# US 11,305,467 B2 · Toggled roll stack

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- Number: US 11,305,467 B2
- Document ID: US11305467B2
- Status: Granted
- Kind: B2
- Application number: 16/602,983
- Filed: 2020-01-08
- Published: 2021-07-08
- Granted: 2022-04-19
- Earliest claimed: 2020-01-08
- Assignees: Mega Machinery, Inc.
- Applicants: Mega Machinery, Inc.
- Inventors: Richard Risch; Roger A. Blaney
- Web page: https://patentgrep.com/patent/US11305467B2

## CPC

- B29C 43/24: Calendering
- B29C 33/24: using hydraulic or pneumatic means
- B29C 43/46: Rollers
- B29C 45/82: Hydraulic {or pneumatic} circuits
- B29C 48/0011: {combined with compression moulding}
- B29C 48/08: flexible, e.g. films
- B29C 43/245: {Adjusting calender parameters, e.g. bank quantity}
- B29C 48/305: having a wide opening, e.g. for forming sheets
- B29C 59/04: using rollers or endless belts
- B29C 2043/467: {plurality of rollers arranged in a specific manner in relation to each other}
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

A roll stack for the production of plastic sheeting uses a pneumatically-operated toggle joint, instead of a hydraulic press, to precisely separate two rollers. The pneumatically-operated toggle joint allows the rollers to be more quickly and safely further separated from each other in case there is an emergency.

## Claims

### Claim 1

A roll stack, comprising, in combination:
(a) a first roller;
(b) a second roller;
(c) a slide supporting the first roller;
(d) a machine screw actuator situated to slide the slide to separate the first roller and the second roller to form a separation of a desired thickness;
(e) a pivot supporting the second roller;
(f) a toggle situated to rotate the pivot, the toggle including a joint;
(g) a moderate-pressure lifting device operatively connected to the joint; and
(h) a stop situated to stop the joint when the joint attains an exterior angle of 180 to 190 degrees.

### Claim 2 (depends on 1)

The roll stack according to claim 1, wherein the lifting device comprises a pneumatic cylinder.

### Claim 3 (depends on 1)

The roll stack according to claim 1, wherein the lifting device comprises an eccentric.

### Claim 4 (depends on 1)

The roll stack according to claim 1, wherein the lifting device comprises an electromagnet.

### Claim 5 (depends on 1)

The roll stack according to claim 1, wherein the lifting device comprises a wedge-and-wheel combination.

### Claim 6 (depends on 1)

The roll stack according to claim 1, wherein the lifting device comprises a spring.

### Claim 7 (depends on 1)

The roll stack according to claim 1, wherein the lifting device comprises an air bag inflated by an electrically-powered compressor.

### Claim 8 (depends on 1, 2, 3, 4, 5, 6, 7)

A method for making plastic sheeting, comprising, in combination:
(a) inserting molten plastic into the separation of the roll stack according to any of claims 1 through 7; and
(b) rolling the first and second rollers to draw the plastic through the separation.