Variable moment vibrator usable for driving objects into the ground
AssigneeProcedes Techniques de Construction
InventorChristian Houze
Life of this patent
Estimating the term…
Abstract
A vibrator has two series of eccentric weights each comprising at least two weights turning in opposite directions and at least one motor coupled to the first series of weights by gearing and to the second series of weights by a transmission device including a phase-shifter in the form of two coaxial shafts each comprising helical teeth and an annular piston which slides between the two shafts, delimiting therewith at least one working chamber into which a pressurized hydraulic fluid can be injected. The piston has helical teeth meshing with those on the two shafts. The vibrator enables self-regulation of the amplitude of the vibrations that it produces according to the behavior of the object to which the vibrations are imparted.
Claims12
Variable moment vibrator usable for driving objects into the ground comprising at least two series of eccentric weights each comprising at least two eccentric weights rotating about shafts to which are fastened respective gears which mesh with each other so as to rotate in opposite directions and a drive system comprising a first motor coupled to said first series of weights by first gearing and to said second series of weights by a transmission device separate from said first gearing and incorporating a phase-shifter comprising:
- a first transmission shaft mounted to rotate on a fixed structure and comprising at least one portion in the form of a cylindrical sleeve whose internal bore comprises a first sealing surface and a first internally screwthreaded part with helical teeth;
- a cylindrical second transmission shaft mounted to rotate coaxially with said first transmission shaft and delimiting therewith an annular space closed at one end by an end wall, said second transmission shaft comprising a second sealing surface and a first externally screwthreaded part with helical teeth;
- an annular piston member axially mobile in said annular space and having a cylindrical external surface comprising in succession a third sealing surface adapted to slide in fluid-tight manner on said first sealing surface and a second externally screwthreaded part having helical teeth meshing with the teeth of the first internally screwthreaded part and an inside surface comprising in succession a fourth sealing surface adapted to slide in fluid-tight manner on said second sealing surface and a second internally screwthreaded part having helical teeth meshing with the helical teeth of the first externally screwthreaded part;
- and
- a pressurized fluid inlet circuit comprising an axial passage in said second transmission shaft which discharges at one end into a working chamber delimited by the two transmission shafts and the annular piston member and at the other end into a distribution passage via a rotary seal mounted at the end of said second transmission shaft.
Dependencies are inferred from the claim text.