US3581880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyor
Assignee: Nordstroms Linbanor AB
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Filing: 1969-01-30
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Granted: 1971-06-01
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Expires: 1989-01-30
Abstract
Abstract A conveyor of the type which comprises at least one goodssupporting beam movably arranged in a track or guideway which extends in a fixed support surface along the conveying path and which is adapted to be passed with its goods-supporting surface above said stationary support surface in the conveying direction and beneath said stationary support surface in the opposite direction.
Inventors
- 👤 Per Iversen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:47
CPC Classifications
B; B65; B65G; B65G25/00; B65G25/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
250 words
A conveyor for installation in a track opening in a stationary surface comprising rail means installed beneath said track opening, a chassis engaging said rail means and movable thereon, a body member carried by said chassis, said body member having a load support beam and being movable with respect to said chassis between a lowered position and a raised position above said lowered position wherein said load support beam extends upwardly through said track opening above said stationary support surface, a drive sprocket wheel and a tension sprocket wheel spaced apart along said rail means, a chain for moving said chassis on said track looped about said drive sprocket wheel said tension sprocket wheel, said chain having one end attached to said chassis and the other end attached to said body member, whereby said chain can pull said chassis and said body member in either direction along said rail, means for driving said drive sprocket wheel, elevating means responsive to the tension applied to said chain interposed between said chassis and said body member, said elevating means moving said body member from one of said positions to the other of said positions when said chain is tensioned to a predetermined degree and from said other of said positions to said one of said positions when the tension is relaxed, and ram means operatively connected to said tension sprocket wheel for varying the distance between said drive sprocket wheel and said tension sprocket wheel to alter the tension on said chain.
Claim 2
Dependent Claim
250 words
A conveyor for installation in a track opening in a stationary surface comprising rail means installed beneath said track opening, a chassis engaging said rail means and movable thereon, a body member carried by said chassis, said body member having a load support beam and being movable with respect to said chassis between a lowered position and a raised position above said lowered position wherein said load support beam extends upwardly through said track opening above said stationary support surface, a drive sprocket wheel and a tension sprocket wheel spaced apart along said rail means, a chain for moving said chassis on said track looped about said drive sprocket wheel said tension sprocket wheel, said chain having one end attached to said chassis and the other end attached to said body member, whereby said chain can pull said chassis and said body member in either direction along said rail, means for driving said drive sprocket wheel, elevating means responsive to the tension applied to said chain interposed between said chassis and said body member, said elevating means moving said body member from one of said positions to the other of said positions when said chain is tensioned to a predetermined degree and from said other of said positions to said one of said positions when the tension is relaxed, and ram means operatively connected to said tension sprocket wheel for varying the distance between said drive sprocket wheel and said tension sprocket wheel to alter the tension on said chain.
Claim 3
Dependent Claim
41 words
A conveyor according to claim 1, wherein said elevating means moves said body member from said lowered position to said raised position when said chain is tensioned and from said raised position to said lowered position when the tension is relaxed.
Claim 4
Dependent Claim
18 words
A conveyor according to claim 1, further comprising spring means biasing said body member toward said lowered position.
Claim 5
Dependent Claim
63 words
A conveyor according to claim 1, wherein said elevating means comprises a plurality of wheels mounted on said chassis and a plurality of wedge-shaped cams mounted on said body member and engaging said wheels, whereby in response to the tension applied to said chain said cams roll upon said wheels to vary the position of said body member with respect to said chassis.
Claim 6
Dependent Claim
15 words
A conveyor according to claim 1 wherein the loop formed by said chain extends horizontally.
Claim 7
Dependent Claim
110 words
A plurality of conveyors each according to claim 1 wherein said drive sprocket wheel of each of said conveyors is mounted on a common drive shaft with said drive sprocket wheel of each of the other of said plurality of conveyors and said tension sprocket wheel of each of said conveyors is mounted on a common tension shaft with said tension sprocket wheel of each of the others of said plurality of conveyors, said common drive shaft being driven by a common drive means and said common tension shaft being operated by a common ram, whereby driving force and tensioning force can be coincidentally imparted to said plurality of conveyors.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |