Base plate for a vacuum cleaner suction head for the suction of fine dust and large debris
A base plate for a vacuum cleaner suction head is described, said base plate comprising a lower face, an upper face and a base plate channel open towards the surface to be vacuumed. The channel extends across the whole width of the base plate. The base plate channel comprises a front edge and a rear edge. The lower face comprises: a first surface which extends along the whole front edge of the channel and a second surface which extends along the whole rear edge of the channel, the first and second surfaces lying in a same horizontal plane. The lower face also comprises a front inclined surface extending from said first surface towards the front side. According to the invention, the front inclined surface is inclined upwards so that the front side is raised with respect to the surface to be vacuumed.
1. A base plate for a suction head for a vacuum cleaner, the base plate comprising:
a lower face configured so as to be directed towards a surface to be vacuumed,
an opposite upper face, and
a base plate channel open towards the surface to be vacuumed,
wherein said lower face comprises a front side, a rear side and two lateral sides,
wherein said base plate channel extends across a width of said base plate,
wherein the base plate channel comprises a front edge and a rear edge,
wherein the lower face comprises:
a first surface extending along the entire front edge of the base plate channel and extending towards the front side of the base plate over a first length;
a second surface extending along the entire rear edge of the base plate channel and extending towards the front side of the base plate over a second length, wherein the first and second surfaces lie in a common horizontal plane; and
a front inclined surface extending from said first surface towards the front side;
wherein said front inclined surface is inclined upwards so that the front side is raised with respect to the surface to be vacuumed;
wherein said front inclined surface is inclined at a front angle of attack of between 10° and 20°; and
wherein the first length is shorter than the second length.
2. The base plate of claim 1 , wherein said front inclined surface is inclined at an angle of attack of between 11° and 14°.
3. The base plate of claim 1 , wherein said front inclined surface extends directly from a most forward edge of the first surface, without any curved surface between said front inclined surface and said first surface.
4. The base plate of claim 1 , wherein the front side is raised by 2.0-5.0 mm from the surface to be vacuumed.
5. The base plate of claim 1 , wherein said first surface extends by 1.0 to 10.0 mm towards said front side.
6. The base plate of claim 1 , wherein said second surface extends by 2.0 to 10.0 mm towards said rear side.
7. The base plate of claim 1 , comprising also a rear inclined surface which extends from said second flat surface to the rear side.
8. The base plate according to claim 7 , wherein said rear inclined surface is inclined at rear angle of attack smaller than the front angle of attack.
9. The base plate of claim 7 , wherein said rear inclined surface extends directly from a rearmost edge of the second flat surface, without any curved surface between said rear inclined surface and said second flat surface.
10. The base plate of claim 1 , wherein the base plate channel has a front surface inclined at an angle relative to the surface connecting the front edge and the rear edge and wherein the base plate channel has a rear surface inclined at the same angle with respect to a surface connecting the front edge and the rear edge.
11. The base plate of claim 10 , wherein the front edge is shaped with a nose facing the rear edge.
12. The base plate of claim 1 , wherein said channel has closed ends at the lateral sides of said base plate and wherein said base plate comprises also a third and a fourth horizontal flat surface extending from end edges of the base plate channel to respective short sides of the base plate so that a single flat surface formed by the first flat surface, the second flat surface, the third flat surface and the fourth flat surface is formed around a whole perimeter of the base plate channel.
13. The base plate of claim 1 , wherein at least one end of said channel comprises a hole or an aperture.
14. The base plate of claim 1 , further comprising a first strip of velvet or the like on said front inclined surface and a second strip of velvet on said flat rear surface.
15. A suction head comprising:
a base plate comprising a base plate channel which is open towards a surface to be vacuumed;
a suction channel in fluid communication with the channel of the base plate; and
a covering body connected to at least one of said base plate and said suction channel;
wherein the base plate comprises a lower face configured to be directed towards the surface to be vacuumed and an opposite upper face, the base plate channel comprising a front edge and a rear edge,
wherein said lower face a front side, a rear side and two lateral sides;
wherein said base plate channel extends across a width of said base plate;
wherein the lower face comprises:
a first surface extending along the entire front edge of the base plate channel and extending towards the front side of the base plate over a first length;
a second surface extending along the entire rear edge of the base plate channel and extending towards the front side of the base plate over a second length, wherein the first and second surfaces lie in a common horizontal plane; and
a front inclined surface extending from said first surface towards the front side;
wherein said front inclined surface is inclined upwardly so that the front side is raised with respect to the surface to be vacuumed,
wherein said front inclined surface is inclined by a front angle of attack comprised between 10° and 20°; and
wherein the first length is shorter than the second length.