Patent Application
20090283083
1. Field of the Invention
This invention relates to a valve change-over device, particularly to one able to be installed in a paint-pellet gun or an automatic machine for enabling the paint-pellet gun to elevate the probability of hitting a target or enhancing the working efficiency of the automatic machine.
2. Description of the Prior Art
The striking control device of a conventional paint-pellet gun, as shown in
However, air is controlled by the electromagnetic valve 7 to get into and get out of the gun body 1 through only one air intake, and thus air cannot quickly be exhausted out and led in and the phase of the valve body 7 cannot be changed fast, rendering paint pellets apt to be struck in vain in its continuous striking movement and lowering the probability of hitting a target.
The objective of this invention is to offer a valve change-over device including a motor-driving unit having its front end provided with a spindle extending outward and having one side eccentrically and pivotally disposed thereon with a pushing wheel. A sleeve to be fitted on the spindle has at least one side wall axially bored with an elongate guide slot. A pushing rod to be received in the interior of the sleeve has its side wall fixed with a position-limiting member at a location corresponding with the guide slot of the sleeve to enable the pushing rod to restrictedly and slidably shift in the guide open slot. Further, the pushing rod has its rear end formed with a cam surface for resisting against the pushing wheel of the spindle of the motor driving unit. A valve body has a valve rod axially inserted in the interior to be rotated together with the pushing rod for controlling opening and closing of the through holes of the valve body to let air flow in and out and control air flowing directions. The spindle of the motor-driving unit is rotated to actuate the sleeve to shift and the pushing rod to move restrictedly in the guide slot of the sleeve, able to quickly change the phase and elevate the working efficiency of the valve body.
This invention will be better understood by referring to the accompanying drawings, wherein:
A preferred embodiment of a valve change-over device in the present invention, as shown in
The motor driving unit 10 has its front end provided with a spindle 11 extending outward and having one side eccentrically and pivotally disposed with a push wheel 12.
The sleeve 20 is a hollow cylinder to be fitted around the spindle 11 of the motor-driving unit 10 and has its opposite side walls respectively and axially bored with a symmetric guide slot 21, which is elongate and oval.
The pushing rod 30 to be received in the sleeve 20 has its opposite side walls respectively fixed with a round position-limiting block 31 protruding outward at a location corresponding with the guide slots 21 of the sleeve 20 so that the pushing rod 30 can be actuated by the guide slots 21 to axially shift and be restricted in position. Further, the pushing rod 30 has its rear end aligned to the pushing wheel 12 of the motor-driving unit 10 and provided with a cam surface 32 for resisting against the pushing wheel 12.
The valve body 40 to be positioned at the front open end of the sleeve 20 has a valve rod 41 axially inserted in the interior to be moved together with the pushing rod 30. In this preferred embodiment, the valve body 40 is a five-directional valve formed with five directional through openings. The valve rod 41 has its surface fitted thereon with a first rubber ring 42 and a second rubber ring 43 spaced apart at a proper interval and corresponding with the inner wall of the valve body 40 to control opening and closing of the five directional through openings for permitting air to flow in and flow out and controlling air flowing directions thereby. The valve body 40 has its rear open end disposed with a positioning block 44, and an elastic member 45 is installed between the positioning block 44 and the valve rod 41 for actuating the pushing rod 30 to recover its original position. Furthermore, the valve body 40 has one side wall bored with three first through holes 46 spaced apart equidistantly and another side wall bored with two second through holes 47 at the locations staggering the three first through holes 46. The three first through holes 46 consist of a normally-opened air intake 46a located in the center, and a first exhaust hole 46b and a second exhaust hole 46c respectively situated at the opposite sides of the normally-opened air intake 46a, while the two second through holes 47 contain a first air intake 47a and a second air intake 47b.
In order to further understand the structural features, operative technique and expected effect, how to use this invention is to be described below.
Referring to
In using, as shown in
To sum up, the valve change-over device of this invention is to have the spindle of the motor-driving unit driven to rotate and actuate the sleeve to shift and drive the pushing rod to restrictedly shift in the guide slots of the sleeve to control opening and closing of the through holes of the valve body for allowing air to flow in and exhaust out and thereby controlling air flowing directions, able to quickly change the phase and heighten the working efficiency of the valve body. Moreover, the valve change-over device of this invention can be installed in a paint-pellet gun or an automatic machine, enabling the paint-pellet gun to carry out continuous striking comparatively fast for elevating the probability of hitting a target, and enhancing the working efficiency of the automatic machine.
While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.
