US2432067A

US2432067A - Appliance switch at attachment cord anchorage

Info

Publication number: US2432067A
Application number: US553826A
Authority: US
Inventors: Shirley P Morse
Original assignee: AC Gilbert Co
Current assignee: AC Gilbert Co
Priority date: 1944-09-13
Filing date: 1944-09-13
Publication date: 1947-12-02
Anticipated expiration: 1964-12-02

Description

Dec. 2, 1947. s, MORSE 2,432,067

APPLIANCE SWITCH AT ATTACHMENT CORD ANCHORAGE Filed Sept. 15, 1944 4 Sheets-Sheet l INVENTOR F W I I 5 f ATTORNEY Dec. 2, 1947. s. P. MORSE APPLIANCE SWITCH AT ATTACHMENT CORD ANCHORAGE Filed Sept. 13, 1944 4 Sheets-Sheet 2 I'Lll INVENTOR Dec. 2, 1947.

S. P. MORSE APPLIANCE SWITCH AT ATTACHMENT CORD ANCH ORAGE Filed Sept. 15, 1944. 4 Sheets-Sheet 5 ATTORNEY Dec. 2, 1947. 5, MORSE 2,432,067

APPLIANCE SWITCH AT ATTACHMENT CORD ANCHORAGE Filed Sept. 15, 1944 '4 Sheets-Sheet 4 ATTORNEY I Patented Dec. 2, 1947 APPLIANCE SWITCH AT ATTACHMENT CORD ANCHORAGE Shirley P. Morse, East Haven, Conn, ass gnor to The A. 0. Gilbert Company, New Haven, Conn, a corporation of Maryland Application September 13, 1944, Serial No. 553,825

23 Claims.

This invention relates to portable, hand maneuvered electric appliances. Some of the present improvements are equally useful in a large variety of such appliances while other improvements are particularly concerned with appliances equipped with motor powered tools such as hair cutters for dry shaving, drills, power driven tooth brushes, erasers, etc. The particular motor driven appliance herein chosen to illustrate certain features of the invention is a hair drier incorporating a blower fan and an electrical resistance unit for heating the outblown stream of air.

A structural feature somewhat common to such appliances is an overall casing, usually elongated, and housing an electric power motor. Such casing is equipped with, or shaped to serve as, a handle by means of which the appliance is manually grasped and maneuvered. It is a more recent practice to provide such appliances with an electric attachment cord entering the elongated casing coaxially at the end thereof remote from the applicative end of the appliance and to incorporate at such handle end of the casin a conveniently manipulated electric switch governing the current fed through the attachment cord to the motor or other translative unit within the casing.

Since it contributes to good balancing, ease of handling and appealing streamlined appearance, the switch containing end of the casing in modern practice is tapered, rounded or torpedolike in shape, This considerably reduces the room available at such location for the bindin posts, the base, and the circuit making and breaking mechanism of an electric switch. Particularly in appliances that are so small as to be graspable in the palm of the hand, room for electric switching mechanism is practically unavailable in any other parts of the casing because the latter so closely hugs the motor body which it houses.

Accordingly one objective of the present improvements is to incorporate Working parts of an electric switch in efficient form together with a rugged protective anchorage for the electric attachment cord both within the very restricted quarters that are available at the above described torpedo-shaped end of a tapering or streamlined electrical appliance.

Another object is to prevent interference with the working parts of the electric switch by outside pulling on the attachment cord in any direction.

Another object is so to construct such switch that it can control more than one independent circuit for energizing in predetermined relationship a plurality of electric translative devices within the casing, all energized by current delivcred through a common attachment cord. I

Another object is to provide an actuating handle for such switch which shall conform externally to the outside contours of the casing and preferably not project appreciably therebeyond.

An object of the improvements pertaining particularly to a portable hair drier includes provision for optional use of the blower motor alone, or of the blower motor together with an air heater, whereby the operator is afforded a choice of blowing heated or unheated air out of the nozzle of the appliance.

A further object is to place the motor, or heaviest part of the casing contained mechanism, in that portion of the casing which is held within the grasp of the operators hand, instead of placing the center of gravity of the appliance in offset relation to the operator's hand that is used to wield the appliance. This greatly reduces the muscular exertion of the wrist that is required to maneuver the appliance quickly into different positions of use.

The foregoing and other objects of the invenblower nozzle of a hot-or-cold hair drying appliance incorporating the present improvements.

Fig. 2 is a side view taken for the most part in section on the plane 22 in Figs. 1 and 4.

Fig. 3 is a plan view with most of the structure of the head cap omitted.

Fig. 4 is a view taken in cross section on the plane 1-14 in Figs. 2 and 5.

Fig. 5 is an enlarged fragmentary view taken in section on the planes 5-5 in Fig. 4.

Fig. 6 is a diagram of electric circuit connections.

Fig. '7 is a fragmentary view taken in section on the plane 1--'! in Fig. 2.

Fig. 8 shows an exploded assemblage of the electric switch parts viewed in perspective from their inner or concave sides.

Fig. 9 shows an exploded assemblage of the same parts as Fig. 8 viewed in perspective from their outer or convex sides with slight modification in shape of the ring handle of the switch.

Fig. 10 is a view taken in section on the plane l0--IB in Fig. 2 looking in the direction of the arrows.

Fig. 11 is a view otherwise like Fig. 5 showing a modified construction.

Fig. 12 is a view showing the modified construction of Fig. 11 in section on a plane corresponding to 22 in Fig. 4.

The main housing of the appliance is composed of two major separable hollow casing sections, the larger section ID of which is L-shaped and consists of an upwardly opening head portion ll that is continuous and rigid with a depending stock portion l2, the latter being elongated and streamlined terminating at a bottom end having the shape of a torpedo nose. The casing stock i2 is axially elongated and of suitable diameter to be grasped in the palm of an operators hand and encircled by the operators fingers. The otherwise open top of head portion H is capped by a shallow cover l3 removably secured thereto by screws l4. Either or both sections of this housing may be made of molded plastic material and thereby electrically insulative. The casing stool: I2 is approximately filled by the body of an electric motor [5 illustrative of an electrical translative device and one of whose ends is fixedly but removably secured by holding screws I! to anchored lugs l8 formed internally on the casing stock 42, and whose body is fitting engaged and steadied by circumferentially spaced ribs l8 projecting from the inside of the wall of stock 12 so as to afford air passageways between said ribs and between the motor body and the casing stock I 2 from one end of the motor to the other. From the other or top end of motor Hi there projects upward the armature shaft 2| of the motor on which shaft there is fixed by a set screw 22 the hub of an air impeller or centrifugal fan 23. Just above and axially aligned with impeller 23 a shallow hood 24 is formed internally on the cover l3 to cause air that is sucked inward of the casing to be directed downward toward the hub of impeller 23 and internally of this hood through openings 25 in the cover. Rapid rotation of impeller 23 throws the air admitted through openings 25 outward horizontally from the casing through a nozzle aperture 29 which is spanned by horizontal grid bars 39 mounted by means of their border frame 3| that is lodged jointly and removably between casing head H and cover 13. Thus this grid structure is released for removal when the cover is separated from the casing head.

Between impeller 23 and the grid bars 39 there is firmly supported another electrical translative device in the form .of a stationary heater winding of electrical resistance wire 32 mounted on a ,refractory electrical and heat insulative core 33 which in turn is fixedly mounted by screws 34 on the head portion l l of the casing section 10.

The bottom end of casing stock E2 carries an assemblage of electric switch and attachment 90rd anchorage parts shown in Figs. 2 and 5. These parts are shown separated and on a larger scale in isometric drawing in Figs. 8 and 9.

To attain the combined objectives, first, of providing fixed sturdy constraint and anchorage for the attachment cord 40 in its region of entrance into the end of the casing stock l2 centrally through a current switching mechanism and, sec-- 0nd, of providing suitable room and support for desirably large and well spaced moving parts of the switch mechanism so that such parts can move proper distances with a snap action for selectively controlling commercial voltage circuits that separately include the heater wire 32 and the motor IS, the casing stock I2 is made to provide rotary bearing support for an annular switch handle 62 at the bottom end of the casing. While such bearing support might be circularly continuous or might consist of surfaces formed externally on the material of the casing stock l2, itself, the bearing support herein illustrated is afforded by two axially spaced and circularl interrupted annular chamfered

shoulders

65 and 66 of differ ing diametrical sizes formed externally on a skeletonized, cup-shaped switch base M of insulative material. Either or both of

shoulders

65 and 66 might be supplemented or replaced by circular bearing surfaces formed internally of the cupshaped switch base 4| 01' sometimes on the casing stock I 2, itself.

Switch base 4] as a unit is removably secured against the bottom or outer surfaces of lugs iii of easing stock l2 b means or the same screws I! that have threaded engagement with motor ii for mounting the latter firmly against the top of inner surfaces of these lugs. There are clamped under the heads of screws ll two diametrically opposite, inward directed flanges 42 forming floor portions of two niches bordered by inwardly curved sections of the peripheral wall of switch base 4! and which accommodate the heads of screws ll. A cross wall or web wall 44 of the same insulative material as switch base 41 completes the structure of the latter and is penetrated centrally by an axially extending tubular conduit member or structure 43 fixed therein of considerably smaller compass than the circular bearing

shoulders

85, 66 and coaxial with same. Cross wall 44 spans an opening at the bottom end of casing l2 and provides at 43 an inlet of smaller compass than such opening to admit the attachment cord 40. Thus web wall 44, conduit member 43 and

bearing support

65, 66 comprise a rigid unitary structure removably attached to the casing of the appliance. Conduit member 43 is preferably rigid and may be of metal or insulative material and 'n fixedly embedded in web wall 44 during the molding to shape of the switch base thereby to penetrate said inlet and serve as a guide bushing for the attachment cord. If preferred, conduit member .43 may be made a molded homogeneous extension of the insulative material of the switch base 4!. It will be seen that web Wall 44 is radially intermediate the bearing support surfaces or 55 and the conduit member 43, as well as rigid with both said conduit member and the mounting flange 42 of the switch base thereby to hold said conduit member in its firm fixed relation to casing stock 1.2. Attachment cord 40 is provided with a molded armoring sheath 49 at its appliance connecting end and the sheath terminates in an oversize bead or flange 3'! that prevents withdrawal of the attachment cord outward from conduit member 43 by overhanging the inner end thereof.

The peripheral wall of the switch base between bearing

surfaces

65 and 66 is designated 88 and is of channel nature in relation to said bearing surfaces. Cut-outs 56 in the peripheral wall of switch base 4| afford generous passage for air sucked into th casing ID by fan 23 for cooling motor l5 by flowing upward between ribs It.

The upper or inner face of web wall 44 has fixedly secured thereagainst by

rivets

48, 49, 50 and 5|, three metallic, bent-angular, bindingpost tabs 45, 4S and 41 for the removable attachment of electric circuit wires and which are related in electrical polarity as evident from Figs. 4 and 6. Since Web wall 44 is removable with switch base 4| from the appliance casing l2, the

attachment cord wires

39, 82 and 83 can be connected to binding posts 5%, 49 and 48 while the attachment cord is separated from the appliance casing. The opposite headed ends of these rivets form circuit terminals and are somewhat sunken in counterbores at the mouths of holes in web wall 44 through which the rivets extend. Three additional and similar blank counterbores are shown at 52, 53 and 54. All of said counterbores are radially

intermediate bearing support

65, 86 and the conduit member 43 and are spaced apart in a common circular track concentric with the common axial center of housing stock I2 and of conduit member 43.

The circuit making and breaking elements of the switch are of neutral polarity and include three electrically

conductive contact balls

51, 58 and 59, each of like and suitable diameter to seat far enough into any of the counterbores in web wall 44 to make electric contact in various combinations with stationary switch contacts afforded by the heads of

rivets

48, 49, 50 and 5|. These balls are maintained constantly at the same fixed circular spacing one from another regardless of what varible absolute positions they occupy in relation to the several counterbores and circuit connected rivet heads in web wall 44. This is because the balls are respectively caged by openings in flange-like projections 80, 64 extending radially inward from the rim 6! of a hollow annular switch handle 62. Thus these flanges serve as cage structure and afford handle actuated means operative to shift

balls

51, 58 and 59 in unison into and out of different counterbores in Web wall 44. larger in diameter than the thickness of flanges El] and 64 each ball presents a conductive surface,

that is accessible from the axially outer side of the ring handle 62 of the switch. The openings referred to may take the forms of holes 84 slightly larger than the balls as shown in Fig. 8 or may comprise notches 85 slightly wider than the balls as shown in Fig. 9.

The outer surface of. rim 6! forms a smooth continuation of the exterior contour of the housing stock l2 but is perforated by circumferentially separated elongated apertures 53 serving the double purpose of afiording better finger grasp of the annular switch handle and admitting air sucked in by fan 23 for cooling motor l5. The coaxial, conically disposed,

chamiered shoulders

65 and 66 on switch base 4| afford rotary bearing support for the rim 6| of hollow switch handle 62 by hosting into the same with a fit permitting free swiveling motion thereof. A retainer in the form of thrust nut '54 provided with wrench receptive sockets '58 has threaded engagement with the bottom end of conduit member 43 and presents a fiat thrust face to switch handle 62 positioned to leave the latter free to swivel without undue As the balls are centered with and Lil looseness. Nut 14 conforms in external contour with the torpedo-end shape of casing stock I2 and in assemblage is set up firmly against the ends of stationary posts H and 12 fixedly upstanding from switch base 4|. A spacer collar 11 of insulative material sleeves conduit member 43. A similar insulative collar sleeves the innermost end of this conduit member.

As

conductive balls

51, 5B and 59 are shifted in unison in an arcuate path or orbit about conduit member 43 or 9| by swiveling movement of switch handle 62, each ball passes from one to another of detent holes 68 in the non-rotating ball bridging pressor plate 61 of conductive material. Holes 68 are of a size to permit the balls to project only a little therethrough whereby plate 6! constantly presses axially against all of the balls simultaneously under the urge of spring coil 13. This spring surrounds conduit member 43 and is constantly under axial compression between pressor plate 6! and retaining nut l4. Pressor plate El also has two key way notches 69, it slidably engaged with the said stationary posts I i, 52. This leaves plate 61 free to slide axially but prevents rotation thereof. The inner diameter of plate 61 may have a plate centering fit on sleeve ll permitting free axial sliding of the plate.

Either of posts ll, 12 can be engaged at times by one or the other of .

ball impelling flanges

60 and 64 of switch handle 62 and thereby serve as stops limiting the extent of swiveling movement of the switch handle in both rotary directions as evident in Fig. 10.

The flexible attachment cord 4! contains at least the two flexible current supply wires 38 and t9, the former of which as shown in Fig. 6 connects electrically to both the motor 55 and the heater winding 32 while the former connects to the binding post 4'! as best shown in Figs. l, 5 and 6. These electrical connections of Various wires to the binding posts are preferabl made by tying each wire through a hole in its binding post and then soldering the wire to the binding post so that the joint will be secure both electrically and mechanically. In this manner lead wire 82 electrically connects binding post 49 with the motor l5 and a separate lead wire 83 connects binding post 48 with the heater resistance wire 32 completing the electrical circuits diagrammed in Fig. 6. 8t represents a resilient leaf contact biased to separate automatically from binding post contact 81 if overheating in the appliance melts a drop of solder normally holding 86 and 8'! in electrical contact whereby a safety cut-out or automatic circuit breaker is provided to guard against short circuit overloads or other fire hazards.

The operation of my improved appliance will for the most part be evident from the foregoing description of its construction. In the case of the hair drier here illustrated the operator will grasp the casing stock l2 in the palm of either hand with the thumb naturally uppermost or at the head portion ll of the casing. This places the large preponderance of weight of the appliance inside the grasp of the operators hand. The head H and its contents are so relatively light as to present no appreciable load to the wrist muscles of the holders hand in maneuvering the appliance quickly to different positions for blowing air out of the nozzle aperture 29, as for drying hair.

The attachment cord id always trails the appliance of course and together with the switch handle 62 falls clear of the little finger side of the operators hand so that the switch handle 62 is readily grasped at any time by the fingers of the operators other hand and turned in either direction to any one of three different positions which are visibly indicated by the registering of indicium 81 on the ring with any one of the three words Off, Cold, or"I-Iot, marked on the bottom end of the casing stock l2 as shown in Fig. 1. Air inlet apertures 63 are large enough slightly to admit the flesh of the operators fingers to facilitate a grasp of switch handle 62 for turning it.

When indicium Bl registers 01f, the three contact balls 5?, 58 and 59 occupy respectively the three

blank counterbores

52, 53 and 54 in the insulative wall 44. Both the motor i5 and the heater 32 are then deprived of current and idle. Upon turning switch handle 82 so that indicium 8| registers Cold, the said

contact balls

51 and 59 will be swung in unison and become seated in contact with

rivets

49 and 50 while ball 5% simultaneously occupies the vacant counterbore 52 whereupon current from the attachment cord supply wire 39 passes through binding post clip 41, rivet 58, contact balls 59, pressor plate 61, contact ball lil, rivet 49, binding post terminal 46, lead wire 82 and thus through motor l5 which is constantly in circuit with the return wire 33 of the attachment cord. Now motor l5 will be energized to the exclusion of the heater unit 32 and will rotate impeller 23 to blow air out of nozzle 29 unheated by the heater unit 32.

When indicium 8| is turned to register with Hot, contact balls 51, 58 and 5d will be seated respectively in counterbores against the heads of rivets 48, G9 and 5| as shown diagrammatically in Fig. 6. Here it is seen that current passes through motor l5 as in the Cold position of the switch handle but in addition the heater unit 32 now is energized simultaneously with motor l5 by circuit through attachment cord 39, binding post 41, rivet 5i, contact ball 59, pressor plate 61, contact ball 5'5, rivet 48, terminal clip 45, lead wire 83, and the heater unit 32 which is constantly in circuit with the return wire 38 of the attachment cord. Now air blown out of nozzle 29 by the fan 23 will be heated by the heater unit 32.

The user is thus given the option of heated or unheated air by the mere shifting of position of switch handle 62, which also can cut out of circuit all of the electrical translative devices in whatever appliance may be equipped with the improvements hereof.

Turning of this switch handle in either direction beyond the Off position and the Hot position is prevented by the stop posts H and 12 as hereinbefore explained. Each of the contact balls falls into its counterbore with a naturally quick circuit breaking movement expedited by the thrust of spring-backed pressor plate 61. In being forced to roll sidewise by the loosely engaging

switch handle flanges

60 or 54, each ball because of the seating pressure of spring 13 and the sharp rim edges of the counterbores resists leaving its seat in the counterbore in web wall 44 until increasing manual turning urge is built up in muscles of the operators hand, whereupon a very abrupt popping up of all three balls simultaneously out of their respective recesses takes place producing a quick circuit breaking or "snap action of the current controlling parts which eifectively prevents sparking and pitting of the contacts. The contact balls may be made of bronze, brass or other metal of good conductivity. When any of the circuit making balls reaches a position for droppin into any one of the counterbores over the sharp rim thereof, the before men tioned looseness of fit of each ball in lateral relation to its hole or notch in either handle

flange

60 or 64 permits the axial urge of pressor plate 81 to snap the ball smartly into its rivet contacting, fully seated position in the counterbore so that quick making as well as quick breaking of the circuit occurs.

It will be obvious from Figs. 2 and 5 that no sidewise tugging on attachment cord 46 can act in any way to impair or interfere with the free action of the circuit making and breaking parts of the switch because the cord is at all times anchored against withdrawal from conduit member 43 at the innermost side of both the casing and the circuit switching mechanism by means of the bead 31 of its armoring sheath 4!) and is positively constrained laterally by the rigidity of conduit member 43 which extends from the outermost side to the innermost side of both the casing and the circuit switching mechanism.

Figs. 11 and 12 show a modified construction wherein a modified form of base 85 is composed of a fiat disc of insulative material removably secured to the lugs [6 of the casing stock [2 by fiat headed screws 93 passing through clearance holes in said lugs and having threaded engagement with motor it. This flat switch base 88 may be provided with the same kind and arrangement of counterbores, rivets, and binding posts as is the cross or web wall 44 of the cup-shaped switch base 48 in Fig. 5. Modified switch base 89 will also support in fixed relation thereto a somewhat modified form of rigid conduit member 9| projecting axially outward therefrom and providing rotor bearing support for a modified form of switch handle 92. This form of switch handle has a hub 93 rotatably supported on conduit memher 9! and includes between hub 93 and its peripheral rim portion 94 an impelling plate :15 of insulative material detachably fixed thereto by screws or other suitable means and closely flanking the flat switch base 89 and provided with either holes or notches similar to 84 or 85 in the flanges E0 and 64 of the cupped switch handle 62.

In the hollow interior of switch handle 92 a current carrying member or pressor plate 95 surrounds the hub 93 and is urged axially against the contact balls by the axially compressed spring $7 in a manner to present its annular fiat face into contact with all the balls and thus bridge the balls conductively. Spring 87 is loosely coiled about hub 93. Since this pressor plate 95 is free to turn in unison with the switch handle, it need not have ball seating apertures such as 58 in pressor plate 6'1.

Retaining thrust for the modified switch handle 92 may be provided by a nut 98 which after the fashion of nut "i4 threads onto the outer end of conduit member 9i and tightly against a shoulder thereon at the end of the threads being thus positively and fixedly positioned to give full freedom of switch handle 92 to turn in rotary unison with spring 9?, pressor plate 95 and

contact balls

57, 58 and 59. Retainer 93 is shaped and disposed to complete the enclosure of a hollow space in outboard relation to the said ring handle, said space bein occupied by switch handle and by the current carrying pressor plate Q5.

As each contact ball jumps up out or" or each into one of the counterbores in the switch base 89 quick making and/or breaking of the circuit will occur as in the case of the switch of Fig. 5. The flat Witch base 89 and the impelling plate the travel of

contact balls

51, 58 and 59 as is also the spring 91,

As the two possible forms of embodiments of the invention which are herein disclosed Will be informative to those skilled in the art of many other modifications that may be based on the principles of construction and arrangement underlying this invention, the appended claims are intended to cover and apply to all parts and arrangement that are obvious equivalents for those disclosed herein insofar as same come fairly within the intended scope and meaning of the claim definitions.

I claim:

1. In a portable electrical appliance containing an electrical translative device adapted to be connected in circuit with an appliance attachment cord, the combination with said cord of, a casing carrying and housing said device, electric circuit controlling mechanism at one end of said casing, and a tubular member rigid with said casing forming a constraining conduit for said cord extending from the outermost side to the innermost side both of said casing and of said circuit switching mechanism centrally of the latter, said attachment cord being anchored against withdrawal from said conduit at the innermost side of both said casing and said circuit switching mechanism.

2. In a portable electrical appliance containing an electrical translative device adapted to be connected in circuit with an appliance attachment cord, the combination with said cord of, a casing carrying and housing said device having an opening to admit said attachment cord, a cross wall spanning said opening containing an inlet of smaller compass than said opening, electric circuit controlling mechanism at the outer side of said cross wall, circuit terminals at the inner side of said cross wall, a current conducting attachment cord extending past said circuit controlling mechanism and into said casing through said inlet thereby to reach said circuit terminals, and means at the inner side of said cross wall operative to prevent withdrawal of said attachment cord from said cross wall.

3. In a portable electrical appliance as described in claim 2, the combination defined in said claim, together with a, rigid guide bushing sleeving the said attachment cord and penetrating the said inlet in rigid relation to the said cross wall.

4. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination of, an axially elongated casing carrying and housing said device, rotary bearing support at one end of said casing circularly disposed near the periphery thereof, a tubular conduit member of smaller compass than said hearing support joined fixedly and coaxially therewith and opening into said casing in a manner to admit therethrough said attachment cord and restrict lateral deflection of the latter, a web wall radia ly intermediate said conduit member and said bearing support rigid with both said conduit member and said casing for supporting the conduit member in fixed relation to the casing, at least one electric switch element movable between circuit controlling positions stationed radially intermediate said tubular conduit member and said circularly disposed bearing support, a switch handle guided by said bearing support for turning movement relative to said casing, and handle actuated means operative to shift said element from one to another of said positions.

5. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, together with at least one circuit terminal stationed on said web wall radially intermediate the said conduit memher and the said bearing support in position to be conductively contacted by the said contact element.

6. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, together with at least one binding post for the attachment of an electric wire of the said attachment cord mounted on the axially inner side of said web wall, and a stationary circuit terminal on the axially outer side of said web wall electrically connected with said binding post and positioned to be conductively contacted by the said contact element.

7. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, together with a second electric contact element movable between different circuit controlling positions stationed radially intermediate the said conduit member and the said bearing support, both of the said contact elements being on the axially outer side of the said web wall, a conductive element bridging plate stationed to contact electrically with both of said contact elements, and means to stay said plate against movement with said elements in at least one direction.

8. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, in which the said rotary bearing support and the said switch handle are cooperatively shaped and relatively disposed to nest one within the other thereby to reduce the extent of axial space occupied jointly by said support and handle.

9. In a, portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, together with a thrust nut having threaded engagement with the said conduit member shaped and positioned to retain the said switch handle turnably sleeved upon the said bearing support.

10. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, in which the said web wall is removably attached to the said casing of the appliance, together with binding posts on the axially inner side of said web wall for attachment of conductive wires of the said attachment cord, whereby said wires may be connected or disconnected from said binding posts while the attachment cord is separated from the appliance casing.

11. In a ortable elect ical appliance containing an electrical translative device connectable in 11 circuit with an appliance attachment cord, the combination defined in claim 4, in which the said web wall and the said conduit member and the said bearing support comprise a rigid unitary structure removably attached to the said casing of the appliance.

12. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, in which the said web wall, the said conduit member and the said bearing support comprise a unitary cupped structure removably attached to the said casing with the concave side of said structure facing the casing in a manner to hold said web wall at a maximum axial distance from the latter thereby to allow maximum room for attachment cord connections within the hollow of said cupped structure and to save room within the casing.

13. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, together with a thrust nut having threaded engagement with the said conduit member shaped and positioned to retain the said switch handle turnably sleeved upon the said bearing support, the electric switch element being axially confined between said thrust nut and the said web wall,

14. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, in which the said rotary bearing support and the said switch handle are cooperatively shaped and relatively disposed to nest one within the other in telescoping manner, both said support and said handle having apertures in their relatively telescoped peripheral walls disposed to admit ambient air therethrough to the interior of the said casing for cooling the said electrical translative device.

15. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, in which there are a plurality of the said electric switch elements of neutral polarity movable between the said circuit controlling positions, together with an electrically driven fan inside of the said casing and an electric heater in the path of air propelled by said fan inside of said casing, and plural electric circuits containing said motor and heater, said circuits respectively including circuit terminals of relatively opposite polarity stationed to be conductively bridged in difierent combinations through contact with said electric switch ele merits in the said different circuit controlling positions or the latter.

16. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, in which the said electric switch element Comprises a conductive ball, and the said handle actuated means include a cage structure carried by the said switch handle and loosely flanking the said ball for impelling the latter from one to another of its said diiierent circuit controlling positions.

17. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined in claim 4, in which a plurality of conductive balls comprise a plurality of the said electric switch elements, and the said handle actuated means includes a cage structure 12 carried by the said switch handle impellingly engaging said balls in a manner constantly to main-- tain'the latter at fixed spacing from one another.

18. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination of, an open ended axially elongated casing carrying and housing said device, a cross wall spanning an open end of said casing, a tubular conduit member in fixed relation to said cross wall penetrating the same and opening into said casing in a manner to admit said attachment cord through said member and restrain said cord against lateral deflection, at least one electric switch element movable between circuit controlling positions stationed in circular arrangement about said tubular conduit member, a switch handle rotatably supported on said conduit member for turning movement relative to said casing, and handle actuated means operative to shift said element from one to another of said positions.

19. In a portable electrical appliance containing an electrical translative device connectable in circuit with an appliance attachment cord, the combination defined by claim 18, in which the said cross wall comprises a plate removably attached to the said casing, together with stationary electric circuit terminals carried by said plate in the path of movement of the said switch element.

20. A portable electrical appliance comprising, in combination, a motor housing elongated axially of the motor forming a handle for grasping and maneuvering the appliance, a rigid tubular conduit stationary with one end of said housing in end-to-end relation to said motor, a ring-like switch handle mounted for turning movement about said conduit relatively to said housing, electrical connections for the motor including circuit switching elements, at least one of said elements being impellable to different circuit switching positions by turning movement of said ring handle and having exposed to the outboard side of said ring handle an electrically conductive surface, a retainer for said ring handle on said conduit at the outboard side of said ring handle stationed by said conduit against turning movement relative to said housing, and a circuit connected current carrying member located between said retainer and said ring handle contacting conductively with said exposed surface of the impellable circuit switching element in various of the latters said positions for feeding motor energizing current thereto.

21. A portable electrical appliance as defined in claim 20, in which the said circuit switching elements comprise balls rollable in an orbit about the said conduit, and the said current carrying member comprises a plate in broadside relation to said orbit bearing simultaneously and conductively against a plurality of said balls, and the said retainer is shaped and disposed to complete the enclosure of a hollow space in outboard relation to the said ring handle said space being occupied by said current carrying member.

22. A portable electrical appliance as defined in claim 20, in which the said circuit switching ele ments comprise balls rollable in a common orbit about the said conduit, and the said current carrying member comprises a plate free to rotate presenting an annular flat surface into conductive contact simultaneously with a plurality of said balls.

23. A portable electrical appliance as defined in claim 20, in which the said stationary retainer is shaped and disposed to complete the enclosure of a hollow space in outboard relation to the said UNITED STATES PATENTS ring handle, together With a spring arranged un- Number ame Date der tension in said space between the said current ,03 ,126 Kuhn et a1 Aug, 20, 1912 carrying member and the said retainer in a man- 5 ,624,374 SWoboda Apr. 12, 1927 ner to thrust the former axially against the said 1,88 ,865 Schneider Nov. 1, 1932 circuit switching element. 2,08 ,264 Scruggs June 1, 1937 2,194,619 Scruggs Mar. 26, 1940 SHIRLEY P. MORSE. 05,482 Krieger June 25, 1940 10 2,293,015 Cohen Aug. 11, 1942 REFERENCES CITED 1,508,735 V/eiss Sept, 16, 1924 1,259,170 Trautman Mar. 12, 1918 The following references are of record in the 2,055,867 Kuehne Sept- 29, 1936 file of this patent: