US3818801A
Expired / Lapsed
US
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Fluid actuating mechanism having alternatively selectable fast and slow modes of operation
Assignee: Hydron Inc
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Filing: 1973-01-29
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Granted: 1974-06-25
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Expires: 1993-01-29
Abstract
Abstract A fluid actuating mechanism is provided having mechanically intercoupled first and second piston and cylinder units coupled with a fluid source and control circuit to selectively enable fast or slow modes of operation in either direction. The piston and cylinder units are of a double acting type with double-ended piston rod and having selectively operable valving to permit fluid flow between the two cylinder chambers. The piston rods of each unit are of relatively different diameters and are inversely oriented as between the two units, such that a fast mode of operation may be effected by directing a small pressurized fluid flow to one cylinder with the bulk of the fluid merely transferred between the chambers through the opened selectively operable valving. A slow mode of operation capable of exerting a substantial force is obtained by closing the selectively operable valving and directing a small pressurized fluid flow to one chamber of each cylinder. In one embodiment of this invention, the selectively operable valving is located in the pistons to reduce fluid transfer conduits required externally of the apparatus.
Inventors
- 👤 J Kime
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:31
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/024; B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6764; B29C45/6771; B30; B30B; B30B15/00; B30B15/16; B30B15/161; F15B11/16; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447; F15B15/149; F15B15/20; F15B15/202; F15B15/204; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20507; F15B2211/20515; F15B2211/2053; F15B2211/20546; F15B2211/20561; F15B2211/20576; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30525; F15B2211/31; F15B2211/3122; F15B2211/3133; F15B2211/315; F15B2211/3157; F15B2211/31588; F15B2211/31594; F15B2211/32; F15B2211/327; F15B2211/60; F15B2211/61; F15B2211/613; F15B2211/625; F15B2211/70; F15B2211/71; F15B2211/7107; F15B2211/7114; F15B2211/7128; F15B2211/75
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
207 words
A fluid actuating mechanism comprising first and second double-acting cylinder and piston units with the cylinder and pistOn unit of each relatively axially reciprocable, each said piston dividing the respective cylinder into first and second chambers and having a double-ended piston rod extending axially thereto through both cylinder chambers and mechanically coupled in fixed relationship with the other and said cylinders mechanically coupled in fixed relationship with each other, the diameter of the opposite ends of each piston rod being relatively different with said first and second cylinder and piston units being relatively oppositely oriented with respect to the larger and smaller piston rod ends, fluid valve means mounted in fluid communicating relationship between said first and second chambers, said valve means selectively operable to either a fluid conducting or a fluid blocking position, and fluid circuit means connected in fluid flow relationship with said cylinder and piston units and operable to provide pressurized fluid to selected ones of said cylinder chambers resulting in relatively fast axial movement of said cylinder and piston units with low force when said fluid valve means is in a fluid conducting position and relatively slow axial movement with high force when said fluid valve means is in a fluid blocking position.
Claim 2
Dependent Claim
207 words
A fluid actuating mechanism comprising first and second double-acting cylinder and piston units with the cylinder and pistOn unit of each relatively axially reciprocable, each said piston dividing the respective cylinder into first and second chambers and having a double-ended piston rod extending axially thereto through both cylinder chambers and mechanically coupled in fixed relationship with the other and said cylinders mechanically coupled in fixed relationship with each other, the diameter of the opposite ends of each piston rod being relatively different with said first and second cylinder and piston units being relatively oppositely oriented with respect to the larger and smaller piston rod ends, fluid valve means mounted in fluid communicating relationship between said first and second chambers, said valve means selectively operable to either a fluid conducting or a fluid blocking position, and fluid circuit means connected in fluid flow relationship with said cylinder and piston units and operable to provide pressurized fluid to selected ones of said cylinder chambers resulting in relatively fast axial movement of said cylinder and piston units with low force when said fluid valve means is in a fluid conducting position and relatively slow axial movement with high force when said fluid valve means is in a fluid blocking position.
Claim 3
Dependent Claim
59 words
A fluid actuating mechanism according to claim 1 wherein said fluid valve means is mounted in said piston and said piston rods are formed with first and second fluid passages externally connecting with said fluid circuit means, said first and second passages communicating with said first and second cylinder chambers respectively, at a point closely adjacent the associated piston.
Claim 4
Dependent Claim
71 words
A fluid actuating mechanism according to claim 1 wherein said fluid valve means of each of said cylinder and piston units is mounted in the respective piston and includes a movable valve element and valve seat cooperating therewith in a fluid passage and fluid means cooperating with said valve element to maintain said valve element in fluid blocking relationship to said seat when pressurized fluid is applied to said fluid means.
Claim 5
Dependent Claim
33 words
A fluid actuating mechanism according to claim 3 wherein said piston rods are formed with a fluid passage communicating with said fluid means and selectively connectable with an external source of pressurized fluid.
Claim 6
Dependent Claim
67 words
A fluid actuating mechanism according to claim 1 wherein said fluid circuit means includes valve means connected in fluid flow controlling relationship to said chambers of each of said cylinders, said valve means selectively operable to either connect both chambers of one cylinder to a source of pressurized fluid or to connect the chambers at the same end of both cylinders to a source of pressurized fluid.
Claim 7
Dependent Claim
35 words
A fluid actuating mechanism according to claim 1 having a plurality of said pairs of first and second cylinder and piston units connected in parallel relationship therewith with said fluid circuit means for concurrent operation.
Claim 8
Dependent Claim
26 words
A fluid actuating mechanism according to claim 1 wherein said fluid circuit means is selectively operable to provide fast or slow operation in either axial direction.
Claim 9
Dependent Claim
172 words
A fluid actuating mechanism comprising first and second double-acting cylinder and piston units with the cylinder and piston unit of each relatively axially reciprocable, each said piston dividing the respective cylinder into first and second chambers and having a piston rod extending axially thereto and mechanically coupled in fixed relationship with the other and said cylinders mechanically coupled in fixed relationship with each other, each of said pistons having fluid valve means mounted therein in fluid communicating relationship between said first and second chambers, said valve means selectively operable to either a fluid conducting or a fluid blocking position, and fluid circuit means connected in fluid flow relationship with said cylinder and piston units and operable to provide pressurized fluid to selected ones of said cylinder chambers resulting in relatively fast axial movement of said cylinder and piston units with low force when said fluid valve means is in a fluid conducting position and relatively slow axial movement with high force when said fluid valve means is in a fluid blocking position.
Claim 10
Dependent Claim
172 words
A fluid actuating mechanism comprising first and second double-acting cylinder and piston units with the cylinder and piston unit of each relatively axially reciprocable, each said piston dividing the respective cylinder into first and second chambers and having a piston rod extending axially thereto and mechanically coupled in fixed relationship with the other and said cylinders mechanically coupled in fixed relationship with each other, each of said pistons having fluid valve means mounted therein in fluid communicating relationship between said first and second chambers, said valve means selectively operable to either a fluid conducting or a fluid blocking position, and fluid circuit means connected in fluid flow relationship with said cylinder and piston units and operable to provide pressurized fluid to selected ones of said cylinder chambers resulting in relatively fast axial movement of said cylinder and piston units with low force when said fluid valve means is in a fluid conducting position and relatively slow axial movement with high force when said fluid valve means is in a fluid blocking position.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |