JPH0350377Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an improvement of a refrigerant charge hose fitting.In particular, it enables the refrigerant injection operation to be performed with a single touch, and also enables the refrigerant to be injected even when high-pressure gas is injected. This is to prevent leakage.

[Prior Art] A conventional refrigerant charge hose cap (hereinafter referred to as the cap) has a thin leaf spring-like pawl that can be operated by squeezing a lever provided on the cap, such as an air chuck used when injecting air into a tire. is pressed against and separated from the male thread of the valve stem of the inlet, and the spring force of this claw is used to hold the inlet, and the flare nut provided at the tip of the mouthpiece is attached to the valve stem of the inlet. There were two types that screwed into the male thread of the stem. Among these, the former is easy to wear but has low pressure resistance.
On the other hand, the latter had excellent pressure resistance but poor workability.

[Problems to be solved by the invention] The invention provides a mouthpiece that can hold the injection port with one touch when injecting refrigerant, and that can reliably inject refrigerant without the mouthpiece coming off from the injection port even under high pressure. The purpose is to obtain.

[Means for Solving the Problems] The present invention provides a refrigerant charge hose base in which an inner cylinder 1 having a deflator 9 inside the outer cylinder 10 is airtightly fixed via a packing 15. A groove 16 communicating with the hole 12 of the base is provided a little below the tip, and a substantially square-shaped pawl 21 integrally provided at the tip of the lever 20 is inserted into the groove 1.
6, so that a female thread 23 formed inside the tip of the claw and a male thread on the outer periphery of a valve stem 25 constituting the injection port 24 are engaged.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. In Figures 1 and 2, the inner cylinder 1 has a female thread 2 at the lower end.
, and a hole 3 is provided in the inner part thereof.

A stepped hole 4 whose diameter is successively smaller is provided from the upper end of the inner cylinder 1, and the hole 4 and the hole 3 communicate with each other through a through hole 5 at a position offset from the axis. Further, a male thread 6 is provided on the lower outer peripheral surface of the inner cylinder 1.

In the stepped hole 4 formed at the upper end of the inner cylinder 1,
A compression spring 7 and a deflator 9, which has a circular seat 8 in the middle and has an air supply/exhaust function, are successively inserted.

The outer cylinder 10 forms an inward shoulder 11 at the upper side,
The center part has a hole 1 into which the injection port 24 is inserted from above.
2, and a female thread 13 is provided on the lower inner surface, the inner part of which is a space 14 into which the inner cylinder 1 is inserted. As shown in FIG. 1, a packing 15 is inserted into the lower surface of the shoulder 11, and the inner cylinder 1 equipped with the compression spring 7 and the deflator 9 is inserted into the outer cylinder 10 from below and screwed into the outer cylinder 10. Both are airtightly fixed.

Further, above the shoulder of the outer cylinder 10, grooves 16, 16 reaching the hole 12 of the injection port are provided axially symmetrically by slotting from both sides.

Further, a triangular protrusion 17 is provided on the upper side surface of the outer cylinder 10 and protrudes laterally symmetrically, and a hole into which a pin 22 is fitted is provided in this protrusion. A compression spring 19 is fixed to. This compression spring 19 is for constantly expanding the lower end of a lever 20, which will be described later, outward.

The upper parts of the levers 20, 20 are rotatably attached to the holes of the projections 17 by pins 22, and two claws 21 formed in a substantially shape are provided on the upper outer sides of both levers to bend the claws. They are integrally fixed by welding so that their tips are facing each other.

Further, a female thread 23 of the same pitch as the male thread provided on the outer peripheral surface of the valve stem 25 is provided at the bent tip above the claw 21 formed in the substantially square shape, and the claw having this female thread 23 is provided. The part is fitted into the groove 16, and when the inlet 24 is fitted from above the inner cylinder 1, it engages with the male thread of the valve stem 25 from both sides and is clamped. . Note that 26 is a valve core provided inside the injection port 24.

[Function] Lever 20, 2 of the cap configured as above
By grasping the claw 2, the pin 22 is used as a fulcrum.
1 opens outward as shown by the two-dot chain line in FIG. The claw 21 is closed by the compression spring 19 as shown in FIG. 1, and the male thread of the injection port 24 and the female thread 23 provided at the tip of the claw mesh and engage.

By slightly turning the cap from this state, the screw effect of the pawl is exerted and the cap is firmly held in the injection port.

At this time, the inner circumferential wall at the tip of the inlet 24 pushes the upper end protrusion of the deflator 9, so that the deflator moves downward as shown in FIG. At the same time as the flow path from the through hole 5 to the upper hole 4 is opened, the shaft end of the valve core 26 installed inside the inlet at the center of the upper end of the deflator 9 is pushed upward, so that a flow path is created inside the inlet by passing the valve core. be opened. Note that the tip of the injection port and the cap are kept airtight by a gasket 15.

[Effects of the invention] As described above, in the mouthpiece of the present invention, the female thread 23 formed at the tip of the substantially square-shaped pawl 21 provided integrally with the lever 20 engages with the male thread on the outer periphery of the inlet, and Since the nozzle and the injection port 24 are firmly and airtightly fixed by just turning the nozzle a little, the inlet can be held with one touch when injecting refrigerant, and the refrigerant can be injected in a stable state even under high pressure. .

[Brief explanation of drawings]

FIG. 1 is a half-longitudinal cross-sectional view showing one embodiment of the present invention;
FIG. 2 is an exploded half-longitudinal sectional view showing the components of the present invention, and FIG. 3 is a top view of the present invention. 1 is the inner cylinder, 9 is the deflator, 10 is the outer cylinder, 1
1 is a shoulder, 12 is a hole, 15 is a gasket, 16 is a groove, 19 is a compression spring, 20 is a lever, 21 is a claw,
23 is a female thread, 24 is an injection port, 25 is a valve stem, and 26 is a valve core.

Claims (1)

[Scope of utility model registration request] A spring 7 and a deflator 9 having an air supply/exhaust function are sequentially inserted into the upper opening of the inner cylinder 1, and the inner cylinder 1 is inserted into the outer cylinder 10 from below, and both are fixed with screws. In a refrigerant charge hose fitting in which a refrigerant inlet 24 can be inserted into a hole 12 at the upper end of the refrigerant hose 10, a groove 16 reaching the hole 12 is slotted in the outer periphery of the outer cylinder 10 where the hole 12 is located. Therefore, it is provided axially symmetrically, and on the other hand, on the outer side of the outer cylinder, a substantially square-shaped claw 21 having a female thread 23 of the same pitch as the male thread formed on the outer periphery of the injection port is provided at the tip. Two levers 20, which are fixed at their tips with their threaded surfaces facing each other, are rotatably provided on the upper outer side of the outer cylinder using pins 22, and a compression spring 19 is installed below the levers between them and the outer cylinder. For refrigerant use, the tip of the claw 21 normally fits into the hole 12 into which the injection port 24 is inserted, and the tip of the claw 21 opens outward when the lever is squeezed. Charge hose mouthpiece.