Patent US4993540A successfully refreshed from Google Patents.
US4993540A
Expired / Lapsed
US
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Low back pressure conveyor
Assignee: Conway Exploitatie en Beheer BV
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Filing: 1989-12-21
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Granted: 1991-02-19
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Expires: 2009-12-21
Abstract
Abstract A conveyor having a carrying surface formed by rollers (12, 13) which are freely rotatably mounted on bars (5) extending transversely between the links (3, 4) of side chains (1, 2). The chain links (3, 4) are slidable one into another to enable the inside-bend chain (2) to temporarily contract when moving through a bend. The rollers (12) of a plurality thereof are mounted next to each other on each roller-carrying bar (5).
Inventors
- 👤 Pieter van Capelleveen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:15
CPC Classifications
B; B65; B65G; B65G17/00; B65G17/06; B65G17/063; B65G17/24; B65G2201/00; B65G2201/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
A low back pressure chain conveyor comprising: two endless side chains each constructed of a series of interengaging links, longitudinally adjacent links in each side chain lying in planes which are substantially perpendicular to each other, said links allowing a temporary shortening of one side chain relative to the other side chain by temporarily sliding one into another in series along the respective side chain for traversing lateral bends; through bars extending transversely between the chains, each said through bar having opposite ends connected to corresponding links of respective ones of said side chains; and a plurality of rollers mounted on each of alternate ones of said through bars for free rotation relative to the respective bar and, on each bar, relative to one another, so that as the conveyor executes a lateral bend having an inside and an outside, at least one said roller on each bar and located nearer said outside of said lateral bend can rotate faster than at least one other said roller on each bar and located nearer said inside of said lateral bend.
Claim 2
Dependent Claim
179 words
A low back pressure chain conveyor comprising: two endless side chains each constructed of a series of interengaging links, longitudinally adjacent links in each side chain lying in planes which are substantially perpendicular to each other, said links allowing a temporary shortening of one side chain relative to the other side chain by temporarily sliding one into another in series along the respective side chain for traversing lateral bends; through bars extending transversely between the chains, each said through bar having opposite ends connected to corresponding links of respective ones of said side chains; and a plurality of rollers mounted on each of alternate ones of said through bars for free rotation relative to the respective bar and, on each bar, relative to one another, so that as the conveyor executes a lateral bend having an inside and an outside, at least one said roller on each bar and located nearer said outside of said lateral bend can rotate faster than at least one other said roller on each bar and located nearer said inside of said lateral bend.
Claim 3
Dependent Claim
38 words
A chain conveyor as in claim 1, wherein: at least some of the rollers are constituted by roller subassemblies each formed of a plurality of wheel portions interconnected by portions of lesser diameter than the wheel portions thereof.
Claim 4
Dependent Claim
28 words
A chain conveyor as in claim 1, wherein: at least some of the rollers are discrete wheels which are separate members from adjacent rollers on the same bar.
Claim 5
Dependent Claim
36 words
A chain conveyor as in claim 1, wherein: at least some of the rollers are each radially split into two connectable portions so that they can be mounted on a previously constructed chain and bar assembly.
Claim 6
Dependent Claim
36 words
A chain conveyor as in claim 4, wherein: the two connectable portions of each radially split roller are provided with complementary snap-together fastener means for assembling and mounting the radially split rollers on the respective bars.
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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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |