|Publication number||US2902035 A|
|Publication date||Sep 1, 1959|
|Filing date||Oct 10, 1958|
|Priority date||Oct 10, 1958|
|Publication number||US 2902035 A, US 2902035A, US-A-2902035, US2902035 A, US2902035A|
|Inventors||Hartley Newell D|
|Original Assignee||Hartley Newell D|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (25), Classifications (11)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Sept. 1, 1959- HARTLEY 2,902,035
SYRINGE Filed Oct. 10, 1958 INVENTOR. NeweZZ D, 17am Z 6) BY M Mk1 ATTORNEYS Unite States The present invention relates to a syringe of the type having a hollow tube or barrel provided with a restricted orifice at one end and with its other end being open to admit a piston. The piston is movable within the tube to provide pressure for ejecting fluids therefrom or a vacuum for introducing fluid through the orifice into the tube.
At present such syringes are generally manufactured with a glass barrel and a glass piston, the outer walls of the piston and inner walls of the barrel are ground to form a sealing fit therebetween, and thus in effect each piston and barrel are mated preventing any intermiXing of the two elements. While these syringes function, such structure is inherently expensive in View of the necessity of forming the sealing fit. In addition, such syringes suffer from the inherent common characteristic of glass, namely being fragile and tending to break even with slight blows.
An object of the present invention is to provide a syringe which is economical to manufacture and reliable in use without requiring a sealing fit to be formed between the barrel and the outer walls of the piston.
Another object of the present invention is to provide a syringe of the above type which has a fragile barrel and a relatively rigid, non-fragile piston and for the minimization of possible breakage of the barrel caused by the piston moving and hitting the barrel.
A further object of the present invention is to enable a barrel of a syringe to have relatively large deviations in dimensions of its inner wall surfaces and to provide a piston with resilient portions which effect a seal therewith irrespective of the deviations, thereby enabling a more economical barrel to be used.
In carrying out the present invention, there is provided a barrel of the type having a restricted orifice at one end, an open end at the other and a piston operable within the barrel. The cross-sectional shape of the inner working portion of the barrel is substantially constant throughout its length, though it may vary within relatively large tolerances for a syringe barrel. The piston has a crosssectional shape which is smaller than the smallest crosssection area of the barrel, and if desired may be many times smaller, it not being essential to the present invention that the working length of the barrel have a constant-shaped or size cross section. Thus a limited amount of movement between the piston and the barrel in a direction perpendicular to the axis of the piston occurs.
In order to form the seal, the piston is provided with a groove adjacent its working end (with the other end being formed to provide a handle) and within this groove there is positioned a ring of resilient material, such as rubber. The normal, outside periphery of the ring is larger than the largest cross-sectional shape of the working length of the barrel and hence upon insertion of the piston within the barrel the ring is compressed and forms a seal between the piston and the barrel.
When the barrel is formed of fragile material, such as glass, and the piston is formed of rigid material, such as atent f Patented Sept. 1, 1959 metal, the ring forms, in addition to a seal, a resilient bumper between the two elements at the place where it is positioned on the piston, thereby preventing the piston from damaging the barrel. However, when the piston is completely or almost completely within the barrel, then the handle end of the working portion of the piston has room to move and has a tendency upon such jarring of the syringe to hit the barrel and cause breakage thereof. This is obviated according to the present invention by forming an annular groove adjacent the handle end of the working portion of the piston and positioning within this groove a ring of resilient material similar to that used at the working end of the piston. This ring serves as a resilient bumper between the barrel and the piston to cushion movement of the piston and prevent it from shattering the fragile barrel.
The second resilient ring in addition to achieving the above object further aids in preventing breakage of the barrel by the piston during use. The second ring also forms a seal with the barrel; however, this seal only occurs when the piston is almost completely within the barrel. This is decidedly advantageous since, as the piston moves into the barrel and approaches its final position, the second ring causes an additional force resisting movement of the piston which tends to prevent the working end of the piston from hitting the restricted end of the barrel with sufiicient force to break the barrel.
While it has been found that one resilient ring is sufficient to form the seal, a third resilient ring may be positioned between the rings at each end of the working portion of the piston if this portion is relatively long or if there is too much play between the piston and the barrel at intermediate positions of the barrel.
Other features and advantages will hereinafter appear.
In the drawings:
Figure 1 is a sectional view taken along an axial section of a syringe constructed according to the present invention.
Fig. 2 is a view of the barrel and its resilient members.
Fig. 3 is a view taken on the line 33 of Fig. 1 in the direction of the arrows.
Referring to the drawing, the syringe of the present invention generally indicated by the reference numeral 10 consists of a hollow barrel 11 and a piston 1'2 operable therein. The barrel ll at one end has inturned portions 13 defining a reduced orifice 14 leading outwardly through a neck 15. A head 16 is formed on the exterior of the neck 15 to increase the sealing engagement thereof with an end portion of a piece of pliable hose 17.
The other end of the barrel is open as at 18 and between the opening 18 and the portions 113 the barrel has a substantially circular cross section as indicated in Fig. 3, though, of course, it may be oval if desired. The inner walls of the barrel 11 between the opening 18 and the inturned portion 13 is referred to as the working portion of the barrel since the piston works within this portion. The cross-sectional shape of the Working portion is substantially identical throughout its length; however, it may have relatively large tolerances (for a syringe barrel) to enable a more economical barrel to be used. Flanges l? are formed adjacent the opening 18 to enable the user to grasp the barrel.
The piston 12, as shown in Fig. 2, has a working or operating portion which is specifically shown as having a substantially cylindrical length for a distance which is approximately equal to the working length of the barrel. A handle 20 is formed at one end of the working portion of the barrel and may have any shape desired; however, in the disclosed embodiment, it is merely a circular knob connected to the working portion.
A radial peripheral groove 21 is formed in the piston adjacent the working end of the piston and a similar portion .ofnthe ebarrel thereby CallSiDg,1.'Wl1H:Ith6f3 rings :1
engage: the. barrel; a compressioinohtheringss;a com-a; pressionzcauses;a seal :betweenvthe ringsxand the: barrel; which im the; case-of .the-..ring:1nearest; the. workingcendsof,
the:-piston:is Sllfi'lClEIli'ztO create a seal between theaba'rrel'il. andithe-piston evenrwith ithe' relatively largextolerancesin. :1
the vcross-sectional:shape of tthe ibarrela It iwillrthusnbezappreciated thamonlyone. :ring (23f)is necessary. lIOCIEEte...
In the: disolosedaembodiment of:the invention zthew barrelc-ll. is formed-f fragile lmaterial; glass; and the a.
piston is formed of anodized aluminum and-hence is :a rigid non-resilient :ma-terial. Wit-h only; a single--O-r1ng adjacent. theworking;.end: of :the .piston-andvwith the piston completely-within the:-ba-rrel,.the other-end of thee:
piston adjacent, the opening 118: can move laterally: This movement or-z play is :such. that .inthe-case *whenvrthe syringe is abruptly moved,-- it may.causebreakageofithe barrelby thepiston-hitting it..
According. to -.-.the.- present; invention;- however, there: silient-iring 24;ser-.ves as a burnperwbetweenthe piston andir the. .barrel' and :obviates breakageg. caused-.zby :lateral :move-:
ment of the piston:
When; in .-=use,: as ..-the. ,piston is introduced:- and forced down thebar-rel towards-the neck portion 15, the only-- resistive force is caused by engagement betweenthei ring 23-1and the. barrel (excluding the effect of any fluid presew sureslsandihence there is a tendency. fort-the piston to :1 maintain its speed andgtothit the portion- .13s With::a.
forceswhich. may. be great enough to break: the portion 13. The ring 24 positioned on the pistons to engagegthe inner .Walls of the barrels .prior to the. piston being: $301111 pletelytwithin the barrel obviatesthis condition -'.by.-in-.-
creasing the resistive force to movement of the piston. Thus. thissecond: ring t24rtendsto prevent the: piston .from hitting the .enchofx the barrel=witht a forceisufficientto break it.
In syringes,.-.which. have.a relatively longworking lengtlnand lsorelativelylong operating lengths .of. the
piston,. it is at,times desirable to addra third resilient member which. may .bean O-ring r25 .positionedbetween Y the:.other..two, preferably centered therebetween .to limit playrofitheltpiston.during, and at its intermediate position.-.. Thisthird .O-ring..which..is similar. to :the rings:
23 and 24 is positioned: and maintainedin a groove 26-.
similar. to the. groovesll and 22 and operates in the samev manneras-thesecond O-ring 24 to perform the.
It will accordinglybe appreciated that there has been disclosed a :syringe that. is relatively economical to manufacture, which. is reliable in use over an extended period andin which the tendency. of a fragile barrel to be broken by. a rigid piston is substantially minimized.
Variations. andmodifications may be made withinthe. scope. of. the. claims andportions of the. improvements may beused without others.
1. A syringe comprising a hollow barrel having a restricted. orificeformed in one end'and the other end beingopenanddefining. an opening having a cross-sectional shape,..said barrel having. an operating length with..its inner walls defining .a cross-sectional shape throughout the.. length which. is substantially identical to .thdcross-sectional shape of the opening,- a piston.
formed .of.relatively..rigid. materiaL-having an operating portion and a handle portion extending. from one end of theroperating portion; the; length of'the operating poraaoaoss t p v.
tion being at least as long as the operating length of the barrel, a peripheral ring -grooveformed in the piston r.- adjacent one end of the operating portion, a second radial peripheral groove formed in the operating portion of the piston and spaced from the first groove a distance slightly less than the operating length of the barrel, and a ring of resilient material positioned and maintained in each groove, the periphenyrof the rings being larger than the periphery of the opening of the barrel and being compressed by the operating length of the barrel upon engagementwtherewith wasathe;operating-length of the piston is inserted into the barrel to cause a seal therebetween:
2. A syringe comprising a .barrel .having a hollow cylindrical operating length provided with a restricted orifice formed in one end and the other end being open and defining a substantially circular opening, a piston formed of relatively rigid material to have an operating portion and-a handle'-portion,-the' operatingportionebeing at least as long: as the-length of the hollow operating length of:the-barrel, a radial peripheral groove formed" in the piston adjacent one end'of theoperating=portion;--" a second radial peripheral groove for'medin thei operating-- portion of the-piston and-spaced tro-m-thefirst groove 'a distance slightly less than the operating length of the barrel,- and-a ring ofaresilient material-positioned=andmaintainedin each groove, the'diaimeter of' the rings-beinglarg Y er than-thediameter of:the opening and -being=com-pressedbythe operating :lehgth oft the barrel upon .tengagement therewith asthe operating -length:of the 'pistonis inserted into the barrel to cause a seal therebetween.
3. 'A syringew' comprising a -hollow barrel havinga restricted-i-orificetormed: in one end rand the'- other '-end 5 being open and defining anaopening-having a cross sec tionalshape; said barrel havinganoperating length with 11 its inner walls defining a cross-sectional shape throughout the'iengthwhich is substantially identical to the cross-sectional shape: of:the opening; a piston formedof relativelw rigidimaterialihaving an operating portionend-a handle portion extendingfrom-zone end of-the' operatingportiony the 1 length not; the operating: portion :beingat least as long astthe:.operating' length ofrthe barreL -a peripheral 1 ring groove. formed; in: :the piston uadjacent i one t end -of theoperatingportion', a second-radial peripheral grooveformed in the operatingaportion' ofthe pistonandspaced fromthe firstgroove-a distance; slightly less than=the operating 'lengthzof:the"barrel',-za third peripheral ring" groove formed in rthei-operatingportion of the piston between the other "two gIO0Y6S,ii&Hd' a ring ofxr'esilient material positioned. and a maintained .iILL each; groove; the peripheryof: the rings being larger than the peripheryof the openingof the. --.barrelianddbeing; compressed: by :the operating length of .the; barrehuponengagement:therewith aszthe operating length.of;.the-.piston:.is.inserted into thebarrel-to cause a seabtherebetween:
4. =A.syringe zcomprisingra barrel havinga hOl-IOVTCYHm? drical: operating-lengthiprovided with: a restricted :orifice formed-.in one endaandihe othervendbeing'topen and-de fin-inga. substantially circulanopening, ;a piston aformed'ofij relatively.rigidrmaterialtmhave an-.operating .portionwand a handle. portion, :the; operating portion; being at: least as-long;as-. the length of:the hollow aoperating length ofi the; barrel, :a radialzperipheral groove formed'in the piston": adjacent .one endofrthejoperating portion;. .a second radialr peripheral grooveformedin. the operatingportion of-theiw piston and; spaced;from;the:first:groove a distancezslighta lyllessthan the operatingwlengthi of the barrel', a third :3 radial peripheralxgroove formed; in the operating '.portion,:i of:the pistombetween.the ;other twogrooves,:and:a ring of resilient material. positioned and; maintained in. reach" z..= groove; thei-diameter ofthe; rings ;.being.;larger than; the: diameter of: :the: opening-and beingv compressed by the: operating length .of the barrel :upon engagement ;ther.ewith l5= as the operating length of the piston is insertedinto 11116 barrel to. causeua seal. :therebetween;
5. The invention as defined in claim 1 in which the rings are toroidal having a circular cross-section and are formed of rubber.
6. The invention as defined in claim 1 in which the barrel is formed of glass and the piston is formed from aluminum.
7. The invention as defined in claim 6 in which the rings are toroidal having a circular cross-section and are formed of rubber.
References Cited in the file of this patent FOREIGN PATENTS 19,848 Great Britain July 24, 1913 749,995 France May 15, 1933 974,009 France Sept. 20, 1950
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|U.S. Classification||604/222, 422/923|
|International Classification||A61M5/315, A61M3/00, B01L3/02|
|Cooperative Classification||A61M5/31513, A61M3/00, B01L3/0217|
|European Classification||A61M5/315C1, B01L3/02C3, A61M3/00|