JPS58156126A - Door locking device for heater - Google Patents

Abstract

PURPOSE:To simplify and miniaturize the structure of a door locking device, by turning an electric switch on, when a door-key is completely engaged with a detent, as well as to engage the detent which is interlocked with an electromagnetic armature with the door-key at the time when the door is closed. CONSTITUTION:When a door 10 is closed, a door-key 11 pushes to move a lever 13. In case that the door 10 is not completely closed, an electric switch 33 is not operated, because the guide projection 29 of an armature 21 hits the projection 13' of a lever 13, and a detent 20 cannot reach to a locking position. Accordingly, safetyis assured in the titled device. On the other hand, when the door 10 is completely closed, the lever 13 is completely rocked and the guide projection 29 can engage with the slot 13'' of a lever 13. Then the detent 20 engages with the door-key 11 to operate the electric switch 33, and heating is started. During heating, the door is prevented from opening, because the detent 20 is held in the engaged position with the door-key 11. When heating is finished, a coil 24 is energized to move the armature 21 to the right to cut the electric switch 33 off, so that the door can be opened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a locking device for a door of a heating device.

Conventional Structures and Problems In conventional heating chambers, such as gas-open or microwave ovens, it is necessary to automatically lock the heating door. For this purpose, the detent is engaged with the door lock,
The detent is then moved into the locking position by means of an electromagnet which is energized by a thermostat or a door switch. In the known embodiments, a large lever drive was used to transmit the displacement movement.

OBJECTS OF THE INVENTION The present invention overcomes the above-mentioned drawbacks of the prior art and aims to provide a simple, inexpensive and particularly compact door locking device.

Structure of the Invention In order to achieve the above object, the door locking device for a heating device of the present invention includes a heating chamber, a door that opens and closes a front opening of the heating chamber, and a door locking device that is provided on the door and that locks a switch when the door is closed. at least one electromagnet, a detent interlocked with an armature of the electromagnet, and an electrical switch operated by the armature of the electromagnet, the door lock being operable when the door is closed. The electric switch is configured to engage a detent interlocked with the armature, and the electric switch is turned off when the engagement is incomplete and turned on when the engagement is complete.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a heating chamber 4 with a heating chamber wall 1, which is surrounded by a heat insulating layer 2 and a door 3, which is formed, for example, as a revolving door or a so-called pull-out door. There is. A grill heat radiator 6 is provided on the ceiling side in a heating chamber 4 surrounded by a heating chamber wall 1. The heating chamber wall 1 is surrounded by a frame 6, and in the space 7 between the outer case and the insulation layer 2 there is a ventilation passage 8 with a ventilation shutter 9 and the control and regulating devices described above and described in detail below. A locking device is provided. A door handle 10 is formed on the upper part of the door 3, and a door lock 11 is protruded and fixed inside the door handle 10. As shown in FIG. 3, the door lock 11 has a bar groove 12. A lever 13 operatively connected to a door lock 11 is mounted on the heating chamber wall 1 or on a frame around it so as to be able to swing about an axis 14.

The lower lever leg 16 protrudes to the vicinity of the door lock 11. A door 3 to which an adjustment lever 17 for a microswitch 19 and an operating protrusion 18 are fixed to the other lever leg 16.
To close the door, the front end of the door key 11 pushes the lever 13 in the direction of the arrow, and at the same time the microswitch 19 is operated. In the heating chamber 4 described above, it is important to have a device equipped with a high frequency generator and adapted to heating by high frequency. In this case, a micro switch 1 is installed in the operating circuit of the high frequency generator.
9 is placed, and only then, by a precise and complete closing of the door 3 via the microswitch 19, the operating circuit can be closed and the device can be put into operation by means of high-frequency oscillation.

In FIG. 2, a substantial portion of the heating chamber 4 which is necessary for understanding is shown again. A detent 20 is provided on the side of the lever 13, which is firmly connected to the armature 21 of the electromagnet 22 and swingably engages with the lock groove 12 of the door lock 11.

