Road structure – process – or apparatus – Apparatus – Tamper
Patent
1980-08-11
1982-08-10
Byers, Jr., Nile C.
Road structure, process, or apparatus
Apparatus
Tamper
404116, 404114, E01C 1938
Patent
active
043435688
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a road grading and tamping appliance with a bottom plate and a revolving, driven and eccentrically-supported centrifugal weight.
Background various constructions of road grading and tamping appliances and known in which an eccentrically-supported weight is kept in rotation. In road rollers with roller cylinders rotating about an axle, the eccentrically-supported weights rotate about the axle of the drums, that is about a horizontal axle. Other types of road grading and tamping appliances which are equipped with one bottom plate or a plurality of bottom plates have vibratory device so designed that the eccentric weights are supported on a horizontal axle shaft. In both cases the centrifugal force of the eccentric weights, or the conforming components of same, takes effect, with level ground surface subjected to compaction, in the direction perpendicular to that surface. The centrifugal force of the eccentric weight is greatest when the eccentric weights are vertical in the lower or upper position. In each other position of the eccentric weights only components of the action of force in the downwards or upwards verticals are operative. This means that only a small component of the eccentric rotating weights can be used for the compaction of the ground.
THE INVENTION
It is an object to provide a road grading and tamping appliance in which the rotating eccentric weight can be fully used for the compaction of the ground.
In accordance with the invention the bottom plate has arranged perpendicular thereto a shaft which is provided with an eccentric weight or a plurality of eccentric weights in a plane situated parallel to the bottom plate and at a distance from the latter.
In the case of such a road grading and tamping appliance, a which the eccentric weight or mass is arranged horizontally on a vertical shaft, the eccentric rotating weight is operative in a horizontal plane. As this so-supported eccentric weight is operative at a predetermined distance from the bottom plate, a lever force is applied via the vertical shaft or axle of the road grading and tamping appliance. The bottom plate is tipped, or tilted into a rocking position, continuously all around, and thereby performs a wobbling motion by tilting the bottom plate in a circular orbit as the mass rotates. The ground is consolidated or compacted in this region through this wobbling motion of the bottom plate. The vertical shaft transmits the moment produced above to the bottom plate in like manner, so that a consolidation of the ground is accomplished through the constant wobbling motion of the bottom plate. This consolidation or compaction takes place rapidly all round, that is the energy of the eccentric weight is constantly converted into ground compaction or compression work. With increasing compaction of the ground the vibration or the wobble effect of the road grading and tamping appliance is reduced and this serves as an indication of compaction being completed. One eccentric weight only is sufficient in the case of the road grading and tamping appliance in accordance with the invention.
According to a further feature of the invention, the rotating eccentric weight can be adjusted in the axial direction of the vertical shaft. In that way the lever action or the moment is reduced or increased as a function of the length of the lever arm, and this signifies a reduction or increase of the compaction work. Moreover the rotational speed of the rotating weight may be modified. In particular the road grading and tamping appliance may be so formed that there is rigidly connected with the bottom plate a casing in which is supported for rotation the shaft disposed vertically to the bottom plate. The rotating eccentric weight is arranged displaceable along the shaft and can be adjusted the locked by means of an operating device movable along a casing guideway, for example a slot. There may be joined with eccentric weight a sleeve-adjacent piece which supports a roller bearing. The operating device may with this engage by means of
REFERENCES:
patent: 2061943 (1936-11-01), Jorgensen
patent: 2223024 (1940-11-01), Beierlein
patent: 2400341 (1946-05-01), Day
patent: 2411317 (1946-11-01), Day
patent: 2740336 (1956-04-01), Degen
patent: 2828676 (1958-04-01), Steuerman
patent: 2917979 (1959-12-01), Denning
patent: 3673931 (1972-07-01), Dening
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