Patent US4238112A successfully refreshed from Google Patents.
US4238112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spool spin prevention for hydraulic control valves
Assignee: RACINE FLUID POWER Inc C/O ROBERT BOSCH Corp A CORP OF
•
Filing: 1978-12-22
•
Granted: 1980-12-09
•
Expires: 1998-12-22
Abstract
Abstract An improved hydraulic control valve having means for preventing rotational spinning of the spool caused by flow within the valve that impinges on the outer surfaces of the spool. A washer having a tang that abuts the valve body to prevent rotation is mounted on the flattened surface of a stem extending from the spool fixing the washer and spool against relative rotation but allowing axial displacements therebetween. A second embodiment provides a pin, one end of which extends through an eccentric hole in a washer similarly mounted on the valve stems but lacking the tang. The pin is fixed at one end to a non-rotating member or to the valve body. An alternate configuration has a rectangular slot formed in the valve stem parallel to its longitudinal axis, into which slot a diametrically disposed pin mounted at each end in a non-rotating part is fitted to prevent spool rotation.
Inventors
- 👤 Danny M. Derozier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:54
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0708; F15; F15B; F15B13/00; F15B13/02; F15B13/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
A hydraulic control valve comprising: a valve body having a central chamber and at least one inlet or outlet port through which hydraulic fluid may enter and exit said chamber, a valve spool located within said chamber for opening and closing access between said ports and said chamber; and a washer keyed to said valve spool by the mating contact of a first planar surface on said valve spool and a second planar surface on said washer to prevent the relative rotation of said washer and valve spool, said washer having a surface extending therefrom and contacting said valve body eccentric to the axis of said valve spool to prevent relative rotation of said washer to said valve body, whereby the prevention of said relative rotations of said washer and valve spool and said washer and valve body prevents the rotation of said valve spool about its longitudinal axis relative to said valve body, but allows relative axial displacement between said valve spool and said valve body.
Claim 2
Dependent Claim
167 words
A hydraulic control valve comprising: a valve body having a central chamber and at least one inlet or outlet port through which hydraulic fluid may enter and exit said chamber, a valve spool located within said chamber for opening and closing access between said ports and said chamber; and a washer keyed to said valve spool by the mating contact of a first planar surface on said valve spool and a second planar surface on said washer to prevent the relative rotation of said washer and valve spool, said washer having a surface extending therefrom and contacting said valve body eccentric to the axis of said valve spool to prevent relative rotation of said washer to said valve body, whereby the prevention of said relative rotations of said washer and valve spool and said washer and valve body prevents the rotation of said valve spool about its longitudinal axis relative to said valve body, but allows relative axial displacement between said valve spool and said valve body.
Claim 3
Dependent Claim
74 words
The hydraulic control valve according to claim 1, wherein said valve spool provides a stem portion having thereon said first planar surface positioned eccentric the longitudinal axis of said spool and wherein said washer includes a hole into which is fit said spool stem portion, said hole providing said second planar surface for engaging said first planar surface therby prventing relative rotation but allowing relative axial displacement between said valve spool and said washer.
Claim 4
Dependent Claim
33 words
The hydraulic control valve according to claim 2, wherein said surface extending from said washer fits within an inlet or outlet port and contacts said valve body on the wall of the port.
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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |