JPS6317147A - Snow melting device for window panel - Google Patents

Abstract

PURPOSE:To permit the rapid melting of snow even if the outside air temperature is extremely low by allowing the engine cooling water to circulate in a pipe installed onto the back surface of the molding of window panel such as a front window glass and allowing the molding to be heated even by an electrical heating wire. CONSTITUTION:A plurality of pipes 3 are extended in the car width direction onto the back surface of a molding 2 which is made of metal or synthetic resin and covers the lower edge of a front window glass 1 of a car. The pipe 3 is connected with a radiator 6 through a connecting pipe 4 and a heater control valve 5, and the molding 2 is heated by the circulation of the engine cooling water having high temperature in the pipe 3. A plurality of electrical heating wires 7 are laid along the upper edge in contact with the glass 1 onto the back surface of the molding. The electrical heating wire 7 is controlled so as to conduct when the outside air temperature detected by a temperature sensor 10 becomes below a prescribed value (about -20 deg.C), and the adhesion of snow from the upper side edge of the moling 2 under the extremely low temperature condition can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a snow melting device for a vehicle window panel, such as a front window glass.

B. Prior Art Snowflakes that adhere to the windshield of a vehicle traveling during snowfall are removed to the end of the wiper's sliding stroke by sliding the wiper on the windshield surface. Therefore, each time the wiper reciprocates through its sliding stroke, it accumulates at the end of the wiper's sliding stroke.

Particularly, such a phenomenon appears conspicuously near the lower side of the windshield, and the snowflakes that adhere to and accumulate on the lower side of the windshield gradually become lumps, narrowing the operating range of the wiper.

In order to solve this problem, conventional windshield windshield systems have installed pipes for circulating engine cooling water behind the moldings, and the hot water inside the pipes warms the moldings to melt the snow that has accumulated on the lower side of the windshield glass. A glass snow melting device has been proposed (Utility Model Publication No. 59-192448)
issue).

Problems to be Solved by the C0 Invention However, in the case of such a conventional snow melting device for windshield windshields, there are problems that have already been described in Utility Model Application No. 60-16652 (Snow Melting Device for Concealed Automotive Wipers). As shown in the figure, the temperature distribution in the molding made by Kanai is uneven. For example, the temperature of the upper edge of the metal molding that is in contact with the lower edge of the front window glass is difficult to rise even with hot water in the pipe. Furthermore, when the outside air temperature falls below 120° C., the engine cooling water temperature does not become very high, so the non-uniformity of the temperature distribution becomes even more pronounced. For this reason, even in the above-mentioned conventional one.

Sometimes snow starts to accumulate from the upper edge of the metal molding,
As the attachment area gradually expands.

This did not completely eliminate the above-mentioned inconvenience.

This invention was proposed to solve these problems, and its purpose is to make it possible to equalize the temperature distribution of the molding even when the outside temperature drops extremely in cold regions etc. To provide a snow melting device for a window panel that can prevent snow from adhering to the side edges.

Means for Solving Problem D1 In the present invention, a heating wire is provided on the upper edge of the back side of the molding made of metal or plastic, and a temperature sensor for detecting the outside temperature is installed at a predetermined location. ,
An operation control means is provided which compares the detection signal of the temperature sensor with a set value and operates the heating wire if it is less than the set value.

E0 action When the outside temperature drops to, for example, -20°C or lower, the heating wire is automatically activated by the output of the activation control means.

The upper side edge of the molding is heated, thereby making the molding temperature distribution uniform and preventing snow from adhering to the upper side edge of the molding.

F. Example The present invention will be described below based on illustrated embodiments.

As shown in FIG. 1, a plurality of pipes 3 extend in the width direction of the vehicle on the back side of a molding 2 made of metal or plastic that covers the lower edge of a front window glass 1 of a vehicle. This pipe 3 is connected to a radiator 6 via a connecting pipe 4 and a heater control valve 5, and by opening the heater control valve 5, high temperature engine cooling water is circulated within the pipe 3.

Further, on the back surface of the molding 2, a plurality of heating wires 7 are pasted along the upper edge in contact with the front window glass 1. A temperature sensor 10 for detecting the outside temperature near the mall 2 is provided on the rear end of the vehicle body panel facing the wiper storage section 8, for example, the hood panel 9. 7 is energized.

That is, as shown in FIG. 2, one end of the heating wire 7 is connected to the battery power source 11, and the other end is connected to the relay switch 1.
It is grounded via 2. The relay switch 12 has an excitation coil 14 excited by the output of the comparator 13.
On/off control is performed by

A set value signal VR corresponding to the set outside temperature and a detection signal from the temperature sensor 10 are input to the comparator 13, and when the detection signal is below the set value, the excitation coil 14 is excited and the relay switch 12 is closed. to be accomplished.

Here, the comparator 13, the excitation coil 14, and the relay switch 12 constitute an operation control means.

In the snow melting device configured in this manner, for example, when the cooling water temperature is above a predetermined value, the heater control valve 5 is opened and hot water circulates within the pipe 3, thereby warming the molding 2 and melting the accumulated snow. Furthermore, the outside temperature is 120
℃ or below, the temperature of the molding 2 becomes uneven as the cooling water temperature decreases, but in this case, the output of the comparator 13 becomes high level, the excitation coil 14 is excited, and the relay switch 12 is closed. As a result, the heating wire 7 is energized, the molding 2 is heated, and the temperature is made uniform over the entire area. Therefore, even under extremely low temperatures, snow is prevented from adhering to the upper edge of the molding 2.

In addition, although the example in which the heating wire 7 is pasted on the back surface of the molding 2 is shown above, the molding 2 is not limited to this, and the molding 2 can be connected to a cable type heater (auto or It may also be formed by tracing). This cable type heater.

It consists of two parallel conductors connected by a conductive resin with a positive temperature coefficient of resistance, and has a self-control function that maintains a constant temperature over the entire length of the cable by applying a constant voltage between the two conductors. be. Moreover, this cable type heater has sufficient weather resistance.

Further, in the above-described embodiments, the case of a front window glass was explained, but it goes without saying that the present invention may also be applied to a rear window glass and a side window glass.

G0 Effect of the Invention According to this invention, engine cooling water is circulated through a pipe provided on the back side of the molding of a window panel such as a front window glass to warm the molding, and a temperature sensor detects the outside air temperature to maintain a predetermined temperature. In the following cases, the molding is also heated by heating wires, so even if the outside temperature drops extremely, the temperature distribution of the molding can be made uniform, and snow can be prevented from starting to accumulate from the upper edge of the molding. Therefore, smooth operation of the wiper can be guaranteed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a snow melting device according to the present invention, and FIG. 2 is a block diagram showing an example of its electric circuit. 1: Front window glass 2: Molding 3: Pipe 7: Heating wire 10: Temperature sensor 13: Comparator

Claims (1)

[Scope of Claims] A snow melting device for a window panel in which a pipe is provided along the back surface of a molding that covers the lower edge of a vehicle window panel, and engine cooling water is circulated through the pipe to heat the molding, comprising: It is characterized by comprising a heating wire provided on the back side of the molding, a temperature sensor that detects the outside temperature, and an operation control means that activates the heating wire when the detection signal of the temperature sensor is below a set value. Window panel snow melting device.