US3833988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making spool valves
Assignee: Individual
•
Filing: 1972-10-24
•
Granted: 1974-09-10
•
Expires: 1992-10-24
Abstract
Abstract A method of making a spool valve includes forming perforations in the core and sleeve members of the valve in a single machine operation. The perforations are formed offset from and parallel to a plane which includes the axis of the core and sleeve members. The perforations may take a wide variety of shapes including round, rectangular or peripheral channels. The valve becomes functional by rotating or longitudinally adjusting the relative positions of the core and sleeve members to selectively align or block the perforations of the core member with respect to the sleeve member.
Inventors
- 👤 J Tobias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:08
CPC Classifications
B; B23; B23P; B23P13/00; B23P13/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86646; Y10T137/86654; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49426; Y10T29/49826; Y10T29/49861
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
60 words
A method of making a spool valve structure having a cylindrical core member rotatably enclosed in a sleeve member, said method comprising the step of forming in a single machine operation a first perforation entirely through both of said members on a transverse axis parallel to and offset to one side of a plane containing the longitudinal axes of said
Claim 2
Independent Claim
60 words
A method of making a spool valve structure having a cylindrical core member rotatably enclosed in a sleeve member, said method comprising the step of forming in a single machine operation a first perforation entirely through both of said members on a transverse axis parallel to and offset to one side of a plane containing the longitudinal axes of said
Claim 3
Dependent Claim
21 words
The method according to claim 1 wherein said members are retained against movement relative to each other during said forming operation.
Claim 4
Dependent Claim
27 words
The method according to claim 2 and including the step oF forming a second perforation as therein defined, said two perforations being spaced radially from each other.
Claim 5
Dependent Claim
27 words
The method according to claim 2 and including the step of forming a second perforation as therein defined, said two perforations being spaced longitudinally from each other.
Claim 6
Dependent Claim
23 words
The method according to claim 3 and including forming said first and second perforation on axes offset from opposite sides of said plane.
Claim 7
Dependent Claim
23 words
The method according to claim 4 and including forming said first and second perforation on axes offset from opposite sides of said plane.
Claim 8
Dependent Claim
30 words
The method according to claim 4 and including the step of forming an axially extending hole in said core member to effect fluid connection between said first and second perforations.
Claim 9
Dependent Claim
29 words
The method according to claim 2 wherein said perforation is in the form of a peripheral channel with congruent boundaries at the interface of said core and sleeve members.
Claim 10
Dependent Claim
16 words
The method according to claim 8 wherein a second peripheral channel is formed in said core.
Claim 11
Dependent Claim
26 words
The method according to claim 2 wherein said perforation is a generally cylindrical hole with congruent boundaries at the interface of said core and sleeve members.
Claim 12
Dependent Claim
22 words
The method according to claim 4 wherein said first perforation is a peripheral channel and said second perforation is a cylindrical hole.
Claim 13
Dependent Claim
13 words
The method according to claim 4 wherein both said perforations are peripheral channels.
Claim 14
Dependent Claim
20 words
The method according to claim 1 and including forming a second perforation in said sleeve member intermediate said two ports.
Claim 15
Dependent Claim
15 words
The method according to claim 2 in which said forming operation is electrical discharge machining.
Claim 16
Dependent Claim
41 words
The method according to claim 2 wherein the step of retaining said core and sleeve members against movement comprises applying an adhesive material to said members prior to said forming operation and removing said adhesive material subsequent to said forming operation.
Claim 17
Dependent Claim
22 words
The method according to claim 14 and including using a meltable epoxy material to retain said sleeve and core member against movement.
Claim 18
Dependent Claim
39 words
The method according to claim 15 and including the steps of using electrical discharge machining and then melting said epoxy material to permit said core and sleeve members to be separated from each other following the perforation forming step.
References Cited (Backward Citations)
US686311A
Cited
US1154746A
Cited
US972292A
Cited
US2328606A
Cited
US2595695A
Cited
US3052013A
Cited
US3299417A
Cited
US3474710A
Cited
US3685135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |