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Publication numberUS3237815 A
Publication typeGrant
Publication dateMar 1, 1966
Filing dateJun 5, 1964
Priority dateJun 5, 1964
Publication numberUS 3237815 A, US 3237815A, US-A-3237815, US3237815 A, US3237815A
InventorsOgle Robert W
Original AssigneeV P P Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Universal plunger
US 3237815 A
Images(1)
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Description  (OCR text may contain errors)

March 1,

R. W. OGLE UNIVERSAL PLUNGER Filed June 5, 1964 Era. 2.

IN VEN TOR.

United States Patent 3,237,815 UNIVERSAL PLUNGER Robert W. Ogle, Phoenix, Ariz., assignor to V.P.P. Inc., a corporation of Delaware Filed June 5, 1964, Ser. No. 372,875 Claims. (Cl. 222386) This invention relates to a plunger for a syringe adapted to be preloaded with a single dose of a medicament. While more generally applicable, the plunger of this nvention is particularly adapted for use in syringes having a glass barrel in which is preloaded a single dose of a medicament and therefore, while the barrel is formed of glass, the plunger is preferably formed of rubber, as both glass and rubber are compatible over long periods of time with most of the medicaments with which it is desired to load the syringe.

Experience has shown, however, that a hollow plunger formed of thin walled rubber is likely to be unstable when used in that it can bend or collapse.

Accordingly, it is a feature of this invention that a plunger is provided formed essentially of rubber, but having a still plastic or metal liner throughout the major portion of the plunger to prevent the same from bending or buckling.

These and other features, objects and advantages of the present invention will be apparent from the annexed specification in which:

FIGURE 1 is a side view partly in section through a fragmentary syringe barrel and the plunger embodying the present invention;

FIGURE 2 is a section taken along the line 22 of FIGURE 1;

FIGURE 3 is a section taken along the line 33 of FIGURE 2; and

FIGURE 4 is a perspective elevation of the liner.

Referring now more particularly to the drawings, the invention consists of a plunger formed of rubber and having a wall 11 which is relatively thin compared to the dimension of the hollow interior of the plunger. The plunger has four stiffening ribs 12 running longitudinally thereof and at its bottom end is provided with a V-shaped closed end 14. A pair of rings 15 and 16 are formed near the bottom of the plunger 10 and the outer diameter of the rings 15 and 16 is received in the barrel 17 with a press lit and seals the plunger to the interior of the barrel.

The upper end of the plunger is provided with a bead 18 and an inwardly extending portion of the bead 19 forms a shoulder 20. A liner 21 preferably of a stiff plastic such as polystyrene, but if desired, formed of metal such as aluminum is provided. The liner 21 is in the shape of a hollow cylinder open at both ends and the upper end of the liner 21 seats on the shoulder and the lower end seats on the shoulder 22 formed by the inwardly extending ring 23 opposite the ring 16. It has been found in practice that by using the liner 21 with respect to the otherwise all rubber plunger 10 any tendency to buckle is avoided, but still there is nothing in contact with the medicament other than the glass forming the barrel 17 and the rubber of the plunger.

While there has been described what is at present considered a preferred embodiment of the present invenice tion, it will be appreciated by those skilled in the art that various changes and modifications can be made therein without departing from the essence of the invention and it is intended to cover herein all such changes and modifications as come within the true spirit and scope of the appended claims.

I claim:

1. A plunger for a syringe having a hollow barrel comprising: a generally cylindrical member having a closed lower end and an open upper end; near said lower end a plurality of outwardly extending rings on said cylindrical member adapted to engage the inner wall of a syringe barrel; a head on the open end of said cylindrical member a portion of which extends inwardly and forms a shoulder; the uppermost of said rings having a portion extending inwardly and forming a shoulder and a stiff cylindrical liner in said cylindrical member, fitting the inner wall thereof and seated at each end on one of said shoulders.

2. A plunger as set forth in claim 1 in which said liner is formed of polystyrene plastic.

3. A plunger as set forth in claim 1 in which said liner is formed of aluminum.

4. A plunger for a syringe having a hollow barrel comprising: a generally cylindrical rubber member having a closed lower end and an open upper end; near said lower end a plurality of outwardly extending rings on said cylindrical member adapted to engage the inner wall of a syringe barrel; a bead on the open end of said cylindrical member, a portion of which extends inwardly and forms a shoulder; the uppermost of said rings having a portion extending inwardly and forming a shoulder, and a stiff cylindrical liner in said cylindrical member, fitting the inner wall thereof and seated at each end on one of said shoulders.

5. A plunger for a syringe having a hollow barrel comprising: a generally cylindrical rubber member having a closed V-shaped lower end and an open upper end; a plurality of stiifening ribs running longitudinally of said member; near said lower end a plurality of outwardly extending rings on said cylindrical member, said rings extending beyond the ribs and being adapted to engage the inner wall of a syringe barrel; a head on the open end of said cylindrical member, a portion of which extends inwardly and forms a shoulder; the uppermost of said rings having a portion extending inwardly and forming a shoulder, and a stifi cylindrical liner in said cylindrical member, fitting the inner wall thereof and seated at each end on one of said shoulders.

References Cited by the Examiner UNITED STATES PATENTS 2,607,342 8/1952 Abel 128218 2,832,340 4/1958 Darin et a1. 1282l8 2,895,773 7/1959 McConnaughey 30923 3,028,052 4/1962 Archer 222386 X 3,050,059 8/1962 Wall et al l28218 3,098,483 7/1963 Nielsen 1Z8220 3,150,801 9/1964 Hamilton 128218 X LOUIS I. DEMBO, Primary Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,237,815 March 1, 1966 Robert W. Ogle It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

In the grant line 2 and line 11, and in the heading to the printed speclficatlon, line 3, for "VCP.P.", each occurrence, read U.PPfl L Signed and sealed this 19th day of September 1967.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD J. BRENNER Attesting Officer Commissioner of Patents

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2607342 *Nov 24, 1950Aug 19, 1952Martin S AbelSyringe
US2832340 *Mar 26, 1957Apr 29, 1958American Home ProdSyringe push rod
US2895773 *Oct 22, 1956Jul 21, 1959Robert K McconnaugheyVariable diameter tensed ring piston
US3028052 *Jun 1, 1959Apr 3, 1962John E ArcherMold-filling device
US3050059 *May 25, 1959Aug 21, 1962Baxter Don IncHypodermic syringe
US3098483 *Dec 29, 1961Jul 23, 1963Leo Pharm Prod LtdTwo-compartment hypodermic syringe for separate storing of more components
US3150801 *Sep 6, 1960Sep 29, 1964Hamilton Clark HSyringe
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3705582 *Sep 23, 1969Dec 12, 1972Koenig Elmer ABreech loaded syringe and method of breech loading same
US3706400 *Dec 21, 1970Dec 19, 1972Zyma SaDistributor apparatus
US4201209 *May 24, 1978May 6, 1980Leveen Harry HMolded hypodermic plunger with integral shaft and elastomeric head
US4245654 *Mar 22, 1977Jan 20, 1981Concord Laboratories, Inc.Blood sampling syringe
US4365440 *Jul 23, 1981Dec 28, 1982J. J. Mauget Co.Leakage resistant container for plant injection apparatus
US4501192 *Sep 15, 1982Feb 26, 1985Walter Graf U. Co Gmbh & Co.Piston for precision dosing instrument
US4633765 *Dec 10, 1984Jan 6, 1987Walter Graf U. Co Gmbh & Co.Sleeve-core piston
US4708270 *May 16, 1986Nov 24, 1987Loctite CorporationDripless syringe
CN101466614BJun 12, 2007May 1, 2013诺信公司Liquid dispensing syringe
EP0075670A1 *Jul 21, 1982Apr 6, 1983Walter Graf u. Co. GmbH & Co.Piston for a precision dosing device
EP2223868A1 *Jun 12, 2007Sep 1, 2010Nordson CorporationLiquid dispensing syringe
WO1979001111A1 *May 18, 1979Dec 13, 1979H LeveenPlunger for hypodermic syringe having integrally molded shaft and head and method for making
WO2007146921A2 *Jun 12, 2007Dec 21, 2007Nordson CorpLiquid dispensing syringe
Classifications
U.S. Classification222/386, 604/222
International ClassificationF16J1/00
Cooperative ClassificationF16J1/006
European ClassificationF16J1/00C2