FR2633033A1 - DOOR LOCKING AND UNLOCKING DEVICE FOR PYROLYTIC CLEANING COOKING CHAMBER - Google Patents

Abstract

The invention relates to a device for locking and unlocking a door for a cooking chamber, in particular for a cooking chamber with pyrolytic cleaning, comprising a synchronous motor 7, a movable lock carrying a latch 6, a return spring 3, two microswitches. 1, 2, characterized in that it further comprises: - on the one hand a single support 20 carrying the motor 7 and the latch 5, and at least one lateral guide means of said latch 5 integral with the support 20, - d 'on the other hand a single transmission arm 4 secured by one of its ends to the axis of the motor 7, comprising at its other end a hooking means 4a for the return spring 3, a cam 4b provided to drive the latch 5 in translation. The invention is of particular interest to manufacturers of domestic pyrolysis cooking chambers.

Description

The invention relates to a device for locking and unlocking

  door for cooking chamber, in particular for

  a cooking chamber with pyrolytic cleaning.

  It is required by the regulations in force to equip pyrolysis cleaning ovens with a locking system.

  automatic unlocking of the door over a certain

  erated to prohibit the opening of the door during the

operation in pyrolysis.

  Different types of locking and unlocking are proposed.

  electromagnetically controlled latch devices as in FR 73 13 831 and FR 73 01 363; arm devices from

  motor-driven locks and controlled by microp-

  contacts like for example the one shown in Figure 1 and which

  is used by the applicant for its construction reference furnaces

800.

  This device consists of a motor (M), two micro-

  contacts (MC1) and (MC2), a lever (L), a lock (V), a res-

spell (R).

  As soon as the main oven control switch is set to the pyrolysis position, the motor (M) starts up and drives the lever (L) in rotation to release the latch (V) which is released by the action

  spring (R), goes down and locks the door.

  The bolt (V) downwards releases the micro-contact (MC1) allowing then the start of the heating for the cycle of

  cleaning, and in its rotation, the lever (L) presses on the micro-

  contact (MC2) thus stopping the motor supply.

  By setting the main switch to a position other than pyrolysis, the motor is energized again, but then rotates in the opposite direction. The lever (L), in its rotation: - raises the lock (V) which releases the door, - presses the micro-contact (MC1): the motor is no longer powered. But the motor can only be powered if the pyrolysis thermostat has switched, that is to say that the temperature in the chamber 2. is lower than the temperature required by the regulations in force. This device thus has two moving parts, the lever (L) and the lock (V), each of which controls a micro-contact, and requiring two non-integral guide means. The major disadvantages of the device are to require significant construction play, further amplified by the length of the lever (L), to act on the micro-contacts by two separate moving parts, and to operate the micro-contact (MC2) and the lock (V) by

  two separate arms of the lever (L) separating the two controls.

  These games are, in a number of cases, the cause of

  such as total door locking or unlocking

  rusting at the end of pyrolysis followed immediately by a new

  rusting. To overcome this drawback, a solution would be to add a control device to the current mechanical device.

electromagnetic relay.

  This solution would however be expensive.

  To overcome all the disadvantages of the prior art, the

  Applicant has preferred to completely modify the mechanical device.

  To achieve this goal, the plaintiff has imposed

  control the two micro-contacts via a single finger

  that integral with the lock, and to bring together all the guiding functions

  and positioning on a single support, to reduce gaming.

  All these conditions are fulfilled by the mode of

  preferred nonlimiting embodiment of the invention which is described below.

  after. According to the invention, the device for locking and unlocking a cooking chamber door comprises a synchronous motor, a movable latch carrying a latch, a return spring, two micro-contacts and is characterized in that it also comprises on the one hand a single support carrying the synchronous motor and the lock, and at least one lateral guide means of said latch secured to the support, on the other hand a single transmission arm secured by one of its ends to the axis of the motor synchronous and having at its other end a hooking means for the return spring, and a drive member of the lock adapted to produce a displacement

  rectilinear vertical lock for example a cam.

  Furthermore, the lock has a single finger designed to actuate in turn the tabs of two micro-contacts, placed in the same plane. In the case where the associated electrical circuit

  would require more than two micro-contacts, one can foresee if neces-

a plurality of fingers.

  The invention will be better understood from the description

  hereinafter with reference to the following appended figures:

  - Figure 1: overview of the locking device-

  unlocking the prior art.

  FIG. 2: Overview of a preferred embodiment

  non-limiting of the present invention.

  - Figure 3: side view of the device of Figure 2 in the mounting position on the frame of the cooking chamber with closed door.

  - - Figure 4: front view of Figure 3 with open door.

  The preferred non-limiting embodiment shown in the accompanying figures consists mainly of: - two microswitches (1, 2), a spring (3), - a transmission arm (4),

a movable latch (5),

  - a latch (6) secured to the latch (5), - a reduction motor (7), - a bar (8),

a support (20).

  The carrier (20) is designed both to support the assembly

  of all the elements constituting the locking-unlocking device

  rusting, and to perform all the guiding functions of

  all moving parts of the same device.

  The support (20) is formed of a sheet metal plate cut and folded. There is a central plate (26) carrying a vertical -35 stamped (28), said central plate is extended first part in 4. high by an upper leg (21) horizontal and a rim (22) vertical obtained by folding on the other hand, also in the upper part, with a lateral tab (27) vertical and perpendicular to the central plate (26) and, on the other hand, in the lower part, with a lower tab (24) vertical and perpendicular to the central plate (26), and a border (23) vertical parallel to the central plate (26), the tab (24) and the border (23) being obtained by folding, the tab (24) comprising a guide means latch (6), for example a light

  (25), vertical, rectangular, with guide chokes

  (32) adjusted to the thickness of the latch for example and not limited to

  two in number, arranged opposite one another.

  The main functions of the various parts of the support (20) which have just been listed are not limited: - fixing and positioning of the entire device on

  the frame of the cooking chamber by any appropriate means, for example

  as in the figures by screwing or riveting the edges (22),

  (23) on the uprights (9a), (9b) of the frame (9).

  - support micro-contacts (1) and (2) so that the opening and closing positions of the control tabs

  are in the same vertical plane parallel to the direction of movement.

lock.

  - motor support (7) which is fixed by any appropriate means (29) in the upper part of the central plate (26), preferably for

  because of congestion on the other side of said plate (26) by

arm (4) and lock (5) port.

  The support has other functions described below.

  Moreover, the lock is a flat metal rod sensi-

  L-shaped and having at its lower end a latch (6) guided vertically and laterally by the light (25) and the constrictions (32), at its upper end two fasteners (10a, lob) and

  a finger (11) lateral obtained by cutting and folding.

  In addition, the transmission arm (4) is integral at one end of the motor shaft (7) and has at its other end a hooking means (4a) for the spring (3), and in 5.

  the latch a cam (4b) adapted to transform the circular movement

  arm (4) in a rectilinear movement of the latch (5) (see

Figure 2).

  The spring is a standard spring hooked on the one hand in (4a), on the other hand to one or the other of the fasteners (10a, lob) of the lock (5) according to the chosen tension. We can possibly foresee

a higher number of fasteners.

  The support (20) is completed by a bar (8) providing with the central plate (26) of the support the lateral guides of the latch (5), respectively lateral guidance side enclosure, and lateral

outer side.

  For example the bar is secured to the support (20) by two bushes (30) blocked by screws (31) or by any other appropriate means. A set of bosses (33) for example four in the stamp (28) and four on the bar (8), to ensure a good sliding of the lock (5) (see Figure 4), and arranged in pairs facing each other. The bushes (30) constitute fixed points of the assembly (support (20), bar (8)) which cooperate with the oblong slots (13) provided in the lock (5) to allow its displacement. The lights (13) extend;

  parallel to the axis of movement of the lock (5) and their length.

  is suitable for the amplitude of the sliding of said lock.

  The device works as follows:

  As soon as the control switch of the loudspeaker, not shown

  sent, is put on pyrolysis position, the motor (7) starts and drives the arm (4), and under the action of the spring the latch (5) goes down as shown in dashed lines in Figure 3. The latch (6) moves down and locks the door, then the finger (11) presses on the tab of the microswitch (2) which cuts off the power supply

the engine (7).

  Simultaneously, the tab of the micro-contact (1) has been released.

  and the cleaning cycle begins.

  By placing the switch knob in a position other than pyrolysis, the motor is energized again (if the temperature

  the enclosure is below the temperature required by the

6.

  tations), but turns in the opposite direction of the previous case.

  In this case, via the lever (4) and the cam (4b) the latch (5) goes up and releases the door, then the finger (11) presses on the tab of the micro-contact (1). ) to shut off the motor supply.

  According to the invention, the lock (5) controls by the

  a single finger (11), the two micro-contacts, the movement

  said latch being controlled by the single lever (4) completed by

the spring (3).

  Since the two microswitches are controlled by the same finger (11), the clearance between the arm (L) and the latch (V) is eliminated with respect to the device of the prior art.

  latch swinging game in a vertical plane parallel to the sup-

  Harbor. In addition the catch of the game of the vertical sliding of the lock is provided by the spring (3) continuously pulling in the same direction. The invention is not limited to the embodiment shown and described above but covers all the variants including the variants of shapes and dimensions of the parts.

constituent.

7.

Claims (7)

CLAIMS V E N D I C A T IO N S   1. Door locking and unlocking device for   cooking chamber, in particular for a net cooking chamber   pyrolytic cleaning, comprising a synchronous motor (7), a latch   movable bearing a latch (6), a return spring - (3), two micro-   contacts, characterized in that it further comprises: - on the one hand a single support (20) -portant the motor (7) and the latch (5), and at least one lateral guide means of said latch (5) secured to the support (20), on the other hand a single transmission arm (4) secured by one of its ends to the axis of the motor (7), comprising at its other end a hooking means (4a) for the spring   (3), a cam (4b) provided for driving the latch (5) in translation.   2. Locking and unlocking device for   cooking chamber, in particular for a net cooking chamber   Pyrolytic cleaning according to the preceding claim characterized in that the lock (5) is a substantially L-shaped flat metal rod and having at its low end a latch (6) and at its   high end at least one fastener (10a) and a lateral finger (11).   3. Locking and unlocking device for   cooking chamber, in particular for a net cooking chamber   pyrolytic cleaning according to any one of the preceding claims.   cedeentes characterized in that the lateral guide means of the lock is formed by a bar (8) and a plurality of boss (33), said bar (8) being secured to the support (20) by two sockets (30) blocked by screws (31), the bosses (33) being arranged in pairs facing each other, on the support plate (20) and the bar (8).   4. Device for locking and unlocking a door for a cooking chamber, in particular for baking cooking   pyrolytic cleaning according to any one of the claims   previous characterized in that it further comprises a lateral and vertical guide means of the latch (6) consisting of a rectangular slot (25) provided in the lower leg (24) of the support 8.   (20), said light having a plurality of guide chokes   height (32) adjusted to the thickness of the latch (6).   5. Locking and unlocking device for   cooking chamber, in particular for a net cooking chamber   pyrolytic cleaning according to any one of the preceding claims.   characterized in that the tongues of the two micro-contacts (1) (2) are positioned in the same vertical plane parallel to the axis of moving the lock (5).   6. Locking and unlocking device for   cooking chamber, in particular for a net cooking chamber   pyrolytic cleaning according to any one of the preceding claims.   characterized in that the spring is hooked on the one hand by hooking means (4a) of one end of the transmission arm (4) and on the other hand to one of the fasteners (10a, lob) provided in the end high lock (5).   7. Locking and unlocking device for   cooking chamber, in particular for a net cooking chamber   pyrolytic cleaning according to any one of the preceding claims.   characterized in that the finger (11) for controlling the tongues of   two micro-contacts (1) (2) is unique.