US2348341A - Motor - Google Patents

Description

May 9, 1944.

J. J. GOUGH MOTOR Original Filed July 29, 1940 INVENTOR.

Patented May 9, 1944 MOTOR James J. Gough, Chicago, Ill., assignor to Chicago Electric Manufacturing Company, Chicago, 111., a corporation of Illinois Original application July 29. 1940, Serial No. 348,268. Divided and this application December 19, 1941, Serial N0. 423,669

4 Claims.

The present invention relates to a household or culinary appliance and more particularly to a combined mixer and juicer.

The invention yet more particularly contemplates an appliance of the foregoing class comprising an electrical drive motor adjustably associated with a supporting member so as to be readily shiftable between one position where the motor is operable to beat, whip or mix fiuid materials, and to another position wherein it is adapted to receive a suitable juicer reamer for xtracting fluid juices.

The present application is a diivsion of my (to-pending application, Serial No. 348,268, filed July 29, 1940, now Patent No. 2,317,098, April 20, 1943. In accordance with the invention, there is provided an appliance wherein a'drive motor housing presents outwardly extending drive shaft means on one side only and wherein the housing is associated with its support in either of a pin: rality of operative positions so that the shaft is presented in proper position for the particular operation desired. The invention contemplates such a structure which provides a strong and rigid support regardless of the position of the drive means.

An important object of the present invention contemplates the provision of an improved ventilating system operative to direct substantially all of the air actuated by a ventilating fan directlly through the interstices of the drive motor.

Another object of the present invention contemplates a housing and Ventilating construction for the drive motor wherein the several parts are permanently held together by a clamping band facilitating assembly and simplifying the general structure.

Among other objects of the present invention is to provide a housing structure as above adapted to accommodate and receive a housing bracket support in rigid permanent relationship and wherein the housing bracket supports and actuates the holding band for assembling the parts in unitary relationship.

A yet more specific object of the present invention contemplates the provision in a structure as above of an improved air blast directin shroud adapted to efficiently dissipate the heat of operation of the motor for prolonging the life thereof.

Yet other and further objects will be apparent from a consideration of the following specification and drawing, wherein- Figure 1 is an elevational view of a juicing and whipping unit constructed in accordance with the present invention and arranged in position for agitating the contents of a bowl illustrated in dotted lines.

Figure 2 is a detailed sectional view taken centrally through the motor housing of Figure l on the line 2--2 thereof.

Figure 3 is a sectional view taken across the motor housing of Figure 2 on the line 3-3 thereof.

Figure 4 is a perspective view of the air directing shroud of Figure 2.

\ Referring now more particularly to the figures of the drawing wherein one illustrative embodiment is disclosed, there is seen a juicing and heating appliance comprising a drive or actuating assembly I0 and a supporting base construction l2. The general arrangement of th s structure is disclosed more specifically in my aforesaid copending application but in general involves an actuating assembly 10 consisting of a motor housing I containing a suitable driving motor and a permanently assoc ated rigid supporting bracket assembly l6. portion of the housing project a pair of drive shafts l8 interengageable with whipper agitators l9 which may extend into a bowl represented by the dotted lines in Figure l. The supporting construction l2 comprises a flat base 20 from one margin of which projects upwardly a pedestal 22 engageable with the driving unit as clearly shown in Figure 1. More spectiflcally, a pin 24 engaged by opposed notches 26 in the bracket construction may support the driving unit with the shafts in downwardly projecting relationship or alternatively may serve to permit reversal of the parts with the shafts extending upwardly and the opposite extremity of the housing seated in a suitable recess (not shown) in plate 20, whereby the construction is adapted to withstand any' substantial stresses which might be applied during the process of reaming a fruit.

The bracket construction more particularly includes an outer or manually engageable handle bracket section 28 and inner or bracing bracket sectiops 30 secured to each other b a fastener 32. and to the motor housing by means which will hereinafter appear more in detail.

In accordance with the present invention and as shown in Figures 1, 2 and 3. the housing of the driving assembly includes an upper domeshaped shell and a lower concave section 36. Each of the sections is provided with annular curved side walls flanged radially outwardly along their inner margins as at 3B. The rad ally extending flange terminate in an axially extending From the lower flange section 4|! in order to provide opposed axially spaced recesses which, as will be seen in Figure 2, receive the opposite marginal corners of the laminated core 42 of the electric drive motor 44. In order to hold the upper and lower shells I4 and 86 axially upon the laminated core 42 in the position shown, there is provided an annular clamping band 48 extending about the flanges 38 and 40. To this end, the band is supplied along opposed longitudinal merging with inwardly projecting flanges 48 adapted to embrace and oppositely grip the flange portions 24 of the housing sections. Accordingly, when the two housing sections are received upon the laminated core of the motor and oppositely held in position by the marginal flanges of the clamping band, the entire motor cover is maintained in permanent, assembled position.

It is to be noted that the band 48 is in turn maintained in gripping position by means including projecting fingers or lugs 50 formed on the longitudinal extremities thereof for engagement by the bracket plates 30. The projecting lugs or extremities 50 may be merely outwardly or radially bent endportions of the band, as shown, and Figure 3 discloses the manner in which these members extend inside the spaced plates 30 forming the bracket section. Each of the comple mentary brackets 30 is in turn provided at'its extremity with upper and lower laterally turned lugs 52 received within slots 54 in the respective housing sections 84 and 84. It will be apparent that the lateral lugs or extensions 52 extend within the housing and engage behind the walls thereof to prevent outward withdrawal of the bracket. On the other hand, the plates are supported against internal collapse by virtue of the fact that they rest against the gripping band lugs 50. The plates 30 are moreover clamped in the position shown by means of a fastener 58. Accordingly, it will be seen that the fastener 56 serves the function of attaching the bracket members 30 to the housing and holding the clamping band 48 in operative position for locking the housing parts together. It will be seen therefore that the internal or bracing portion of the bracket construction I is rigidly fastened to the housing and to the handle section 2! of the bracket. In order to complete the rigid truss construction, an extremity of the handle section is rigidly fastened to the upper extremity of the housing by means of a machine screw 54.

Particular attention is directed to the internal ventilating construction cooperating with the motor 44 and involving a fan impeller 60 mounted on the upper projecting portion of the motor drive shaft 62. Preferably, the fan is configurated to direct air downwardly, wherefore apertures 64 on the upper shell or housing 34 are furnished to supply a current of air passing inwardly and thence downwardly about the motor and exhausting through lower elongated slots or apertures 66 in the lower housing section. It has been particularly noted that in many of the conventional constructions the aerodynamic design is such that the cooling impeller permits the air to circulate inefficiently within housing portions requiring no cooling. In other words, there is frequently a tendency to induce circulation at points remote from the heat creating portion of the motor, resulting in ineffectiveness of the cooling system and loss of power. The present invention contemplates the propulsion of all of the cooling air directly against and through the motor. In short, the present invention concentrates the direction of cooling air upon the motor parts which require cooling.

To this end, there is provided an inner shell or shroud I8 (see Figures 2, '3 and 4) formed of sheet metal and having an annular conical side wall 10 forming the main body portion. The conical side wall, at its lower or wider extremity, merges with an outwardly extending wall portion 12 in turn terminating in a downwardly projected annular shell engaging flange 14. The upper portion of the conical body member terminates in a radially inwardly extending flange I6. This shroud or cowling is provided with an axial slot 18 for accommodating the power or control conduit of the motor and every effort is made to reduce this aperture to such degree as to snugly accommodate the conduit and prevent air leakage. Preferably this aperture is omitted when it is possible to relocate the conduit in the lower portion of the housing.

Particular attention is directed to the manner in which the cowling or shroud is operatively received within the housing as shown in Figures 2 and 3 wherein it will be noted that the lower portion of the dome-shaped shell 34 snugly embraces and engages the annular, axially extending flange 14. In short, the flange 14 is so conflgurated as to be complementarily received just within the marginal extremity of the housing section 34 where it abuts edgewise against the upper face of the laminated motor core 42 and is disposed just outwardly of the motor bearing supporting brackets Oil. In short, it will be evident that during assembly it is merely necessary to insert the cowling "into the upper housing in the position shown Just prior to assembly of the housing parts, whereupon application of the clamping band will assure permanent maintename in assembled position.

Attention is further directed to the fact that the inwardly extending flange 16 at the narrow margin of the conical the margin of the fan impeller 60. It will be obvious from the foregoing that the shroud necessitates axial downward flow of all of the air handled by the fan blade and directs the air axially upon and through the interstices of the motor. Thus, the air drawn laterally through the apertures or slots 84 is caused to change to a direction of flow at right angles and axially of the motor and is maintained in a uniform stream in this direction. Thus, it will be seen that the lateral flow of air is prevented from impinging upon the peripheral or centrifugal draft normally set up by such fan impellers and is caused to shift to an axial direction before engaging with the fan blades.

It will be apparent from the foregoing that this improvement prevents interference with the incoming draft of air as would occur if the blade tips of the fan impeller 60 were disposed opposite the apertures 68 as shown without an intervening wall. Accordingly, therefore, the present construction permits the blades to be disposed relatively high in the housing or, in other words, close to an axial extremity thereof in order to facilitate construction of a relatively compact portions of the side walls of the housing wherein they are less apt to receive and pick up dust and particles of material under treatment. In short, the present construction not only necessitates blade to set up radial and peshroud slightly embraces 1 ripheral flow of air but provides a simplified improved structure capable of rapid assembly.

The present device, as shown in Figure 2, fur ther comprises a gear drive including a pinion 82 aihxed to the lower extremity of the drive shaft 82 and engaging both of a pair of gears 84 disposed within a gear transmission housing 88 having a cover 88 suitably riveted or otherwise fastened to the housing by any suitable meansnot shown. Projecting sleeves or bushings 80 on the transmission housing 86 extend downwardly about journal portions of the shafts I8 and oil sealing collars 82 on the shafts I8 may bear against the lower faces of these bushings to prevent leakage of lubricant.

More specifically, cup-shaped collars 82 are rigidly fastened to the shafts in the position shown by sweating or brazing and may cooperate with felt washers 84 let into annular recesses at the lower extremities of the sleeves 88. While the felt washer thus retained is effective to resist leakage of oil, it has been found that the felt may sometimes become soaked. Accordingly, it will be appreciated that the oil sealing collars or cups 82 cooperate to trap the oil within an area or cavity between the collar and the adjacent surfaces of the sleeves 88. Accordingly, the lower ends of the sleeves 80 are relieved or recessed to accommodate and receive the collars in slightly spaced relation. In other words, while the central portion of each collar makes a tight sealing fit upon the shafts, the radial portions thereof extend outwardly to engage the felt washer 84 and the upwardly or axially extending wall portions project about the walls of the bushing while spaced therefrom a substantial distance providing a cavity to prevent oil from creeping and thus retain lubricant within the cup. It will be understood, however, that the spacing of the parts is such as to retain lubricant even though the driving motor instrumentality is disposed and operated in inverted position.

It should be noted that the beater or whipper units 18 couple with the stub shafts l8 by virtue of the interlocking construction shown in Figure 2 and comprising a sleeve 86 rigid with the upper extremity of each beater for embracing the lower end of the stub shaft. Each of the respective interengageable shafts are complementarily relieved on opposite sides of a central axial plane as clearly shown for engagement against rela-' tive rotation. Inother words, each of the shafts is provided with complementary radial abutment surfaces as well as bevelled portions to facilitate entry of the stub shaft l8 into the recess formed in the companion shaft.

A resilient spring arm 88 afiixed to the lower extremity of the sleeve 88 extends thereabove and is apertured to embrace the shaft l8. By virtue of a normal resilient tension exerted in a lateral direction, the shaft embracing portion tends to engage in an annular groove in the shaft 18. Accordingly, the present structure axially latches the parts which, meanwhile, are interlocked against relative rotation and may be readily released at any time by manual manip-,

ulation.

The present invention provides a simplified, readily assemblable construction wherein the parts are adapted to operate efliciently without overheating. It has been observed that the present structure provides a device requiring little or no attention or service.

The invention obviously is not limited to the specific structural arrangement disclosed herein but is capable of other modifications and changes without departing from the spirit and scope of the present invention.

1 claim:

1. In a mixing and agitating appliance, a driving unit comprising a motor, a housing axially embracing the motor and having axially spaced inlet and outlet apertures for accommodating a flow of air through said housing, an air impeller means driven by the motor and located within the housing adjacent one axial extremity of the housing, and an annular shroud member at one end edge embracing said impeller and having its other end edge circumjacent the periphery of said motor for directing said flow of air in its entirety axially of the motor and through the' interstices thereof in direct cooling relationship.

2. In a mixing and agitating appliance, a driving unit comprising a motor, a housing axially embracing the motor and having axially spaced inlet and outlet apertures for accommodating a flow of air through said housing, an air impeller means driven by the motor and located within the housing adjacent one axial extremity of said housing, and an annular shroud member at one extremity abutting the side wall of the housing and extending circumjacent the periphery of said motor for directing said flow of air in its entirety along the motor and through the interstices thereof in direct cooling relationship, said shroud member having an inwardly extending annular flange formed adjacent the extremity spaced from said motor and overlapping the peripheral edge of said air impeller.

3. In a mixing and agitating appliance, a driving unit comprising a motor, including an annularly extending core portion coaxial therewith, a housing axially embracing and supporting said core portion of the motor and extending beyond said core portion at opposite ends thereof, said housing having axially spaced inlet and outlet apertures for accommodating a flow of cooling air, an air fan impeller within said housing radially opposite at least one of said apertures, and an annular shroud member within said housing in radially spaced relation thereto and between the fan impeller and the housing, said shroud member at one and edge circumferentially abutting the housing and being supported by the core portion of the motor, said shroud member at its other end edge enclosing the circumferential tip portions of said impeller for directing air axially of said motor through the interstices thereof.

4. In a mixing and agitating appliance, a driving unit comprising a motor, a housing axially embracing the motor and having axially spaced air inlet and outlet apertures in the side walls of the housing for permitting a flow of air radially into and out of said housing, an air impeller means driven by the motor and located within the housing adjacent oneaxial extremity of said housing, and an annular shroud member within said housing in radially spaced relation thereto at the inlet apertures, said shroud member at one end edge embracing said impeller and having its other end edge circumjacent the periphery of said motor and circumferentially abutting the housing for directing said flow of air in its entirety axially of the motor and through the interstices thereof in direct cooling relationship.

JAMES J. GOUGH.

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