wire 53, and is formed on the vertical side of the corner reinforcing bracket 15. It is rotatably and removably inserted into the groove 28.
Lead wire 53 pulled out from the lower end opening of upper hinge 50
Is inserted up to the center of the door 7, and the heater 52 and the first and second electrodes 3 are inserted at the center of the sash 11 on the side of the door 7 pivotally supported.
The feeder lines 40 and 41 respectively drawn out from the connectors 6 and 37 are connected to the coupler 55. The coupler 55 is fixed to the inner surface of the cover 10 made of synthetic resin as shown in FIG. 5, and in this state, the cover 10 is detachably engaged with a window hole on the side surface of the sash 11 (not shown) and attached.

As described above, the power supply lines 40 and 41 are connected to both electrodes 3.
Since it can be pulled out directly from 6 and 37 to the pivot side of the door 7 and connected to the lead wire 53, it is not necessary to route the inside of the door 7 as in the conventional case. In addition, the power supply lines 40 and 41
Is pulled out from the center of one side of the door 7 and the lead 5
3, the door 7 is vertically symmetrical in electrical wiring, and no problem occurs when the door 7 is used in an inverted manner as described above.

After the upper hinge 50 is attached to the electric heating door 7 and the lower end of the door 7 is pivotally supported on the frame 6 by the lower hinge device 9, the upper end of the upper hinge 50 is inserted and fixed to the receiving member 51 from the front. The upper end is pivotally supported on the frame 6. Upper hinge 5
The end of the lead wire 53 pulled out from the upper end opening of the
After being pulled out rearward from the receiving tool 51, it is connected to the lead wire 57 drawn out from the heat insulating box 4 side by couplers 58 and 59.

In the above configuration, the lead wires 57 and 5
When a voltage is applied between the power supply lines 40, 41 and the two electrodes 36, 37 via the third electrode 3, the current flows from the first electrode 36 to the first thin film 31, then to the common electrode 39, and to the common electrode 39. From the electrode 39, it further flows to the second thin film 32, and subsequently flows to the second electrode 37. As a result, both the thin films 31 and 32 generate heat, and the outer glass 12C is heated from the back surface to prevent dew or frost from adhering.

The space 34 between the outer glasses 12C has no thin film and is a non-heated area, but is extremely narrow.
Since the upper and lower thin films 31 and 32 generate heat, there is no practical problem. Also, depending on the color of the thin film used, the color of the glass at the interval 34 part is slightly different from the upper and lower,
Even if it is a slight difference, even if it becomes a problem, by providing a shelf horizontally in the storage room 5 located just behind,
Discomfort can be eliminated.

In the embodiment, the three-layer glass is applied to the present invention. However, the present invention is not limited to this, and a two-layer or more multilayer glass may be used. In the embodiment, since the door 7 needs to be inverted, the two thin films 31 and 32 are provided at the center of the door 7.
However, the present invention is not limited thereto, and the separation position can be changed without departing from the gist of the present invention. Further, the electric heating door of the present invention is effective not only in a refrigerated showcase but also in a frozen showcase and the like. .

[0022]

According to the present invention, the first and second electrodes are located on the pivotal side of the glass door, and the power supply line can be drawn directly from both electrodes to the pivotal side of the door. There is no need to route the power supply line around, and the wiring work becomes extremely easy, and the occurrence of disconnection failure in the middle can be reduced.

In addition, when the length of the first and second electrodes is made substantially equal, and the power supply line is drawn out from a portion near the interval between the first and second electrodes, the door can be used in an inverted state. There is no need to change the length of the power supply line, and the wiring work becomes extremely easy. As a result, it is possible to provide an electric heating door that can easily cope with inverted use of the door.

[Brief description of the drawings]

FIG. 1 is a perspective view of a refrigerated showcase.

FIG. 2 is a partially cutaway perspective view of the door device.

FIG. 3 is a front view of the outer glass.

FIG. 4 is a plan sectional view of a three-layer glass.

FIG. 5 is a transparent perspective view of a door device of an upper hinge device portion.

[Explanation of symbols]

 2 Door device 6 Frame 7 Electric heating door 8 Upper hinge device 9 Lower hinge device 12C Outer glass 13 Three-layer glass 31 First thin film 32 Second thin film 34 Interval 36 First electrode 37 Second electrode 39 Common electrode 40 Power supply line 41 Power supply line 53 Lead wire

Claims (1)

(57) [Claims] 1. An electric heating door in which a thin film made of an optically transparent conductive film material is formed on one surface of a glass plate,
The surface of the glass at the door pivot side is spaced apart from the one surface.
First and second electrodes having substantially equal lengths formed on the upper and lower sides ;
A first electrode formed on the one surface of the glass on the non-pivot side of the door, and a feed line extending from each of the first and second electrodes; And a second thin film, wherein the first thin film is connected between the first electrode and the common electrode, and the second thin film is connected between the second electrode and the common electrode. An electric heating door, wherein the power supply line is drawn from a portion near the interval between the first and second electrodes.