# US 4,393,766 A · Belt press with hose-type actuator

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- Number: US 4,393,766 A
- Document ID: US4393766A
- Status: Granted
- Kind: A
- Application number: 06/286,670
- Filed: 1981-07-24
- Granted: 1983-07-19
- Earliest claimed: 1980-07-26
- Assignees: Wagener Schwelm GmbH & Co.
- Inventors: Peter Thies
- Web page: https://patentgrep.com/patent/US4393766A

## CPC

- B29C 73/00: Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D ({linings for tyres acting locally B60C5/142;} retreading tyres B29D30/54; devices for covering leaks in pipes or hoses F16L55/16)
- B29C 65/18: using heated tools
- B29C 66/4324: {for making closed loops, e.g. belts}
- B29C 66/72141: {Fibres of continuous length}
- B29C 66/81422: {being convex}
- B29C 66/81423: {being concave}
- B29C 66/81463: {comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint}
- B29C 66/8161: {said pressing elements being supported or backed-up by springs or by resilient material}
- B29C 66/81611: {by resilient material}
- B29C 66/81821: {of the welding jaws}
- B29C 66/82421: {using an inflatable element positioned between the joining tool and a backing-up part}
- B29C 66/83221: {cooperating reciprocating tools, each tool reciprocating along one axis}
- B29C 66/855: {Belt splicing machines}
- B29C 66/92211: {with special measurement means or methods}
- B30B 1/003: {by an elastic bag or diaphragm expanded by fluid pressure}
- F16G 3/00: Belt fastenings, e.g. for conveyor belts (for V-belts F16G7/00)
- B29C 66/8122: {characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps}
- B29L 2031/709: {Articles shaped in a closed loop, e.g. conveyor belts}
- 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)
- B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)}
- F16G: BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A belt press comprises a plurality of upper and a plurality of lower traverses respectively having lower and upper traverse faces, upper and lower press platens carried on and between these traverses and having respective upper and lower platen faces respectively confronting the lower and upper traverse faces, and a hydraulic actuator for displacing these traverses toward each other and thereby pressing the platens against a belt engaged therebetween. The hydraulic actuator is engaged between one of the platen faces and the confronting traverse face and has a pressure plate bearing on the one platen face, a plurality of diametrally compressible but circumferentially unstretchable hydraulic hoses forming at least one substantially closed chamber and bearing in one direction in surface contact on the pressure plate and in the opposite direction in surface contact at least indirectly on the confronting traverse face, and a system for pressurizing this chamber. The hoses have in uncompressed condition a predetermined hose diameter but are partially flattened between the plate and the confronting traverse face so as to engage same in the above-described surface contact.

## Claims

### Claim 1

A belt press comprising:
a plurality of upper and a plurality of lower traverses respectively having lower and upper traverse faces;
respective upright tie bolts extending vertically between said upper and lower traverses and securing said lower traverses to the respective upper traverses;
upper and lower press platens carried on and between said traverses and having respective upper and lower platen faces respectively confronting said lower and upper traverse faces;
hydraulic actuating means for displacing said traverses toward each other and thereby pressing said platens against a belt engaged therebetween, said means being engaged between one of said platen faces and the confronting traverse face and having
a pressure plate bearing on said one platen face,
a plurality of diametrically compressible but circumferentially unstetchable hydraulic hoses forming at least one substantially closed chamber and bearing in one direction in surface contact on said pressure plate and in the opposite direction in surface contact at least indirectly on said confronting traverse face, said hoses having in uncompressed condition a predetermined hose diameter but being partially flattened between said plate and said confronting traverse face, and
means for pressurizing said chamber;
means for displacement of said plate toward and away from said confronting traverse face only through a distance substantially shorter than said diameter; and
at least one bend-compensating element having a pair of nonparallel upper and lower surfaces and engaged between said hydraulic actuating means and one of the respective faces.

### Claim 2 (depends on 1)

The belt press defined in claim 1 wherein the cross-sectional area of said hoses in said actuating means is equal to between 70% and 80% of the cross-sectional area of said hoses in uncompressed condition.

### Claim 3 (depends on 1)

The belt press defined in claim 1 wherein said hoses are all interconnected to form a single such chamber.

### Claim 4 (depends on 2)

The belt press defined in claim 2 wherein said hoses extend transverse to said traverses.

### Claim 5 (depends on 2)

The belt press defined in claim 2 wherein said hoses extend generally parallel to said traverses and are aligned thereunder.

### Claim 6 (depends on 5)

The belt press defined in claim 5 wherein said hoses of each of said plates engage each other laterally.

### Claim 7 (depends on 1)

The belt press defined in claim 1 wherein said plate is of thermally insulating material.

### Claim 8 (depends on 1)

The belt press defined in claim 1, further comprising a pressure gauge for indicating the pressure in said chamber.

### Claim 9 (depends on 1)

The belt press defined in claim 1 wherein said hoses are normally of circular cross section and are formed of a filament-reinforced elastomer.

### Claim 10 (depends on 1)

The belt press defined in claim 1 wherein each of said plates is of U-section and laterally contains the respective hoses.