Magnetic safety switch device for food processor

Claim 2

A magnetic safety device in combination with a food processor comprising a base, an electric motor enclosed by the base, an electric control circuit for the motor, a working vessel including a bowl and a cover removably locked on the bowl, an means for locking the bowl on the base in a working position, the safety device comprising a magnetically controlled working contact mounted inside the base and connected to the electric control circuit, a duct integral with the bowl and extending along a generatrix of the bowl, said duct containing a rod made of ferromagnetic material extending fixedly therein, such that when the bowl is locked on the base in a working position, a lower end of the rod is adjacent to and facing the working contact, and a permanent magnet secured to the cover, such that when the cover is locked on the bowl, the magnet is adjacent to and facing an upper end of the rod.

Claim 3

A magnetic safety device in combination with a food processor comprising a base, an electric motor enclosed by the base, an electric control circuit for the motor, a working vessel including a bowl and cover removably locked on the bowl, the cover including a chute, means for locking the bowl on the base in a working position, and a pusher for pressing inserted products into the chute, the safety device comprising a duct extending along a generatrix of the bowl, a magnetically controlled working contact connected with the electric control circuit for the motor and mounted to the base so as to be disposed under the duct in working position of the bowl, a permanent magnet secured to the pusher and a magnetic circuit adapted to convey the flux introduced by the permanent magnet, when the pusher is inserted into the chute, to the magnetically controlled working contact.

Claim 4

A magnetic safety device in combination with a food processor comprising a base, an electric motor enclosed by the base, an electric control circuit for the motor, a working vessel including a bowl and cover removably locked on the bowl, the cover including a chute, means for locking the bowl on the base in a working position, and a pusher for pressing inserted products into the chute, the safety device comprising a duct extending along a generatrix of the bowl, a magnetically controlled working contact connected with the electric control circuit for the motor and mounted to the base so as to be disposed under the duct in working position of the bowl, a permanent magnet secured to the pusher and a magnetic circuit adapted to convey the flux introduced by the permanent magnet, when the pusher is inserted into the chute, to the magnetically controlled working contact.

Claim 5

A magnetic safety device according to claim 2 wherein the magnetic circuit comprises a rod of magnetic material extending along the duct, the duct extending between the base and the top of the chute.

Claim 6

A magnetic safety device according to claim 2 wherein the magnetically controlled circuit comprises two rods of ferromagnetic material, one secured to the bowl and the other to the cover, the two rods coming in line with the magnetically controlled working contact when the bowl is locked to the base and the cover is locked to the bowl, thus magnetically coupling the permanent magnet to the magnetically controlled working contact.

Claim 7

A magnetic safety device according to claim 2 wherein the pusher has a cross-section which is such that when the pusher is inserted in the chute, the permanent magnet comes opposite and near the magnetic circuit.

Claim 8

A magnetic safety device according to claim 2 wherein the pusher has funnel-shaped inner walls for inserting products.

Claim 9

A magnetic safety device in combination with a food processor comprising a base, an electric motor enclosed by the base, an electric control circuit for the motor, a working vessel including a bowl and a cover removably locked on the bowl, and means for locking the bowl on the base in a working position the safety device comprising a duct extending along a generatrix of the bowl, a magnetically controlled working contact connected with the electric control circuit for the motor and mounted to the base so as to be disposed under the duct in the working position of the bowl, a mobile assembly slidably mounted inside the duct and having top and bottom ends, first and second magnets affixed to said top and bottom ends, respectively, a permanent magnet situated to be brought above the mobile assembly when said cover and bowl are locked, and the permanent and the first magnet having the same polarity so as to produce repulsion when the cover is locked on the bowl.

Claim 10

A magnetic safety device in combination with a food processor comprising a base, an electric motor enclosed by the base, an electric control circuit for the motor, a working vessel including a bowl and a cover removably locked on the bowl, and means for locking the bowl on the base in a working position the safety device comprising a duct extending along a generatrix of the bowl, a magnetically controlled working contact connected with the electric control circuit for the motor and mounted to the base so as to be disposed under the duct in the working position of the bowl, a mobile assembly slidably mounted inside the duct and having top and bottom ends, first and second magnets affixed to said top and bottom ends, respectively, a permanent magnet situated to be brought above the mobile assembly when said cover and bowl are locked, and the permanent and the first magnet having the same polarity so as to produce repulsion when the cover is locked on the bowl.

Claim 11

A magnetic safety device according to claim 7, wherein the mobile assembly comprises a rod and a spring for returning the rod to its top position.

Claim 12

A magnetic safety device according to claim 7 wherein the mobile assembly comprises a liquid disposed in the duct and a gas-filled tube immersed in the liquid.

Claim 13

A magnetic safety device according to claim 9 wherein said working vessel carries another permanent magnet mounted below said mobile assembly and parallel to the permanent magnet, the permanent magnets having opposite polarity so as to maintain the tube in neutral balance inside the duct.

Claim 14

A magnetic safety device in combination with a food processor comprising a base, an electric motor enclosed by the base, an electric control circuit for the motor, a working vessel including a bowl and a cover removably locked on the bowl, and means for locking the bowl on the base in a working position, the safety device comprising a duct extending along a generatrix of the bowl, a magnetically controlled working contact connected with the control circuit and mounted to said base so as to be under the duct in the working position of the bowl, the cover including a cam and the safety device further comprising a pusher slidably mounted inside the duct, the pusher having a top end engageable with said cam and a bottom end, a permanent magnet secured to the bottom end of the pusher, said permanent magnet modifying the state of the magnetically controlled working contact when the permanent magnet approaches or moves away from the magnetically controlled working contact under the action of said cam coming in and out of contact with the top end of the pusher.

Claim 15

A magnetic safety device in combination with a food processor comprising a base, an electric motor enclosed by the base, an electric control circuit for the motor, a working vessel including a bowl and a cover removably locked on the bowl, and means for locking the bowl on the base in a working position, the safety device comprising a duct extending along a generatrix of the bowl, a magnetically controlled working contact connected with the control circuit and mounted to said base so as to be under the duct in the working position of the bowl, the cover including a cam and the safety device further comprising a pusher slidably mounted inside the duct, the pusher having a top end engageable with said cam and a bottom end, a permanent magnet secured to the bottom end of the pusher, said permanent magnet modifying the state of the magnetically controlled working contact when the permanent magnet approaches or moves away from the magnetically controlled working contact under the action of said cam coming in and out of contact with the top end of the pusher.

Claim 16

A magnetic safety device according to claim 11 further comprising a second permanent magnet mounted to said working vessel and a second magnetically controlled working contacted connected in series with the first magnetically controlled contact in the electrical control circuit and mounted to said base so as to be under said second permanent magnet in the working position of the bowl.

Claim 17

A magnetic safety device for a food processor in accordance with claim 4 wherein said magnetically controlled working contact is a single working contact connected in said control circuit.

Claim 18

A magnetic safety device according to claim 11 wherein said contct is mounted within said base and the surface portion of said base above said contact is solid.

Claim 19

A magnetic safety device according to claim 14 wherein said surface portion is flat.