US3901449A - Cordless electric sprayer - Google Patents

Cordless electric sprayer Download PDF

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Publication number
US3901449A
US3901449A US447088A US44708874A US3901449A US 3901449 A US3901449 A US 3901449A US 447088 A US447088 A US 447088A US 44708874 A US44708874 A US 44708874A US 3901449 A US3901449 A US 3901449A
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US
United States
Prior art keywords
housing
pump
mounted
discharge equipment
tube
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
US447088A
Inventor
Carl E Bochmann
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HD Hudson Manufacturing Co
Original Assignee
HD Hudson Manufacturing Co
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
Priority claimed from AR25648274A external-priority patent/AR207455A1/en
Application filed by HD Hudson Manufacturing Co filed Critical HD Hudson Manufacturing Co
Priority to US447088A priority Critical patent/US3901449A/en
Priority claimed from IE1919/74A external-priority patent/IE39851B1/en
Priority claimed from AU73554/74A external-priority patent/AU479471B2/en
Priority claimed from MX175538A external-priority patent/MX147344A/en
Publication of US3901449A publication Critical patent/US3901449A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03Spraying 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
    • B05B9/04Spraying 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
    • B05B9/08Apparatus to be carried on or by a person, e.g. of knapsack type
    • B05B9/085Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump
    • B05B9/0855Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump the pump being motor-driven
    • B05B9/0861Apparatus 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/60Arrangements for mounting, supporting or holding spraying apparatus
    • B05B15/65Mounting arrangements for fluid connection of the spraying apparatus or its outlets to flow conduits
    • B05B15/652Mounting arrangements for fluid connection of the spraying apparatus or its outlets to flow conduits whereby the jet can be oriented

Abstract

An electric sprayer comprising a tank having a housing extending over portions of the tank and a piston pump extending into the tank. The pump has an inlet and an outlet. Discharge equipment including a spray nozzle is mounted to an exterior surface of the housing. The discharge equipment is connected to an elastomeric tube surrounded by a coil spring which, in turn, is connected to a slender elongated tube connected to the pump outlet. A motor driven by a set of rechargeable batteries is mounted in the housing and is connected to the pump. An on/off switch electrically interconnecting the batteries and motor is mounted to an exterior surface of the housing. The discharge equipment includes portions pivotally mounted to the housing exterior surface so as to permit movement between a first inoperative position wherein the discharge equipment shields the on/off switch to a second operative position wherein the switch is exposed.

Description

United States Patent Bochmann [4 1 Aug. 26, 1975 CORDLESS ELECTRIC SPRAYER [75] Inventor: Carl E. Bochmann, Brecksville,

Ohio

[73] Assignee: H. D. Hudson Manufacturing Primary Examiner-M. Henson Wood, Jr. Assistant ExaminerJohn J. Love Attorney, Agent, or Firm-Kane, Dalsimer, Kane, Sullivan and Kurucz 5 7 ABSTRACT An electric Sprayer comprising a tank having a housing extending over portions of the tank and a piston pump extending into the tank. The pump has an inlet and an outlet. Discharge equipment including a spray [52] US. Cl. 239/332; 239/333; 239/587 nozzle is mounted to an exterior surface of the hous- [51] Int. Cl. B05B 9/043 ing. The discharge equipment is connected to an elas- [58] Field of Search 222/385, 333, 382; tomeric tube surrounded by a coil spring which, in

239/331, 332, 587, 333 turn, is connected to a slender elongated tube connected to the pump outlet. A motor driven by a set of [56] References Cited rechargeable batteries is mounted in the housing and UNITED STATES PATENTS is connected to the pump. An on/off switch electril 140 453 5/1915 Frank 222/385 cally interconnecting the batteries and motor is 2647796 8/1953 mounted to an exterior surface of the housing. The 2:784:876 3 1957 Parkes 222/385 x discharge equipment includes Portions Pivotally 3,120,347 2/1964 Duke, Jr. 239/332 mounted to the housing eXteriOr Surface SO as to P 3,l73,584 3/1965 Giavasis 222/385 X mit movement between a first inoperative position 3,581.997 6/197] Stevenson 239/332 wherein the discharge equipment shields the on/off SWltCh t0 a Second operative position wherein the switch is exposed. 1,494,317 9/1967 France 239/332 3 Claims, 6 Drawing Figures 36 2 a? I .0 Hfi ]--'fa ,4 34 32 H H r I I a i I Z i: a

III

PATENTEI] AUG 2 6 I975 CORDLESS ELECTRIC SPRAYER BACKGROUND OF THE INVENTION The present invention relates to sprayers and more particularly to a cordless electric sprayer.

Sprayers find extensive use in commercial, industrial, and garden applications such as for the spraying of pesticides and the like on trees and shrubs. Because such sprayers must oftentimes be used in places far removed from convenient access to a source of electric power,

various non-electric spraying devices have been developed for such applications. The need has remained, however, for a convenient, portable, electrical garden spray device.

Thus, in view of the above, it is the principal object SUMMARY OF THE INVENTION The above and other beneficial objects are attained in accordance with the present invention by providing an improved cordless electric sprayer comprising a tank having a housing extending over portions of the tank. A piston pump extends into the tank. The pump has an inlet and an outlet. Discharge equipment including a spray nozzle is mounted to an exterior surface of the housing. The discharge equipment is connected to an elastomeric tube surrounded by a coil spring which, in turn, is connected to a slender elongated tube connected to the pump outlet. A motor driven by a set of rechargeable batteries is mounted in the housing and is operatively connected to the pump. An on/off switch electrically interconnecting the batteries and motor is mounted to an exterior surface of the housing. The discharge equipment includes portions pivotally mounted to the housing exterior surface so as to permit movement between a first inoperative position wherein the discharge equipment shields the on/off switch to a second operative position wherein the switch is exposed.

BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings:

FIG. 1 is a perspective view of an electricsprayer in accordance with the present invention;

FIG. 2 is a simplified perspective schematic of the pump and discharge equipment of the present electric sprayer;

FIG. 3 is a side elevational sectional view of the present electric sprayer;

FIG. 4 is a sectional view taken along reference lines 44 of FIG. 3 in the direction indicated by the arrows;

FIG. 5 is a sectional view taken along reference lines 55 of FIG. 3 in the direction indicated by the arrows; and

FIG. 6 is a fragmentary sectional view taken along reference lines 6--6 of FIG. 4 in the direction indicated by the arrows.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Reference is now made to the drawings wherein similar components bear the same reference numerals throughout'the several views. In FIG..1, the present electric sprayer 10 is shown comprising a tank 12 and housing 14. Asshown in FIG. 3, the tank 12 includes a neck portion 16 defining an opening through which the liquids to be sprayed can be poured into the tank interior. A closure 18 is provided for the opening.

A piston pump 20 extends into the tank through closure 18. The pump is driven by a-D-C motor 22 which, in turn, derives its power from a set of rechargeable nickel-cadmium batteries 24. The batteries and motor are mounted within the housing with the batteries connected through a suitable rectifying circuit (not shown) to terminal pins 26 which extend outside the housing. The terminal pins may be connected through a suitable ccn nector and cord to a source of line voltage to enable recharging of the batteries as required Batteries 24 are connected to motor 22 through sliding contacts 28, the connection being controlled by the position of switch 30 which extends through the top surface 32 of the housing through asuitable opening the housing. The function of this tube will be discussed in detail forthwith.

Referring to FIG. 1, it can be seen that the pivotal fitting 42 permits the wand 38 to be shifted from a first inoperative position wherein the wand overlies the top surface of the housing as shown to a second position wherein the'wand is pivoted away from the housing as shown in phantom. This is an important feature of the present sprayer since when the wand is in the inoperative position, it overlies switch 30 thereby shielding the switch from accidentally being pushed when the discharge equipment is in the storage position.

Referring to FIG. 2, it can be seen that motor 22 which may be a permanent magnet type D-C motor is provided with an eccentric pin 46 connected to the motor shaft 48. The eccentric pin 46 engages the ob ong opening 50 of a scotch yoke 52 thereby driving the yoke up and down in response to rotation of the shaft. The yoke 52 is connectedto a piston rod 54 disposed in a cylinder56 extending outwardly from the pump body 58. A sea] 60 rigidly mounted within the cylinder is in sealing engagement with the piston rod. An inlet port 62 and an outlet port 64 are defined in the pump body. A check valve 66 including ball 68 insures one-way flow of fluid from the tank into the body interior through the inlet port.

An elongated rigid slender tube 70 extends from the outlet port with one end connected to the port. The other end of tube 70 is connected to one end of a flexible elastomeric tube 72. The other end of tube 72, in turn, is connected to tube 44 which, in turn, is connected to the pivotal fitting 42. A coil spring 76 is wound about the elastomeric tube as shown.

Operation In normal operation, the shifting of switch 30 to an on position makes the appropriate connection to turn on motor 22 causing eccentric pin 46 to rotate. Eccentric pin 46 drives scotch yoke 52 and hence piston rod 54 in a vertical reciprocating fashion. The upward motion of the piston rod draws fluid into the pump body through check valve 66. Downward motion of the piston decreases the volume of the interior chamber of cylinder 56 and thus expels fluid through outlet port 64 into the elongated slender tube 70. The mass of fluid in tube 70 is traveling away from the pump body with some velocity. The momentum of the fluid in the tube is therefore the product of this mass and velocity. As the piston begins to rise, the volume of the chamber 74 beneath the seal increases. This increase in volume causes the fluid pressure in the chamber to decrease which, in turn, causes two things to happen:

1. It opens the check valve and draws more fluid to the pump chamber, and

2. Decreases the momentum of the fluid in tube 70.

As the piston reaches the top of its travel and starts downward, it again closes the check valve and adds momentum to the fluid in tube 70. Since the mass of fluid in the tube remains constant, the variations in momentum as the piston travels up and down are reflected in variations in fluid velocity in the tube. The use of tube 70 thus allows the pump to function effectively without a check valve on the outlet side of the pump. This improves the reliability of the pump and simplifies the cleaning of fluid passages, etc. In addition, the use of a momentum tube, such as tube 70, instead of a positive check valve at the outlet of the pump allows the pump to deliver more flow than the piston displacement. Thus, the piston pump of the present application is not a positive displacement pump but rather it behaves as a variable displacement pump. This happens because the momentum of the outgoing fluid is used to draw fluid into the piston chamber through the check valve at the inlet.

The elastomeric tube 72 thus receives fluid from the rigid tube 70 with a variable velocity. As a result, tube 72 swells in diameter in response to increases in the pressure in the system. The swelling continues until tube 72 is constrained by the coil spring 76 surrounding it. Tube 72 then oscillates with its diameter and length changing so as to damp out the pressure and velocity fluctuations in order to deliver fluid to the nozzle 40 with a relatively constant back pressure. The coil spring also serves to clamp the ends of the tube to prevent the tube from slipping off its connections with tubes 44 and 70. In this regard, the ends of the coil springs are biased radially inwardly so as to urge the ends of the elastomeric tubes to tightly engage tubes 44 and 70.

The changes in length and diameter of the elastomeric tube are reflected as changes in its internal volume. These changes in internal volume are particularly advantageous in the event the discharge equipment becomes blocked downstream from the elastomeric tube. In that event, the piston pumps a volume of fluid through the momentum tube into the elastomeric tube 72 which swells to accept the volume of fluid. The elastomeric tube then shrinks in volume and pushes fluid back down through the momentum tube as the piston rises and the piston chamber increases in volume. Thus, in this mode of operation, (i.e., when the discharge equipment is blocked) the maximum pressure build-up in the system is limited with corresponding reductions in the mechanical loads on the drive components and reductions in electrical loads.

Thus, in accordance with the above, the aforementioned objects and advantages are attained.

Having thus described the invention what is claimed is:

1. An electric sprayer comprising: a tank; a piston pump extending into said tank, said pump comprises a body portion, an elongated cylindrical member extending from said body, a piston rod disposed for movement within said cylinder member, an inlet port defined in said body, a one-way check valve mounted in said inlet port, an outlet port defined in said body; discharge equipment including a spray nozzle connected to said pump outlet; an elongated slender rigid tube extending from said pump outlet for connection with said dis charge equipment; an elongated elastomeric tube interposed between and connected to said rigid tube and said discharge equipment; a coil spring mounted about and coextensive with said elastomeric tube; a housing extending over portions of and connected to said tank; and a motor mounted in said housing, said motor being connected in driving relationship to said pump.

2. The electric sprayer in accordance with claim 1 further comprising a rechargeable battery mounted in said housing, on/off switch means mounted to an exterior surface of said housing, said switch means electrically interconnecting said battery and said motor; and said discharge equipment includes portions pivotally mounted to said housing exterior surface to permit movement between a first inoperative position wherein said discharge means shields said on/off switch to a second operative position wherein said switch is exposed.

3. The electric sprayer is accordance with claim 1 wherein said coil spring includes first and second ends wound about respective first and second ends of said elastomeric tube, said elastomeric tube first end is disposed about one end of said rigid tube, said elastomeric tube second end is disposed about portions of said discharge equipment and said coil spring ends are biased radially inwardly whereby to cooperate in securing said elastomeric tube to said rigid tube and discharge equipment.

Claims (3)

1. An electric sprayer comprising: a tank; a piston pump extending into said tank, said pump comprises a body portion, an elongated cylindrical member extending from said body, a piston rod disposed for movement within said cylinder member, an inlet port defined iN said body, a one-way check valve mounted in said inlet port, an outlet port defined in said body; discharge equipment including a spray nozzle connected to said pump outlet; an elongated slender rigid tube extending from said pump outlet for connection with said discharge equipment; an elongated elastomeric tube interposed between and connected to said rigid tube and said discharge equipment; a coil spring mounted about and coextensive with said elastomeric tube; a housing extending over portions of and connected to said tank; and a motor mounted in said housing, said motor being connected in driving relationship to said pump.
2. The electric sprayer in accordance with claim 1 further comprising a rechargeable battery mounted in said housing, on/off switch means mounted to an exterior surface of said housing, said switch means electrically interconnecting said battery and said motor; and said discharge equipment includes portions pivotally mounted to said housing exterior surface to permit movement between a first inoperative position wherein said discharge means shields said on/off switch to a second operative position wherein said switch is exposed.
3. The electric sprayer is accordance with claim 1 wherein said coil spring includes first and second ends wound about respective first and second ends of said elastomeric tube, said elastomeric tube first end is disposed about one end of said rigid tube, said elastomeric tube second end is disposed about portions of said discharge equipment and said coil spring ends are biased radially inwardly whereby to cooperate in securing said elastomeric tube to said rigid tube and discharge equipment.
US447088A 1974-03-01 1974-03-01 Cordless electric sprayer Expired - Lifetime US3901449A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US447088A US3901449A (en) 1974-03-01 1974-03-01 Cordless electric sprayer

Applications Claiming Priority (23)

Application Number Priority Date Filing Date Title
AR25648274A AR207455A1 (en) 1974-03-01 1974-01-01 electric sprayer
US447088A US3901449A (en) 1974-03-01 1974-03-01 Cordless electric sprayer
IT5273274A IT1019102B (en) 1974-03-01 1974-08-26 Sprayer without electric wire and elements that componpongono
NL7411305A NL7411305A (en) 1974-03-01 1974-08-26 Spraying device.
ZA00745815A ZA7405815B (en) 1974-03-01 1974-09-12 Cordless electric sprayer
IE1919/74A IE39851B1 (en) 1974-03-01 1974-09-16 Cordless electric sprayer
GB40224/74A GB1480382A (en) 1974-03-01 1974-09-16 Cordless electric sprayer
AU73554/74A AU479471B2 (en) 1974-09-20 Cordless electric sprayer
IL45728A IL45728A (en) 1974-03-01 1974-09-24 Cordless electric sprayer
DK515174A DK515174A (en) 1974-03-01 1974-09-30
BE149132A BE820605A (en) 1974-03-01 1974-10-01 Sprayer Electric wireless
PH16364A PH11330A (en) 1974-03-01 1974-10-02 Cordless electric sprayer
FR7433391A FR2262557B1 (en) 1974-03-01 1974-10-03
DE2448893A DE2448893C2 (en) 1974-03-01 1974-10-14
JP12106274A JPS533807B2 (en) 1974-03-01 1974-10-22
SE7414407A SE396534B (en) 1974-03-01 1974-11-15 Electric Vaporizer
BR9686/74A BR7409686A (en) 1974-03-01 1974-11-19 electric sprayer perfected as well as construction of pump, valve and outlet for discharging the same
ES432198A ES432198A1 (en) 1974-03-01 1974-11-22 An electric sprayer.
CH1576674A CH585336A5 (en) 1974-03-01 1974-11-27
CA214,732A CA999832A (en) 1974-03-01 1974-11-27 Cordless electric sprayer
MX175538A MX147344A (en) 1974-03-01 1975-01-17 Improved piston pump for an electric sprayer
AT152375A AT341820B (en) 1974-03-01 1975-02-27 electrical spruhvorrichtung
HK497/79A HK49779A (en) 1974-03-01 1979-07-19 Cordless electric sprayer

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US3901449A true US3901449A (en) 1975-08-26

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US447088A Expired - Lifetime US3901449A (en) 1974-03-01 1974-03-01 Cordless electric sprayer

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US (1) US3901449A (en)
JP (1) JPS533807B2 (en)
BE (1) BE820605A (en)
CA (1) CA999832A (en)
DK (1) DK515174A (en)
ES (1) ES432198A1 (en)
IL (1) IL45728A (en)
NL (1) NL7411305A (en)
PH (1) PH11330A (en)
SE (1) SE396534B (en)
ZA (1) ZA7405815B (en)

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Also Published As

Publication number Publication date
SE7414407A (en) 1975-09-02
PH11330A (en) 1977-11-02
IL45728A (en) 1977-04-29
SE396534B (en) 1977-09-26
BE820605A1 (en)
ZA7405815B (en) 1975-09-24
JPS50120007A (en) 1975-09-19
ES432198A1 (en) 1976-09-01
JPS533807B2 (en) 1978-02-10
IL45728D0 (en) 1974-11-29
DK515174A (en) 1975-11-03
NL7411305A (en) 1975-09-03
CA999832A (en) 1976-11-16
CA999832A1 (en)
BE820605A (en) 1975-02-03

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