Extendable trailer apparatus

• US 4,958,845 A
• Filed: 06/19/1989
• Issued: 09/25/1990
• Est. Priority Date: 09/16/1988
• Status: Expired due to Fees

• Current Assignee: Parks, Donald J.
• Original Assignee: Parks, Donald J.
• Inventors: Parks, Donald J.
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): Johnson, Brian L.
• Application Number:
  US07/355,493
• Time in Patent Office: 463 Days
• Field of Search: 280/404, 280/405.1, 280/407, 280/407.1, 280/408, 280/81.1, 280/149.2, 280/837, 296/15, 296/184, 298/7, 298/22 R, 298/29, 298/30, 298/1 A
• US Class Current: 280/407.1
• CPC Class Codes: B62D 53/067 Multi-purpose, convertible or extendable load surface semi-trailers for container transport B60P1/6418; convertible road transport vehicles in general B60P3/42
• CPC Class Codes: B62D 53/068 having devices to equalise or modify the load between the fifth wheel and the rear wheels adjustable couping saddles per se B62D53/0807; load transfer devices to permit coupling or uncoupling B62D53/0857; anti jack-knifing devices B62D53/0871

Abstract

Extendable trailer apparatus includes a fixed frame and a frame slidably connected to the fixed frame and movable relative to the fixed frame for lengthening and shortening the trailer apparatus. The movable rear frame includes an axle and wheels secured to it, and a load is secured to the fixed frame. The two frames are movable for adjusting the weight of the load on trailer axles including axles secured to the fixed portion of the trailer and an axle or axles secured to the movable frame. One embodiment of the apparatus includes an end dump bed with tapered sides and a sloping bottom for enhancing the dumping capabilities.

Claims

1. Extendable trailer apparatus, comprising in combination:

first frame means for supporting a load to be hauled having a first overall length, including

bed means on which the load is disposed,

first beam means secured to the bed means for supporting the bed means and the load, and

second beam means spaced apart from and disposed generally parallel to the first beam means and secured to the bed means for supporting the bed means and the load with the first beam means;

second frame means movable relative to the first frame means between an open and a closed position, including

third beam means having a first full length and disposed adjacent to the first beam means for movement relative to the first beam means,

fourth beam means having a second full length and disposed adjacent to the second beam means for movement relative to the second beam means,

slider means secured to the third and fourth beam means and extending substantially the first and second full lengths of the third and fourth beam means for guiding the first and third beam means and the second and fourth beam means as the third and fourth beam means move relative to the first and second beam means and on which the first and second beam means are disposed, wherein the first frame means further includes first slide bar means secured to the first and second beam means and slidable on the third and fourth beam means as the first and second frame means move relative to each other between the open and closed positions and the first and third beam means includes webs with which the first slide bar means is aligned, and

wheel and axle means operatively secured to the third and fourth beam means for supporting the first and second frame means; and

locking means for securing the first and second frame means together.

2. The apparatus of claim 1 in which the first frame means includes stop means for stopping the relative movement of the first and second frame means in the open and closed positions.

3. The apparatus of claim 1 in which the first and second beam means each include respectively a first flange and a second flange, and the third and fourth beam means each include respectively a third flange and a fourth flange disposed respectively adjacent to the first and second flanges.

4. The apparatus of claim 3 in which the first slide bar means secured to the first and second beam means includes a first slide bar secured to the first flange, and slidable on the third flange, and a second slide bar secured to the second flange and slidable on the fourth flange.

5. The apparatus of claim 4 in which the slider means of the second frame means further includes first slide means secured to the third and fourth beam means and slidable on the first and second flanges of the first and second beam means.

6. The apparatus of claim 5 in which the first slide means includes a first slide element secured to the third flange and receiving a portion of the first flange, and a second slide element secured to the fourth flange and receiving a portion of the second flange.

7. The apparatus of claim 1 in which the bed means includes:

a front side having a first width,

a tail gate remote from the front side and having a second width which is wider than the first width,

side means extending from the front side of the tail gate, including portions tapering inwardly between the tail gate and the front side, and

bottom means extending from the front side to the tail gate, including a downwardly tapering portion extending rearwardly from the front side to provide a sloping first bottom portion.

8. The apparatus of claim 7 in which the bottom means further includes a generally horizontally disposed second bottom portion extending from the sloping first bottom portion to the tail gate.

9. The apparatus of claim 8 in which the bottom means includes means for pivoting the bed means relative to the first frame means for dumping the load.

10. The apparatus of claim 8 in which the side means includes means for pivoting the tail gate.

11. The apparatus of claim 1 in which the locking means includes

pin means, including a pin movable between a lock position and an unlock position to respectively lock and unlock the first and second frame means, and

aperture means, including a first aperture for receiving the pin of the pin means to lock the first and second frame means in the open position and a second aperture for receiving the pin of the pin means to lock the first and second frame means in the closed position.

12. The apparatus of claim 1 in which the first and second beam means include flanges disposed and movable within the slider means.

13. The apparatus of claim 12 in which the first and second slide bars extend along the third and fourth beam means, and the slider means, the first and second beam means, and the third and fourth beam means cooperate to define enclosures for the first and second slide bars and the flanges disposed within the slider means for preventing the entrance of undesirable elements and for retaining a lubricant for the slider means and the slide bars.