# US 7,744,334 B2 · Gooseneck semi-trailer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,744,334 B2 - Document ID: US7744334B2 - Status: Granted - Kind: B2 - Application number: 11/604,231 - Filed: 2006-11-27 - Published: 2007-06-21 - Granted: 2010-06-29 - Earliest claimed: 2005-12-06 - Inventors: Bengt-Olof Hammar - Web page: https://patentgrep.com/patent/US7744334B2 ## CPC - B62D 21/20: trailer type, i.e. a frame specifically constructed for use in a non-powered vehicle - B60P 1/435: {the ramp being attached to or making part of the side- or tailboards of the vehicle} - B60P 1/6481: {Specially adapted for carrying different numbers of container or containers of different sizes} - 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) - B60P: VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS (vehicles with special provisions for transporting patients or disabled persons, or their personal conveyances A61G3/00) ## Abstract The present invention relates to a semi-trailer, comprising a gooseneck chassis and a container lifting device with at least one crane part displaceable along the chassis. The chassis comprises frame portions which are vertically displaced relative to each other, where the available vertical space for driving the displaceable crane part is limited particularly in the transition between said frame portions. The displacement of the crane part on one frame portion of the chassis takes place by means of a linearly operating, longitudinally variable elongate actuator, which both in the retracted and in the extended state is positioned substantially within the height limits of the chassis and has a substantially constant angle to the chassis. A vertically articulated link arm is at one end connected to a driving part of the actuator and at the other end articulated to said displaceable crane part. ## Claims ### Claim 1 A semi-trailer for transporting containers which are connected to a tractor unit, comprising a goose-neck chassis and a container lifting device with a forward crane part and a rearward crane part each of which are displaceable along the goose-neck chassis, the goose-neck chassis comprising two chassis portions positioned one behind the other, each having a top portion, whereby said top portions are positioned vertically displaced relative to each other, wherein one of the crane parts is connected to a linearly operating, longitudinally variable elongate actuator, and a displacement of the crane part connected to the elongate actuator takes place by means of the linearly operating, longitudinally variable elongate actuator, which both in a retracted and in an extended state is positioned substantially below said top portions and has a substantially constant angle to the goose-neck chassis, a vertically pivotable link arm being connected at one end to a driving part of the elongate actuator and at an other end pivotably connected to said crane part connected to the elongate actuator. ### Claim 2 (depends on 1) A semi-trailer as claimed in claim 1, wherein said end of the link arm which is connected to the elongate actuator slides with a slider along a guide, which is substantially parallel to the elongate actuator. ### Claim 3 (depends on 2) A semi-trailer as claimed in claim 2, wherein said guide includes two U sections with their openings facing each other, the slider extending into the U sections. ### Claim 4 (depends on 1) A semi-trailer as claimed in claim 1, wherein the link arm is vertically articulate at both ends. ### Claim 5 (depends on 1) A semi-trailer as claimed in claim 1, wherein said elongate actuator is a hydraulic cylinder assembly. ### Claim 6 (depends on 1) A semi-trailer as claimed in claim 1, wherein the driving part of the elongate actuator is connected to a slider which is connected to one end of the link arm. ### Claim 7 (depends on 1) A semi-trailer as claimed in claim 1, wherein said elongate actuator is angled to the horizontal plane. ### Claim 8 (depends on 1) A semi-trailer as claimed in claim 1, further comprising: a guide passing diagonally, at an angle to a horizontal plane, through the transition between said chassis portions. ### Claim 9 (depends on 1) A semi-trailer as claimed in claim 1, wherein said link arm is a spacer between the driving part of the elongate actuator and said displaceable crane part. ### Claim 10 A semi-trailer comprising: a goose-neck chassis including, a front portion with a first top surface, a rear portion with a second top surface lower than the first top surface, and a transition portion between the front portion and the rear portion, the transition portion connecting the front portion to the rear portion; a crane including a movable front crane configured to move along the front portion, and a movable rear crane configured to move along the rear portion; and a linear actuator connected to the movable front crane and the rear portion of the chassis, the linear actuator configured to move the movable front crane along the first top surface.