Patent US3718250A successfully refreshed from Google Patents.
US3718250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant tensioning device for the chains of conveyors
Assignee: UNITED IND SYNDICATE
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Filing: 1971-04-29
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Granted: 1973-02-27
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Expires: 1991-04-29
Abstract
Abstract A device is disclosed for tensioning a pair of vertically spaced conveyor chains. The device has upper and lower pairs of laterally spaced guide rods and sprocket shafts, one for each pair of guide rods and having transverse bores through which they extend. A chain supporting sprocket is rotatably mounted on each shaft. Each shaft also has a block mounted thereon between the guide rods. Each device also includes a fluid pressure operated unit of the piston-cylinder type with its stem pivotally connected to the middle of a pressure applying member whose extremities are in engagement with the block. With a predetermined fluid pressure delivered to the unit, either one or both of the sprockets is urged in a chain-tightening direction.
Inventors
- 👤 D Bosworth
- 👤 J Fournier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:57
CPC Classifications
B; B65; B65G; B65G23/00; B65G23/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
Tensioning means for conveyor systems of the type having independent upper and lower conveyor chains each separately supported by sprockets at their ends, said means comprising a device for one of said ends and including supporting structure, a pair of parallel stub shafts, chain supporting sprockets rotatably mounted on said shafts and means attachIng each stub shaft to said structure to move relative thereto in chaintightening or chain-releasing directions, reciprocable pressure operated means and a pressure applying member to the intermediate part of which said pressure operated means is pivotally connected with its pivot axis parallel with the axes of the stub shafts and whose ends are each in pressure-applying engagement with a respective one of said shafts.
Claim 2
Dependent Claim
118 words
Tensioning means for conveyor systems of the type having independent upper and lower conveyor chains each separately supported by sprockets at their ends, said means comprising a device for one of said ends and including supporting structure, a pair of parallel stub shafts, chain supporting sprockets rotatably mounted on said shafts and means attachIng each stub shaft to said structure to move relative thereto in chaintightening or chain-releasing directions, reciprocable pressure operated means and a pressure applying member to the intermediate part of which said pressure operated means is pivotally connected with its pivot axis parallel with the axes of the stub shafts and whose ends are each in pressure-applying engagement with a respective one of said shafts.
Claim 3
Dependent Claim
38 words
The tensioning means of claim 1 in which shaft attaching means comprise laterally spaced pairs of guide rods, the pairs of guide rods being vertically spaced, and the stub shafts are connected to respective ones of said pairs.
Claim 4
Dependent Claim
24 words
The tensioning means of claim 2 in which the guide rods are slidably supported by the front and rear walls of the supporting structure.
Claim 5
Dependent Claim
23 words
The tensioning device of claim 1 in which each stub shaft has a pair of transverse bores through which its guide rods extend.
Claim 6
Dependent Claim
17 words
The tensioning device of claim 4 in which each stub shaft is fixed to its guide rods.
Claim 7
Dependent Claim
23 words
The tensioning device of claim 3 in which each stub shaft includes a fixed block engaged by an extremity of the pressure-applying member.
Claim 8
Dependent Claim
37 words
The tensioning means of claim 5 in which the blocks have vertically disposed faces paralleling the stub shafts, and each extremity of the pressure-applying member includes a pin in engagement with an appropriate one of said faces.
Claim 9
Dependent Claim
68 words
The tensioning means of claim 6 in which the blocks have vertically disposed faces paralleling the stub shafts, the pressure-applying member consists of two side parts straddling the sides of the blocks, and clevis pins interconnecting the extremities of the side parts, one of each block and in engagement with the vertically disposed face thereof, said blocks holding the stem of the fluid pressure operated means from turning.
Claim 10
Dependent Claim
34 words
The tensioning device of claim 1 in which the supporting structure comprises an open-sided, rectangular frame and a base in the form of a bar to which the bottom of the frame is welded.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |