CA1169827A - Back pack pump and spray apparatus - Google Patents
Back pack pump and spray apparatusInfo
- Publication number
- CA1169827A CA1169827A CA000398852A CA398852A CA1169827A CA 1169827 A CA1169827 A CA 1169827A CA 000398852 A CA000398852 A CA 000398852A CA 398852 A CA398852 A CA 398852A CA 1169827 A CA1169827 A CA 1169827A
- Authority
- CA
- Canada
- Prior art keywords
- tube
- sidewalls
- chamber
- nut
- improvement
- 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
Links
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
- B05B9/0403—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 with pumps for liquids or other fluent material
- B05B9/0426—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 with pumps for liquids or other fluent material with a pump attached to the spray gun or discharge device
Landscapes
- Details Of Reciprocating Pumps (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An ambulant liquid spray apparatus includes a portable liquid storage tank having shoulder carrying straps, a single-action pump for spraying the contents of the tank and a flexible hose communicating one end of the pump with the stored liquid. The pump body defines a cylindrical chamber in which is slidably disposed a rigid tube having a free end with a non-telescoping handle extending outwardly of the chamber for reciprocably displacing the tube within the chamber and a pair of check valves located within the tube and pump body direct a unidirectional flow of liquid through the chamber and tube as the tube is reciprocably displaced. A packing gland nut sealably closes the other end of the chamber intermediate the body and tube, the nut having sidewalls defining an aperture aligned coaxially with the chamber for slidably guiding the tube, seal means inter-mediate the sidewalls and tube, and an annular chamber formed in the sidewalls and defining a lubricant reservoir intermediate the sidewalls, seal means and tube so that a liquid lubricant confined to the reservoir lubricates effectively the portion of the tube slidably guided by the nut.
An ambulant liquid spray apparatus includes a portable liquid storage tank having shoulder carrying straps, a single-action pump for spraying the contents of the tank and a flexible hose communicating one end of the pump with the stored liquid. The pump body defines a cylindrical chamber in which is slidably disposed a rigid tube having a free end with a non-telescoping handle extending outwardly of the chamber for reciprocably displacing the tube within the chamber and a pair of check valves located within the tube and pump body direct a unidirectional flow of liquid through the chamber and tube as the tube is reciprocably displaced. A packing gland nut sealably closes the other end of the chamber intermediate the body and tube, the nut having sidewalls defining an aperture aligned coaxially with the chamber for slidably guiding the tube, seal means inter-mediate the sidewalls and tube, and an annular chamber formed in the sidewalls and defining a lubricant reservoir intermediate the sidewalls, seal means and tube so that a liquid lubricant confined to the reservoir lubricates effectively the portion of the tube slidably guided by the nut.
Description
8~
ACKGROUND OE Ti~E INVENTION
The presen-t invention relates to liquid spray appara-tus and more partieuiarly to a back paek form oE such apparatus and to an improved single-aetion spray pump used therewi-th.
An ambulant liquid spraying pump and supply tank, -cor~nonly referred to as a b~ck paek pu~lp, usu~lly eomprises a separate, liquid storage tank that is shaped so as to be eomfortably carried on the baek and shoulders of an :Lndi-vidual. In this regard, shoulder s-traps are prov:ided by means of ~hich the tank may be earried in the manner oE a conventional back paek.
A single-action pump eommunieating with the interior of the tank by means of a flexible hose provides the means neeessary for pumping and ejeeting either a solid stream of liquid or a spray depending upon the form of nozzle employed.
[n its usual conforrnation, the pump eornprises a body haviny a cylindrieal pump ehamber in which there is reeiprocahly dis-posed a pistonand eonneeting rod in the Eorm Oe a rlgid -tube.
A cheek valve assembly disposed within eornmon ends of the cylinder and tube is responsive to fluid pressures generated during reeiprocation of the tube, resulting in a pressure buildup and eoneomittant movement of the water unidirectionally throu~h the ehamber and tube forejection at the nozzle.
Applieations in whi~h such ~umps are employed in-clude domestic use as garden sprayers that are generally sub--jected to harsh operating eonditions as a result o-f corrosive and toxie pes-tieides and herbieides. A eommon prohlem ex-perienced wi-th known back pac~ pumps are leaks -that frequen-tly develop a-t the packiny gland oE the pump as a rèsul-t of wear .`', ~
from insufficien-t lubrication and physical disE~lacemen-t of packing gland sealing material which may comprise compressed fibers impregnated with graphi-te and one or more petroleum based lubrican-ts.
A more important use for back pack pumps is in fiyhting forest Eires or brush fires. Under these circum-stances operatiTIcJ condi-tions are normally severe and may even be worsened by using locally available cold sur-face water as a fire extinc~llishant. Continued loncJ and hard use coupled with low temperatures :induced by the cold water generally leads to lnefEicien-t opera-tion oE the pump as a result of increased sliding Eric-tion resulting from redueed effective-ness of petroleum luhricants, partieularly of the solici form.
Ineffec-tive luhrica-tion also results in early failure of paeking glands causing lea]~age at the paeking gland nut and overall reduced efficiency of the pump. Under the harrowing conditions of fire fighting, i-t is understandable how lubrl-cation requiremen-ts would be ignored thereby causing genera:Lly poor operating performance of pumps and inevitably, early Eailure.
Pumps having telescoping-type handles are Ereq~lent:Ly employed and ]ead to the problem of finger pinching which can be so severe as to incapacitate a fire fighter. This problem occurs when, through inat-tention, or distraction, an operator allows a finger or some portion of his hand on the pump handle to slide between -the handle and pump body. Since the tele-scoping handle overlaps the body of the pump to some degree, the finger or o-ther portion of the operator's hand will be pinched on a compression stroke.
~ `
:,.................................. .
~9~ 7 SUMMARY OF 'l'ilE INVENT:[ON
: A most significant provision of the presen-t in-vention is an improved single-action pump havincJ a packing gland nut that includes a luhricant reservoir.
Ano-ther provision of the invention is a packing gland nu-t in which the reservoir is adapted to retain liquid lubricants for e:~fectively lubricating the pump irrespec-tive of o~eratLIly lelnl~eratures.
Still another provision of the invention isa packing glarld nut having a longer service life and a reduced -tendency to leak.
Still another provision of the invention is a single-ac-tion pump having a non-telescoping type of handle -to avoid finger pinching.
Ye-t another provision of the invention is a back pack pump that is simple in cons-truction and correspondingly simple to fabricate.
The problems associated with back pack pumps of -the prior art may be substantially overcome and the ~oregoing provisions achieved by recourse to my invention which com-prises an improvement in a liquid sp:ray appara-tus haviny a pump body defininy a cylindri.cal chamber open at bo-th ends, means closing one end and communicating the chamber with a source of liquid, a rigid tube slidably disposed within -the chamber with a free end extendi~y outwardly therefrom for . reciprocably displacing the.tube within the chamber, and : valve means disposed within the closure means and -tube for directing a unidirectional flow of liquid through the chamber and tube when the tube is reciprocably displaced. The improve-- 30 men-t comprises a pac}~ing gland nut sealably ¢losing the open z7 end of the chamber intermediate -the bGdy and tube, the nu-t having sidewalls defining an aper-ture aligned coaxially wi-th the chamber for slidably guiding the tube, seals means inter mediate the sidewalls and tube, and an annular chamber fo~ned in the sidewalls and defining a lubricant reservoir in-termediate the sidewalls, seal means and tube ~hereby a lubricant confined to the reservoir lubricates the portion of the tube slidably guided by the nut.
DESCRIPTION OF TEIE DRAWINGS
l`he invention will now be more par-ticularly described with reference to an embodiment thereof shown, by way of example, in the accompan~7ing drawings in which:
Fig. 1 is a perspective view of a back pack pump embodying the features of the present invention;
Fig. 2 is a plan view of a single-action pump in accordance with the present invention wi-th portions broken away to show the internal structure thereof;
Fig. 3 is a longitudinal sectional view -taken along the lines 3-3 of -the pump in Fig. 2;
Fig. 4 is a longitudinal sectional view -taken along the lines 4-4 of the pump in Fig. 2;
ig. 5 is a cross-sectional view taken along -the lines 5-5 in Fig. 4; and `~ Fig. 6 is an end view of an in-ternal member of the pump in Fig. 2. ~
~` .
DESCRIPTION OF THE I~LUSTP~TED EM~ODIMENTS
A back pack pump 10 is illustrated in Fig. 1 and embodies the best mode contemplated by the inven-tor for carrying out the invention hereinbelow described. It will _ 4 . ~
~69BZ7 be observed -that -the pump 10 comp~ises a source o~ uid in the form of a conventionally-shaped i.e., a cross-sectlon having a kidney shape, tank 11 that is particularly adapted to be carried upon the back and $houlders of an individual by an arrangement of shoulder s-traps 12 -that are swivelably ' connected in a known manner -to the tank 11 by means of - connectors 13 as sllown. Ili~uid to be stored in the tank 11 enters by way of an inlet 14 -that is defined by a short, upstanding cylindrical sidewall 15 carryin~ threads on the outer surface thereof which are engageable by corresponding threads in a known form of closure cap 16 having a central vent aper-ture 17.
~ single-action pump 20 is shown carried across the uppermos-t end of the pump 10 by means of a combined pump holder and carrying handle 21, fastened to the uppermost end of ~he pump 10 by means of machine screws 22 set in the side-walls of the tank 11. Resilient spring fingers 23 are curved -to grip the pump 20 and to hold it firmly against -the handle 21. This combination provides a comfortable carryiny handle wi-th increased streng-th to resist bending when carryiny a fully laden tank 11.
The pump 20 communicates ~ith the contents of the -tank 11 by way of a resilient hose 24, one end of the hose being clamped -to a bottom spigot 25 by means of a spring clip 26 and the other end of,the hose being similarly con-, nected to one end of the pu~p 20.
~ hollow eyelet 27 fits within the aper-ture 17 and is fastened to one end of a chain 2,8 to prevent loss of the cap. The free end of -the chain is shown anchored to the handle 21.
A larger, more detailed view of the pump 20 appears in Fig. 2 with portions broken away to show the interior s-tructure thereof including a pump body 30 which '- defines a cylindrical pump chamber 31 that is open ~t hoth ends thereof. In its assembled Eorm, however, both open ends are closed. As shown in Figs. 2 and 3, one end is closed by a packing gland nut 32 that is threadably connected to the body 30. The other end is closed by means of a check valve assembly 33 having a spigot 34 -to which is clamped the hose 24.
Slidably disposed within the chamber 31 is a piston and rod assembly shown as a rigid tube 35 ~hich, it will be : understood, is coaxially disposed wi-th the long axis of the chamber 31. A free end extending outwardly from the chamber has mounted thereon a non-telescoping handle 36 by means of which the tube 35 may be reciprocably displaced within the chamber .
Although not shown in detail, it will be understood that the handle 36 is held in fixed relation to the free end of the tube 35 by means of a washer 37 that is affixed to the .
-tube 35, such as by brazing, and a hexagonal nut 38 that ls threadably connected to correspondiny threads 39. A threaded portion 40 outstanding from the nut 38 is adapted to engage corresponding threads of a spray nozzle 41 that is held cap-tive to the handle assembly ,by means of a sliding ring 42 connected by a chain 43 to an'anchoring washer 44posi-tioned in-termediate the nut 38 and the handle 36. A resilient washer 45 is positioned intermediate the nozzle 41 and -the nut 38 and acts as a seal to prevent leak$ therebe-tween.
r 30 Pinching of fingers is substantially elimina-ted ~L~6~
since -there is no overlap he-tween -the handle 36 and the nu-t 32~ Moreover, by virtue of the curved surfaces inter-facing the handle and nut, -there is a -tendency to push a finger out of -the way rather than pinching therebetween.
Tllis particular feature of the embodiment illus-tra-ted is further enhanced by an O-ring ~6 that is positioned coaxially with -the tube 35 and intermediate -the nu-t 32 and washer 37.
The main func-tion of the o ring ~6, however, is to ac-t as a resilient bufEer between the nut and washer to reduce noise and increase service life by absorbing -the impac-t between the nu-t and washer during pumping opera-tions.
The innermost end of the tube 35 i5 clearly illustratecl in a sectional view in Fig. 4 which shows the end to be threaded and connected thereby with corresponding threads 47 lnside a he~agonal nut shown as a hollow p'iston 50. Referenceto ~iCJS. ~ and 6 reveals tha-t the pis-ton 50 has a closed end that includes a central aperture 51. It will be understood -that the outside diameter oE -the pis-ton 50 is greater than thak of the tube 35 and lesser than that of the chamber 31 so as to provide subs-tantially linear reciprocation of the -tube along ' -the long axis of the chamber.
Loca-ted within the piston 50 is a firs-t checlc valve 52 that comprises a ball valve 53 held ~ieldably against a i chamfered inner edge 54 of the aperture 51 by means of a '~ helical re-taining spring 55 that'is positionedbetween the ball valve and a support member~56. The'member 56 traverses - the sidewalls of the tube 35 adjacent -the free end there-'~ of and is fi~ed in posi-tion by means of brazing, soldering and - the like. An O-ring 57 is shown mounted concen-trically with -the tube 35 and functions as a shoc]c absorber in a manner ~l69827 simllar to the O-ring 46.
A longitudinal sectional view of ~,he nut 32 is illustrated in Fig. 3 and shows sidewalls 58 that defi.ne an aperture which :is aligned coaxia~ly with the chambex 31 and through which the tube 35 extends. Seal means are provided in the form of a pair of resilient O-rings 60 and 61, the O-ring 60 being substantially larger in cross-sectional diameter than the O-ring 61 so as to provide sufficient lateral support. This ensures that the exterior surface of the tube 35 .1(1 engages in slidable contact only the O-rings 60 and 61 and does not stri.ke the sidewalls 58. Contact therebetween cou:ld scratch the tube 35 which could lead to an imper~ect seal and earl~
failure of the O-rings 60 and 61.
. It will be observed that the O-rings 60 and 61 are ~ held captive withi.n respective annular cha.mbers 62 and 63 that ~ prevent accidental displac~mentof the O-ri.ngs as a result of -Erictional contact with the tube 35. It will be understood ; from Fig. 3 that the nut 32 is longitudinally displaceable along the threaded portion of the body 30 such that when tightened ~ 20 thereon the O--ring 60 is restorably compressed in axial re-.~ lation with the open end of the body 30. As a consequence of such compression, the O-ring 60 is restorably expansible in a rad-ial direction intermed.iate the sidewalls 58 and the tube 35 .: to ef:Eect an adjus-table seal therebetween as the nut 32 is either tightened or loosened. Of particular significance is a third annular chamber 64 formed in the sidewalls 58 of the ` nut 32 intermediate the O-rings 60 and 61. The chamber 64 defines a lubricant reservoir that is well adapted to confine liquid lubricants in order to adequately lubricate the portion of the tube 35 that is slidably guided by the nut 32. A
'~' ~698Z7 s~itable lu~rican-t is admitted to the chamber 64 by means o,f a lubrication fitting 65 that is flush mounted with the ~xterna~. surface of the nut and which communicates the reservoir, defined by the chamber 64 and the O-rings 60 and 61 i.n slidable relation with the tube 35~ with an externa~
source of lubricant (not shown).
The other end of the body 30 is c:Losed by the check valve assembly 33 as may.be best seen in a longitudinal sectional view thereof in Fig. 4 and a cross-sectional view in Fig. 5. The physical confo.rmation of the assembly 33 :is ~ha-t of a screw cap having first sidewalls threadably con-nected to corresponding threads on one end of the body 30 and second sidewalls defining a stepped cylindri.cal aperture 70 wlth a cha~fered stepped portion 72. A ball valve 71 is freely disposed in the portion of the aperture having the greater diameter and is adapted to openabl.y close the aperture upon contact with the chamfered stepped portion 72. A resilient, apertured disk 73 is positiorled between the free ends of the body 30 and the assembly 33, its function being to hold the ball valve 71 captive and, by flexing into the chamber 31, to provide a less constricted passageway for fluid flow from the tank ll into the pump 20. In this regard, it will be seen that on the compression stroke of the tube 35 the ball valve 71 is seated against the chamfered edge 72, thus sealiny the aperture 70. Concurrently, the ball valve 53 unseat6 and admits liquid from bhe chamber 31 into the interior of the tube 35, the pressurized contents thereby being ~orcibly e~ected through the spray nozzle 41. Conversely, on the draw stroke, a suction pressure is created ~y the withdrawn tube 35 such that the disk 73 flexes slightly into the chamber 31.
_ g _ ~L6i9~327 Concllrrently, the ball :icllve 71 abuts a centra~ portior o r-the disk 73 and incoming liquid flows around the ball va.'.-e 71 and out through apertures 74 to at Least partially .fi.L
the chamber 31. On the compression stroke, tne liquid is ejected thro~ugh the nozzle 41 and the pumplng cycle is repeatecl.
It will be apparen-t to those skilled in the art that the preceding description of an embodimen-t oE t.he in-venti.on may be varied to meet particular speciali.zed. require--I ments without departing from the true spirit and scope of the invention disclosed. The embodiment described is there-fore not to be taken as indicative of the limits of the in-vention but rather as an exemplary structure thereo.f whi.ch is defined by the claims appended here;to.
... . . . ..
~ .
ACKGROUND OE Ti~E INVENTION
The presen-t invention relates to liquid spray appara-tus and more partieuiarly to a back paek form oE such apparatus and to an improved single-aetion spray pump used therewi-th.
An ambulant liquid spraying pump and supply tank, -cor~nonly referred to as a b~ck paek pu~lp, usu~lly eomprises a separate, liquid storage tank that is shaped so as to be eomfortably carried on the baek and shoulders of an :Lndi-vidual. In this regard, shoulder s-traps are prov:ided by means of ~hich the tank may be earried in the manner oE a conventional back paek.
A single-action pump eommunieating with the interior of the tank by means of a flexible hose provides the means neeessary for pumping and ejeeting either a solid stream of liquid or a spray depending upon the form of nozzle employed.
[n its usual conforrnation, the pump eornprises a body haviny a cylindrieal pump ehamber in which there is reeiprocahly dis-posed a pistonand eonneeting rod in the Eorm Oe a rlgid -tube.
A cheek valve assembly disposed within eornmon ends of the cylinder and tube is responsive to fluid pressures generated during reeiprocation of the tube, resulting in a pressure buildup and eoneomittant movement of the water unidirectionally throu~h the ehamber and tube forejection at the nozzle.
Applieations in whi~h such ~umps are employed in-clude domestic use as garden sprayers that are generally sub--jected to harsh operating eonditions as a result o-f corrosive and toxie pes-tieides and herbieides. A eommon prohlem ex-perienced wi-th known back pac~ pumps are leaks -that frequen-tly develop a-t the packiny gland oE the pump as a rèsul-t of wear .`', ~
from insufficien-t lubrication and physical disE~lacemen-t of packing gland sealing material which may comprise compressed fibers impregnated with graphi-te and one or more petroleum based lubrican-ts.
A more important use for back pack pumps is in fiyhting forest Eires or brush fires. Under these circum-stances operatiTIcJ condi-tions are normally severe and may even be worsened by using locally available cold sur-face water as a fire extinc~llishant. Continued loncJ and hard use coupled with low temperatures :induced by the cold water generally leads to lnefEicien-t opera-tion oE the pump as a result of increased sliding Eric-tion resulting from redueed effective-ness of petroleum luhricants, partieularly of the solici form.
Ineffec-tive luhrica-tion also results in early failure of paeking glands causing lea]~age at the paeking gland nut and overall reduced efficiency of the pump. Under the harrowing conditions of fire fighting, i-t is understandable how lubrl-cation requiremen-ts would be ignored thereby causing genera:Lly poor operating performance of pumps and inevitably, early Eailure.
Pumps having telescoping-type handles are Ereq~lent:Ly employed and ]ead to the problem of finger pinching which can be so severe as to incapacitate a fire fighter. This problem occurs when, through inat-tention, or distraction, an operator allows a finger or some portion of his hand on the pump handle to slide between -the handle and pump body. Since the tele-scoping handle overlaps the body of the pump to some degree, the finger or o-ther portion of the operator's hand will be pinched on a compression stroke.
~ `
:,.................................. .
~9~ 7 SUMMARY OF 'l'ilE INVENT:[ON
: A most significant provision of the presen-t in-vention is an improved single-action pump havincJ a packing gland nut that includes a luhricant reservoir.
Ano-ther provision of the invention is a packing gland nu-t in which the reservoir is adapted to retain liquid lubricants for e:~fectively lubricating the pump irrespec-tive of o~eratLIly lelnl~eratures.
Still another provision of the invention isa packing glarld nut having a longer service life and a reduced -tendency to leak.
Still another provision of the invention is a single-ac-tion pump having a non-telescoping type of handle -to avoid finger pinching.
Ye-t another provision of the invention is a back pack pump that is simple in cons-truction and correspondingly simple to fabricate.
The problems associated with back pack pumps of -the prior art may be substantially overcome and the ~oregoing provisions achieved by recourse to my invention which com-prises an improvement in a liquid sp:ray appara-tus haviny a pump body defininy a cylindri.cal chamber open at bo-th ends, means closing one end and communicating the chamber with a source of liquid, a rigid tube slidably disposed within -the chamber with a free end extendi~y outwardly therefrom for . reciprocably displacing the.tube within the chamber, and : valve means disposed within the closure means and -tube for directing a unidirectional flow of liquid through the chamber and tube when the tube is reciprocably displaced. The improve-- 30 men-t comprises a pac}~ing gland nut sealably ¢losing the open z7 end of the chamber intermediate -the bGdy and tube, the nu-t having sidewalls defining an aper-ture aligned coaxially wi-th the chamber for slidably guiding the tube, seals means inter mediate the sidewalls and tube, and an annular chamber fo~ned in the sidewalls and defining a lubricant reservoir in-termediate the sidewalls, seal means and tube ~hereby a lubricant confined to the reservoir lubricates the portion of the tube slidably guided by the nut.
DESCRIPTION OF TEIE DRAWINGS
l`he invention will now be more par-ticularly described with reference to an embodiment thereof shown, by way of example, in the accompan~7ing drawings in which:
Fig. 1 is a perspective view of a back pack pump embodying the features of the present invention;
Fig. 2 is a plan view of a single-action pump in accordance with the present invention wi-th portions broken away to show the internal structure thereof;
Fig. 3 is a longitudinal sectional view -taken along the lines 3-3 of -the pump in Fig. 2;
Fig. 4 is a longitudinal sectional view -taken along the lines 4-4 of the pump in Fig. 2;
ig. 5 is a cross-sectional view taken along -the lines 5-5 in Fig. 4; and `~ Fig. 6 is an end view of an in-ternal member of the pump in Fig. 2. ~
~` .
DESCRIPTION OF THE I~LUSTP~TED EM~ODIMENTS
A back pack pump 10 is illustrated in Fig. 1 and embodies the best mode contemplated by the inven-tor for carrying out the invention hereinbelow described. It will _ 4 . ~
~69BZ7 be observed -that -the pump 10 comp~ises a source o~ uid in the form of a conventionally-shaped i.e., a cross-sectlon having a kidney shape, tank 11 that is particularly adapted to be carried upon the back and $houlders of an individual by an arrangement of shoulder s-traps 12 -that are swivelably ' connected in a known manner -to the tank 11 by means of - connectors 13 as sllown. Ili~uid to be stored in the tank 11 enters by way of an inlet 14 -that is defined by a short, upstanding cylindrical sidewall 15 carryin~ threads on the outer surface thereof which are engageable by corresponding threads in a known form of closure cap 16 having a central vent aper-ture 17.
~ single-action pump 20 is shown carried across the uppermos-t end of the pump 10 by means of a combined pump holder and carrying handle 21, fastened to the uppermost end of ~he pump 10 by means of machine screws 22 set in the side-walls of the tank 11. Resilient spring fingers 23 are curved -to grip the pump 20 and to hold it firmly against -the handle 21. This combination provides a comfortable carryiny handle wi-th increased streng-th to resist bending when carryiny a fully laden tank 11.
The pump 20 communicates ~ith the contents of the -tank 11 by way of a resilient hose 24, one end of the hose being clamped -to a bottom spigot 25 by means of a spring clip 26 and the other end of,the hose being similarly con-, nected to one end of the pu~p 20.
~ hollow eyelet 27 fits within the aper-ture 17 and is fastened to one end of a chain 2,8 to prevent loss of the cap. The free end of -the chain is shown anchored to the handle 21.
A larger, more detailed view of the pump 20 appears in Fig. 2 with portions broken away to show the interior s-tructure thereof including a pump body 30 which '- defines a cylindrical pump chamber 31 that is open ~t hoth ends thereof. In its assembled Eorm, however, both open ends are closed. As shown in Figs. 2 and 3, one end is closed by a packing gland nut 32 that is threadably connected to the body 30. The other end is closed by means of a check valve assembly 33 having a spigot 34 -to which is clamped the hose 24.
Slidably disposed within the chamber 31 is a piston and rod assembly shown as a rigid tube 35 ~hich, it will be : understood, is coaxially disposed wi-th the long axis of the chamber 31. A free end extending outwardly from the chamber has mounted thereon a non-telescoping handle 36 by means of which the tube 35 may be reciprocably displaced within the chamber .
Although not shown in detail, it will be understood that the handle 36 is held in fixed relation to the free end of the tube 35 by means of a washer 37 that is affixed to the .
-tube 35, such as by brazing, and a hexagonal nut 38 that ls threadably connected to correspondiny threads 39. A threaded portion 40 outstanding from the nut 38 is adapted to engage corresponding threads of a spray nozzle 41 that is held cap-tive to the handle assembly ,by means of a sliding ring 42 connected by a chain 43 to an'anchoring washer 44posi-tioned in-termediate the nut 38 and the handle 36. A resilient washer 45 is positioned intermediate the nozzle 41 and -the nut 38 and acts as a seal to prevent leak$ therebe-tween.
r 30 Pinching of fingers is substantially elimina-ted ~L~6~
since -there is no overlap he-tween -the handle 36 and the nu-t 32~ Moreover, by virtue of the curved surfaces inter-facing the handle and nut, -there is a -tendency to push a finger out of -the way rather than pinching therebetween.
Tllis particular feature of the embodiment illus-tra-ted is further enhanced by an O-ring ~6 that is positioned coaxially with -the tube 35 and intermediate -the nu-t 32 and washer 37.
The main func-tion of the o ring ~6, however, is to ac-t as a resilient bufEer between the nut and washer to reduce noise and increase service life by absorbing -the impac-t between the nu-t and washer during pumping opera-tions.
The innermost end of the tube 35 i5 clearly illustratecl in a sectional view in Fig. 4 which shows the end to be threaded and connected thereby with corresponding threads 47 lnside a he~agonal nut shown as a hollow p'iston 50. Referenceto ~iCJS. ~ and 6 reveals tha-t the pis-ton 50 has a closed end that includes a central aperture 51. It will be understood -that the outside diameter oE -the pis-ton 50 is greater than thak of the tube 35 and lesser than that of the chamber 31 so as to provide subs-tantially linear reciprocation of the -tube along ' -the long axis of the chamber.
Loca-ted within the piston 50 is a firs-t checlc valve 52 that comprises a ball valve 53 held ~ieldably against a i chamfered inner edge 54 of the aperture 51 by means of a '~ helical re-taining spring 55 that'is positionedbetween the ball valve and a support member~56. The'member 56 traverses - the sidewalls of the tube 35 adjacent -the free end there-'~ of and is fi~ed in posi-tion by means of brazing, soldering and - the like. An O-ring 57 is shown mounted concen-trically with -the tube 35 and functions as a shoc]c absorber in a manner ~l69827 simllar to the O-ring 46.
A longitudinal sectional view of ~,he nut 32 is illustrated in Fig. 3 and shows sidewalls 58 that defi.ne an aperture which :is aligned coaxia~ly with the chambex 31 and through which the tube 35 extends. Seal means are provided in the form of a pair of resilient O-rings 60 and 61, the O-ring 60 being substantially larger in cross-sectional diameter than the O-ring 61 so as to provide sufficient lateral support. This ensures that the exterior surface of the tube 35 .1(1 engages in slidable contact only the O-rings 60 and 61 and does not stri.ke the sidewalls 58. Contact therebetween cou:ld scratch the tube 35 which could lead to an imper~ect seal and earl~
failure of the O-rings 60 and 61.
. It will be observed that the O-rings 60 and 61 are ~ held captive withi.n respective annular cha.mbers 62 and 63 that ~ prevent accidental displac~mentof the O-ri.ngs as a result of -Erictional contact with the tube 35. It will be understood ; from Fig. 3 that the nut 32 is longitudinally displaceable along the threaded portion of the body 30 such that when tightened ~ 20 thereon the O--ring 60 is restorably compressed in axial re-.~ lation with the open end of the body 30. As a consequence of such compression, the O-ring 60 is restorably expansible in a rad-ial direction intermed.iate the sidewalls 58 and the tube 35 .: to ef:Eect an adjus-table seal therebetween as the nut 32 is either tightened or loosened. Of particular significance is a third annular chamber 64 formed in the sidewalls 58 of the ` nut 32 intermediate the O-rings 60 and 61. The chamber 64 defines a lubricant reservoir that is well adapted to confine liquid lubricants in order to adequately lubricate the portion of the tube 35 that is slidably guided by the nut 32. A
'~' ~698Z7 s~itable lu~rican-t is admitted to the chamber 64 by means o,f a lubrication fitting 65 that is flush mounted with the ~xterna~. surface of the nut and which communicates the reservoir, defined by the chamber 64 and the O-rings 60 and 61 i.n slidable relation with the tube 35~ with an externa~
source of lubricant (not shown).
The other end of the body 30 is c:Losed by the check valve assembly 33 as may.be best seen in a longitudinal sectional view thereof in Fig. 4 and a cross-sectional view in Fig. 5. The physical confo.rmation of the assembly 33 :is ~ha-t of a screw cap having first sidewalls threadably con-nected to corresponding threads on one end of the body 30 and second sidewalls defining a stepped cylindri.cal aperture 70 wlth a cha~fered stepped portion 72. A ball valve 71 is freely disposed in the portion of the aperture having the greater diameter and is adapted to openabl.y close the aperture upon contact with the chamfered stepped portion 72. A resilient, apertured disk 73 is positiorled between the free ends of the body 30 and the assembly 33, its function being to hold the ball valve 71 captive and, by flexing into the chamber 31, to provide a less constricted passageway for fluid flow from the tank ll into the pump 20. In this regard, it will be seen that on the compression stroke of the tube 35 the ball valve 71 is seated against the chamfered edge 72, thus sealiny the aperture 70. Concurrently, the ball valve 53 unseat6 and admits liquid from bhe chamber 31 into the interior of the tube 35, the pressurized contents thereby being ~orcibly e~ected through the spray nozzle 41. Conversely, on the draw stroke, a suction pressure is created ~y the withdrawn tube 35 such that the disk 73 flexes slightly into the chamber 31.
_ g _ ~L6i9~327 Concllrrently, the ball :icllve 71 abuts a centra~ portior o r-the disk 73 and incoming liquid flows around the ball va.'.-e 71 and out through apertures 74 to at Least partially .fi.L
the chamber 31. On the compression stroke, tne liquid is ejected thro~ugh the nozzle 41 and the pumplng cycle is repeatecl.
It will be apparen-t to those skilled in the art that the preceding description of an embodimen-t oE t.he in-venti.on may be varied to meet particular speciali.zed. require--I ments without departing from the true spirit and scope of the invention disclosed. The embodiment described is there-fore not to be taken as indicative of the limits of the in-vention but rather as an exemplary structure thereo.f whi.ch is defined by the claims appended here;to.
... . . . ..
~ .
Claims (46)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. In a liquid spray apparatus having a pump body de-fining a cylindrical chamber open at both ends, means closing one end and communicating the chamber with a source of liquid, a rigid tube slidably disposed within the chamber with a free end extending outwardly therefrom for reciprocably displacing the tube within the chamber, and valve means disposed within the closure means and tube for directing a unidirectional flow of liquid through the chamber and tube when the tube is recip-rocably displaced, the improvement comprising a packing gland nut sealably closing the open end of the chamber intermediate the body and tube, the nut having sidewalls defining an aperture aligned coaxially with the chamber for slidably guiding the tube, seal means intermediate the sidewalls and tube, and an annular chamber formed in the sidewalls and defining a lubri-cant reservoir intermediate the sidewalls, seal means and tube whereby a lubricant confined to the reservoir lubricates the portion of the tube slidably guided by the nut.
2. An improvement as claimed in Claim 1 wherein the seal means comprise a pair of longitudinally spaced, resilient seals.
3. An improvement as claimed in Claim 2, further comprising a second annular chamber formed in the sidewalls adjacent the innermost end of the nut for retaining one of the seals.
4. An improvement as claimed in Claim 3, further comprising a third annular chamber formed in the sidewalls adjacent the free end of the nut for retaining the second one of the seals.
5. An improvement as claimed in Claim 4 wherein the pair of resilient seals comprise O-rings.
6. An improvement as claimed in Claim 5 wherein the O-ring occupying the second annular chamber has a cross-sectional diameter at least twice that of the other O-ring.
7. An improvement as claimed in Claim 6, further comprising a non-telescoping handle mounted on the free end of the tube in coaxial alignment therewith and in slightly spaced relation with the free end of the nut.
8. An improvement as claimed in Claim 7, further comprising first check valve means mounted on the innermost end of the tube and concentrically therewith, the check valve means having an outside diameter greater than that of the tube and lesser than that of the pump chamber to provide substantially linear reciprocation of the tube along the axis of the chamber.
9. An improvement as claimed in Claim 8 wherein the check valve means comprises a hexagonal nut having sidewalls threadably connected to corresponding threads on the tube, an end wall closing the tube, an aperture with a chamfered inner edge formed centrally in the end wall, a support member disposed diametrically across the tube adjacent the free end thereof, a ball adapted to closably engage the chamfered inner edge and a resilient member intermediate the support member and ball, urging the ball against the chamfered inner edge and maintaining the check valve means normally closed and openable upon application to the ball of pressure exceeding the pressure exerted by the resilient member.
10. An improvement as claimed in Claim 9, further comprising second check valve means having first sidewalls threadably connected to corresponding threads on one end of the body, second sidewalls defining a stepped cylindrical aperture through the second check valve means, the stepped portion being chamfered, a ball freely disposed in the portion of the aperture having the greater diameter and adapted to openably close the aperture upon contact between the chamfered stepped portion and ball, and a resilient, apertured disk overlying the ball and maintaining the ball captive within the aperture.
11. An improvement as claimed in Claim 10, further comprising a second aperture formed in the sidewalls for communicating the reservoir with an external source of lubricant.
12. An improvement as claimed in Claim 11, further comprising an openable, normally closed lubrication fitting fixedly positioned in the second aperture.
13. An improvement as claimed in Claim 12 wherein the lubrication fitting is flush mounted with the external surface of the nut.
14. An improvement as claimed in Claim 13, further comprising an O-ring disposed concentrically with the tube intermediate the handle and packing gland nut.
15. An improvement as claimed in Claim 14, further comprising an O-ring disposed concentrically with the tube intermediate the packing gland nut and hexagonal nut.
16. A liquid spray apparatus, comprising:
tank means for storing a sprayable liquid;
a pump body defining a cylindrical chamber open at both ends, including means closing one end and communicating the chamber with the stored liquid;
a rigid tube slidably disposed within the chamber with a free end extending outwardly therefrom for reciprocably displacing the tube within the chamber;
valve means disposed within the closure means and tube for directing a unidirectional flow of liquid through the chamber and tube when the tube is reciprocably displaced;
and a packing gland nut sealably closing the open end of the chamber intermediate the body and tube, the nut having sidewalls defining an aperture aligned coaxially with the chamber for slidably guiding the tube, seal means intermediate the sidewalls and tube, and an annular chamber formed in the sidewalls and defining a lubricant reservoir intermediate the sidewalls, seal means and tube whereby a lubricant con-fined to the reservoir lubricates the portion of the -tube slidably guided by the nut.
tank means for storing a sprayable liquid;
a pump body defining a cylindrical chamber open at both ends, including means closing one end and communicating the chamber with the stored liquid;
a rigid tube slidably disposed within the chamber with a free end extending outwardly therefrom for reciprocably displacing the tube within the chamber;
valve means disposed within the closure means and tube for directing a unidirectional flow of liquid through the chamber and tube when the tube is reciprocably displaced;
and a packing gland nut sealably closing the open end of the chamber intermediate the body and tube, the nut having sidewalls defining an aperture aligned coaxially with the chamber for slidably guiding the tube, seal means intermediate the sidewalls and tube, and an annular chamber formed in the sidewalls and defining a lubricant reservoir intermediate the sidewalls, seal means and tube whereby a lubricant con-fined to the reservoir lubricates the portion of the -tube slidably guided by the nut.
17. Apparatus as claimed in Claim 16 wherein the seal means comprise a pair of longitudinally spaced resilient seals.
18. Apparatus as claimed in Claim 17, further com-prising a second annular chamber formed in the sidewalls adjacent the innermost end of the nut for retaining one of the seals.
19. Apparatus as claimed in Claim 18, further com-prising a third annular chamber formed in the sidewalls adjacent the free end of the nut for retaining the second one of the seals.
20. Apparatus as claimed in Claim 19 wherein the pair of resilient seals comprise O-rings.
21. Apparatus as claimed in Claim 20 wherein the O-ring occupying the second annular chamber has a cross-sectional diameter at least twice that of the other O-ring.
22. Apparatus as claimed in Claim 21, further com-prising a non-telescoping handle mounted on the free end of the tube in coaxial alignment therewith and in slightly spaced relation with the free end of the nut.
23. Apparatus as claimed in Claim 22, further com-prising a second aperture formed in the sidewalls for com-municating the reservoir with an external source of lubricant.
24. Apparatus as claimed in Claim 23, further com-prising an openable, normally closed lubrication fitting fixedly positioned in the second aperture.
25. Apparatus as claimed in Claim 24 wherein the lubrication fitting is flush mounted with the external. sur-face of the nut.
26. In a liquid spray apparatus having a pump body defining a cylindrical chamber open at both ends, means closing one end and communicating the chamber with a source of liquid, a rigid tube slidably disposed within the chamber with a free end extending outwardly therefrom for reciprocably displacing the tube within the chamber, and valve means dis-posed within the closure means and tube for directing a uni-directional flow of liquid through the chamber and tube when the tube is reciprocably displaced, the improvement comprising a packing gland nut engaging the open end of the pump body in longitudinally displaceable relation therewith and sealably closing the open end of the chamber intermediate the body and tube, the nut having sidewalls defining an aperture aligned coaxially with the chamber and through which the tube extends, a pair of resilient seals longitudinally spaced apart and disposed intermediate the sidewalls and tube for slidably supporting the tube in spaced relation with the sidewalls, an annular chamber formed in the sidewalls and defining a lubricant reservoir intermediate the sidewalls, seals, and tube, and a second annular chamber formed in the sidewalls adjacent the innermost end of the nut for retaining one of the seals in restorably compressible axial relation with the open end of the body and in restorably expansible radial relation intermediate the sidewalls and tube to effect an adjustable seal therebetween as the nut is displaced, whereby a lubricant admitted to the reservoir is confined therein by the seals and lubricates the portion of the tube slidably guided by the nut.
27. An improvement as claimed in Claim 26, further comprising a third annular chamber formed in the sidewalls adjacent the free end of the nut for retaining the second one of the seals.
28. An improvement as claimed in Claim 27 wherein the pair of resilient seals comprise O-rings.
29. An improvement as claimed in Claim 28 wherein the O-ring occupying the second annular chamber has a cross-sectional diameter at least twice that of the other O-ring.
30. An improvement as claimed in Claim 29, further comprising a non-telescoping handle mounted on the free end of the tube in coaxial alignment therewith and in slightly spaced relation with the free end of the nut.
31. An improvement as claimed in Claim 30, further comprising first check valve means mounted on the innermost end of the tube and concentrically therewith, the check valve means having an outside diameter greater than that of the tube and lesser than that of the pump chamber to provide substan-tially linear reciprocation of the tube along the axis of the chamber.
32. An improvement as claimed in Claim 31 wherein the check valve means comprises a hexagonal nut having sidewalls threadably connected to corresponding threads on the tube, an end wall closing the tube, an aperture with a chamfered inner edge formed centrally in the end wall, a support member dis-posed diametrically across the tube adjacent the free end thereof, a ball adapted to closably engage the chamfered inner edge and a resilient member intermediate the support member and ball, urging the ball against the chamfered inner edge and maintaining the check valve means normally closed and openable upon application to the ball of pressure ex-ceeding the pressure exerted by the resilient member.
33. An improvement as claimed in Claim 32, further comprising second check valve means having first sidewalls threadably connected to corresponding threads on one end of the body, second sidewalls defining a stepped cylindrical aperture through the second check valve means, the stepped portion being chamfered, a ball freely disposed in the portion of the aperture having the greater diameter and adapted to openably close the aperture upon contact between the chamfered stepped portion and ball, and a resilient, apertured disk overlying the ball and maintaining the ball captive within the aperture.
34. An improvement as claimed in Claim 33, further comprising a second aperture formed in the sidewalls for communicating the reservoir with an external source of lubricant.
35. An improvement as claimed in Claim 34, further comprising an openable, normally closed lubrication fitting fixedly positioned in the second aperture.
36. An improvement as claimed in Claim 35 wherein the lubrication fitting is flush mounted with the external, surface of the nut.
37. An improvement as claimed in Claim 36, further comprising an O-ring disposed concentrically with the tube intermediate the handle and packing gland nut.
38. An improvement as claimed In Claim 37, further comprising an O-ring disposed concentrically with the tube intermediate the packing gland nut and hexagonal nut.
39. A liquid spray apparatus, comprising:
tank means for storing a sprayable liquid;
a pump body defining a cylindrical chamber open at both ends, including means closing one end and communicating the chamber with the stored liquid;
a rigid tube slidably disposed within the chamber with a free end extending outwardly therefrom for reciprocably displacing the tube within the chamber;
valve means disposed within the closure means and tube for directing a unidirectional flow of liquid through the chamber and tube when the tube is reciprocably displaced;
and a packing gland nut engaging the open end of the pump body in longitudinally displaceable relation therewith and sealably closing the open end of the chamber intermediate the body and tube, the nut having sidewalls defining an aperture aligned coaxially with the chamber and through which the tube extends, a pair of resilient seals longitudinally spaced apart and disposed intermediate the sidewalls and tube for slidably supporting the tube in spaced relation with the sidewalls, an annular chamber formed in the sidewalls and defining a lubricant reservoir intermediate the sidewalls, seals, and tube, and a second annular chamber formed in the sidewalls adjacent the innermost end of the nut for retaining one of the seals in restorably compressible axial relation with the open end of the body and in restorably expansible radial relation intermediate the sidewalls and tube to effect an adjustable seal therebetween as the nut is displaced, whereby a lubricant admitted to the reservoir is confined therein by the seals and lubricates the portion of the tube slidably guided by the nut.
tank means for storing a sprayable liquid;
a pump body defining a cylindrical chamber open at both ends, including means closing one end and communicating the chamber with the stored liquid;
a rigid tube slidably disposed within the chamber with a free end extending outwardly therefrom for reciprocably displacing the tube within the chamber;
valve means disposed within the closure means and tube for directing a unidirectional flow of liquid through the chamber and tube when the tube is reciprocably displaced;
and a packing gland nut engaging the open end of the pump body in longitudinally displaceable relation therewith and sealably closing the open end of the chamber intermediate the body and tube, the nut having sidewalls defining an aperture aligned coaxially with the chamber and through which the tube extends, a pair of resilient seals longitudinally spaced apart and disposed intermediate the sidewalls and tube for slidably supporting the tube in spaced relation with the sidewalls, an annular chamber formed in the sidewalls and defining a lubricant reservoir intermediate the sidewalls, seals, and tube, and a second annular chamber formed in the sidewalls adjacent the innermost end of the nut for retaining one of the seals in restorably compressible axial relation with the open end of the body and in restorably expansible radial relation intermediate the sidewalls and tube to effect an adjustable seal therebetween as the nut is displaced, whereby a lubricant admitted to the reservoir is confined therein by the seals and lubricates the portion of the tube slidably guided by the nut.
40. Apparatus as claimed in Claim 39, further com-prising a third annular chamber formed in the sidewalls adjacent the free end of the nut: for retaining the second one of the seals.
41. Apparatus as claimed in Claim 40 wherein the pair of resilient seals comprise O-rings.
42. Apparatus as claimed in Claim 41 wherein the O-ring occupying the second annular chamber has a cross-sectional diameter at least twice that of the other O-ring.
43. Apparatus as claimed in Claim 42, further com-prising a non-telescoping handle mounted on the free end of the tube in coaxial alignment therewith and in slightly spaced relation with the free end of the nut.
44. Apparatus as claimed in Claim 43, further com-prising a second aperture formed in the sidewalls for com-municating the reservoir with an external source of lubricant.
45. Apparatus as claimed in Claim 44, further com-prising an openable, normally closed lubrication fitting fixedly positioned in the second aperture.
46. Apparatus as claimed in Claim 45 wherein the lubrication fitting is flush mounted with the external surface of the nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000398852A CA1169827A (en) | 1982-03-19 | 1982-03-19 | Back pack pump and spray apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000398852A CA1169827A (en) | 1982-03-19 | 1982-03-19 | Back pack pump and spray apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1169827A true CA1169827A (en) | 1984-06-26 |
Family
ID=4122350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000398852A Expired CA1169827A (en) | 1982-03-19 | 1982-03-19 | Back pack pump and spray apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1169827A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5320281A (en) * | 1991-08-06 | 1994-06-14 | Andreas Stihl | Housing for a high-pressure cleaning apparatus |
| US5395052A (en) * | 1991-10-01 | 1995-03-07 | Alfred Karcher Gmbh & Co. | High-pressure cleaning device with pump housing/spray gun connection |
-
1982
- 1982-03-19 CA CA000398852A patent/CA1169827A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5320281A (en) * | 1991-08-06 | 1994-06-14 | Andreas Stihl | Housing for a high-pressure cleaning apparatus |
| US5395052A (en) * | 1991-10-01 | 1995-03-07 | Alfred Karcher Gmbh & Co. | High-pressure cleaning device with pump housing/spray gun connection |
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| MKEX | Expiry |