US3592131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cylinder apparatus
Assignee: Allied Products Corp
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Filing: 1969-06-11
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Granted: 1971-07-13
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Expires: 1989-06-11
Abstract
Abstract A hydraulic cylinder apparatus for a hydraulic press effectively provides in itself the hydraulically movable platen of the press. A hollow hydraulic cylinder body which is open at one end and closed at the other has a cylinder of large diameter at the open end and a cylinder of small diameter at the closed end communicating with the cylinder of large diameter substantially midway between the ends of the cylinder body. A piston body is longitudinally movably received in the cylinder body and it has intermediate its ends a piston of large diameter in the large diameter cylinder, a piston extension of small diameter in the small diameter cylinder and a ram extension of intermediate diameter extending through the open end of the cylinder body and effectively providing the hydraulically movable platen of the hydraulic press. Hydraulic packing is carried by the piston of large diameter and engages the cylinder of large diameter for hydraulically sealing the piston body in the cylinder body. Guide means is provided between the cylinder of small diameter and the piston extension for guiding longitudinal movement of this end of the piston body, and guide means is provided between the cylinder of large diameter and the ram extension for guiding longitudinal movement of this end of the piston body.
Inventors
- 👤 Tsuruo Otsuka
- 👤 Eugene E Grankowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
B; B30; B30B; B30B1/00; B30B1/32; B30B15/00; B30B15/04; B30B15/041
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
217 words
A hydraulic cylinder apparatus for a hydraulic press which also effectively provides the hydraulically movable platen of the press comprising, a hollow hydraulic cylinder body open at one end and closed at the other end and having a cylinder of large diameter at the open end and a cylinder of small diameter at the closed end communicating with the cylinder of large diameter substantially midway between the ends of the cylinder body, a piston body longitudinally movably received in the cylinder body and having intermediate its ends a piston of large diameter in the large diameter cylinder, a piston extension of small diameter extending toward the closed end of the cylinder body in the small diameter cylinder, and a ram extension of intermediate diameter extending through the open end of the cylinder body and effectively providing the hydraulically movable platen of the hydraulic press, hydraulic packing carried by the piston of large diameter and engaging the cylinder of large diameter for hydraulically sealing the piston body in the cylinder body, guide means between the cylinder of small diameter and the piston extension for guiding longitudinal movement of this end of the piston body, and guide means between the cylinder of large diameter and the ram extension for guiding longitudinal movement of this end of the piston body.
Claim 2
Dependent Claim
217 words
A hydraulic cylinder apparatus for a hydraulic press which also effectively provides the hydraulically movable platen of the press comprising, a hollow hydraulic cylinder body open at one end and closed at the other end and having a cylinder of large diameter at the open end and a cylinder of small diameter at the closed end communicating with the cylinder of large diameter substantially midway between the ends of the cylinder body, a piston body longitudinally movably received in the cylinder body and having intermediate its ends a piston of large diameter in the large diameter cylinder, a piston extension of small diameter extending toward the closed end of the cylinder body in the small diameter cylinder, and a ram extension of intermediate diameter extending through the open end of the cylinder body and effectively providing the hydraulically movable platen of the hydraulic press, hydraulic packing carried by the piston of large diameter and engaging the cylinder of large diameter for hydraulically sealing the piston body in the cylinder body, guide means between the cylinder of small diameter and the piston extension for guiding longitudinal movement of this end of the piston body, and guide means between the cylinder of large diameter and the ram extension for guiding longitudinal movement of this end of the piston body.
Claim 3
Dependent Claim
43 words
The hydraulic cylinder apparatus as defined in claim 1 including a keyway longitudinally arranged in the piston body and a key carried by the cylinder body engaging in said keyway to prevent rotation of the piston body with respect tO the cylinder body.
Claim 4
Dependent Claim
40 words
The hydraulic cylinder apparatus as defined in claim 1 wherein at least one of said guide means includes a plurality of circumferentially spaced rollers radially adjustably carried by the cylinder body and engaging the associated extension of the piston body.
Claim 5
Dependent Claim
52 words
The hydraulic cylinder apparatus as defined in claim 1 wherein said guide means between the cylinder of large diameter and the ram extension includes a plurality of circumferentially spaced rollers radially adjustably carried by the cylinder body between the cylinder of large diameter and the ram extension and engaging the ram extension.
Claim 6
Dependent Claim
102 words
A hydraulic cylinder apparatus as defined in claim 4 including a shouldered bushing on the piston of large diameter on one side of the hydraulic packing with the shoulder thereof engaging a shoulder on the piston, a shouldered bushing on the piston of large diameter on the other side of the hydraulic packing with the shoulder thereof facing the ram extension, and a retainer ring about the ram extension secured to the piston of large diameter and engaging the shoulder on the last mentioned shouldered bushing for retaining the bushings and the hydraulic packing in place on the piston of large diameter.
Claim 7
Dependent Claim
38 words
A hydraulic cylinder apparatus as defined in claim 4 wherein said guide means between the cylinder of small diameter and the piston extension includes a bushing carried by the piston extension and engaging the cylinder of small diameter.
Claim 8
Dependent Claim
113 words
The hydraulic cylinder apparatus as defined in claim 1 wherein said guide means between the cylinder of large diameter and the ram extension includes a plurality of circumferentially spaced brackets carried by the cylinder body and having cam members extending into the cylinder of large diameter, a plurality of roller supports having cam members extending into the cylinder and engaging the cam members of the brackets, means for adjustably positioning the roller supports on the brackets to cause the cam members to adjustably radially position the roller supports, and a plurality of rollers carried by the roller supports between the cylinder of large diameter and the ram extension and engaging the ram extension.
Claim 9
Dependent Claim
38 words
A hydraulic cylinder apparatus as defined in claim 7 wherein said guide means between the cylinder of small diameter and the piston extension includes a bushing carried by the piston extension and engaging the cylinder of small diameter.
Claim 10
Dependent Claim
102 words
A hydraulic cylinder apparatus as defined in claim 7 including a shouldered bushing on the piston of large diameter on one side of the hydraulic packing with the shoulder thereof engaging a shoulder on the piston, a shouldered bushing on the piston of large diameter on the other side of the hydraulic packing with the shoulder thereof facing the ram extension, and a retainer ring about the ram extension secured to the piston of large diameter and engaging the shoulder on the last mentioned shouldered bushing for retaining the bushings and the hydraulic packing in place on the piston of large diameter.
Claim 11
Dependent Claim
102 words
A hydraulic cylinder apparatus as defined in claim 1 including a shouldered bushing on the piston of large diameter on one side of the hydraulic packing with the shoulder thereof engaging a shoulder on the piston, a shouldered bushing on the piston of large diameter on the other side of the hydraulic packing with the shoulder thereof facing the ram extension, and a retainer ring about the ram extension secured to the piston of large diameter and engaging the shoulder on the last mentioned shouldered bushing for retaining the bushings and the hydraulic packing in place on the piston of large diameter.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |