Patent US4243115A successfully refreshed from Google Patents.
US4243115A
Expired / Lapsed
US
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Draw bar unit
Assignee: Indresco Inc
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Filing: 1979-04-02
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Granted: 1981-01-06
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Expires: 1999-04-02
Abstract
Abstract A draw bar unit for connecting a recovery vehicle to a vehicle having a pressure fluid operated steering system of the stored energy kind in cases of failure of the normal pressurizing means of the system, incorporates auxiliary pressurizing means connectible into the pressure fluid circuit of the disabled vehicle and operable in response to relative movement between the vehicles to pressurize the pressure fluid circuit.
Inventors
- 👤 Christopher Wall
- 👤 Ronald Scaife
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:02
CPC Classifications
B; B60; B60D; B60D1/00; B60D1/58; B60D1/62; B62; B62D; B62D5/00; B62D5/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A draw bar unit for attaching a recovery vehicle to a vehicle having a pressure fluid operated steering system of the stored energy kind in cases of failure of the normal steering system pressurising means, said draw bar unit incorporating auxiliary pressurising means connectible into the pressure fluid circuit of the steering system of the disabled vehicle and operable in response to reciprocating movement of one of the vehicles towards and away from the other to pressurise said pressure fluid circuit by a pumping action.
Claim 2
Dependent Claim
85 words
A draw bar unit for attaching a recovery vehicle to a vehicle having a pressure fluid operated steering system of the stored energy kind in cases of failure of the normal steering system pressurising means, said draw bar unit incorporating auxiliary pressurising means connectible into the pressure fluid circuit of the steering system of the disabled vehicle and operable in response to reciprocating movement of one of the vehicles towards and away from the other to pressurise said pressure fluid circuit by a pumping action.
Claim 3
Dependent Claim
17 words
A unit as set forth in claim 1, in which the unit incorporates a piston and cylinder.
Claim 4
Dependent Claim
35 words
A unit as set forth in claim 2, in which the cylinder is provided with suction and delivery connections provided with suitably oriented check valves and both leading into a first chamber of the cylinder.
Claim 5
Dependent Claim
32 words
A unit as set forth in claim 3, in which the suction connection is also in communication with a second chamber on the opposite side of the piston to the first chamber.
Claim 6
Dependent Claim
45 words
A unit as set forth in claim 2, in which the cylinder is mounted in a housing through which a rod from the piston projects, the piston rod carrying a stop member between the end wall of the cylinder and a wall of the housing.
Claim 7
Dependent Claim
54 words
A unit as set forth in claim 5, in which the free end of the piston rod and a lug on the cylinder at the other end of the unit are each formed with an eye for connection to a clevis on the recovery vehicle or the disabled vehicle as the case may be.
References Cited (Backward Citations)
GB1283063A
Cited
US3635300A
Cited
US3719249A
Cited
GB1367557A
Cited
US4040507A
Cited
US4076096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |