US3918352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for feeding a pressure medium to a rotating double acting pressure cylinder for actuating clamping tools
Assignee: Forkardt Deutschland GmbH
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Filing: 1974-02-15
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Granted: 1975-11-11
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Expires: 1994-02-15
Abstract
Abstract A device for feeding a pressure medium to a rotating double acting pressure medium operable cylinder piston assembly for actuating clamping tools, especially chucks on machine tools, which is provided with a rotatable member, e. g. a housing or a chuck, and with a feeding ring mounted on the rotatable member and held stationary relative thereto. The feeding ring has an Ishaped cross section with a double groove on both sides of the web with annular diaphragms slightly axially displaceable in the double grooves for cooperation with the respective oppositely located annular surfaces of the rotatable member while an adjacent annular groove in the rotatable member is in communication with one of the piston sides of the piston to be controlled.
Inventors
- 👤 Kurt Reich
- 👤 Hans Blattry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:47
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/16; B23B31/16233; B23B31/16254; Y; Y10; Y10T; Y10T279/00; Y10T279/12; Y10T279/1274; Y10T279/1291
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
214 words
A device for feeding fluid pressure medium to opposite sides of a piston in a rotatable double-acting cylinder piston assembly, comprising a rotatable housing member having two annular, spaced radial surfaces, each with a circumferential groove therein, a stationary feeding ring having double-T-form cross section mounted on said rotatable housing member between said radial surfaces with annular radial side walls opposed to and facing said radial surfaces on said housing member, each said side wall having a circumferential channel opening laterally toward the opposed radial surface, an annular diaphragm disk in each channel having passage means therethrough opening toward the circumferential groove in the opposite radial surface, first communicating passages connecting to the grooves in said radial surfaces to convey fluid pressure medium selectively to opposite sides of said cylinder piston assembly to actuate said piston between two end positions, inlet connections on said feeding ring to supply fluid pressure medium selectively to actuate said piston and second communicating passages from each of said inlet connections to a corresponding channel in said feeding ring to supply said medium through said passage means in the diaphragm disk in said channel to the groove in the opposed radial surface and to press said diaphragm disk against said radial surface to seal said passage means and groove.
Claim 2
Independent Claim
214 words
A device for feeding fluid pressure medium to opposite sides of a piston in a rotatable double-acting cylinder piston assembly, comprising a rotatable housing member having two annular, spaced radial surfaces, each with a circumferential groove therein, a stationary feeding ring having double-T-form cross section mounted on said rotatable housing member between said radial surfaces with annular radial side walls opposed to and facing said radial surfaces on said housing member, each said side wall having a circumferential channel opening laterally toward the opposed radial surface, an annular diaphragm disk in each channel having passage means therethrough opening toward the circumferential groove in the opposite radial surface, first communicating passages connecting to the grooves in said radial surfaces to convey fluid pressure medium selectively to opposite sides of said cylinder piston assembly to actuate said piston between two end positions, inlet connections on said feeding ring to supply fluid pressure medium selectively to actuate said piston and second communicating passages from each of said inlet connections to a corresponding channel in said feeding ring to supply said medium through said passage means in the diaphragm disk in said channel to the groove in the opposed radial surface and to press said diaphragm disk against said radial surface to seal said passage means and groove.
Claim 3
Dependent Claim
55 words
A device according to claim 1, in which each of said channels is formed with undercut grooves in said side walls at the radially inner and outer sides of each channel to form radial flanges overlying the channel to retain said diaphragm in said channel, said fluid pressure medium pressing said diaphragm against said flanges.
Claim 4
Dependent Claim
35 words
A device according to claim 1, in which each of said channels has a circumferential groove in the bottom wall of the channel which connects through the passage means to one of the inlet connections.
Claim 5
Dependent Claim
35 words
A device in combination according to claim 1, in which each undercut groove has a trapezoidal form in cross section and each diaphragm is pressed into sealing engagement against the outer edges of said grooves.
Claim 6
Independent Claim
316 words
A device for feeding fluid pressure medium to opposite sides of a piston in a rotatable double-acting cylinder piston assembly, comprising a rotatable housing member having two separable parts connected together, each of saId parts having an annular, radial surface spaced from and facing the radial surface of the other part, each of said radial surfaces having an annular boss projecting toward the opposite surface and formed with a circumferential groove therein, a stationary feeding ring having double-T-form mounted on said rotatable housing member between said radial surfaces with annular radial side walls opposed to and facing said radial surfaces on said housing member, each side wall having a circumferential channel opening laterally toward the opposed radial surface, each of said channels being formed with undercut grooves in said side walls at the radially inner and outer sides of each channel to form radial flanges overlying the channel, the boss on the opposed radial surface extending between the flanges on the opposite channel, an annular diaphragm disk in each channel having passage means therethrough opening toward the circumferential groove in the boss on the opposite radial surface, first communicating passages connecting to the grooves in the bosses on said radial surfaces to convey fluid pressure medium selectively to opposite sides of the piston of said cylinder piston assembly to actuate said piston between two end positions, inlet connections on said feeding ring to supply fluid pressure medium selectively to actuate said piston, and second communicating passages from each of said inlet connections to a corresponding channel in said feeding ring to supply fluid pressure medium through said passage means in the diaphragm in said channel to the groove in the boss in the opposed radial surface and to press said diaphragm against said boss and the flanges of said channel to seal said passage means on opposite sides of said groove and edges of said channel.
Claim 7
Independent Claim
316 words
A device for feeding fluid pressure medium to opposite sides of a piston in a rotatable double-acting cylinder piston assembly, comprising a rotatable housing member having two separable parts connected together, each of saId parts having an annular, radial surface spaced from and facing the radial surface of the other part, each of said radial surfaces having an annular boss projecting toward the opposite surface and formed with a circumferential groove therein, a stationary feeding ring having double-T-form mounted on said rotatable housing member between said radial surfaces with annular radial side walls opposed to and facing said radial surfaces on said housing member, each side wall having a circumferential channel opening laterally toward the opposed radial surface, each of said channels being formed with undercut grooves in said side walls at the radially inner and outer sides of each channel to form radial flanges overlying the channel, the boss on the opposed radial surface extending between the flanges on the opposite channel, an annular diaphragm disk in each channel having passage means therethrough opening toward the circumferential groove in the boss on the opposite radial surface, first communicating passages connecting to the grooves in the bosses on said radial surfaces to convey fluid pressure medium selectively to opposite sides of the piston of said cylinder piston assembly to actuate said piston between two end positions, inlet connections on said feeding ring to supply fluid pressure medium selectively to actuate said piston, and second communicating passages from each of said inlet connections to a corresponding channel in said feeding ring to supply fluid pressure medium through said passage means in the diaphragm in said channel to the groove in the boss in the opposed radial surface and to press said diaphragm against said boss and the flanges of said channel to seal said passage means on opposite sides of said groove and edges of said channel.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |