Patent US3882759A successfully refreshed from Google Patents.
US3882759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid actuated control device
Assignee: Deere and Co
•
Filing: 1974-01-17
•
Granted: 1975-05-13
•
Expires: 1994-01-17
Abstract
Abstract A device is described for the movement of a rod means into a plurality of positions along a linear path. It consists of an open-ended, longitudinally bored cylinder body containing a piston rod with a fixed piston and with a plurality of stops which limit the movement of two additional pistons slidable relative to the rod and in the bore. One of the additional pistons is limited in its travels by stop means in the bore and the other additional piston has the rod means operatively associated with it. Three fluid passage means have restrictors of a predetermined, fixed ratio of cross-sectional areas, and by selected release and pressurization of the fluid passage means according to a series of combinations in binary code, incremental stepping positions of the rod means are effected.
Inventors
- 👤 Charles William Formwalt
- 👤 John Lewis Frank
- 👤 Allen Paul Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:12
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/08; F15B11/12; F15B11/121; F15B11/125
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
244 words
A fluid actuated control device comprising: a cylinder body having a longitudinally extending bore provided therein and open to one end; a piston rod of a diameter less than the diameter of the bore positioned in the bore; a first stop means on the inner end of the rod; a second stop means on the rod between and spaced from the first stop means and the outer end of the rod; a first piston slidably mounted in the bore and on the rod for relative movement between the first and second stop means; a third stop means on the outer end of the rod; a fourth stop means on the rod between and spaced from the second stop means and the third stop means; an additional piston slidably mounted in the bore and on the rod for relative movement between the tHird and fourth stop means; inner stop means in the bore limiting inward movement of the first piston; outer stop means in the bore limiting outward movement of the first piston; rod means operatively associated with the additional piston for movement therewith, slidably mounted in the bore and projecting from the one end thereof; first fluid passage means communicating with the bore inwardly of the inner stop means; and additional fluid passage means communicating with the bore between the outer stop means and the additional piston; and means for selectively supplying and exhausting fluid from either or both of the fluid passage means.
Claim 2
Dependent Claim
244 words
A fluid actuated control device comprising: a cylinder body having a longitudinally extending bore provided therein and open to one end; a piston rod of a diameter less than the diameter of the bore positioned in the bore; a first stop means on the inner end of the rod; a second stop means on the rod between and spaced from the first stop means and the outer end of the rod; a first piston slidably mounted in the bore and on the rod for relative movement between the first and second stop means; a third stop means on the outer end of the rod; a fourth stop means on the rod between and spaced from the second stop means and the third stop means; an additional piston slidably mounted in the bore and on the rod for relative movement between the tHird and fourth stop means; inner stop means in the bore limiting inward movement of the first piston; outer stop means in the bore limiting outward movement of the first piston; rod means operatively associated with the additional piston for movement therewith, slidably mounted in the bore and projecting from the one end thereof; first fluid passage means communicating with the bore inwardly of the inner stop means; and additional fluid passage means communicating with the bore between the outer stop means and the additional piston; and means for selectively supplying and exhausting fluid from either or both of the fluid passage means.
Claim 3
Dependent Claim
46 words
A fluid actuated control device as claimed in claim 1 further including biasing means for inwardly urging the rod means with a force greater than the thrust of fluid on the base of the piston rod and less than the thrust of fluid on the pistons.
Claim 4
Dependent Claim
19 words
A fluid actuated control device as claimed in claim 1 wherein the rod means bears against the additional piston.
Claim 5
Dependent Claim
20 words
A fluid actuated control device as claimed in claim 1 wherein the rod means is attached to the additional piston.
Claim 6
Dependent Claim
28 words
A fluid actuated control device as claimed in claim 1 wherein the first fluid passage means is of a different cross-sectional area than the second fluid passage means.
Claim 7
Dependent Claim
28 words
A fluid actuated control device as claimed in claim 1 wherein the additional fluid passage means has 4 times the cross-sectional area of the first fluid passage means.
Claim 8
Dependent Claim
292 words
A fluid actuated control device comprising: a cylinder body having a longitudinally extending bore provided therein and open to one end; a piston rod of a diameter less than the diameter of the bore positioned in the bore; a first stop means on the inner end of the rod; a second stop means on the rod between and spaced from the first stop means and the outer end of the rod; a first piston slidably mounted in the bore and on the rod for relative movement between the first and second stop means; a second piston slidably mounted in the bore and fixed to the rod in a position between and spaced from the second stop means and the outer end of the rod; a third stop means on the outer end of the rod; a fourth stop means on the rod between and spaced from the third stop means and the second piston; an additional piston slidably mounted in the bore and on the rod for relative movement between the third and fourth stop means; inner stop means in the bore limiting inward movement of the first piston; outer stop means in the bore limiting outward movement of the first piston; rod means operatively associated with the additional piston for movement therewith, slidably mounted in the bore and projecting from the one end thereof; first fluid passage means communicating with the bore inwardly of the inner stop means; second fluid passage means communicating with the bore between the outer stop means and the second piston; an additional fluid passage means communicating with the bore between the second and additional pistons; and means for selectively supplying and exhausting fluid to and from any selected one or combination of the fluid passage means.
Claim 9
Dependent Claim
292 words
A fluid actuated control device comprising: a cylinder body having a longitudinally extending bore provided therein and open to one end; a piston rod of a diameter less than the diameter of the bore positioned in the bore; a first stop means on the inner end of the rod; a second stop means on the rod between and spaced from the first stop means and the outer end of the rod; a first piston slidably mounted in the bore and on the rod for relative movement between the first and second stop means; a second piston slidably mounted in the bore and fixed to the rod in a position between and spaced from the second stop means and the outer end of the rod; a third stop means on the outer end of the rod; a fourth stop means on the rod between and spaced from the third stop means and the second piston; an additional piston slidably mounted in the bore and on the rod for relative movement between the third and fourth stop means; inner stop means in the bore limiting inward movement of the first piston; outer stop means in the bore limiting outward movement of the first piston; rod means operatively associated with the additional piston for movement therewith, slidably mounted in the bore and projecting from the one end thereof; first fluid passage means communicating with the bore inwardly of the inner stop means; second fluid passage means communicating with the bore between the outer stop means and the second piston; an additional fluid passage means communicating with the bore between the second and additional pistons; and means for selectively supplying and exhausting fluid to and from any selected one or combination of the fluid passage means.
Claim 10
Dependent Claim
46 words
A fluid actuated control device as claimed in claim 7 further including biasing means for inwardly urging the rod means with a force greater than the thrust of fluid on the base of the piston rod and less than the thrust of fluid on the pistons.
Claim 11
Dependent Claim
19 words
A fluid actuated control device as claimed in claim 7 wherein the rod means bears against the additional piston.
Claim 12
Dependent Claim
20 words
A fluid actuated control device as claimed in claim 7 wherein the rod means is attached to the additional piston.
Claim 13
Dependent Claim
46 words
A fluid actuated control device as claimed in claim 7 wherein the first fluid passage means is of a different cross-sectional area than the second fluid passage means and the second fluid passage means is of a different cross-sectional area than the additional fluid passage means.
Claim 14
Dependent Claim
45 words
A fluid actuated control device as claimed in claim 7 wherein the additional fluid passage means has 4 TIMES the cross-sectional area of the first fluid passage means and the second fluid passage means has twice the cross-sectional area of the first fluid passage means.
References Cited (Backward Citations)
US3713364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |