JPH0516467Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to an improvement of an intake and exhaust valve for a rubber boat with a safety valve function.

<Prior art> A conventional intake and exhaust valve for a rubber boat is disclosed in Utility Application No. 7, filed in U.S. Pat. No. 59-185625, filed by the applicant.
There is one shown in the figure.

The intake/exhaust valve A shown in FIG. 7 is installed on the skin of the air cylinder 6 via a rubber collar 5, and is fitted with a packing 9 made of an O-ring attached to the back side of the grip 2d of the rotary valve body 2. Opening edge 1c of valve seat 1 recess
This prevents the air inside the air cylinder 6 from flowing out to the outside.

However, since the rotary valve body 2 is operated after the air cylinder 6 is filled with air, the back surface of the grip part 2d, which the upper surface of the gasket 9 comes into contact with, rotates, causing the attached gasket 9 to twist or shift. Therefore, the packing 9 may close the opening edge 1c of the valve seat 1.
There was a risk that the air inside the air cylinder 6 would leak out because the air cylinder 6 did not come into close contact with the air cylinder 6.

<Problem to be solved by the invention> The problem to be solved by the invention is to prevent the packing from slipping or twisting.

<Technical means for solving the problem> The technical means taken by the present invention to solve the above-mentioned problem is to open an air inlet/outlet that communicates the inside of the air cylinder with the outside in the recess in the center of the outside side. a rotary valve seat, and a rotary valve body seated in a recessed portion of the valve seat so as to be able to rotate and move forward and backward while being pressed by an anti-pressure spring; An inlet hole is opened that matches the air inlet and outlet of the valve seat in the moving position, and a flange-like grip is formed around the outer periphery of the rotating valve body, and a recess in the valve seat faces the back surface of the grip. A protrusion is formed along the edge of the opening that comes into close contact with the back surface of the grip, and either the surface of the protrusion or the back surface of the grip is integrally covered with a synthetic rubber gasket.

<Operation> The seal is fixed in close contact with the surface of the protrusion formed on the opening edge of the recess of the valve seat or the back surface of the grip.

The rotary valve body is seated in the recess of the valve seat by an anti-pressure spring so that it can rotate and move forward and backward while being pressed by a predetermined force, and rotates when the pressure inside the air cylinder exceeds a predetermined pressure. A gap is formed in the valve seat recess to communicate with the outside, and the air inside the air cylinder is exhausted to the outside.

In addition, when the pressure inside the air cylinder is below a predetermined pressure, the synthetic rubber gasket provided between the surface of the protrusion provided on the opening edge of the valve seat recess and the back surface of the grip of the rotary valve body moves to one side. It is fixed and securely in close contact with the valve seat, and the gap formed by the valve seat recess and the rotating valve body and communicating with the inside of the air cylinder is completely cut off from the outside of the air cylinder.

<Effects> As described above, the present invention forms a ring-shaped protrusion on the opening edge of the valve seat recess, and also forms a ring-shaped protrusion on the surface of this protrusion, the back surface of the grip of the rotating valve body, or the opening edge of the valve seat recess. Since Pitsukin is integrally coated on either the surface of the protrusion, it is fixed to the back surface of the grip or the surface of the protrusion of the protrusion, and rotates the rotating valve body when the pressure inside the air cylinder is below a predetermined pressure. Even if the valve seat moves, the gasket is fixed to the contact area of either the surface of the protrusion formed on the opening edge of the valve seat recess or the back surface of the rotating valve body, ensuring a secure fit without twisting or shifting. However, there is no risk of the air inside the pneumatic cylinder leaking out to the outside.

Furthermore, since the seal is integrally formed on either the surface of the protrusion or the back surface of the grip, there is no need for an independent seal and the number of parts can be reduced.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

Reference numeral A in FIG. 1 indicates an intake and exhaust valve attached to the air cylinder 6, which is embedded and fixed in the skin of the air cylinder 6 via a rubber collar 5.

This intake/exhaust valve A consists of a safety valve part a and an intake port part b which is detachably provided in a rotary valve body 2 which is a valve body of the safety valve part a.

The valve seat 1 of the safety valve part a also serves as the valve seat 1 of the main intake/exhaust valve A itself, and is formed into a circular plane and is fixed to the bottom of the rubber flange 5 described above while maintaining an airtight joint surface.

The seat surface 1b of the valve seat 1 on which the rotating valve body 2 is seated is provided on the outside side of the air cylinder 6 of the valve seat 1, and a recessed portion is formed in the center of the outside side of the valve seat 1, and the bottom end of the recessed portion is formed at the center of the outside side of the valve seat 1. It is provided so as to be inclined in a conical shape from the periphery toward the inside of the air cylinder, and has four air inlet/outlet ports 1a which communicate the inside of the air cylinder 6 with the outside. Also, the same seat surface 1b
A guide shaft 7 for inserting and holding the rotary valve body 2 is provided in the center to protrude toward the outside of the air cylinder 6, and a protrusion 1 is provided along the opening edge 1c of the concave portion of the valve seat 1.
d.

The protrusion 1d is formed in a flush manner along the opening edge 1c of the concave portion of the valve seat 1, facing the back surface of the grip portion 2d of the rotary valve body 2, and the seal 9 is integrally formed on the surface of the protrusion. It was established.

The packing 9 is formed into a ring shape of a desired size using a synthetic rubber material, and is integrally attached to the valve seat 1 by covering the protrusion 1d.

The rotary valve body 2 is formed into a substantially cylindrical shape, and a seating surface 2b is provided at one end of the rotary valve body 2 to be seated in close contact with the seating surface 1b. A hole 2a is provided, a fitting hole 2c for fitting the guide shaft 7 is formed in the center thereof, and a grip portion 2d is provided around the outer peripheral surface of the other end.

The grip portion 2d is formed in the shape of a brim to a desired size that makes it easy to operate the rotary valve body 2, and its outer periphery is formed in a skirt shape, and is integrally formed on the outer periphery of the rotary valve body 2d. When the internal pressure of the air cylinder 6 exceeds a predetermined value, the back surface of the rotary valve body 2 is designed to receive sufficient air pressure that escapes from the gap between the concave portions, so that the rotary valve body 2 operates smoothly.

To attach the rotary valve body 2 to the valve seat 1, the rotary valve body 2 is fitted onto the guide shaft 7 of the valve seat 1 and seated on the seat surface 1b in the recess of the valve seat 1, and then a predetermined spring force is applied. The anti-pressure spring 4 is fitted into the guide shaft 7, compressed and attached with a bolt 8 passing through the guide shaft 7, and the rotary valve body 2 is pressed against the seat surface 1b with a predetermined pressure.

As a result, the rotary valve body 2 is held by the guide shaft 7 while being subjected to a pressing force by the anti-pressure spring 4, so that it can freely move forward and backward and rotate.

Therefore, under normal conditions, the air inlet/outlet 1 of the valve seat 1
a is opened at the seating surface 2b of the rotary valve body 2, and a gasket 9 formed to cover the surface of the protrusion 1d provided at the opening edge 1c of the concave portion of the valve seat 1 is in close contact with the back surface of the grip portion 2d, and the valve is closed. The gap formed by the recessed portion of the seat 1 and the rotary valve body 2 and communicating with the inside of the air cylinder 6 is reliably isolated from the outside and completely prevents the air inside the air cylinder 6 from flowing out to the outside. .

Further, as shown in the drawings, the suction port body 10 having the check valve 3 is removably screwed into the opening on the grip portion 2d side of the rotary valve body 2 in the above state.

Next, FIGS. 5 and 6 show other embodiments of the present invention.

The one shown in Fig. 5 is integrally formed by extending the upper surface of the rubber collar 5, which is fixed with the gasket 9 embedded in the surface of the air cylinder 6, and has a protrusion provided on the opening edge 1c of the concave portion of the valve seat 1. 1d, and also comes into close contact with the back surface of the grip portion 2d of the rotary valve body 2.

In the one shown in Fig. 6, the seal 9 is integrally provided by coating the back surface of the grip portion 2d of the rotary valve body 2, and is tightly attached to the surface of the protrusion 1d provided on the opening edge 1c of the recessed portion of the valve seat 1. It is something to do.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an intake and exhaust valve for a boat showing an embodiment of the present invention, Fig. 2 is a partially cutaway plan view of Fig. 1, and Fig. 3 is a longitudinal sectional view of the intake and exhaust valve in the exhaust state. , FIG. 4 is a vertical cross-sectional view of the intake and exhaust valve in the suction state, FIGS. 5 and 6 are vertical cross-sectional views showing other embodiments of the present invention, and FIG. 7 is a conventional example. In the figure, A...Intake/exhaust valve, a...Safety valve part, b...Intake port part, c...Joint part, 1...Valve seat, 1a...Air inlet/outlet, 1d...Protrusion, 2... …
Rotary valve body, 2a...Blowing hole, 2d...Grip portion, 3
...Check valve, 4...Anti-pressure spring, 6...Air cylinder, 9...Putskin.

Claims (1)

[Scope of utility model registration request] Air inlet/outlet 1 that communicates the inside and outside of the air cylinder 6
Valve seat 1 with a opened in the central recess on the outside side
and a rotary valve body 2 seated in a recessed portion of the valve seat 1 so as to be rotatable and movable back and forth while being pressed by an anti-pressure spring 4. An inlet hole 2a is formed to match the air inlet/outlet 1a of the valve seat 1 in the moving position, and a flange-like grip portion 2d is formed around the outer periphery of the rotary valve body 2, and the back surface of the grip portion 2d and A protrusion 1d is formed around the opposing recess opening edge 1c of the valve seat 1 in close contact with the back surface of the grip, and on either the surface of the protrusion 1d or the back surface of the grip 2d, This intake/exhaust valve for boats is formed by integrally covering a flat rubber packing 9.