US3870073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve assembly for controlling fluid pressure operated apparatus particularly presses
Assignee: Technomatic AG
•
Filing: 1973-11-16
•
Granted: 1975-03-11
•
Expires: 1993-11-16
Abstract
Abstract A valve assembly for controlling fluid pressure operated apparatus in particular presses comprises two parallel connected valves with axially aligned valve members in the form of pistons axially movable in axially aligned cylinders. Movement of the valve members is controlled by pilot valves supplying pressure fluid selectively to chambers at the rear ends of the cylinders and to annular chambers surrounding the pistons. Axially aligned pins are slidable in aligned bores in the valve pistons and are biased toward one another by springs. In the event the pins are asymmetrically displaced by reason of malfunctioning of the valves, an electric switch means is operated to sound an alarm, shut off the fluid pressure or provide other desired function.
Inventors
- 👤 Erich Ruchser
- 👤 Helmut Ott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:31
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/001; B; B30; B30B; B30B15/00; B30B15/14; B30B15/142; B30B15/28; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87209
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
In a valve assembly for controlling fluid pressure operated apparatus, in particular presses, having a housing, two parallel connected valves comprising two axially aligned valve chambers in said housing, axially aligned valve members in said chambers, and fluid passages in said housing controlled by axial movement of said valve members, and pilot valves controlling the axial movement of said valve members; the improvement comprising an axial bore in each of said valve members, an axially movable control pin in each of said bores for relative movement therewith and electric switch means operable by said control pins upon malfunctioning of said valves.
Claim 2
Dependent Claim
101 words
In a valve assembly for controlling fluid pressure operated apparatus, in particular presses, having a housing, two parallel connected valves comprising two axially aligned valve chambers in said housing, axially aligned valve members in said chambers, and fluid passages in said housing controlled by axial movement of said valve members, and pilot valves controlling the axial movement of said valve members; the improvement comprising an axial bore in each of said valve members, an axially movable control pin in each of said bores for relative movement therewith and electric switch means operable by said control pins upon malfunctioning of said valves.
Claim 3
Dependent Claim
101 words
In a valve assembly for controlling fluid pressure operated apparatus, in particular presses, having a housing, two parallel connected valves comprising two axially aligned valve chambers in said housing, axially aligned valve members in said chambers, and fluid passages in said housing controlled by axial movement of said valve members, and pilot valves controlling the axial movement of said valve members; the improvement comprising an axial bore in each of said valve members, an axially movable control pin in each of said bores for relative movement therewith and electric switch means operable by said control pins upon malfunctioning of said valves.
Claim 4
Dependent Claim
101 words
In a valve assembly for controlling fluid pressure operated apparatus, in particular presses, having a housing, two parallel connected valves comprising two axially aligned valve chambers in said housing, axially aligned valve members in said chambers, and fluid passages in said housing controlled by axial movement of said valve members, and pilot valves controlling the axial movement of said valve members; the improvement comprising an axial bore in each of said valve members, an axially movable control pin in each of said bores for relative movement therewith and electric switch means operable by said control pins upon malfunctioning of said valves.
Claim 5
Dependent Claim
49 words
A valve assembly according to claim 1, in which said control pins are axially aligned with one another and project beyond the forward ends of said valve members when in rest position so that upon movement of said valve members toward one another said control pins engage one another.
Claim 6
Dependent Claim
30 words
A valve assembly according to claim 2, comprising spring means acting between each of said control pins and the respective valve member to bias said control pins toward one another.
Claim 7
Dependent Claim
48 words
A valve assembly according to claim 3, in which said bores extend to the rear ends of said valve members and in which said control pins project beyond the rear ends of said valve members into said valve chambers when said valve members are moved toward one another.
Claim 8
Dependent Claim
25 words
A valve assembly according to claim 4, comprising sealing means between said control pins and said bores for sealing said bores from said valve chambers.
Claim 9
Dependent Claim
45 words
A valve assembly according to claim 1, in which each of said control pins has a tapered shoulder, and in which said switch means comprises a stem portion approximately perpendicular to said control pins and engageable by said tapered shoulders to actuate said switch means.
Claim 10
Dependent Claim
31 words
A valve assembly according to claim 6, in which said switch means comprises two switches both operable by said stem portion upon movement of said stem portion by said control pins.
Claim 11
Dependent Claim
21 words
A valve assembly according to claim 1, comprising a selectively restricted passageway connecting said valve chambers to equalize the pressure therein.
Claim 12
Dependent Claim
62 words
A valve assembly according to claim 1, in which each of said valve chambers is generally cylindrical with a cylindrical wall and a cylindrical restriction, and in which each of said valve members is a piston with axially spaced peripheral sealing means engageable respectively with said cylindrical wall and said cylindrical restriction and with an annular space defined between said sealing means.
References Cited (Backward Citations)
US3139109A
Cited
US3699993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |