Excavating – Road grader-type
Reexamination Certificate
1999-04-22
2001-01-16
Pezzuto, Robert E. (Department: 3671)
Excavating
Road grader-type
C404S090000
Reexamination Certificate
active
06173512
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a scarifying machine provided with re-entering back wheels.
It is known that scarifying machines are manufacturing machines used for soil removal and particularly for the removal of the roadway carpet.
Fundamentally a scarifying machine includes a frame realized in strong metallic carpentry, provided with a milling drum placed into contact with the soil to be removed and supported by an horizontal rotation shaft connected to the frame.
The frame, in which there is a driving place where the operator sits, is supported by a couple of front driving wheels and by a couple of back wheels. The said back wheels are placed near the milling drum. Motorization means housed in an engine compartment included in the frame, impart a rotation to the milling drum and to the wheels for shifting the machine.
As regards the back wheels, each one of them is connected to a plate supported by an hydraulic cylinder with a vertical axis adjusting the depth of the ground penetration of the milling drum in order to change the milling depth. An articulation unit fixed to the frame and connected to the plate supporting the wheel, allows a projecting arrangement of the said wheel or a re-entering position with respect to the frame.
The possibility of placing the back wheels in a projecting position from the frame, allows the improvement of the weight distribution. On the contrary, the possibility of placing the back wheels also in a re-entering position with respect to the frame, allows the use of the scarifying machine to make excavations as far as reaching a wall. Moreover the shifts of the scarifying machine are made easier by the re-entered wheels when the machine is not operative.
SUMMARY OF THE INVENTION
According to the realizations of the known type the positioning of the back wheels in a re-entered arrangement or in a projecting one, is made manually by the operator. The operator works also on suitable manual hooking and release devices allowing the locking of each wheel in the re-entering position or in the projecting one in which it has been placed.
It can be understood that the manual character of the shift is awkward for the operator who is forced, in order to carry it out, to get out of the machine and to go on both sides of it to carry out the move of the wheel rotation.
The invention intends to overcome said limitation by realizing a scarifying machine for soil removal in which the shift operation of the back wheels from the projecting position to the re-entering position with respect to the frame is made in an automatized way.
Another aim is that after having been placed in the wanted position, each wheel can be locked automatically in the reached position.
A further aim is that the unlocking, shifting and following locking operations of each wheel are made automatically, in sequence and through the operation of a single drive member.
The said aims are reached through the realization of a scarifying machine for soil removal that, according to the main claim includes:
a frame including a driving place, supported by at least—a couple of front wheels and by at least a couple of back wheels;
a milling drum placed into contact with the soil to be removed and supported by a rotating shaft connected to said frame;
motorization means supported by said frame suitable to impart a rotation to said milling drum and to at least one of said wheels, and is characterized in that each one of said back wheels is supported by an articulation unit mechanically connected to said frame and cooperating with first actuator means suitable to shift said articulation unit in order to arrange said wheel from a position projecting laterally from said frame to a position re-entering with respect to the frame and vice versa.
According to a preferred embodiment the articulation unit includes also second actuator means making the articulation unit fixed with respect to the machine frame when the respective wheel is placed in a projecting position or in a reentering position with respect to the frame.
Advantageously, according to the invention the manual character of the shift of the back wheels is eliminated. The shift is therefore made faster and safer for the operator.
REFERENCES:
patent: 5378081 (1995-01-01), Swisher, Jr.
Bitelli SPA
Dykema Gossett PLLC
Pezzuto Robert E.
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