JPS6118207Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an L-shaped joint device for an air passage of a carburetor that is driven into the take-out end of an air passage such as an air vent passage of a carburetor or an air introduction passage of a starter.

In general, air passages such as the air vent passage of a carburetor or the air introduction passage of a starter are often bored on the side of the carburetor, and the open end of this passage is made of a rubber pipe or the like for protection and waterproofing. When piping is installed, an L-shaped joint is driven into the end of the air passage.

As shown in Fig. 1, this L-shaped joint 1 has a driven boss 2 driven into an air passage and a communication boss 3 opened to the atmosphere, which are connected in an L-shape. For driving, the outer diameter of the driving boss 2 and the inner diameter of the driving hole at the end of the air passage must be machined with high accuracy, and the outer diameter of the boss at the end of the air passage must be made sufficiently large for driving. This required an additional driving process.

In view of the above, the present invention is made by manufacturing an L-shaped joint as a molded product made of resin material, and pressing and fitting the fitting boss of this L-shaped joint onto the outer periphery of the end boss of the air passage. The L-shaped joint is attached to the air passage with the L-shaped joint, making it extremely easy to manufacture the L-shaped joint, and the L-shaped joint can be attached to the end boss of the air passage very easily and reliably. It is an object of the present invention to provide an L-shaped joint device for a passageway.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

Reference numeral 10 denotes a carburetor main body through which an intake passage 11 passes, and a float chamber 13 is formed by a floating chamber body 12 disposed at the lower part of the carburetor main body. A constant liquid level XX is formed in the float chamber 13 by a float, a float valve, and a float valve seat (all not shown), and an upper liquid level chamber 13A is formed in the float chamber 13 above the liquid level. An air passage 14 as an air vent passage opening from the upper liquid level chamber 13A to the atmosphere is bored, and this air passage 1
4 is an air passage boss 15 on the side of the carburetor main body 10.
stands out as Further, a detent groove 17 is formed on the outer peripheral surface of the air passage boss 15 and opens to the end face 15A of the air passage boss 15 and runs along the longitudinal direction of the boss 15. One annular retaining groove 16 on the main body 10 side
is drilled.

18 is an L-shaped joint integrally molded from a synthetic resin material such as plastic, and is connected to the air passage boss 15.
A fitting boss 19 fitted into the outer periphery of the air passage boss 19 and a communication boss 20 opened to the atmosphere are integrally connected at opposing ends, and an air passage boss 15 is fitted into the fitting boss 19. A fitting hole 21 is formed, and on the inner peripheral surface of the fitting hole 21, one annular retaining protrusion 22 that is engaged in the retaining groove 16 and one circumferential retaining projection 22 that is engaged in the retaining groove 17 are formed. Stop protrusion 23
and is provided. The locking projection 23 is integrally continuous with the inner end surface 21a of the fitting hole 21, and the locking projection 22 is located further outward in the axial direction of the fitting hole 21 than the locking projection 23. The communication boss 20 is provided with a ventilation hole 24 whose one end is connected to the insertion hole 21 and whose other end is open to the atmosphere.
Note that 25 is a rubber pipe attached to the communication boss 20.

In the above structure, in order to attach the L-shaped joint 18 to the air passage boss 15 of the carburetor main body 10,
The boss 1 fits into the anti-rotation groove 17 of the air passage boss 15.
After aligning the locking protrusions 23 of 9, the fitting boss 1
9 into the insertion hole 21, this insertion boss 1
9 Push in the top. At this time, since the retaining protrusion 22 is molded integrally with the fitting boss 19 from synthetic resin, its inner diameter is enlarged and movement on the fitting boss 19 is permitted. When the retaining protrusion 22 is fitted into the retaining groove 16, the diameter of the retaining protrusion 22 is reduced, so that the fitting boss 19 is firmly fixed to the air passage boss 15, preventing the L-shaped joint 18 from coming off. definitely prevent it. On the other hand, since the anti-rotation protrusion 23 enters the anti-rotation groove 17 of the fitting boss 19, rotation of the L-shaped joint 18 is reliably prevented.

As described above, according to the present invention, there is a fitting hole 2 at one end.
A connecting boss 20 that is open to the atmosphere is integrally connected to the other end of the fitting boss 19 with the fitting hole 1 opened, thereby forming an L-shaped joint 18 made of synthetic resin.
On the inner circumferential surface of the fitting hole 21, there is provided a locking projection 23 that is integrally connected to the inner end surface 21a of the fitting hole 21, and an annular retainer located further outward in the axial direction of the fitting hole 21 than the locking projection 23. The end surface 15 of the air passage boss 15 is provided on the outer peripheral surface of the air passage boss 15 protruding from the carburetor main body 10.
One anti-rotation groove 17 opening at A and an annular anti-slip groove 16 located closer to the carburetor main body 10 than the anti-rotation groove 17 are formed, and the fitting boss 19
At the same time, the air passage boss 15 is fitted into the fitting hole 21 of
In addition, by engaging the detent projections 23 with the detent grooves 17, the L-shaped joint 1
8 is attached to the carburetor main body 10, the engagement of the annular retaining protrusion 22 with the groove 16 causes the outer peripheral surface of the air passage boss 15 to fit into the fitting hole 2 of the fitting boss 19.
1 inner circumferential surfaces can be firmly connected in the axial direction over their entire circumferences, and the L-shaped joint 18 will not inadvertently come out from the air passage boss 15 of the carburetor main body 10. In addition, the locking groove 17 and the protrusion 23, which are formed on the outer circumferential surface of the air passage boss 15 and the inner circumferential surface of the fitting hole 21 of the fitting boss 19 and engage with each other, are each formed on these surfaces to prevent them from rotating. However, since the anti-rotation protrusion 23 is integrally connected to the inner end surface 21a of the insertion hole 21 and provides high support rigidity for the protrusion 23, the protrusion 23 itself cannot be damaged or deformed. It is possible to reliably achieve the above-mentioned anti-rotation effect. The outer peripheral surface of the air passage boss 15 and the inner peripheral surface of the fitting hole 21 of the fitting boss 19 are provided with an annular retaining groove 16 and a protrusion 22, which are extremely easy to process.
and the only pair of anti-rotation grooves 17 that are also easy to machine.
and protrusion 23, the grooves and protrusions have good machinability as a whole, even though the grooves and protrusions have the functions of preventing slippage and rotation prevention. This can contribute to cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional L-shaped joint 18, Figs. 2, 3, and 4 show an embodiment of the present invention, Fig. 2 is a longitudinal sectional side view, and Fig. 3 is a longitudinal sectional view. 2
FIG. 4 is a vertical cross-sectional view showing only the L-shaped joint in the figure, and FIG. 4 is a vertical cross-sectional side view taken along the line -- in FIG. 10... Carburetor body, 15... Air passage boss,
16... Preventing groove, 17... Preventing groove, 18
...L-shaped joint, 19...Mating boss, 20...
...Communication boss, 21... Fitting hole, 22... Stopping protrusion, 23... Stopping protrusion.

Claims (1)

[Scope of utility model registration request] An L-shaped joint 18 made of synthetic resin is constructed by integrally connecting a connecting boss 20 opened to the atmosphere at the other end of a fitting boss 19 with a fitting hole 21 opened at one end, and forming an L-shaped joint 18 made of synthetic resin. The fitting hole 21 is provided on the circumferential surface.
One anti-rotation protrusion 23 integrally continuous with the inner end surface 21a of the inserting hole 21, and an annular anti-removal protrusion 22 located further outward in the axial direction of the fitting hole 21 than the anti-rotation protrusion 23 are integrally provided. Vaporizer body 10
On the outer circumferential surface of the more protruding air passage boss 15, there is a detent groove 17 that opens to the end surface 15A of the boss 15, and a detent groove 17 that extends further into the carburetor body 1 from the detent groove 17.
An annular retaining groove 16 located on the 0 side is formed, and the air passage boss 15 is fitted into the fitting hole 21 of the fitting boss 19, and the retaining protrusion 22 is inserted into the retaining groove 16, and a rotation preventive groove is formed. Protrusion 23
An L-shaped joint device for an air passage of a carburetor, in which the L-shaped joint 18 is attached to the carburetor main body 10 by engaging with the anti-rotation grooves 17, respectively.