BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing aspects and many of the attendant advantages of this invention will be more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
FIG. 1 shows a structural drawing of a preferred embodiment in the present invention;
FIG. 2 shows a sectional drawing of a preferred embodiment in the present invention;
FIG. 3 shows a sectional drawing of a preferred embodiment in the present invention; and
FIG. 4 shows a sectional drawing of a valve sleeve and a cylinder in a preferred embodiment according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Please refer to FIG. 1 which shows a structural drawing of a preferred embodiment in the present invention. As shown in FIG. 1, this embodiment of the present invention includes an air tool 10 which has a handle 11 and an inlet 12 located in the lower end of the handle 11. The inlet 12 provides a pressed atmosphere into an inlet channel 13. The inlet channel 13 has a valve shelve 14 mounted thereon and also has a first inlet air way 131 and a second inlet air way 132. The valve sleeve 14 has plural through holes 141, 142, 143 mounted thereon respectively connected to the inlet channel 13 and the first and the second inlet air ways 131, 132, and the peripheral of the through holes 141, 142, 143 has a resin pad 20 for avoiding leaking. The first inlet air way 131 and the second inlet air way 132 are communicated with a cylinder 15 inside the air tool 10 and the first and the second inlet air ways 131, 132 are respectively the clockwise and the counterclockwise inlet way of the cylinder 15 so that through different inlet directions, a rotor 16 inside the cylinder 15 can be controlled/changed so as to drive a transmission shaft 17 to rotate clockwise or counterclockwise. Further, an air capacity button 18 connected with the cylinder 15 is mounted at the rear end of the air tool 10 for controlling the inlet volume so as to adjust the rotation speed of the rotor 16 and the transmission shaft 17.
A control shaft 30 is mounted inside the valve sleeve 14, and both the valve sleeve 14 and the control shaft 30 are mounted below the cylinder 15 and parallel to the cylinder 15. The control shaft 30 has a separating portion 31 whose outer diameter is equivalent to the inner diameter of the valve sleeve 14, and on the control shaft 30, an airtight ring 34 which tightly matches the inner wall of the valve sleeve 14 is provided for preventing the pressed atmosphere from leaking, and a first conducting portion 32 and a second conducting portion 33 which are respectively located at two sides of the separating portion 31 are provided for passing through the air. At the two ends of the control shaft 30, a rejecting portion 35 exposed out of the valve sleeve 14 is provided, and the rejecting portion 35 is penetrated by a locking element 351 and is fixedly connected to the control shaft 30.
Please refer to FIGS. 2 and 3 which are the sectional drawings of a preferred embodiment in the present invention. As shown, inside the inlet channel 13, a rejecting shaft 40 is provided and the lower end of the rejecting shaft 40 is connected to a spring 50. At a normal condition, the rejecting shaft 40 is rejected by the spring 50 to close to a washer 41 thereon so that the pressed atmosphere can not pass through to drive the air tool 10. Then, when the user forces a trigger 19 at the front edge of the handle 11, the trigger 19 may move the rejecting shaft 40 inside the inlet channel 13 to have a tilted angle for passing through the pressed atmosphere. Moreover, the control shaft 30 inside the valve sleeve 14 may have a movement by the user pressing the rejecting portion 35 so as to selectively locate at a first position (as shown in FIG. 2) for coupling the inlet channel 13 to the first conducting portion 32 and communicating with the first inlet air way 131, or at a second position (as shown in FIG. 3) for coupling the inlet channel 13 to the second conducting portion 33 and communicating with the second inlet air way 132. Here, through the separating portion 31, the pressed atmosphere, each time, only can enter the first inlet air way 131 or the second inlet air way 132, so that the purpose of controlling the rotation direction of the air tool 10 can be achieved by the control shaft 30 changing the inlet air way of the air tool 10.
Please refer to FIG. 4 which shows the partial sectional drawing of a preferred embodiment in the present invention. Currently, the air tool 10 is always housed by a plastic material, so that the valve sleeve 14 can not be installed in the air tool 10 by pressing owing to the matching difficulty between the metal material of the valve sleeve 14 and the plastic material. Accordingly, in the present invention, the valve sleeve 14 below the cylinder 15 is fixed with the cylinder 15 by a fixing element 151, which can be a screw, and through the locking and fixing, the valve sleeve 14 can be accurately positioned in the air tool 10. Consequently, the present invention is extremely suitable for being applied to the common-used plastic housed air tool 10.
In the aforesaid, the present invention provides a valve sleeve 14 below the cylinder 15 and a control shaft 30 inside the valve sleeve 14 so that, except controlling the rotation direction of the air tool 10, the operation of the air tool 10 also becomes more convenient. The user, only by one hand, can simultaneously hold the air tool and control the ON/OFF (by pressing trigger 19) and the rotation direction (by pressing the control shaft 30). Furthermore, since the valve sleeve 14 is fixed with the cylinder 15 through a fixing element 151, the present invention is greatly suitable for the plastic housed air tool 10.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.