In FIG. 3 the locking device is shown alone. Electromagnet 22
has two coaxial magnetic coils 23 and 24, constructed as so-called reversible magnets, with an electrical joint 26 common to the two coils and two joints 26 and 27 provided for the coils 23 and 24 individually. The detent 2o is substantially L
It has a letter-shaped shape and rests on a fixed seat on the coaxial protrusion 28 of the armature 21. The armature 21 forms a guide protrusion 29 with a rounded end and a narrower end. Further, the armature 21 has an operating projection 3o having a curved sector 31 formed at the other end. This actuating projection 3° with its curved sector 31 cooperates functionally with the actuating element 32 of the electric switch 33 and can be used, for example, in the coil 23 of the electromagnet 22 in the locking device (FIG. 3).
O13 is a swingable lever which acts to push the operating element 32 upwardly by the curved sector 31 and turn on the switch operation of the switch 33 according to the excitation of the armature 21 and the corresponding movement of the armature 21. Powered by 10 complete closures.

The lever 13 has a side protrusion 13' in which a groove 13'' is provided. When the door 1o is completely closed, the groove 1
3# is perfectly aligned with the axis of the armature 21 to engage the guide protrusion 29 of the armature 21 in the groove.

When the door 1o is not in the completely closed position, the guide protrusion 29
protrudes into the projection 13' and the detent 2o does not reach the locking position shown in FIG. Due to this incomplete movement of the armature 21, the electric switch 33 is not operated and operates on the safe side. The electrical switch 33 thus senses whether the armature 21 has fully entered the locking position or whether a locking operation has been performed.

During heating of the heating chamber 4, the detent 20 remains in the locking position shown and prevents the door 3 from opening. Next, for example, when the timer returns to 0, the magnetic carp A/i! 4 is energized and the armature 21 returns to the stop position, which is to the right in the figure, the electric switch 33 is turned off and heating is stopped. At the same time, the lock #3 is released and the door 3 can be opened.

The locking device has screws 3 as an integrated component unit.
4 is fixed to the casting part of the ventilation passage 8 in this embodiment.

In the above embodiment, when heating the heating chamber 4 with high frequency, it is desirable that the lever 13 pivotally supported in the heating chamber 4 operate an electrical safety switch in the operating circuit of the high frequency oscillator.

Further, in the case of a heater having only an electric heater, the microswitch 19 can be omitted. in this case,
The lever 13 functions only as a sensor for detecting the exact position of the guide protrusion 29 of the armature 21.

In this way, the plunger type armature 21 and the detent 20
It is possible to reduce costs and make it more compact by maintaining the same.

In addition, a lever 13 supported swingably in the heating chamber 4 is provided,
An electric switch that starts heating by rotating this lever 13 with the door lock 11 of the closed door 3 and fitting the guide protrusion 29 of the plunger type armature 21 only in the correct door closing position. It is highly safe because it turns on.

Effect of the invention As described above, according to the present invention, the following effects are obtained.

1. Since the heating means can be energized only when the door is fully closed, safety is high, especially for heaters that use high-frequency radio waves. Furthermore, since the heating means is stopped when the door can be opened, safety is also high.

2. The locking device itself is compact because the armature of the electromagnet is equipped with a means for detecting the exact position of the door and a means for engaging the door key.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part of a door locking device for a heating device which is an embodiment of the present invention, Fig. 2 is a cross-sectional view of a main part of Fig. 1, and Fig. 3 is an enlarged plan view of the main part. . 1... Heating chamber wall, 3... Door, 4...
... Heating chamber, 1° ... Door handle, 11 ...
...Door key, 12...Kannu'! ! Groove, 1
3... Lever, 1e... Micro switch, 20... Detent, 21... Armature, 22... Electromagnet, 29 ...Guide protrusion, 3o...Operation protrusion, 33...
・Electric switch.

Claims (1)

[Scope of Claims] (1) A heating chamber, a door that opens and closes a front opening of the heating chamber, a door key provided on the door and that operates a switch when the door is closed, and at least one electromagnet; a detent interlocking with the armature of the electromagnet; and an electric switch operated by the armature of the electromagnet, the door lock engaging the detent interlocking with the armature when the door is closed. 9. A door locking device for a heating device, wherein the electric switch is turned off when the locking is incomplete and turned on when the locking is complete. @) A swingable lever is provided, which lever can be moved to the operating position by the door lock of the closed door and has a groove in which a part of the armature can be exclusively engaged in the correct door closing position. A door locking device for a heating device according to claim 1. (3) A configuration in which an operating element of an electric switch is provided that cooperates with an armature having a curved protrusion, as claimed in claim 1.
A locking device for a heating device according to paragraph 82. (4) A door locking device for a heating device according to claim 1, wherein the electromagnet is a reversible magnet capable of fixing the armature at both end positions.