VALVE CHANGE-OVER DEVICE

Abstract

A valve change-over device includes a motor-driving unit having a spindle fitted thereon with a sleeve having at least one side wall axially bored with a guide slot. A pushing rod received in the sleeve is fixed with a position-limiting member at a location corresponding with the guide slot of the sleeve. A valve body is installed at the front open end of the sleeve, having a valve rod axially inserted in the interior. The spindle of the motor-driving unit is rotated to actuate the pushing rod to slidably shift in the guide slots of the sleeve and control the valve rod to open and close the through holes of the valve body for permitting air to flow in and exhaust out and controlling air flowing directions, able to quickly change the phase and elevate the working efficiency of the valve body.

Description

BACKGROUND OF THE INVENTION

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 FIG. 1, includes a hollow gun body 1 having its rear lower end extended downward and formed with a gun handle 2. The gun body 1 has its front end disposed in the interior with a striking unit 3 and its rear side bored with an air intake 4, having a pushing unit 5 provided between the striking unit 3 and the air intake 4 and fitted thereon with an elastic member 6. Further, the gun handle 2 is provided therein with an electromagnetic valve 7 communicating with the air intake 4 for controlling air to flow in and out of the gun body 1. During striking, air is controlled by the electromagnetic valve 7 to get into the interior of the gun body 1 through the air intake 4 to push the pushing unit 5 to compress the elastic member 6 and strike against the striking unit 3. After striking, the elastic member 6 will recover to push the pushing unit 5 to automatically return to its original position, thus enabling paint pellets to be struck continuously according to the above-mentioned operation.

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.

SUMMARY OF THE INVENTION

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.

BRIEF DESCRIPTION OF DRAWINGS

This invention will be better understood by referring to the accompanying drawings, wherein:

FIG. 1 is a cross-sectional view of the striking control device of a conventional paint-pellet gun;

FIG. 2 is a partial exploded perspective view of a valve change-over device in the present invention;

FIG. 3 is a cross-sectional view of the valve change-over device in the present invention;

FIG. 4 is a cross-sectional view of the valve change-over device assembled in a paint-pellet gun in the present invention; and

FIG. 5 is a cross-sectional view of the valve change-over device in a using condition in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A preferred embodiment of a valve change-over device in the present invention, as shown in FIGS. 2 and 3, includes a motor-driving unit 10, a sleeve 20, a pushing rod 30 and a valve body 40 as main components combined together.

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.

FIG. 4 shows that the valve change-over device of this invention is assembled in a paint-pellet gun 50 for elevating striking effect of paint pellets (not shown) in the paint-pellet gun 50. The paint-pellet gun 50 mainly includes a hollow gun body 51 having its rear lower end extended downward and formed with a gun handle 52, and its front end bored with a main air passageway 511 having its open end installed with a gas pressure bottle 60. Further, the gun body 51 has the interior of its rear end partitioned into a pushing chamber 53 assembled therein with a pushing rod 531 having its rear end fixed with a bulging pushing block 54, with a position-recovering gap (a) formed between the outer circumference of the pushing rod 531 and the pushing chamber 53, and a pushing gap (b) formed between the rear end of the pushing block 54 and the pushing chamber 53. In addition, the gun body 51 has its lower portion formed with an elongate secondary air passageway 55 having one end communicating with the main air passageway 511. The valve change-over device is installed in the interior of the gun handle 52 at a location abutting the pushing chamber 53. The first air intake 47a of the valve body 40 communicates with the pushing gap (b), the position-recovering gap (a) communicates with the second air intake 47b, and the normally-opened air intake 46a communicates with another end of the secondary air passageway 55, which are respectively and indirectly connected with each other by means of a guide tube for mutual communicating.

Referring to FIG. 3, before striking of paint pellets, the second air intake 47b is closed by the first rubber ring 42, and high pressure gas guided into the main air passageway 511 through the normally-opened air intake 46a will be guided into the pushing gap (b) through the first air intake 47a to actuate the pushing rod 531 to move forward and force the air in the position-recovering gap (a) to flow along the second air intake 47b and be exhausted out through the second air exhaust hole 46c so as to prevent air from continuously flowing into the position-recovering gap (a). Thus, the pushing rod 531 can be pushed forward comparatively fast, and paint pellets in the paint-pellet gun 50 can fly to a farther range.

In using, as shown in FIG. 5, after striking, the motor driving unit 10 is started to drive the spindle 11 to rotate and actuate the eccentric pushing wheel 12 to resist against the cam surface 32 and push the pushing rod 30 to shift axially in the guide slots 21 of the sleeve 20 and drive the valve rod 41 to move forward and press against the elastic member 45. At this time, the first rubber ring 42 and the second rubber ring 43 are moved forward simultaneously, letting the second rubber ring 43 exactly seal up the first air intake 47a; therefore, air continuously flowing in through the normally-opened air intake 46a will be guided by the second air intake 47b to get into the position-recovering gap (a). Thus, when the valve rod 41 is driven by the elastic member 45 to recover its original position, high pressure gas can quickly be exhausted out through the first air intake 47a and the first exhaust hole 46b, thus enabling the pushing rod 531 to recover its position fast. Evidently, the valve change-over device of this invention can greatly boost the velocity of continuous striking for the paint-pellet gun 50 and hence can elevate the probability of hitting a target.

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.

Claims

1. A valve change-over device comprising:

a motor-driving unit having its front end provided with a spindle extending outward, said spindle having a pushing wheel eccentrically and pivotally disposed thereon;

a sleeve fitted on said spindle, said sleeve at least having one side wall provided with a guide slot;

a pushing rod received in said sleeve, said pushing rod fixed with a position-limiting member at a location corresponding with said guide slot of said sleeve to enable said pushing rod to restrictedly and slidably shift in said guide slot, said pushing rod having its rear end formed with a cam surface corresponding with said pushing wheel of said motor-driving unit for resisting against said pushing wheel; and

a valve body provided with a valve rod to be moved together with said pushing rod, said valve rod functioning to control positions of said valve body.

2. The valve change-over device as claimed in claim 1, wherein said valve body is assembled at a front open end of said sleeve and formed with at least three-directional through openings, said valve rod axially inserted and positioned in said valve body, said valve rod having its surface fitted thereon with at least one rubber ring contacting with an inner wall of said valve body, said rubber ring of said valve rod functioning to control opening and closing of said through holes of said valve body for permitting air to flow in and exhaust out and controlling air flowing directions, said valve rod having another end opposite to said sleeve disposed with an elastic member for actuating said pushing rod to recover its position.

3. The valve change-over device as claimed in claim 1, wherein said guide slot is elongate and oval, bored axially in one side of said sleeve, while said position-limiting member is shaped as a round block to be slidably positioned in said guide slot.