JPH028779B2 - - Google Patents

Description

[Detailed Description of the Invention] [Prior Art and Problems Therewith] Previous United States Patent No.
No. 3,831,862, the inventors disclosed a spray tip assembly having a spray tip orifice therein. The spret tip orifice was mounted within a removable and reversible sleeve secured within the housing by interlocking sliding pins. This configuration requires loosening the body from the adapter to reverse the spray tip orifice.

Inventor's prior U.S. patent no.
No. 4,116,386, the inventor disclosed a spray tip assembly in which a spray tip orifice is mounted on a cylindrical turret member that is rotatable within a housing for reversing the orifice member for cleaning. . This construction uses a solid elastomeric plastic seal that conforms to and has a corresponding cylindrical concave surface on the turret member.

Recently published U.S. Patent No. 4165836
No. discloses that a solid plastic seal can withstand heavy use, and suggests that an all-metal seal be used to provide metal-to-metal contact between the seal and the turret member. However, experience with the apparatus of this invention indicates that this metal seal is not effective for low viscosity liquids leaking from the assembly under the high pressures used for spraying in the absence of air.

Therefore, other parts of the sprechip, along with a reversible orifice having a sealing structure that eliminates the difficulties of the prior art associated with solid plastic seals and achieves a hermetic seal even for low viscosity liquids. It would be desirable to provide a spray tip whose spray tip orifice can be easily removed and replaced without disassembling the spray tip.

[Means for Solving the Problems and Their Actions and Effects] The spray tip according to the first invention has a longitudinal through path and a cylindrical hole perpendicular to the through path, and further includes a hole extending from the outlet of the through path. It has a housing with an outwardly flared spray guard. In addition, this spray tip
a cylindrical body rotatably received within the cylindrical bore of the housing; a handle attached to a distal end of the body; a flange located between the handle and the body; The turret member has a lateral hole aligned with the passageway when in the rotational position of the turret member. A spray tip orifice is installed inside the side hole of the turret member. Further, a retainer flange is provided around the cylindrical hole of the housing, overlapping the flange of the turret member and capturing the flange. Additionally, the flange of the turret member includes a slot through which the retainer flange passes when the flange and retainer flange are in a predetermined positional relationship.

The turret member containing the spret tip orifice therein can be easily removed from the housing by aligning the slot in the flange of the turret member with a retainer flange provided in the housing. This allows the spray tip orifice to be easily removed and replaced without disassembling the spray tip body.

Furthermore, the spray tip according to the second invention, in contrast to the spray tip according to the first invention, further includes a plastic seal provided in the longitudinal passage of the housing, and a plastic seal for pressing the plastic seal toward the turret member. and means for compression.

A plastic seal provided in the passageway through the housing is pressed against the body of the turret member having a cylindrical surface to provide a strong seal against leakage of fluid from the spray tip. Plastic has a small coefficient of friction, so even if the turret member is rotated when taking it out, it prevents the turret member from interfering with its rotation or from becoming jammed. Additionally, the turret member can be removed simply by releasing the compression of the plastic seal.

EXAMPLE Referring to FIG. 1, the invention is shown in a top view. As shown here, the spray guard 10 is mounted on a housing body 12 which supports a turret member 14. This results in
A housing assembly is formed. The turret member has an attached gripping portion 16 on a shaft 18 which extends to a cylindrical turret member which will be described in detail hereinafter. Turret member 14 has an annular flange 20 with a wide portion 22 and a narrower portion 24. The body has a retainer flange 26 that covers an annular flange 20 for securing the turret assembly. The annular flange portion 24 has a slot 28 that allows for withdrawal of the turret member when rotated below the retainer flange 26.

The spray tip assembly is held onto the flared barrel of the spray gun by a retaining nut 30. Tightening this nut over the flared barrel of the spray gun axially compresses the internal seal of this assembly in a manner that will be described in more detail below.

Referring to FIG. 2, this spray tip assembly is shown in more detail. As shown here, the spray guard 10 has a body 42 that fits over the main body 12 of the spray tip housing with a central cavity 34. Spray Guard 10 is 1
It has a pair of outwardly extending radially extending vanes 36 and 38, which vanes 36 and 38 are generally trapezoidal in shape, as seen in FIG. At the intersecting apex of vanes 36 and 38, the spray gun
It has a slot 40 to provide clearance for the spray to be released from the spray tip.

The main body 12 of the Sprechip housing consists of 44
It has a longitudinal passageway 42 with opposing holes in it. The housing also has a cylindrical aperture 46 perpendicular to and transverse to the passageway 42, and the cylindrical aperture 46 receives a cylindrical turret member 48. The cylindrical turret member has a transverse hole 50 which is counter-drilled at 52 for receiving a spray tip orifice member 54. The orifice member 54 is fixed by a sleeve 53 which is firmly placed against the annular shoulder between the bore 50 and the opposed bore 52 and is pushed into the opposed bore 52 . Hole 50 should be of sufficient length so that orifice tip 54 does not protrude beyond the cylindrical surface of turret member 48.

Housing body 12 includes a sleeve 56 having an annular rim 58 received within retaining nut 30.
It is fixed to the retaining nut 30 by.
The assembly is permanently secured in the opposing holes 44 by insertion sleeves 56, and the assembly is soldered or welded at 60.

The assembly includes a flange 58 of sleeve 56.
A solid plastic T-seal 62 is provided having an annular flange 64 overlying the surface of the flange.
The T-seal has a sleeve body 64 that extends through sleeve 56 and is received within opposing holes 68 in seal support member 70. Seal support member 70 has a central hole 72 that is aligned with a passageway 74 through T-seal 62 .

The structure and shape of the seal support member and laminar seal will be described in more detail with reference to FIGS. 3 and 4.

Referring to FIG. 3, a front view of the seal assembly and seal support member is shown. As shown here, the seal 76 has a cylindrical concave portion at a central opening 78 . Laminar seal 76 is mounted on seal support member 80 .

Seal support member 80 has a cylindrical profile as shown in FIGS. 3 and 4, and also has a cylindrical recessed portion for receiving and supporting laminar seal 76. Seal support member 80 has a cylindrical profile as shown in FIGS. Tightening the spray tip assembly on the spray gun and the retaining nut 30 on the flared barrel of the spray gun applies axial compression to the seal assembly. The end of the spray gun barrel is forcefully compressed onto the surface of the T-seal flange 64 and this force is transmitted through the sleeve 66 to the shoulder 82 (the fourth (Fig.). This force compresses the laminar seal 76 against the cylindrical turret member 48 and ensures a positive seal of the assembly. Thin layer seal 7
6 is preferably comprised of a plastic having a relatively low coefficient of friction, such as Delrin (DuPont), Teflon (DuPont), etc., so that the turret member prevents the spray in the assembly without releasing the compression of the seal. It can be easily rotated by hand to reverse the orifice position, and repeated rotations of the turret member do not wear the laminar seal 76. Laminate seal 76 is also a sufficiently thin layer, eg, about 0.0254 to 2.54 mm, preferably about 0.254 to about 1.70 mm, so that significant extrusion of the plastic does not occur even during extended periods of compression. The invention thus avoids the unpleasant sticking that occurs when all plastic body seals are used.

The laminar seal 76 may be permanently abutted against either the seal support member 80 or the cylindrical surface of the turret member 48. For this purpose, a thin layer formed from Teflon powder is deposited as a coating on the opposing surfaces of any of these parts and heat treated to obtain a baked resin coating of particular thickness. Alternatively, the laminar seal may be a replaceable member that is molded or formed into the required shape to be placed between the metal seal support member 80 and the turret member 48.

With reference to FIGS. 5 and 6, the present invention includes 1
1 with an alternative spray guard as generally shown in FIG. The spray guard is two separate outwardly radially extending vanes 37 and 39, which, as can be seen in FIG. 5, are approximately trapezoidal in shape. Spray Guard has a thick base of 85
and is tapered in cross-section, tapering to a thin outer edge 87, as generally shown in FIG.

The main body 13 of the Sprechip housing is approximately 40
Forwardly projecting vanes 93 and 9 flare outwardly at an angle of between about 48 and 60 degrees, preferably between about 48 and 54 degrees.
5.

Injection molded plastic vanes 37 and 39 are shaped with slots 97 and 99 for receiving vanes 93 and 95, respectively. Each blade 93, 95 is connected to each blade 37,
39 and has a raised spherical ball 101 received in a cooperating opening 103 and serves as a detent to retain the spray guard vanes within the assembly.

The inner surface of the vane has beveled edges 105 to provide spaced slots having width X and provide clearance for spraying from the tip assembly. The inner edge of the spray guard vane also has a lip 107 which projects into the inlet of the main body 13 of the spray tip housing.

Referring to FIG. 5, the gripper 16 of the turret member 14 is rotated into the extended position for the turret member. In this position, the annular flange 2
The slot 28 in 0 is directly below the tip 26 of the body 12. As long as the retaining nut 30 fits tightly against the barrel of the spray gun and maintains a compressive force on the seal support member 70 and the resilient thin face seal 76;
The turret member is not removed from the assembly in this position. However, loosening the retaining nut 30 relieves this pressure and the turret member 14 is free to be withdrawn from the assembly to be replaced with a replaceable turret member having an orifice tip 50 of the same or different size.

As can be seen in FIG. 6, the retainer flange 26 is attached to a raised boss 27 on the body 13 of the housing. The slot 29 formed by these members is deep enough to receive the narrow flange portion 24 of the upper flange 20 of the turret member 48 and the widest flange portion 22.
It is not deep enough to accept. In this form, as shown at 31 and 33 in FIG. The passage through the turret member is angled relative to the passage through the spray tip assembly to guide the orifice tip in the spraying position and in the cleaning or return position.

The spray tip assembly of either embodiment may include a plurality of replaceable turret members having orifice tips of various sizes. The orifice tip may be increased somewhat, preferably about 0.0254 to 0.0762 mm, to a size of about 0.127 to about 0.191 mm. These orifice tips increase the width of the fan spray by approximately 5.08 cm to approx.
Make it 55.9cm.

The embodiment shown in FIGS. 5 and 6 provides a spray tip with a spray guard that cannot be easily removed. Plastic pre-guards, as commonly used, are often removed, or the plastic guard is separated from the assembly. However, the plastic wings 3 of this embodiment
Even with the removal of 7 and 39, the protective guard is not completely removed because the metal wings 93 and 95 of the housing still remain and still provide protection against spraying accidents.

The invention provides a number of distinct advantages over conventional spray tips. The plastic seal of this invention provides a complete seal against leakage even of low viscosity liquids such as water.
However, the metal or rigid seal support member provides rigid support for the seal and is thin enough that the seal does not exhibit any cold flow or extrusion under the applied pressure, so that the seal remains in contact with the turret member. Ensure that the device is not grabbed and rotated by hand. The turret member can be easily removed from the sprechip by loosening the retaining nut 30 and rotating the turret member to align the slot in the annular flange with the retainer flange of the housing body. This allows rapid replacement of the turret member without any disassembly of the other parts of the spray tip.

The seal support member may be made of any hard and durable material such as ceramic, graphite, etc., but is preferably formed from metal. Preferably, the seal support member and turret member are formed from a corrosion resistant metal such as stainless steel.

The invention has been described with reference to illustrated and currently recommended embodiments. The invention should not be considered unduly limited by the disclosure of the presently preferred embodiments. Instead, the invention is defined by the means pointed out in the appended claims and their obvious equivalents.

[Brief explanation of drawings]

FIG. 1 is a top view of the spray tip of the present invention. FIG. 2 is a front sectional view of this spray tip. FIG. 3 is a diagram illustrating the seal support member and thin layer seal used in the present invention.
FIG. 4 is a cross-sectional view taken along line 4--4 in FIG. FIG. 5 is a partial top view of a spray tip with different guards. 6 is a partial front sectional view of the spray tip shown in FIG. 5; FIG. In the figure, 10 is a spray guard, 12 is a housing body, 14 is a turret member, 16 is a gripping part, 20 is an annular flange, 26 is a retainer flange, 28 is a slot, 30 is a holding nut, 40 is a slot, and 42 is a longitudinal direction. 46 is a cylindrical hole, 48 is a cylindrical turret member, 50 is a horizontal hole, 54 is a spret tip orifice member, 56 is a sleeve, 58 is a flange of the sleeve 56, 62
is a T-seal, 64 is an annular flange, 64 is a sleeve body, 70 is a seal support member, 72 is a central hole, 74 is a through passage, 76 is a thin layer seal, 80
9 is a metal seal support member, 93 and 95 are blades, 9
7 and 99 are slots, and 107 is a lip.

Claims (1)

[Scope of Claims] 1. It has a longitudinal through path 42 and a cylindrical hole 46 perpendicular to the through path, and further includes a spray guard 10 that flares outward from the outlet of the through path. a cylindrical body 48 rotatably received within the cylindrical bore; a handle 16 attached to the distal end of the body; and a cylindrical body 48 located between the handle and the body. a turret member 14 having a flange 20 that aligns the through-hole when the barrel is in a predetermined rotational position; a lateral hole 50 that aligns the through passage when the body is in a predetermined rotational position; a spret tip orifice 54 mounted within the lateral hole; a retainer flange 26 provided around the cylindrical hole and overlapping the flange of the turret member to capture the flange; and a retainer flange 26 provided on the flange so that the flange and the retainer flange are in a predetermined positional relationship. and a slot 28 for sometimes passing said retainer flange. 2 The housing has a boss portion 2 that bulges in the radial direction.
7, the retainer flange 26 is formed on the boss, the flange 20 includes a radial slot 28 and a radial shoulder 22, the radial shoulder being captured by the retainer flange; 2. The spray tip according to claim 1, wherein in this state, the through path of the housing and the horizontal hole of the turret member are aligned. 3. A housing 12 having a longitudinal through path 42 and a cylindrical hole 46 orthogonal to the through path, and further provided with a spray guard 10 flared outward from the outlet of the through path; a cylindrical body 48 rotatably received within a cylindrical bore; a handle 16 attached to the distal end of the body; a flange 20 located between the handle and the body; a turret member 14 having a transverse hole 50 aligned with said passageway when the barrel is in a predetermined rotational position; a spret tip orifice 54 mounted within said transverse hole; and said longitudinal passage of said housing. a plastic seal 76 disposed within the passageway and means 8 for compressing said plastic seal against said turret member.
0, 62, a retainer flange 26 provided around the cylindrical hole of the housing, overlapping the flange of the turret member and capturing the flange, and a retainer flange 26 provided on the flange, where the flange and the retainer flange a slot 28 through which the retainer flange passes when in a predetermined positional relationship. 4 The housing 12 has a retaining nut 3 for fixing the spray tip to the body of the spray gun.
4. A spray tip according to claim 3 having an attached sleeve 56 having an annular flange 58 received within the spray tip. 5 having a sleeve 56 for compressing the plastic seal and being received through the sleeve 56 fixed to the housing;
- Spray tip according to claim 4, including a seal 62 and an outer flange 58 for engaging the end of the spray gun barrel. 6 the plastic seal 76 is a thin layer seal formed from plastic and having a thickness of about 0.0254 mm to about 2.54 mm; and a central through-path received within the longitudinal path and supporting the plastic seal; 6. The spray tip of claim 5 further comprising a hard surface seal support member 80 having a cylindrical concave support surface. 7 The inner end of the T-seal 62 is connected to the enlarged diameter opposing hole 68 of the seal support member 80.
7. A spretip as claimed in claim 6 received within and transmitting axial compression thereto. 8. The spray tip of claim 6, wherein said T-seal (62) is comprised of a resilient plastic having an outer flange (64) in sealing relationship with the end of said spray gun barrel.