Patent US3685932A successfully refreshed from Google Patents.
US3685932A
Expired / Lapsed
US
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Heating platen press
Assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
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Filing: 1970-08-27
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Granted: 1972-08-22
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Expires: 1990-08-27
Abstract
Abstract Heatable single or multilevel platen press for the manufacture of wood composition panels or the like, includes a stationary base structure and a hydraulically displaceable structure, each of the structures being composed of a plurality of individual bridge members and rib members interconnecting the bridge members and forming conjointly therewith a grid extending over the entire width of the press; press platens loosely mounted on the grid at the workpiece-side thereof, the rib members having fluid circulation passages for equalizing longitudinal thermal tensions, and the bridge members having fluid circulation passages for equalizing transverse thermal tensions.
Inventors
- 👤 Heinrich Pfeiffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:48
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/06; B30B15/062; B30B15/064; B27; B27N; B27N3/00; B27N3/08; B27N3/20; B27N3/203
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
121 words
Heatable single or multilevel platen press for the manufacture of wood composition panels or the like, comprising a stationary base structure and a hydraulically displaceable structure, each of said structures being composed of a plurality of individual bridge members and rib members interconnecting said bridge members and forming conjointly therewith a grid-like crossbeam extending over the entire width of the press, said crossbeam having a relatively large moment of inertia and being of such dimensions as to transmit the entire compressive force of said structuRes; press platens loosely mounted on said grid at the workpiece-side thereof, said rib members having fluid circulation passages for equalizing longitudinal thermal tensions, and said bridge members having fluid circulation passages for equalizing transverse thermal tensions.
Claim 2
Dependent Claim
121 words
Heatable single or multilevel platen press for the manufacture of wood composition panels or the like, comprising a stationary base structure and a hydraulically displaceable structure, each of said structures being composed of a plurality of individual bridge members and rib members interconnecting said bridge members and forming conjointly therewith a grid-like crossbeam extending over the entire width of the press, said crossbeam having a relatively large moment of inertia and being of such dimensions as to transmit the entire compressive force of said structuRes; press platens loosely mounted on said grid at the workpiece-side thereof, said rib members having fluid circulation passages for equalizing longitudinal thermal tensions, and said bridge members having fluid circulation passages for equalizing transverse thermal tensions.
Claim 3
Dependent Claim
36 words
Heatable platen press according to claim 1, wherein said press platen, said bridge members and said rib members are formed with a plurality of bores located in rows disposed one above the other in a plane.
Claim 4
Dependent Claim
31 words
Heatable platen press according to claim 2, wherein the bores formed in at least one of said platens, said bridge members and said rib members extend perpendicularly to said press platens.
Claim 5
Dependent Claim
41 words
Heatable platen press according to claim 2 having a neutral axis, and wherein small heating plates are mounted between said bridge members on said press platens, for controlling bending of said press platens, said small heating plates being formed with bores.
Claim 6
Dependent Claim
23 words
Heatable platen press according to claim 4 wherein the bores of said small heating plates are comprised of an individual controllable circulatory loop.
Claim 7
Dependent Claim
41 words
Heatable platen press according to claim 1 having a neutral axis, and wherein said rib members are divided in two and are formed of counter-heating rib members and operatively heating rib members for separating the heat flow about the neutral axis.
Claim 8
Dependent Claim
60 words
Heatable platen press according to claim 6 wherein the bores formed in said press platens, the bores formed in said bridge members below said neutral axis and the bores formed in said rib members are combined into a single safety circulatory loop for said operative heating while the bores located above said neutral axis form a circulatory loop for counter-heating.
Claim 9
Dependent Claim
60 words
Heatable platen press according to claim 6 wherein the bores formed in the bridge members adjacent said press platens are combined into a controllable circulatory loop, and the bores formed in said press platens, the bores formed in the remainder of said bridge members and the bores formed in said rib members form a safety circulatory loop for operative heating.
Claim 10
Dependent Claim
29 words
Heatable platen press according to claim 6 wherein, respectively, the bores formed in said press platens, said bridge members and said rib members form an individual controllable circulatory loop.
Claim 11
Dependent Claim
35 words
Heatable platen press, according to claim 1 wherein said bridge members, from the middle thereof to the marginal edges thereof are provided with a decreasing number of bores spaced increasingly farther apart from one another.
Claim 12
Dependent Claim
32 words
Heatable platen press according to claim 1 having a neutral axis, including heat expansion openings formed in said bridge members and in said rib members and symmetrically disposed about the neutral axis.
Claim 13
Dependent Claim
119 words
Heatable platen press according to claim 1 having a neutral axis, and wherein said rib members are divided in two and are formed of counter-heating rib members and operatively heating rib members for separating the heat flow about the neutral axis, the bores formed in the bridge members adjacent said press platens being combined into a controllable circulatory loop, and the bores formed in said press platens, the bores formed in the remainder of said bridge members and the bores formed in said rib members forming a safety circulatory loop for operative heating, said rib members having a temperature several degrees C higher than the temperature of said bridge members which are subjected to the circulatory loop for counter-heating.
Claim 14
Dependent Claim
29 words
Heatable platen press according to claim 12 wherein said bridge members are shaped according to the course of the stress by the bending moment, and have a trapezoidal section.
Claim 15
Dependent Claim
26 words
Heatable platen press according to claim 13 wherein said trapezoidal section of said bridge members are formed with bores extending at an angle to the horizontal.
Claim 16
Dependent Claim
22 words
Heatable platen press according to claim 14 wherein the bores formed in said trapezoidal sections are combined into an individual circulatory loop.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |