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Publication numberUS3637190 A
Publication typeGrant
Publication dateJan 25, 1972
Filing dateAug 15, 1969
Priority dateAug 15, 1969
Publication numberUS 3637190 A, US 3637190A, US-A-3637190, US3637190 A, US3637190A
InventorsIsaacson Max
Original AssigneeVibrodyne Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Vibratory apparatus
US 3637190 A
Abstract
A container is supported by a plurality of spring beams for oscillatory movement on an effective pivot axis offset laterally from a vertical center plane of the container, and a plurality of generally vertical coil springs cooperate with the spring beams to provide the container and the load therein with a resonant frequency of oscillation corresponding substantially to a predetermined excitation frequency. The coil springs are offset laterally from the vertical center plane of the container in spaced relation to the spring beams and are adjustable to provide for substantially maintaining the resonant frequency of oscillation with changes in the load. A cover member is positioned for exerting pressure on the load within the container and in one form is flexible with attached weights and in another form is substantially rigid and hinged to the container.
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States Patet lsaacsnn [54] VIBRATORY APPARATUS [72] Inventor: Max llsaacson, Dayton, Ohio [73] Assignee: Vibrodyne, llnc., Dayton, Ohio [22] Filed: Aug. 15, 1969 [2i] Appl.No.: 850,496

Primary ExaminerRobert W. Jenkins Attorney-Jacox & Meckstroth [57] ABSTRACT A container is supported by a plurality of spring beams for oscillatory movement on an effective pivot axis offset laterally from a vertical center plane of the container, and a plurality of generally vertical coil springs cooperate with the spring beams to provide the container and the load therein with a resonant frequency of oscillation corresponding substantially to a predetermined excitation frequency. The coil springs are offset laterally from the vertical center plane of the container in spaced relation to the spring beams and are adjustable to provide for substantially maintaining the resonant frequency of oscillation with changes in the load. A cover member is positioned for exerting pressure on the load within the container and in one form is flexible with attached weights and in another form is substantially rigid and hinged to the container.

17 Claims, 6 Drawing Figures PATENTED JAMES m2 FIG-4 25 326 M/ VE/V TOR MAX ISAACSON I My 4 TTORNE :5

VIBRA'IORY APPARATUS BACKGROUND OF THE INVENTION The invention relates to a vibratory machine or apparatus as disclosed in lsaacson et al. US. Pat. No. 3,173,664, wherein a container is cantileveredly supported by spring beams for oscillatory movement on an axis offset laterally from a vertical plane extending through the center of the container. In such apparatus, it has been found desirable for some applications to increase the weight of the work load of media within the eontainer without materially increasing the stress on the spring beams and without significantly changing the desired resonant frequency of oscillation of the container and the load, thereby maintaining the most effective operation of the apparatus and the most efficient use of the power means employed for oscillating the container. It has also been found desirable for some applications of the apparatus to obtain a more effective and intense rubbing action between the media and the parts placed within the media so that the time required for surface finishing the parts is significantly reduced.

SUMMARY OF THE INVENTION The present invention is directed to animproved vibratory apparatus of the type including an oscillatory container adapted to receive a work load of media and parts which are to be surface finished. The apparatus provides for supporting the container so that a substantially predetermined resonant frequency of oscillation of the container and the load can be substantially maintained with changes in the weight of the load. The apparatus further provides for using a maximum load of media within the container without overflowing and for exerting pressure on the media to obtain a more intense and effective rubbing action between the media and the parts placed within the media for surface finishing.

In accordance with one embodiment, the container is supported by a plurality of spring beams for oscillatory movement on an effective pivot axis offset laterally from a vertical plane extending through the center of the container. The container is also supported by a plurality of coil springs which are offset laterally from the center plane of the container in a direction opposite to the effective pivot axis. The coil springs are effective to release part of the stress on the spring beams and are adjustable individually so that they can be used to counteract a change of the load within the container as well as for counteracting varying mass distribution of the container and for minimizing distortion of the container when vibrated under a loaded condition, thereby substantially maintaining the predetermined resonant frequency of oscillation of the container and load. The dynamic response of the coil spring or springs is selected conjunctively or in aiding relation with the I spring beams to maintain the predetermined natural frequency of the system regardless of changes of load in the container.

Pressure is applied to the media by a flexible cover member having one edge portion attached to the container and carrying a plurality of weights. In accordance with another embodiment of the invention, the pressure on the media is applied by a substantially rigid cover member having one edge hinged to the corresponding upper edge of the container. The cover members also provide for using a maximum load of media within the container by preventing the overflow of media as it orbits in response to oscillation of the container.

BRIEF DESCRIPTION OF THE DRAWING 34 of no. 2;

FIG. 4 is a fragmentary section taken generally on the line 4-4 ofFlG. 2;

FIG. 5 is a fragmentary section similar to FIG. 3 and showing a modified form of the invention; and

FIG. 6 is a fragmentary section similar to FIG. 1 and showing another modification of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The vibratory apparatus shown in FIG. I includes a base frame 15 having parallel spaced vertical end walls 16 rigidly connected by a cross plate 17, a channel member 18 and a bar 19. The frame 15 is mounted on resilient shock-absorbing feet 21 located at the comers of the frame. A troughlike tub or container 25 is positioned between the end walls I6 of the frame 15 and includes parallel spaced vertical end walls 26 rigidly connected by an intermediate wall having a U-shaped cross-sectional configuration. The container has an outwardly projecting peripheral flange 29, and the walls 26 and 28 and flange 29 are covered with a plastic lining 30 having parallel spaced ribs 31 defining a corrugated inner surface. The lined container walls 26 and 28 define a chamber 35 having a rectangular horizontal configuration and a U-shaped vertical configuration and adapted to receive a work load, for example, a media M of ceramic chips or other abrasive materials and a suspended batch of parts P which are to be surface finished such as by a deburring, polishing or descaling operation. The container 25 is positioned so that a longitudinal plane 37 extending through the center of the chamber 35 is slightly inclined from the vertical.

The container 25 is supported on one side of the center plane 37 by a pair of I-shaped end spring beams 40 which connect the end walls 26 of the container to the end walls 16 of the frame 15. In addition, the corresponding side of the intermediate wall 28 of the container 25 is connected to the frame bar 19 by a plurality of intermediate spring beams 42 which are aligned with the end spring beams 40. The upper end portion of each spring beam 42 is secured by screws to a rail 44 attached to the side of the intermediate wall 28, and the lower end portion of each spring beam 42 is clamped to the frame bar 19 by a plate 43.

On the opposite side of the center plane 37, the container 25 is supported by a plurality of longitudinally spaced coil compression springs 45 which extend between the frame channel 18 and a longitudinally extending angle bracket 47 secured to the adjacent side of the intermediate wall 28 of the container. The lower end of each coil spring 45 seats on a fitting 48 mounted on the upper end of a screw 49 which can be adjusted to vary the upward force exerted by the spring on the container 25.

The spring beams 40 and 42 establish an effective pivot axis 50 for the container 25 and cooperate with the coil springs 45 to provide'the container 25 with a predetermined resonant frequency of oscillation. This resonant. frequency is in the neighborhood of and generally above 3,600 cycles per second when the apparatus is to be operated from a 60-cycle power supply. After the load is placed within the container 25, the coil springs 45 are adjusted so that the resonant frequency of the system including the container, load, spring beams and coil springs, is substantially 3,600 cycles per second.

The container 25 is oscillated by power-operated means including a pair of electromagnets 55 arranged in opposing relation on opposite sides of a barlike armature 56 having ends rigidly connected to parallel spaced plates 58 secured to the intermediate wall 28 of the container 25. Each magnet 55 is mounted on a bracket 60 which is slidably supported by the cross plate I7 and is laterally adjustable by a set of screws 62. Each magnet 55 is adjusted before the container is loaded to form a predetermined uniform gap 61 between the armature 56 and each of the electromagnets 55 according to thedesired amplitude of oscillation. The armature 56 is aligned with the spring beams 40 and 42 so that the gap 61 between the armature and each magnet remains substantially uniform during oscillation of the container 25 when the electromagnets 55 are supplied with variable voltage 60-cycle AC power as men tioned above. When the load is placed within the container 25, the armature 56 moves closer to the magnet 55 on the left (FIG. 1). The adjustment of the coil springs 45, as mentioned above, is effective to return the armature to a position centered between the magnets.

As shown in FIGS. 1-4, a blanketlike cover member 65 extends over the chamber 35 and includes a sheet 66 of flexible resilient material such as rubber which is adapted to rest upon the upper surface of the media M within the container. The flexible sheet 66 is rectangular (FIG. 2) conforming to the shape of the chamber 35 and has a forward portion which is secured by a series of bolts 67 to a channellike clamping bracket 68. A set of longitudinally spaced screws 69 clamp the bracket 68 to the outwardly projecting flange 29 of the container 25 and are each secured by a set of lock nuts 71. The cover member 65 also includes a plurality of elongated weight members or bars 74 which are arranged in parallel spaced relation and as secured to the flexible sheet 66 by a series of bolts 76 (FIG. 4).

In operation, when the container 25 loaded with media M and parts P, is oscillated about the pivot axis 50 in response to energizing of the electromagnets 55, the media and suspended parts orbit in the direction of the arrows 78 (FIG. 1). As a result of the weight of the cover member 65, pressure is exerted on the media M by the cover member 65 and this pressure is transferred to the surfaces of the parts P producing a more intense and effective rubbing action between the media and the parts. The cover member 65 also serves to retain the media and parts within the chamber 35 and thereby prevents overflowing especially when the chamber 35 is substantially full of media.

Referring to FIGS. 5 and 6, another form of cover member 80 includes a substantially rigid rectangular sheet 82 of metal such as steel. The sheet 82 is slightly curved (FIG. 6) and has sufficient thickness and weight to provide a substantial pressure on the media M in the same manner as the weighted cover member 65. The forward longitudinal edge portion of the sheet 82 is connected by a hinge 84 to the channel 68 which is releasably clamped to the outer flange 29 of the container 25. A handle 85 is secured to the opposite edge portion of the sheet 82 and provides for pivoting the cover member to an upright position (not shown) for loading parts or media into the container chamber. In a conventional manner, the media and parts are removed from the chamber through an opening 86 (FIG. 1) within one of the end walls 26 of the container.

Referring to FIG. 6, a modified support of the container 25 includes a pair of end spring beams 40 which are located in laterally offset relation to the center plane 37 of the container 25' in a manner as shown in the above patent. The spring beams 40' define an effective pivot axis 50' for oscillatory movement of the container. In addition to the spring beams 40', the container 25 is supported by a plurality of longitudinally spaced adjustable coil springs 90 which extend between an angle bracket 92 secured to one side of the container wall 28 and a channellike crossmember 94 of the frame The coil springs 90 are offset laterally from the center plane 37' in the same direction as the spring beams 40 but are spaced at a further distance from the center plane 37. On the opposite side of the center plane 37, the container 25' is supported by a plurality of longitudinally spaced adjustable coil springs 45' in a manner similar to the support of the container 25 described above. The coil springs 45 cooperate with the coil springs 90 and the spring beams 50 to support the container 25 and the load therein for oscillation at a resonant frequency corresponding substantially to the predetermined frequency ofexcitation by the electromagnets 55.

From the drawing and the above description, it is apparent that vibratory apparatus constructed in accordance with the present invention provides desirable features and advantages. For example, the auxiliary coil springs 45 cooperate with the spring beams 40 and 42 to support the container 25 for oscillatory movement on the effective pivot axis 50 and prevent overstressing the spring beams 40 and 42 when the container 5 justed so that they exert an increased upward force on the container 25 thereby counteracting the dampening effect of the increased load and retaining the container and the load to the predetermined resonant frequency. As a result, the optimum vibratory energy is obtained from the electromagnets 55 which produce an excitation frequency corresponding substantially to resonant frequency of the container and load.

Moreover, the adjustment of the coil springs 45 with an increased load provides for maintaining equal gaps 61 between the armature 56 and the electromagnets 55. The same advantages are provided by the embodiment shown in FIG. 6. That is, the coil springs 45 and 90 cooperate with the spring beams 40 to support the container 25 and load for oscillation on the effective pivot axis 50' at substantially the predetermined resonant frequency without overstressing the spring beams 40'. When the load in the container 25' is changed, the coil springs 45' and 90 are adjusted to maintain substantially the resonant frequency.

Another important feature of the invention is provided by the cover member 65 or 80. As mentioned above, each cover member is effective toexert a pressure on the media within the oscillatory container so that a more efficient and effective rubbing action is produced between the media and the surfaces of the parts placed within the media. As a result, the time required for surface finishing the parts is significantly reduced. The cover members 65 and also provide for utilizing a maximum load within the container by preventing overflow of the media from the container.

While the forms of apparatus herein described constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise fonns of apparatus, and that changes may be made therein without departing from the scope and spirit of the invention. For example, air spring members might be used in place of the coil springs 45, 45 or 90.

What is claimed is:

l. Vibratory apparatus comprising a frame, a container defining a chamber adapted to receive a load to be vibrated, means mounted on said frame and supporting said container for oscillatory movement on a predetermined effective axis offset laterally in relation to a generally vertical plane extending through the center of said container, said supporting means including spring means being effective to provide said container and the load therein with a resonant frequency corresponding generally to a predetermined frequency, poweroperated means for oscillating said container at substantially said predetermined frequency to cause orbital movement of the load within said chamber, cover means for said container and extending over at least a portion of said chamber, and means positioning said cover means for engaging the load within said chamber to apply pressure on the load as it is being orbited.

2. Vibratory apparatus as defined in claim 1 wherein said cover means comprise a flexible cover member, and means for connecting a portion of said cover member to said container.

3. Vibratory apparatus as defined in claim 2 including weight means secured to said cover member to increase the effective weight of said cover member and the corresponding pressure on the load within said chamber.

4. Vibratory apparatus as defined in claim 1 wherein said cover means comprise a substantially rigid cover member, and hinge means connecting said cover member to said container.

5. Vibratory apparatus as defined in claim 1 wherein said container is generally U-shaped in vertical cross section, said means for positioning said cover means comprise a connection between said cover means and said container, and said connection being laterally offset from said plane in a direction opposite to that of said effective pivot axis.

6. Vibratory apparatus as defined in claim 1 wherein said spring means include at least one spring beam connecting said container to said frame and defining said effective pivotaxis, and said spring means further include at least one coil spring laterally offset from said plane in a direction opposite to that of said effective pivot axis.

'7. Vibratory apparatus as defined in claim 6 including means for adjusting the force exerted by said coil spring on said container to compensate for a change in the load within said chamber for maintaining substantially said resonant frequency of oscillation of said container and the load therein.

8. Vibratory apparatus as defined in claim 6 wherein said spring means further include at least one coil spring offset laterally from said plane in the same direction as said pivot axis and being located at a greater distance from said plane than said pivot axis for cooperating with said coil spring on the opposite side of said plane to reduce the load supported by said spring beam.

9. Vibratory apparatus comprising a frame, a container defining a chamber adapted to receive a load to be vibrated, at least one spring beam mounted on said frame and supporting said container for oscillatory movement on an effective axis offset laterally in relation to a generally vertical plane extending through the center of said container, at least one spring member connecting said frame to said container and spaced from said effective axis generally parallel with said plane to produce a restraint on said container in a direction substantially opposite to gravity, said spring beam and said spring member cooperating to support said container and the load therein for oscillation above said axis at a resonant frequency corresponding substantially to a predetermined frequency, and poweroperated means for oscillating said container at substantially said predetermined frequency to cause orbital movement of the load within said chamber.

10. Vibratory apparatus as defined in claim 9 including means for adjusting the force exerted on said container by said spring member according to the load within said chamber for substantially maintaining said resonant frequency of oscillation when the load within said container is changed.

11. Vibratory apparatus as defined in claim 9 including a plurality of substantially aligned said spring beams and a plurality of substantially aligned spring members arranged in substantially parallel spaced relation.

12. Vibratory apparatus as defined in claim 1] and further including a plurality of generally aligned spring members connecting said frame to said container and spaced laterally from said plane in the same direction as said effective pivot axis and at a greater distance from said plane than said pivot axis.

13. Vibratory apparatus as defined in claim 9 including cover means for said container and extending over at least a portion of said chamber, and means positioning said cover means for engaging the load within said chamber to apply pressure on the load as it is being orbited.

l4. Vibratory apparatus as defined in claim 9 wherein said spring member comprises a coil spring.

15. Vibratory apparatus comprising a frame, a container having a U-shaped cross-sectional configuration and defining a chamber adapted to receive a load to be vibrated, a plurality of generally vertically extending spring beams mounted on said frame and supporting said container for oscillatory movement on an effective pivot axis offset laterally in relation to a generally vertical plane extending through the center of said container, a plurality of generally vertically extending coil springs connecting said frame to said container and spaced from said plane in a direction opposite to that of said effective pivot axis, said spring beams and said coil springs supporting said container and the load therein for oscillation above said pivot axis at a resonant frequency corresponding generally to a predetermined frequency, a pair of electromagnets disposed in opposed spaced relation, an armature member connected to said container and extending between said electromagnets and defining substantially uniform and equal gaps between said arrnature member and said electr-ornagnets said electromagnets being effective to oscillate said container at substantially said predetermined frequency to cause orbital movement of the load within said chamber, and means for adjusting the force exerted on said container by said coil spring for substantially maintaining said gaps between said armature and said electromagnets and for substantially maintaining said resonant frequency when the load within said container is changed.

16. Vibratory apparatus as defined in claim 15 including cover means for said container and extending over at least a portion of said chamber, and means positioning said cover member for engaging the load within said chamber to apply pressure on the load as it is being orbited.

17. In vibratory apparatus including a frame, a container defining a chamber adapted to receive a load to be vibrated, a plurality of spring beams mounted on said frame and supporting said container for oscillatory movement on an effective axis offset laterally in relation to a generally vertical plane extending through the center of said container, said spring beams supporting said container and the load therein for oscillation at a resonant frequency corresponding substantially to a predetermined frequency, and means for oscillating said container at substantially said predetermined frequency to cause orbital movement of the load within said chamber, the improvement comprising auxiliary spring means connecting said frame to said container in spaced relation to said effective axis, and means for adjusting the force exerted by said spring means on said container for substantially maintaining said resonant frequency of oscillation when the load within said container is changed.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3163966 *Jan 23, 1962Jan 5, 1965Pangborn CorpVibratory finishing
US3173664 *Jul 1, 1963Mar 16, 1965IsaacsonVibrator
US3183630 *Nov 4, 1963May 18, 1965Wright Royal KRock polishing machine
US3213568 *Jul 18, 1961Oct 26, 1965Wheelabrator CorpCorrugated bowl lining for vibrators
US3248826 *Apr 22, 1963May 3, 1966Wheelabrator CorpMethod for the finishing of parts
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3769758 *Jun 28, 1971Nov 6, 1973Mc Donald JVibratory stone polisher
US3774888 *May 28, 1971Nov 27, 1973Vibrodyne IncVibratory apparatus
US3792552 *Nov 22, 1971Feb 19, 1974Vibrodyne IncVibratory apparatus for treating a continuous supply of parts
US3812625 *Mar 13, 1972May 28, 1974W OlsonVibrating rock polisher
US3978623 *Aug 16, 1974Sep 7, 1976Geode Industries, Inc.Apparatus for vibratory polishing of stones and the like
US4051830 *May 11, 1976Oct 4, 1977Cincinnati Milacron, Inc.Wheel dressing apparatus and method
US4105012 *Oct 19, 1977Aug 8, 1978Siemens AktiengesellschaftApparatus for cutting up hard and brittle material
US5460566 *Feb 11, 1993Oct 24, 1995Drilltech Technologies, Inc.Vibrating abrasive cleaning apparatus and method
US5591074 *Apr 19, 1995Jan 7, 1997General Kinematics CorporationVibratory tumbling apparatus with reduced force transmission
US5743790 *Jul 25, 1995Apr 28, 1998Drilltech Technologies, Inc.Vibrating abrasive cleaning apparatus and method
US6508582 *Dec 21, 2000Jan 21, 2003Union Scientific CorporationElectromagnetic vibratory microplate shaker
US6585577Oct 17, 1997Jul 1, 2003Drilltec Patents & Technologies Co., Inc.Vibrating abrasive cleaning apparatus and method
US6659637Oct 3, 2001Dec 9, 2003Union Scientific CorporationVertical electromagnetic shaker for biological and chemical specimens
US6879067Jun 9, 2000Apr 12, 2005Phillips D. RockwellOrbital vibrator
US8016218Mar 16, 2011Sep 13, 2011Mitchell FriedmanLinear specimen shaker
EP0386872A1 *Jan 22, 1990Sep 12, 1990General Kinematics CorporationVibratory tumbling apparatus
WO1996035549A1 *May 9, 1995Nov 14, 1996Drilltec Patents & TechVibrating abrasive cleaning apparatus and method
Classifications
U.S. Classification366/111, 451/326, 451/35
International ClassificationB01F11/00
Cooperative ClassificationB01F11/0094
European ClassificationB01F11/00P
Legal Events
DateCodeEventDescription
Jul 23, 1984AS02Assignment of assignor's interest
Owner name: TAILORED SYSTEMS, INC., 2853 SPRINGBORO WEST, DAYT
Effective date: 19840618
Owner name: VIBRODYNE, INC., AN OH CORP.
Jul 23, 1984ASAssignment
Owner name: TAILORED SYSTEMS, INC., 2853 SPRINGBORO WEST, DAYT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VIBRODYNE, INC., AN OH CORP.;REEL/FRAME:004282/0393
Effective date: 19840618