# US 3,981,415 A · Dispenser with expansible member and contracting fabric

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- Number: US 3,981,415 A
- Document ID: US3981415A
- Status: Granted
- Kind: A
- Application number: 05/626,964
- Filed: 1975-10-29
- Granted: 1976-09-21
- Earliest claimed: 1975-10-29
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: John Rayford Fowler; Edward Merrick Hogan
- Web page: https://patentgrep.com/patent/US3981415A

## CPC

- D04B 21/18: incorporating elastic threads
- B65D 83/7711: {the contents of a flexible bag being expelled by the contracting forces inherent in the bag or a sleeve fitting snugly around the bag}
- B65D 2231/004: comprising rods or tubes provided with radial openings, ribs or the like, e.g. dip-tubes, spiral rods
- D04B: KNITTING
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES

## Abstract

A fluid dispensing container of the volume-expansible bag type is provided wherein the force for dispensing fluid is provided by the contracting force of an expansible fabric having elastomer yarn in the direction of contraction disposed about the volume-expansible bag.

## Claims

### Claim 1

In a fluid dispensing container comprising a volume-expansible member for receiving and holding said fluid and means for forcing said volume-expansible member to contract in volume so as to dispense said fluid therefrom, the improvement comprising an expansible fabric disposed about said volume-expansible member and having a uni-directional recovery force to contract said volume-expansible member sufficiently to substantially empty it of said fluid, thereby serving as said forcing means, said fabric comprising elastomer yarn supplying said recovery force to said fabric and yarn in engagement with said elastomer yarn to maintain the position of said elastomer yarn in the fabric during expansion and contraction of said fabric so as to prevent blow-out of said volume-expansible member.

### Claim 2 (depends on 1)

In the fluid dispensing container of claim 1 wherein said fabric is tubular in shape.

### Claim 3 (depends on 2)

In the fluid dispensing container of claim 2 wherein the direction of contraction is primarily along the axis of the tubular shape of the fabric and the elastomer yarn is in said direction in said fabric.

### Claim 4 (depends on 2)

In the fluid dispensing container of claim 2 wherein the direction of contraction is primarily in the circumference of said tubular shape of the fabric and the elastomer yarn is in said direction in said fabric.

### Claim 5 (depends on 2)

In the fluid dispensing container of claim 2 wherein the end of the tubular shape of the fabric away from the end where the fluid is dispensed is constricted.

### Claim 6 (depends on 1)

In the fluid dispensing container of claim 1 wherein said fabric is a knit fabric.

### Claim 7 (depends on 1)

In the fluid dispensing container of claim 1 wherein the yarn maintaining the position of the elastomer yarn in the fabric is non-stretch yarn.

### Claim 8 (depends on 1)

In the fluid dispensing container of claim 1 wherein said elastomer yarn is present in said fabric at at least 20,000 denier per cm of fabric width in the cross direction to the elastomer yarn.

### Claim 9 (depends on 8)

In the fluid dispensing container of claim 8 wherein said fabric has a recovery force at 100% elongation of at least 250 g per cm of fabric width in the cross direction to the elastomer yarn.

### Claim 10 (depends on 9)

In the fluid dispensing container of claim 9 wherein said elastomer yarn has a denier of at least 8000.