US3892437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Center hoisting device
Assignee: FINNLINES Ltd Oy
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Filing: 1974-08-02
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Granted: 1975-07-01
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Expires: 1994-08-02
Abstract
Abstract A center hoisting device for rolls and the like is disclosed which comprises a hoisting piece that can be fitted inside the center of a roll of paper or the like and which can be expanded so that its circumference presses against the wall of the roll center to create a frictional contact between the hoisting piece and the roll; the hoisting piece being a hydraulic cylinder hoisted by its piston rod, wherein the upper part of the peripheral wall of the cylinder has at least one aperture, and the peripheral wall is at least partly covered with a resilient material secured thereto in liquid tight relation to create at the periphery of the cylinder an expandable space which is in hydraulic communication with the cylinder through the aperture, so that the resilient material will be expanded upon contraction of the piston rod, by fluid supplied to said expandable space through the aperture, thereby to engage the wall of the roll center.
Inventors
- 👤 Pentti Vainamo Makinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:04
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/42; B66C1/44; B66C1/46
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
209 words
An improved center hoisting device for rolls and similar pieces having a hollow core member, said device comprising a hydraulic cylinder having first and second opposite ends and adapted to be inserted inside of the core of said roll and including a piston located within the cylinder for movement between two extreme positions, and a piston rod secured to said piston and extending through said first end of the cylinder; a resilient cover attached on the hydraulic cylinder and enclosing at least a portion of the exterior of the hydraulic cylinder facing the core member of the roll to define an expandable space between the cover and the exterior of said cylinder, said cylinder having an aperture formed therein adjacent said first end of the cylinder beyond the extreme positions of said piston for providing communication between said space and the inside of the cylinder whereby, application of a pulling force to said piston rod causing said piston to move towards said first end, fluid in said cylinder between said piston and said first end is urged through said aperture into said space to expand said space and said resilient cover thereby to engage said cover with said core member and allow said pulling force to lift said roll.
Claim 2
Dependent Claim
209 words
An improved center hoisting device for rolls and similar pieces having a hollow core member, said device comprising a hydraulic cylinder having first and second opposite ends and adapted to be inserted inside of the core of said roll and including a piston located within the cylinder for movement between two extreme positions, and a piston rod secured to said piston and extending through said first end of the cylinder; a resilient cover attached on the hydraulic cylinder and enclosing at least a portion of the exterior of the hydraulic cylinder facing the core member of the roll to define an expandable space between the cover and the exterior of said cylinder, said cylinder having an aperture formed therein adjacent said first end of the cylinder beyond the extreme positions of said piston for providing communication between said space and the inside of the cylinder whereby, application of a pulling force to said piston rod causing said piston to move towards said first end, fluid in said cylinder between said piston and said first end is urged through said aperture into said space to expand said space and said resilient cover thereby to engage said cover with said core member and allow said pulling force to lift said roll.
Claim 3
Dependent Claim
30 words
The improved center hoisting device of claim 1, further comprising a release spring located in said cylinder and operatively connected between the piston and the first end of the cylinder.
Claim 4
Dependent Claim
62 words
The improved center hoisting device of claim 1 further comprising a stop member attached to said piston rod adjacent the side of the piston facing said first end to limit movement of said piston towards said first end and define one of said extreme positions of the piston, thereby to prevent the piston from blocking the aperture during operation of the device.
Claim 5
Dependent Claim
30 words
The improved center hoisting device of claim 1, in which the resilient cover surrounds substantially the entire exterior of said cylinder and is secured to the ends of the cylinder.
References Cited (Backward Citations)
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US3052494A
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US3396980A
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US3367098A
Cited
US3462934A
Cited
US3605960A
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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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |