VENT CAP FOR OIL TANKS OF MACHINES AND THE LIKE EQUIPPED WITH SPLASH GUARD

Abstract

The invention concerns a vent cap for oil tanks of machines and motor equipment, comprising a cup (1), equipped with means of engagement (4) with the seat of the tank filler, and a lid (12) mounted on the cup and which snaps thereon. Between the cup (1) and the lid (12) there is a gap allowing the vapour outflow from the tank to the outer environment or viceversa. According to the invention, said lid (12) comprises two cylindrical diaphragms (12b, 12c), concentric to the cap axis and which, in cooperation with the cup (1), form labyrinth means for the flow of vapours and air. Cup (1) also carries a guide (7) supporting a level rod (8), consisting of a central, cylindrical main body (7b), wherefrom ribs (7a) for anchoring to the cup (1) depart. Guide (7) extends, at the top, into two flexible flaps (7c), provided with means of engagement (10) of the rod (8).

Description

The cap according to the invention will now be described, with reference to a particular variant thereof, as it is illustrated in the drawings, wherein:

FIG. 1 is a side view of the cap according to the invention, whereof

FIG. 2 is an axial section view according to the line A-A of FIG. 1;

FIG. 3 is a view similar to FIG. 2, in an axial section according to the line B-B of FIG. 2;

FIG. 4 is a top perspective view of the cup portion only of the cap according to the invention, with the level rod mounted;

FIG. 5 is a bottom view of the lid portion only of the cap according to the invention; and

FIG. 6 is a bottom perspective view of the lid only.

Claims

1. Vent cap for oil tanks of machines and motor equipment, of the type comprising a cup (1), equipped with means of engagement (4) with the housing of the tank filler, and a lid (12) mounted on the top of the cup and which snaps thereon, integral in the movement thereof, a gap being provided between the cup (1) and the lid (12) allowing the outflow of the vapours found in said tank or viceversa, characterised in that said lid provides at least two cylindrical diaphragms (12b, 12c), concentric to the cap axis and which, when cooperating with the cup (1), are labyrinth means only for the flow of vapours and air.

2. Vent cap as claimed in claim 1, characterised in that said cup (1) carries a guide (7) supporting a level rod (8).

3. Vent cap as claimed in claim 2, characterised in that said guide (7) consists of a main central, cylindrical body (7b), wherefrom ribs (7a) for anchoring to the cup (1) depart and at whose top there are provided flexible supporting flaps (7c) carrying means of engagement (10) of the level rod.

4. Vent cap as claimed in claim 3, characterised in that said supporting flaps (7c) are two, opposite, and may be elastically spread apart.

5. Vent cap as claimed in claim 3, characterised in that each of said means of engagement (10) of the supporting flaps consists of a single tooth.

6. Vent cap as claimed in claim 3, characterised in that each of said means of engagement (10) of the supporting flaps consists of a saw-tooth surface.

7. Vent cap as claimed in claim 1, characterised in that the innermost cylindrical diaphragm (12c) of said two concentric diaphragms (12b, 12c) of said lid (12) forms a means of engagement and tightening of said supporting flaps (7c).

8. Vent cap as claimed in claim 3, characterised in that said rod (8) provides bevellings at the top thereof and recesses (9) for the engagement of said means of engagement (10) of the supporting flaps (7c).

9. Vent cap as claimed in claim 1, characterised in that said cup (1) consists of two parts, a lower part having a smaller diameter, forming a threaded spigot (4) for engagement with the equally threaded seat of the oil tank filler, and an upper part having a larger diameter, forming a chamber (5) for housing said labyrinth means.

10. Vent cap as claimed in claim 9, characterised in that between said lower and upper parts of the cup (1) there is formed an inner abutment (2a) supporting a porous filter (11).

11. Vent cap as claimed in claim 10, characterised in that said porous filter (11) is tightened against said supporting abutment (2a) by the lower edge of the outermost cylindrical diaphragm (12b) of said two concentric diaphragms (12b, 12c).

12. Vent cap as claimed in claim 10, characterised in that said cup (1) and said system (7, 7a, 7b, 7c) supporting the rod (8) are made of a single block of moulded thermoplastic material.