US4573568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain for a flight conveyor
Assignee: Buehler AG
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Filing: 1983-06-22
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Granted: 1986-03-04
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Expires: 2003-06-22
Abstract
Abstract A chain for a trough conveyor having individual chain links (2, 3) connected with each other by hinge bolts (1). Flight attachment members (5, 5a) connected with each other by at least one cross piece (10, 10a) are provided on both sides of said chain links (2, 3). Two bearing blocks (7, 7a) are provided, each with a bore (8) for receiving the hinge bolt (1). The cross piece (10, 10a) rests on the trough by way of a rest surface (9, 9a). At least one support surface (12) disposed in relation to the cross piece (10, 10a) in the direction of the chain serves for preventing the tipping of the flight attachment arms when under the action of operating forces (11).
Inventors
- 👤 Wilhelm Maag
- 👤 Paul Straub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:18
CPC Classifications
B; B65; B65G; B65G19/00; B65G19/04; B65G19/06; B65G19/08; B65G19/18; B65G19/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A removable flight attachment for a flight conveyor for feeding a load of material through a trough of predetermined width, a series of chain links each interconnected by a hinge bolt, said links having a stem and a wider body portion, said body portion having two sidewalls and an opening for receiving the next succeeding stem with said body portion and succeeding stem being joined by said hinge bolt passing through aligned apertures therein, said removable attachment comprising: a frame having an opening sized to receive said wider body portion and a front face having an opening sized to receive said stem but not said wider body portion, including a rest surface at least on the bottom portion of said frame in slideable engagement with said trough, bearing walls attached to said frame and located on each side of said body portion, said bearing walls including apertures aligned to receive said hinge bolt, a pair of lateral arms extending outwardly from said frame, and a pair of cross pieces bridging said bearing walls to form together the enclosed frame.
Claim 2
Dependent Claim
179 words
A removable flight attachment for a flight conveyor for feeding a load of material through a trough of predetermined width, a series of chain links each interconnected by a hinge bolt, said links having a stem and a wider body portion, said body portion having two sidewalls and an opening for receiving the next succeeding stem with said body portion and succeeding stem being joined by said hinge bolt passing through aligned apertures therein, said removable attachment comprising: a frame having an opening sized to receive said wider body portion and a front face having an opening sized to receive said stem but not said wider body portion, including a rest surface at least on the bottom portion of said frame in slideable engagement with said trough, bearing walls attached to said frame and located on each side of said body portion, said bearing walls including apertures aligned to receive said hinge bolt, a pair of lateral arms extending outwardly from said frame, and a pair of cross pieces bridging said bearing walls to form together the enclosed frame.
Claim 3
Dependent Claim
39 words
An attachment according to claim 1 wherein said bearing wall apertures are located at least as high as the center of gravity of the attachment when fully loaded with material, to reduce frictional forces acting on said rest surface.
Claim 4
Dependent Claim
25 words
An attachment according to claim 1 further including at least one rib extending from said bearing walls to the adjacent arm for reinforcing said arms.
Claim 5
Dependent Claim
24 words
An attachment according to claim 3 wherein said at least one rib extends from said bearing walls between one-third and one-half of its length.
Claim 6
Dependent Claim
35 words
An attachment according to claim 4 wherein said at least one rib is formed of a generally triangular member with its hypotenuse connecting points on said walls and arm distant from their point of intersection.
Claim 7
Dependent Claim
22 words
An attachment according to claim 5 wherein the plastic contains MoS 2 as a lubricant and a graphite as an electrostatic conductor.
References Cited (Backward Citations)
CA678982A
Cited
US231186A
Cited
US544434A
Cited
DE838123C
Cited
DE16855C
Cited
DE551088C
Cited
US2570583A
Cited
DE848029C
Cited
US2779454A
Cited
US2944657A
Cited
US3147850A
Cited
US3130708A
Cited
US3091325A
Cited
DE2716094A1
Cited
US4441605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |