Patent US3724334A successfully refreshed from Google Patents.
US3724334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical driving
Assignee: Nutron Corp
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Filing: 1971-06-11
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Granted: 1973-04-03
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Expires: 1991-06-11
Abstract
Abstract A fluid device including, in a first aspect, a fixed member defining a first cam surface having m cycles, a movable member defining a second cam surface having n cycles, and a movable piston support carrying fewer than the greater of m and n pistons each of which is mounted for movement relative to the piston support and engages the cam surface; and, including in a second aspect, a hydrostatic piston assembly mounted on a piston support for movement relative thereto in engagement with at least two cam surfaces.
Inventors
- 👤 J Denker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:04
CPC Classifications
F; F03; F03C; F03C1/00; F03C1/02; F03C1/04; F03C1/0403; F03C1/0409; F03C1/0431; F03C1/22; F03C1/24; F03C1/2407; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
78 words
A device comprising a fixed cam defining a first cam surface having M cam cycles; a movable cam defining a second cam surface having N cam cycles; a movable piston support; and, P pistons mounted on said support for movement relative thereto, each of said pistons engaging said first cam surface and said second cam surface, M and N being integers, M being not equal to N, and P being less than the greater of M and N.
Claim 2
Independent Claim
78 words
A device comprising a fixed cam defining a first cam surface having M cam cycles; a movable cam defining a second cam surface having N cam cycles; a movable piston support; and, P pistons mounted on said support for movement relative thereto, each of said pistons engaging said first cam surface and said second cam surface, M and N being integers, M being not equal to N, and P being less than the greater of M and N.
Claim 3
Dependent Claim
12 words
The device of claim 1 wherein P is equal to M-N .
Claim 4
Dependent Claim
16 words
The device of claim 1 wherein said pistons are regularly spaced at intervals of 360/P degrees.
Claim 5
Dependent Claim
14 words
The device of claim 1 wherein said cam surfaces face in generally opposite directions.
Claim 6
Dependent Claim
59 words
The device of claim 1 wherein each of said cam surfaces is closed, the amplitude of each cycle of said first cam surface is equal to the amplitude of each cycle of said second cam surfaces, each of the cycles of said first cam surface are identical and each of the cycles of said second cam surface are identical.
Claim 7
Dependent Claim
31 words
The device of claim 1 wherein said movable cam is mounted for rotation relative to said fixed cam and said piston support is mounted for rotation relative to said fixed cam.
Claim 8
Dependent Claim
20 words
The device of claim 6 wherein said pistons are movable radially of the axis of rotation of said piston support.
Claim 9
Dependent Claim
30 words
The device of claim 7 wherein each of said cam surfaces is annular, one of said surfaces faces generally radially outwardly, and the other of said surfaces faces radially inwardly.
Claim 10
Dependent Claim
32 words
The device of claim 1 wherein said device includes a third cam defining a third cam surface having M or N cycles, and each of said pistOns engages said third cam surface.
Claim 11
Dependent Claim
21 words
The device of claim 9 wherein said third cam surface is identical to one of said first and second cam surfaces.
Claim 12
Dependent Claim
49 words
The device of claim 1 wherein said piston support is mounted for rotation relative to said fixed cam and includes P regularly spaced bores, and each of said pistons includes a first portion mounted at least in part within one of said bores for movement relative to said support.
Claim 13
Dependent Claim
33 words
The device of claim 11 wherein each of said pistons includes a second portion on which a pair of followers are movably mounted, each of said followers engaging one of said cam surfaces.
Claim 14
Dependent Claim
36 words
The device of claim 12 wherein each of said followers is mounted within a recess in said second portion, and said piston includes conduits providing fluid communication between said one bore and each of said recesses.
Claim 15
Dependent Claim
47 words
The device of claim 13 including a third cam defining a third cam surface having M or N cycles, and wherein each of said pistons includes three followers mounted on said second portion for movement relative thereto, each of said followers engaging one of said cam surfaces.
Claim 16
Dependent Claim
25 words
The device of claim 13 wherein one of said cam surfaces faces generally radially inwardly and another of said cam surfaces faces generally radially outwardly.
Claim 17
Dependent Claim
106 words
In a fluid device including at least two cam surfaces, a piston support movable relative to the cam surfaces, and a piston mounted on the support for movement relative thereto in engagement with the cam surfaces, that improvement wherein the piston comprises a hydrostatic piston assembly including: a first portion mounted at least in part within a bore in said support; a second portion fixed to said first portion and extending exteriorly of said bore; at least two followers mounted within a recess in said support portion and engaging respective ones of said cam surfaces; and conduits providing fluid communication between said followers and said bore.
Claim 18
Dependent Claim
106 words
In a fluid device including at least two cam surfaces, a piston support movable relative to the cam surfaces, and a piston mounted on the support for movement relative thereto in engagement with the cam surfaces, that improvement wherein the piston comprises a hydrostatic piston assembly including: a first portion mounted at least in part within a bore in said support; a second portion fixed to said first portion and extending exteriorly of said bore; at least two followers mounted within a recess in said support portion and engaging respective ones of said cam surfaces; and conduits providing fluid communication between said followers and said bore.
Claim 19
Dependent Claim
39 words
The device of claim 16 wherein each of said followers defines a pair of oppositely facing concave surfaces and includes a conduit extending between said surfaces, one of said concave surfaces facing and engaging each of said cam surfaces.
Claim 20
Dependent Claim
41 words
The device of claim 16 including a third cam surface and wherein said piston includes three followers mounted for movement on and relative to said second portion independently of each other, each of said followers engaging one of said cam surfaces.
Claim 21
Dependent Claim
50 words
The device of claim 16 wherein said second portion includes a cylindrical bore extending longitudinally thereof in which said followers are mounted, and defines an opening overlying each of said followers, each of said followers engaging a respective one of said cam surfaces through a respective one of said openings.
Claim 22
Dependent Claim
51 words
The device of claim 19 wherein each of said followers defines a pair of oppositely facing concave surfaces, one of said concave surfaces engaging each of said cam surfaces, and said piston assembly includes conduits permitting fluid communication between each of said concave surfaces and said bore of said piston support.
Claim 23
Dependent Claim
48 words
The device of claim 20 wherein each of said followers includes a conduit extending between the concave surfaces of said each follower, and said piston assembly includes a conduit extending from a surface thereof within said bore of said piston support to said bore of said second portion.
Claim 24
Dependent Claim
39 words
The device of claim 21 wherein each of said followers includes an outer generally cylindrical surface in closely spaced relationship to the surface of said bore of said piston support and a central bore extending coaxially through said follower.
Claim 25
Dependent Claim
38 words
The device of claim 22 including a third cam surface and wherein said piston assembly includes three followers mounted for movement on and relative to said second portion, each of said followers engaging one of said cam surfaces.
Claim 26
Dependent Claim
31 words
The device of claim 23 wherein one of said cam surfaces faces in one direction and another of said cam surfaces faces in a direction generally opposite to said one direction.
Claim 27
Dependent Claim
38 words
The device of claim 24 wherein said piston support is mounted for rotation about an axis, said cam surfaces are generally annular and are mounted coaxially with said piston support, and said one direction is generally radially inwardly.
Claim 28
Dependent Claim
37 words
The device of claim 20 wherein each of followers includes a pair of axially spaced, radially outwardly facing channels, one of said pair being positioned on each axial side of the concave surfaces of said each follower.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |