CA2042499A1 - Eccentric mass structure - Google Patents
Eccentric mass structureInfo
- Publication number
- CA2042499A1 CA2042499A1 CA 2042499 CA2042499A CA2042499A1 CA 2042499 A1 CA2042499 A1 CA 2042499A1 CA 2042499 CA2042499 CA 2042499 CA 2042499 A CA2042499 A CA 2042499A CA 2042499 A1 CA2042499 A1 CA 2042499A1
- Authority
- CA
- Canada
- Prior art keywords
- disk
- cavities
- eccentric mass
- mass structure
- specific gravity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
- B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
- E02D3/074—Vibrating apparatus operating with systems involving rotary unbalanced masses
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Transmission Devices (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Golf Clubs (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
ABSTRACT
In an improved structure of eccentric mass comprising a metal disk (generally a steel disk) rotating around its central axis, said disk is provided with at least a cavity located in a radially more external area with respect to said axis, said cavity housing at least one pad or plug of a material having specific gravity different from namely either greater or lower than that of said material of said disk.
In an improved structure of eccentric mass comprising a metal disk (generally a steel disk) rotating around its central axis, said disk is provided with at least a cavity located in a radially more external area with respect to said axis, said cavity housing at least one pad or plug of a material having specific gravity different from namely either greater or lower than that of said material of said disk.
Description
` ^ -- 2~2~9~
The present invent:ion re]ates to an improved structure of an eccentric mass to be used in vibrators such as material tampi.ng devices, pile drivers, vibratin~ tabl.es, and generel.]y vibrators for the conveying of small ar~ic].es and the ].ike.
In these device tbe general. structure comprises supporting members in which bearing are included, the ]atter requiring a continuous lubrication.
This ].ubrication can be of two types, one the so-called by fluttering and the other that by nebu].iz~tion .
General].y the nebu].ized ].ubrication consists in the throwing of oil sprays onto the bearings, col]ecting the oil excess in a recovery basin and returning the oi]. from the basin to the spraying no7zles by means of a pump3 this type of ]ubrication is on].y performed in free atmosphere.
The lubrication by f]uttering , which can be carried out both in a free atmosphere and under vacuum , generally consists in driving into rotation an eccentric mass w:ithin an oi]. container, the oil bein~ thrown by the centrifugal force towards the periphery of the basin, wherein sma].l channe].s are provided by which the oi]. is conveyed towards the bearings and then co].lected onto the bottom of the same basin.
Several types of eccentric masses are known.
A first type consists of a meta]. semicircular disk (for instance an iron disk) driven into rotation around its axis, whereby at each half turn an impact against the oil mass occurs, the ].atter being pushed a~ainst the walls of the basin. This impact is generally rather strong, although being dependent on the diameter of the disk, on the thickness thereof and on the viscosity of the oil3 thus this type Or eccentric mass has its use restricted to the range of the smal.l powers.
In order to enl.arge the app].ication range of the eccentric mass, it has been proposed to enc].ose the semicircular dislc within a metal semicircu]ar housing, having ]ow thickness ~such as for example a case of metal sheet).
Although by this expedient the above mentioned impact wi.th the oil is , , ,, . . ~ , , . , :
The present invent:ion re]ates to an improved structure of an eccentric mass to be used in vibrators such as material tampi.ng devices, pile drivers, vibratin~ tabl.es, and generel.]y vibrators for the conveying of small ar~ic].es and the ].ike.
In these device tbe general. structure comprises supporting members in which bearing are included, the ]atter requiring a continuous lubrication.
This ].ubrication can be of two types, one the so-called by fluttering and the other that by nebu].iz~tion .
General].y the nebu].ized ].ubrication consists in the throwing of oil sprays onto the bearings, col]ecting the oil excess in a recovery basin and returning the oi]. from the basin to the spraying no7zles by means of a pump3 this type of ]ubrication is on].y performed in free atmosphere.
The lubrication by f]uttering , which can be carried out both in a free atmosphere and under vacuum , generally consists in driving into rotation an eccentric mass w:ithin an oi]. container, the oil bein~ thrown by the centrifugal force towards the periphery of the basin, wherein sma].l channe].s are provided by which the oi]. is conveyed towards the bearings and then co].lected onto the bottom of the same basin.
Several types of eccentric masses are known.
A first type consists of a meta]. semicircular disk (for instance an iron disk) driven into rotation around its axis, whereby at each half turn an impact against the oil mass occurs, the ].atter being pushed a~ainst the walls of the basin. This impact is generally rather strong, although being dependent on the diameter of the disk, on the thickness thereof and on the viscosity of the oil3 thus this type Or eccentric mass has its use restricted to the range of the smal.l powers.
In order to enl.arge the app].ication range of the eccentric mass, it has been proposed to enc].ose the semicircular dislc within a metal semicircu]ar housing, having ]ow thickness ~such as for example a case of metal sheet).
Although by this expedient the above mentioned impact wi.th the oil is , , ,, . . ~ , , . , :
2 2~2~
avoided and an oi:l elltr~inlllcllt effect occurs, however the we]ding 'seams and/or the riveted joints of the outer case remain the weak point of the assembly, with serious possibilities of breakages and consequent detachment of the c~se from the interna]. semicircu].ar disk.
Anotller type of eccentric m~ss consists of a disk of circu]ar shape in which, by milling, the semicircu].ar shape of the eccentric mass is formed whereby the previously described rotation is created again, but in a monolithic form.
In this way the strong impacts of the above cited first case are reduced and obviously the detachment of the second cited case cannot take place, but the force that the mass may apply during its rotation is relevantly ].imited. .
The presence of a f].uttering effect causes the number of rotations of the eccentric mass to be compu].sori].y reduced, with the attendant reduction of the entrainment effect with respect to the secondly cited case.
The purpose of the present invention is that of providing a solution overcoming the above mentioned drawbacks in terms of impact and detachment of the components of the eccentric mass, together with a greater efficacy of displacement of the oil mass against the peripheral wal]. of the basin (without an exceedingly high consumption of energy).
Thus the object of the present inventlon is an improved structure of the eccentric mass comprising a rmetal disk (generally a steel disk) rotating around its central axis, characterized in that said disk consists of a material having a determined specific gravity and is provided with at .~ .
].east a cavity ].ocated in a radial].y more externa] area with respect to said axis, said cavity housing at least one pad of a material having specific gravity different from that of said materia]. of said disk.
According to a first preferred embodiment of the present invention said disk has at least two cavities respectively located at opposed zones with respect to a symmetry axis of said disk, said symmetry axis being perpendicular to said rotation axis, one of said opposed cavities housing a pad or p].ug of a material having specific ~ravity higher than that of : .' ' . . : ',, . ' :, ' ' _3_ 2~
the material. of s~id d:i.sk or of a matcria] having specific gravity,].ower than that of the material -forming said disk.
~ccording: to another embodiment of the present invention, said disk has at ~.east two cavities respective]y located at opposed zones with respect to a symmetry axis perpendicul.ar to said centra]. axis, at :Least one of said cavities housing a pad or p].ug of a material having specific gravity higher than that of the materia.]. forming said disk, and at least one of :~
the cavities located in the opposed zone with respect to said symmetry axis housing a pad or p~ug of a materia]. having specific gravity ].ower than that of the m~terial forming said disk.
According to a further preferred embodiment of the present invention said disk is provided with a number of cavities located along a circular. crown coaxia]. with rcspect to said disk, at ].east one of the cavities located from one side with respect to a symmetry axis of said disk, perpendicular to said rotation axis, housing at ].east a pad or plug of a material having specific gravity higher than that of the material forming said disk, and at ]east one of the said cavities located at the opposite si.de of said symmetry axis housing a pad or plug of a material havin~ specific gravitiy ].ower than that of the materia]. forming said disk.
Said cavities have preferab]y circu].ar shape or, al.ternatively, consist of circular through ho]es.
Still preferably said p].ugs have the same shape as that of sai.d cavi~ies and are permanently forced within said cavities.
Preferab].y said heavier pads or p].ugs are of a material selected among .
].ead, wolfram and their alloys.
Still pre~erab].y said ].i~hter pads or p].ugs are of a p].astic material se].ected among nyl.on, pol.yethylene therephtalate and their mixtures. ~:
Thé specific features and advantages of the present invention shall appear more c].ear].y ~rom the fo].lowing description of a preferred embodiment, having illustrative but non limiting purpose, with reference to the accompanying drawings, in which: - ~
fig. 1 is a perspective view of the structure of eccentric mass according : : .
,,.. :,: .: . , ., , . . .. " ",. . ,: , . . , , . . . : .;, . ......... .. . ..
, . , " , , ,: , , ,: :: : , , : : : , ,; " . : "
:~ 4 2~2~99 to the present invention;
fig. 2 is a plan vie~ of~the eccentric mass structure of fi~
Referring to the figs. I and 2, reference 10 indicated generical].y the structure of the eccentric mass; it consists of a disk 11 havin~ a certain thickness, of a meta] materia]. such as steel, iron , cast iron :and aluminium or even of a plastic material resistant to the oil action. :
The disk 11 having essentia].]y circular shape is rotatable around its . .: .
central axis 11 and is manufactured so as to be substantially dynamically balanced, owing to the profi]e thereof, without the presence of .:.
particular hetero~eneous masses in its body outward]y of its rotation ~.
axis. :
The disk 1I has si.x ho]es 13, the axes of which lie on a circular crown 14, the axis of which is coincident with that of said disk~ the diameter of the crown and the diameter of the holes are selected so that a re].evant space S exists between the most outer end of each hole and the circumference forming the border line of the disk. :
At the center of the disk the device for the splining of the disk to the rotation shaft (not shown) is provided, but no further comments shall be .
given, since it is within the reac~l of the man skilled in this ar~t.
Taking as the symmetry axis of the disk 11 the axis XX, the three holes 15, 16 and 17, 1aying in the ]ower part with respect to the said ..
symmmetry axis, house respectively the pads 18, 19 and 20 of cylindrical shape and of a materia]. having specific ~ravity higher than that of the material of the disk l1, preferbaly leadj wolfram, or an a].loy containing ~ :-at least one of said metals. :-The three ho].es 21, 22 and 23, ~.aying in the upper part with respect to the said symmetry axis, house respectivel.y the p].u~s 24, 25 and 26 stil].
of cylindriea.]. shape and of a materia]. havin~ specifie ~ravity lower than ; `
that of the materia]. of the disk 11, preferab].y a plastie materia]. like nylon (having specific gravity 1.2) and polyethy]ene terephtalate, or ~ ..
compounds of these plastic materia]s.
The pads and the plu~s have a size such that they are forced within the ;~
, ', . ' ' ' 1 ' ~ ' i. ' . : ' . . . ' ' . ' ' ' : . .~ . . ' ' .
~5~ 20~24~9 respective holes, thus bei.Il~ perIllanent]y and certainly bl.ocked thereinto.
~or further safety the screws 27 c~n be added, actin~ a~ainst the pads and the p]ugs in a radial direction.
According to a particul.ar embodiment the hol.es 13 might lay along two l.ines para].le]. to the symmetry axis XX, at one side and at the other side of said axis.
The holes 13 may be in a number different from six, as described, and mi~ht even consist of only one hol.e ].ocated at one side with respect to the symmetry axis XX and spaced therefrom, said hole being provided with a lead pad or proper si%e: in this case an eccentric mass would be obtained suitable for some uses.
The addition of a ho~.e prov:ided with a nyl.on pl.ug at the opposite zone and ~t the same distll-ce from the symInctry axis may enhance the performances of the eccentric mass.
The holes may have different shapes besides the above described cylindrical one3 for example they can be blind cavities, have triangular, square, poly~onal. or slice or other shape3 of course the pads and plu~s shal.l have like shapes.
The pads/plugs, instead of being forced, can be glued, when it is consistent with the materia~.s being employed, a].though this type of attachment might to sometimes economical.l.y less advanta~eous than the forcin~.
Alternatively the hol.es and the related pads/plu~s might be screw threaded and assembled by screwin~, al.thou~h in particular cases of particularly heavy uses, s]ight re].ative, undesired displacements of the assemb~.ed elements mi~ht occur.
The shape of the pads/p].u~s must be consistent with that of the hol.es/cavity of the disk, but it does not mean that their shapes must be identical3 for example whilst the shape of the holes/cavities may be cy].indrical, the shape of the correspondin~ pads/p].ugs may be partial]y cy].indrical. with side planar surfaces, as indicated by the reference 28 with dashed lines in fig. 2.
.,: ~
`'~
.. ~ ,'' '"' ''"
~ 6- 2~2~99 ~ ~
The structure of eccentric mass accordin~ to the present invention and above descr.ibed with respect to a preferred embodiment thereof, to~ether with some different construction alternatives, does comp]ete]y fu].fil]
the purposes sought for, namel.y to improve the performances of the ].ike structures known in the prior art.
As a matter of fact the described structure of eccentric mass, consisting of an essentia].].y circu].ar disk (and possib].y s].i~htly e].].iptical) has no impact effects on the ]iquid to be disp].aced a~ainst the walls of the basin; on the contrary on]y ]iquid entrainment effects are shown therefrom: that means that this structure is suitable also for high power vibrators, whereby the use fie].d is broadened.
More particu].ar].y the structure of the invention is capab].e of enduring without prob].ems a hi~her number of rotations of the disk and an eccentric mass is obtained re].evant].y ~reater than those .of the prior art, with the resu].tin~ ~reater efficacy of displacement of the ].iquid mass3 alternative].y the efficacy bein~ the same, the structure is rei.evantly ].ess encumberin~.
Furthermore the prob].ems of detachment of the component e].ements are no ].on~er present (as in the case of the eccentric mass housed in a case)3 the structure of~the present invention as a matter of fact consists of massive members secured to each other in a quite fi~ed manner, whereby an essential].y compact structure resu]ts; consequent].y the structure of the lnVentiOn can be effective].y used a].so in the case of vibratin~ devices operatin~ under the most serious conditions, both in terms of frequency ~nd in terms of vi.~rat:i.ons.
Not negl.i~ib].e is a].so the fea.ture of the simp].icity of the eccentric mass structure by which the manufactin~ becomes ea.sy and ready, thus positively affecting the industrial. production costs.
~].thougb the eccentric mass structure accordi.n~ to the present invention has been described with reference to a preferred embodiment and to several a].ternative variations, possib].e further modifications thereof are considered as fa].].ing within the main concept characterizing the present invention.
avoided and an oi:l elltr~inlllcllt effect occurs, however the we]ding 'seams and/or the riveted joints of the outer case remain the weak point of the assembly, with serious possibilities of breakages and consequent detachment of the c~se from the interna]. semicircu].ar disk.
Anotller type of eccentric m~ss consists of a disk of circu]ar shape in which, by milling, the semicircu].ar shape of the eccentric mass is formed whereby the previously described rotation is created again, but in a monolithic form.
In this way the strong impacts of the above cited first case are reduced and obviously the detachment of the second cited case cannot take place, but the force that the mass may apply during its rotation is relevantly ].imited. .
The presence of a f].uttering effect causes the number of rotations of the eccentric mass to be compu].sori].y reduced, with the attendant reduction of the entrainment effect with respect to the secondly cited case.
The purpose of the present invention is that of providing a solution overcoming the above mentioned drawbacks in terms of impact and detachment of the components of the eccentric mass, together with a greater efficacy of displacement of the oil mass against the peripheral wal]. of the basin (without an exceedingly high consumption of energy).
Thus the object of the present inventlon is an improved structure of the eccentric mass comprising a rmetal disk (generally a steel disk) rotating around its central axis, characterized in that said disk consists of a material having a determined specific gravity and is provided with at .~ .
].east a cavity ].ocated in a radial].y more externa] area with respect to said axis, said cavity housing at least one pad of a material having specific gravity different from that of said materia]. of said disk.
According to a first preferred embodiment of the present invention said disk has at least two cavities respectively located at opposed zones with respect to a symmetry axis of said disk, said symmetry axis being perpendicular to said rotation axis, one of said opposed cavities housing a pad or p].ug of a material having specific ~ravity higher than that of : .' ' . . : ',, . ' :, ' ' _3_ 2~
the material. of s~id d:i.sk or of a matcria] having specific gravity,].ower than that of the material -forming said disk.
~ccording: to another embodiment of the present invention, said disk has at ~.east two cavities respective]y located at opposed zones with respect to a symmetry axis perpendicul.ar to said centra]. axis, at :Least one of said cavities housing a pad or p].ug of a material having specific gravity higher than that of the materia.]. forming said disk, and at least one of :~
the cavities located in the opposed zone with respect to said symmetry axis housing a pad or p~ug of a materia]. having specific gravity ].ower than that of the m~terial forming said disk.
According to a further preferred embodiment of the present invention said disk is provided with a number of cavities located along a circular. crown coaxia]. with rcspect to said disk, at ].east one of the cavities located from one side with respect to a symmetry axis of said disk, perpendicular to said rotation axis, housing at ].east a pad or plug of a material having specific gravity higher than that of the material forming said disk, and at ]east one of the said cavities located at the opposite si.de of said symmetry axis housing a pad or plug of a material havin~ specific gravitiy ].ower than that of the materia]. forming said disk.
Said cavities have preferab]y circu].ar shape or, al.ternatively, consist of circular through ho]es.
Still preferably said p].ugs have the same shape as that of sai.d cavi~ies and are permanently forced within said cavities.
Preferab].y said heavier pads or p].ugs are of a material selected among .
].ead, wolfram and their alloys.
Still pre~erab].y said ].i~hter pads or p].ugs are of a p].astic material se].ected among nyl.on, pol.yethylene therephtalate and their mixtures. ~:
Thé specific features and advantages of the present invention shall appear more c].ear].y ~rom the fo].lowing description of a preferred embodiment, having illustrative but non limiting purpose, with reference to the accompanying drawings, in which: - ~
fig. 1 is a perspective view of the structure of eccentric mass according : : .
,,.. :,: .: . , ., , . . .. " ",. . ,: , . . , , . . . : .;, . ......... .. . ..
, . , " , , ,: , , ,: :: : , , : : : , ,; " . : "
:~ 4 2~2~99 to the present invention;
fig. 2 is a plan vie~ of~the eccentric mass structure of fi~
Referring to the figs. I and 2, reference 10 indicated generical].y the structure of the eccentric mass; it consists of a disk 11 havin~ a certain thickness, of a meta] materia]. such as steel, iron , cast iron :and aluminium or even of a plastic material resistant to the oil action. :
The disk 11 having essentia].]y circular shape is rotatable around its . .: .
central axis 11 and is manufactured so as to be substantially dynamically balanced, owing to the profi]e thereof, without the presence of .:.
particular hetero~eneous masses in its body outward]y of its rotation ~.
axis. :
The disk 1I has si.x ho]es 13, the axes of which lie on a circular crown 14, the axis of which is coincident with that of said disk~ the diameter of the crown and the diameter of the holes are selected so that a re].evant space S exists between the most outer end of each hole and the circumference forming the border line of the disk. :
At the center of the disk the device for the splining of the disk to the rotation shaft (not shown) is provided, but no further comments shall be .
given, since it is within the reac~l of the man skilled in this ar~t.
Taking as the symmetry axis of the disk 11 the axis XX, the three holes 15, 16 and 17, 1aying in the ]ower part with respect to the said ..
symmmetry axis, house respectively the pads 18, 19 and 20 of cylindrical shape and of a materia]. having specific ~ravity higher than that of the material of the disk l1, preferbaly leadj wolfram, or an a].loy containing ~ :-at least one of said metals. :-The three ho].es 21, 22 and 23, ~.aying in the upper part with respect to the said symmetry axis, house respectivel.y the p].u~s 24, 25 and 26 stil].
of cylindriea.]. shape and of a materia]. havin~ specifie ~ravity lower than ; `
that of the materia]. of the disk 11, preferab].y a plastie materia]. like nylon (having specific gravity 1.2) and polyethy]ene terephtalate, or ~ ..
compounds of these plastic materia]s.
The pads and the plu~s have a size such that they are forced within the ;~
, ', . ' ' ' 1 ' ~ ' i. ' . : ' . . . ' ' . ' ' ' : . .~ . . ' ' .
~5~ 20~24~9 respective holes, thus bei.Il~ perIllanent]y and certainly bl.ocked thereinto.
~or further safety the screws 27 c~n be added, actin~ a~ainst the pads and the p]ugs in a radial direction.
According to a particul.ar embodiment the hol.es 13 might lay along two l.ines para].le]. to the symmetry axis XX, at one side and at the other side of said axis.
The holes 13 may be in a number different from six, as described, and mi~ht even consist of only one hol.e ].ocated at one side with respect to the symmetry axis XX and spaced therefrom, said hole being provided with a lead pad or proper si%e: in this case an eccentric mass would be obtained suitable for some uses.
The addition of a ho~.e prov:ided with a nyl.on pl.ug at the opposite zone and ~t the same distll-ce from the symInctry axis may enhance the performances of the eccentric mass.
The holes may have different shapes besides the above described cylindrical one3 for example they can be blind cavities, have triangular, square, poly~onal. or slice or other shape3 of course the pads and plu~s shal.l have like shapes.
The pads/plugs, instead of being forced, can be glued, when it is consistent with the materia~.s being employed, a].though this type of attachment might to sometimes economical.l.y less advanta~eous than the forcin~.
Alternatively the hol.es and the related pads/plu~s might be screw threaded and assembled by screwin~, al.thou~h in particular cases of particularly heavy uses, s]ight re].ative, undesired displacements of the assemb~.ed elements mi~ht occur.
The shape of the pads/p].u~s must be consistent with that of the hol.es/cavity of the disk, but it does not mean that their shapes must be identical3 for example whilst the shape of the holes/cavities may be cy].indrical, the shape of the correspondin~ pads/p].ugs may be partial]y cy].indrical. with side planar surfaces, as indicated by the reference 28 with dashed lines in fig. 2.
.,: ~
`'~
.. ~ ,'' '"' ''"
~ 6- 2~2~99 ~ ~
The structure of eccentric mass accordin~ to the present invention and above descr.ibed with respect to a preferred embodiment thereof, to~ether with some different construction alternatives, does comp]ete]y fu].fil]
the purposes sought for, namel.y to improve the performances of the ].ike structures known in the prior art.
As a matter of fact the described structure of eccentric mass, consisting of an essentia].].y circu].ar disk (and possib].y s].i~htly e].].iptical) has no impact effects on the ]iquid to be disp].aced a~ainst the walls of the basin; on the contrary on]y ]iquid entrainment effects are shown therefrom: that means that this structure is suitable also for high power vibrators, whereby the use fie].d is broadened.
More particu].ar].y the structure of the invention is capab].e of enduring without prob].ems a hi~her number of rotations of the disk and an eccentric mass is obtained re].evant].y ~reater than those .of the prior art, with the resu].tin~ ~reater efficacy of displacement of the ].iquid mass3 alternative].y the efficacy bein~ the same, the structure is rei.evantly ].ess encumberin~.
Furthermore the prob].ems of detachment of the component e].ements are no ].on~er present (as in the case of the eccentric mass housed in a case)3 the structure of~the present invention as a matter of fact consists of massive members secured to each other in a quite fi~ed manner, whereby an essential].y compact structure resu]ts; consequent].y the structure of the lnVentiOn can be effective].y used a].so in the case of vibratin~ devices operatin~ under the most serious conditions, both in terms of frequency ~nd in terms of vi.~rat:i.ons.
Not negl.i~ib].e is a].so the fea.ture of the simp].icity of the eccentric mass structure by which the manufactin~ becomes ea.sy and ready, thus positively affecting the industrial. production costs.
~].thougb the eccentric mass structure accordi.n~ to the present invention has been described with reference to a preferred embodiment and to several a].ternative variations, possib].e further modifications thereof are considered as fa].].ing within the main concept characterizing the present invention.
Claims (10)
1. Improved eccentric mass structure comprising a disk rotating around its central axis, characterized in that said disk consists of a material having a determined specific gravity and is provided with at least one cavity located in a radially more external area with respect to said axis, said cavity housing at least one pad of a material having specific gravity different from that of said material of said disk.
2. Improved eccentric mass structure according to claim 1, characterized in that said disk has at least two cavities respectively located at opposed zones with respect to a symmetry axis of said disk, said symmetry axis being perpendicular to said rotation axis, one of said opposed cavities housing a pad or plug of a material having specific gravity higher than that of the material of said disk or of a material having specific gravity lower than that of the material forming said disk.
3. Improved eccentric mass structure according to claim 1, characterized in that said disk has at least two cavities respectively located at opposed zones with respect to a symmetry axis perpendicular to said central axis, at least one of said cavities housing a pad or plug of a material having specific gravity higher than that of the material forming said disk, and at least one of the cavities located in the opposed zone with respect to said symmetry axis housing a pad or plug of a material having specific gravity lower than that of the material forming said disk.
4. Improved eccentric mass structure according to claim 1, characterized in that said disk is provided with a number of cavities located along a circular crown coaxial with respect to said disk, at least one of the cavities located from one side with respect to a symmetry axis of said disk, perpendicular to said rotation axis, housing at least or plug of a material having specific gravity higher than that of the material forming said disk, and at least one of the said cavities located at the opposite side symmetry axis housing a pad or plug of a material having specific gravity lower than that of the material forming said disk.
5. Improved eccentric mass structure according to claim 1, characterized in that said cavities have circular shape.
6. Improved eccentric mass structure according to claim 1, characterized in that said cavities are circular through holes.
7. Improved eccentric mass structure according to claim 1, characterized in that said pads have shape like that of said cavities.
8. Improved eccentric mass structure according to claim 1, characterized in that said pads are permanently forced within said cavities.
9. Improved eccentric mass structure according to claim 1, characterized in that the material of said pads is selected among lead, wolfram and special alloys.
10. Improved eccentric mass structure according to claim 2, characterized in that said plugs are of plastic material, preferably selected among nylon, polyethylene teraphtalate and their mixtures.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT5934490U IT223044Z2 (en) | 1990-05-24 | 1990-05-24 | PERFECTED ECCENTRIC MASS STRUCTURE |
| IT59344B/90 | 1990-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2042499A1 true CA2042499A1 (en) | 1991-11-25 |
Family
ID=11289097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2042499 Abandoned CA2042499A1 (en) | 1990-05-24 | 1991-05-14 | Eccentric mass structure |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH04227891A (en) |
| CA (1) | CA2042499A1 (en) |
| DE (1) | DE4116060A1 (en) |
| ES (1) | ES2044739B1 (en) |
| IT (1) | IT223044Z2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110974468A (en) * | 2019-12-13 | 2020-04-10 | 嘉善万顺达电子有限公司 | Eccentric vibration structure of electric toothbrush |
| TWI697320B (en) * | 2019-12-13 | 2020-07-01 | 大陸商嘉善萬順達電子有限公司 | Vibration structure of electrical toothbrush |
| TWI705799B (en) * | 2019-12-13 | 2020-10-01 | 大陸商嘉善萬順達電子有限公司 | Eccentric vibration structure of electrical toothbrush |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4434221C2 (en) * | 1994-09-26 | 1996-08-29 | Netter Gmbh | Motor-driven unbalance vibrator |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES356941A2 (en) * | 1968-07-23 | 1970-02-16 | Riera Farguell | Improvements in the construction of stationary vibrators. (Machine-translation by Google Translate, not legally binding) |
| US4289042A (en) * | 1978-04-24 | 1981-09-15 | Fmc Corporation | Vibrator with eccentric weights |
| US4614123A (en) * | 1985-01-11 | 1986-09-30 | Global Manufacturing Co, Inc. | Vertical vibrator |
| ES2008534A6 (en) * | 1988-06-07 | 1989-07-16 | Echt Sa | Mechanical vibrator. (Machine-translation by Google Translate, not legally binding) |
| DE8908751U1 (en) * | 1989-07-19 | 1989-10-26 | Westin, Ingrid, 5353 Mechernich | Turbine vibrator |
-
1990
- 1990-05-24 IT IT5934490U patent/IT223044Z2/en active IP Right Grant
-
1991
- 1991-05-10 ES ES9101140A patent/ES2044739B1/en not_active Expired - Lifetime
- 1991-05-14 CA CA 2042499 patent/CA2042499A1/en not_active Abandoned
- 1991-05-16 DE DE19914116060 patent/DE4116060A1/en active Granted
- 1991-05-24 JP JP12035591A patent/JPH04227891A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110974468A (en) * | 2019-12-13 | 2020-04-10 | 嘉善万顺达电子有限公司 | Eccentric vibration structure of electric toothbrush |
| TWI697320B (en) * | 2019-12-13 | 2020-07-01 | 大陸商嘉善萬順達電子有限公司 | Vibration structure of electrical toothbrush |
| TWI705799B (en) * | 2019-12-13 | 2020-10-01 | 大陸商嘉善萬順達電子有限公司 | Eccentric vibration structure of electrical toothbrush |
| US11497591B2 (en) | 2019-12-13 | 2022-11-15 | Jiashan D-Max Electronics Co., Ltd. | Vibration structure of electrical toothbrush |
| US11622842B2 (en) | 2019-12-13 | 2023-04-11 | Jiashan D-Max Electronics Co., Ltd. | Eccentric vibration structure of electrical toothbrush |
Also Published As
| Publication number | Publication date |
|---|---|
| IT9059344V0 (en) | 1990-05-24 |
| DE4116060C2 (en) | 1993-07-15 |
| IT223044Z2 (en) | 1995-06-09 |
| ES2044739A1 (en) | 1994-01-01 |
| IT9059344U1 (en) | 1991-11-24 |
| JPH04227891A (en) | 1992-08-17 |
| DE4116060A1 (en) | 1991-11-28 |
| ES2044739B1 (en) | 1994-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |