JPH0632820Y2 - Paint spray gun - Google Patents

Description

[Detailed description of the device]

This invention relates to the improvement of paint spray guns.
In particular, the present invention relates to a paint injection gun having excellent paint workability. Conventional technology Conventional spray guns have a structure in which a paint hose that sends pressurized paint is connected near the paint outlet and an air hose is connected to the grip in order to simplify the paint flow path. Most of the time, the thick and heavy pressure hose makes the workability worse, but this kind of spray gun generally sprays only the dedicated spray gun and paint used when spraying mixed with air. It was uneconomical because it was divided into a dedicated gun in some cases and there was no one that could use both cases. Further, when the coating pattern is changed, it is generally performed by adjusting the distance between the air outlet nozzle and the paint outlet or by adjusting the amount of air.At that time, the air outlet is changed to the paint outlet. Since it has a mechanism to move it to the other side, moving the air flow path with the center of the air outlet and the center of the paint outlet aligned requires high-precision processing, making the device expensive. There was a drawback. Also,
When changing the coating pattern by adjusting the amount of air blown out, the conventional coating gun has a configuration in which the movement distance of the operation lever is the same as the movement distance of the valve body. It was pretty difficult. The purpose of the invention The present invention has been made in consideration of such a situation, and it has good operability, and the coating pattern is not disturbed easily, and the amount of air blown out can be easily adjusted by the lever handle. It is an object of the present invention to disclose a paint injection gun that can be used in both cases of airless coating and airless coating. Configuration of the Invention The gist of the present invention is to have a paint spray port 10 that is opened laterally at one end, and is provided with paint flow channels 31, 31 a that communicate with the spray port and extend in the horizontal direction and a gas flow channel 21. The injection gun body 1, a grip 50 provided on the injection gun body downward from the injection gun body 1 at a constant angle with respect to the paint spraying direction, and swingable on the injection gun body. Lever handle 4 attached and extending along the grip
0, and a gas introduction flow path 52 is provided in the grip 50.
And a paint introduction flow path 53 are provided, and the gas and paint introduction flow paths are respectively provided via a gas flow path opening / closing valve 20 and a paint flow path opening / closing valve 30 provided in the injection gun body. In the paint injection gun communicating with the gas flow path and the paint flow path, one end of the valve rod 25 of the gas flow path opening / closing valve is
A valve chamber 2 provided through the injection gun body in a substantially vertical direction.
2 is upwardly projected from the lever handle by a resilient force (27) for urging the valve rod in the valve closing direction while maintaining air and liquid tightness, and is provided at the top of the lever handle and from the rotation center of the lever handle. One end of the valve rod 36 of the paint flow passage opening / closing valve, which is slidably pressed against an engaging edge 41 having an unequal distance and laterally protrudes from the end of the injection gun body opposite to the injection port. Is provided with an engagement piece 37 whose one end engages with the lever handle, and in the mechanism for adjusting the coating pattern of the paint injection gun, the fumes 5 forming a gas flow path. A coating flow passage 31a composed of a ring wall 6 surrounding this is provided, and the coating nozzle 10 of the nozzle cap is movably faced by the nozzle cap 11 screwed onto the ring wall. Paint spray gun with different construction Located in. The paint spray gun of the present application is a valve rod 25 of a gas flow path opening / closing valve.
Is in pressure contact with an engaging edge 41 provided on the top of a lever handle 40 that is swingably held by the injection gun main body 1, and this engaging edge swings near the lower end of the lever handle 40. The swinging distance of the engaging edge 41 is significantly smaller than the moving distance, and the swinging distance of the engaging edge 41 forms an unequal distance from the pivot shaft 43, which is the swing center of the lever handle 40. Since the engaging edge 41 has a structure for pushing the valve rod 25 into the valve chamber 22, the operation amount of the lever handle is
It is greatly reduced and transmitted to the valve rod 25. This makes it easier to adjust the amount of air compared to conventional injection guns. In addition, the manufacturing of the conventional paint injection gun that accommodates the fumarolic pipe in the paint flow passage so as to be concentrically movable requires precise processing and requires skill to handle. The structure in which the passage-forming fumes 5 are detachably fixed to the center of the ring wall 6 and the nozzle cap is screwed around the rings, makes it easy to align the injection port 10 with the center of the fumes 5 Even if the nozzle cap is moved upward to move the distance between the fumarole 5a of the fumarolic pipe and the jet port 10, the centers of the fumaroles 5a and 10 do not substantially change, and the adjusting operation is easy.

【Example】

Hereinafter, one embodiment will be described in detail with reference to the drawings. FIG. 1 is a paint spray gun showing an embodiment of the present invention, which comprises a spray gun body 1 and a grip 50. The grip 50 is composed of a tubular body 51 having a substantially elliptical cross section, in which a gas introduction flow path 52 formed of a pipe for guiding a gas such as compressed air to the injection gun body and a paint pumped by a paint pump are the same. Further, a paint introduction flow path 53 composed of a pipe leading to the main body of the injection gun is incorporated. Both introduction channels 52, 53
A gas flow passage opening / closing valve 20 and a paint flow passage opening / closing valve 30 are provided at the connecting portion between the injection gun body 1 and the injection gun main body 1, respectively. Respectively,
The gas flow passage 21 and the paint flow passage 31 communicate with each other. The gas flow path opening / closing valve 20 is housed in a valve chamber 22 that penetrates the injection gun main body 1 along the extension direction of the gas introduction flow path 52, and is held by a valve rod 25. It is composed of a valve body 23 and a coil spring 27 that elastically presses the valve body 23 against the valve seat 24 to close the valve seat 24. The valve rod 25 that holds the valve body 23 has its upper end and its vicinity projecting outward from the valve chamber 22, and an engaging edge 41 provided on the top of the lever handle 40 is in contact with the projecting end.
Further, the paint flow passage opening / closing valve 30 is provided at one end of the injection gun body 1,
A cylindrical valve chamber 32 and a spherical valve 34 concentrically housed in the valve chamber 32 are built in a valve mechanism built-in hole 2 bored along the longitudinal direction thereof, and divided into two in the vicinity of the center. The on-off valve unit including the cylindrical cores 30a and 30b is fitted in a liquid-tight manner and is screwed in the screwing portion 35 on the peripheral surface thereof. Reference numeral 36 denotes a valve rod, one end of which projects outward from the on-off valve unit (30b), and a U-shaped engaging piece 37 provided in a state of sandwiching the injection gun body 1 at the projecting end is a nut 38. Engaged. This engagement piece 37
The free end 37a of the is formed in a semi-circular shape, and faces the side edge 42 of the lever handle 40 in the preceding period. In the lever handle 40, upper half bifurcated clamping pieces 40a, 40b are pivotally supported by a pivot shaft 43 provided through the injection gun body 1, and the upper ends of the clamping pieces are connected in a bridge shape. What is being done is the previous engagement edge 41. Therefore, the engagement edge 41 is provided at an unequal distance from the rotation center (43) of the lever handle, and when the lever handle 40 is pulled toward the grip side, the valve rod 25 is first moved downward. Then, after a very short time, the engagement piece 37 is also moved in the valve opening direction. 39 is a spherical valve 3
4 is a coil spring that press-contacts the valve seat 34a. The spherical valve 34 and the valve seat 34a are replaceable because the solid components such as lysine are contained in the coating material because they are worn out significantly. Further, 30c is an opening of the valve chamber 32 provided in the cylindrical core 30a, and is opened to the paint inlet 3 which is an engaging portion between the paint introducing flow passage 53 and the injection gun body. Reference numeral 4 is a positioning pin for the core 30a. The paint flow path 31 is bifurcated at a portion connected to the core 30a of the on-off valve unit, and as shown in FIG. 2, bypasses both sides of the gas flow path on-off valve so as to sandwich the gas flow path on-off valve. It reaches the annular paint flow passage 31a between the fumes 5 forming the passage 21 and the ring wall 6 formed coaxially around the fumes 5 and merges with the gas flow passage 21 in the vicinity of the injection port 10. To do. The fumarolic pipe 5 is screwed at one end into a lateral screw hole 21a leading to the valve chamber 22, and the fumarolic port 5a faces the center of the jet port 10. Inside the ring wall 6, an inner ring 7a slidable on the inner peripheral surface of the ring wall while maintaining air and liquid tightness, and on the outside,
Outer rings 7b screwed into male threads engraved on the outer peripheral surface of the ring wall are respectively provided, and the inner and outer rings 7a, 7b are provided at one end so as to surround the ring wall end edge 6b. The moving ring 7 is formed by pressure bonding and integration. The mounting screw 8 screwed onto the outer periphery of the moving ring 7 moves the axial direction of the fumarolic pipe 5 by pressing and fixing the step portion 9a of the nozzle disk 9 having the injection port 10 to the moving ring 7 in the previous period. An adjustable nozzle cap 11 is constructed. Reference numeral 12 is a nut for fixing the position of the moving ring 7. On the other hand, reference numeral 15 is a throttle valve provided in an inverted U-shaped gas bypass passage extending from the air inlet 14 forming the mounting portion of the air introduction passage 52 to the injection gun body 1 to the valve chamber 22. It is for adjusting the discharge amount. Also, 54 is a gas and paint introduction flow path 5 near the lower end of the grip 50.
The lever handle 4 is loosely fitted to the tubular body forming the portion 2, 53.
With a lever handle hook having a hook 54a on the 0 side,
The lever handle 40 is pulled to the grip 50 side as much as possible, and then the hook is shifted upward so that the lower end of the lever handle is locked by the hook 54a. To release the lock, the reverse operation is performed. In the above-mentioned embodiment, the case where the paint is atomized by the compressed air and applied is shown. However, in the case of so-called airless painting which does not use gas, the fusible pipe 5 is removed and the nozzle board 9 is appropriately shaped. Method, or a method of replacing the nozzle plate 9 with a shape suitable for airless painting while closing the fumarole 5a with a removable plug, or as shown in FIG. An extension ring 60 having a closed portion 61 of the fumarole 5a along the axis and having a paint channel 62 on both sides of the closed portion, and a nozzle ring 63 screwed to the outer periphery of the extended ring are separately prepared. Then, a method of using a nozzle cap screwed to the outer periphery of the moving ring 7 instead of the mounting screw 8 in the previous period can be adopted. Effect In the paint spray gun according to the above-described embodiment, the hose for feeding the respective pressurized fluids is connected to the portion where the paint and gas introduction flow passage projects from the lower end of the grip 51, and the throttle valve 15 is adjusted to adjust the lever. If you pull the handle 40 to the grip side, first, with the lever handle operation greatly reduced,
Applied to the protruding end of the valve rod 25 via the engagement edge 41,
The valve rod 25 slides on the engagement edge and is pushed downward to descend, the gas passage opening / closing valve 20 opens, and then the side edge of the lever handle 40 abuts on the free end of the engagement piece 37. By moving this, the paint flow path on-off valve is also opened, and the paint is sprayed from the spray port 10. When changing the coating pattern, it can be easily done by loosening the nut 12 and turning the moving ring 7 to adjust the distance between the jet port 10 and the jet port 5a, or by replacing the nozzle disc 9. it can. Moreover, unlike the conventional case of moving the fumarole 5a side, there is no difficulty in fixing the moving mechanism, so that the coating pattern is stable. Furthermore, by operating the lever handle, both the paint and gas flow paths can be opened and closed at the same time, and only the gas flow path can be opened and closed. It has the advantage that the valve operation is simple and easy to blow off.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a cross section of an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of the embodiment of FIG. 1 seen from the plane direction. FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is an explanatory view showing the main part of another embodiment of the present invention.

Claims (2)

[Scope of utility model registration request] 1. A spray gun main body having a spray nozzle for a paint opening at one end in a lateral direction, and a paint flow path communicating with the spray nozzle and extending in a lateral direction, and a gas flow path, and the spray gun. A grip provided on the spray gun main body at a certain angle with respect to the paint spraying direction downward from the main body, and a lever handle swingably attached to the spray gun main body and extending along the grip. And a gas introduction flow path and a paint introduction flow path are provided in the grip, and the gas and paint introduction flow paths are a gas flow path opening / closing valve and paint provided in the injection gun body. In a paint injection gun communicating with the gas flow path and the paint flow path via a flow path opening / closing valve, one end of a valve rod of the gas flow path opening / closing valve causes the injection gun body to move in a substantially vertical direction. Close the valve rod upward from the valve chamber that penetrates through Care by the elastic force that urges the direction,
The injection on the side opposite to the injection port is projected in a liquid-tight manner, slidably pressed against an engagement edge provided at the top of the lever handle and having an unequal distance from the rotation center of the lever handle. A paint injection gun characterized in that an engaging piece whose one end engages with the lever handle is provided at one end of a valve rod of the paint flow path opening / closing valve which projects laterally from the end of the gun body. 2. A gas flow passage is composed of a fusible pipe which is detachably attached to the discharge side of the gas flow opening / closing valve, and the fusible pipe is surrounded by a ring wall formed coaxially around the fusible pipe. A paint flow path is provided, and a nozzle cap screwed into the ring wall is turned, and the paint pattern is adjusted by moving the distance between the paint spray port provided on the nozzle cap and the fumarole of the fusible pipe. The paint injection gun according to claim 1, which is configured to: