FR2750310A1 - Knife with saw blade to open oyster - Google Patents

Abstract

The knife has a handle (4) to which a wire saw (5), made of tungsten carbide, is fixed. This is used to make a small cut at the edge of the oyster and towards its central part. A blade (2) is fixed to the handle and has a very thin end (1) which is put into the cut to make a small hole. The wider part of the blade has cutting edges which is put into the hole to lever the valves apart and to cut the muscle of the oyster.

Description

 The present invention relates to a device for opening oysters easily and safely.

 The opening of oysters is traditionally done using a knife, which requires effort on the part of the user and can injure him during this operation.

The device according to the invention overcomes these drawbacks. I1 indeed has according to a first characteristic a tungsten carbide saw filament (5) fixed on a handle (4).

For example, the filament is 4 cm long and its diameter is 1.5 mm. This saw filament is currently sold commercially for cutting ceramics and porcelain.

 The user takes the device by the handle (4) and saws the edge of the oyster perpendicularly, where the two valves meet and towards the central part of the oyster (where the oyster muscle is located) . The user makes a small opening of a few millimeters (3 to 6 mm) and 2 to 3 mm wide approximately. If you use another type of saw (metal etc.) it is very difficult to make this start. Indeed tungsten like diamond, is a material of great hardness and the small asperities made on its surface allow a flexible and efficient sawing on the shell.

 According to the invention, the device also comprises a blade (2), one end (1) of which is very thin, cruciform in shape at its tip.

For example, the length of this point (1) is 8 mm, its thickness 1 mm. As an example always, the base of the tip is 3 mm.

 The user who holds the device by the handle (4) causes the tip (1) of the blade to penetrate into the oyster through the opening made previously.

To carry out this operation, the user presses the tip (l) into the opening while carrying out alternating rotational movements of his hand so that the tip is introduced between the two valves while making a small orifice.

The flared part of the blade (2) enters the oyster in the same way through the orifice, then by a leverage by moving the two valves apart. The edges of the blade (6) shown in profile in FIG. 2 are sharp, which allows the blade to be introduced more easily into the oyster and to cut the muscle of the oyster. The user moves the two valves apart by a rotary movement of the blade (2) to open the oyster.

 The oyster kept its water, and a tiny amount of shell debris could have entered it.

Another advantage of the process is that one can realize the opening first and delay the opening time.
According to the invention, the device also comprises a guard (3) fixed on the handle (4) which serves as a retainer in the event that the blade slips.

Claims (3)

1) Device for opening oysters characterized in that  that it has a handle (4) on which is fixed a  filament tungsten carbide saw (5) to make  by sawing a small cut at the edge of the oyster, there  where the two valves meet and towards the central part  oyster. 2) Device according to claim (1) characterized in that  that it comprises a blade (2) whose end (1) very  fine can be introduced into the oyster through the opening  previously made by making a small hole in it. 3) Device according to the preceding claims 1 and 2  characterized in that it comprises a blade (2), one of which  very flared part has sharp edges which,  when the blade is inserted into the hole, spread by  leverage the two oyster valves and then  sever the oyster muscle.