US3823651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic assemblies
Assignee: Girling Ltd
•
Filing: 1972-07-26
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Granted: 1974-07-16
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Expires: 1992-07-26
Abstract
Abstract A repeater transmission comprises two similar hydraulic assemblies and transmits both linear and rotary movement. In each assembly, there is a first piston immovable on a piston rod and a second piston engaged with the piston rod by a fast-thread arrangement such that axial movement of the second piston along the rod causes the rod to rotate and rotation of the rod causes the second piston to move along the rod. In a second embodiment, the second piston is engaged nonrotationally with, but slidably on, the rod and is engaged with an internally fast-threaded collar which is non-rotational in the cylinder.
Inventors
- 👤 M Ogilvie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:38
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/02; F15B15/06; F15B15/063; F15B7/00; F15B7/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A hydraulic assembly comprising a housing defining a cylinder, first and second pistons within the cylinder, a piston rod on which the first piston is axially immovable, the first piston being slidable along the cylinder, and first and second means connecting the second piston respectively to the housing and to the piston rod, one of said means being a reversable screw-threaded engagement means and the other anti-rotation means disposed to prevent rotation of the second piston with respect to the piston rod while allowing axial movement of the second piston along the piston rod, the assembly being so arranged that movement of the piston rod axially causes axial movement of the first piston and so that rotary movement of the rod causes axial movement of the second piston, and the assembly also being such that axial movement of the second piston causes rotation of the rod.
Claim 2
Dependent Claim
146 words
A hydraulic assembly comprising a housing defining a cylinder, first and second pistons within the cylinder, a piston rod on which the first piston is axially immovable, the first piston being slidable along the cylinder, and first and second means connecting the second piston respectively to the housing and to the piston rod, one of said means being a reversable screw-threaded engagement means and the other anti-rotation means disposed to prevent rotation of the second piston with respect to the piston rod while allowing axial movement of the second piston along the piston rod, the assembly being so arranged that movement of the piston rod axially causes axial movement of the first piston and so that rotary movement of the rod causes axial movement of the second piston, and the assembly also being such that axial movement of the second piston causes rotation of the rod.
Claim 3
Dependent Claim
34 words
A hydraulic assembly according to claim 1, wherein the screw-threaded engagement means is between the second piston and the piston rod with the anti-rotation means being between the second piston and the cylinder''s wall.
Claim 4
Dependent Claim
35 words
A hydraulic assembly according to claim 1, in which the cylinder is divided into sub-cylinders by a stationary partition and wherein the first piston is in one sub-cylinder and the second piston in a second.
Claim 5
Dependent Claim
27 words
A hydraulic assembly according to claim 1, wherein there is a pair of first pistons defining between themselves a sub-cylinder in which the second piston is movable.
Claim 6
Dependent Claim
31 words
A hydraulic assembly according to claim 1 wherein the screw-threaded engagement means connects the second piston to the housing and the anit-rotation means connects the second piston to the piston rod.
References Cited (Backward Citations)
US1173326A
Cited
US2918799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |