Patent Application
20110233439
1. Field of the Invention
The present invention relates to a control head, and more particularly to a gas control valve installed onto a suction device and having a structure that can be pressed or resumed to its original position smoothly.
2. Description of Related Art
With reference to
With reference to
However, the practical applications of the aforementioned two conventional gas control valves for a suction device still have the following drawbacks. Since the external surface of a piston 22, 202 of the conventional gas control valves must be attached closely with the internal sidewall of the shaft tube 11, 111 before communications with the intake tube 12, 112 and the discharge tube 13, 113 can be blocked without leaking gas under a sealed condition. To avoid a too-large frictional force between the piston 22, 202 and the internal sidewall of the shaft tube 11, 111 and prevent the moving speed of the shaft module 20, 200 from becoming slower due to a too-large resistance, a lubricant is usually applied between the piston 22, 202 and the internal sidewall of the shaft tube 11, 111 to reduce the resistance and enhance the moving speed of the shaft module 20, 200. However, such arrangement incurs higher labor and production costs. On the other hand, the manufactured piston 22, 202 may have a slight discrepancy of its external diameter. If the external diameter of the piston 22, 202 is too large, the shaft tube 11, 111 will be too tight and unable to resume its original position easily. If the external diameter of the piston 22, 202 is too small, then the piston 22, 202 will not be attached closely to the internal sidewall of the shaft tube 11, 111, and a leak may result. Obviously, the conventional gas control valves demand immediate improvements and feasible solutions.
In view of the drawbacks of the conventional gas control valves, the inventor of the present invention based on years of experience in the related industry to conduct extensive researches and experiments, and finally developed a control head in accordance with the present invention.
Therefore, it is a primary objective of the present invention to provide a control head installed on a gas control valve of a suction device, wherein the control head can be pressed down or resumed to its original position smoothly.
To achieve the foregoing objective, the present invention provides a control head comprising a valve seat, a shaft module, an elastic member and a cap, wherein the valve seat includes a shaft tube, and an intake tube and a discharge tube extended from the shaft tube respectively and interconnected with each other; the shaft module has an end passed inside the shaft tube for an operational movement and includes a moving rod, a conical piston sheathed onto a lower end of the moving rod, and an oblique surface formed separately at an internal end of the intake tube and the discharge tube and corresponding to an oblique surface of the conical piston; the elastic member is contained inside the shaft tube and both ends of the elastic member are pressed against the valve seat and a corresponding surface of the shaft module, and a cap is covered and coupled to the valve seat and at a position corresponding to the shaft module, and another end of the shaft module is passed out of the cap and coupled to a press button, such that when the oblique surface of the conical piston is moved at the shaft module, the oblique surface will not be attached closely to the internal sidewall of the shaft tube, such that a smooth downward pressing movement or a smooth resuming movement can be achieved.
The invention, as well as its many advantages, may be further understood by the following detailed description and drawings in which:
With reference to
An end of the shaft module 4 is passed inside the shaft tube 31 of the valve seat 3, and the shaft module 4 can perform an operational movement of the shaft tube 31. The shaft module 4 comprises a moving rod 41, a conical piston 42, an upper piston ring 43 and a press button 44, wherein the conical piston 42 is installed at a lower end of the moving rod 41, and an oblique surface 321, 331 is formed separately at internal ends of the intake tube 32 and the discharge tube 33 and corresponding to an oblique surface of the conical piston 42, and a circular groove 411 is formed at the middle section of the moving rod 41, and the upper piston ring 43 is sheathed onto an upper end of the moving rod 41. In addition, a cap body 412 is formed at a bottom end of the moving rod 41, and a concave hole 413 is formed at a top end of the moving rod 41 and coupled with the press button 44.
The elastic member 5 can be a conical spiral spring contained and installed inside the shaft tube 31 of the valve seat 3, and both ends of the elastic member 5 are pressed against internal side of the bottom cover 35 of the valve seat 3 and a side of the cap body 412 of the moving rod 41.
The cap 6 is covered and coupled to the valve seat 3 and at a position corresponding to the shaft module 4, such that a top end of the moving rod 41 of the shaft module 4 is passed out of the cap 6 and coupled to the press button 44. Further, the upper piston ring 43 is pressed against an internal edge of the top surface of the cap 6 for preventing the shaft module 4 from being pushed into the shaft tube 31 of the valve seat 3 by the elasticity of the elastic member 5.
With reference to
With reference to
With reference to
Many changes and modifications in the above described embodiment of the invention can, of course, be carried out without departing from the scope thereof Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.
