JP2001227660A - Air supply device for bicycle tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air supply device for a bicycle tube prevented from the looseness of a cap for pressing a mouthpiece and the formation of a clearance between the tapered face of a valve rubber and the tapered face of the inner surface of a hollow screw shaft even with the permanent set of the valve rubber due to long-term use. SOLUTION: This air supply device comprises the hollow screw shaft 3 erectly provided at the bicycle tube 1, with a fixing nut 2 thread-fastened thereto; a mouthpiece 6 fitted into the hollow screw shaft 3, with the valve rubber 5 fitted to the outer periphery of the air supply port 4; and the cap 7 externally fitted and thread-fastened to the upper part of the hollow screw shaft 3 while inserting and guiding the upper part of the mouthpiece 6. A coil spring 8 serving as an elastic member is fitted to the outside of the upper part of the mouthpiece 6, and the upper end of the coil spring 8 is engagedly fitted to the upper part inner surface of the cap 7, while the lower end is seated on the upper end of a whirl-stop seat 11 engaged with a pair of opposed vertical grooves 10 vertically provided on the peripheral surface of the mouthpiece 6 from the upper end of the hollow screw shaft 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of supplying air to a bicycle tube.

[0002]

2. Description of the Related Art Conventional air supply technology to a bicycle tube is based on a hollow screw shaft in which a base with a rubber cap is externally fitted to a hollow screw shaft which is erected on the tube. When the cap is loosened or the rubber cap is loosened, a gap is formed between the tapered surface of the rubber cap and the inner surface of the hollow screw shaft, and there is a defect that air in the tube leaks.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned air supply technology, the present invention does not loosen a cap for pressing a base.
Moreover, the present invention provides an air supply device for a bicycle tube in which a gap does not appear between the tapered portion of the rubber mouth and the tapered surface of the inner surface of the hollow screw shaft even if the rubber rubber is settled by long-term use. .

[0004]

According to the first aspect of the present invention, there is provided an apparatus for supplying air to a bicycle tube.
A hollow screw shaft into which a fixing nut is screwed, a cap which is internally fitted to the hollow screw shaft and a rubber cap is externally fitted to the air supply port, and an upper portion of the mouthpiece is inserted and guided to guide the upper portion of the hollow screw shaft. In an air supply device comprising an externally fitted cap, an elastic member is externally fitted to the upper part of the base, the upper end of the elastic member is engaged with the inner surface of the upper part of the cap, and the lower end is vertically attached to the peripheral surface of the base. And is seated on the upper end of a detent seat that engages with a pair of opposed vertical grooves dug from the upper end of the hollow screw shaft. Further, an air supply device for a tube of a bicycle according to a second invention is the air supply device according to the first invention, wherein the elastic member comprises a coil spring.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An elastic member which fits over an upper part of a base is a coil spring, an O-ring, or another elastic body which expresses elastic force as long as it does not interfere with the upper end of a hollow screw shaft.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described by way of an embodiment. As shown in FIG.
A screw 6 which is screwed into the hollow screw shaft 3, a cap 6 which is fitted inside the hollow screw shaft 3 and has a rubber cap 5 fitted to the air supply port 4, and a hollow screw which is guided through the upper part of the cap 6. In the air supply measure consisting of a cap 7 screwed onto the upper part of the shaft 3,
As shown in FIG. 2, a coil spring 8 is externally fitted to the upper part of the base 6, and an upper end of the coil spring 8 is placed on a cap 7 via a seat 9 seated on the coil spring 8.
And the lower end of the coil spring 8 is
It is vertically mounted on the peripheral surface of the base 6 and is seated on the upper end of a detent seat 11 which engages with a pair of opposed vertical grooves 10 dug from the upper end of the hollow screw shaft 3.

The apparatus for supplying air to the tube of a bicycle constructed as described above is inserted into the tire of the bicycle, and the hollow screw shaft 3 is fixed to the rim by the fixing nut 2 for use. The air from the air supply port 4 of the base 6 expands the rubber cap 5 and supplies the air to the inside of the tube 1. During running, the rubber cap 5 blocks outflow of the air so as not to flow backward from the tube 1 to the outside. It is. Therefore, the mouth rubber 5 becomes slightly sagged after long-term use. At this time, the coil spring 8 is
Since the base 6 is pressed through the base 1, the pressing force always acts on the rubber base 5 which is fitted to and adheres to the base 6, and the hollow screw shaft 3 is pressed.
Keeps in close contact with the inner tapered surface, and no gap is developed. Also, the resilient force of the coil spring 8 acts on the threaded screw surface between the cap 7 and the hollow screw shaft 3 via the cap 7, so that the cap 7 itself is prevented from loosening due to vibrations during traveling, and the like. The loosening of the base 6 is also eliminated.
Thus, air leakage in the tube 1 can be eliminated with a very simple structure.

Next, a description will be given of an apparatus for supplying air to a bicycle tube b shown in FIG. 3. A hollow screw shaft 3 which stands on the bicycle tube 1 and is screwed with a fixing nut 2 is provided.
A base 6 which is internally fitted to the hollow screw shaft 3 and externally fitted with a rubber cap 5 to the air supply port 4, and an upper part of the base 6 is inserted and guided to be externally fitted to the upper part of the hollow screw shaft 3. In the air supply device including the cap 7, as shown in FIG. 4, a ring-shaped elastic body 12 having a required height is externally fitted on the base 6,
The upper end of the elastic body 12 is engaged with the upper inner surface of the cap 7 via a seat 13 seated on the elastic body 12, and the lower end of the elastic body 12 is vertically provided on the peripheral surface of the base 6. It is seated on the upper end of a detent seat 11 that engages with a pair of opposed vertical grooves 10 dug from the upper end of the hollow screw shaft 3. Therefore, this cap also prevents the cap 7 from being loosened by the elastic force of the elastic body 12 and follows the set of the rubber cap 5 so that the tapered portion of the rubber cap 5 is tapered on the inner surface of the hollow screw shaft 3. Therefore, air leakage is eliminated without generating a gap. In the present invention, since it is necessary that the base 6 is pressed by the resilient force via the detent seat 11, the lower end of the detent seat 11 contacts the hollow screw shaft 3 and the resilient force is reduced. The depth of the vertical groove 10 dug in the hollow screw shaft 3 is appropriately selected so as not to interfere with the hollow screw shaft 3 and be transmitted to the base 6.

[0009]

As described above, according to the present invention, the cap is prevented from being loosened by the elastic force of the elastic member, and the rubber cap is pressed by the elastic force even if the rubber cap is set. The tapered portion is pressed against the tapered surface of the inner surface of the hollow screw shaft so that no gap is produced. Therefore, there is no air leakage even when used for a long time, airtightness is always maintained, and traveling safety is secured. There is.

[Brief description of the drawings]

FIG. 1 is an explanatory view in which a part of a device for supplying air to a tube of a bicycle according to the present invention is partially cut away.

FIG. 2 is an enlarged longitudinal sectional view of a main part of the present invention shown in FIG.

FIG. 3 is an explanatory view in which a part of an apparatus b for supplying air to a tube of a bicycle according to the present invention is cut away.

FIG. 4 is an enlarged longitudinal sectional view of a main part of the present invention shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube 2 Fixing nut 3 Hollow screw shaft 4 Air supply port 5 Rubber rubber 6 Cap 7 Cap 8 Coil spring 9 Seat 10 Vertical groove 11 Detent seat 12 Elastic body 13 Seat a Air supply device for bicycle tube b Bicycle Air supply to tube

Claims (2)

[Claims] 1. A hollow screw shaft which is erected on a bicycle tube and screwed with a fixing nut, a base which is internally fitted to the hollow screw shaft and a rubber band is externally fitted to an air supply port, and the base And a cap which is inserted into and guided by the upper part of the hollow screw shaft and screwed onto the upper part of the hollow screw shaft. Air to the bicycle tube, the lower end of which is mounted vertically on the peripheral surface of the base and seated on the upper end of a detent seat which engages with a pair of opposed vertical grooves dug from the upper end of the hollow screw shaft. Feeding device. 2. An apparatus for supplying air to a tube of a bicycle according to claim 1, wherein the elastic member comprises a coil spring.