Patent US3690733A successfully refreshed from Google Patents.
US3690733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressed-air braking and locking system for trailers or semitrailers
Assignee: Individual
•
Filing: 1970-12-07
•
Granted: 1972-09-12
•
Expires: 1990-12-07
Abstract
Abstract A compressed-air braking and brakes locking system for trailers is provided, which permits to release the trailer brakes and to apply and lock the trailer brakes again when the trailer is separated from its tractor. The system includes a compressed air reservoir and an emergency relay valve on the trailer and a hand operated valve so arranged to put the control inlets of the emergency relay valve and of the brake unlocking device selectively in communication with the control circuits of the tractor or with the reservoir of the trailer.
Inventors
- 👤 Jean Gachot
- 👤 Fernand Perales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:47
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/04; B60T15/041; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/40; B60T13/403
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
258 words
A compressed-air braking and locking system for trailers or semitrailers which comprises at least one brake cylinder, airactuated elements for locking the brakes comprising a locking control inlet and an unlocking control inlet, an emergency relay valve having an outlet connected to the brake cylinder and to the locking elements, a feed inlet connected to a compressed-air reservoir and a first and a second control inlet, said relay valve being adapted to put its feed inlet into communication with its outlet when an air pressure is applied to the first control inlet or when the second control inlet is connected to atmospheric pressure, the system being further provided with a first and a second coupling adapted to be connected respectively to a direct-control fluid circuit and to an automatic-control fluid circuit of a tractor vehicle, said system comprising a hand-operated vAlve unit having at least two positions and at least one two-way valve which are so arranged that in a first position the first and second control inlets of the emergency relay valve are put into communication respectively with the first and the second couplings in order to cut-off the communication between the reservoir and said first and second control inlets and that in a second position the reservoir is put into communication with the unlocking control inlet, the first and second couplings being at atmospheric pressure, the handoperated valve unit having a third position and being so arranged that in said third position the reservoir is connected to the second control inlet of the emergency relay valve.
Claim 2
Dependent Claim
258 words
A compressed-air braking and locking system for trailers or semitrailers which comprises at least one brake cylinder, airactuated elements for locking the brakes comprising a locking control inlet and an unlocking control inlet, an emergency relay valve having an outlet connected to the brake cylinder and to the locking elements, a feed inlet connected to a compressed-air reservoir and a first and a second control inlet, said relay valve being adapted to put its feed inlet into communication with its outlet when an air pressure is applied to the first control inlet or when the second control inlet is connected to atmospheric pressure, the system being further provided with a first and a second coupling adapted to be connected respectively to a direct-control fluid circuit and to an automatic-control fluid circuit of a tractor vehicle, said system comprising a hand-operated vAlve unit having at least two positions and at least one two-way valve which are so arranged that in a first position the first and second control inlets of the emergency relay valve are put into communication respectively with the first and the second couplings in order to cut-off the communication between the reservoir and said first and second control inlets and that in a second position the reservoir is put into communication with the unlocking control inlet, the first and second couplings being at atmospheric pressure, the handoperated valve unit having a third position and being so arranged that in said third position the reservoir is connected to the second control inlet of the emergency relay valve.
Claim 3
Dependent Claim
162 words
A system according to claim 1, wherein the brake cylinder has a main braking control inlet and an emergency braking control inlet, wherein the valve unit is so arranged that in the second position thereof the reservoir is put into communication with the first and the second control inlets of the emergency relay valve and that the two-way valve is a reversing valve having a control inlet connected to the second control inlet of the emergency relay valve, a feed inlet connected to the outlet of the emergency relay valve, a first outlet connected to the main braking control inlet and to the unlocking control inlet and a second outlet connected to the emergency braking control inlet and to the locking control inlet, said reversing valve being adapted in a manner known per se to put its feed inlet into communication respectively with its first or second outlet according as its control inlet is put under pressure or connected to the atmosphere.
Claim 4
Dependent Claim
180 words
A system according to claim 2, wherein the valve unit has a first and a second valve and a manually operated mechanism, the first valve having a first inlet connected to the first coupling and a second inlet connected to the reservoir, an outlet connected to the first control inlet of the emergency relay valve and a two-position movable shutter, the second valve having a first inlet connected to the second coupling, a second inlet connected to the reservoir, an outlet connected to the second control inlet of the emergency relay valve, and a three-position movable shutter and the actuating mechanism being so arranged that in a first position the first inlet of each valve is put into communication with the corresponding outlet and that in a second position the second inlet of each valve is put into communication with the corresponding outlet and that in a third position the first inlet of the first valve is put into communication with the corresponding outlet and the second inlet of the second valve is put into communication with the corresponding outlet.
Claim 5
Dependent Claim
124 words
A system according to claim 3, wherein each valve of the valve unit comprises a substantially cylindrical chamber into which open the first inlet which is disposed in the axis of the chamber and the outlet which is disposed in the axis of the chamber and the outlet which is disposed laterally, a bore which is located in coaxial relation with said chamber in the line of extension thereof and into which the second inlet opens laterally, and an obturator which is constituted by a plunger fitted with a restoring spring and having a diameter substantially equal to that of the bore and which has a portion of smaller cross-sectional area in the central portion thereof which defines an annular chamber within the bore.
Claim 6
Dependent Claim
46 words
A system according to claim 4, wherein the first valve of the valve unit comprises a stop which is adapted to limit the travel of the plunger so that said plunger should come into contact with the actuating mechanism only in the second and third positions.
Claim 7
Dependent Claim
137 words
A system according to claim 1, wherein the dimensions of the locking and unlocking control elements are such that the action of the unlocking control elements is preponderant over the action of the locking control elements when the same air pressure is applied simultaneously to the locking and unlocking conTrol inlets, wherein the outlet of the emergency relay valve is connected to the braking control inlet of the brake cylinder and to the locking control inlet and the unlocking control inlet is connected to the first control inlet of the emergency relay valve, and wherein the valve unit is adapted to put the reservoir into communication with the two control inlets of the emergency relay valve in the second position thereof and with the second control inlet of said emergency relay valve in the third position thereof.
Claim 8
Dependent Claim
54 words
A system according to claim 6, wherein said system comprises a retarding valve which is mounted between the unlocking control inlet and the first control inlet of the emergency relay valve, said retarding valve being adapted to slow-down the air flow solely in one direction from the unlocking elements to the emergency relay valve.
Claim 9
Dependent Claim
97 words
A system according to claim 6, wherein the valve unit comprises two valves each having an inlet connected to the compressed-air reservoir, an outlet connected respectively to the first and to the second control inlets of the emergency relay valve and a movable shutter, and wherein said valve unit comprises a single manual-control mechanism for actuating said two shutters, said mechanism being provided with three positions corresponding respectively to closure of the two shutters, to opening of the shutter corresponding to the second control inlet of the emergency relay valve and to opening of the two shutters.
Claim 10
Dependent Claim
63 words
A system according to claim 6, wherein said system comprises two double stop valves whose outlets are connected respectively to the first and to the second control inlets of the emergency relay valve and having a first inlet connected respectively to the couplings of the direct-control and automatic-control circuits and a second inlet connected respectively to the valve outlets of the valve unit.
Claim 11
Dependent Claim
71 words
A system according to claim 7, wherein the retarding valve comprises a chamber into which open a first port connected to the unlocking control inlet and a second port connected to the first control inlet of the emergency relay valve, and a movable shutter pierced by a small-section passageway and adapted to be applied against the second port when the air flows from the locking elements towards the emergency relay valve.
Claim 12
Dependent Claim
79 words
A system according to claim 6, wherein said system comprises a pipe fitted with a stop valve connected on one side to the feed inlet of the emergency relay valve and on the other side to a flexible hose which is intended to be connected to an auxiliary compressed-air reservoir and wherein a check valve which prevents the flow of air towards the compressed-air reservoir is mounted in the pipe which is connected to the outlet of said reservoir.
Claim 13
Dependent Claim
49 words
A system according to claim 6, wherein said system comprises a pipe for connecting the second coupling aforesaid to the outlet of the compressed-air reservoir and wherein a check valve is placed in said pipe for preventing the flow of air from the compressed-air reservoir to said second coupling.
Claim 14
Dependent Claim
120 words
A system according to claim 1, wherein the dimensions of the locking and unlocking control elements are such that the action of the unlocking control elements is preponderant over the action of the locking control elements when the same air pressure is applied simultaneously to the locking and unlocking control inlets, wherein the brake-unlocking control inlet is connected to the outlet of a double stop valve having two inlets of which a first inlet is connected to the first control inlet of the emergency relay valve and wherein the valve-unit is adapted to put the compressed-air reservoir into communication simultaneously with the second inlet of the double stop valve and with the second control inlet of the emergency relay valve.
Claim 15
Dependent Claim
55 words
A system according to claim 13, wherein the second control inlet of the emergency relay valve is connected to the outlet of a second double stop valve having two inlets such that the first inlet is connected to thE second coupling aforesaid and the second inlet is connected to the outlet of the valve unit.
Claim 16
Dependent Claim
39 words
A system according to claim 14, wherein the second inlet of the second stop valve has a flow cross-section of smaller area than either the first inlet of said valve or the inlets of the first double stop valve.
Claim 17
Dependent Claim
100 words
A system according to claim 14, wherein the valve unit has a cylindrical tubular body into which open an admission port connected to the compressed-air reservoir and a discharge port and within which is slidably mounted a movable obturator having two positions, said obturator being constituted by a cylindrical plunger having annular channels separated by annular seals and adapted to put the admission port into communication with the discharge port in the first position of the obturator and to isolate the admission port and put the discharge port into communication with the atmosphere in the second position of the obturator.
Claim 18
Dependent Claim
196 words
A system according to claim 1, wherein the dimensions of the locking and unlocking control elements are such that the action of the unlocking control elements is preponderant over the action of the locking control elements when the same air pressure is applied simultaneously to the locking and unlocking control inlets, wherein the valve unit has an inlet connected to the reservoir as well as an outlet and an obturator which is adapted to put said inlet into communication with said outlet, wherein the unlocking control inlet is connected to the outlet of a double stop valve such that a first valve inlet is connected to the second coupling aforesaid and the second inlet is connected to the outlet of the valve unit, wherein the second control inlet of the emergency relay valve is connected to the outlet of a second double stop valve such that a first valve inlet is connected to the second coupling aforesaid and the second inlet is connected to the outlet of the valve unit and wherein the two inlets of said second double stop valve have a cross-section of smaller area than the inlets of the first double stop valve.
Claim 19
Dependent Claim
24 words
A system according to claim 1, wherein the valve unit comprises means for returning the mechanism automatically from the second to the third position.
Claim 20
Dependent Claim
54 words
A system according to claim 1, wherein said hand-operated valve unit comprises a cylinder connected to the second coupling and a piston which is capable of moving within said cylinder and carries a stem so arranged as to return the mechanism to the first position thereof when said second coupling is put under pressure.
References Cited (Backward Citations)
US3085833A
Cited
US3304131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |