US3680789A - Spray gun - Google Patents

Spray gun Download PDF

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Publication number
US3680789A
US3680789A US134634A US3680789DA US3680789A US 3680789 A US3680789 A US 3680789A US 134634 A US134634 A US 134634A US 3680789D A US3680789D A US 3680789DA US 3680789 A US3680789 A US 3680789A
Authority
US
United States
Prior art keywords
oil
pump
head
piston
sump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US134634A
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English (en)
Inventor
Josef Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Josef Wagner GmbH
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3680789A publication Critical patent/US3680789A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/08—Apparatus to be carried on or by a person, e.g. of knapsack type
    • B05B9/085—Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump
    • B05B9/0855—Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump the pump being motor-driven
    • B05B9/0861—Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump the pump being motor-driven the motor being electric

Definitions

  • an electric vibrator driven paint spray gun having an oil sump defining head housing an electric vibrator and a piston pump that hydraulically drives a diaphragm pump receiving paint from a container suspended from the head and discharging to a spray nozzle with the spray rate controlled by adjusting the stroke of the vibrator with an adjusting screw carried by the head.
  • the sealing and is eliminated by completelyisolating the piston pump from the spray media.
  • This is accomplished by pumping the spray media 'with a diaphragm exposed on one side to the. spray media and on the opposite side to a hydraulic piston pump submerged in an oil sump and driven by an electric vibrator.
  • the diaphragm draws the spray media into a valved chamber on one side thereof.
  • the chamber is closed to trap the spray medium therein.
  • the diaphragm propells the trapped medium to the spray nozzle.
  • the opposite side of the diaphragm is propelled by oil from the sump trapped ahead of the piston.
  • the piston is driven by the oscillating head of an electric vibrator and its stroke is adjusted by controlling the stroke of diaphragm on the pressure stroke of the piston, leadage of such trapped oil is replenished through ports which, however, accommodate restricted backflow so that a reduced volume of trapped liquid can be established to permit a reduced stroke of the piston.
  • the piston drives the diaphragm through the oil trapped between the piston and diaphragm, but uncovers the ports at its top dead center position so that leakage may be replenished to maintain a full oil charge ahead of the piston on its pressure stroke when the stroke is maintained constant. When the stroke is lessened, however, the excess trapped oil may be relieved through these ports.
  • the port passages converge toward the interior of the cylinder in a manner to accommodate flow into the cylinder while restricting flow out of the cylinder.
  • a feature of theinvention includes the provision of an oil sump in the head of the spray gun which houses the electric vibrator motor and the piston pump. Since the diaphragm pump is relatively free from wearable parts, its body may be made of plastic and secured to the bottom of the head with the diaphragm clamped in position and the entire assembly secured to the head by screws. The body of the piston pump is preferably held by a flange clamped between the bottom of the head and the body of the diaphragm pump so that both pump bodies are removable as a unit from the pump head.
  • the diaphragm body carries an inlet valve receiving the pumping media from a container suspended from the head and also mounts the outlet nozzle carrying an outlet valve.
  • lt is then an object of this invention to provide an inexpensive lightweight portable spray gun having a head defining an oil sump and mounting an electric vibrator motor and a hydraulic piston pump driven by the motor which in turn drives a diaphragm pump suspended from the head and isolating the pumping media from the piston pump and oil sump.
  • Another object of this invention is to provide a lightweight portable paint spray gun with a piston pump which hydraulically drives a diaphragm pump separating the pumping media from the piston pump. 7
  • a further object of this invention is to provide an electric spray gun with a piston pump hydraulically driving a diaphragm pump for the spray media.
  • a specific object of the invention is to provide an electric spray gun having a hydraulic piston pump driven by an electric vibrator and in turn driving the diaphragm communicating on one side with the piston pump and on the other side with the spray media and having ports in the piston pump accommodating flow of hydraulic fluid ahead of the piston so that the stroke of the piston may be changed to vary the pumping rate of the diaphragm pump.
  • a specific object of this invention is to provide a lightweight inexpensive electric spray gun with a hollow head providing an oil sump and housing an electric vibrator motor and a piston pump driven thereby and suspending a diaphragm pump driven by the piston pump which effects the pumping of the spray media and having a cover closing the head carrying a screw control for regulating the stroke of the vibrating motor to thereby control the stroke of the piston pump.
  • FIG. 1 of the drawing is a vertical crosssectional view, with parts in elevation, of the head portion of a spray gun of this invention and partially illustrating the handle of the gun and the container for the spray medial suspended from the head.
  • the spray gun shown in the drawing includes a housing head 1 closed by a lid 2 and mounting an electric vibrator motor having a stator 3 with magnetic coils 4 and a pivot 5 for a vibrating head or oscillating armature 6.
  • the armature 6 drives a piston pump with a piston 7 slidable in an upright cylinder 8 and biased against the armature 6 by a spring 9.
  • a diaphragm pump is suspended from the head 1 and includes a diaphragm l0 clamped between a bushing 11 and the pump body 12.
  • the diaphragm l0 separates the chamber provided by the bushing 11 and the pump body 12 into an oil area or sump l3 and an underlying pumping chamber or area 14 for the spray media to be pumped.
  • a spring 15 in the pump body 12 biases a plate 16 against the underface of the diaphragm 10 to springload the diaphragm against the oil in the sump 13.
  • An inlet valve 17 biased to a closed position by a valve spring 18 is mounted under the diaphragm 10 and spring plate 16 being supported in the housing 12 by a threaded nipple 19 with a depending stud receiving the inlet tube 20 for the spray media.
  • the tube 20 may communicate either with a separate paint container or, as shown, to a container 21 suspended under the housing head 1.
  • An outlet channel 23 communicates with the diaphragm or pumping area 14 and discharges through a valve 24 to the spray nozzle 25.
  • Channels or ports 26 are provided in the cylinder 8 of the piston pump to replenish oil which might leak out of the pump as well as to regulate the quantity of oil trapped ahead of the piston 7 when the stroke of the piston is changed.
  • the cross-sectional area of the channels 26 is gradually tapered toward the interior of the cylinder 8 to provide for relatively free flow through the channels into the cylinder but to restrict or attenuate flow from this cylinder.
  • the channels 26 are located at a level in the cylinder 8 so as to be uncovered at the upper dead center position OT of the piston 7.
  • the stroke of the piston 7 is adjusted by a set screw 27 threaded in the lid 2 and engaging a leaf spring 28 having one end anchored to the lid and the other end bottomed on the free end of the oscillating armature 6 above the piston. Threading of the screw 27 into the lid will load the leaf spring 28 more tightly against the oscillating head 6, thereby restricting its travel.
  • a handle 30 is suspended from the head 1 by means of screws or the like and carries a push-button 31 controlling current flow through electric conduits energizing the coil 4.
  • the entire interior area 32 of the housing 1 is filled with oil so that the cylinder 8 of the piston pump is completely immersed in oil.
  • the cylinder 8 of the piston pump is held in upright position in the housing 1 by the bushing 11 which has a flange 33 with one side bottomed on the floor 34 of the housing head and the other side bottomed on the pump body 12. Screws indicated at S secure the pump body to the floor 34 of the head 1 and clamp the diaphragm 10 between the pump body and the bushing flange 33.
  • the bushing 11 in turn carries the cylinder 8.
  • both the piston pump and the diaphragm pump form, together with the inlet valve 17, a unit secured to the bottom of the head 1 by the screws S which can be assembled or disassembled for service or replacement of parts.
  • the pump body 12 may be composed of plastic.
  • the diaphragm 10 is urged upwardly by the spring biased plate 16 enlarging the pumping area 14 and creating a reduced pressure therein sufficient to open the inlet valve 17 against the spring load 18 and aspirating the spraying media into the pumping chamber 14 via the inlet tube 20.
  • the set screw 27 is turned upwardly so that the upper dead center OT of the piston 7 will be at a higher level in the cylinder 8. This increases the area ahead of the piston so that during the upward movement of the piston oil is aspirated through the ports 26 from the oil sump 32. Due to the tapered design of the ports 26, the amount of oil flowing back to the sump during the subsequent pressure stroke of the piston 7 prior to the piston covering the ports 26 will be much smaller than the amount of oil previously aspirated into the cylinder. Thus, a greater volume of oil will be trapped ahead of the piston to fill the increased area provided by the increased stroke of the piston. This in turn increases the stroke of the diaphragm 10 and in turn increases the pumping rate of the diaphragm pump.
  • this invention now provides an improved spray gun which completely separates the spraying media from the pumping mechanism and conveniently houses an electric motor driven piston pump in an oil sump pro vided by the head of the gun while suspending a diaphragm pump for the pumping media from this head.
  • a spray gun which comprises a housing defining an oil sump, a hydraulic piston pump in said housing adapted to be immersed in and receive oil from said sump, an electric motor in said housing driving said pump, a diaphragm pump driven hydraulically from said piston pump, said diaphragm pump having an oil receiving chamber communicating with the piston pump and a pumping chamber communicating with the fluid medium to be sprayed, and said diaphragm separating said two areas to isolate the piston pump and oil sump from the pumping chamber media, and means for adjusting the stroke of the piston to control the quantity of the medium being sprayed.
  • a spray gun which comprises a head defining an oil sump, an electric oscillating motor in said head, a piston pump in said sump driven by said motor and adapted to be submerged in oil in the sump, a lid on said head, an adjustingscrew carried by said lid controlling the stroke of said motor, a handle suspended from said head, a control switch carried by said handle forenergizing said motor, a diaphragm pump suspended from said head having an inlet adapted to communicate with the medium to be sprayed, a spray nozzle receiving spray medium from said diaphragm pump, said diaphragm pump having an oil chamber communicating with oil from the piston pump and a pumping chamber communicating with the spray medium and with the outlet nozzle, an inlet valve controlling inflow to the pumping chamber, an outlet valve controlling outflow from the pumping chamber, said diaphragm isolating the oil from the spray medium, and ports in the piston pump replenishing oil from the sump I to the oil chamber of the diaphragm pump.
  • a portable electric spray gun especially adapted for spraying paints, which comprises a hollow head defining an oil sump, an electric motor mounted in said head, a piston pump receiving oil from said oil sump driven by said electric motor, a handle depending from said head, a control switch carried by said handle controlling current flow to said electric motor in said head, a diaphragm pump suspended from said head having an oil chamber receiving oil from said piston pump and a pumping chamber, a container for spray media suspended from said head communicating with said pumping chamber of said diaphragm pump, an inlet valve controlling flow from said container to said pumping chamber, a spray nozzle communicating with said pumping chamber, an outlet valve controlling flow from the pumping chamber to the spray nozzle, means for adjusting the stroke of said piston pump to control the quantity of spray medial pumped by said diaphragm pump, and means bleeding oil from said sump between the piston pump and diaphragm pump for replenishing oil leakage and for bleeding oil back to the sump to accommodate a change in stroke of the piston.
  • the spray gun of claim 1 including at least one oil intake port opening to the interior of the cylinder at the upper dead center position of the piston and converging toward the interior of the cylinder to restrict backflow from the cylinder to the sump.
  • the spray gun of claim 1 wherein the piston pump has an upright cylinder in the oil sump having converging ports accommodating flow of oil from the sump into the cylinder head of the piston and to accommodate flow of oil from the cylinder back to the sump at a hi her attenuation ra e n the 'nflow to th c linder.

Landscapes

  • Reciprocating Pumps (AREA)
  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)
US134634A 1970-04-18 1971-04-16 Spray gun Expired - Lifetime US3680789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702018789 DE2018789A1 (de) 1970-04-18 1970-04-18 Handspritzpistole zum Versprühen von Flüssigkeiten, insbesondere von Farben

Publications (1)

Publication Number Publication Date
US3680789A true US3680789A (en) 1972-08-01

Family

ID=5768502

Family Applications (1)

Application Number Title Priority Date Filing Date
US134634A Expired - Lifetime US3680789A (en) 1970-04-18 1971-04-16 Spray gun

Country Status (13)

Country Link
US (1) US3680789A (pl)
AT (1) AT310902B (pl)
AU (1) AU2772771A (pl)
BE (1) BE765870A (pl)
BR (1) BR7102261D0 (pl)
CA (1) CA951283A (pl)
CH (1) CH513677A (pl)
CS (1) CS157706B2 (pl)
DE (1) DE2018789A1 (pl)
ES (1) ES198771Y (pl)
FR (1) FR2090525A5 (pl)
GB (1) GB1278229A (pl)
NL (1) NL7105087A (pl)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894816A (en) * 1973-08-22 1975-07-15 Wooster Brush Co Hand held paint sprayer
US3899134A (en) * 1973-07-20 1975-08-12 Josef Wagner Spray gun
US3904116A (en) * 1975-01-09 1975-09-09 Disston Inc Portable cordless sprayer
US3957399A (en) * 1975-03-20 1976-05-18 Graco Inc. Diaphragm pump
US3993250A (en) * 1975-05-19 1976-11-23 Shure Alan H Apparatus for spraying liquid materials
US4030665A (en) * 1974-05-20 1977-06-21 Goldwell Gmbh Apparatus for foaming liquid cosmetic substances
US4667575A (en) * 1977-07-22 1987-05-26 Valleylab, Inc. Pump actuator assembly
US4744516A (en) * 1985-08-22 1988-05-17 J. Wagner Gmbh Air aspirated cooling for spray guns
US5141162A (en) * 1989-10-27 1992-08-25 Wagner Spray Tech Corporation Variable inlet spraying apparatus
US5277341A (en) * 1991-01-29 1994-01-11 Conceptair Anstalt Device for spraying a fluid by means of a pump that is actuated repeatedly by a solenoid
US6168093B1 (en) 1998-12-30 2001-01-02 Homax Products, Inc. Airless system for spraying coating material
US6267302B1 (en) 1999-05-17 2001-07-31 David Clark Huffman Spray gun with rolling wall diaphragm and quick disconnect housing
US20080230630A1 (en) * 2007-03-08 2008-09-25 Illinois Tool Works Inc. Color matching system and method
US20100322795A1 (en) * 2009-06-22 2010-12-23 Wagner Spray Tech Corporation Dynamic control of an electric drive
US8251255B1 (en) 2004-07-02 2012-08-28 Homax Products, Inc. Aerosol spray texture apparatus for a particulate containing material
US8336742B2 (en) 2004-10-08 2012-12-25 Homax Products, Inc. Aerosol systems and methods for dispensing texture material
US8353465B2 (en) 2003-04-10 2013-01-15 Homax Products, Inc Dispensers for aerosol systems
US9156042B2 (en) 2011-07-29 2015-10-13 Homax Products, Inc. Systems and methods for dispensing texture material using dual flow adjustment
US9248457B2 (en) 2011-07-29 2016-02-02 Homax Products, Inc. Systems and methods for dispensing texture material using dual flow adjustment
USD787326S1 (en) 2014-12-09 2017-05-23 Ppg Architectural Finishes, Inc. Cap with actuator
US20180117611A1 (en) * 2014-12-22 2018-05-03 San-Ching Chen Low-pressure and low-noise spray device
US11148155B2 (en) 2014-12-22 2021-10-19 San-Ching Chen Spray device
US11986850B2 (en) 2018-04-10 2024-05-21 Graco Minnesota Inc. Handheld airless sprayer for paints and other coatings

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53144014A (en) * 1977-05-20 1978-12-15 Masaya Koyama Automatic sprayer
US4364520A (en) * 1980-08-26 1982-12-21 Weber Sr Edwin J Piston pump actuated diaphragm pump for spraying liquids

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819061A (en) * 1955-03-30 1958-01-07 Niagara Machine & Tool Works Power press cushion lubricating apparatus
US3116879A (en) * 1962-01-30 1964-01-07 Charles S Tanner Company Spray head for spray gun
US3120347A (en) * 1962-07-16 1964-02-04 Jr Charles S Duke Spray gun
US3163360A (en) * 1962-12-26 1964-12-29 Vilbiss Co Airless spray gun utilizing low pressure coating material source
US3462082A (en) * 1967-01-10 1969-08-19 Kastar Inc Fluid dispensing apparatus
US3565344A (en) * 1967-06-30 1971-02-23 Mitsubishi Electric Corp Electric sprayer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819061A (en) * 1955-03-30 1958-01-07 Niagara Machine & Tool Works Power press cushion lubricating apparatus
US3116879A (en) * 1962-01-30 1964-01-07 Charles S Tanner Company Spray head for spray gun
US3120347A (en) * 1962-07-16 1964-02-04 Jr Charles S Duke Spray gun
US3163360A (en) * 1962-12-26 1964-12-29 Vilbiss Co Airless spray gun utilizing low pressure coating material source
US3462082A (en) * 1967-01-10 1969-08-19 Kastar Inc Fluid dispensing apparatus
US3565344A (en) * 1967-06-30 1971-02-23 Mitsubishi Electric Corp Electric sprayer

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899134A (en) * 1973-07-20 1975-08-12 Josef Wagner Spray gun
US3894816A (en) * 1973-08-22 1975-07-15 Wooster Brush Co Hand held paint sprayer
US4030665A (en) * 1974-05-20 1977-06-21 Goldwell Gmbh Apparatus for foaming liquid cosmetic substances
US3904116A (en) * 1975-01-09 1975-09-09 Disston Inc Portable cordless sprayer
US3957399A (en) * 1975-03-20 1976-05-18 Graco Inc. Diaphragm pump
US3993250A (en) * 1975-05-19 1976-11-23 Shure Alan H Apparatus for spraying liquid materials
US4667575A (en) * 1977-07-22 1987-05-26 Valleylab, Inc. Pump actuator assembly
US4744516A (en) * 1985-08-22 1988-05-17 J. Wagner Gmbh Air aspirated cooling for spray guns
US5141162A (en) * 1989-10-27 1992-08-25 Wagner Spray Tech Corporation Variable inlet spraying apparatus
US5277341A (en) * 1991-01-29 1994-01-11 Conceptair Anstalt Device for spraying a fluid by means of a pump that is actuated repeatedly by a solenoid
US6168093B1 (en) 1998-12-30 2001-01-02 Homax Products, Inc. Airless system for spraying coating material
US6267302B1 (en) 1999-05-17 2001-07-31 David Clark Huffman Spray gun with rolling wall diaphragm and quick disconnect housing
US8820656B2 (en) 2003-04-10 2014-09-02 Homax Products, Inc. Dispenser for aerosol systems
US9132953B2 (en) 2003-04-10 2015-09-15 Homax Products, Inc. Dispenser for aerosol systems
US8353465B2 (en) 2003-04-10 2013-01-15 Homax Products, Inc Dispensers for aerosol systems
US8251255B1 (en) 2004-07-02 2012-08-28 Homax Products, Inc. Aerosol spray texture apparatus for a particulate containing material
US8336742B2 (en) 2004-10-08 2012-12-25 Homax Products, Inc. Aerosol systems and methods for dispensing texture material
US20080230630A1 (en) * 2007-03-08 2008-09-25 Illinois Tool Works Inc. Color matching system and method
US8465263B2 (en) * 2009-06-22 2013-06-18 Wagner Spray Tech Corporation Dynamic control of an electric drive
US20100322795A1 (en) * 2009-06-22 2010-12-23 Wagner Spray Tech Corporation Dynamic control of an electric drive
US9156042B2 (en) 2011-07-29 2015-10-13 Homax Products, Inc. Systems and methods for dispensing texture material using dual flow adjustment
US9248457B2 (en) 2011-07-29 2016-02-02 Homax Products, Inc. Systems and methods for dispensing texture material using dual flow adjustment
USD787326S1 (en) 2014-12-09 2017-05-23 Ppg Architectural Finishes, Inc. Cap with actuator
US20180117611A1 (en) * 2014-12-22 2018-05-03 San-Ching Chen Low-pressure and low-noise spray device
US11148155B2 (en) 2014-12-22 2021-10-19 San-Ching Chen Spray device
US11986850B2 (en) 2018-04-10 2024-05-21 Graco Minnesota Inc. Handheld airless sprayer for paints and other coatings

Also Published As

Publication number Publication date
NL7105087A (pl) 1971-10-20
FR2090525A5 (pl) 1972-01-14
DE2018789A1 (de) 1971-10-28
BR7102261D0 (pt) 1973-04-19
PL73374B1 (pl) 1974-08-30
CA951283A (en) 1974-07-16
AT310902B (de) 1973-10-25
CS157706B2 (pl) 1974-09-16
CH513677A (de) 1971-10-15
AU2772771A (en) 1972-10-19
BE765870A (fr) 1971-09-16
GB1278229A (en) 1972-06-21
ES198771Y (es) 1975-11-16
ES198771U (es) 1975-06-16

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