Material or article handling – Self-loading or unloading vehicles – Separable load rack
Patent
1991-10-23
1992-12-22
Werner, Frank E.
Material or article handling
Self-loading or unloading vehicles
Separable load rack
414495, 414480, 414475, 414483, 414346, 2804252, 2804411, 2804412, B60P 116
Patent
active
051730286
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the semitrailer defined in the introductory section of patent claim 1.
In the prior art there is known, from the patent publications FI 77,187 and U.S. Pat. No. 3,303,950 a trailer, which is at the front end directly attached to the tractor At the loading and unloading stages, the support legs provided at the rear end of the trailer are lowered to the ground, and the rear bogie of the trailer is shifted to the front end thereof, near the tractor. Thereafter the rear end of the trailer is lowered down to the ground by the aid of the support legs. The trailer is then ready to be loaded or unloaded.
A problem with the described trailer is that the wheels of the rear bogie must be of small size. On this condition the rear end of the trailer can be lowered against the ground while loading and unloading the trailer. Ordinary rear bogie arrangements can thus not be applied to this trailer. Owing to the small size of the rear bogie, its load bearing capacity also is weaker than normal.
From the U.S. Pat. No. publication 3,606,059 there is known a trailer which also is attached directly to the tractor at its front end. The trailer comprises two turnably interconnected members: the trailer proper and an auxiliary frame, whereby the trailer proper and the tractor are connected to each other. For loading or unloading, the wheel bogie is shifted from the rear end of the trailer to its front end, under the auxiliary frame, whereafter the trailer proper can be turned, at its articulation, so that its rear end rests against the ground.
A problem with the said trailer is its two-part structure; it is heavy in structure and expensive in production. Another problem is that the inclination angle of the trailer while loading and unloading becomes large and may cause trouble in handling the load. Yet another problem is that such a trailer is suitable only for handling comparatively short loads or pallets.
From the Finnish patent publication FI 57,718 there is known a trailer which is at its front end directly attached to the tractor. While loading and unloading the trailer, the bogies are shifted from the rear end of the trailer to its front end, and the tractor is pulled, by means of the bogie, from under the trailer. Thus the trailer remains in the support of the rear bogie at its front end.
A problem with the described trailer is that the tractor must be provided with special auxiliary devices which disengage the tractor from the trailer during the final stage of the shifting of the rear bogie. Another problem is that the shifting of the trailer in situations when the trailer is in the loading or unloading position, with its rear lowered down, is troublesome.
From the U.S. Pat. No. publication 4,746,261 there is known a trailer where during loading and unloading, the rear bogie is shifted, from its normal rear position, halfway towards the front, whereafter the rear end of the trailer is turned against the ground by means of a hauling device. The said device is a hydraulic cylinder provided in connection with the front end of the trailer and the coupling members of the tractor. The trailer is loaded by pulling the load to the support of the trailer by means of a pulling device, which is connected to the front end of the trailer.
A problem with the above described trailer is that it is suitable for handling only such loads which are lifted from the ground to the trailer, or lowered to the ground from the trailer. Moreover, any unevenness or softness in the ground or other underlaying surface causes trouble.
The object of the present invention is to eliminate the above mentioned drawbacks.
The semitrailer of the invention is characterized by the novel features enlisted in the patent claim 1.
The semitrailer of the invention comprises means for shifting the load, such as a container, to the support of the trailer, and away from the support thereof, as well as means for shifting the bogie in the lengthwise direction of the trailer. It is characteristic of the invention that the semitrailer is provided wi
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patent: 3719392 (1973-03-01), Russell
patent: 4051968 (1977-10-01), Massey
patent: 4746261 (1988-05-01), Landoll et al.
patent: 5000645 (1991-03-01), Polojarvi
Heikkinen Jaakko
Huttunen Markku
Moilanen Pentti
Rautaruukki Oy
Werner Frank E.
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