Patent US4943870A successfully refreshed from Google Patents.
Patent US3591203A successfully refreshed from Google Patents.
US3591203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic automatic steering arrangement for pulled vehicles
Assignee: Bergische Achsen Kotz Soehne
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Filing: 1969-05-01
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Granted: 1971-07-06
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Expires: 1989-05-01
Abstract
Abstract A steering system for steerable rear wheels of a trailer vehicle in which receiving fluid motors are connected to the said rear wheels to cause turning thereof while a sending piston cylinder arrangement is connected in circuit with the fluid motors. The piston is engaged by a cam to move the piston in the cylinder to displace fluid to and from the fluid motors and one of the cylinder and cam is fixed to the trailer frame while the other thereof is fixed to a member pivoted to the trailer frame which is adapted for connection to a towing vehicle so as to turn with the towing vehicle.
Inventors
- 👤 Helmut Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:36
CPC Classifications
B; B62; B62D; B62D13/00; B62D13/02; B62D13/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
240 words
A steering device for a trailer vehicle: said vehicle having a frame with steerable rear wheels and a turntable at the front, said turntable comprising a fiRst member fixed to the vehicle frame and a second member pivoted to the first member and adapted to be fixed to a towing vehicle so that when the towing vehicle turns the said second member will turn relative to said first member, fluid-operable receiving piston cylinder means connected between said frame and said rear wheels for causing steering movements of the said rear wheels in response to a supply of fluid to said receiving piston cylinder means, sending piston cylinder means connected in circuit with said receiving piston cylinder means and having a cylinder means connected to one of said first and second members and also having piston means, and cam means connected to the other of said first and second members having a cam surface engaging said piston means and operable to displace said piston means in said cylinder means in response to relative rotation of said first and second members whereby turning of said towing vehicle will be accompanied by steering movement of the said rear wheels of the trailer vehicle, said piston means being double ended and said cam surface presenting a closed endless path engaging both ends of said piston means for positive actuation of the said piston means in both directions of movement thereof in said cylinder means.
Claim 2
Dependent Claim
240 words
A steering device for a trailer vehicle: said vehicle having a frame with steerable rear wheels and a turntable at the front, said turntable comprising a fiRst member fixed to the vehicle frame and a second member pivoted to the first member and adapted to be fixed to a towing vehicle so that when the towing vehicle turns the said second member will turn relative to said first member, fluid-operable receiving piston cylinder means connected between said frame and said rear wheels for causing steering movements of the said rear wheels in response to a supply of fluid to said receiving piston cylinder means, sending piston cylinder means connected in circuit with said receiving piston cylinder means and having a cylinder means connected to one of said first and second members and also having piston means, and cam means connected to the other of said first and second members having a cam surface engaging said piston means and operable to displace said piston means in said cylinder means in response to relative rotation of said first and second members whereby turning of said towing vehicle will be accompanied by steering movement of the said rear wheels of the trailer vehicle, said piston means being double ended and said cam surface presenting a closed endless path engaging both ends of said piston means for positive actuation of the said piston means in both directions of movement thereof in said cylinder means.
Claim 3
Dependent Claim
51 words
A steering device according to claim 1, in which said cam surface has two diametrally opposed circular arc regions of respectively different radii and of the same angular extent, and two stroke regions connecting said arc regions at their adjacent ends and in the form of mirror images of each other.
Claim 4
Dependent Claim
29 words
A steering device according to claim 2, in which said stroke regions each extend over about 80* of the circumference of the cam surface measured as a central angle.
Claim 5
Dependent Claim
33 words
A steering device according to claim 1, in which said sending piston cylinder means is double acting and has each end thereof connected to a respective one of said receiving piston cylinder means.
Claim 6
Dependent Claim
34 words
A steering device according to claim 4, in which each receiving piston cylinder means is single acting and is connected by a single conduit with the pertaining end of said sending piston cylinder means.
Claim 7
Dependent Claim
47 words
A steering device according to claim 5, in which said receiving piston cylinder means and said transmitting piston cylinder means are so interconnected that turning of the towing vehicle in one direction results in turning of said rear wheels of the trailer vehicle in the opposite direction.
Claim 8
Dependent Claim
22 words
A steering device according to claim 1, which includes a roller on each end of said piston means engaging said cam surface.
Claim 9
Dependent Claim
78 words
A steering device according to claim 1, in which said first and second members form a part of a saddle coupling comprising a coupling plate, a sliding plate, a follower part and a kingpin, said cylinder means and said kingpin being connected to said sliding plate with the axis of the kingpin which forms the axis of which the towing vehicle turns relative to the trailer vehicle passing through the midpoint of the axis of said cylinder means.
Claim 10
Dependent Claim
28 words
A steering device according to claim 8, in which said sliding plate forms said second member, and antifriction means connecting said sliding plate to the said first member.
Claim 11
Dependent Claim
30 words
A steering device according to claim 9, in which a common holding plate is provided connecting said first member and said cam means to the frame of said trailer vehicle.
Claim 12
Dependent Claim
32 words
A steering device according to claim 1, in which the ratio of the size of the sending piston cylinder means relative to that of the receiving piston cylinder means is about 2:1.
Claim 13
Dependent Claim
64 words
A steering device according to claim 1, in which said trailer vehicle is provided with a drawbar for connection to a towing vehicle, said drawbar being connected to said second member, said first member being connected to the frame of the trailer vehicle, said sending piston cylinder means being connected to said second member and said cam means being connected to said first member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |