US2654636A

US2654636A - Motor operated spray device

Info

Publication number: US2654636A
Application number: US110778A
Authority: US
Inventors: Forrest M Duncan
Original assignee: CHAMPION IMPLEMENTS CORP
Current assignee: CHAMPION IMPLEMENTS Corp
Priority date: 1949-08-17
Filing date: 1949-08-17
Publication date: 1953-10-06
Anticipated expiration: 1970-10-06

Description

Oct. 6, 1953 F. M. DUNCAN 2,654,636

MOTOR OPERATED SPRAY DEVICE Filed Aug. 17, 1949 Patented Oct. 6, 1953 MOTOR OPERATED SPRAY DEVICE Forrest M. Duncan, Long Island City, N. Y., as-

signor, by mesne assignments, to Champion Implements Corporation, New York, N. Y., a

corporation of New York Application August 17, 1949, Serial No. 110,778

Claims.

The present invention is directed to equipment for spraying various liquids such as paints and lacquers, and commonly known as a spray gun.

Devices of this character have been known for some time and usually have consisted of a compressor unit with a tank for compressed air, with a spray apparatus including a nozzle whereby the compressed air forces the liquid through the nozzle to form a spray. Such apparatus is quite bulky and can be used only where a large 7 amount of work is to be done or where continuous application of the device takes place. While it may be portable, it requires several men for transportation, and usually in conjunction with a vehicle.

It has also been proposed to provide equipment which is readily portable and which may be readily handled by the operator. For instance, in one type there was provided a magnetic motor with a pivoted armature operating a pump unit. Said unit was inserted into a container of the liquid and when the motor was operated, the liquid was sprayed. However, this type of equipment had a number of disadvantages in that it was unbalanced and was difiicult for the operator to hold with one hand. The pump arrangement being in the liquid soon became caked by the solid material in the liquid and ceased to function. It was most difficult to disassemble the device for the purpose of cleaning and the device was relatively complicated and expensive in construction.

The present invention is intended and adapted to overcome the difliculties and disadvantages inherent in prior devices of the type described, it being among the objects of the present invention to provide a spray gun which is simple in construction, which may be transported readily and which is highly effective in operation.

It is also among the objects of the present invention to provide a structure of spray gun which may be readily disassembled for cleaning or replacement purposes without the necessity of special tools or special skill on the part of the operator.

It is further among the objects of the present invention to provide a spray gun of the type described wherein maximum eifectiveness of the power in the electromagnetic motor is obtained so that a steady stream of liquid may be obtained.

In practicing the present invention, there is provided a hollow body which is usually rectangular in cross-section and in which an electromagnet is held. The poles of the magnet extend rearwardly adjacent to a vertically placed armature which is preferably not pivoted but rests upon a ledge in the bottom of the hollow member so that it is entirely free to move and thus to develop the maximum power of the motor.

Extending rearwardly from the bottom of the hollow body is a hollow handle in which is placed a suitable switch for operation of the motor. Electrical connections from a source of current enter the lower end of the handle and pass into the hollow body being connected to the motor. A trigger operating device for the switch is pivoted at the lower front end of the body so that the pressure of a finger may close the switch to operate the motor, there being provided a spring for retracting the trigger when pressure is released.

Extending forwardly from the top of the hollow body is a barrel containing the operating elements. Within the barrel is fixed a cylindrical elongated bearing through which a push rod for a piston is intended to operate horizontally. The upper end of the armature contacts the rear end of the push rod for the piston during the operation thereof. A suitable spring connected to the piston retracts it rearwardly. In the front of a barrel is a sleeve having a central opening and a valve seat on which a spring pressed ball is adapted to seat. A transverse opening in the sleeve behind the seat allows liquid to be drawn into the same to be ejected past the seat. A nozzle embraces the forward end of the sleeve and is threaded into the front end of the barrel.

In the accompanying drawing constituting a part hereof, and in which like reference characters indicate like parts,

Fig. 1 is a side elevational view of a spray gun made in accordance with the present invention, some parts being cut away for clearness;

Fig. 2 is a fragmentary front elevational view of a spray gun shown in Fig. 1;

Fig. 3 is a vertical cross-sectional view thereof taken along the line 3-3 of Fig. 2 and Fig. 4 is a fragmentary, vertical cross-sectional view of a modified form of a spray gun.

Hollow body I which is roughly rectangular in cross-section is provided with a cover 2 held by screws 3. An electromagnet 4 within body I has poles 5 extending rearwardly, as shown in Figs. 1 and 3. A ledge 6 in the bottom of body I provides means for a vertically placed armature I to rest when the device is not in operation. An overhanging portion 8 at the top of body 1 just above armature 1 provides a stop for limiting the motion of the upper end 9 of the armature. An adjustable set screw l0 allows adjustment of 3 the length of horizontal movement of armature I. Bumper I in the inner end of screw I0 is adapted to absorb the shock of the impact of armature 9 in its movements.

At the lower end of body I and integral thereunder is a rearwardly extending handle II within which the switch I2 is held. A cover .2 which may beintegral with cover 2 is held in position on the handle by screws 3'. Blade I3- of switch I2 has a pin I4 extending outwardly from the top of handle II. Wires I5 extending from a source of current pass into the lower end of the handle through an opening (not shown) and are connected to switch I2 and magnet-4. A trigger I6 ispivoted at H to the lower front endlof body =I and is provided at the lower end with a finger grip I8.

Extending forwardly from the top of body I is a barrel l9 having a fin integral therewith, the latter being formed with hook 2! providing means for hanging the device from a suitable support. The position of hook 21 is such that When the assembly is made, it is'hung at approximatelythe center of gravity thereof either when not in operation or evenwhen in use.

The barrel has a horizontalbore 22 at the rear portion thereof witha shoulder '23 at an intermediate portion so that bore 24 in the front of the barrel is of larger diameterthan bore 22. An elongated cylindrical bearing-member -25 orpush rod guide .is fixed 1into bore22. A push rod26 contacts apiston 26and fits snugly in the bearing for reciprocation therein. A coil spring 21 surrounds the rear of piston 26 and retracts the same after actuation by armature I.

A sleeve. 28in bore 24contacts soft-metal washer 29 at shoulder 23. It has a central bore or cylinder .30 witha transverse opening 3I communicating with an external groove 32 on the face thereof. Front end of piston 26 is slidable in the cylinder past opening I The front of bore .30 is enlarged :as shown at 33, the junctionforming.a-shouldcr 34 constituting a'valve seat. Ball .35 biased rearwardly by coil spring 3.6 fits on seat 34. Nozzle .31 having a jet 38 in a. central portion thereof-and ahollow body portion is adapted to embrace the front end 39 of sleeve 28 and.forms a stop for the end of spring :36. Nozzle .31 is externally threaded and fits into cooperating .threadsat the .forward end of barrel .I9, A softmetal .washer provides a seal at the junction-of nozzle 3 'I-and sleeve28.

A downwardly extending tube 40 is fitted into screw M which is threadedat 42 into the' unclerside of barrel I9. Space 43 above tube '40 communicates with groove 232. Cap 44 which is internally threaded is united with barrel .I9 and pipe 40 held .in position as shown in Fig. 3 by screw 4|. A container -45 such ,as a can or jar having the neck externally threaded and carrying the liquid to be sprayed is threaded into cap 44.

In the operation of the device the liquid is placed in container which is screwed into cap 44. Wires .I5 are connected to a sourceof current and the operatorgrasps handle 12 with his finger on grip I8, Upon pressing the grip, the circuit is closed through switch.l2, causing rapid shifting of armature 'I from leftto right. There is hampering of the movement because the armature in effect floats in the space itoccupies. At each stroke to the right, it impinges on 2626, moving it forward-and causingliquid in thebore to be ejected past ball and out of nozzle 38. Then armature .I is retracted by the force of spring 21 and ball 35 is seated by spring35.

stream is obtained.

'When it is desired to clean or repair the device, it is merely necessary to unscrew nozzle 31, whereby the ball 35 and spring 36 may be removed by shaking sleeve 28 which is also readily removable. "Piston'26 and spring 21 may be removed by turning the front of barrel I9 downwardly and gently shaking the gun, whereby the piston 26 and its attached spring 21 will fall out. For

cleaning'tube lfl and associated parts, it is merely necessary to remove screw M. A drain 46 allows liquid from bore 22 to flow back into container 45.

In Fig. 4, there is shown a modification in which tube '48 is fixed into opening 3| of sleeve 28. To permit ready'removalof the sleeve and attached tube from the spray gun, avertical slot 41 is formed in the lower portion of the front end of barrel I9. After the removal of cap 44 and nozzle 31, sleeve 28 and tube 40 may :be slipped out of the end of the gun.

Although the'invention has been described setting forth a single specific embodiment-thereof, various changes in the details of construction may be made within the :principles herein set forth. The invention is, therefore, to be broadly construed and not to be limited except by the claims appended hereto.

I claim:

1. A spray gun comprising'a hollow body, an electromagnet therein, an armature adjacent the rear of said magnet and extending upwardly, a handle extending from the lower portion of said body, a switch in said handle, a trigger'for manually operating said switch, electrical connections between said switch, magnet and :a source of electricity, a barrel extending horizontally from the'top 'of said .body in alinement with the upper end of said armature and above the top of said magnet, a piston therein, said armature adapted to :contact said piston, :rneans secured to the lower side of the front .portion of said barrel for holding a depending container, and means associated with said piston forspraying fiuid'at the outer end of said barrel.

2. A spray gun comprising a hollow .body,.an electromagnet therein, anarmature adjacent the rear of said magnet and extending upwardly, :a handle extending from thelower portion of said body, aswitch in said handle, a trigger for manually operating saidswitch pivoted .at the lower portion of said body, electrical connections between said switch, magnet and a source of electricity, a barrel extending horizontally from the top of said body-in alinement-with the upper end of said armature and above the top of said magnet, a piston, means secured to the lower side of the front portion of said barrel for'holding a depending container therein, said arma ture adapted to contactsaid piston, and means associated with said piston for spraying fluid at the outer end of said barrel.

3. A spray gun comprising a hollow body, an electromagnet therein,.an armatureadjacent the rear of said magnet and extending upwardly, a ledge in said body on which said armature lies, a handle :extending from the lower portion of said body, a switch in said handle, a trigger for manually -.operating said switch, electrical connections between said switch, magnet and a source of electricity, a barrel extending horizontally from the top of said body in alinement with the upper end of said armature and above the top of said magnet, a piston, means secured to the lower side of the front portion of said barrel for holding a depending container therein, said armature adapted to contact said piston, and means associated with said piston for spraying fluid at the outer end of said barrel.

4. A spray gun comprising a hollow body, an electromagnet therein, the poles of said magnet extending horizontally, an armature adjacent the rear of said magnet and extending upwardly, a handle extending from the lower portion of said body, a switch in said handle, a trigger for manually operating said switch, electrical connections between said switch, magnet and a source of electricity, a barrel extending horizontally from the top of said body in alinement with the upper end of said armature and above the top of said magnet, a piston, means secured to the lower side of the front portion of said barrel for holding a depending container therein, said armature adapted to contact said piston, and means associated with said piston for spraying fluid at the outer end of said barrel.

5. In a spray gun, a barrel, a piston therein, a nozzle at one end and means for actuating said piston at the other end thereof, a removable sleeve having a valve seat therein in said barrel adjacent said nozzle, a ball valve contacting said seat, a spring in said sleeve bearing on said valve, said nozzle having a hollowed portion threaded into said barrel, the outer end of said sleeve fitted in said hollow, washers at both ends of said sleeve, one of said Washers contacting a shouldered portion of said barrel and the other washer contacting the inner end of said nozzle, an opening in the face of said sleeve rearwardly of said valve and a tube attached to said barrel in communication with said opening, the free end of said tube adapted to be immersed in fluid to be sprayed.

6. In a spray gun, a barrel, a piston therein, a nozzle at one end and means for actuating said piston at the other end thereof, a removable sleeve having a valve seat therein in said barrel adjacent said nozzle, a ball valve contacting said seat, a spring in said sleeve bearing on said valve, an opening in the face of said sleeve rearwardly of said valve and a circumferential groove in said sleeve at said opening, a tube attached to said barrel in communication with said opening, the free end of said tube adapted to be immersed in fluid to be sprayed.

7. In a spray gun, a barrel, a piston therein, a nozzle at one end and means for actuating said piston at the other end thereof, a removable sleeve having a valve seat therein in said barrel adjacent said nozzle, a ball valve contacting said seat, a spring in said sleeve bearing on said valve, an opening in the face of said sleeve rearwardly of said valve and a tube attached to said barrel in communication with said opening, the free end of said tube adapted to be immersed in fluid to be sprayed, an elongated bearing fixed in the central portion of said barrel, a pushrod fitted therein and extending from both ends, said pushrod having one end in contact with one end of said piston.

8. In a spray gun, a barrel, a piston therein, a nozzle at one end and means for actuating said piston at the other end thereof, a removable sleeve of uniform diameter in which said piston slides, an enlargement at the front of said sleeve, said enlargement having a valve seat therein in said barrel adjacent said nozzle, a ball valve contacting said seat, a spring in said sleeve bearing on said valve, an opening in the face of said sleeve rearwardly of said valve and a tube attached to said barrel in communication with said opening, the free end of said tube adapted to be immersed in fluid to be sprayed, an elongated bearing fixed in the central portion of said barrel and extending rearwardly therefrom, a separate pushrod for a pushrod fitted therein and extending from both ends, said pushrod having one end in contact with one end of said piston, and a spring at the nozzle end of said piston biasing the same rearwardly, a body rearwardly of said barrel into which said bearing extends, a magnet below said bearing in said body, a horizontally movable armature rearwardly of said magnet and extending above the same, said piston being in axial alinement with the top of said armature.

9. A spray gun comprising a hollow body, an electromagnet therein, an armature adjacent the rear of said magnet and extending upwardly, a handle extending from the lower portion of said body, a switch in said handle, a trigger for manually operating said switch, electrical connections between said switch, magnet and a source of electricity, a barrel extending horizontally from the top of said body in alinement with the upper end of said armature and above the top of said magnet, a piston therein, a pushrod in axial alinement with said piston, means secured to the lower side of the front portion of said barrel for holding a depending container, said armature adapted to contact said rod, and means associated with said piston for spraying fluid at the outer end of said barrel.

10. In a spray gun, a barrel, a piston therein, a nozzle at one end and means for actuating said piston at the other end thereof, a removable sleeve having a valve seat therein in said barrel adjacent said nozzle, a ball valve contacting said seat, a spring in said sleeve bearing on said valve, an opening in the face of said sleeve rearwardly of said valve and a tube fixed in said opening, the free end of said tube adapted to be immersed in fluid to be sprayed, said barrel having a slot extending from the front end thereof to said tube, said slot adapted to permit the removal of said sleeve and tube as a unit from said barrel.

FORREST M. DUNCAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,464,419 Gill Aug. 7, 1923 1,556,513 Fee Oct. 6, 1925 1,881,963 Perrin Oct. 11, 1932 2,195,929 Klett Apr. 2, 1940 2,410,692 Strobell Nov. 5, 1946 2,494,837 Simmons Jan. 17, 1950 2,508,950 Kaplan May 23, 1950