US4881888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Press for the continuous production of boards
Assignee: Valmet Panelhandling Oy
•
Filing: 1988-09-12
•
Granted: 1989-11-21
•
Expires: 2008-09-12
Abstract
Abstract In a press for the continuous production of boards according to the invention passages (11) are provided between the press belts (1) of the press and the supporting surfaces (10) thereof, said passages being completely filled with bearing balls and merging into return passages (12) so that the balls may carry out complete orbital motions.
Inventors
- 👤 Bo Folkesson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:59
CPC Classifications
B; B30; B30B; B30B5/00; B30B5/04; B30B5/06; B30B5/065; B30B5/067
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A press for the continuous production of boards, in which a board material (6) to be pressed is fed into a press slot between two movable surfaces of which at least one is provided by an endless press belt (1) at the press slot resting on a supporting surface (10) in such a manner that it cannot increase its distance from the opposed moving surface, wherein each press belt (1) and the supporting surface (10) associated therewith define between themselves a passage (11) filled to a maximum capacity thereof with bearing balls and merging into a return passage (12), the balls, when the press is operating, carrying out a complete orbital motion.
Claim 2
Dependent Claim
112 words
A press for the continuous production of boards, in which a board material (6) to be pressed is fed into a press slot between two movable surfaces of which at least one is provided by an endless press belt (1) at the press slot resting on a supporting surface (10) in such a manner that it cannot increase its distance from the opposed moving surface, wherein each press belt (1) and the supporting surface (10) associated therewith define between themselves a passage (11) filled to a maximum capacity thereof with bearing balls and merging into a return passage (12), the balls, when the press is operating, carrying out a complete orbital motion.
Claim 3
Dependent Claim
25 words
The press of claim 1, wherein the ball passages (11, 12) are connected to a source of negative pressure by means of lateral passages (17).
Claim 4
Dependent Claim
30 words
The press of claim 2, wherein the ball passages (11, 12), the lateral passages (17) and the source of negative pressure are at least partially filled with lubricant, preferably oil.
Claim 5
Dependent Claim
10 words
The press of claim 3, wherein the oil is heated.
Claim 6
Dependent Claim
42 words
The press of any preceding claim, further comprising a pair of lateral rails (16) disposed on opposite sides of the return passage (12), and means for urging said rails towards each other to thereby ensure the filling of the passages with balls.
Claim 7
Dependent Claim
25 words
The press of claims 1, 2, 3 or 4, wherein the diameter of the balls is 2-5 times the thickness of the steel belt (1).
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |