US3670790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Veneer machine roller pressure bar assembly
Assignee: Canadian Patents and Development Ltd
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Filing: 1971-02-03
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Granted: 1972-06-20
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Expires: 1991-02-03
Abstract
Abstract A veneer pressure bar assembly is provided wherein the pressure bar or back-up rollers for the pressure bar are supported by hydrostatic lubrication in a housing. The lubricant which may be oil, water, oil and water, or air is fed to at least three slot shaped pockets extending along two paths along the housing (at least one slot along one path and at least two along the other path) on each side of the resultant force on the roller being lubricated. The slot or slots along each path occupy a major portion of that path.
Inventors
- 👤 Andrew W Porter
- 👤 John L Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:43
CPC Classifications
B; B27; B27L; B27L5/00; B27L5/02; B27L5/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
198 words
A veneer machine roller pressure bar assembly, comprising a housing having a longitudinally extending roller retaining, generally arcuate shaped cavity providing a roller bar bearing surface with lubricating pockets, said lubricating pockets each being separately bounded by said bearing surface, a roller rotatably supported in said cavity for substantially the load bearing length of said roller and as a sliding fit with said bearing surface, fluid restrictor means connected to fluid inlets to said pockets, and means for delivering lubricant fluid via said fluid restrictor means to said pockets at approximately a constant pressure to maintain a film of escaping lubricant fluid between said bearing surface and said roller, for hydrostatic lubrication of said roller, and wherein said lubricating pockets are in the form of slots, at least one of said pockets extends along a first longitudinal path along said cavity at least two of said pockets extend along a second longitudinal path of said cavity, said first and said second paths are parallel to and circumferentially spaced on either side of the resultant force on said roller when it is in operation, and the pocket lengths occupy a major portion of the length of the bearing surface.
Claim 2
Dependent Claim
198 words
A veneer machine roller pressure bar assembly, comprising a housing having a longitudinally extending roller retaining, generally arcuate shaped cavity providing a roller bar bearing surface with lubricating pockets, said lubricating pockets each being separately bounded by said bearing surface, a roller rotatably supported in said cavity for substantially the load bearing length of said roller and as a sliding fit with said bearing surface, fluid restrictor means connected to fluid inlets to said pockets, and means for delivering lubricant fluid via said fluid restrictor means to said pockets at approximately a constant pressure to maintain a film of escaping lubricant fluid between said bearing surface and said roller, for hydrostatic lubrication of said roller, and wherein said lubricating pockets are in the form of slots, at least one of said pockets extends along a first longitudinal path along said cavity at least two of said pockets extend along a second longitudinal path of said cavity, said first and said second paths are parallel to and circumferentially spaced on either side of the resultant force on said roller when it is in operation, and the pocket lengths occupy a major portion of the length of the bearing surface.
Claim 3
Dependent Claim
44 words
An assembly according to claim 1, wherein said pockets are symmetrically placed at an angle within the range 10* to 70* on either side of the resultant force on said roller of the applied forces on said roller when the assembly is in operation.
Claim 4
Dependent Claim
25 words
An assembly according to claim 2, wherein said upper pockets are placed at an angle of substantially 37* on either side of said resultant force.
Claim 5
Dependent Claim
37 words
An assembly according to claim 1, wherein there are an even number of said pockets disposed with one half of said number along one of said longitudinal paths, and the other half along the other said path.
Claim 6
Dependent Claim
28 words
An assembly according to claim 1, wherein said means for delivering lubricant delivers a lubricant selected from the group water, oil, a water and oil mixture and air.
Claim 7
Dependent Claim
58 words
An assembly according to claim 1, wherein said generally arcuate shaped cavity is one of two similar generally arcuate shaped cavities having said pockets, said roller is one of two similar rollers forming back-up rollers disposed Side-by-side in said cavities, and said housing rotatably houses a pressure bar roller in contact with and supported by said back-up rollers.
Claim 8
Dependent Claim
58 words
An assembly according to claim 1, wherein said means for delivering lubricant to said pockets comprises a lubricant pump, and for each pocket the same type of fluid restrictor selected from the group comprising a needle valve, orifice, capillary, pressure sensing valve, a constant flow control valve connects the lubricant outlet from a lubricant pump to that pocket.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |