IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0546489
(2014-11-18)
|
등록번호 |
US-9849248
(2017-12-26)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Tessy Plastics Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
14 |
초록
▼
A dispenser assembly is provided that has a rigid plunger with a ring-shaped protrusion. The protrusion contacts the inner wall of a flexible barrel to form a liquid-tight seal. Advantageously, the dispenser assembly does not require additional components, such as o-rings, and can be fabricated by i
A dispenser assembly is provided that has a rigid plunger with a ring-shaped protrusion. The protrusion contacts the inner wall of a flexible barrel to form a liquid-tight seal. Advantageously, the dispenser assembly does not require additional components, such as o-rings, and can be fabricated by injection molding techniques.
대표청구항
▼
1. A dispenser assembly comprising: a plunger with a first diameter, the plunger formed from a first polymeric material and comprising a rigid ring-shaped protrusion that extends in a radial direction from an outer surface of the plunger to define a second diameter, the rigid ring-shaped protrusion
1. A dispenser assembly comprising: a plunger with a first diameter, the plunger formed from a first polymeric material and comprising a rigid ring-shaped protrusion that extends in a radial direction from an outer surface of the plunger to define a second diameter, the rigid ring-shaped protrusion being disposed proximate a distal end of the plunger, wherein the plunger has a first flexibility; anda barrel formed from a second polymeric material that is different than the first polymeric material, the barrel being configured to flex outward in response to a radial force applied by the rigid ring-shaped protrusion, and wherein a portion of the barrel is compressed onto the rigid ring-shaped protrusion to provide a liquid-tight seal between the plunger and the barrel. 2. The dispenser assembly as recited in claim 1, wherein the first diameter of the plunger is less than a third diameter of the barrel such that the plunger is undercut relative to the barrel. 3. The dispenser assembly as recited in claim 1, wherein the plunger is undercut, relative to the barrel, by between 0.0025 inches and about 0.010 inches. 4. The dispenser assembly as recited in claim 1, wherein the plunger is undercut, relative to the barrel, by between 0.0025 inches and about 0.010 inches and the rigid ring-shaped protrusion extends in the radial direction from the outer surface of the plunger by a distance between 0.0025 inches and about 0.010 inches to define the second diameter. 5. The dispenser assembly as recited in claim 1, wherein the plunger is a hollow tube that comprises a top opening. 6. The dispenser assembly as recited in claim 1, wherein the plunger is a hollow tube that comprises a top opening and the barrel comprises a barrel wall with a first thickness, the plunger comprises a plunger wall with a second thickness, and the first thickness is less than the second thickness such that the barrel wall is more flexible than the plunger wall. 7. The dispenser assembly as recited in claim 1, wherein the first polymeric material is high density polyethylene (HDPE) and the second polymeric material is polypropylene (PP). 8. The dispenser assembly as recited in claim 1, wherein the plunger consists of the first polymeric material such that the plunger is free of o-rings. 9. The dispenser assembly as recited in claim 1, further comprising a plunger flange proximate a top opening of the plunger. 10. The dispenser assembly as recited in claim 1, further comprising a barrel flange proximate a top opening of the barrel. 11. The dispenser assembly as recited in claim 1, wherein the plunger, including the rigid ring-shaped protrusion, is monolithic. 12. The dispenser assembly as recited in claim 1, wherein the second polymeric material has a flexural modulus of less than 1200 MPa. 13. The dispenser assembly as recited in claim 1, wherein the second polymeric material has a flexural modulus between 500 MPa and 1200 MPa. 14. The dispenser assembly as recited in claim 1, wherein the first polymeric material has a first flexural modulus and the second polymeric material has a second flexural modulus, the second flexural modulus being between 500 MPa and 1200 MPa and the first flexural modulus is at least 200 MPa different from the second flexural modulus. 15. The dispenser assembly as recited in claim 1, wherein the first polymeric material has a first flexural modulus and the second polymeric material has a second flexural modulus, the second flexural modulus being between 500 MPa and 1200 MPa and the first flexural modulus is at least 500 MPa different from the second flexural modulus. 16. The dispenser assembly as recited in claim 1, wherein the barrel has a wall thickness between about 0.014 inches and about 0.022 inches. 17. The dispenser assembly as recited in claim 1, wherein the barrel has a wall thickness between about 0.017 inches and about 0.019 inches. 18. A dispenser assembly consisting of: a plunger with a first diameter, the plunger formed from a first polymeric material and comprising a rigid protrusion that extends in a radial direction from an outer surface of the plunger to define a second diameter, the rigid protrusion being disposed proximate a bottom end of the plunger, wherein the plunger has a first flexibility; anda barrel formed from a second polymeric material defining a third diameter that is greater than the first diameter, wherein the barrel has a second flexibility that is more flexible than the first flexibility and is configured to flex outward when the rigid protrusion tensions the barrel in the radial direction to define a diameter that is larger than the third diameter, and provide a liquid-tight seal between the plunger and the barrel. 19. The dispenser assembly as recited in claim 18, wherein the first polymeric material has a first flexural modulus and the second polymeric material has a second flexural modulus, the second flexural modulus being between 500 MPa and 1200 MPa and the first flexural modulus is at least 500 MPa different from the second flexural modulus. 20. A method of forming a seal between a plunger having a rigid annular protrusion and a flexible hollow barrel having an inner wall, the method comprising: inserting the plunger into the flexible hollow barrel; andcontacting the inner wall of the flexible hollow barrel with the rigid annular protrusion;wherein a portion of the flexible hollow barrel is pulled onto the rigid annular protrusion when a vacuum is applied due to actuation of the plunger, the vacuum assisting in compressing the portion of the flexible hollow barrel onto the rigid annular protrusion.
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