FR2521274A1 - Electrically operated door lock for domestic oven - uses an electric motor with associated reduction gearbox to rotate catch clear of locking hook fixed to door - Google Patents

Abstract

The lock comprises an electric motor which controls a locking mechanism, and is suitable for oven doors which are pivoted about either horizontal or vertical axes. The motor unit is mounted above a locking hook, inside oven, and is directly linked to the locking catch which mates with the hook to lock the door. The motor unit comprises a rotating output shaft from a gearbox unit driven by an electric motor. The output shaft is fitted with a bolt, the extremity of which is shaped as a cam which forms the catch engaging in the locking hook. The opening of the door is obtained by rotating the bolt and the cam through a half-turn, in response to activation of the lock by the user pressing a push button switch.

Description

 The present invention relates to a device for locking the door of a cooking oven.

 This device is of the type comprising a motor for controlling a locking hook, the oven door being articulated either around a horizontal axis or around a vertical axis.

 It is known to lock the door of an oven during cooking by means of a system comprising a motor mounted at the rear of the oven, and which controls the closing and opening of the locking hook by means a linkage linkage system.

 This system, commonly used both for doors hinged around a horizontal axis ("drop-down" door) or a vertical axis, is in practice relatively complicated and therefore expensive. In addition, the existence of several intermediate members between the locking hook and the motor can in the long run cause seizure of these intermediate members.

 The invention aims to remedy these drawbacks by proposing a considerably simplified locking device, therefore less expensive and which is also more reliable.

 According to the invention, the control motor is mounted above the locking hook, in the front part of the oven, and in direct control connection with the locking hook.

 Under these conditions, there is practically no longer any intermediate piece between the motor and the lock which cooperates with the hook, this lock being in fact directly mounted on the output shaft of the motor.

 Other features and advantages of the invention will appear during the description which follows, fate with reference to the attached drawing. on which there is shown a non-limiting embodiment of the invention.

Figure 1 is a mid-section view vertica) emi-elevation with
tear off, of a device for locking the
door of an oven according to the invention, the lock
being in the closed position of the door.

Figure 2 is a view similar to Figure 1 showing the
latch in hook release position
locking.

 The oven illustrated in FIGS. 1 and 2 is a cooking oven for domestic use, comprising a frame 1 surmounted by a cover 2 with the interposition of a ventilation duct 3 for ventilating the oven. Between this sheath 3 and the oven proper 4 is provided an insulation sheath 5, the oven 4 being equipped with a door 6 "drop", that is to say mounted pivotally about a horizontal axis.

 The above elements are known per se and will therefore not be described in detail.

 At its upper part, the door 6 is provided with a hook 7 arranged to allow the door to be locked during cooking.

 According to the invention, the door locking device 6 comprises a motor 8 mounted directly above the hook 7, in the front part of the cover 2, this motor 8 being in direct control connection with the hook 7.

The motor 8, known per se, is equipped with a switch 9, and with a rotary output camshaft 11, arranged vertically above the locking hook 7.

 The output shaft 11 therefore crosses the ventilation duct 3 and is provided with a lock 12 whose end 13 is shaped as a cam adapted to. engage in a corresponding slot 14 of the hook 7. The latter as well as the end cam 13 are placed in a housing 15 reserved between the door 6 and the insulating sheath 5.

The motor 8 can be controlled by the user by means of a button not shown, connected to the motor 8 by electrical connections 16. The motor 8 is arranged so that its control triggers the rotation of its output shaft 11, and by Consequently the latch 12 and the cam 13 on a half-turn in one direction or the other. In the position illustrated in Figure 1, the cam 13 is engaged in the slot 14 of the hook 7, and thereby locks the door 6. The opening of the latter is ensured by an order given to the motor 8 which starts the rotation of latch 12 and of cam 13 in the direction indicated by the arrow
R, on a half turn, at the end of which the cam is in the position illustrated in FIG. 2, where it is completely extracted from the hook 7.

 Successive commands by the operator therefore trigger the rotation of the latch 12 and of the cam 13 in one direction or the other.

 The arrangement according to the invention has the advantage of considerably simplifying the control of the door locking with respect to the prior devices, in which as indicated above, the control motor was placed at the rear of the oven and connected to the locking hook by more or less complex linkage systems. As a result, the locking device is significantly less expensive and safer to operate.

 It will be noted that, to protect the motor 8 from the heat given off by the oven 4, the thickness of the insulating sheath 5 is increased compared to the usual sheaths.

The invention is not limited to the embodiment described and may include variant embodiments. So
it is obvious that the hook 7 and the locking cam
13 can be shaped in any other way equivalent to that shown in the drawing

Claims (2)

 1. Device for locking the door (6) of a cooking oven, comprising a motor (8) for controlling a locking member, the door (6) being articulated about a horizontal or vertical axis, characterized in that the motor (8) is mounted above the locking hook (7) in the front part of the oven, and is in direct control connection with the locking hook (7).  2. Device according to claim 1, characterized in that the motor (8) comprises a rotary output shaft (11) provided with a latch (12) whose end is shaped as a cam (13) capable of engaging in the locking hook (7), the opening of the door (6) being obtained by rotation of the lock (12) and of the cam (13) on a half-turn.