Hose coupling for a faucet
BACKGROUND OF THE INVENTION 
     The present invention relates to an improved hose coupling for use with a faucet. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a hose coupling which incorporates a valve which automatically closes to shut off the water supply if the hose should be folded or flattened out resulting in an abnormal increase in water pressure in the hose. 
     It is another object of the present invention to provide a hose coupling in which said valve automatically opens to resume the water supply when the water pressure in the hose returns to a normal level. 
     With these objects in view, the invention will become apparent from the following detailed description, which will be more clearly understood in connection with the accompanying drawings, in which: 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a partially cutaway side view of one embodiment of the present invention; 
     FIG. 2 is a front view thereof; and 
     FIG. 3 is a partially cutaway side elevation of a portion of another embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now to FIGS. 1 and 2, a hose coupling, in accordance with the present invention, includes an upper body A which can be connected to a faucet, and a lower body B which is slidably mounted on the lower part of the upper body A. 
     The upper body A includes a funnel-shaped main part 1, a cap nut 2 which is screwed onto the main part 1. A narrow portion 10 is provided below the main part 1 and is in communication therewith. The narrow portion 10 is adapted for allowing the lower body B to slide thereon, and a piece of comparatively thick packing 3 is interposed between the main part 1 and the cap nut 2 and has a hole 4 in the center thereof. Three thumbscrews 5 project inwardly through the cap nut 2 in a manner such that their axes intersect at a point which lies on the axis of the cap nut 2. The main part 1 has a partition wall 7 which extends transversely and has a hole 6 for allowing the water to pass therethrough. A valve chest 8 is located between the partition wall 7 and the upper end of the narrow portion 10. A packing ring 11 is mounted on the upper brim of the narrow portion 10 and serves as a valve seat on which a steel ball valve 9 fits. A downwardly extending sleeve 23 is provided which is concentric with the narrow portion 10 on the under surface of the base plate of the main part 1. 
     The lower body B includes a main tubular part 12 and a ring nut 13 which fits on the lower half of the main part 12. The main part 12 and the ring nut 13 have lower portions 12a and 13a which are tapered toward their lower ends. The main part 12 further includes an upper portion 12b, which is adapted to fit slidably on the narrow portion 10. The upper body A and lower body B are constantly urged toward each other by a tension coil spring 19. 
     A partition wall 17 extends transversely from the inner wall of the main part 12. A hole 16 is provided in the partition wall 17 at one end thereof for allowing the water to pass therethrough. An upright rod 18 having a diameter which is smaller than the diameter of the valve seat 11, extends upward from the partition wall 17 and is concentric to the upper portion 12b of the main part 12, and has a length such that, when the lower body B is at the upper limit, the rod 18 slightly projects beyond the valve seat 11 and pushes the ball valve 9 upward. 
     Referring now to FIG. 3, a compression coil spring 19a may be used in place of the tension coil spring 19. In this embodiment, the inside diameter of the upper portion 12b of the main part 12 is slightly larger than the outside diameter of the narrow portion 10 so as to permit interposition of a sleeve 21. The lower end of the sleeve 21 has a male threaded portion 20 which fits into the upper portion 12b of the main part 12. The sleeve 21 is telescopically received within another sleeve 24. The sleeve 24 is screwed on the sleeve 23, and the compression coil spring 19a is held between an outward flange 22 which is located at the upper end of the sleeve 21 and an inward flange 25 which is located at the lower end of the sleeve 24. 
     Referring again to FIGS. 1 and 2, the connection between the upper body A and the lower body B is kept watertight by means of pressure-resisting bellows 26. The upper end of the bellows 26 is secured to the outer surface of the main part 1 of the upper body A by means of a ring 28a, while the lower end thereof is secured to the outer surface of the main part 12 of the lower body B by means of a ring 28b. The space between the bellows 26 and the tubular wall of the upper portion 12b of the lower body B communicates with the inside of the lower body B by means of a hole 27. 
     In order to mount the hose coupling on a faucet, the tip of the faucet is inserted into the hole 4 and the packing 3 only moderately pressed down by the cap nut 2. The thumbscrews 5 are then turned and driven inwards so that the upper body A is tightly secured to the faucet. Thereafter, the packing 3 spreads sideways when it is pressed hard as a result of tightening the threads between the main part 1 and the cap nut 2. As a result, the packing 3 comes into watertight contact with the external surface of the faucet. A concave surface 29 which is located on the top of the cap nut 2 is placed against the under surface of the horizontal portion of the faucet when the vertical portion thereof is too short to allow its tip to come into watertight contact with the packing 3. 
     In order to connect a hose 14 to the hose coupling, the hose end is inserted into the opening between the lower end portion 12a of the main part 12 and the lower end portion 13a of the ring nut 13. The size of the opening is then decreased by tightening the ring nut 13 so that the ring-shaped projections 15, which are located in tiers on the external surface of the lower end portion 12a of the main part 12, bite into the internal surface of the hose 14 for tightly holding the end of the hose 14 with the hose coupling. 
     As long as the water pressure in the hose 14 is normal, the bellows 26 remain in a deflated condition and the lower body B is held at the upper limit of its range of travel by the tension of the coil spring 19. Accordingly the ball valve 9 remains open and the water is discharged through the hose tip. 
     If the hose is folded or flattened out so that the water pressure in the hose increases, the water pressure in the bellows 26 also increases and causes the bellows 26 to expand and force the lower body B down against the tension of the coil spring 19. As a result the rod 18 is retracted to allow the ball valve 9 to fit onto the valve seat 11, for cutting off the water supply. 
     When the cause of pressure increase is removed and the water pressure in the hose returns to normal, the water pressure in the bellows 26 also returns to normal and the tension of the coil spring 19 causes lower body B and upper body A to move toward each other. As a result the lower body B is raised and allows the rod 18 to project slightly upward beyond the valve seat 11 and forces up the ball valve 9. Thus the water supply is automatically resumed. 
     An advantage of the hose coupling of the present invention is that the bursting of the hose can be prevented by the automatic cutting off of water supply at the time of the accidental pressure increase in the hose. 
     Another advantage is that the hose coupling of the present invention allows the temporary interruption of water supply simply by folding or trampling down on the hose and thus, permits resumption of water supply by simply by straightening out the hose or removing the foot from the hose. 
     While several embodiments of the present invention have been disclosed, it is to be understood that they are described by way of example only and not in a limiting sense, the scope of the present invention is determined by the following claims.