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US 4,061,353 AGranted
Transport lock for lift bed trailer
AssigneeEugene A. LeBoeuf
InventorsStephen A. Kingman, Leslie A. Weaver
Life of this patent
Estimating the term…
Abstract
A lift bed highway trailer adapted to be coupled to a tractor to transport heavy loads through use of pallet frame units that can be quickly picked up and discharged at any point, including an improved power actuated mechanism in the trailer gooseneck structure and in the suspension subframe for positively locking the liftable bed in the raised transport position.
Claims15
In a lift bed highway trailer adapted for coupling to a tractor by means of a fifth wheel connection;
- the combination comprising:
- a. a liftable main frame having a lowered loading and unloading position and a raised transport position;
- b. a wheeled subframe underlying said main frame and pivotally connected to the same;
- c. a gooseneck fixed to the forward end of said main frame;
- d. a jackbox mounted within said gooseneck for vertical sliding movement relative thereto, said jackbox being adapted for attachment to the tractor fifth wheel;
- e. power lift means for moving said main frame and gooseneck between the lowered loading and unloading position and the raised transport position;
- f. a pair of lift spacers including linear guides mounted on said subframe for lateral sliding movement but constrained against longitudinal movement relative thereto;
- g. power actuator means for extending said lift spacers laterally against a positive stop to support said main frame in an elevated position;
- and
- h. a pair of power actuated shot pins mounted in said jackbox in axially spaced relation with each other adapted respectively to engage said gooseneck and lock same in the raised transport position.
7 more elements
In a highway trailer of the lift bed type adapted to be coupled to a tractor, the combination comprising:
- a. a liftable main frame having a lowered loading and unloading position and a raised transport position;
- b. a loaded pallet frame unit adapted to straddle said main frame;
- c. a subframe underlying said main frame and pivotally connected to same;
- d. a wheeled suspension underlying said subframe and adapted to serve as a ground support therefor;
- e. a gooseneck fixed to the forward end of said main frame and having a pair of longitudinal structural members and a pair of transverse structural members defining a jackbox opening therebetween;
- f. a jackbox mounted within said opening for vertical sliding movement relative to said gooseneck, said jackbox being adapted for attachment to the tractor fifth wheel;
- g. power lift means for moving said main frame and gooseneck between the lowered loading and unloading position and the raised transport position;
- h. a pair of lift spacers including linear guides mounted on said subframe for lateral sliding movement but constrained against longitudinal movement relative thereto;
- i. power actuator means for extending said lift spacers laterally against a positive stop to support said main frame in an elevated position;
- and
- j. a pair of power actuated shot pins mounted in said jackbox in axially spaced relation with each other adapted to be projected outwardly therefrom in opposite directions to engage said gooseneck transverse members and positively lock said gooseneck in raised transport position.
8 more elements
In a lift bed highway trailer adapted for coupling to a tractor by means of a fifth wheel connection;
- the combination comprising:
- a. a liftable main frame having a lowered loading and unloading position and a raised transport position;
- b. a wheeled subframe underlying said main frame and pivotally connected to the same;
- c. a gooseneck fixed to the forward end of said main frame;
- d. a jackbox mounted within said gooseneck for vertical sliding movement relative thereto, said jackbox being adapted for attachment to the tractor fifth wheel;
- e. power lift means for moving said main frame and gooseneck between the lowered loading and unloading position and the raised transport position;
- and
- f. a pair of power actuated shot pins disposed in the longitudinal center plane of the trailer, said shot pins being mounted in said jackbox in axially spaced relation with each other adapted respectively to engage said gooseneck and lock same in the raised transport position.
5 more elements
In a highway trailer of the lift bed type adapted to be coupled to a tractor, the combination comprising:
- a. a liftable main frame having a lowered loading and unloading position and a raised transport position;
- b. a loaded pallet frame unit adapted to straddle said main frame;
- c. a subframe underlying said main frame and pivotally connected to same;
- d. a wheeled suspension underlying said subframe and adapted to serve as a ground support therefor;
- e. a gooseneck fixed to the forward end of said main frame and having a pair of longitudinal structural members and a pair of transverse structural members defining a jackbox opening therebetween;
- f. a jackbox mounted within said opening for vertical sliding movement relative to said gooseneck, said jackbox being adapted for attachment to the tractor fifth wheel;
- g. power lift means for moving said main frame and gooseneck between the lowered loading and unloading position and the raised transport position;
- and
- h. a pair of power actuated shot pins mounted in said jackbox in axially spaced relation with each other adapted to be projected outwardly therefrom in opposite directions to engage said gooseneck structural members and positively lock said gooseneck in raised transport position.
6 more elements
In a highway trailer of the lift bed type adapted to be coupled to a tractor, the combination comprising:
- a. a liftable main frame having a lowered loading and unloading position and a raised transport position;
- b. a loaded pallet frame unit adapted to straddle said main frame;
- c. a subframe underlying said main frame and pivotally connected to same;
- d. a wheeled suspension underlying said subframe and adapted to serve as a ground support therefor;
- e. a gooseneck fixed to the forward end of said main frame and having a pair of longitudinal structural members and a pair of transverse structural members defining a jackbox opening therebetween;
- f. a jackbox mounted within said opening for vertical sliding movement relative to said gooseneck, said jackbox being adapted for attachment to the tractor fifth wheel;
- g. power lift means for moving said main frame and gooseneck between the lowered loading and unloading position and the raised transport position;
- h. a pair of lift spacers mounted on said subframe for lateral sliding movement between an inboard or retracted position and an outboard or extended position;
- i. a pair of opposed linear guide shoes fixed to each said lift spacer and engaging said subframe, said guide shoes permitting lateral sliding movement of said lift spacer but precluding longitudinal movement thereof;
- and
- j. power actuator means for extending said lift spacers laterally against a positive stop to support said main frame in an elevated position.
8 more elements
In a lift bed highway trailer adapted for coupling to a tractor by means of a fifth wheel connection;
- the combination comprising:
- a. a liftable main frame having a lowered loading and unloading position and a raised transport position;
- b. a wheeled subframe underlying said main frame and pivotally connected to the same;
- c. a gooseneck fixed to the forward end of said main frame;
- d. a jackbox mounted within said gooseneck for vertical sliding movement relative thereto, said jackbox being adapted for attachment to the tractor fifth wheel;
- e. power lift means for moving said main frame and gooseneck between the lowered loading and unloading position and the raised transport position;
- f. a pair of lift spacers mounted on said subframe for lateral sliding movement between an inboard or retracted position and an outboard or extended position;
- g. a pair of opposed linear guide shoes fixed to each said lift spacer and engaging said subframe, said guide shoes permitting lateral sliding movement of said lift spacer but precluding longitudinal movement thereof;
- and
- h. power actuator means for extending said lift spacers laterally against a positive stop on said subframe to support said main frame in raised transport position.
7 more elements
In a highway trailer of the lift bed type adapted to be coupled to a tractor, the combination comprising:
- a. a liftable main frame movable between a lowered position and an elevated position;
- b. a gooseneck fixed to the forward end of said main frame having a pair of longitudinal structural members and a pair of transverse structural members defining a jackbox opening therebetween;
- c. a first pair of bushings mounted in the jackbox opening and secured to respective ones of said structural members;
- d. a jackbox mounted within said opening for vertical sliding movement relative to said gooseneck, said jackbox being adapted for attachment to the tractor fifth wheel;
- e. power lift means for moving said main frame and gooseneck between the lowered position and the elevated position;
- f. a second pair of bushings mounted in said jackbox and situated for registration with said first pair of bushings when said liftable main frame is in the elevated position;
- g. a pair of shot pins slidably mounted in respective ones of said jackbox bushings;
- h. a pair of rocker arms pivotally connected to respective ones of said shot pins;
- i. a pair of biasing springs each connected between one said rocker arm and the jackbox and adapted to urge their associated shot pins outwardly;
- and
- j. a pair of power actuators mounted within said jackbox and connected to respective ones of said rocker arms in opposition to said biasing springs, said actuators when energized being adapted to withdraw said shot pins into the jackbox.
8 more elements
Dependencies are inferred from the claim text.