US3786723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic oscillator
Assignee: SPX Technologies Inc
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Filing: 1972-05-15
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Granted: 1974-01-22
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Expires: 1992-05-15
Abstract
Abstract The disclosure concerns a hydraulic oscillator of the type in which the distributing valve for the power element is shifted by pressures developed by pumping members operated by the power element. The device is relatively simple and is truly selfstarting regardless of the position in which the power element is resting. Preferably, the distributing valve acts as a flow divider which diverts a portion of the supply flow to tank, and thereby precludes development of large pressure peaks at the ends of the strokes of the power element. Moreover, the flow-dividing action is adjustable so that oscillator frequency can be selected independently of the rate of supply.
Inventors
- 👤 W Fruehauf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:56
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/18; B06B1/183; F; F03; F03C; F03C1/00; F03C1/08; F03C1/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
316 words
A hydraulic oscillator comprising a. a double-acting motor having a power element movable in a first direction under the action of fluid pressure in one working space and in a second direction under the action of fluid pressure in a second, opposed working space; b. a four-way distributing valve movable between a first position in which it establishes a supply path leading from an inlet connection to said one working space and a return path leading from said second working space to an exhaust connection, and a second position in which it reverses the connections between said paths and working spaces; c. means biasing the distributing valve towards the first position; d. a pair of valve-actuating motors having unequal effective areas and acting on the distributing valve in oppositon to each other, the larger motor serving to shift the valve toward the second position; e. first booster pumping means including a first booster cylinder connected with the second working space and with the larger valve-actuating motor, a first pumping member operated by the power element for restricting the connection between the first booster cylinder and the second working space during a terminal portion of movement of the power element in said first direction for forcing fluid from the first booster cylinder to the larger valve-actuating motor during said terminal portion of movement; f. second booster pumping means including a second booster cylinder connected with the first working space and with the smaller valve-actuating motor, a second pumping member operated by the power element for restricting the connection between the second booster cylinder and the first working space during a terminal portion of movement of the power element in said second direction for forcing fluid from the second booster cylinder to the smaller valve-actuating motor during said terminal portion of movement; and g. a restricted transfer passage connecting the booster pumping means with the larger actuating motor.
Claim 2
Dependent Claim
316 words
A hydraulic oscillator comprising a. a double-acting motor having a power element movable in a first direction under the action of fluid pressure in one working space and in a second direction under the action of fluid pressure in a second, opposed working space; b. a four-way distributing valve movable between a first position in which it establishes a supply path leading from an inlet connection to said one working space and a return path leading from said second working space to an exhaust connection, and a second position in which it reverses the connections between said paths and working spaces; c. means biasing the distributing valve towards the first position; d. a pair of valve-actuating motors having unequal effective areas and acting on the distributing valve in oppositon to each other, the larger motor serving to shift the valve toward the second position; e. first booster pumping means including a first booster cylinder connected with the second working space and with the larger valve-actuating motor, a first pumping member operated by the power element for restricting the connection between the first booster cylinder and the second working space during a terminal portion of movement of the power element in said first direction for forcing fluid from the first booster cylinder to the larger valve-actuating motor during said terminal portion of movement; f. second booster pumping means including a second booster cylinder connected with the first working space and with the smaller valve-actuating motor, a second pumping member operated by the power element for restricting the connection between the second booster cylinder and the first working space during a terminal portion of movement of the power element in said second direction for forcing fluid from the second booster cylinder to the smaller valve-actuating motor during said terminal portion of movement; and g. a restricted transfer passage connecting the booster pumping means with the larger actuating motor.
Claim 3
Dependent Claim
36 words
A hydraulic oscillator as defined in claim 1 in which the distributing valve also establishes a restricted diversion path leading from the supply connection to the exhaust connection in each of said first and second positions.
Claim 4
Dependent Claim
67 words
in said second position, the first intermediate passage is in unrestricted communication with the adjacent end passage through one groove and is in restricted communication with the central passage of the central land, and the second intermediate passage is isolated from free communication with the adjacent end passage by the other end land and is in unrestricted communication with the central passage through the other peripheral groove.
Claim 5
Dependent Claim
67 words
in said second position, the first intermediate passage is in unrestricted communication with the adjacent end passage through one groove and is in restricted communication with the central passage of the central land, and the second intermediate passage is isolated from free communication with the adjacent end passage by the other end land and is in unrestricted communication with the central passage through the other peripheral groove.
Claim 6
Dependent Claim
35 words
A hydraulic oscillator as defined in claim 2 in which the distributing valve maintains said diversion path open, but reduces the restriction to flow through it, as it moves between said first and second positions.
Claim 7
Dependent Claim
21 words
A hydraulic oscillator as defined in claim 2 including adjustable means for varying the restriction to flow through the diversion path.
Claim 8
Dependent Claim
105 words
A hydraulic oscillator as defined in claim 1 in which the distributing valve comprises a. a bore intersected by five axially spaced passages, there being a central passage which constitutes said supply connection, a pair of end passages whiCh constitute said exhaust connection, and an intermediate passage located between the central passage and each end passage and connected with one or the other of the working spaces; and b. a spool reciprocable in the bore and formed with two axially spaced peripheral grooves which define a central land and a pair of end lands, c. the parts of the distributing valve being so arranged that,
Claim 9
Dependent Claim
134 words
A hydraulic osciallator as defined in claim 5 in which a. the edges at opposite sides of the central land lie in planes normal to the longitudinal axis of the spool; and b. the distributing valve includes adjustable stops which cooperate with the spool to define said first and second positions, c. adjustment of one stop serving to shift said first position axially relatively to the passages and thereby vary the restriction to flow from the central passage to the second intermediate passage across said one edge of the central land, and d. adjustment of the other stop serving to shift said second position axially relatively to the passages and thereby vary the restriction to flow from the central passage to the first intermediate passage across said opposite edge of the central land, and
Claim 10
Dependent Claim
104 words
A hydraulic oscillator as defined in claim 5 in which a. the edges at opposite sides of the central land lie in planes which are inclined in opposite directions with respect to the longitudinal axis of the spool; and b. distributing valve includes adjustment means for rotating the spool about its longitudinal axis and for locking it in a selected rotary position, c. whereby the restriction to flow from the central passage to the second intermediate passage in said first position and the restriction to flow from the central passage to the first intermediate passage in said second position can be varied in unison.
Claim 11
Dependent Claim
21 words
A hydraulic oscillator as defined in claim 1 which includes means for varying the restriction in flow through the transfer passage.
Claim 12
Dependent Claim
52 words
A hydraulic oscillator as defined in claim 8 in which the transfer passage is restricted by a transverse orifice member which is pierced by a plurality of bores of different diameters, and which is movable to predetermined positions in each which flow through the transfer passage is restricted by a different bore.
Claim 13
Dependent Claim
100 words
A hydraulic oscillator as defined in claim 1 in which a. the double-acting motor includes a power cylinder containing a conforming reciprocable power piston which divides it into said opposed working spaces; and b. each booster pumping means comprises a booster cylinder which is aligned with and has a smaller diameter than the power cylinder, and a booster piston carried by the power piston and which serves as the pumping member of the booster means pumping, c. the effective areas of the two booster pistons being equal, and each is sized to fit its cylinder with a predetermined radial clearance.
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |