US3773083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control apparatus
Assignee: Kemp Industries Inc
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Filing: 1972-03-28
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Granted: 1973-11-20
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Expires: 1992-03-28
Abstract
Abstract A hydraulic control apparatus for a hydraulic motor including, an isolator valve, first and second motor lines for connecting said isolator valve to a pressure source, third and fourth motor lines for connecting said isolator valve to said motor, said isolator valve comprising, a valve casing having an elongate chamber having an axis, and a spool assembly received in said chamber coaxially therewith, said spool assembly including, an elongate spool member having axially opposite end faces, first spring means disposed in bearing against one end face, and second spring means disposed in bearing against the opposite end face.
Inventors
- 👤 R Hague
- 👤 E Hantman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:33
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
318 words
A hydraulic control apparatus comprising, a valve casing having an elongate chamber having an axis, and a spool assembly received in said chamber coaxially therewith, said valve casing including, first and second lines for connecting said chamber to a pressure source, and third and fourth lines for connecting said chamber to a motor, and said spool assembly including, an elongate spool member having axially opposite first and second end faces, first spring means disposed in bearing against said first end face, second spring means disposed in bearing against said second end face, and adjusting means disposed within said chamber and arranged to adjust the null position of said spool assembly relative to said valve casing, said spool member having a pair of axially spaced annular grooves forming therebetween a center raised portion and forming a pair of opposite end raised portions disposed axially outwardly therefrom, each said end portion having an axially inner face having a radial groove, wherein said valve casing includes a valve body, a first end cap and a second end cap, said end caps connecting to axially opposite ends of said valve body, said valve body having an elongate sleeve member having an elongate bore portion, said sleeve member having first and second and third upper ports connecting to said first motor line, said sleeve member having fourth and fifth and sixth upper ports connecting to said second motor line, said sleeve member having a first lower port connecting to said thrid motor line and having a second lower port connecting to said fourth motor line, said first end cap having a recess facing one end of said elongate bore portion and said second end cap having a recess facing the other end of said elongate bore portion together forming said elongate chamber, said adjusting menas having an adjusting screw threaded into said second end cap and bearing against said spool assembly coaxially therewith.
Claim 2
Dependent Claim
318 words
A hydraulic control apparatus comprising, a valve casing having an elongate chamber having an axis, and a spool assembly received in said chamber coaxially therewith, said valve casing including, first and second lines for connecting said chamber to a pressure source, and third and fourth lines for connecting said chamber to a motor, and said spool assembly including, an elongate spool member having axially opposite first and second end faces, first spring means disposed in bearing against said first end face, second spring means disposed in bearing against said second end face, and adjusting means disposed within said chamber and arranged to adjust the null position of said spool assembly relative to said valve casing, said spool member having a pair of axially spaced annular grooves forming therebetween a center raised portion and forming a pair of opposite end raised portions disposed axially outwardly therefrom, each said end portion having an axially inner face having a radial groove, wherein said valve casing includes a valve body, a first end cap and a second end cap, said end caps connecting to axially opposite ends of said valve body, said valve body having an elongate sleeve member having an elongate bore portion, said sleeve member having first and second and third upper ports connecting to said first motor line, said sleeve member having fourth and fifth and sixth upper ports connecting to said second motor line, said sleeve member having a first lower port connecting to said thrid motor line and having a second lower port connecting to said fourth motor line, said first end cap having a recess facing one end of said elongate bore portion and said second end cap having a recess facing the other end of said elongate bore portion together forming said elongate chamber, said adjusting menas having an adjusting screw threaded into said second end cap and bearing against said spool assembly coaxially therewith.
Claim 3
Dependent Claim
65 words
The apparatus as claimed in claim 1, wherein said sleeve member has a radial outer surface and has a radial inner bore surface, said radial outer surface having a plurality of axially spaced annular grooves, said sleeve member having a plurality of axially spaced annular seal rings mounted on said outer surface, each said seal ring being disposed between a pair of adjacent annular grooves.
Claim 4
Dependent Claim
40 words
The apparatus as claimed in claim 2, wherein said axially spaced annular grooves include six annular grooves, each said annular groove having a plurality of peripherally spaced radial holes extending through said inner surface forming said upper and lower ports.
Claim 5
Dependent Claim
43 words
The apparatus as claimed in claim 3, wherein said valve body has a first passage connecting said first line to two of said upper ports, and wherein said valve body has a second passage connecting to two other ports of said upper ports.
Claim 6
Dependent Claim
106 words
The apparatus as claimed in claim 1, including a control valve, a pressure source, and a pressure line and return line connecting said control valve to said pressure source, said control valve comprising, an elongate cylinder having an axis, an elongate control piece disposed in said cylinder coaxially therewith, said cylinder having a first pressure port and a second pressure port connecting to said pressure line, said cylinder having a first return port and a second return port connecting to said return line, said cylinder having a first motor line port and a second motor line port respectively connecting to said first and second motor lines.
Claim 7
Dependent Claim
84 words
The apparatus as claimed in claim 5, wherein said isolator valve has a port plate, said port plate having an upper surface and a lower surface, said upper surface having a first hole connecting to said third motor line and having a second hole connecting to said fourth motor line, said lower surface having a first arcuate slot connecting to said first hole and having a second arcuate slot connecting to said second hole, said first and second arcuate slots having substantially equal radii.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |