WO2020002456A1

WO2020002456A1 - Hob-extractor hood assembly

Info

Publication number: WO2020002456A1
Application number: PCT/EP2019/067053
Authority: WO
Inventors: Lorenzo BIAGINI; Lorenzo Lispi; Nebojsa Zecevic
Original assignee: B.S. Service S.R.L.
Priority date: 2018-06-29
Filing date: 2019-06-26
Publication date: 2020-01-02
Also published as: IT201800006807A1; EP3814686B1; EP3814686A1

Abstract

An assembly (100) comprising a hob (1) and an extractor hood (2) wherein a frame of the hob is mounted with possibility of sliding vertically in a housing (S) of a frame of the extractor hood in order to move from a raised position to a lowered position; said assembly (100) comprising guide means (4) to guide the vertical translation movement of the frame (11) of the hob relative to the frame of the hood; and actuation means (5) to actuate the hob (1).

Description

HOB-EXTRACTOR HOOD ASSEMBLY

The present invention refers to a hob-extractor hood assembly.

A kitchen generally comprises a hob and an extractor hood disposed above the hob in order to extract the fumes that are produced when cooking.

Extractor hoods are known, which are built-in in a worktop that supports the hob. These extractor hoods are known as downdraft extractor hoods because they move vertically. A downdraft extractor hood can move from a lowered position, in which it is flush with the worktop, to a raised position, wherein an extraction opening of the extractor hood protrudes in upper position relative to the worktop and is directed towards the hob in order to extract the fumes.

These types of downdraft extractor hoods are impaired by some drawbacks. The extractor hood that protrudes in upper position from the hob is an obstacle and such a hob is not suitable for being installed in a kitchen island. The installation and the maintenance of the extractor hood are rather complicated. The extractor hood is disposed only on one side of the hob, thus delivering a non-uniform extraction.

DE102015104470 discloses a hob with at least one heating surface unit that can be lowered in order to heat a vessel.

The purpose of the present invention is to eliminate the drawbacks of the prior art by providing a hob-extractor hood assembly that is efficient and aesthetically pleasant.

Another purpose of the present invention is to provide such a hob- extractor hood assembly that is reliable, practical, versatile, and easy to make and install.

These purposes are achieved according to the invention with the characteristics of the independent claim 1. Advantageous embodiments of the invention appear from the dependent claims.

The hob-extractor hood assembly of the invention is defined in claim

1 .

Such hob-extractor hood assembly has the following advantages.

The extractor hood does not protrude from the hob and creates no obstacle. Therefore, the hob can be accessed from the four sides and said hob-extractor hood assembly is suitable for being installed in a kitchen island.

The installation and the maintenance are simple because the extractor hood is fixed.

When the hob is lowered, there are at least two extraction openings of the extractor hood on two opposite sides of the hob, thus providing an efficient uniform extraction.

Additional features of the invention will appear clearer from the detailed description below, which refers to merely illustrative, not limiting embodiments, wherein:

Fig. 1 is a top view of the hob and extractor hood assembly according to the invention;

Fig. 2A is a diagrammatic sectional view taken along the plane ll-ll of Fig.1 , with the hob in raised position;

Fig. 2B is the same view as Fig. 2A, except for the hob in lowered position;

Fig. 3A is a diagrammatic sectional view taken along the plane Ill-Ill of Fig.1 , with the hob in raised position;

Fig. 3B is the same view as Fig. 3A, except for the hob in lowered position;

Figs. 4A and 4B are the same views as Figs. 3A and 3B, except in that they show a second embodiment of the actuation means of the hob;

Figs. 5A and 5B are the same views as Figs. 3A and 3B, except in that they show a third embodiment of the actuation means of the hob; Figs. 6A and 6B are the same views as Figs. 3A and 3B, except in that they show a fourth embodiment of the actuation means of the hob;

Figs. 7A and 7B are the same views as Figs. 6A and 6B, except in that they show a variant of the fourth embodiment of the actuation means of the hob;

Figs. 8A and 8B are the same views as Figs. 3A and 3B, except in that they show a fifth embodiment of the actuation means of the hob;

Figs. 9A and 9B are the same views as Figs. 8A and 8B, except in that they show a variant of the fifth embodiment of the actuation means of the hob;

Figs. 10A and 10B are two diagrammatic perspective views of the hob in raised position and in lowered position, respectively; and

Fig. 1 1 is an axonometric view of a second embodiment of the assembly according to the invention.

With reference to the Figures, the hob and extractor hood assembly is disclosed, which is generally indicated with reference numeral (100).

With reference to Figs.1 and 2A, the assembly (100) comprises a hob (1 ) and an extractor hood (2) suitable for being mounted in a worktop intended to support the hob (1 ).

The hob (1 ) comprises burners (10) that are preferably induction plates. The hob (1 ) is supported by a box-shaped frame (1 1 ) suitable for containing a support structure for operating the burners (10).

The extractor hood (2) comprises a frame that comprises:

- a base plate (20) from where external lateral walls (21 ) rise, and - an upper plate (22) from where internal lateral walls (23) rise (Fig.

3A) near the lateral borders of the frame (1 1 ) of the hob.

The internal lateral walls (23) have an extraction opening (26) (Fig. 2B) disposed in upper longitudinal position to let the air pass.

A lower chamber (C1 ) is defined between the base plate (23) and the upper plate (23). Two lateral chambers (C2) are defined between the external lateral walls (21 ) and the internal lateral walls (23). The lateral chambers (C2) are in communication with the lower chamber (C1 ). Filter units (3) are disposed in the lateral chambers (C2). Each filter unit (3) is fixed to the external and internal lateral walls (21 , 23) of the frame of the hood by means of magnets (33). A lid (32) is disposed on the filter unit (3) in order to close the lateral chamber (C2). The lid (32) can be a glass sheet.

Each filter unit (3) comprises a grease filter (30) disposed in the extraction opening (26) of the internal lateral wall, and an odor filter (31 ) disposed under the grease filter (30). For example, the grease filter (30) may comprise a wavy sheet metal with a labyrinth path in order to hold the grease. For instance, the odor filter (31 ) may comprise an odor-absorbing material, such as a ceramic material.

Although the figures only show two lateral chambers (C2) disposed in lateral position relative to the hob (1 ), the extractor hood (2) may be additionally provided with a back chamber and/or a front chamber disposed in a back position or in a front position relative to the hob. In such a case, the back chamber and the front chamber are in communication with the lower chamber (C1 ) and filter units are disposed in the back chamber and/or in the front chamber.

A box (24) with a fan (35) suitable for extracting the air is mounted under the base plate (20) of the frame of the extractor hood. The box (24) of the fan is in communication with the lower chamber (C1 ).

The frame (1 1 ) of the hob is mounted with possibility of sliding vertically in a housing (S) defined between the upper plate (22) and the internal lateral walls (23) of the frame of the extractor hood. In view of the above, the hob (1 ) can be moved from a raised position (Figs. 2A, 10A), wherein the hob (1 ) is at the same level as the lids (32) of the lateral chambers (C2) and the fan (25) cannot generate an air flow, to a lowered position (Figs. 2B, 10B), wherein the hob is under the level of the lids (32) of the lateral chambers in such a way to free the extraction openings (26) of the internal lateral walls (23) of the frame of the extractor hood, in such a way that the fan (25) can generate an air flow. With reference to Fig. 3B, when the hob is in lowered position, if the fan (25) of the extractor hood is actuated, the air is extracted from above the hob (1 ) in the direction of the arrow F1 in order to enter the extraction openings (26) of the internal lateral walls (23) of the frame of the extractor hood, where it is filtered by means of the filter unit (3). Then, the air flows in the lateral chambers (C2) in the direction of the arrow F2, enters the lower chamber (C1 ) according to the direction of the arrow F3 and reaches the box (24) of the fan according to the direction of the arrow F4.

With reference to Figs. 2A and 2B, drive means (4) drive a vertical translation of the hob (1 ) relative to the frame of the extractor hood (2).

The drive means (4) comprise guides (40) mounted in the frame of the extractor hood, and slides (41 ) fixed to the frame (1 1 ) of the hob and slidingly mounted in the guides (40). For illustrative purposes, two guides (40) may be provided, each of them being disposed in each internal lateral wall (23) of the frame of the extractor hood, and two slides (41 ) may be disposed in each lateral border of the frame (1 1 ) of the hob.

With reference to Figs. 3A and 3B, actuation means (5) move the hob (1 ) between the raised position and the lowered position, and vice versa.

An electronic unit (6) is disposed in a box under the base plate of the frame of the extractor hood in order to control the fan (25) of the extractor hood and the actuation means (5) of the hob.

A control panel (7) (Fig.1 ) is disposed in a front position relative to the hob (1 ) in order to be used by the user. The control panel (7) comprises keys or knobs to actuate the actuation means (5) in order to lower and raise the hob and actuate the fan (25) of the extractor hood.

According to a first embodiment, the actuation means (5) comprise at least one linear actuator (50) disposed in vertical position. The linear actuator (50) is disposed centrally in a housing (S1 ) obtained in the frame of the extractor hood in communication with the housing (S) of the frame of the extractor hood that receives the frame (1 1 ) of the hob. Although Figs. 3A and 3B only show one linear actuator disposed centrally, multiple linear actuators may be provided in different positions.

For illustrative purpose, the linear actuator (50) comprises a cylinder-piston unit (51 ), in which the cylinder is fixed to the base plate (20) of the frame of the extractor hood and a stem (52) of the piston is fixed to the frame (1 1 ) of the hob. The cylinder-piston unit can be of electric, pneumatic, hydraulic or magnetic type. Other types of linear actuators can be used instead of the cylinder-piston unit, such as screw-mother screw, pinion-rack and the like.

With reference to Figs. 4A and 4B, a second embodiment of the actuation means (105) is disclosed. The actuation means (105) comprise actuators (150) disposed in lateral position relative to the frame (1 1 ) of the hob.

Each actuator (150) comprises a toothed wheel (151 ) that engages with a rack (152). The toothed wheel (151 ) is revolvingly mounted in the frame of the extractor hood and is actuated by an electric motor. The rack (152) is fixed to the lateral border of the frame (1 1 ) of the hob.

With reference to Figs. 5A and 5B, a third embodiment of the actuation means (205) is disclosed. The actuation means (205) comprise a linear actuator (50) disposed in horizontal position in order to actuate a follower (253) that cooperates with a cam (12) that protrudes in lower position from the frame (1 1 ) of the hob. The follower (253) and the cam (12) have a geometrical shape suitable for converting the horizontal movement of the linear actuator (50) in a vertical movement of the hob (1 ).

For illustrative purpose, the follower (253) and/or the cam (12) can have a wedge-like shape. The follower (253) has an inclined plane (254) and a horizontal plane (255). The cam (12) has a horizontal plane (13) and an inclined plane (14). When the hob (1 ) is in raised position (Fig. 4A), the horizontal planes (255, 13) of the follower and of the cam are in mutual contact. During the movement of the linear actuator (50), the inclined plane (154) of the follower slides on the inclined plane (14) of the cam, lowering the hob (1 ). With reference to Figs. 6A and 6B, a fourth embodiment of the actuation means (305) is disclosed. The actuation means (305) comprise at least one eccentric cam (350) that cooperates with a lower wall of the frame (1 1 ) of the hob.

The eccentric cam (350) has a practically elliptical shape with a major axis (a). The eccentric cam is pivoted in an eccentric pivoting axis (351 ). The eccentric cam (350) is moved by moving means, such as a motor or an actuator, in such a way to rotate around its eccentric pivoting axis (351 ). When the major axis (a) of the eccentric cam is disposed in vertical position, the hob (1 ) is in raised position (Fig. 6A). When the major axis (a) of the eccentric cam is disposed in horizontal position, the hob (1 ) is in lowered position (Fig. 6B). Although Figs. 6A and 6B only show one eccentric cam (350) disposed centrally, multiple eccentric cams may be provided in different positions.

With reference to Figs. 7A and 7B, a possible moving system of the eccentric cam (350) is disclosed. Such a moving system comprises a linear actuator (50) disposed in horizontal position. The stem (52) of the linear actuator is connected to a rack (355) that engages with a toothed wheel (356) integral with the eccentric cam (350). The axis of rotation of the toothed wheel (356) coincides with the eccentric pivoting axis (351 ) of the eccentric cam.

With reference to Figs. 8A and 8B, a fifth embodiment of the actuation means (405) is disclosed. The actuation means (405) comprise a linear actuator (50) disposed in horizontal position that moves a lever mechanism (9) suitable for lowering and raising the hob (1 ). For illustrative purposes, the lever mechanism (9) can be of scissors, pantograph or lazy tongue type, and the like. In the example of Figs. 8A and 8B, the lever mechanism (9) is of scissors type. The lever mechanism (9) comprises two levers (90, 91 ) that are hinged in a pivot (92) disposed in a central position of the levers. A first end (90a) of the first lever (90) is connected to the stem (52) of the linear actuator (50), and a second end (90b) of the first lever can slide under the frame (11 ) of the hob. A first end (91 a) of the second lever (91 ) can slide on the base plate (20) of the frame of the extractor hood, and a second end (91 b) of the second lever can slide under the frame (1 1 ) of the hob.

With reference to Figs. 9A and 9B, a variant of the lever mechanism (109) of pantograph type is disclosed. The lever mechanism (109) comprises a first lever (190) with a first end (190a) connected to the stem (52) of the linear actuator, and a second end pivoted at a first end of a second lever (191 ) in a pivot (192), which is mounted with possibility of sliding vertically in a slot (193) obtained in a flange fixed to the frame (1 1 ) of the extractor hood. A second end (191 b) of the second lever can slide under the frame (11 ) of the hob.

With reference to Fig. 1 1 , a second embodiment of the assembly according to the invention is disclosed, which is generally indicated with reference numeral 200.

The assembly (200) comprises a hob (1 ) supported by a frame (1 1 ) and two extractor hoods (2) suitable for being mounted in a worktop intended to support the hob (1 ).

Each extractor hood (2) comprises a box (24). Each box (24) contains a fan (25) that blows air outside the box, and a lateral chamber (C2). The boxes (24) are mounted in adjacent position to the lateral chambers (C2) along each side of the hob (1 ), in such a way that the sum of the lengths of a box (24) and of a lateral chamber (C2) is equal to the length of the side of the hob (1 ).

The box (24) of one side of the hob is disposed in front of a lateral chamber (C2) of the other side of the hob; otherwise said, each lateral chamber (C2) is disposed on one side of the hob (1 ) opposite to the side with the box (24).

Each extractor hood (2) comprises a filter unit (3) disposed in the lateral chamber (C2), and a lid (32) that closes the lateral chamber (C2) on the filter unit (3).

The lateral chamber (C2) has an upper extraction opening (226). The upper extraction opening (226) of each lateral chamber (C2) is obtained in upper position relative to the lateral chamber (C2).

Each box (24) comprises a delivery outlet (24a) for emitting the air delivered by the fan (25) and an extraction outlet (24b). The delivery outlet (24a) is directed towards the hob (1 ) and towards the upper extraction opening (226) of the lateral chamber (C2) disposed on the opposite side of the hob. The fan (25) comprises a mouth directed towards the delivery outlet (24a) of the box (24) in such a way that, when the fan (25) is in operation, an air flow (F5) blown by the fan (25) is pushed towards the extraction openings (226) of the lateral chambers (C2). The extraction outlet (24b) allows the fan to extract the air from the exterior.

The assembly (200) comprises a housing (S) defined between the box (24) and the lateral chamber (C2).

The frame (1 1 ) of the hob is mounted in the housing (S), with possibility of sliding vertically.

The assembly (200) comprises drive means (4) to guide the vertical translation movement of the frame (1 1 ) of the hob relative to the extractor hood (2), and actuation means (5; 105; 205; 305; 405) to move the hob (1 ).

The drive means (4) and the actuation means (5; 105; 205; 305; 405) are exactly the same as the ones described with reference to the first embodiment of the assembly (100).

In view of the above, the assembly (200) translates from a raised position, in which the hob (1 ) covers the delivery outlets (24a) of the boxes (24), to a lowered position, in which the hob (1 ) is under the level of the delivery outlets (24a) of the boxes (24) and under the level of the upper extraction opening (226) of the lateral chambers (C2), in such a way that an air flow (F5) blown by the fan (25) tends to flow in contact with the surface of the hob (1 ) because of the Coanda effect, generating such a depression that vapors and odors coming from the pots disposed on the hob (1 ) are conveyed towards the air flow (F5) that touches the hob.

Consequently, the air flow (F5) blown by the fan (25) transports the vapors and odors coming from the pots disposed on the hob (1 ) towards the extraction opening (26) of the lateral chamber (C2) disposed on the opposite site of the hob (1 ) relative to the fan (25) that generates the air flow (F5).

Although the description refers to an assembly (200) with two extractor hoods, the assembly (200) can comprise only one extractor hood (2) with a fan (25) disposed in a box (24) positioned on one side of the hob

(1 ) and a lateral chamber (C2) disposed on one side of the hob (1 ) opposite to the side with the box.

Numerous equivalent variations and modifications can be made to the present embodiments of the invention, which are within the reach of an expert of the field, falling in any case within the scope of the invention as disclosed by the appended claims.

Claims

1. Assembly (100) comprising a hob (1 ) supported by a frame (1 1 ) and an extractor hood (2) suitable for being mounted in a worktop intended to support the hob (1 );

the extractor hood (2) comprises:

- a frame comprising a base plate (20) from where external lateral walls (21 ) rise, and an upper plate (22) from where internal lateral walls (23) rise; the internal lateral walls (23) being provided with extraction openings (26) disposed in upper longitudinal position to let the air pass;

- a lower chamber (C1 ) defined between the base plate (20) and the upper plate (22);

- two lateral chambers (C2) defined between the external lateral walls (21 ) and the internal lateral walls (23); the lateral chambers (C2) being in communication with the lower chamber (C1 );

- filter units (3) disposed in the lateral chambers (C2);

- lids (32) that cover the lateral chambers (C2) on the filter units (3);

- a fan (25) disposed in a box (24) in communication with the lower chamber (C1 );

- a housing (S) defined between the upper plate (22) and the internal lateral walls (23) of the frame of the extractor hood;

wherein said frame (1 1 ) of the hob is mounted with the possibility of sliding vertically in said housing (S) of the frame of the extractor hood in order to move from a raised position, wherein the hob (1 ) is at the level of the lids (32) of the lateral chambers (C2), to a lowered position, wherein the hob (1 ) is under the level of the lids (32) of the lateral chambers (C2), in such a way as to free the extraction openings (26) of the lateral walls of the frame of the extractor hood;

said unit (100) comprising:

- drive means (4) to drive the vertical translation movement of the frame (1 1 ) of the hob relative to the frame of the extractor hood; and

- actuation means (5; 105; 205; 305; 405) to move said hob (1 ).

2. The assembly (200) comprising a hob (1 ) supported by a frame (11 ) and at least one extractor hood (2) suitable for being mounted in a worktop intended to support the hob (1 );

the extractor hood (2) comprises:

- a fan (25) disposed in a box (24) provided on one side of the hob

(1 ),

- a lateral chamber (C2) disposed on one side of the hob (1 ) opposite to the side with the box,

- a filter unit (3) disposed in the lateral chamber (C2), and

- a lid (32) that closes the lateral chamber (C2) on the filter unit (3); said lateral chamber (C2) being provided with an upper extraction opening (226),

said box (24) being provided with a delivery outlet (24a) for emitting the air delivered by the fan (25); said delivery outlet (24a) being directed towards said hob (1 ) and towards said upper extraction opening (226) of the lateral chamber;

the assembly (200) comprises a housing (S) defined between the box (24) and the lateral chamber (C2);

wherein said frame (1 1 ) of the hob is mounted in said housing (S) with possibility of sliding vertically, in order to move from a raised position, in which the hob (1 ) covers the delivery outlet (24a), to a lowered position, in which the hob (1 ) is under the level of the delivery outlet (24a) and under the level of the upper extraction opening (226) of the lateral chamber (C2), in such a way that an air flow (F5) blown by the fan (25) tends to flow in contact with the surface of the hob (1 ) because of the Coanda effect, generating such a depression that vapors and odors coming from the pots disposed on the hob (1 ) are conveyed towards the air flow (F5) that touches the hob;

said assembly (200) comprising:

- drive means (4) to guide the vertical translation movement of the frame (1 1 ) of the hob relative to the extractor hood (2); and

- actuation means (5; 105; 205; 305; 405) to move said hob (1 ).

3. The assembly (100; 200) of claim 1 or 2, wherein said drive means (4) comprise guides (40) mounted in the frame of the extractor hood, and slides (41 ) fixed to the frame (11 ) of the hob and slidingly mounted in the guides (40).

4. The assembly (100; 200) of any one of the preceding claims, wherein said actuation means (5) comprise at least one linear actuator (50) disposed in vertical position between the frame of the extractor hood and the frame (1 1 ) of the hob.

5. The assembly (100; 200) of any one of claims 1 to 3, wherein said actuation means (105) comprise an actuator (50; 50) comprising a toothed wheel (151 ) actuated by an electrical motor that engages with a rack (152) fixed to a lateral border of said frame (1 1 ) of the hob.

6. The assembly (100; 200) of any one of claims 1 to 3, wherein said actuation means (205) comprise a linear actuator (50) disposed in horizontal position in order to actuate a follower (253) that cooperates with a cam (12) that protrudes in lower position from the frame (1 1 ) of the hob; the follower (253) and the cam (12) having a suitable geometric shape in order to convert the horizontal movement of the linear actuator (50) into a vertical movement of the hob.

7. The assembly (100; 200) of claim 6, wherein the follower (253) and/or the cam (12) have a wedge-like shape.

8. The assembly (100; 200) of any one of claims 1 to 3, of claim 1 or 2, wherein said actuation means (305) comprise moving means to move at least one eccentric cam (350) that cooperates with a lower wall of the frame (1 1 ) of the hob; the eccentric cam (350) having a substantially elliptical shape with a major axis (a) and being pivoted in an eccentric pivoting axis (351 ).

9. The assembly (100; 200) of claim 8, wherein said actuation means of the eccentric cam comprise a linear actuator (50) disposed in horizontal position, which moves a rack (355) that engages with a toothed wheel (356) integral with said eccentric cam (350).

10. The assembly (100; 200) of any one of claims 1 to 3, wherein said actuation means (405) comprise a linear actuator (50) that moves a lever mechanism (9; 109) suitable for lowering and raising the hob (1 ).

11. The assembly (100; 200) of claim 10, wherein said lever mechanism (9; 109) is of scissors, pantograph or lazy tongue type.

12. The assembly (200) of any one of claims 2 to 1 1 , when depending on claim 2, comprising two extractor hoods (2), wherein each extractor hood comprises a box (24) where the fan (25) is mounted and a lateral chamber (C2) disposed in front of the box (24), wherein the boxes (24) are mounted in adjacent position to the lateral chambers (C2) along each side of the hob (1 ), in such a way that the sum of the lengths of a box (24) and of a lateral chamber (C2) is equal to the length of the side of the hob (1 ).