The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1978
Filed:
Jun. 20, 1977
Roger L Carlson, Fridley, MN (US);
Raygo, Inc., Minneapolis, MN (US);
Abstract
A uniaxial vibratory force generator especially adapted for use as a pile driver, which comprises a rigid frame structure having a power actuated clamp at its bottom by which the frame structure grips a pile, and attachment means at its top by which the frame structure is suspended from above. In the frame structure are two superimposed pairs of counter-rotating eccentric weights, each of which is driven by a hydraulic motor. Simultaneous rotation of all of the eccentric weights produces a uniaxial force of a magnitude determined by the phase relationship between the superimposed pairs of eccentric weights. An adjustable coupling between the superimposed pairs of eccentric weights enables that phase relationship to be selectively varied. The coupling is in the form of two meshing gears, one of which is fixed to the shaft of one of the motors driving the eccentric weights of one pair thereof and the other of which has a helically splined connection with a sleeve that is axially splined to the shaft of the adjacent motor of the other pair of eccentric weights. Axial adjustment of the sleeve with respect to the gear mounted thereon thus changes the angular relationship of that gear with respect to the shaft to which the sleeve is splined and, in so doing, effects a corresponding adjustment of the phase relationship between the eccentric weights of the two pairs thereof.