FR2489719A1 - FOG VENT HOOD - Google Patents

Abstract

THE SWITCHING DEVICE 1 IS COMPLETED BY THE ADDITION OF A TIMING DEVICE WHICH AUTOMATICALLY STOPS THE BLOWER DRIVE MOTOR AFTER A DETERMINED TIME HAS ELAPSED, THE TIMING DEVICE IS CONSTITUTED BY A BIMETALLIC BLADE 2 WHICH IS HOT SUPPLIED WITH CURRENT THROUGH THE SWITCHING DEVICE 1, THE BIMETALLIC BLADE 2 HAS A PROJECT 6 FOR ITS SNAPPING WITH THE SWITCHING DEVICE.

Description

i

  The present invention relates to a fume hood

  fogging evacuation intended to be installed above a

  stove or the like and which has a blower as-

  pirating and evacuating cooking fumes and whose drive motor can be switched on and off by a device

  positive gradual power switching.

  We already know from patent application DE 2 272 710

  such a hood for fogging. In a hot-

  te of this type, the motor driving the blower is generally

  LEMENT started by means of a switching device which also controls its stopping when the operation

  blower is no longer required. The stop of the souf-

  flerie can then be done directly at the end of a

  cooking or, if necessary, only after cooking

  a certain amount of time. In this form of reaction

  the hood, stopping the blower always requires

  days the presence of a person to operate the switching device. However, hoods are also known

  fogging devices that include a time delay device

  automatic station for the blower drive motor

  flerie and which allows, by pressing an additional button

  to program the engine so that it does not stop

  automatically only after a certain time has elapsed.

  The object of the present invention is to create for a

  fogging hood, of the type defined above, a device

  positive delay automatically controlling, after a determined time, the stopping of the blower drive motor and which can be carried out and mounted in a simple manner while retaining its electrical and mechanical operation

  perfect despite the humidity produced by the vapors.

  The above problems are solved in accordance

  to the invention by a fume hood which is concealed

  characterized in that the switching device is com-

  supplemented by the addition of a timing device which

  automatically stops the blast drive motor

  laugh after a certain time has elapsed, in that the

  positive delay consists of a bimetal blade

  heating plug which is supplied with current via

  diary of the switching device and in that the blade bi-

  metal has a projection for its snap-fastening with

the switching device.

  The automatic timing device according to the invention is distinguished in particular by an operation

safe and long lasting.

  Various other features of the invention res-

  emerge from the detailed description which follows.

  Dorms of realization of the object of the invention

  of the invention are shown, by way of non-limiting examples.

mitatives, to the accompanying drawings,

  Fig. 1 shows the principle of setting the available

  step-by-step switching power for the blower drive motor as well as the

  automatic timer associated with the switching device

tion.

  Fig. 2 shows a practical embodiment

  than the automatic timing device.

  Fig. 3 is the electrical diagram of the automatic timing device, FIGS. 4a and 4b represent, in the form of

  electrical diagrams, improvements to the layout

  time delay according to the invention.

  Fig. 1 shows an electric adjustment device

  taper preferably in the form of a linear displacement switch 1 for switching on and off by actuating a contact 10 and for adjusting the speed of rotation of the blower drive motor

  for continuous adjustment of the suction power

  ration. The engine rotation speed is increased

  gradually sliding the slide switch

  linearly 1 to the left, while a sliding of the latter to the right, that is to say towards the position

  A ", controls the operation of a timing device

  automatic delaying, for a specified period of time

  undermined, stopping the drive motor. Thanks to this delay device, it is obtained that the drive motor of the blower of the fogging hood continues to run for a certain time and without supervision to

then stop automatically.

  The timer is made up of

  essentially by a heated bimetallic strip 2 as a time delay element as well as by a contact 3 of the

  involved in establishing the electrical circuit for heating

  the bimetallic blade and by a contact 4 controlling the power supply circuit of the drive motor 5. The

  heated bimetallic blade 2 has an inclination projection

  quêtage 6 which can be engaged in recesses in

  sawtooth shape 7 provided on the switch

  linear placement 1. The number of recesses in the shape of a sawtooth 7 is a function of different delay times possibly provided for the delayed stop of the motor 5. After a determined stroke of the linear displacement switch 1, the contacts 3, 4 are closed and the material b blade engages by its projection 6 in

  one of the recesses in the shape of a sawtooth 7. Under the eff-

  heating effect the bimetallic strip 2 slowly bends in the direction of the arrow (fig. 2) until the projection 6 emerges from the recess 7. The movement switch

  line 1 is then released and contacts 3, 4 open

  which has the effect of interrupting, on the one hand, the

  supply baking of the drive motor 5 for the blower and, on the other hand, the heating circuit of the bimetallic blade 2,

  When you connect a resistor 8 or a component

  corresponding electronic health 9 in series with the motor

  drive 5, it is also possible to adjust the speed

  rotation speed and therefore the suction power even when the automatic delay device

  located in position "A" (fig. 4a and 4b).

Claims (3)

  1 - Fume extraction hood intended to be installed   mounted above a stove or the like and which has a blower which sucks in and discharges cooking vapors and whose drive motor can be switched on and off   circuit by a power switching device gra-   dual, characterized in that the switching device   (1) is completed by the addition of a timing device   sation which automatically stops the drive motor (5) of the blower after expiration of a determined time, in that the delay device consists of a bimetallic heating blade (2) which is supplied with current via the switching device (1) and in that the bimetallic strip (2) has a projection (6) for   its snap-fastening with the switching device.   2 Fume extraction hood according to the claim   tion 1 characterized in that the switching device (1) has several snap-in recesses (7) for the bimetallic blade (2).   3 - Fume extraction hood according to the claim   cation 1, characterized in that a resistor (8) or a com-   corresponding electronic fitting (9) are connected in series with the drive motor (5) and its control contact (4),