US4526088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-operated actuating device
Assignee: Stabilus GmbH
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Filing: 1982-11-26
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Granted: 1985-07-02
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Expires: 2002-11-26
Abstract
Abstract A fluid-operated actuating device of the type including an actuating cylinder member, an axially movable actuating piston rod member, and actuating fluid connection means for introducing actuating fluid to and removing actuating fluid from the actuating cylinder member so as to adjust the relative axial position of the actuating cylinder and piston members and including structure for damping the movement of the piston rod member with respect to the cylinder member.
Inventors
- 👤 Hermann Reuschenbach
- 👤 Egon Sentinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:25
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B11/076; F15B2211/00; F15B2211/20; F15B2211/21; F15B2211/216; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/415; F15B2211/41527; F15B2211/60; F15B2211/625; F15B2211/70; F15B2211/755; F15B2211/80; F15B2211/885; F15B2211/8855
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
416 words
In a fluid-operating actuating device comprising an actuating cylinder member having an axis and two ends and defining therewith an actuating cavity; an axially movable actuating piston rod member extending in sealing relation through at least one of said two ends of the actuating cylinder member; an actuating piston carried by said actuating piston rod member and defining two actuating chambers within said actuating cavity; actuating fluid connection means for introducing actuating fluid to and removing actuating fluid from said actuating chambers; and damping means for damping axial movement of said actuating piston rod member relative to said actuating cylinder member, said damping means comprising: (1) said actuating piston rod member comprising a cylindrical member having an axis and two ends and defining a damping cavity therewithin; (2) a damping piston unit axially movable within said damping cavity in sealing engagement with the interior surface of said actuating piston rod member and defining two damping chambers within said damping cavity; (3) a damping piston rod member connected to said damping piston unit, said damping piston rod member extending in sealing relation through at least one end of said actuating piston rod member and being connected to said actuating cylinder member; (4) a self-contained damping fluid sealed within said damping cavity; (5) flow passage means connecting said two damping chambers and extending through said damping piston unit; (6) damping valve means associated with said flow passage means for varying the flow cross-section of said flow passage means; (7) valve operating means associated with said damping valve means for controlling said damping valve means from outside said damping cavity, said valve operating means comprising rod means passing through an axial bore in said damping piston rod member, said rod means adjacent its end remote from said damping valve means being operatively connected to adjusting means provided at said at least one end of said actuating piston rod member; the improvement comprising: (a) the flow cross-section defined by said damping valve means being variable by axial movement of said rod means; (b) said rod means being provided with an engagement face at said remote end thereof; and (c) biasing means being provided for urging said engagement face towards engagement with a continuously adjustable counterengagement face of said adjusting means, said counterengagement face being defined by a counterengagement member movable with respect to said damping piston rod member by a fluidic drive means, the range of movement of said counterengagement member being defined by at least one adjustable abutment member.
Claim 2
Dependent Claim
416 words
In a fluid-operating actuating device comprising an actuating cylinder member having an axis and two ends and defining therewith an actuating cavity; an axially movable actuating piston rod member extending in sealing relation through at least one of said two ends of the actuating cylinder member; an actuating piston carried by said actuating piston rod member and defining two actuating chambers within said actuating cavity; actuating fluid connection means for introducing actuating fluid to and removing actuating fluid from said actuating chambers; and damping means for damping axial movement of said actuating piston rod member relative to said actuating cylinder member, said damping means comprising: (1) said actuating piston rod member comprising a cylindrical member having an axis and two ends and defining a damping cavity therewithin; (2) a damping piston unit axially movable within said damping cavity in sealing engagement with the interior surface of said actuating piston rod member and defining two damping chambers within said damping cavity; (3) a damping piston rod member connected to said damping piston unit, said damping piston rod member extending in sealing relation through at least one end of said actuating piston rod member and being connected to said actuating cylinder member; (4) a self-contained damping fluid sealed within said damping cavity; (5) flow passage means connecting said two damping chambers and extending through said damping piston unit; (6) damping valve means associated with said flow passage means for varying the flow cross-section of said flow passage means; (7) valve operating means associated with said damping valve means for controlling said damping valve means from outside said damping cavity, said valve operating means comprising rod means passing through an axial bore in said damping piston rod member, said rod means adjacent its end remote from said damping valve means being operatively connected to adjusting means provided at said at least one end of said actuating piston rod member; the improvement comprising: (a) the flow cross-section defined by said damping valve means being variable by axial movement of said rod means; (b) said rod means being provided with an engagement face at said remote end thereof; and (c) biasing means being provided for urging said engagement face towards engagement with a continuously adjustable counterengagement face of said adjusting means, said counterengagement face being defined by a counterengagement member movable with respect to said damping piston rod member by a fluidic drive means, the range of movement of said counterengagement member being defined by at least one adjustable abutment member.
Claim 3
Dependent Claim
51 words
The fluid-operated actuating device of claim 1, wherein said counterengagement face is defined by a cam face of said counterengagement member, said counterengagement member being adjustable along a direction substantially transverse to the axis of said actuating piston rod member, said cam face being inclined with respect to said transverse direction.
Claim 4
Dependent Claim
37 words
The fluid-operated actuating device of claim 1, wherein said counterengagement member is subject to the action of at least one resilient means and is movable by said fluidic drive means against the action of said resilient means.
Claim 5
Dependent Claim
54 words
The fluid-operated actuating device of claim 3, wherein said counterengagement member is biased by said resilient means towards a first position and is movable into a second position and a third position by said fluidic drive means, at least two of said first, second and third positions being defined by respective adjustable abutment members.
Claim 6
Dependent Claim
239 words
The fluid-operated actuating device of claim 4, wherein the improvement further comprises first and second drive piston members provided in a common cylinder having a first end adjacent said first drive piston member and a second end adjacent said second drive piston member; a first drive fluid port being provided in said drive cylinder adjacent a first end of said drive cylinder for admitting fluid to act on a first end of said first drive piston member; a second drive fluid port being provided in said drive cylinder between said first and said second drive piston members for admitting drive fluid acting on the second end of said first drive piston member and on a first end of said second drive piston member adjacent said first drive piston member; resilient means being provided for biasing said second drive piston member towards said first drive piston member; a first adjustable abutment member being provided for defining the maximum spacing of said first drive piston member from said first end of said cylinder; a second adjustable abutment member being provided for defining the minimum spacing of said second drive piston member from said second end of said cylinder; and piston abutment means being provided on said first drive piston member and said second drive piston member adjacent their second and first ends, respectively, for coaction with said first and second adjustable abutment members to define said maximum and minimum spacings, respectively.
Claim 7
Dependent Claim
19 words
The fluid-operated actuating device of claim 5, wherein said counterengagement face is provided on said second drive piston member.
Claim 8
Dependent Claim
68 words
The fluid-operated actuating device of claim 6, wherein a recess is defined within said first drive piston member, and said first adjustable abutment member enters through an aperture of said first drive piston member into said recess, cooperating shoulder faces being provided on a portion of said first adjustable abutment member housed within said recess and on a portion of said first drive piston member surrounding said aperture.
Claim 9
Dependent Claim
67 words
The fluid-operated actuating device of claim 1, wherein said damping piston rod member extends through only one end of said actuating piston rod member, and wherein compressible-volume compensating means are associated with said damping cavity for compensating for the varying volume of said damping piston rod member within said damping cavity during axial movement of said damping piston rod member relative to said actuating piston rod member.
Claim 10
Dependent Claim
21 words
The fluid-operated actuating device of claim 8 wherein said damping cavity contains a pressurized gas which comprises said compressible-volume compensating means.
Claim 11
Dependent Claim
79 words
The fluid-operated actuating device of claim 8, wherein said damping chambers are filled with a liquid, and said compressible-volume compensating means comprises movable separating means in sealing engagement with the interior surface of said actuating piston rod member for defining an end wall of at least one of said damping chambers, and further comprising resilient means located on that side of said separating means which is remote from said liquid tending to urge said separating means towards said liquid.
Claim 12
Dependent Claim
15 words
The fluid-operated actuating device of claim 10, wherein said resilient means comprises mechanical spring means.
Claim 13
Dependent Claim
25 words
The fluid-operated actuating device of claim 8, wherein said biasing means are defined by a superatmospheric pressure of said damping fluid within said damping cavity.
Claim 14
Dependent Claim
42 words
The fluid-operated actuating device of claim 1, wherein said adjusting means are provided in an end portion defining the end wall at the other end of said actuating cylinder member, said damping piston rod member being axially fastened to said end portion.
Claim 15
Dependent Claim
25 words
The fluid-operated actuating device of claim 1, wherein said damping valve means is biased towards a position of maximum flow cross-section by said biasing means.
Claim 16
Dependent Claim
22 words
The fluid-operated actuating device of claim 1, wherein said at least one adjustable abutment member is defined by an adjustable abutment screw.
Claim 17
Dependent Claim
32 words
The fluid-operated actuating device of claim 1, wherein said counterengagement member comprises a drive piston member (455) of a cylinder-piston drive unit, said drive unit being provided with drive fluid connection means.
Claim 18
Dependent Claim
25 words
The fluid-operated actuating device of claim 1, wherein said damping valve means are biased towards a position of minimum flow cross-section by said biasing means.
Claim 19
Dependent Claim
22 words
A fluid-operated actuating device of claim 17, wherein said damping valve means are biased towards a closed position by said biasing means.
Claim 20
Dependent Claim
47 words
The fluid-operated actuating device of claim 1, wherein said counterengagement face is defined by an axially directed terminal face of a counterengagement member which is adjustable with respect to said damping piston rod member in a direction parallel to said axis of said actuating piston rod member.
Claim 21
Dependent Claim
200 words
The fluid-actuating device of claim 1 wherein the improvement further comprises: (a) compressible-volume compensating means being associated with said damping cavity for compensating for the varying volume of said damping piston rod member within said damping cavity during axial movement of said damping piston rod member relative to said actuating piston rod member, said damping piston rod member extending through only one end of said actuating piston rod member, said compressible volume compensating means comprising (i) movable separating means in sealing engagement with the interior surface of said actuating piston rod member for defining an end wall of at least one of said damping chambers, said damping chambers being filled with a liquid, and (ii) resilient means located on that side of said separating means which is remote from said liquid and tending to urge said separating means toward said liquid; and (b) a dividing wall within said damping cavity axially between said movable separating means and said damping piston unit, said dividing wall being bridged by throttled passage means offering larger flow resistance for said damping fluid through said dividing wall toward said movable separating means, and smaller flow resistance through said dividing wall toward said damping piston unit.
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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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |