Motors: expansible chamber type – Independently operated timer – delay – pattern or cyclic control – Independent distributor actuation for cyclic control
Patent
1989-12-21
1992-08-11
Look, Edward K.
Motors: expansible chamber type
Independently operated timer, delay, pattern or cyclic control
Independent distributor actuation for cyclic control
91226, 91327, 60459, F15B 2102
Patent
active
051369265
DESCRIPTION:
BRIEF SUMMARY
This invention relates to vibratory power generators.
This invention specifically relates to vibratory power generators of a type in which power is derived through pumped hydraulic fluid and which is arranged to provide a driving force the amplitude of which will cyclically vary.
This invention is directly concerned with providing substantial mechanical power of oscillatory character at frequencies from about 20 Hertz up to the order of at least about 1000 Hertz, although having greatest interest in the difficult range of 200-500 Hertz.
Devices that have hitherto been used such as rotating weights have a significant problem in that they depend upon mechanical parts such as bearings which are unable to be economically designed to withstand the necessary forces.
Levels of power to which this invention is directed are such that such power will be adequate to effect the driving of piles.
Further, with previous devices, the method of creating such forces can result in forces causing reaction in a number of directions which can have the result of introducing not only extraneous but interfering forces which are either of no benefit or have a deleterious effect on a result required.
Such can be the case for instance where a rotating weight device is used to create ground waves for examination of characteristics of the earth beneath the ground.
An example of a device that uses hydraulic fluid to create vibratory impact is shown in Australian Patent 479534 in the name of A/S Moelven Brug. This has difficulties insofar that the rotary valve by which hydraulic fluid is controlled is used to provide a reaction effect and the surrounding housing is attached to the load to which the hydraulic couplings must be made in lateral disposition to the expected reaction movement.
With this arrangement, the couplings connecting the hydraulic lines being subject to substantial reactionary forces will introduce significant limitations to the total power that can be effected in this manner. The object of this invention is to avoid some of the difficulties associated with previous proposals.
According to this invention then there is proposed an arrangement to effect a periodically varying force including an inertial body, a valve within the inertial body, housing means adapted to be affixed to load means and slidably moveable with respect to the inertial body, a source of fluid pressure connected to the inertial body, means to control the valve so as to periodically and alternately direct the fluid at pressure into a first working chamber and then a second working chamber, each working chamber being defined by the housing means and the inertial body, and such that introduction of fluid at pressure into the first chamber will effect a force urging the housing to move in a first direction relative to the inertial body and in which direction the housing means is movable relative to the body, and introduction of fluid at pressure into the second chamber will effect a force urging the housing to move in a second direction which is opposite to the first said direction and in which second direction the housing means is moveable relative to the body.
In preference, the valve also provides for exhausting of the fluid at pressure from the respective working chambers.
In preference, the fluid at pressure is an hydraulic fluid and there are means to direct said hydraulic fluid within the inertial body to the valve and there are means to direct said hydraulic fluid subsequent to exhaustion from a working chamber through the inertial body.
In preference, the valve is a mechanical device which is rotatably driven whereby to effect the alternate and periodic direction of said fluid at pressure.
In preference, the inertial body includes two coaxially aligned conduits, there being thereby defined a first passageway through the inertial body between said inner conduit and said outer conduit, and a second passageway being through the inner conduit.
In preference, the means for effecting rotation of the valve comprise an inner conduit which is adapted to
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Resnick et al, Physics pp. 372-374 .COPYRGT.1966.
Bies David A.
Page Stewart
Look Edward K.
Lopez F. Daniel
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