US2748992A

US2748992A - Spraying device

Info

Publication number: US2748992A
Application number: US297332A
Authority: US
Inventors: August H Pinke; Kenneth H Meeker; John E Oys; Robert C Hudson
Original assignee: HD Hudson Manufacturing Co
Current assignee: HD Hudson Manufacturing Co
Priority date: 1952-07-05
Filing date: 1952-07-05
Publication date: 1956-06-05
Anticipated expiration: 1973-06-05

Description

June 5 1956 A. H. PlNKE ET AL 2,748,992

SPRAYING DEVICE Filed July 5, 1952 2 SheetsSheet 1 June 5, 1956 A. H.'PlNKE ET AL SPRAYING DEVICE Filed July 5, 1952 2 Sheets-Sheet 2 Ewe/d0;

United States Patent 1 2,748,992 SPRAYING DEVICE August H. Pinke, Kenneth H. Meeker, and John E. Oys,

Hastings, Minn., and Robert C. Hudson, Glencoe, IlL,

assignors to H. D. Hudson Manufacturing Company,

Chicago, Ill., a corporation of Minnesota Application July 5, 1952, Serial No. 2%,332 14 Claims. (Cl. 222-402) The present invention relates to an apparatus for spraying and dispensing under relatively high pressure a liquid or fluid such as insecticides, pesticides, agricultural chemicals, whitewash, paints and other spraya-ble solutions, and more particularly to a novel manually operated compression sprayer of the portable type adapted to contain -a substantial quantity of a spraying solution and which may be readily carried about by the user and quickly made available for use.

Manually operated sprayers of this general type are provided with a self-contained pressure pump projecting into the container or tank supplied with the spraying solution, the pump being adapted to be manipulated by hand to build up sufficient pressure in the container or tank whereby the contained spraying solution may be dispensed through the spray nozzle of a spray hose or discharge line with which the container or tank is equipped. This spray hose or discharge line is preferably provided with a manually-actuated valve for effectively controlling the spray and said nozzle permitting the user to direct this spray wherever desired or required.

iIn the present novel embodiment, the pump including the pump cylinder and its plunger are removably or detachably mounted in the fill opening in the container or tank for supplying the latter with the spraying solution, and when the pump is replaced in the top opening in the tank, novel cam locking means are provided for closing the open end of the container or tank by engaging the flanged upper end of the cylinder of the pump in tight sealing contact with the encompassing surface at the open end of the container or tank.

Another important object of the present invention is the provision of a novel handle on the end of the pump plunger and a novel closure provided with radial projecting camming arms on the upper end of the pump cylinder adapted to be rotated by the handle with its camming ends engaging complementary camming surfaces on the upper, enlarged open end of the container or tank for causing looking and sealing engagement between the pump cylinder and the container or tank. This handle and the closure are provided with interengaging and interlocking parts whereby after the handle has been manipulated to actuate or reciprocate the plunger and build up a desired pressure in the container or tank, turning the handle in its lowered position causes this handle to be interlocked with the closure and its camrning arms whereby the user may lift and carry the entire assembly by merely grasping the handle.

Another and very important object of the present invention is the provision of a novel safety arrangement which most effectively overcomes a highly objectionable and dangerous feature in prior types of compression sprayers of the so-called funnel type. In such prior types of sprayers, the pump barrel or cylinder of the removable pump assembly is of a substantially uniform diameter throughout and but slightly less than that of the filler opening in the tank or container receiving the pump. As there is no adequate provision for the escape of air due to such closeness of fit whereby to relieve the internal pressure in the tank or container prior to release of the locking means, the pump and associated parts could, due to the pressure trapped within the tank, be unexpectedly and forcibly ejected from the filler opening with possible injury to the user or operator of the sprayer.

Patented June 5, 1956 ice In the present novel invention, the above recited danger inherent in such prior sprayers has been eliminated by providing the pump barrel with an enlargement at its upper or outer end adjacent the encompassing sealing gasket, which enlargement is conformably received within and but slightly less in diameter than the filler opening and provided with a downwardly tapered reduction merging into the smaller cylindrical body of the barrel. The eilective length of such enlargement is somewhat less than the depth of rise in the cam locking surface on the upper, enlarged end of the tank, whereby to assure release of the internal air pressure in the tank about the tapered or reduced portion of the barrel before the cam locking means is disengaged.

A further and important object of the present invention is the provision of a novel construction and arrangement of the handle and operating valve whereby to facilitate operation of the sprayer. in the present embodiment, the handle is provided with novel locking means whereby when this handle is moved to its lowered or depressed position for the spraying operation after the piston has been operated and sufficient pressure has been built up thereby in the tank or receptacle containing the spraying solution, it is locked and held in alignment with the valve controlling the discharge from the sprayer whereby the operator may readily carry the sprayer about with one hand and with the thumb of that same hand actuate the valve. This novel arrangement and combination greatly facilitates operation and permits the operator to most effectively control and direct the spray from the nozzle or discharge end of the spray hose.

Further obiects are to provide a construction of maximum simplicity, efiiciency, economy and ease of assembly and operation, and such further objects, advantages and capabilities as will later more fully appear and are inherently possessed thereby.

In the drawings:

Figure "l is a view in side elevation of the novel spraying device, the discharge or nozzle end of the spray hose being bro-ken away.

'Fig. 2 is a fragmentary view in side elevation of the upper end of the tank or container with its enlarged or cupped open end, the upper end of the pump cylinder, and the operating handle mounted on the outer end of the piston rod and plunger of the pump moved to an elevated position for operating the plunger to build up pressure in the tank or container.

Fig. 3 is a fragmentary view in side elevation of the handle and the pump cylinder and closure assembly removed from the tank or container, the handle being shown in its lowered position.

Fig. 4 is a view in end or side elevation of the assembly of Fig. 3 rotated through an arc of approximately from the posit-ion there shown and partially removed from the tank or cylinder, the enlarged top or open end of the tank or container being broken away for more complete disclosure of the camming surfaces at the top of its open end.

Pig. 5 is an enlarged view in vertical cross section through the open, enlarged end of the tank or container, the cam lock and closure for sealing the tank or container against leakage of the spraying solution and the air pressure and the locking means for retaining the handle in fixed position during spraying, the View being taken in a plane represented by the line 5-5 of Fig. 6.

Fig. 6 is a view in horizontal cross section taken in a plane represented by the line 6-6 of Fig. S.

Fig. 7 is a top plan view of the tank or container, the pump cylinder and the cover or closure therefor with its carnming arms rotated by the handle to depress this cover or closure and thereby seal the tank or container, and

with the handle locked against rotation or vertical dis placement.

Figs. 8, 9, 10, ll and l2 are views similar to F1gs. l, 2, 3, 4 and 5 respectively, but showing a modified construction.

Fig. 13 is a top plan view of the tank or container, the pump assembly and the handle of the embodiment in Figs. 8 to 12 inclusive, the cover or closure for the cylinder having been rotated and cammed to sealing position by the handle and with the handle being broken away above its depending lugs.

Referring more particularly to the disclosure in the drawings and to the novel illustrative embodiment of Figs. 1 to 7 inclusive, the present novel sprayer comprises a tank or container 10 adapted to receive a substantial quantity of a sprayable solution including any of the insecticides, pesticides, agricultural chemicals, whitewash, paints or other liquids or fluids capable of being sprayed or dispensed under pressure. This tank or container is preferably of a metal or material capable of withstanding the pressure to which it is subjected in use and which metal or material is unaffected by the composition of the contained sprayable solution.

At its upper end the tank or container 10 is provided with a reduced neck 11 having a filling opening defined by an annular flange .12 forming a seat for a gasket or sealing ring 13, and an outwardly and upwardly flared enlargement 14 for facilitating pouring of the sprayable solution into the container or tank without spillage. At its upper edge this enlargement is flanged inwardly at 15 to form spaced or interrupted and inclined cumming surfaces 16 adapted to receive therebeneath the inclined cam surface 17 at the outer, elevated end of a pair of arms 18 carried by and projecting radially outwardly from a central closure or cover 19 adapted to seat upon and having 21 depending flange 29 adapted to engage over and encompass the upper enlarged and flanged end 21 of a pump cylinder 22 channelled at 23 to receive and retain the depending gasket or sealing ring 13.

The inclined cumming surfaces 17 on the radially projecting arms or projections 18 on the closure or cover 19 and the complementary, inclined camming surfaces 16 on the inwardly flanged upper edge 15 of the container or tank 10, depress the closure and compress the sealing ring or gasket 13 into air and liquid'tight sealing engagement with the flange seat 12 defining an opening 24 in the tank or container It whereby to prevent leakage between the adjoining surfaces of the pump cylinder 22 and the tank or container 10.

The pump cylinder is adapted to receive a plunger including a piston rod 25 carrying at its lower end a piston of any desired construction; for example, as shown in the De Frees Patent No. 2,248,814, granted July 8, 1941, or as shown in the Winks et al. Patent No. 2,529,645, granted November l4, i950. The lower end of the pump cylinder 22 is provided with a suitable check valve which may be of the type shown in either of the above mentioned patents to permit the discharge of air by the pump piston into the tank or container 10 to build up pressure therein and prevent the reverse flow of the contained liquid or spraying solution as well as the air into the pump cylinder.

Suitably secured or aiflxed to the upper end of the piston rod 25 by a pin or the like 26 is a handle 27, the lower end 28 of which is provided with oppositely disposed depending lugs 29 each provided with an outwardly disposed flange or projection 31 adapted to he received in arcuate slots 32 in the closure of cover 19. These slots which open into the upper end of the pump cylinder 22, are each provided with an intermediate offset or enlargement 33 to permit the passage therethrough of the end of the flanges or projections 31 (see Figs. 5 and 6), but with the remainder of the slots 32 of less width so as to retain the flanges or projections against the adjacent underside of the cover or closure 19. Thus when the flanges or projections are aligned with the ofl'set 33 in the slots 32,

the handle may be vertically withdrawn or, if withdrawn, the flanges 31 may be projected through the slots 32 and otfsets 33 and then upon turning movement of the handle the flanges or projections 31 on the lugs 29 will be positioned beneath the margins of the narrow portions of the slots 32 whereby the handle is locked to the cover or closure 19 and cannot be pulled away or withdrawn there from without again turning the handle to align the flanges or projections 31 with the offsets 33 in the slots 32.

When these parts are in the position shown in Figs. 5 and 6, with the pump cylinder 22 inserted into its operative, depending position in the tank with the gasket or sealing ring 13 positioned upon the annular flange or seat 12 of the tank or container 10, rotation of the handle 27 in a clockwise direction causes the lugs 31 to engage the cover or closure 19 at the end of the slots 32 and thereupon continued rotation of the handle carries along this cover or closure and its arms 18 with the lower inclined edge 34 of the camming surface 17 of each arm 18 entering beneath the elevated inclined end 35 of each of the spaced, camming surfaces 16 on the interrupted, inturned flange 15. Continuing such turning effort of the handle 27 carrying the cover or closure 19 causes the latter to be pressed or forced downwardly onto the channelled upper or outer end 23 of the pump cylinder 22 whereby the sealing gasket or ring 13 is compressed against the rigid flange seat 12 on the container or tank and encompassing its opening 24. This construction and arrangement provides a most etfective seal to prevent the escape of air or spraying solution from the container or tank.

When the parts are in sealing engagement, the handle of the pump may then be operated to build up sutficient pressure in the tank or container 10 to permit continuous or interrupted spraying for a substantial period of time. When made ready for spraying, the handle 27 is preferably locked against release as shown in Figs. 1, 5 and 7. To accomplish such locking the handle is provided with a laterally extending, tubular projection 36 carrying a plunger 37 provided with a locking pin or detent 38 adapted to project through the open end of the tubular projection 36 and into an aligned opening 39 (Fig. 5) in the flared enlargement 14 of the tank or container. This plunger 37 and its locking pin or detent 38 are spring-biased to retracted position by a coil spring 40 but movable against this compression spring and adapted to be held in extended, locked position by a laterally or radially extending stud 41 carried by the plunger 37 and projecting through a longitudinally extending slot 42 in the encompassing tubular projection 36. This stud is provided with a knurled end 43 adapted to be grasped and manually moved to the outer end of this slot 42, whereupon the pin or detent 38 enters the aligned opening 39 in the flared enlargement 14 and the stud is latched or locked in that extended position by moving the stud 41 laterally into a transverse or cross slot 44.

In this locked position the handle 27 is aligned with a pivoted valve-actuating member or trigger 45 for controlling the fiow of spraying solution under pressure through the outlet 46 from the tank or container 10, through the valve 47 and through the spray hose 48, whereby the operator or user can readily carry the tank or container 10 about and with the thumb of that same hand actuate the trigger or valve-actuating member 45 for the valve 46, and with the other hand direct the nozzle on the end of the spray hose 48 over the area to be sprayed.

When the pin or detent 38 is disengaged, the handle may be raised and lowered to manipulate the pump to build up pressure in the tank, or the handle 27 may be rotated in a counterclockwise direction whereby the lugs 31 will engage the cover or closure at the opposite end of the slots 32 and thereupon rotate and carry along therewith the cover or closure 19 and its radially projecting arms 18. Moving these members in a counterclockwise direction causes the complementary,

inclined camming surfaces

16 and 17 on the inturned, interrupted flange 15 on the container or tank and on the arms 18, respectively, to release the gasket 13 from ssaling engagement with the tank or container and permit exhaust of any air pressure built up in the tank. Thereafter the handle and pump assimbly may be removed for refilling or for access to the tan To permit the exhaust of internal air pressure trapped within the tank or container before the cam-locking means becomes disengaged or released and thereby prevent any entrapped air pressure from forcibly dislodging the removable pump assembly with its barrel or cylinder 22, handle 27 and associated parts including the cover 19 and its camming arms 18, and unexpectedly ejecting this assembly from the filler opening of the tank or container 10, the pump barrel or cylinder 22 is provided at its upper open end with an enlarged neck or collar 49 conformably received within and of but slightly less diameter than the filler opening and connected by an inwardly and downwardly tapered portion 50 to the smaller circumference of the body of the barrel 22.

The effective length of this upper enlargement 49 of the depending body of the barrel or cylinder 22 below the sealing face of its encompassing gasket 13, is such that as the cam-locking means is being released and the cam arms 18 travel upwardly with the rise of the cam surfaces 16 on the tank or container 10, the pump assembly rises a like amount to normally withdraw the gasket 13 from its seat on the internal flange 12 and to locate the tapered portion of the barrel of substantially less diameter than the filler opening within this opening, whereby the pressure in the tank or container is relieved through the annular escape space about the tapered enlargement 50. Should the sealing face of the gasket 13 have a tendency to stick toits seat, it will be readily disengaged by the trapped pressure seeking to escape from the tank from between the flanged seat 12 and the sealing face of the gasket 13.

As clearly disclosed in Fig. 5, the upper neck 49 of the pump barrel or cylinder with its flanged end 21 carries the gasket 13 and to prevent this gasket from being pinched or extruded between the flange or seat 12 defining the filler opening and the adjacent surface of the pump barrel, the neck or enlargement 49 of the barrel is of but slightly less diameter than that of the filler opening and of such length that when the pump and its barrel are slightly elevated by the entrapped pressure in the tank or container upon the initial movement of the cam arms 18 from locked position toward unlocked position, the tapered enlargement enters the filler opening to provide a substantially larger annular escape area for the entrapped air and by the time the cam arms 18 reach the raised position 35 of the camming surfaces 16 on the flanged upper end of the tank or container, the pressure in the tank is relieved.

Figs. 9 to 13 inclusive, disclose a tank or container 10 having a flared enlargement 14 provided with an inturned flange 15 providing spaced inclined camming surfaces 16, and complementary inclined camming surfaces 17 on the elevated outer ends of radially extending arms 18 secured or affixed to a cover or closure 19. In this embodiment, the parts are constructed and arranged, sealing its accomplished and entrapped pressure is relieved upon disengagement of the cam locking means, all in a manner similar to that shown in the embodiment of Figs. 1 to 8 inelusive. However, unlike the handle 27, the handle 51 of this alternate form is not locked or latched to the flared enlargement 14 of the tank or container 10 during the spraying operation. In other respects, this handle 51 is similar in that it is attached to the piston rod by a pin 26 in the same manner as previously described, and the lower end of the handle is provided with oppositely arranged depending lugs 29 each provided with an outwardly directed projection or flange 31 adapted to be received in the offsets 33 of the spaced arcuate slots 32, the

offsets 33 permitting the insertion or removal of these projections or flanges 31 when aligned therewith and the slots 32 permitting the cover or closure 19 and its cam arms 18 to be rotated to force this cover or closure downwardly and cause sealing engagement between the upper end of the pump cylinder 22, the gasket 13 and the interior of the tank or container 10.

Having thus disclosed the invention, we claim:

1. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution, a pump having a cylinder adapted to be removably mounted in the opening, sealing means carried by the upper end of the cylinder and a seat provided in the tank about the access opening, a closure seating on the upper end of the cylinder, camming arms carried by the closure having inclined camming surfaces on the outer end of these arms, and spaced inturned and arcuate flanges on the enlarged upper end of the tank each provided with an inclined camming surface whereby rotation of said arm and closure in one direction causes the inclined camming surfaces on the arms to engage the inclined camming surfaces on the arcuate flanges of the tank forcing the closure against the upper end of the pump cylinder to compress the sealing means and seal the interior of the tank against the escape of pressure or spraying solution, said cylinder below its upper end being constricted whereby as the closure and camming arms are rotated in the opposite direction toward release position and these arms and the closure travel upwardly with the inclined camming surfaces on the upper end of the tank, the upper end of the cylinder is raised, the sealing means is withdrawn from the seat, and air within the tank is rapidly released about the constriction.

2. A spraying device comprising a tank having an en larged upper end provided with an access opening for a spraying solution, a pump having a cylinder adapted to be removably mounted in the opening and provided with an outwardly and downwardly flanged upper end, a sealing gasket in said flanged upper end and a seat provided in the tank about the access opening, a closure seating on the flanged upper end of the cylinder, radially projecting camming arms on the closure having inclined camming ends, spaced arcuate flanges on the enlarged upper end of the tank each provided with an inclined camming surface whereby rotation of said arms and closure in one direction causes the inclined camming ends on the arms to engage the inclined camming surfaces on the arcuate flanges of the tank forcing the closure against the upper end of the pump cylinder to compress the sealing gasket and seal the interior of the tank against the escape of pressure or spraying solution, said cylinder below its upper end being tapered inwardly whereby as the camming arms are rotated in the opposite direction to release the closure from sealing engagement and the upper end of the cylinder travels upwardly with the arms and closure to withdraw the sealing gasket from its seat, air

ithin the tank is relieved about the inwardly tapered portion, and a handle on the pump having depending lugs adapted to be received in slots in the closure for rotating the closure and its arms.

3. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution and an encompassing seat, a pump having an operating handle and a cylinder detachably mounted in the opening, sealing means carried by the upper end of the cylinder and adapted to engage the seat about the access opening, a cover seating on the upper end of the cylinder, spaced camming arms carried by the cover with each arm having an inclined camming surface on its outer end, and spaced, inturned and arcuate flanges on the enlarged upper end of the tank each provided with an inclined camming surface adapted to receive therebeneath the inclined camming surface on the end of an arm whereby rotation of said arms and cover in one direction causes the inclined camming surfaces on the arms to engage beneath the inclined camming surfaces on the arcuate flanges of the tank forcing the cover against the upper end of the pump cylinder to compress the sealing means against the seat and seal the contents of the tank against leakage, said cylinder below its upper end being constricted whereby as the cover and camming arms are rotated in the opposite direction toward release position and these arms and the cover travel upwardly with the inclined camming surfaces on the upper end of the tank, the upper end of the cylinder is raised, the sealing means is withdrawn from its seat and air within the tank is rapidly released about the constriction.

4. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution and an encompassing seat, a pump having an operating handle and a cylinder detachably mounted in the opening, sealing means carried by the upper end of the cylinder and adapted to engage the seat about the access opening, a cover seating on the upper end of the cylinder, spaced camming arms carried by the cover with each arm having an inclined camming surface on its outer end, spaced, inturned and arcuate flanges on the enlarged upper end of the tank each provided with an inclined camming surface adapted to receive therebeneath the inclined camming surface on the end of an arm whereby rotation of said arms and cover in one direction causes the inclined camming surfaces on the arms to engage beneath the inclined camming surfaces on the arcuate flanges of the tank forcing the cover against the upper end of the pump cylinder to compress the sealing means against the seat and seal the contents of the tank against leakage, arcuate slots provided in the cover and depending lugs on the handle adapted to be received in the slots and when the handle is turned in one direction it rotates the cover and its camming arms to scaling engagement and when the handle is turned in the opposite direction the cover and its camming arms are rotated to release the cover from sealing engagement and permit the complete withdrawal of the pump from the tank for access to the opening, said cylinder at its upper end being conformably received in the access opening and beneath this upper end being constricted so that as the handle is turned in the opposite direction to release the cover and withdraw the sealing means from its seat about the access opening air is relieved about the constriction.

5. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution and an encompassing seat, a pump having an operating handle and a cylinder detachably mounted in the opening, sealing means carried by the upper end of the cylinder and adapted to engage the seat about the access opening, a cover seating on the upper end of the cylinder, spaced camming arms carried by the cover with each arm having an inclined camming surface on its outer end, spaced, inturned and arcuate flanges on the enlarged upper end of the tank each provided with an inclined camming surface adapted to receive therebeneath the inclined camming surface on the end of an arm, arcuate slots provided in the cover and depending lugs on the handle adapted to be received in the slots and when the handle is turned in one direction it rotates the cover and its camming arms to sealing engagement and when the handle is turned in the opposite direction the cover and its camming arms are rotated to release the cover from sealing engagement and permit the complete withdrawal of the pump from the tank for access to the opening, said cylinder at its upper end being conformably received in the access opening and beneath this upper end being constricted so that as the handle is turned in the opposite direction to release the cover and withdraw tl. sealing means from its seat about the access opening air is relieved about the constriction and means for locking the handle to the tank when the cover is sealed and pressure has been built up in the tank ready for spraying.

6. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution, a pump having a cylinder adapted to be removably mounted in the opening, sealing means carried by the upper end of the cylinder and a seat provided in the tank about the access opening, a closure seating on the upper end of the cylinder, camming arms carried by the closure having inclined camming surfaces on the outer end of these arms, spaced inturned and arcuate flanges on the enlarged upper end of the tank each provided with an inclined camming surface whereby rotation of said arms and closure in one direction causes the inclined camming surfaces on the arms to engage the inclined camming surfaces on the arcuate flanges of the tank forcing the closure against the upper end of the pump cylinder to compress the sealing means and seal the interior of the tank against the escape of pressure or spraying solution, a handle for operating the pump to build up pressure in the tank and having depending lugs for engaging and rotating the closure and camming arms to sealing engagement when rotated in one direction, and when rotated in the other direction the closure and its camming arms are rotated to release the closure from sealing engagement and permit the withdrawal of the pump from the tank, said cylinder at its upper end being conformably received in the access opening and constricted so that as the handle is turned in the opposite direction to release the closure and withdraw the sealing means from its seat about the access opening air is relieved about the constriction, and means for locking the handle to the tank when the closure is sealed and pressure has been built up in the tank preparatory to spraying.

7. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution, a pump having a cylinder adapted to be removably mounted in the opening and provided with an outwardly and downwardly flanged upper end, a sealing gasket in said flanged upper end and a seat provided in the tank about the access opening, a closure seating on the flanged upper end of the cylinder, radially projecting camming arms on the closure having inclined camming ends, spaced arcuate flanges on the enlarged upper end of the tank each provided with an inclined camming surface whereby rotation of said arms and closure in one direction causes the inclined camming ends on the arms to engage the inclined camming surfaces on the arcuate flanges of the tank forcing the closure against the upper end of the pump cylinder to compress the sealing gasket and seal the interior of the tank against the escape of pressure or spraying solution, a handle on the pump having depending lugs adapted to be received in slots in the closure for rotating the closure and its arms, and a detent adapted to be received in an aligned opening in the enlarged upper end of the tank for locking the handle to the tank when the handle has moved the closure to a sealing position and pressure has been built up in the tank preparatory to spraying.

8. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution and an encompassing seat, a pump having an operating handle and a cylinder detachably mounted in the opening, sealing means carried by the upper end of the cylinder and adapted to engage the seat about the access opening, a cover seating on the upper end of the cylinder, complementary camming means on the cover and tank whereby rotating the handle rotates the cover and its camming means into camming relation with the complementary camming means on the tank to depress the cover against the upper end of the cylinder and cause the sealing means carried thereby to engage the seat and seal the contents of the tank, means including a sliding pin carried by the handle and adapted to be projected through an aligned opening in the enlarged upper end of the tank for locking the handle to the tank preparatory to spraying after the cover is sealed and the handle operated to build up suflicient pressure in the tank, a valve and actuating means therefor disposed adjacent to and in alignment with the handle when the latter is in locked position whereby the operator can carry the spraying device by the handle with one hand and with the thumb of that hand operate the actuating means for the valve to thereby control discharge of the spraying solution.

9. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution and an encompassing seat, a pump having an operating handle and a cylinder detachably mounted in the opening, sealing means carried by the upper end of the cylinder and adapted to engage the seat about the access opening, a cover seating on the upper end of the cylinder, means for forcing the cover against the upper end of the pump cylinder to compress the sealing means against the seat and seal the contents of the tank against leakage, arcuate slots provided in the cover and depending lugs on the handle adapted to be received in the slots and when the handle is turned in one direction it rotates the cover to sealing engagement and when the handle is turned in the opposite direction the cover is rotated to release the cover from sealing engagement and permit the complete withdrawal of the pump from the tank for access to the opening, a locking pin carried by and projecting laterally from the handle and movable into an aligned opening in the upper end of the tank for locking the handle to the tank preparatory to spraying after the cover is sealed and the handle operated to build up suficient pressure in the tank, and a valve-actuating trigger disposed in alignment with the locked handle whereby the operator may carry the spraying device by the handle with one hand and with that same hand operate the trigger of the valve for controlling the discharge of the spraying solution.

10. A compression sprayer comprising a tank having an enlarged upper end provided with a filler opening for a spraying solution, a pump for supplying air pressure to the tank and including a barrel removably mounted in the opening and provided with a neck portion at its upper open end adapted to be conformably received in the opening when the barrel is mounted in the tank, a gasket carried by the upper open end of the barrel and adapted to seat about the filler opening and seal the pressure within the tank, a cover for the upper end of the pump barrel, cooperating cam-locking means on the enlarged upper end of the tank and on the cover for retaining the gasket in sealing relation, and a constriction n the barrel directly beneath the neck portion for relieving entrapped pressure through the opening in the tank about the constriction as the cam-locking means is being released and with the entrapped pressure dislodges the neck portion of the barrel from the opening before the cam-locking means is released.

11. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution, a pump having a cylinder adapted to be removably mounted in the opening and provided with a relatively short neck at its upper end adapted to fit conformably in the opening when the cylinder is mounted in the tank, sealing means carried about the upper end of the cylinder and a seat provided in the tank about the access opening, a closure seating on the upper end of the cylinder, cam-locking means forcing the closure against the adjacent end of the cylinder to compress the sealing means and seal the interior of the tank, and a constriction on the cylinder below the neck and so related to the camlocking means as to relieve the entrapped pressure through the opening in the tank about this constriction as the cylinder is forced upwardly by release of the cam-locking means and the pressure in the tank whereupon the neck of the cylinder is dislodged from the opening before the cam-locking means is completely disengaged.

12. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution, a pump having a cylinder adapted to be removably mounted in the opening and provided with an outwardly and downwardly turned flange at the upper open end of the cylinder with the diameter of the cylinder at the upper end inwardly of said flange providing a reiatively short neck fitting conformably in the access opening, sealing means carried by said flange at the exterior of the upper end of the cylinder and a seat provided in the tank about the access opening, a closure seating on the upper flanged end of the cylinder, camlocking means forcing the closure against the adjacent end of the cylinder to compress the sealing means and seal the interior of the tank, and means coacting with said cam-locking means for relieving the entrapped pressure in the tank before the cam-locking means is disengaged, including a tapered reduction in the diameter of the cylinder beneath said neck and the neck being of such length that as the cam-locking means is being released but prior to its final release, movement of the cam-locking means toward release position and the pressure in the tank dislodges the neck of the cylinder from the access opening and the trapped pressure from the tank escapes through the opening and about the tapered reduction.

13. A compression sprayer comprising a tank having an enlarged upper end provided with a filler opening for a spraying solution, a pump for supplying air pressure to the tank and including a barrel removably mounted in the opening and provided with an outwardly projecting flange at the upper open end of the barrel with the portion of the barrel at this upper end inwardly of the flange providing a relatively short neck portion adapted to fit conformably within the access opening, a gasket carried by the flange at the upper open end of the barrel and adapted to seat about the filler opening and seal the pressure within the tank, cam-locking means for retaining the gasket in sealing relation, and means for relieving entrapped pressure in the tank before the cam-locking means is released, said means including a constriction on the barrel beneath the neck portion which is conformably received in the opening when the tank is sealed, said neck portion being of such length and so related to the camlocking means as to leave the opening and the pressure in the tank is relieved through the opening and about the constriction when the barrel is elevated in the opening by release of the cam-locking means and the trapped pressure.

14. A spraying device comprising a tank having an enlarged upper end provided with an access opening for a spraying solution, a pump having a cylinder adapted to be removably mounted in the opening and provided with an external flange projecting from the upper end of the cylinder with the upper end of the cylinder provided with a relatively short neck adapted to fit conformably in the access opening, sealing means carried by the external flange at the upper end of the cylinder and a seat provided in the tank about the access opening, a closure seating on the upper end of the cylinder, cooperating camlocking means on the enlarged upper end of the tank and on the closure forcing the closure against the adjacent end of the cylinder to compress the sealing means and seal the interior of the tank, and a tapered reduction in the diameter of the cylinder immediately below the neck and cooperating with said cam-locking means for relieving the entrapped pressure in the tank through the opening and about the reduction when the cylinder is elevated in the opening upon release of the cam-locking means but before the cam-locking means is disengaged.

References Cited in the file of this patent UNITED STATES PATENTS 715,982 Chapin Dec. 16, 1902 751,238 Tost Feb. 2, 1904 1,112,202 Estes Sept. 29, 1914 2,282,172 De Frees May 5, 1942