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Publication numberUS3671785 A
Publication typeGrant
Publication dateJun 20, 1972
Filing dateJul 12, 1971
Priority dateJul 12, 1971
Publication numberUS 3671785 A, US 3671785A, US-A-3671785, US3671785 A, US3671785A
InventorsFuchs Richard C, Sukow Daniel L, Wilke Dennis P
Original AssigneeOster Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric vibratory massager
US 3671785 A
Abstract
An improved electric hand-held vibratory massager is disclosed in which the brush holders for the massage are made of plastic, and the connectors for supplying electricity to the brushes are integrally molded into the plastic brush holders. The input power line is connected to the base of the massager and the electrical leads from the brush holders to the base pass through the vibratory spring that supports the motor on the base and then down through the standard that supports the spring whereby the amount of strain that the lead wires to the brushes must withstand is substantially reduced.
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Description  (OCR text may contain errors)

United States Patent Fuchs et al.

[ 1 June 20, 1972 [54] ELECTRIC VIBRATORY MASSAGER [72] Inventors: Richard C. Fuchs, Milwaukee; Daniel L.

Sukow, Grafton; Dennis P. Wilke, Milwaukee, all of Wis,

[73] Assignee: Oster Corporation, Milwaukee, Wis.

[22] Filed: July 12, 1971 [21] Appl No.: 161,483

52 U.S.Cl ..310/50,3l0/81,310/247, 128/36 51 1m.c1. ..l-l02k7/06 5s FieldofSearch ..3l0/8l,7l,238,239,247, 310 47, 50; 128/36; 259 1310. 41

[56] References Cited UNITED STATES PATENTS 2,181,282 11/1939 Oster ..l28/36 2,773,209 12/1956 Kirkwood ..3 l 0/247 Primary Examiner-D. X. Sliney Attorney-George R. Clark 5 7] ABSTRACT An improved electric hand-held vibratory massager is disclosed in which the brush holders for the massage are made of plastic, and the connectors for supplying electricity to the brushes are integrally molded into the plastic brush holders. The input power line is connected to the base of the massager and the electrical leads from the brush holders to the base pass through the vibratory spring that supports the motor on the base and then down through the standard that supports the spring whereby the amount of strain that the lead wires to the brushes must withstand is substantially reduced.

16 Claims, 7 Drawing Figures P'A'TENTEDmzo m2 3.671.785

sum 3 or 3 jyZa 136 1,6? 150 172 fig 1365 jgyenfons ZMQZ C (7w M g/W ELECTRIC VIBRATORY MASSAGER BACKGROUND OF THE INVENTION The present invention is directed to improvements in handheld vibrator massagers and to improved brush holders for electric motors which may be used in such vibrators. Handheld vibrators in which the motor is suspended between the front and rear supports'or standards on a base have been commercially available for many years. In this type of massager the motor housing commonly has a flexible connection with the rear support through a coiled spring which is partially supported by the rear standard and is biased against the rear end of the motor housing. The front end of the motor commonly carries an eccentric cam which projects into a bearing carried by the front standard. The vibratory motion that is produced by the eccentric cam is largely confined to the front portion of the base and is transmitted to the fingers of the operators hand. The rear end of the motor is allowed to swivel because of the action of the stiff, tightly-coiled axial spring.

In the described type of massager it is common to provide electrical input power through a power cord that is coupled to the base of the massager which houses an on-off switch. The electrical input power supplied to the motor is commonly provided by an external power cord which is coupled from the base to the side of the motor. The size of the external cord that is required to couple power from the base to the motor must be relatively large due to the strain that may be put on the cord even though this large size wire is not necessary to supply the required amount of electrical power to the motor. This large cord is relatively costly and detracts considerably from the appearance of the massager. In the present invention this external power connection has been eliminated, thereby reducing the cost of the massager and improving the appearance of the massager.

The massager of the present invention also utilizes improved brush holders which are easy to assemble, relatively inexpensive, rugged in construction and reliable in use.

It is, therefore, an object of the present invention to provide a reliable, rugged brush holder which may be readily mounted on the frame for the motor and which has provisions for easy removal and insertion of the brushes.

It is another object of the present invention to provide a brush holder which is made of plastic and which consists of two integral parts into which the connectors for supplying electricity to the associated brush through a conductive spring are molded, whereby the assembled brush holder consists of the brush, the conductive spring, the body of the holder and a cap which is screwed into the body of the holder.

It is a further object of the present invention to provide an improved electrical lead-in from the base of a massager to the motor of the massager which is mounted on front and rear standards that extend upwardly from the base in which the electrical leads from the base to the motor pass through a ho]- low channel in the rear standard, through a coiled spring that extends between the rear standard and the rear end of the motor housing and then to the brush holder.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the massager of the present invention;

FIG. 2 is a cross sectional view of the massager taken along the line 2-2 of FIG. 1;

FIG. 3 is a top sectional view of the massager taken along the line 33 of FIG. 2;

FIG. 4 is a cross sectional view showing the front bearing bracket of the motor and the flux return ring for the motor which is taken along line 4-4 of FIG. 3;

FIG. 5 is a cross sectional view showing the rear bearing bracket, the brush holders and the flux return ring which is taken along the line 5-5 of FIG. 3;

FIG. 6 is an enlarged sectional view which is taken along the line 6-6 of FIG. 3 which shows a cross sectional view of the tube portion of the brush holder;

FIG. 7 is a cross sectional view showing the commutator of the motor and the assembled brush holder which is taken along the line 7-7 of FIG. 6.

TECHNICAL DESCRIPTION OF THE INVENTION The massager 10 of the present invention which is shown generally at 10, includes a motor housing 12 which is supported by a front standard 14 and a rear standard 16. The standards 14 and 16 are integrally formed with the base 18. The massager has a number of springs 20 which fit over the operators hand. The springs 20 are secured to a metal closure plate 22 which is in turn secured to the base 18. The operator inserts his fingers between the springs 20 and the resilient pad 24, which may be made of neoprene sponge rubber pad or other suitable resilient material. The pad 24 makes operation of the massager more comfortable to the operator. In operation vibratory motion is thereby imparted to the operators hand through the base 18 and the pad 24.

The rear standard 16 supports one end of a tightly coiled stiff spring 26, the other end of the spring being inserted into the motor housing 12 through an aperture 28 in the rear plate 30 of the motor housing 12. The motor shaft 32 is threaded at the front end and, it carries an eccentric 34 which is screwed onto the end of the threaded shaft 32. The eccentric 34 includes a crank pin or eccentric bearing 34a which projects into a set of roller bearings 36 which is press fit into an aperture 38 in the front standard 14.

Enclosed within the housing 12 is a motor 70, the front end of which is supported by the roller bearing 36 which journals the eccentric bearing 34a on the front end of the motor shaft 32. The rear end of the motor 70 is carried by the spring 26 which is positioned axially with respect to the motor 12 and is supported between the rear plate 30 of the motor and the rear standard 16. The motor housing 12 is thereby suspended between the front standard 14 and the rear standard 16. As the motor shaft 32 rotates, the slightly eccentric mounting of the eccentric bearing 34a on the motor shaft 32 produces an orbital motion of the front end of the motor 70. This results in the transmission of vibratory motion to the base 18. The coil spring 26 allows the motor 12 to swivel such that the transmission of vibratory motion to the base 18 is largely concentrated at the front portion of the massager 10. The eccentric bearing 34a is crowned so that it may wobble somewhat within the roller bearing during operation of the massager. A thrust washer 33, which is preferably made of graphite impregnated plastic surrounds the eccentric bearing 34a and bears against the roller bearing 36.

The coiled spring 26 rests on a U-shaped ledge 40 which is formed in the rear standard 16. A removable U-shaped bracket 42 is secured over the top of the coiled spring 26 by screws 43 to hold the spring in place on the ledge 40. A decorative cap 46 may be inserted over the from standard 14 to provide a pleasing appearance if desired. The decorative cap 46 has a slotted aperture 48 which allows the upper end of the front standard 14 to pass into the cap 46 which is secured to the standard 14 by means of screws 50.

The base 18 has downwardly depending longitudinal sides 52 and end sides 54. The metal plate 22, which is secured to the springs 20 by means of the rings 20a and the brackets 22a, in conjunction with the sides 52 and 54 forms an enclosure 66. The plate 22 is secured into place by means of the screws 56 and 58 which are screwed into the threaded screw receiving bosses 60 and 62 that extend downwardly from the upper surface 64 of the base 18. The conventional electrical connections for the massager including a rectifier diode (not shown) are housed within the enclosure 66. A resilient foam pad 68 may also be inserted into the enclosure so that the electrical interconnection wires and rectifier diode in the base will be pressed upwardly into engagement with the under side of the surface 64 in order to lessen bending or movement of the interconnecting wires and the diode when the massager is being used.

The motor 70, which is housed in the motor housing 12, is supported at its front end by a bearing 72 which is secured in the aperture 74 in the front bearing bracket 76. The bearing 72 is preferably a bearing which has been impregnated with oil. The bearing 72 is held in the aperture 74 by means of the bearing retainer 78 which is secured to the front bearing bracket 76 by means of the screws 80. An oil retaining wick 82 preferably encloses the bearing 72 to receive oil leakage from the bearing 72.

The rear end of the armature shaft 32 extends beyond the commutator 84 and is supported by a similar bearing 86 which is inserted into an aperture 88 in the rear bearing bracket 90. The bearing 86 is held into place by the bearing retainer 92, which is secured against the rear bearing bracket 90 by means of the screws 94, circular oil wick 96 also surrounds the rear bearing 86. The rear end plate 30 of the motor is secured to the motor housing 12 by the screws 94 which pass through the rear bearing bracket 90 into the threaded posts 98 which extend inwardly from the rear end section 30. The rear end section 30 has openings 100 for allowing the passage of cooling air along the motor in the direction shown by the arrows in FIG. 2, and out through the forward opening 102 in the front part of the motor housing 12.

As best shown in FIG. 3 the front bearing bracket 76 is secured to the front end of the motor housing 12 by means of the screws 104 and 106. The motor 70 has a flux return ring 108 which has an outside surface 108a that conforms substantially to the elliptical inner surface 12a of the motor housing 12. The flux return ring 108 has two smaller arcuate magnets 110 and 112 which are bonded to the circular inner surface 108b of the return ring 108. The combination of the arcuate magnets 110 and 112 and the outer portion 118 of the flux ring 108 combine to give the desired magnetic field configuration. The flux return ring 108 is secured to the front bearing bracket 76 and to the rear bearing bracket 90 by means of the screws 120 and 122 which screw into the rear bearing bracket 90.

It has been common practice in applying electrical power to the brushes of a vibrator of the general type described herein to couple an external cable from the base 18 through the side of the motor housing 12 in order to supply electricity to the motor brushes. An external connection such as this requires a relatively large wire since for the safety of the operator it must be capable of withstanding a relatively large strain. Mounted within housing 12 and cooperating with the commutator 84 are a pair of radially extending brushes 130 and 132 which are slidably received in brush holders 134 and 136 respectively. In accordance with the present invention as shown best in FIGS. 3 and 5, leads 126 and 128 are provided for supplying electrical power to the brushes 130 and 132. The leads 126 and 128 pass from the brush holders 134 and 136 through the channels 138 and 140 that are provided in the rear bearing bracket 90 between the rearwardly extending projections 142 which are integrally formed with the rear bearing bracket 90. The leads 126 and 128 then pass through the opening 144 in the rear plate 30 of the motor housing 12 and proceed along the axis of the coil spring 26 inside of a tubular insulating member 146 that is inserted inside the coil spring 26. As shown in FIG. 2 the leads 126 and 128 then pass downwardly into a hollow channel 16a of the rear standard 16. The hollow channel 16a in the rear standard 16 opens into the enclosure 66 and the lead 128 is connected to the terminal 62 of the switch 17 while the lead 126 is coupled to the rectifier diode. By coupling the leads 126 and 128 from the base 18 to the motor 70 in this manner the need for providing external interconnecting wires that are considerably larger than required to meet the electrical power requirements of the motor is eliminated.

The brushes 130 and 132 which contact the commutator 84 are housed in the brush holders 134 and 136, respectively. The brush holders 134 and 136 have smooth tapered sides 148 which allow the brush holders 134 and 136 to be secured in place in the apertures 150 and 152, respectively, in the rear bearing bracket 90 merely by a pressure fit. The construction of the brush holders 134 and 136 is best shown in FIGS. 6 and 7. Only the brush holder 136 will be described herein since the brush holder 134 is constructed in a similar manner. The brush holders 134 and 136 are preferably formed of a plastic such as polycarbonate, which is somewhat resilient, so that the holders may be pressed into place in the rear bearing bracket by a slight downward pressure and such that they may easily be moved from the rear bearing by a somewhat greater outward pressure on the brush holder.

The brush holder 136 has a tube portion 136a which is provided with a square axial bore 154 into which the associated square-shaped brush 152 is inserted. The brush holder may, of course, have different bore shapes such as cylindrical, for example, as required to conform to the shape of the brush. The brush holder 136 includes a cap 136b which has external threads 156 that are screwed into the internal threads 158 which are formed in the tube portion 136a.

As is best shown in FIG. 6 the tube portion 136a is molded around the connector 174 during manufacture. The tube portion 136a has a square aperture therein for receiving the square-shaped brush 132. The connector 174 also has a terminal portion 160 with a first lug 162 which is crimped or soldered over the end 126a of the lead 126 to provide electrical connection to the connector 174. The terminal portion 160 also has a second lug 164 which is crimped over an insulated portion of the wire 126 to hold the wire 126 in place. The lugs 162 and 164, a portion of the lead 126, the terminal portion 160 are all molded into the tube portion 136a of the brush holder 136 with only a small portion of the connector 174 being exposed, as shown in FIG. 6, for making electrical connection to the conductive spring 178. The lead 126 projects from the brush holder 136 through the aperture 166 in the side of the molded tube portion 136a.

The cap 136b has a U-shaped connector 168 which is molded into the cap portion during manufacture so that the surface 180 of the connector 168 is exposed. The connector 168 also has an exposed end portion 170 which extends outwardly from the inner surface of the cap 172 so that it contacts the exposed inner surface 176 of the connector 174, thereby electrically connecting the connector 174 and the connector 168. When the cap 136b is screwed into the tube portion 136a, it may be screwed only far enough to allow contact between the connectors 168 and 174, and a small gap will remain between the surface of the connector 168 and the surface 176 of the connector 174.

Electrical connection is completed to the brush 132 by an electrically conducive spring 178 which is secured over a reduced portion 132a of the bnish 132. The outer end of the spring 178 is pressed against the exposed surface 180 of the connector 168. In this manner the electrical connection from the lead 126 is completed through the connectors 168 and 174, the conductive spring 178 and the brush 132 to the commutator 84.

With the brush holders of the present invention the connectors 168 and 174 can not be incorrectly inserted into the brush holder when the brushes must be changed since they are completely molded into the brush holder during manufacture. In addition, by molding the connector 174 into the tube portion 136a of the brush holder and by securing the end of the leads in the brush holders, in the manner shown, the danger of having connecting leads break is minimized. Thus an easily assembled, reliable, rugged and relatively inexpensive brush holder is provided.

What is claimed is:

1. A vibratory massager comprising a base having a base enclosure therein, a motor housing having a front end and a rear end, a front standard extending upwardly from said base for supporting said front end, a rear standard extending upwardly from said base for supporting said rear end of said motor housing, said rear standard having a hollow channel therein in communication with said base enclosure, an electric motor having an axial drive shaft, means for supporting said motor in said housing, a plurality of brushes for supplying electrical energization to said motor, a plurality of brush holders supported by said motor, each of said brush holders constructed to contain one of said plurality of brushes, bearing means in said front standard, cam means secured to the front end of said motor shaft, said cam means being positioned in operative engagement with said bearing means, spring means having a front end and a rear end, said spring means being in alignment with said motor drive shaft and having a hollow passageway therethrough, the rear end of said spring means being supported by said rear standard and the front end of said spring means extending into an aperture in the rear end of said motor housing, the passageway through said spring means being in communication with said hollow channel in said rear standard and with the interior of said motor housing, control means mounted in said base enclosure for controlling energization of said electric motor, an electrical input cord coupled to said base for supplying electrical input energy to said control means, a plurality of electrical leads, each of said leads being coupled to one said plurality of electrical brushes and passing from its associated brush holder through the aperture in the rear end of saidmotor housing, through said passageway in said spring means and down through said hollow channel in said rear standard into said base enclosure where said electrical leads are electrically coupled to said control means.

2. A vibratory massager as claimed in claim 1 wherein said spring means is a tightly coiled axial spring and a tubular member constructed of an electrically insulated material is inserted into said spring so that said passageway for said electrical leads is formed through said tubular member.

3. A vibratory massager as claimed in claim 1 wherein said axial drive shaft of said motor is supported at its front end by means of a front bearing retained in a front bearing bracket and said motor shaft is supported on its rear end by means of a rear bearing retained in a rear bearing bracket, said front and rear bearing brackets being secured to the front and rear ends of said motor housing, respectively, said rear bearing bracket being constructed so as to have a plurality of projections which provide independent channels for each of said electrical leads.

4. A vibratory massager as claimed in claim 3 wherein said spring means is a tightly coiled axial spring and a tubular member constructed of an electrically insulated material is inserted into said spring so that said passageway for said electrical leads is formed through said tubular member.

5. A brush holder for supplying electrical energization to the commutator of an electrical motor which utilizes brushes that each have an electrically conductive spring in engagement therewith for biasing said brush into contact with said commutator, comprising a tube section of a moldable material having a bore therethrough for receiving said brush and said spring, a first electrical connector molded into said tube section, said first connector having an interconnecting tab for connecting an electrical input lead to said first connector, said first connector and said interconnecting tab being molded into said tube section such that said interconnecting tab is completely molded into said tube section and such that only a portion of said first connector is exposed in said bore, said tube section and said cap section having means for securing said tube section and said cap section together, a U-shaped second connector molded into said cap section such that the ends and a portion of the base of said second connector are exposed, said ends of said second connector being positioned so as to be in contact with an exposed portion of said first connector when said tube section and said cap section are secured together, said second connector being disposed when said tube section and said cap section are secured together so as to contact the conductive spring of its associated brush wherein electrical connection is completed from the electrical lead that is connected to the interconnecting tab of the saidfirst connector, through said first connector, said second connector, said conductive spring and said brush inserted in said bore of said associated brush holder to the commutator of said motor.

6. A brush holder as claimed in claim 5 wherein said brush holder is constructed of plastic and has slightly sloped sides, said plastic being somewhat resilient so that said brush holder may be press-fit into an aperture in a supporting member.

7. A vibratory hand massager comprising a base having a base enclosure, a motor housing, a support means for said motor housing having a hollow channel in communication with the said base enclosure, an electrical motor, means for supporting said motor in said motor housing, means for supplying vibratory motion to said base when said motor is energized, a coiled spring for allowing swivelling action of one end of said motor housing, said coiled spring having a passageway therethrough which is in communication with said channel in said support means, control means in said base enclosure for controlling energization of said electric motor, means for supplying electrical input power to said control means, a plurality of electrical brushes supported by said motor for supplying electrical energization to said electrical motor, a plurality of electrical leads electrically coupled to said control means and passing through said hollow channel in said support means, through said passageway in said coiled spring and through an aperture in said motor housing to said electrical brushes for supplying electrical energization thereto.

8. A vibratory massager as set forth in claim 7 wherein said spring is a tightly coiled axial spring and a tubular member constructed of an electrically insulated material is inserted into said spring so that said passageway for said electrical leads is formed through said tubular member.

9. A vibratory massager as claimed in claim 7 wherein said motor has an axial drive shaft and said drive shaft is supported at its front ends by means of a front bearing retained in a front bearing bracket and said motor shaft is supported at its rear end by means of a rear bearing retained in a rear bearing bracket, said front and rear bearing brackets being secured to the front and rear ends of said motor housing, respectively, said rear bearing bracket being constructed so as to have a plurality of projections which provide independent channels for each of said electrical leads.

10. A vibratory massager as claimed in claim 9 wherein said spring is a tightly coiled axial spring and a tubular member constructed of an electrically insulated material is inserted into said spring so that said passageway for said electrical leads is formed through said tubular member.

ll. A vibratory massager comprising a base having a base enclosure, a motor housing, a motor, means for supporting said motor in said motor housing, means for supporting said motor housing on said base, means for supplying vibratory motion to said base when said motor is energized, a plurality of electrical brushes for supplying electrical energization to said motor, control means in said base enclosure for controlling the energization of said motor, an electrical input cord coupled to said base enclosure for supplying electrical input power to control means, an enclosed passageway leading through said massager from said control means into the interior of said motor housing and a plurality of electrical leads running through said enclosed passageway for providing electrical interconnection between said control means and said electrical brushes.

12. A vibratory massager as claimed in claim 11 comprising a brush holder support member wherein said brushes are each held by a brush holder, supported by said brush holder support member, said brush holders each comprising a tube section and a cap section, said tube section comprising a first connector molded therein with exposed connection portions, said cap section comprising of second connecter molded therein, with exposed connection portion, said tube and cap sections having means for securing said sections together which provides an electrical connection between the exposed connection portions of said first and second connectors to a conductive spring in said associated brush holders which has one end in contact with said second connector and its other end in contact with the associated brush.

. 13. A vibratory massager as claimed in claim 12 wherein said brush holders are constructed of plastic and have slightly sloped sides, said plastic being somewhat resilient so that said brush holders may be press-fit into apertures in said supporting member.

14. A vibratory massager as claimed in claim 11 wherein said motor has an axial drive shaft and said drive shaft is supported at its front end by means of a front bearing retained in a front bearing bracket and said motor shaft is supported at its rear end by means of a rear bearing retained in a rear bearing bracket, said front and rear bearing brackets being secured to the front and rear ends of said motor housing, respectively, said rear bearing bracket being constructed so as to have a plurality of projections which provide independent channels for each of said interconnecting leads.

15. A vibratory massager as claimed in claim 14 wherein said rear bearing bracket acts as a brush holder support member and said brushes are each held by a brush holder supported by said brush holder support member and said brush holders are constructed of plastic and have slightly sloped sides, said plastic being somewhat resilient so that said brush holders may be press-fit into apertures in said rear bearing brackets.

16. A vibratory massager as claimed in claim 15 wherein said brushes are each held by a brush holder secured in an aperture in said rear bearing bracket, said brush holders each comprising a tube section and a cap section, said tube section comprising a first connector molded therein with exposed connection portions, said cap section comprising of second connector molded therein, with exposed connection portion, said tube and cap section having means for securing said sections together which provides an electrical connection between the exposed connection portions of said first and said second connectors to a conductive spring in said associated brush holders which has one end in contact with said second connector and its other end in contact with the associated brush.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2181282 *Dec 9, 1937Nov 28, 1939Oster John Mfg CoVibrator
US2773209 *Apr 14, 1955Dec 4, 1956Kirkwood William PCarbon brush holder
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4025809 *Mar 8, 1976May 24, 1977Kabushiki Kaisha Teranishi Denki SeisakushoMassaging vibrator
US4465949 *Aug 22, 1983Aug 14, 1984Knauff Robert JElectromechanical frequency generator-modulator kinetic storage device
US4709362 *Sep 27, 1985Nov 24, 1987Conoco Inc.Oscillating orbital vibrator
US5125398 *May 30, 1991Jun 30, 1992Horton Azor RPersonal hygienic massage bar
US5183034 *Dec 23, 1991Feb 2, 1993Kabushiki Kaisha Japan HealthPortable vibration finger pressure massager
US5601529 *Apr 17, 1995Feb 11, 1997Hwe, Inc.Finger massage apparatus
US6179331Feb 5, 1999Jan 30, 2001Mattel, Inc.Children's ride-on vehicle having a vibrating engine model
US20050143679 *Dec 29, 2003Jun 30, 2005Gelber Mitchell L.Massage glove
Classifications
U.S. Classification310/50, 310/81, D24/215, 310/247, 601/74
International ClassificationH02K7/14, H02K5/14
Cooperative ClassificationH02K7/145, H02K5/148
European ClassificationH02K7/14B, H02K5/14C3