CA1124298A - Drive unit for flexshaft vibrators - Google Patents
Drive unit for flexshaft vibratorsInfo
- Publication number
- CA1124298A CA1124298A CA333,902A CA333902A CA1124298A CA 1124298 A CA1124298 A CA 1124298A CA 333902 A CA333902 A CA 333902A CA 1124298 A CA1124298 A CA 1124298A
- Authority
- CA
- Canada
- Prior art keywords
- shell
- end closure
- housing
- closure portions
- shaft
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/08—Insulating casings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
- H02K7/145—Hand-held machine tool
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
Docket No. 9038 DRIVE UNIT FOR FLEXSHAFT VIBRATORS
Abstract of the Disclosure A drive motor for a flexible drive shaft of an internal vibrator or some other device potentially the source of an electrical shock features a cylindrical structure embodying a field assembly which slip fits in a cylindrical shell which embodies positioning means to which the field assembly and electrically connected commutator brush means may be releas-ably fixed. Slip fit as a unit into this shell is an arma-ture assembly including a commutator means fixedly mounted directly to and about shaft means intermediate its ends.
One end portion of the shaft means provides an electrically non-conductive coupling device for drivingly relating the shaft means to a device which must be powered. The shaft means has affixed thereto the inner races of bearing means to either end of the armature assembly the outer races of which are in direct contact with and protected by electri-cally non-conductive material forming part of end covers for said cylindrical shell. The end covers are slotted and fan blade means are fixed directly to said shaft means to produce a cooling flow of air about the drive unit com-ponents. The drive unit also embodies rubber,electrically non-conductive,motor mounts ring-shaped base portions of which seat about and are contained to the shell by electri-cally non-conductive end covers. Projecting radially from the ring-shaped base portions are arms spaced by tube elements which provide electrically insulated hand holds for said drive unit between and clear of said end covers.
Abstract of the Disclosure A drive motor for a flexible drive shaft of an internal vibrator or some other device potentially the source of an electrical shock features a cylindrical structure embodying a field assembly which slip fits in a cylindrical shell which embodies positioning means to which the field assembly and electrically connected commutator brush means may be releas-ably fixed. Slip fit as a unit into this shell is an arma-ture assembly including a commutator means fixedly mounted directly to and about shaft means intermediate its ends.
One end portion of the shaft means provides an electrically non-conductive coupling device for drivingly relating the shaft means to a device which must be powered. The shaft means has affixed thereto the inner races of bearing means to either end of the armature assembly the outer races of which are in direct contact with and protected by electri-cally non-conductive material forming part of end covers for said cylindrical shell. The end covers are slotted and fan blade means are fixed directly to said shaft means to produce a cooling flow of air about the drive unit com-ponents. The drive unit also embodies rubber,electrically non-conductive,motor mounts ring-shaped base portions of which seat about and are contained to the shell by electri-cally non-conductive end covers. Projecting radially from the ring-shaped base portions are arms spaced by tube elements which provide electrically insulated hand holds for said drive unit between and clear of said end covers.
Description
Docket No. 9038-1 l~.Z4298 Background of the Invention . _ This invention relates to improvements in motor drive drive units particularly those which must be hand held in use. Such units have special advantage for drive of a flexible shaft of an internal vibrator or for that matter drive of any device which in use may be a source of electri-cal shock to the holder or manlpulator of the drive unit.
Much time, money and labor has been applied in efforts to render drive units such as above described safer in use.
- Efforts have likewise been applied to render such units simpler in construction, easier to fabricate and assemble and adaptable to use in a variety of potentially dangerous environments and lighter in weight. While prior device~
applied to similar purposes have been developed with some improvement in the area of concern, they have not been so designed as to satisfy the noted criteria, the target and achievement of embodiments of the present invention.
The prior art of which the present inventors are aware comprise the following U.S. Patents:
Holther, Jr. 3,894,254 Masont Jr. 3,188,054 Wyzenbeek 3,180,625 Pratt 3,344,291 Batson et al 3,462,623 Hult 3,760,209 Adair 4,059,898 1~.24298 Serial NO. 333,902 - 2 SU~MARY OF THE INVENTION:
.
The present invention provides a drive motor of the type descxibed which is light in weight, comprised of minimal structure, easy to assemble and safer in use, the armature assembly thereof being electrically isolated.
The unit also features electrically non-conductive motor mounts at and about peripheral portions thereof, including radially projected arms which clamp therebetween spacer tubes serving as hand holds. The drive element of the unit which serves to connect the same to a device to be operated is made so as to embody an electrical non-conductive portion in the length thereof which electri-cally isolates the armature assembly of the unit from the connected device.
One embodiment of the invention provides a drive motor unit for an internal vibrator or like tool device comprising a tubular shell of non-conductive material having non-conductive end closure portions forming therewith a housing. A shaft mounted armature assembly is provided within said shell the shaft of which is supported for rotation in bearing means seated in recesses in the opposed faces of said end closure portions. The shaft has one end thereof extended beyond one of the bearing means and outwardly of one end of the shell~ A sleeve of non-conductive material is mounted to form a direct extension of the shaft and to project from said shell and said one of said bearing means by way of an aligned passage in one ~B
1~.24298 Serial No. 333,902 - 2a of said end closure portions. The sleeve forms an adapter for coupling the shaft in driving relation to an operating portion of a tool device.
~ nother embodiment of the invention provides a drive motor unit for an internal vibrator or like device including a motor housing having resilient non-conductive motor mounts positioned on and spaced longitudinally thereof and within the limits thereof.
The resilient mounts include portions projecting sub-stantially radially of said housing, whereby the motorunit at rest on a supporting surface has said housing relatively elevated with its longitudinal axis sub-stantially parallel to the supporting surface. Spacer elements which interconnect projecting portions of said mounts orient in circumferentially spaced relation to one another and in substantially parallel, spaced re-lation to said housing. The apparatus provides a plurality of selectively usable hand holds for the motor housing which lie clear of said housing and within the limits of its respective ends. This apparatus may be incorporated to provide a further embodiment of the invention wherein the housing comprises a tubular shell open to each of its opposite ends. The shell is in this case a non-conductive member having non-con-ductive end closure portions applied to its respective ends. In this preferred embodiment one of the end closure portions has a through bore accommodating a B
Serial No. 333,902 - 2b 1~.;2~Z~38 non-conductive extension of a shaft. The shaft mounts an armature assembly within the housing and is rotatably supported within the housing in and with respect to bearing means fixed in the respective end closure por-tions. The shell has in fixed relation thereto a field assembly in surrounding relation to the arm~
ature assembly in said housing and means mounting electrical brush means operatively related to the armature assembly. The end closure portions have portions with which the resilient mounts have end abutting engagement. The spacer elements are con-structed and arranged and applied to the resilient mounts to maintain them in a seated relation to the end closure portions.
B
Docket No.9038- 3
Much time, money and labor has been applied in efforts to render drive units such as above described safer in use.
- Efforts have likewise been applied to render such units simpler in construction, easier to fabricate and assemble and adaptable to use in a variety of potentially dangerous environments and lighter in weight. While prior device~
applied to similar purposes have been developed with some improvement in the area of concern, they have not been so designed as to satisfy the noted criteria, the target and achievement of embodiments of the present invention.
The prior art of which the present inventors are aware comprise the following U.S. Patents:
Holther, Jr. 3,894,254 Masont Jr. 3,188,054 Wyzenbeek 3,180,625 Pratt 3,344,291 Batson et al 3,462,623 Hult 3,760,209 Adair 4,059,898 1~.24298 Serial NO. 333,902 - 2 SU~MARY OF THE INVENTION:
.
The present invention provides a drive motor of the type descxibed which is light in weight, comprised of minimal structure, easy to assemble and safer in use, the armature assembly thereof being electrically isolated.
The unit also features electrically non-conductive motor mounts at and about peripheral portions thereof, including radially projected arms which clamp therebetween spacer tubes serving as hand holds. The drive element of the unit which serves to connect the same to a device to be operated is made so as to embody an electrical non-conductive portion in the length thereof which electri-cally isolates the armature assembly of the unit from the connected device.
One embodiment of the invention provides a drive motor unit for an internal vibrator or like tool device comprising a tubular shell of non-conductive material having non-conductive end closure portions forming therewith a housing. A shaft mounted armature assembly is provided within said shell the shaft of which is supported for rotation in bearing means seated in recesses in the opposed faces of said end closure portions. The shaft has one end thereof extended beyond one of the bearing means and outwardly of one end of the shell~ A sleeve of non-conductive material is mounted to form a direct extension of the shaft and to project from said shell and said one of said bearing means by way of an aligned passage in one ~B
1~.24298 Serial No. 333,902 - 2a of said end closure portions. The sleeve forms an adapter for coupling the shaft in driving relation to an operating portion of a tool device.
~ nother embodiment of the invention provides a drive motor unit for an internal vibrator or like device including a motor housing having resilient non-conductive motor mounts positioned on and spaced longitudinally thereof and within the limits thereof.
The resilient mounts include portions projecting sub-stantially radially of said housing, whereby the motorunit at rest on a supporting surface has said housing relatively elevated with its longitudinal axis sub-stantially parallel to the supporting surface. Spacer elements which interconnect projecting portions of said mounts orient in circumferentially spaced relation to one another and in substantially parallel, spaced re-lation to said housing. The apparatus provides a plurality of selectively usable hand holds for the motor housing which lie clear of said housing and within the limits of its respective ends. This apparatus may be incorporated to provide a further embodiment of the invention wherein the housing comprises a tubular shell open to each of its opposite ends. The shell is in this case a non-conductive member having non-con-ductive end closure portions applied to its respective ends. In this preferred embodiment one of the end closure portions has a through bore accommodating a B
Serial No. 333,902 - 2b 1~.;2~Z~38 non-conductive extension of a shaft. The shaft mounts an armature assembly within the housing and is rotatably supported within the housing in and with respect to bearing means fixed in the respective end closure por-tions. The shell has in fixed relation thereto a field assembly in surrounding relation to the arm~
ature assembly in said housing and means mounting electrical brush means operatively related to the armature assembly. The end closure portions have portions with which the resilient mounts have end abutting engagement. The spacer elements are con-structed and arranged and applied to the resilient mounts to maintain them in a seated relation to the end closure portions.
B
Docket No.9038- 3
2~8 A preferred embodiment of the invention unit for drive of the flexible drive shaft of an internal vibrator embodies a field assembly which slip fits in a cylindrical shell which includes positioning mean~ to which the field assembly and electrically connected commutator brush means may be releasably fixed. Slip fit as a unit into this shell i~ an armature assembly including a commutator means fixedly mounted directly to and about shaft means intermediate its - ends. One end portion of the ~haft means provides an electrically non-conductive coupling device ~or drivingly relating the shaft means to a device which must be powered.
The shaft means has affixed thereto the inner races of bearing means to either end of the armature assembly the outer races of which are in direct contact with and pro-tected by electrically non-conductive material forming part of end covers for said cylindrical shell. The end covers ; are slotted and fan blade means are fixed directly to said shaft means to produce a cooling flow of air about the `drive unit component~. The preferred drive unit also embodies rubber, electrically non-conductive, motor mounts ring-shaped base portions of which seat about and are contained to the shell by electrically non-conductive end covers. Projecting radially from the ring-shaped base portions are arms spaced by tube elements which provide electrically insulated hand holds for said drive unit between and clear of said end covers.
Docket No.9038- 4 1~242~8 In particularly preferred embodiments the ~hell as well as the cove~ are formed of electrically non-conductive material, for example, Lexan.
A primary object of the invention is to provide a motor drive unit which is constructed of a minimal number of easily fabricated parts, easy to assemble and safer in use .
Another object is to provide a drive unit of the type described wherein the armature assembly is electrically isolated from the driven device.
A further object i8 to provide a motor drive unit in segments which are readily ~lip fit, oneto another.
An additional object i~ to pxovide a hand held motor drive unit with improved resilient motor mounts which are 31ip fit to a shell defining the peripheral wall of the unit housing and positioned thereon by electrically non-conduc-tive end cover portions of said housing as hand hold elements are applied to maintain ~aid mounts about and spaced longitudinally of said shell between said end covers.
Another object is to provide a drive motor unit and components thereof possessing the advantageous structural features, the inherent meritorious characteristics and the means and mode of use herein described.
With the above and other incidental objects in view as will more fully appear in the specification, the invention intended to be protected by Letters Patent consists of the Docket No.9038- 5 ~..29L2~8 features of construction, the parts and combinations thereof, and the mode of operation as hereinafter described or illustrated in the accompanying drawings, or their equivalents.
Referring to the accompanying drawing wherein are shown some but not necessarily the only forms of embodiment of the invention, Fig. 1 is a perspective view of a drive unit providing one embodiment of the present invention;
Fig. 2 is a longitudinal section thereof;
Fig. 3 is an explo~ed view of the unit;
Fig. 4 i8 a sectional view taken along line 4-4 of Fig. 2;
Fig. 5 is a view of one end of the unit;
Fig. 6 is a view of the opposite or drive end thereof, partq beipg omitted for clarity;
Fig. 7 is a view taken on line 7-7 of Fig. 2;
Fig. 8 is a perspective view illustrating the inter-relation of the commutator shield and cover observed in Fig. 5; and Fig. 9 is a view taken on line 9-9 of Fig. 6.
Like parts are indicated by similar characters of reference throughout the æeveral views.
Docket No. 9038-6 ~L~.Z4~g8 DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
The drive motor unit illustrated includes a conventional armature assembly 10 comprising an armature 12 and commu~ator 14 fixed to and about a drive shaft 16. The commutator end of the armature assembly positions in immediately adjacent but spaced relation ~o a bearing unit 18, the inner race of which is fixed peripherally of one end of the shaft 16. The opposite end portion of the shaft 16 projects beyond the end of the armature assembly remote from the commutator to fix-lU edly mount thereon and thereabout, in spaced relation to thearmature asse~bly, a bladed fan element 19. Fixed about the shaft 16 immediately beyond and in closely spaced relation to the fan element 19 i9 the inner race of a second bearing unit 20. The projected extremity of shaft 16 remote from the commutator and the bearing unit 18, which lies immediately beyond the bearing unit 20 nests in a socket in one end of a drive sleeve 22, to which it is fixed by a radially applied pin 24.
The sleeve 22, which is thereby connected with and forms an axial exten~ion of the shaft 16, is formed with a longitudinally extended pocket 26 in its outermost end which is rectangular in transverse ~ection to accommodate and have connected thereto the complementarily shaped driven end of a flexible shaft 28 the remote end of which connects, in the application illustrated, to the eccentric embodied in an internal vibrator (not shown).
~ocket No. 9038 - 7 ~.;24Z~8 The outer race of the bearing unit 20 is press fit in a counterbore in one end of the bore of a sleeve 32 formed of high impact strength plastic, such as "Lexan".
A counterbore in the opposite end of sleeve 32 fixedly nests a metal sleeve-like insert 34 the outermost end of which terminates at the outermost end of this sleeve.
The inner surface of the insert 34 is formed with a thread for threaded engagement therewith of the adapter end portion 36 of the sleeve-like protective cover of the flexible shaft 28 the driven end of which is applied - to the drive sleeve 22.
The sleeve 22 is also formed of high impact strength plastic such as Lexan and provides an insulating barrier between the shaft 16 and the applied flexible shaft 28.
Formed integral with and projected radially of the outer surface of the sleeve 32 is a series of circumfer-entially and equidistantly spaced fins 38 of generally right triangular shape. The apex ends of the fins lie at the projected extremity of the sleeve 32 and the fins extend longitudinally and inwardly of the sleeve length to have their base ends integrate and merge with a radially pro-jected annular skirt 40 molded integral with the outer surface of the sleeve 32, in adjacent spaced relation to the end thereof in which is press fit the bearing unit 20. The radial extent of skirt 40 is of the same dimension as that of the base of the fins 38. The skirt 40 is formed to include therein arcuate slots 42, in circularly spaced Docket No.9038 -8 ~.Z4298 relation, immediately of its outer periphery. This pro-vides air passages therein between the circularly spaced integrated ends of the fins.
The skir~ 40 has a flange 44 integral with its outer peripheral edge which projects concentrically about the sleeve 32 towards but terminates in spaced adjacent relation to the plane of its inner end. Circularly spaced radial ribs integrate with and extend between the outer surface portion of the sleeve 32 bounded by the flange 44 and the inner surface of the flange. Formed integral with and peripheral to the outer surface of flange 44 intermediate its axial limits, is an annular cup-like projection 46 the base of which lies most adjacent the plane of the inner end of sleeve 32. A radially projected ear 48 is formed at each end of an outer diameter of the composite of the flange 44 and projection 46. Each ear 48 has a socket formed in its surface facing the plane of the outermost end of sleeve 32 in which is press fit a metal sleeve the bore of which is extended by a through bore in the ear. The purpose of this will soon be obvious.
The armature assembly 10 is designed to slip fit within and concentrically of a sleeve-like field assembly 50 to be immediately bounded by the diametrically opposite pole pieces thereof. The field assembly 50 nests in turn in a cylindrical shell 52. The latter is a thin walled structure formed of high impact strength insulating Docket No. 9038 -9 Zd~2~3 plastic material such as "Lexan" and embodies in integrally molded relation to it~ inner surface, adjacent the end thereof remote fxom that in which the armature assembly is applied in assembly of the motor drive unit,two pair of apertured ears, the ears of one pair being designated as 54 and the other as S6 in the accompanying drawings.
- The ears 54 are co-planar, diametrically opposite and serve as an abutment against which one end of the field assembly 50 seats as it is assembled to the shell 52.
When the assembly 50 is properly seated, bores provided therein, the length thereof,accommodate the application therein of the bodies of applied screws 60 the heads of which abut one end of the field assembly 50 (washers being applied therebetween) as their threaded projected extrem-ities pas~ through apertures in the ears 54 aligned there-with. Nuts are applied to the screws 60 to clamp to the ears 54 and secure the field assembly 50 within and to the shell 52 thereby.~s thus fixed the field assembly 50 lines the shell 52 at a location intermediate and spaced from its respective ends.
The ears 56 lie immediately of and in spaced relation to the ears 54 at locations spaced 90 from the respective positions of ears 54 and adjacent the end of the shell 52 remote from ~hat end in which is inserted the armature assembly including the drive shaft 16.
Docket No.9038 -10 1~29L~8 A centrally apertured plate 62 of plastic material which forms the base of a brush assembly 64 is fixed by screws to the surface of ears 56 ou-termost of the shell 52.
l'he brush assembly 64 is conventional, including diamet-rically opposed and spaced brushes which are spring biased towards each other and directed towards the aperture cen-trally of the plate 62. The armature wiring is suitably connected with the conductive brush devices and its input leads are projected from the shell 52 by way of an aperture therein into a plastic switch housing 66, fixed by elec-trically non-conductive screws to the exterior of shell 52.
Within the housing 66 a switch is inserted in one lead and both leads are projected from the switch housing in a cable form 68. The exposed toggle operator control for the switch is electrically non-condllctive so the operator of the drive unit is isolated also in this respect from any transmission to his body of electrical energy. The projected ends of the leads attach to a conventional male plug serving for the connection thereof to an available source of power.
Slip fit over the end of shell 52 remote from that end embodying therein the ears 54 and 56 is a rubber mount 70. The mount 70 is molded to comprise an inner ring portion 72 having formed in connection therewith a series of four radially projected co-planar arms 74 of generally symmetrical triangular configuration in the plane of the ring portion 72. The face 73 of the ring and its integrated arms positioning innermost of the end of the shell 52 to which it mounts is in a single plane perpendicular to the central axis of the shell. The outer rounded apex ends of the arms 74 have bullet-like projections 76 at the face thereof remote from the face 73. There is a small Docket No. 9038-11 ~.Z4Z9~3 diameter through bore in each apex end of these arms 74 and through the axial center of its projection 76 and a large diameter counterbore 75 in the end of this bore opening from the face 73. The inner surface of the ring portion 72 has two notches 78 therein which are spaced 180 apart, the purpose of which will be made obvious.
qhe face of the ring portion outermost and remote from its end or face portion included in the surface 73 has it~ outer peripheral edge portion formed to include an axial annular projection, providing that its inner edge portion forms thereby a recessed shoulder 79 facing outwardly of the rubber mount and the end of the shell 52 to which it mounts. This axial annular projection and the bullet-like projections on the rubber mountq are bridged by ribs at the face of arms 74 remote from the face 7~. The apex or nose portions of each bullet-like projection on the arms 74 also have a counterbore pro-ducing a pocket and a recessed annular shoulder facing outwardly thereof.
When the field assembly 50 is slip fit into the shell 52 to line its interior, intermediate its ends, and is connected as above described; the plate 62 mounting the brush assembly 64 iq also secured in place; and the one motor mount 70 is applied about the end portion of the shell 52 remote from the brush assembly, the shoulder 79 will be positioned co-planar with the end face of the shell 52 which it rims. One can then apply the armature Docket No. 9038 - 12 ~.2~2g8 assembly including the drive shaft 16 and the connected hearing units 18 and 20, commutator end first, through the open end of the shell 52 through which the field assembly has been first applied. The armature assembl~
will have connected therewith, at this point, the sleeve 32 and its integrated structure which is press fit in connection with the outer race of the bearing unit 20.
Also the drive sleeve 22 will be connected, forming an axial extension of shaft 16 which positions its outer projected end within the limits of the internally threaded insert 34O This completely interconnected structure em-bodying the armature assembly iR effectively provided at this point as a unitary structure. Thi unitized struc-ture is easily held by grasping the Lexan cup structure including the finned sleeve 32 as the armature assembly is advanced within the field assembly. As the armature assembly is brought to its desired position the bearing 18 in advance of the commutator passes between the com-mutator brushes, which are spread to this end, and positions immediately outward of the adjacent end of the shell 52.
At the same time the commutator bars position between the brushes 64 which are spring biased for an inherent pos-itive contact therewith as the armature positions within the pole pieces of the field assembly 50. The base end of the annular cup-like projection 46 simultaneously seats to and abuts with the facing end of shell 52 and Docket No. 9038-13 1~:.242~98 the shoulder 79 on the adjacent motor mount, the ear~ 48 nesting in appropriate seats defined at the outer face of the mo~or mount embodying openings to and in direct alignment with the respective notches 78.
A second motor mount 70 is mounted about the end of the shell 52 remote from the motor mount 70 first described. This second mount i8 identical to the first and has its planar face 73 facing that of the first described motor mount.
The end of the shell 52 from which projects the end of the motor drive shaft mounting the bearing unit 18 is covered by a "Lexan" cap plate 80. The latter has a shallow dome or cup shape the center of the base of which has an integrally molded cup-like portion 82 the base of which projects outwardly of the center of plate 80 and includes a small central aperture. Seated to the base of the cup portion 82 is a spring washer.
In application of the plate 80 the cup portion 82 receives and nests therein, in frictional connection therewith, the outer race of the bearing unit 18. The end face of the shell 52 adjacent, peripheral to and offset from the bearing unit 18 is stepped inwardly of shell 52 at its inner edge portion to seat within the shell 52 an annular projection at the inner edge portion of the peripheral wall of the cupped cap plate 80. Integrated with the outer periphery of the peripheral wall of the cap portion 80 is Docket No, 903~-14 1~.2~2~8 a flange~like radial projection 84 the ~ase of which seat~
to the facing end face portion of the shell 5~ and the shoulder portion 79 of the urrounding i.nner ring portion of the a~jacent mount 70. Also included at the outer periphery of the cap element 80 are diametrically spaced ears 86 adapted to seat to the adjacent shoulder 79 of the second described motor mount in areas formed to accommodate the same and to provide that apertures ~herein align with notches 78. Also formed in the base of the cap plate 80 are four circularly and equidistantly spaced arcuate slots 88 providing a~r inl~ vents.
The application of the cap plate 80 completes the confinement of the armature assembly 10 since as it caps the one end of shell 52, the opposite end is capped by the Lexan structure embodying the sleeve portion 32.
Air pas~ages are provided to either end of the shell 52 by the slots 42 and 88.
Metal tubes 92 are applied between aligned pairs of arms 74 of the motor mounts to spd~e the same, seating their respective ends in facing counterbores 75 at the outer ends of the paired longitudinally spaced arms.
A screw 96 is applied through the bore in each apex end of each arm 74 embodied in connection with one motor mount 70 and through the projection 76 thereon to ~eat the head of the screw in the pocket defined in the no~e of the projection as the body of the ~crew threads Docket No. 9038-15 ~.2~2~38 through the connected tube 92 and the bore in the apex of the longitudinally spaced arm 74 of the second motor mount aligned therewith. A nut applied to the projected extremity of each screw seats in the pocket in the nose of the bullet shaped projection of the aligned arm of the second motor mount.
The application of the screws 96 and the applied nuts, as described, serve to clamp the motor mounts to the tubes 92 to firmly space and establish the mounts in protective positions to and about the shell 52 and its contained structure. By the same token, the elements of the drive motor as well as the mounts 70 are securely contained and clamped in place on application of further screws 90 in a manner to be described.
A dome-shaped plate 98 formed of "Lexan" or equivalent material which is electrically non-conductive is applied to form a shield or the commutator, over and in spaced relation to the outer face of the cap plate 80, At the center of its concave inner face the plate 98 has formed 2~ integral therewith a short projected pin 102 the pro-jected extremity of which seats to the center of the base of the cup portion 82 on application of the shield.
This maintains a spacing between ~he shield 98 and the cap or cover 80. Mounted integrally with and projected from the inner surface of the plate 98, adjacent its outer peripheral edge, is a series of circularly spaced Docket No. 9038-16 ~.2~Z~8 plate segments 100 each formed as a longitudinal segment of a cylindrical shell. The segments lO0, if joined in a cixcular sense, would form a short cylindrical wall concentric to and about the pin 102. The axial length of the segment~ lO0 cause them to mutually project out-wardly of the concave side of plate 98. In the appli-cation of the shield to the cover plate 80 the projected extremities of the plates lO0 are applied to bear about and on the outer peripheral wall surface of the cup shape of the plate 80 and seat in an annular groove 101 formed in the peripheral projection therefrom. Flatted apertured portions 103 provided at the periphery of the plate 98 seat over the ear portions 86 as the shield is applied.
Particular attention is directed to the fact that the pin 102 achieves the spacing of the shield so as to provide for free air to pass into the shell 52 by way of the slots 88. A feature of advantage is that air passing inwardly through the slots 88 will find the concave inner surface of the dome shape of the shield 98 effective to insure its rapid flow inwardly of the drive unit between the outer peripheral edge of the plate 80 and the lip at the base of the plate 98.
Docket No. 9038 _17 ~.24;~8 The bodies of headed screws 90 are applied in obvious fashion through the aligned apertured ears 48 and 86 and shield portions 103 which as the parts seat align with motor mount notches 78, the latter permitting free passage of the screws as the screw heads seat in the pockets opening outward of ears 48 and a nut is applied in each case to the projected end of the screw outwardly of the portions 103 of the shield. The suitable rotation of the nuts on the screws will not only clamp the end cover elements over the respective ends of shell 52 and the shield 98 in place but will also serve to establish the inner ring portions of the electrically non-conductive motor mounts in place, in obvious fashion.
Docket No. 9038-18 ~.2~298 The foregoing description should highlight the features of the present invention by way of illustration.
Particular note is to be taken of the fact that the construction of the partq and their assembly is such as to facilitate a most simple fabrication and connection thereof. The parts are minimal in nature and el~bodied therein are means which fully isolate the armature assembly from any device to which the shaft means serving as the driver portion of the motor unit may be coupled. Even in coupling of a connected device, the transmission of a source of electrical shock from the connected device is precluded due to the fact that both the driver portion of the shaft means and the surrounding sleeve forming part of the end cover plate for the shell are fully made of electrically non-conductive material. The shell 52 is very simply clamped between the non-conductive end cover plates and serves itself to support the electric-ally non-conductive motor mounts which are resilient in nature and also contained by the end cover plates in the assembl~ of the unit. The hand holds 92 are thus clearly divorced from any potential conductive relation to any portion of the drive unit or a connected device.
Note further the unique assembly of the armature and commutator means in connection with the shaft which does not have nor does it require an insulating sleeve between the armature assembly and the shaft. The necessity for such a sleeve is obviated by the de~cribed structure.
Docket No~ 9038-19 ~.Z~2~8 Nor are there required any metal bearlng sleeves in connection with the end cover plates, as are normally pro-vided i~ prior art devices. There is a simple friction fit and surface contact between the outer races of the bearings and the non-conductive material of the end cover plates.
Even further, the shaft means embodied in connection with the armature assembly has fixedly connected therewith, within the housing of the driver uni~ a fan means and together with the form of the end plates enables a cooling ~ystem of extreme importance, one which is effective at all times and preserves the condition of the elements of the motor drive unit, insuring against deterioration.
Not only is there a plural in~ulation electrically, but critical working parts of the drive unit are protect~d from environmental influence as well as mechanical shock damage to a maximum degree.
From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in it~ form, proportions, detail con~truc-tion and arrangement of parts without departing from the principle involved or sacrificing any of it~ advantage~
While in order to comply with the statute the inven-tion has been described in language more or le~s ~pecific as to structural features, it i8 to be understood that the invention is not limited to the specific features Docket No.9038 -20 ~.2~2~8 shown, but that the means and con~truction herein dis-clo~ed comprise but one of several modes of putting the invention into effect and the invention is therefore claimed in any of its forms or modifications within the legitimate and valid scope of the appended claims.
The shaft means has affixed thereto the inner races of bearing means to either end of the armature assembly the outer races of which are in direct contact with and pro-tected by electrically non-conductive material forming part of end covers for said cylindrical shell. The end covers ; are slotted and fan blade means are fixed directly to said shaft means to produce a cooling flow of air about the `drive unit component~. The preferred drive unit also embodies rubber, electrically non-conductive, motor mounts ring-shaped base portions of which seat about and are contained to the shell by electrically non-conductive end covers. Projecting radially from the ring-shaped base portions are arms spaced by tube elements which provide electrically insulated hand holds for said drive unit between and clear of said end covers.
Docket No.9038- 4 1~242~8 In particularly preferred embodiments the ~hell as well as the cove~ are formed of electrically non-conductive material, for example, Lexan.
A primary object of the invention is to provide a motor drive unit which is constructed of a minimal number of easily fabricated parts, easy to assemble and safer in use .
Another object is to provide a drive unit of the type described wherein the armature assembly is electrically isolated from the driven device.
A further object i8 to provide a motor drive unit in segments which are readily ~lip fit, oneto another.
An additional object i~ to pxovide a hand held motor drive unit with improved resilient motor mounts which are 31ip fit to a shell defining the peripheral wall of the unit housing and positioned thereon by electrically non-conduc-tive end cover portions of said housing as hand hold elements are applied to maintain ~aid mounts about and spaced longitudinally of said shell between said end covers.
Another object is to provide a drive motor unit and components thereof possessing the advantageous structural features, the inherent meritorious characteristics and the means and mode of use herein described.
With the above and other incidental objects in view as will more fully appear in the specification, the invention intended to be protected by Letters Patent consists of the Docket No.9038- 5 ~..29L2~8 features of construction, the parts and combinations thereof, and the mode of operation as hereinafter described or illustrated in the accompanying drawings, or their equivalents.
Referring to the accompanying drawing wherein are shown some but not necessarily the only forms of embodiment of the invention, Fig. 1 is a perspective view of a drive unit providing one embodiment of the present invention;
Fig. 2 is a longitudinal section thereof;
Fig. 3 is an explo~ed view of the unit;
Fig. 4 i8 a sectional view taken along line 4-4 of Fig. 2;
Fig. 5 is a view of one end of the unit;
Fig. 6 is a view of the opposite or drive end thereof, partq beipg omitted for clarity;
Fig. 7 is a view taken on line 7-7 of Fig. 2;
Fig. 8 is a perspective view illustrating the inter-relation of the commutator shield and cover observed in Fig. 5; and Fig. 9 is a view taken on line 9-9 of Fig. 6.
Like parts are indicated by similar characters of reference throughout the æeveral views.
Docket No. 9038-6 ~L~.Z4~g8 DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
The drive motor unit illustrated includes a conventional armature assembly 10 comprising an armature 12 and commu~ator 14 fixed to and about a drive shaft 16. The commutator end of the armature assembly positions in immediately adjacent but spaced relation ~o a bearing unit 18, the inner race of which is fixed peripherally of one end of the shaft 16. The opposite end portion of the shaft 16 projects beyond the end of the armature assembly remote from the commutator to fix-lU edly mount thereon and thereabout, in spaced relation to thearmature asse~bly, a bladed fan element 19. Fixed about the shaft 16 immediately beyond and in closely spaced relation to the fan element 19 i9 the inner race of a second bearing unit 20. The projected extremity of shaft 16 remote from the commutator and the bearing unit 18, which lies immediately beyond the bearing unit 20 nests in a socket in one end of a drive sleeve 22, to which it is fixed by a radially applied pin 24.
The sleeve 22, which is thereby connected with and forms an axial exten~ion of the shaft 16, is formed with a longitudinally extended pocket 26 in its outermost end which is rectangular in transverse ~ection to accommodate and have connected thereto the complementarily shaped driven end of a flexible shaft 28 the remote end of which connects, in the application illustrated, to the eccentric embodied in an internal vibrator (not shown).
~ocket No. 9038 - 7 ~.;24Z~8 The outer race of the bearing unit 20 is press fit in a counterbore in one end of the bore of a sleeve 32 formed of high impact strength plastic, such as "Lexan".
A counterbore in the opposite end of sleeve 32 fixedly nests a metal sleeve-like insert 34 the outermost end of which terminates at the outermost end of this sleeve.
The inner surface of the insert 34 is formed with a thread for threaded engagement therewith of the adapter end portion 36 of the sleeve-like protective cover of the flexible shaft 28 the driven end of which is applied - to the drive sleeve 22.
The sleeve 22 is also formed of high impact strength plastic such as Lexan and provides an insulating barrier between the shaft 16 and the applied flexible shaft 28.
Formed integral with and projected radially of the outer surface of the sleeve 32 is a series of circumfer-entially and equidistantly spaced fins 38 of generally right triangular shape. The apex ends of the fins lie at the projected extremity of the sleeve 32 and the fins extend longitudinally and inwardly of the sleeve length to have their base ends integrate and merge with a radially pro-jected annular skirt 40 molded integral with the outer surface of the sleeve 32, in adjacent spaced relation to the end thereof in which is press fit the bearing unit 20. The radial extent of skirt 40 is of the same dimension as that of the base of the fins 38. The skirt 40 is formed to include therein arcuate slots 42, in circularly spaced Docket No.9038 -8 ~.Z4298 relation, immediately of its outer periphery. This pro-vides air passages therein between the circularly spaced integrated ends of the fins.
The skir~ 40 has a flange 44 integral with its outer peripheral edge which projects concentrically about the sleeve 32 towards but terminates in spaced adjacent relation to the plane of its inner end. Circularly spaced radial ribs integrate with and extend between the outer surface portion of the sleeve 32 bounded by the flange 44 and the inner surface of the flange. Formed integral with and peripheral to the outer surface of flange 44 intermediate its axial limits, is an annular cup-like projection 46 the base of which lies most adjacent the plane of the inner end of sleeve 32. A radially projected ear 48 is formed at each end of an outer diameter of the composite of the flange 44 and projection 46. Each ear 48 has a socket formed in its surface facing the plane of the outermost end of sleeve 32 in which is press fit a metal sleeve the bore of which is extended by a through bore in the ear. The purpose of this will soon be obvious.
The armature assembly 10 is designed to slip fit within and concentrically of a sleeve-like field assembly 50 to be immediately bounded by the diametrically opposite pole pieces thereof. The field assembly 50 nests in turn in a cylindrical shell 52. The latter is a thin walled structure formed of high impact strength insulating Docket No. 9038 -9 Zd~2~3 plastic material such as "Lexan" and embodies in integrally molded relation to it~ inner surface, adjacent the end thereof remote fxom that in which the armature assembly is applied in assembly of the motor drive unit,two pair of apertured ears, the ears of one pair being designated as 54 and the other as S6 in the accompanying drawings.
- The ears 54 are co-planar, diametrically opposite and serve as an abutment against which one end of the field assembly 50 seats as it is assembled to the shell 52.
When the assembly 50 is properly seated, bores provided therein, the length thereof,accommodate the application therein of the bodies of applied screws 60 the heads of which abut one end of the field assembly 50 (washers being applied therebetween) as their threaded projected extrem-ities pas~ through apertures in the ears 54 aligned there-with. Nuts are applied to the screws 60 to clamp to the ears 54 and secure the field assembly 50 within and to the shell 52 thereby.~s thus fixed the field assembly 50 lines the shell 52 at a location intermediate and spaced from its respective ends.
The ears 56 lie immediately of and in spaced relation to the ears 54 at locations spaced 90 from the respective positions of ears 54 and adjacent the end of the shell 52 remote from ~hat end in which is inserted the armature assembly including the drive shaft 16.
Docket No.9038 -10 1~29L~8 A centrally apertured plate 62 of plastic material which forms the base of a brush assembly 64 is fixed by screws to the surface of ears 56 ou-termost of the shell 52.
l'he brush assembly 64 is conventional, including diamet-rically opposed and spaced brushes which are spring biased towards each other and directed towards the aperture cen-trally of the plate 62. The armature wiring is suitably connected with the conductive brush devices and its input leads are projected from the shell 52 by way of an aperture therein into a plastic switch housing 66, fixed by elec-trically non-conductive screws to the exterior of shell 52.
Within the housing 66 a switch is inserted in one lead and both leads are projected from the switch housing in a cable form 68. The exposed toggle operator control for the switch is electrically non-condllctive so the operator of the drive unit is isolated also in this respect from any transmission to his body of electrical energy. The projected ends of the leads attach to a conventional male plug serving for the connection thereof to an available source of power.
Slip fit over the end of shell 52 remote from that end embodying therein the ears 54 and 56 is a rubber mount 70. The mount 70 is molded to comprise an inner ring portion 72 having formed in connection therewith a series of four radially projected co-planar arms 74 of generally symmetrical triangular configuration in the plane of the ring portion 72. The face 73 of the ring and its integrated arms positioning innermost of the end of the shell 52 to which it mounts is in a single plane perpendicular to the central axis of the shell. The outer rounded apex ends of the arms 74 have bullet-like projections 76 at the face thereof remote from the face 73. There is a small Docket No. 9038-11 ~.Z4Z9~3 diameter through bore in each apex end of these arms 74 and through the axial center of its projection 76 and a large diameter counterbore 75 in the end of this bore opening from the face 73. The inner surface of the ring portion 72 has two notches 78 therein which are spaced 180 apart, the purpose of which will be made obvious.
qhe face of the ring portion outermost and remote from its end or face portion included in the surface 73 has it~ outer peripheral edge portion formed to include an axial annular projection, providing that its inner edge portion forms thereby a recessed shoulder 79 facing outwardly of the rubber mount and the end of the shell 52 to which it mounts. This axial annular projection and the bullet-like projections on the rubber mountq are bridged by ribs at the face of arms 74 remote from the face 7~. The apex or nose portions of each bullet-like projection on the arms 74 also have a counterbore pro-ducing a pocket and a recessed annular shoulder facing outwardly thereof.
When the field assembly 50 is slip fit into the shell 52 to line its interior, intermediate its ends, and is connected as above described; the plate 62 mounting the brush assembly 64 iq also secured in place; and the one motor mount 70 is applied about the end portion of the shell 52 remote from the brush assembly, the shoulder 79 will be positioned co-planar with the end face of the shell 52 which it rims. One can then apply the armature Docket No. 9038 - 12 ~.2~2g8 assembly including the drive shaft 16 and the connected hearing units 18 and 20, commutator end first, through the open end of the shell 52 through which the field assembly has been first applied. The armature assembl~
will have connected therewith, at this point, the sleeve 32 and its integrated structure which is press fit in connection with the outer race of the bearing unit 20.
Also the drive sleeve 22 will be connected, forming an axial extension of shaft 16 which positions its outer projected end within the limits of the internally threaded insert 34O This completely interconnected structure em-bodying the armature assembly iR effectively provided at this point as a unitary structure. Thi unitized struc-ture is easily held by grasping the Lexan cup structure including the finned sleeve 32 as the armature assembly is advanced within the field assembly. As the armature assembly is brought to its desired position the bearing 18 in advance of the commutator passes between the com-mutator brushes, which are spread to this end, and positions immediately outward of the adjacent end of the shell 52.
At the same time the commutator bars position between the brushes 64 which are spring biased for an inherent pos-itive contact therewith as the armature positions within the pole pieces of the field assembly 50. The base end of the annular cup-like projection 46 simultaneously seats to and abuts with the facing end of shell 52 and Docket No. 9038-13 1~:.242~98 the shoulder 79 on the adjacent motor mount, the ear~ 48 nesting in appropriate seats defined at the outer face of the mo~or mount embodying openings to and in direct alignment with the respective notches 78.
A second motor mount 70 is mounted about the end of the shell 52 remote from the motor mount 70 first described. This second mount i8 identical to the first and has its planar face 73 facing that of the first described motor mount.
The end of the shell 52 from which projects the end of the motor drive shaft mounting the bearing unit 18 is covered by a "Lexan" cap plate 80. The latter has a shallow dome or cup shape the center of the base of which has an integrally molded cup-like portion 82 the base of which projects outwardly of the center of plate 80 and includes a small central aperture. Seated to the base of the cup portion 82 is a spring washer.
In application of the plate 80 the cup portion 82 receives and nests therein, in frictional connection therewith, the outer race of the bearing unit 18. The end face of the shell 52 adjacent, peripheral to and offset from the bearing unit 18 is stepped inwardly of shell 52 at its inner edge portion to seat within the shell 52 an annular projection at the inner edge portion of the peripheral wall of the cupped cap plate 80. Integrated with the outer periphery of the peripheral wall of the cap portion 80 is Docket No, 903~-14 1~.2~2~8 a flange~like radial projection 84 the ~ase of which seat~
to the facing end face portion of the shell 5~ and the shoulder portion 79 of the urrounding i.nner ring portion of the a~jacent mount 70. Also included at the outer periphery of the cap element 80 are diametrically spaced ears 86 adapted to seat to the adjacent shoulder 79 of the second described motor mount in areas formed to accommodate the same and to provide that apertures ~herein align with notches 78. Also formed in the base of the cap plate 80 are four circularly and equidistantly spaced arcuate slots 88 providing a~r inl~ vents.
The application of the cap plate 80 completes the confinement of the armature assembly 10 since as it caps the one end of shell 52, the opposite end is capped by the Lexan structure embodying the sleeve portion 32.
Air pas~ages are provided to either end of the shell 52 by the slots 42 and 88.
Metal tubes 92 are applied between aligned pairs of arms 74 of the motor mounts to spd~e the same, seating their respective ends in facing counterbores 75 at the outer ends of the paired longitudinally spaced arms.
A screw 96 is applied through the bore in each apex end of each arm 74 embodied in connection with one motor mount 70 and through the projection 76 thereon to ~eat the head of the screw in the pocket defined in the no~e of the projection as the body of the ~crew threads Docket No. 9038-15 ~.2~2~38 through the connected tube 92 and the bore in the apex of the longitudinally spaced arm 74 of the second motor mount aligned therewith. A nut applied to the projected extremity of each screw seats in the pocket in the nose of the bullet shaped projection of the aligned arm of the second motor mount.
The application of the screws 96 and the applied nuts, as described, serve to clamp the motor mounts to the tubes 92 to firmly space and establish the mounts in protective positions to and about the shell 52 and its contained structure. By the same token, the elements of the drive motor as well as the mounts 70 are securely contained and clamped in place on application of further screws 90 in a manner to be described.
A dome-shaped plate 98 formed of "Lexan" or equivalent material which is electrically non-conductive is applied to form a shield or the commutator, over and in spaced relation to the outer face of the cap plate 80, At the center of its concave inner face the plate 98 has formed 2~ integral therewith a short projected pin 102 the pro-jected extremity of which seats to the center of the base of the cup portion 82 on application of the shield.
This maintains a spacing between ~he shield 98 and the cap or cover 80. Mounted integrally with and projected from the inner surface of the plate 98, adjacent its outer peripheral edge, is a series of circularly spaced Docket No. 9038-16 ~.2~Z~8 plate segments 100 each formed as a longitudinal segment of a cylindrical shell. The segments lO0, if joined in a cixcular sense, would form a short cylindrical wall concentric to and about the pin 102. The axial length of the segment~ lO0 cause them to mutually project out-wardly of the concave side of plate 98. In the appli-cation of the shield to the cover plate 80 the projected extremities of the plates lO0 are applied to bear about and on the outer peripheral wall surface of the cup shape of the plate 80 and seat in an annular groove 101 formed in the peripheral projection therefrom. Flatted apertured portions 103 provided at the periphery of the plate 98 seat over the ear portions 86 as the shield is applied.
Particular attention is directed to the fact that the pin 102 achieves the spacing of the shield so as to provide for free air to pass into the shell 52 by way of the slots 88. A feature of advantage is that air passing inwardly through the slots 88 will find the concave inner surface of the dome shape of the shield 98 effective to insure its rapid flow inwardly of the drive unit between the outer peripheral edge of the plate 80 and the lip at the base of the plate 98.
Docket No. 9038 _17 ~.24;~8 The bodies of headed screws 90 are applied in obvious fashion through the aligned apertured ears 48 and 86 and shield portions 103 which as the parts seat align with motor mount notches 78, the latter permitting free passage of the screws as the screw heads seat in the pockets opening outward of ears 48 and a nut is applied in each case to the projected end of the screw outwardly of the portions 103 of the shield. The suitable rotation of the nuts on the screws will not only clamp the end cover elements over the respective ends of shell 52 and the shield 98 in place but will also serve to establish the inner ring portions of the electrically non-conductive motor mounts in place, in obvious fashion.
Docket No. 9038-18 ~.2~298 The foregoing description should highlight the features of the present invention by way of illustration.
Particular note is to be taken of the fact that the construction of the partq and their assembly is such as to facilitate a most simple fabrication and connection thereof. The parts are minimal in nature and el~bodied therein are means which fully isolate the armature assembly from any device to which the shaft means serving as the driver portion of the motor unit may be coupled. Even in coupling of a connected device, the transmission of a source of electrical shock from the connected device is precluded due to the fact that both the driver portion of the shaft means and the surrounding sleeve forming part of the end cover plate for the shell are fully made of electrically non-conductive material. The shell 52 is very simply clamped between the non-conductive end cover plates and serves itself to support the electric-ally non-conductive motor mounts which are resilient in nature and also contained by the end cover plates in the assembl~ of the unit. The hand holds 92 are thus clearly divorced from any potential conductive relation to any portion of the drive unit or a connected device.
Note further the unique assembly of the armature and commutator means in connection with the shaft which does not have nor does it require an insulating sleeve between the armature assembly and the shaft. The necessity for such a sleeve is obviated by the de~cribed structure.
Docket No~ 9038-19 ~.Z~2~8 Nor are there required any metal bearlng sleeves in connection with the end cover plates, as are normally pro-vided i~ prior art devices. There is a simple friction fit and surface contact between the outer races of the bearings and the non-conductive material of the end cover plates.
Even further, the shaft means embodied in connection with the armature assembly has fixedly connected therewith, within the housing of the driver uni~ a fan means and together with the form of the end plates enables a cooling ~ystem of extreme importance, one which is effective at all times and preserves the condition of the elements of the motor drive unit, insuring against deterioration.
Not only is there a plural in~ulation electrically, but critical working parts of the drive unit are protect~d from environmental influence as well as mechanical shock damage to a maximum degree.
From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in it~ form, proportions, detail con~truc-tion and arrangement of parts without departing from the principle involved or sacrificing any of it~ advantage~
While in order to comply with the statute the inven-tion has been described in language more or le~s ~pecific as to structural features, it i8 to be understood that the invention is not limited to the specific features Docket No.9038 -20 ~.2~2~8 shown, but that the means and con~truction herein dis-clo~ed comprise but one of several modes of putting the invention into effect and the invention is therefore claimed in any of its forms or modifications within the legitimate and valid scope of the appended claims.
Claims (13)
1. A drive motor unit for an internal vibrator or like tool device comprising a tubular shell of non-conductive material having non-conductive end closure portions forming therewith a housing, a shaft mounted armature assembly within said shell the shaft of which is supported for rotation in bearing means seated in recesses in the opposed faces of said end closure portions, said shaft having one end thereof extended beyond one of said bearing means and outwardly of one end of said shell, a sleeve of non-conductive material mounted to form a direct extension of said one end of said shaft and to project from said shell and said one bearing means by way of an aligned passage in one of said end closure portions, said sleeve forming an adapter for coupling said shaft in driving relation to an operating portion of a tool device.
2. A drive motor unit as in claim 1 characterized by said end closure portions being provided with apertures and said shaft having means in connection therewith for generating a controlled flow of cooling air through said housing by way of said apertures.
3. A drive motor unit according to claim 1, said shell comprising a tubular element open to each of its opposite ends, said end closure portions being releasably applied Serial No. 333,902 to the opposite ends of said shell and means being applied for interconnecting and securing said end closure portions in clamping engagement with the respective ends of said shell to mount said armature assembly therebetween as the bearings in said recesses accommodate the projection therein of said shaft.
4. A drive motor unit according to claim 1 including a field assembly fixed to said shell in surrounding relation to said armature assembly, said shell having means in con-nection therewith defining a plurality of projections directed inwardly thereof, a first portion of said pro-jections forming a seat adjacent one end of said shell to which said field assembly is abutted and fixed and a further portion of said projections spaced longitudinally from said first portion of said projections providing a mount for means including electrical brush means, one of said end closure portions being releasable to accommodate the insertion of said field assembly within said shell in abutting relation to said first portion of said projections and the fixing of the position of said field assembly thereby in a connected relation to said shell.
5. A drive motor unit according to claim 1 including a shield mounted to one of said end closure portions in an end related superposing relation thereto, spacer means being provided between said shield and said one end Serial No. 333,902 closure portion to form therebetween an interior chamber, said shield and said one end closure portion being con-structed and arranged to provide for a flow of air past said shield to said chamber to fill said chamber and to flow to the interior of said housing by way of apertures in said one end closure portion, said shield being formed to influence a rapid movement of the air from said chamber to the interior of said housing.
6. A drive motor unit according to claim 1, said end closure portions having resilient means mounted thereto projecting substantially radially of said housing, at the exterior thereof,and means mounting between and bridging portions of said projecting resilient means which together with said resilient means are constructed and arranged to provide a resilient mount for said motor unit embodying handle means which are thereby non-conductively related to said armature assembly and generally coextensive with and spaced outwardly from said shell.
7. A drive motor unit according to claim 6 wherein said resilient means mounting to said end closure portions are separable from said end closure portions, spaced at their outer limits by said handle means and clamped be-tween said end closure portions at the inner limits thereof and said handle means comprise a series of circumferentially spaced longitudinally extending tube elements made of a relatively rigid material.
Serial No. 333,902
Serial No. 333,902
8. A drive motor unit according to claim 7 wherein said shell, said end closure portions, said resilient means and said tube elements are constructed and arranged to be separable from one another on removal of said end closure portions from said shell and means interconnect and apply pressure to contain said end closure portions to each other and with reference to the respective ends of said shell to thereby clamp said resilient means and the tube elements, which extend therebetween,in an area generally within the limits of said end closure portions.
9. A drive motor unit according to claim 7, said housing having an electrical switch mechanism mounted to the exterior thereof, one of said tube elements position-ing in overlying protective relation to said switch mechanism and being spaced a distance from companion tube elements allowing the hand of an operator free access to said switch mechanism.
10. A drive motor unit for an internal vibrator or like device, including a motor housing, resilient non-conductive motor mounts positioned on and spaced longi-tudinally of said housing, within the limits thereof, said resilient mounts including portions projecting sub-stantially radially of said housing whereby said motor unit at rest on a supporting surface has said housing relatively elevated with the longitudinal axis thereof substantially parallel to a supporting surface, and spacer elements Serial No. 333,902 interconnecting projecting portions of said mounts and orienting in circumferentially spaced relation to one another and in substantially parallel, spaced relation to said housing, providing a plurality of selectively usable hand holds for the motor housing which lie clear of said housing and within the limits of its respective ends.
11. A drive motor unit according to claim 10, in-cluding a switch mechanism mounted to said housing, ex-teriorly thereof, one of said spacer elements positioning in overlying protective relation to said switch mechanism and being spaced apart a distance from companion spacer elements allowing the hand of an operator free access to said switch mechanism.
12. A drive motor unit according to claim 10, said housing comprising a tubular shell open to each of its opposite ends, said shell being a non-conductive member having non-conductive end closure portions applied to its respective ends, one of said end closure portions having a through bore accommodating a non-conductive extension of a shaft, said shaft mounting an armature assembly within said housing and being rotatably supported within said housing in and with respect to bearing means fixed in the respective end closure portions, said shell having in fixed relation thereto a field assembly in surrounding Serial No. 333,902 relation to said armature assembly in said housing and means mounting electrical brush means operatively related to said armature assembly, said end closure portions having portions with which said resilient mounts have end abutting engagement, and said spacer elements being constructed and arranged and applied to said resilient mounts to maintain said resilient mounts in a seated relation to said end closure portions.
13. Apparatus as in claim 1 wherein said one end closure portion includes an axial extension projected outwardly about and in spaced relation to said sleeve and said extension embodies means for coupling thereto a protective cover for the operating portion of the tool device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3831479A | 1979-05-11 | 1979-05-11 | |
| US038,314 | 1979-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1124298A true CA1124298A (en) | 1982-05-25 |
Family
ID=21899225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA333,902A Expired CA1124298A (en) | 1979-05-11 | 1979-08-16 | Drive unit for flexshaft vibrators |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS55150752A (en) |
| CA (1) | CA1124298A (en) |
| DE (1) | DE3003092A1 (en) |
| GB (1) | GB2049301A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111725937A (en) * | 2019-03-21 | 2020-09-29 | 佛山市威灵洗涤电机制造有限公司 | Motor end cover and motor |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8533802U1 (en) * | 1985-11-30 | 1987-01-08 | Siemens AG, 1000 Berlin und 8000 München | Small engine |
| JP6363533B2 (en) * | 2015-02-25 | 2018-07-25 | トヨタ自動車株式会社 | Electric vehicle storage device for hybrid vehicle |
| JP6608711B2 (en) * | 2016-01-15 | 2019-11-20 | 株式会社Ｓｏｋｅｎ | Rotating electric machine and stator |
-
1979
- 1979-08-16 CA CA333,902A patent/CA1124298A/en not_active Expired
-
1980
- 1980-01-09 GB GB8000608A patent/GB2049301A/en not_active Withdrawn
- 1980-01-29 DE DE19803003092 patent/DE3003092A1/en not_active Withdrawn
- 1980-02-25 JP JP2261980A patent/JPS55150752A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111725937A (en) * | 2019-03-21 | 2020-09-29 | 佛山市威灵洗涤电机制造有限公司 | Motor end cover and motor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2049301A (en) | 1980-12-17 |
| JPS55150752A (en) | 1980-11-22 |
| DE3003092A1 (en) | 1980-11-20 |
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