JPS6062381A - Heatable door cylinder of car door - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heatable door cylinder, in particular for a motor vehicle door, having an electric heating device and a switch provided for operating the electric heating device.

BACKGROUND OF THE INVENTION Various proposals have already been made for electrically heating motor vehicle door cylinders, but these proposals generally have significant drawbacks.

Therefore, a heating cartridge with an ohmic resistor is used as a heat dissipation element, and this heating cartridge is fitted into a recess in the cylinder housing. However, heating cartridges of this type are necessarily large in size and therefore require a large portion of the limited available space (with sufficient power) in this region.
Manufacturing suitably small heating cartridges is difficult and expensive.

In addition, iron heating wires are already used as heat dissipation components, in which case the heating wires are wound around the cylinder housing. This makes lock assembly particularly difficult and expensive.

Finally, PTC resistors are also already used, but P
The required location of the TC resistor is too large for the required heating power, with attention to the required fatigue limits.Objective of the Invention Recognizing this prior art, it is an object of the present invention to 5. The door cylinder as mentioned at the beginning can be constructed as follows: There are many things.

According to the invention, this object is achieved in that a transistor is provided as the heating element. This transistor is a commercially available power transistor, and a voltage drops at the PNP (NPN)φ junction of this power transistor, and this voltage heats the transistor. The heating power is sufficient to free the closed cylinder from freezing within a short time. A resistor is connected between the base and emitter of the transistor. The heating power of the transistor is obtained from the voltage across the emitter and collector and the current flowing through the emitter-collector section.

Embodiment According to a preferred embodiment, there is a heat-related resistor in the switching circuit, which resistor is preferably arranged in the immediate vicinity of the cylinder housing of the closed cylinder. The heating output can thereby be adapted to the respective temperature of the closed cylinder. The emitter-collector current is related to the current at which the base of the transistor is controlled. Since only a small current is required to control the base, the heating transistor can be optimally adapted to the requirements by means of the electronic components. Because the heat-related resistors are arranged in the immediate vicinity of the cylinder housing, a very direct temperature control 111 is achieved, which makes it possible to minimize energy losses.

Advantageously, the heating element is constructed as a plug-in component. For this purpose, it is advantageous that the cylinder housing has a groove cut into it, and a transistor can be inserted into this cllol. Preferably, the metal substrate fitted into the transistor protrudes beyond the transistor body on both sides. The protruding edge of the substrate is accommodated by the 1° angle of the cylinder housing. Since the substrate is thereby in direct contact with the cylinder housing, a good heat transfer over a large area is ensured.

The switch is preferably a contactless switch 2) which can be configured as a reed contact switch. The circuit can include a time relay, which allows the current l! ! The l tract can be held closed for a predetermined period of time. It is enough to do so.

Further advantages, details and features important to the invention of the invention will emerge from the following description of a preferred embodiment with reference to the accompanying drawings, in which: FIG.

The door handle is generally designated 10 in FIG. Handle piece 1 is approximately U-shaped. This handle piece is attached to the front end of the door side.
The rear end has a mounting piece I3 for permanently fixing the handle piece 11 to an automobile door (not shown).

A handle key 14 for operating a lockable cylinder 15 is held swingably around a swing bin 16.

As can be seen in particular from FIG. 2, the cylinder housing 22 has a groove 23 cut into it. A metal substrate 21 is fitted into the transistor 17, and this substrate protrudes from the transistor body on both sides. Since the transistor 170 substrate 21 is fitted 2:3 into the cylinder housing 220, a structural unit is obtained. Since the entire surface of the substrate 21 is in contact with the cylinder housing 22, the heating output of the transistor 17 can be applied to the closed cylinder with little loss.

FIG. 3 is a circuit diagram of the heating device. The voltage of the vehicle battery 25 is applied between the emitter and collector of the transistor I7. A resistor 18 is connected to the emitter and base of the transistor 17. Furthermore, there is a heat-related resistor 19 in the current circuit, which resistor is used to control the base current of the collector 17 as a function of temperature. 41'IV Regarding the structural configuration, a thermal resistor 19 is present in the immediate vicinity of the transistor 17 or the cylinder housing 22.

'A contactless switch 21 is provided to close the current circuit. In the illustrated embodiment it is a single contact switch which can be operated by an electromagnet 2+1.

The electromagnet 20 is present in the handle key 14 of the door handle 10. When the handle key 14 is operated, the electromagnet 20 approaches the switch 24, thereby opening the switching contacts. The extreme positions are shown in FIG. 1, and the switching position is indicated by a dashed line.

The operation of the door cylinder heating device will be explained below.

If the cylinder is frozen, the door lock cannot be unlocked. However, the lock operating device, ie the door handle key 14 of the door handle 10, is still swingable. But in this case the door doesn't listen. This is because it is still locked. Electromagnet 20 moves toward reed contact 24 to apply current. When the current circuit is closed, a base current flows. heating transistor 1
7 conducts and heats the cylinder housing 22 and the temperature-related resistor 18. The resistance value of the resistor 18 is changed so that the base current is small and the emitter-collector current is also correspondingly small.

The heating power of transistor 17 is reduced and the temperature is adjusted to the desired value depending on the resistance associated with the selected temperature. This value is, for example, 771□1 degree of approximately 60"C at the required heating power.

If the device is configured without a time relay, as shown, the heating device remains activated as long as the handle key 1/I of the door handle 10 is kept pressed. On the other hand, the device can include a time relay, so that it is necessary to press the handle key 14 once or twice in order to start a heating process that is maintained for a predetermined time depending on the connection time of the relay, which is a safety precaution. For some reason it is only necessary to operate twice within a given time.

The entire heating device includes only a few components that are completely integrated into one heating insert. The heating device can be left as a waterproof unit 2 or can be prefabricated, housed in a suitably sealed plastic housing and including a plug. A plug connection piece 28 is provided at the end of the connecting line 27 for connection to the electrical system of the motor vehicle.

It goes without saying that the invention can also be implemented without modification in other types of handles, for example pull handles or swing handles. In both cases the electromagnet of the switch or reed contact switch is attached directly to the movable opening mechanism.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of an automobile door handle, FIG. 2 is a sectional view of a cylinder housing equipped with a heating device according to the present invention, and FIG. 3 is a circuit diagram of a heating device according to the present invention. It is. 17...Transistor, 18.19...Resistor, 22
...Cylinder housing, 23...Groove, 2/l...
・Switch Patent Applicant: 6 Hoof” - Industrief Erwaldung Gesellschaft Mitsut Beschrenktel Hattrang+:;-, “r'-” Patent Attorney Patent Attorney Osamu Naka, S゛,! +1: 1.
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Claims (1)

[Claims] 1. A door, in particular for a motor vehicle, with an electric heating device and a switch provided for operating this electric heating device, characterized in that a transistor is provided as the heating element. 2. The door cylinder according to claim 1, characterized in that a resistor (18) is connected between the pace and the emitter of the transistor (17). 3. Opening and closing. Door cylinder according to claim 1 or 2, characterized in that a heat-related resistance (19) is present in the circuit. 4. The heat-related resistance (19) is a cylinder housing of a closed cylinder. (22): (m IF iF old door cylinder 5 heating element as plug-in component 4
A door cylinder according to any one of claims 1 to 4, characterized in that the door cylinder has a length L'7. 6 The cylinder housing (22) has a cut groove (
23), and a transistor (17) can be inserted into this groove.
The door cylinder according to any one of items 5 to 5. 7 Metal substrate (2) fitted into transistor (17)
7. The door cylinder according to claim 6, wherein the door cylinder 1) protrudes from the transistor body on both sides. 8. Claims εI'', characterized in that the switch (24) is a contactless switch: January 11 [(-) The door/lifter according to one of the items 7. 9. Switch (24) The door cylinder according to claim 698, characterized in that is a reed contact switch. 10. A time IJ V- exists in the current circuit, and this time relay causes the current circuit to close for a predetermined time θ) ptaj 10. The door cylinder according to claim 1, wherein the door cylinder is capable of being held in a closed state.