# US 4,391,455 A · Tractor vehicle provided with a fifth-wheel plate

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- Number: US 4,391,455 A
- Document ID: US4391455A
- Status: Granted
- Kind: A
- Application number: 06/210,444
- Filed: 1980-11-25
- Granted: 1983-07-05
- Earliest claimed: 1979-12-14
- Assignees: OY Sisu-Auto AB
- Inventors: Nils Fagerstedt
- Web page: https://patentgrep.com/patent/US4391455A

## CPC

- B62D 49/007: {Tractors for handling trailers, e.g. roll-trailers in terminals}
- Y10S 280/14: Tractor-trailer backing connections
- B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A tractor vehicle provided with a fifth-wheel plate (4) supported by a beam (3) mounted on the chassis of the vehicle vertically pivotably in the longitudinal direction of the vehicle on two fulcrums (5) spaced-apart in the transverse direction of the vehicle. The fulcrums of the beam are selectively together or separately displaceable in the longitudinal direction of said vehicle. In this way the fifth-wheel plate is displaceable not only in the longitudinal direction (A) of the chassis by displacing both fulcrums simultaneously but also in the transverse direction (B) of the chassis by displacing only one fulcrum (FIG. 4).

## Claims

### Claim 1

A tractor vehicle provided with a fifth-wheel plate, comprising a chassis, a beam mounted on said chassis vertically pivotably on two fulcrums spaced-apart in the transverse direction of said vehicle, and a fifth-wheel plate supported by said beam, in which the improvement comprises said fulcrums of said beam being independently displaceable in the longitudinal direction of said vehicle.

### Claim 2 (depends on 1)

A vehicle as claimed in claim 1, wherein each fulcrum comprises a movable pivot pin to which said beam is mounted each movable pivot pin extending in the transverse direction of said vehicle and being supported with respect to said chassis displaceably in the longitudinal direction of said vehicle.

### Claim 3 (depends on 2)

A vehicle as claimed in claim 2, wherein said movable pivot pins are supported by levers pivotable about transverse fixed pivot pins supported by said chassis.

### Claim 4 (depends on 3)

A vehicle as claimed in claim 3, wherein each lever is connected to a power means, said power means being supported by said chassis, said power means being for pivoting said levers on said fixed pivot pins in a vertical plane extending in the longitudinal direction of said vehicle.

### Claim 5 (depends on 2)

A vehicle as claimed in claim 2, wherein said movable pivot pins are supported by slides displaceable in the longitudinal direction of the vehicle on guides supported by said chassis.

### Claim 6 (depends on 5)

A vehicle as claimed in claim 5, wherein each slide is connected to said power means, said power means being for displacing said slide along said guides.

### Claim 7 (depends on 4, 6)

A vehicle as claimed in claim 4 or 6, wherein said power means is adapted to displace said fulcrums together or separately in the same direction or in opposite directions.

### Claim 8 (depends on 2)

A vehicle as claimed in claim 2, wherein said movable pivot pins are coaxial in a retracted position and protruding position, of said levers.

### Claim 9 (depends on 3)

A vehicle as claimed in claim 3, wherein said fixed pivot pins are coaxial.