US3670767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety valve assembly for controlling clutch and brake in power press or the like
Assignee: CONNELL INDUSTRIES LP ONE MASS TECH CENTER BOSTON MA 02128
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Filing: 1971-03-08
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Granted: 1972-06-20
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Expires: 1991-03-08
Abstract
Abstract A valve assembly for a pressurized fluid line controlling a clutch and brake made up of a pair of valves having movable valve members with separate actuators, each of the valve members having inlet ports and outlet ports, the inlet ports being connected in series and the outlet ports being connected effectively in parallel so that both valves must be activated to pass the pressurized fluid to the control line and so that upon unwanted sticking of one of the valve members in activated position, pressure fluid to the control line is cut off and exhaust fluid from the line is promptly and directly vented.
Inventors
- 👤 Kenneth R Mahorney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:15
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/001; B; B30; B30B; B30B15/00; B30B15/14; B30B15/142; F15B13/00; F15B13/02; F15B13/06; F15B13/08; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87209
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
307 words
A safety valve assembly for supplying pressurized fluid from a supply line to a clutch and brake control line to energize the clutch and de-energize the brake and for alternatively exhausting fluid from the control line to an exhaust line to de-energize the clutch and energize the brake which comprises means defining a fluid supply line chamber and an intermediate chamber as well as a control line chamber and an exhaust line chamber, a first valve having a movable valve member cooperating with first and second seats, the first seat being normally closed and the second seat being normally open and having an actuator for activating Such valve member, a second valve having a movable valve member cooperating with third and fourth seats, the third seat being normally closed and the fourth seat being normally open and having an actuator for activating such valve member, the first seat being interposed between the supply line chamber and the intermediate chamber and the third seat being interposed between the intermediate chamber and the control line chamber so that such seats are effectively in series with one another with pressurized fluid being passed successively through the first and third seats from the supply line chamber to the control line chamber when the valve members are simultaneously activated by the actuators, the second and fourth seats being both interposed between the control line chamber and the exhaust line chamber with such seats being effectively in parallel with one another so that in the event either one of the movable valve members, upon deactuation, sticks in its activated position (a) flow of pressurized fluid from the supply line will be cut off and (b) direct access for exhausted fluid will be provided from the control line to the exhaust line for insuring that the clutch and brake are in a safe condition.
Claim 2
Dependent Claim
307 words
A safety valve assembly for supplying pressurized fluid from a supply line to a clutch and brake control line to energize the clutch and de-energize the brake and for alternatively exhausting fluid from the control line to an exhaust line to de-energize the clutch and energize the brake which comprises means defining a fluid supply line chamber and an intermediate chamber as well as a control line chamber and an exhaust line chamber, a first valve having a movable valve member cooperating with first and second seats, the first seat being normally closed and the second seat being normally open and having an actuator for activating Such valve member, a second valve having a movable valve member cooperating with third and fourth seats, the third seat being normally closed and the fourth seat being normally open and having an actuator for activating such valve member, the first seat being interposed between the supply line chamber and the intermediate chamber and the third seat being interposed between the intermediate chamber and the control line chamber so that such seats are effectively in series with one another with pressurized fluid being passed successively through the first and third seats from the supply line chamber to the control line chamber when the valve members are simultaneously activated by the actuators, the second and fourth seats being both interposed between the control line chamber and the exhaust line chamber with such seats being effectively in parallel with one another so that in the event either one of the movable valve members, upon deactuation, sticks in its activated position (a) flow of pressurized fluid from the supply line will be cut off and (b) direct access for exhausted fluid will be provided from the control line to the exhaust line for insuring that the clutch and brake are in a safe condition.
Claim 3
Dependent Claim
50 words
The combination as claimed in claim 1 in which the movable valve members are each in the form of a spool having spaced, inwardly facing flanges cooperating with opposed outwardly facing valve seats with the spools being movable endwise through a limited displacement for alternative closing of the valve seats.
Claim 4
Dependent Claim
32 words
The combination as claimed in claim 2 in which the valve seats cooperating with a given spool are formed at the respective ends of a cylindrical insert having lateral openings formed therein.
Claim 5
Dependent Claim
38 words
The combination as claimed in claim 1 in which the housing means is unitary enclosing all of said chambers and seats and with means for guiding the movable valve members into seated condition with respect to the seats.
Claim 6
Dependent Claim
252 words
A safety valve assembly for supplying pressurized fluid from a supply line to a clutch and brake control line to energize the clutch and de-energize the brake and for alternatively exhausing the fluid from the control line to an exhaust line to de-energize the clutch and energize the brake, which comprises a first valve in the form of a double two-way valve having first and second valve seats defining a total of four ports, the seats being engaged by a valve member movable between limit positions for closing the seats alternatively, a second valve in the form of a three-way valve having third and fourth valve seats defining a total of three ports, the seats being engaged by a valve member movable between limit positions for closing the seats alternatively, separate actuating means for activating the valve members, means for interconnecting the ports associated with the first and third valve seats in series so that when the valve members are both activated, pressurized fluid is conducted in succession past the first and third valve seats, means for interconnecting the ports associated with the second and fourth valve seats in parallel so that when the valve members are both deactuated, exhausted fluid is conducted in parallel past the second and fourth valve seats and so that in the event one of the valve members, upon being deactuated, sticks in its activated position at least the second or fourth seat will remain open to provide direct escape of exhausted fluid from the control line.
Claim 7
Dependent Claim
252 words
A safety valve assembly for supplying pressurized fluid from a supply line to a clutch and brake control line to energize the clutch and de-energize the brake and for alternatively exhausing the fluid from the control line to an exhaust line to de-energize the clutch and energize the brake, which comprises a first valve in the form of a double two-way valve having first and second valve seats defining a total of four ports, the seats being engaged by a valve member movable between limit positions for closing the seats alternatively, a second valve in the form of a three-way valve having third and fourth valve seats defining a total of three ports, the seats being engaged by a valve member movable between limit positions for closing the seats alternatively, separate actuating means for activating the valve members, means for interconnecting the ports associated with the first and third valve seats in series so that when the valve members are both activated, pressurized fluid is conducted in succession past the first and third valve seats, means for interconnecting the ports associated with the second and fourth valve seats in parallel so that when the valve members are both deactuated, exhausted fluid is conducted in parallel past the second and fourth valve seats and so that in the event one of the valve members, upon being deactuated, sticks in its activated position at least the second or fourth seat will remain open to provide direct escape of exhausted fluid from the control line.
Claim 8
Dependent Claim
22 words
The combination as claimed in claim 5 in which means are provided for signalling the sticking of one of the valve members.
References Cited (Backward Citations)
US3603348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |