Land vehicles – Wheeled – Running gear
Reexamination Certificate
1998-10-19
2001-05-29
Dickson, Paul N. (Department: 3618)
Land vehicles
Wheeled
Running gear
C180S900000, C296S204000, C056S015900, C056SDIG002
Reexamination Certificate
active
06237957
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a tractor having reinforcing frames.
2. Description of the Related Art
A small or medium size tractor is designed basically for engaging in operations with a working implement such as a rotary plow connected to the rear of a tractor body. It is sometimes desired today to attach a front loader or a mid-mount mower to achieve an increased range of operation. For attaching a front loader, however, the tractor body must be reinforced since the tractor body undergoes loads different from those encountered in ordinary operations. As disclosed in Japanese Utility Model Laying-Open Publications S61-37086 and S63-156240, for example, a tractor body is reinforced by connecting reinforcing frames extending longitudinally thereof. A front loader is attached to the reinforce frames.
The body strength may be increased by connecting the reinforcing frames extending longitudinally of the tractor body. Thus, the tractor body can fully withstand loads acting thereon during operations with the front loader in particular. Usually, the reinforcing frames for increasing the body strength of the tractor are disposed below a principal portion of the tractor body. For attaching a mid-mount mower between front and rear wheels, the reinforcing frames are obstructive and have to be detached.
SUMMARY OF THE INVENTION
A primary object of this invention is to provide a tractor having reinforcing frames for allowing a mid-mount mower to be attached between front and rear wheels.
Another object of this invention is to provide a tractor having lightweight reinforcing frames and capable of attaching a mower.
A further object of this invention is to provide a tractor having reinforcing frames for equally allowing a front loader and a mower to be attached.
The above objects are fulfilled, according to this invention, by a tractor comprising an engine disposed in a front position of the tractor, a rear housing disposed in a rear position of the tractor and having at least one of a transmission case and a differential case, a main frame interconnecting the engine and the rear housing, a mower disposed between front wheels and rear wheels of the tractor to be movable between an operative position in contact with the grounded and inoperative position raised from the ground, and a pair of reinforcing frames formed separately from the main frame, extending longitudinally of the tractor, and fixed to the tractor at opposite sides of the main frame. Each of the reinforcing frames has an upper surface adjacent the rear housing located below a bottom of the rear housing. Each of the reinforcing frames is shaped to accommodate the mower in the inoperative position.
The above tractor has the reinforcing frames capable of accommodating the mower.
In a preferred embodiment of the invention, the reinforcing frames comprise plate-like frames. With this construction, the tractor has lightweight reinforcing frames for accommodating the mower.
In an embodiment of this invention, the reinforcing frames include a loader mount. With this construction, the tractor has the reinforcing frames for attaching both the mower and a front loader.
REFERENCES:
patent: 4737067 (1988-04-01), Samejima et al.
patent: 5123805 (1992-06-01), Ishimori et al.
patent: 58-62227 (1983-04-01), None
patent: 61-37086 (1986-03-01), None
patent: 63-156240 (1988-10-01), None
patent: 9-20265 (1997-01-01), None
Hamamoto Toshiyuki
Nakanishi Kiyokazu
Nishino Akifumi
Takekata Mitsuhiro
Dickson Paul N.
Kubota Corporation
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
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