US4240620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gripping arrangement
Assignee: TUENKERS GmbH
•
Filing: 1979-03-19
•
Granted: 1980-12-23
•
Expires: 1999-03-19
Abstract
Abstract A gripping arrangement includes a gripping member operatively connected with a differential both-side acted piston movable in a pneumatic or hydraulic cylinder. The piston stroke includes a first step and a second step. The pressure acted upon the piston to move the same into the respective gripping position is partially counteracted at the first step so as to eliminate an undesirably fast movement of the gripping member during at least initial portion of the stroke. The remaining portion of the stroke the piston moves under full pressure exerted by the pressure medium supplied in the cylinder without any counteracting effect.
Inventors
- 👤 Josef-Gerhard Tunkers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:57
CPC Classifications
B; B25; B25B; B25B5/00; B25B5/06; B25B5/12; B25B5/122
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
174 words
A gripping arrangement comprising gripping means movable through a predetermined stroke between a rest and a gripping position; a cylinder including a double acting piston operatively connected to said gripping means for urging the latter from said rest to said gripping position with a predetermined pressure, said piston subdividing the interior of said cylinder into a lower cylindrical chamber and an upper annular chamber; first communication means between said cylindrical and said annular chambers for partially counteracting said pressure during a predetermined initial portion of said stroke for permitting said gripping means to move under said pressure only during the remaining portion of its stroke toward said gripping position, first connecting means for alternately supplying and withdrawing pressure medium from said cylindrical chamber; second connecting means for alternately supplying and withdrawing pressure medium from said annular chamber; and second communication means arranged between said annular chamber and said second connecting means, said second communication means being closed by said piston when said piston reaches the end portion of said stroke towards the gripping position.
Claim 2
Dependent Claim
174 words
A gripping arrangement comprising gripping means movable through a predetermined stroke between a rest and a gripping position; a cylinder including a double acting piston operatively connected to said gripping means for urging the latter from said rest to said gripping position with a predetermined pressure, said piston subdividing the interior of said cylinder into a lower cylindrical chamber and an upper annular chamber; first communication means between said cylindrical and said annular chambers for partially counteracting said pressure during a predetermined initial portion of said stroke for permitting said gripping means to move under said pressure only during the remaining portion of its stroke toward said gripping position, first connecting means for alternately supplying and withdrawing pressure medium from said cylindrical chamber; second connecting means for alternately supplying and withdrawing pressure medium from said annular chamber; and second communication means arranged between said annular chamber and said second connecting means, said second communication means being closed by said piston when said piston reaches the end portion of said stroke towards the gripping position.
Claim 3
Dependent Claim
104 words
An arrangement as defined in claim 1, wherein said first communication means further comprise a check valve operative for permitting said pressure medium flow from said cylindrical chamber into said annular chamber and preventing said pressure medium flow in the opposite direction so that when said pressure medium is supplied into said cylindrical chamber thus exerting said predetermined pressure on said piston to thereby move the same correspondingly toward said gripping position, said pressure medium enters said annular chamber through said first communication means to thereby exert a counteracting pressure on said piston in the opposite direction to thereby partially counteracting said predetermined pressure.
Claim 4
Dependent Claim
58 words
An arrangement as defined in claim 2, wherein said piston has a lower surface faced said cylindrical chamber and an upper annular surface surrounding the piston rod and facing said annular chamber, said annular surface having substantially smaller cross-sectional dimension than said lower surface, to thereby ensure that said counteracting pressure is substantially smaller than said predetermined pressure.
Claim 5
Dependent Claim
44 words
An arrangement as defined in claim 3, wherein said first communication means include a throughgoing passage provided on said piston having one end open into said cylindrical chamber and another end open into said annular chamber when said piston is in said rest position.
Claim 6
Dependent Claim
19 words
An arrangement as defined in claim 4, wherein said throughgoing passage extends at least partially through said piston rod.
Claim 7
Dependent Claim
36 words
An arrangement as defined in claim 4, wherein said first communicating means include a conduit located outside said cylindrical and having one end open into said cylindrical chamber and another end open into said annular chamber.
Claim 8
Dependent Claim
39 words
An arrangement as defined in claim 4, wherein said first communicating means include a bore provided in the wall of said cylinder and having one end open into said cylindrical chamber and another end open into said annular chamber.
Claim 9
Dependent Claim
27 words
An arrangement as defined in claim 3, wherein said second connecting means include a first channel and said second communication means are connected to said first channel.
Claim 10
Dependent Claim
40 words
An arrangement as defined in claim 8, wherein said second communication means include a first passage in the wall of the cylinder which is operative for at least temporarily connecting said first channel with the interior of said annular chamber.
Claim 11
Dependent Claim
54 words
An arrangement as defined in claim 9, wherein said first passage is an annular longitudinal gap defined between the piston rod and the wall of said cylinder, said longitudinal gap having one end open into said annular chamber and another open end longitudinally spaced from said one end and communicating with said first channel.
Claim 12
Dependent Claim
45 words
An arrangement as defined in claim 10, wherein said first passage is a first bore provided in the wall of said cylinder and having one end open into said annular chamber and another end spaced from said first end and open into said first channel.
Claim 13
Dependent Claim
57 words
An arrangement as defined in claim 9; and further comprising means for closing said first passage when said piston uninterruptedly moves through said remaining portion of its stroke towards said gripping position, so that when said first passage is closed said first channel communicates with the interior of the annular chamber only through said permanently open bore.
Claim 14
Dependent Claim
62 words
An arrangement as defined in claim 12, wherein said communicating means are so adapted as to become closed when said first passage is closed so as to prevent any pressure medium flow from said cylindrical chamber into said annular chamber thus eliminating said counteracting pressure on said piston to permit the same uninterruptedly moves towards said gripping position under said predetermined pressure.
References Cited (Backward Citations)
US3735632A
Cited
DE2222686A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |