Patent Application
20080116296
1. Technical Field
The present invention relates to spray guns, and more particularly, to a spray gun with a structure in which a nebulizing device is combined with a gun body forming a nozzle with the threadless combining end of the nebulizing device pushed into the gun body contacting a fluid in the gun body.
2. Description of Related Art
Spray guns are popularly utilized for spraying coloring or protectively coating material on articles and have to be cleaned before color change or after use to avoid undesirable color intermixing. Such spray gun is typically assembled by means of screwing a fluid disperser unit and a paint delivering channel to a gun body.
The present invention has been accomplished under the circumstances in view.
It is one object of the present invention to provide a spray gun with the fluid disperser unit assembled and communicated to the fluid control valve unit with a threadless combining portion thereof so that the fluid disperser unit can be assembled or disassembled from the fluid control valve without the assistance of a special tool.
It is another object of the present invention to provide a spray gun, in which a linked push structure is provided between an air nebulizing cap and the fluid disperser unit so that when the air nebulizing cap is combined with the gun body, the threadless combining end can be pushed to become communicated with the fluid control valve unit.
To achieve foregoing objects, the spray gun of the present invention is composed of a gun body and a nebulizing device attached to the front portion of the gun body whereby paint and air can be nebulized and formed into a predetermined spraying scope by the nebulizing device.
Said nebulizing device comprises an air nebulizing cap and a fluid disperser unit, wherein the nebulizing cap is composed of a fixed nut and a nebulizing nozzle while the fluid disperser unit is composed of a fluid nozzle and an air disperser unit.
Said fluid nozzle has one end thereof formed as a threadless combining portion. As a linked push structure is provided between the air nebulizing cap and the fluid disperser unit, the threadless combining portion can be pushed toward and therefore contacts the gun body when the air nebulizing cap is assembled to the gun body.
The invention as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein:
One embodiment of the spray gun according to the present invention has been depicted through
a) a paint feeding unit 2, which includes a paint delivering channel 21 with one end detachably combined with a paint reservoir 22 in an airtight way while the other end fixedly fastened to the inside of the gun body 1;
b) a fluid control valve unit 3, which included a fluid passage 32 positioned at a front portion 31 of the gun body 1 and communicable with the paint delivering channel 21, a nebulizing area 321 adjacent to the front end of the fluid passage 32, a stopper 322 for making the rear end of the fluid passage 32 air-tight;
a needle 35 in a tapered shape which having a pressing part 351 which is diametrically enlarged in the middle portion thereof, an elastic element 352 which is closely compressed upon the pressing part 351 wherein the needle 35 is pierced from a threaded passage 34 located at the rear portion 33 of the gun body 1 through said fluid passage 32 and sticking out the front portion 31 by way of the nebulizing area 321; and
an adjusting nut 36, for receiving said elastic element 352 and being coupled with the threaded passage 34 wherein the elastic element 352 is compressed onto the adjusting nut 36, so that the needle 35 can be repositioned;
c) an operating unit 4, which includes a operational space 421 contained in the threaded passage 34 at the segment isolated from the fluid passage 32;
a trigger 41, which has one end thereof pivotally fastened to the gun body 1, a linked component 42 located within the operational space 421 and pierced by the needle 35 wherein the linked component 42 is compressing upon the pressing part 351 so that the trigger 41 can be repositioned;
an air control valve 43, which is settled inside the gun body 1, and having a push rod 431 stretching toward the trigger 41; and
d) an air delivering unit 5, which comprises a pipe connector 51 positioned at the bottom of a handle 11 of the gun body 1 and an air input passage 52 communicated to the pipe connector 51 and the air control valve 43, wherein the air input passage 52 is extending beyond the air control valve 43 and after the air control valve 43 forked into two channels, wherein one is a first air output passage 521 leading into the front portion 31 while the other is a second air output passage 522 leading into the nebulizing area 321; and
an nebulizing device 6, which is attached to the front portion 31 of the gun body 1, and can pivot on one end thereof connected to the gun body 1 anticlockwise when the trigger 41 is triggered and the needle 35 of fluid control valve unit 3 as well as the push rod 431 of air control valve 43 are pushed toward the rear portion 33 of the gun body 1 by the trigger 41, so that paint and high-pressure air are allowed to enter the nebulizing device 6, and the high-pressure air successively helps for nebulizing the paint to be sprayed.
Foresaid nebulizing device 6 further comprises:
a fluid nozzle 61, which has a central passage 611, an annular first driven part 612 located at one end of the central passage 611, a threadless combining end 613 and a washer 614 provided between the first driven part 612 and the threadless combining end 613 wherein the central passage 611 has the other end thereof positioned adjacent to a fluid converging area 615 and further contacting the fluid outlet 616;
an air disperser 62, which is in an annular shape and has a central through hole 621, a second drive part 622 with a depressed air converging area 623 at one side, an annular propping part 624 with a depressed air input area 625 and an accommodating part 626 at the other side, and at least one dispersing hole 627 provided for communicating both sides whereby the air disperser 62 can be put around the fluid nozzle 61 with the through hole 621 and have the first driven part 612 accommodated by the accommodating part 626; and
an nebulizing cap 63, which is detachably combined with the front portion 31 of the gun body 1 by means of a fixed nut 64 which is connected to a rotatable nebulizing nozzle 65 wherein the nozzle 65 has one side thereof rotatably inlayed into the fixed nut 64 and has an air converging area 651 which comprises an interacting part 652 at the periphery thereof for compressing upon the second driven part 622; and the nebulizing nozzle 65 further contains at least one first air outlet 653 for communicating the both sides thereof, a second air outlet 654 provided in the air converging area 651 at the opposite side of the nozzle 65 with respect to and correspondingly to the first air outlet 653, and a nebulizing area 655 defined between the first air outlet 653 and second air outlet 654.
Thus, when the fluid nozzle 61 covered by the air disperser 62 with a nozzle head 617 thereof pierces into the second air outlet 654, the second air outlet 654, as can be seen in
Further, a linked push structure is provided among the nebulizing cap 63, air disperser 62 and fluid nozzle 61 by screwing the fixed nut 64 to the gun body 1 whereby the interacting part 652 pushes the second drive part 622 toward the gun body 1 and the accommodating part 626 pushes the first driven part 612 in the same direction until the first driven part 612 comes into closely contact with the front portion 31.
Therefore, the central passage 611 can be communicated with the fluid passage 32 and the paint can be filled into the nozzle head 617 by way of the fluid converging area 615. At this time, since the fluid outlet 616 of the nozzle head 617 is obstructed by the tip of the needle 35 of the fluid control valve unit 3, the paint can be held from leaking.
Referring to
The rest high-pressure air is led to the semi-closed nebulizing area 321 through the first air output passage 521, and ejected from the first air outlet 653 to help spraying the nebulized paint within the nebulizing area 655 in a predetermined spraying scope.
The advantages of the present embodiment are as follows.
Certainly, there can be various embodiments according to the present invention. As a second embodiment of the present invention shown in
The linked push structure between said fluid disperser unit 71 and nebulizing cap 72 is now varied because the fluid nozzle 711 and the air disperser ring 712 integratedly formed. In such structure, an air converging area 7221 of the nebulizing nozzle 722 has an annular interacting part 7222 for compressing upon a driven part 7122 provided at the periphery of the air disperser ring 712 to push a threadless combining end 7113 of the fluid nozzle 711 into the fluid passage 32 of gun body 1 until an annular propping part 7112 comes into contact with the front portion 31, and a washer 7114 is further provided to prevent paint leakage.
A third embodiment of the present invention is illustrated through
The air disperser ring 712 is installed in an air converging area 7221 of the nebulizing nozzle 722 so that the driven part 7122 can compress upon the interacting part 7222 and between the groove 7121 and the inner wall of the air converging area 7221 a through channel can be defined. Thereby, the high-pressure air can enter the air converging area 7221 after being dispersed by the groove 7121.
Again, a washer can be arranged between the threadless combining portion 613a and port 32a.
To sum up, the technical concept of the present invention is to realize the combination of the nebulizing device and gun body by pushing the threadless combining end of the air nebulizing cap into the fluid passage to make the fluid passage intercommunicated with a central passage of the air nebulizing cap. It is to be understood that though the air disperser 62 and the fluid nozzle 61 are present in separate parts while the air disperser ring 712 and the fluid nozzle 711 are formed integratedly, the dispersing hole 627 and the through channel defined between the groove 7121 and the inner wall of the nebulizing nozzle 722 perform the same function of allowing air passing and converging and therefore should be regarded as embodiments of the identical air disperser unit.
Although particular embodiments of the invention have been described in detail for purposes of illustration, it will be understood by those skilled in the art that numerous variations are possible to the disclosed embodiments without going outside the scope of the invention as disclosed in the following claims:
