Excavating – Scoop or excavating and transporting container – Supported on vehicle between longitudinally spaced ground...
Reexamination Certificate
1999-11-05
2001-10-16
Pezzuto, Robert E. (Department: 3671)
Excavating
Scoop or excavating and transporting container
Supported on vehicle between longitudinally spaced ground...
C037S416000
Reexamination Certificate
active
06301808
ABSTRACT:
BACKGROUND OF THE INVENTION
Technical Field of the Invention
This invention relates to earth moving equipment and in particular to an improved earth moving and land grading machines.
DESCRIPTION OF THE PRIOR ART
There have been proposed a number of different forms of such machine one of which is illustrated in applicant's prior Australian Patent No. 552006 dated Sep. 1, 1981 and the contents of the specification of the Patent are to be deemed to be incorporated herein as an example of the prior art.
The previously known equipment has been satisfactory in use and there are many machines both of the type disclosed in applicant's previous Patent and of other types which have been in substantial use over the last ten to fifteen years.
The machines, whilst satisfactory, do have certain disadvantages.
The first is in overall load capacity. This is determined largely, of course, by the size of the machine itself and the power of the tractor as the material being passed into the machine tends to bank up in the machine to cause an obstruction to move material entering and, further, as the road wheels of such devices are normally close to the back there can be a strong turning moment about the tractor draw bar and this, again, limits the carrying capacity.
These machines are often provided with rippers across the width of the machine and, forwardly, in the direction of movement of the bin or container. We have found in some applications that these cause very large pieces of soil to be lifted and this is not greatly satisfactory when it is to be later unloaded from the machine and, secondly, the fact that the rippers are across the width of the machine it necessitates a substantial amount of power for these to be forced to move through the ground.
SUMMARY OF THE INVENTION
The principal object of the invention is to provide earth moving equipment which minimizes the afore said difficulties.
The invention, in a first aspect, comprises an earth moving and land grading machine comprising a frame, road wheels on the frame and forwardly directed means to permit connection to a prime mover, the frame having associated therewith a bin or container for material characterized in that the rear wall of the bin is moveable between a first position, where the bin is effectively open and can receive soil therein, to a forward position during movement to which it can deliver the soil from the bin, characterised in that, the movement is by a hydraulic ram which is adapted to provide a mechanical advantage so that the wall moves forward a distance substantially greater than the equivalent extension of the ram.
In a first aspect the outer end of the piston of the ram is caused to move along a fixed path and is pivotally connected to an arm partway along the arm so that the portions of the arm on each side of the pivot have unequal lengths, the end associated with the longer length being connected to the wall and the other, associated with the shorter length being connected to the machine, the arrangement being such that on movement of the ram the wall is caused to move a distance greater than the movement of the piston of the ram.
In a second aspect of the invention the floor of the bin is of two parts, one of which is fixed and covers the forward end of the floor of the bin, and the other, which is moveable and adapted to move between a position where it is effectively behind the first part to provide a floor for the whole of the machine to a position where it substantially overlays the first part and terminates close to the front of the first part.
It is preferred that the wall is associated with the second part so that when the second part is behind the first part the wall is connected thereto, means being provided to release the connection of the wall when the second part overlies the first part so that the wall can be moved forwardly over the second part.
It is also preferred that when the second part of the floor is forwardly positioned, it is latched so as to be unable to move relative to the first part of the floor whilst the wall moves thereover, the latch being released when the wall reaches the rear thereof at which time the second part is re-connected to the wall to move rearwardly therewith.
This arrangement means that frictional resistance in respect of the earth entering the bin is substantially reduced. Delivery of material from the bin occurs in the opposite movement.
In a third aspect of the invention the road wheels are on each side of the machine and each side is provided with a pair of beams which are pivotally mounted, there being at least two wheels on each beam, the wheels of one of the beams are transversely further out from the body of the unit than the others, and the wheels on each beam being spaced differently in a longitudinal direction and are so arranged that they partially overlap so that build up of soil or mud on the wheels is prevented because of the close relationship between the wheels the wheels of the device are on each side of the device and on each side are provided on a pair of beams which are pivotally mounted, there being at least two wheels on each beam and the wheels of one of the beams are transversely further out from the body of the unit than the others, and the wheels are so arranged that they closely overlap so that build up of soil or mud on the wheels is prevented because of the frictional contact of the adjacent wheels.
REFERENCES:
patent: 3646693 (1972-03-01), Simmons
patent: 4393608 (1983-07-01), Hodge
patent: 5356238 (1994-10-01), Musil et al.
patent: 5824541 (1998-10-01), Horn et al.
patent: 5839212 (1998-11-01), Brinker
patent: 6041528 (2000-03-01), Broach
Pezzuto Robert E.
Schindler Edwin D.
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