US2693542A - Electric motor - Google Patents

Description

J. E. VANCE ELECTRIC MOTOR Nov. 2, 1954 .5 Sheets-Sheet 1 Filed Jan. 30, 1952 II v INVENTOR. John E. Vance BY g TTOHNE Y.

Nov. 2, 1954 J, E, VANCE 2,693,542

ELECTRIC MOTOR Filed Jan. 30, 1952 '3 Shasta-Sheet 2 I ii 4-H q \jmwnmm'fi myzuron. John E; Vance TTORNEY.

. BY I, I

ELECTRIC MOTOR Filed Jan. 30, 1952 3 Sheets-Sheet 3 INVENTOH. John E Vance BY TTORNE Y.

United States Patent ELECTRIC MOTOR John E. Vance, Canton, Ohio, assignor to The Hoover Company, North Canton, Ohio, a corporation of Ohio Application January 30, 1952, Serial No. 269,069 Claims. (Cl. 310-89) The present invention relates to an electric motor and more particularly to assembly of its parts and arrangement in portable electrical appliances such as suction cleaners. v

An object of the invention is to provide a motor housing formed in two sections in one of which all of the parts are assembled through an opening in the parting line of the housing prior to attaching the cover section. Another object is to provide two cooperating motor housing sections in one of which the brush holders are inserted through openings on the parting line of the housing and attached independently of the caps for the brush holders. A further object is to provide a motor which is arranged in a suction cleaner to reduce the height of the cleaner body. Other objects and advantages of the invention will become apparent from the following description and drawings, wherein:

Figure 1 is a longitudinal section showing the motor in the cleaner casing;

Figure 2 is a bottom view of the cleaner body with the motor removed;

Figure 3 is a section along the line 3-3 of Figure 1; and

Figure 4 is an exploded perspective view of the motor housing with the motor arranged in one housing section.

The embodiment of the invention herein disclosed comprises a cleaner body having an exterior shell provided with a nozzle front and side wall 11, an upwardly and rearwardly inclined front wall 12, spaced rearwardly extending side walls 13-13 and a top wall 14. The front wall 12 has an opening 15 for receiving an unshown converter to alter the cleaner for otf-the-fioor cleaning and is provided with a cover 16 movably mounted on a suitable hinge 17. The marginal edges of the depending side walls 13 define'an setting a fan casing section 19 and a motor housing 20. A cleaner propelling handle 21, only partially shown, is pivotally mounted on bolts 22 atached to the depending side walls 13 of the outer shell 10.

The fan casing section wall 23 and an annular side wall 24 to form part of a fan chamber 25 having an inlet 26 and a discharge conduit 27, the latter projected through a complementary opening in the outer shell 10 for attachment of an unshown filter bag. Below the fan chamber annular wall 24 is a wall 29 which cooperates with the nozzle wall 11 to form a nozzle 30 having a mouth 31, the latter communicating through an air passageway 32 with the fan chamber inlet 26. The fan casing section 19 is inserted in the shell 10 through the assembly opening 18 and has bearing surfaces 33-34 abutting the outer shell 10, and the section 19 is secured to the outer shell 10 by a pair of bolts 35 extending through lugs 36 and threaded into the outer shell 10. A pair of front wheels 37 are attached to the nozzle wall 11 and a bracket 38 on the fan casing section 19, and rear wheels 39 are secured to brackets 40 on the outer shell 10.

The motor housing 20 is molded of electric insulating material and includes a parts assembly section 41 and a cover section 42 secured together by three bolts 43. Housing sections 41 and 42 are joined together at a parting line 44 parallel to the axis of an armature shaft 45, and the parts assembly section 41 extends beyond the armature axis, as shown in Figure 3, to provide an assembly section larger than the cover section for complete arrangement of the motor parts prior opening 18 for in- 19 is provided with a front i recesses 89-89 in the housing sections 2,693,542 Patented Nov. 2, 1954 to attaching the cover 42. Disposed within the housing 20 is an armature 46 provided with a commutator 47 mounted on the shaft which is supported in a rear bearing 48 and a front bearing 49 nested respectively in a recess 50 and 51 molded in the casing section 41. The rear bearing 48 is secured to the assembly section 41 by a spring clamp and bolt 52. The front bearing 49 includes a retainer plate 53 bearing against a wall 54 in both housing sections and the peripheral edge 55 is seated between spaced lugs 56 molded in the housing sections and the wall 54 to prevent axial movement of the front bearing 49, and the latter is retained against lateral shifting by a clamp and bolts 58 secured in the assembly section 41. A substantially U-shaped field stack 60 seats in a recess 61 in the housing section 41 and has its bight portion 62 and field coil 63 disposed along the upper side of the armature 46. A bolt 64 secures the field stack 60 in the recess 61 of the assembly section 41.

A pair of brushes 65 for the commutator 47 are slidably mounted in metallic brush holders 66 each seated in a three-sided recess 67 completely formed in the assembly section 41 and each recess is exposed at the parting line 44 for inserting the brush holders 66 into the housing section 41. Each brush holder 66 is secured in the recess 67 by a brass retainer plate 68 extending across the mouth of the recess in the parting line 44 and is attached to the assembly casing section by a bolt 69. One end 70 of the retainers bears against one wall of the recess 67 to position the retainers across the recess mouth. The retainers 68 also form an electrical connection with the brushes 65 and the latter are connected to the motor and a switch 73. The switch 73 is supported on a ledge 75 in the outer shell and has an operating member 76 projecting through an opening 77 in a cover 78 in the top wall 14 of the outer shell.

Formed in the assembly section 41 beyond the outer ends of the brush holders 66 is a three-sided recess 80 which non-rotably supports a fastener 81 inserted at the parting line 44 and interiorly threaded for reception of a brush cap 82. A spring 83 in each brush holder 66 extends between the motor brush 65 and through the fastener 81 to the cap 82, the latter controlling removable insertion of the brush 65 and spring 83. The

brush caps 82 from the exterior of the housing. The upper opening 85 is positioned below an opening 86 in the outer shell 10 for removably inserting the motor brush 65 and spring 83 in the upper brush holder 66 while the motor housing is in the shell 10. The opening 86 is closed by the cover 78 removably attached to the outer shell 10 and the cover is provided with inlet openings 87 for entrance of motor cooling air.

A ventilating fan chamber 88 is formed by cooperating 41-42 and the latter section is provided with an unshown peripheral opening for discharge of air from the fan chamber 88. Disposed in the ventilating fan chamber 88 is a fan 90 supported on the shaft 45 for drawing motor cooling air through the inlets 87 in the shell cover 78 and an inlet 91 formed in the cover section 42 and then over the coil 63, field stack 60 and the commutator 47 into the chamber 88 from which it is discharged through the unshown port.

A front wall 93 of each housing section cooperates to form the rear wall of the suction fan chamber 25 having a fan 96 supported on the shaft 45. The shaft 45 projects through the fan chamber inlet 26 into the suction air passageway 32 and is provided with a pulley 97 for a belt 98 connected to an agitator 99 rotatably mounted in the nozzle 30. The motor housing 20 is attached to the fan casing section 19 by a plurality of bolts passing through holes 100 in the wall 93 into lugs 101 formed on the fan casing section 19.

It will be noted that all the parts of the motor are mounted in the assembly housing section 41 and rigidly held in position prior to assembly of the cover section 42. The brush holders 66 are inserted through the opening in the parting line 44 into their respective recesses 67 and held therein by the brush retainers 68 which also are exposed at the parting line of the housing assembly section. In addition, axial movement of the front bearing 49 is prevented by the bearing flange 53 being seated between the molded projections 56 and one wall 54 of the bearing recess. Attachment of the cover section 42 by the bolts 43 completes the housing 20 and the air inlet 91 for motor ventilating air, and also'the rear wall of the fan chamber 25.

- In order to assemble the motor housing 20 in the outer shell 10, the housing 20 is first secured to the fan casing section 19 by threading bolts through the openings 100 into the lugs 101 to form a unitary fan casing and motor housing. The combined fan casing and motor housing is then passed through the opening 18 in the bottom of the outer shell to bring the bearing surfaces 33-34 into abutment with the outer shell 10 and thereafter the bolts 35 are passed through the nozzle mouth 31 and threaded into the outer shell 10, and the Wall 29 of the fan casing section 19 completes'the nozzle 30. The belt 98 is then placed on the pulley 97 through the converter port bymoving the cover 16 to its open position.

The motor housing 20, when positioned in'the outer shell, extends downwardly and rearwardly from the fan casing section 19 with the bight 62 of the U-shaped field stack and coil 63 arranged completely above the top side of the armature 46 and rearwardly of the commutator 47 to thereby position the field stack at the rearmost and lowest portion of the armature shaft 45 to reduce the vertical height of the cleaner. If it is desired to remove the top motor brush, the cover 78 is detached to expose the opening 85 for access to the brush cap 82, spring 83 and brush 65 in the top brush holder. Access to the lower motor brush is had by up-ending the cleaner body to expose the opening 18 in the outer shell 10 for removal of the lower brush cap 82.

When it is desired to clean a carpet the switch 73 is actuated to energize the motor causing rotation of the fans 90 and 96 and the argitator 99. The dirt-laden air stream passes through the nozzle 30 and fan inlet 26 into the fan chamber 25 from which it is discharged through the outlet 27 into an unshown dirt filtering bag. The

ventilating fan 90 draws motor cooling air through the openings 87 in the cover 78 and the adjacent inlet 91 into the housing 20, thence over the coil 63, field stack 60 and 2. A brush assembly for a dynamo electric machine having a motor housing of insulating material, an armature in said housing, said housing formed in a parts assembly section and a cooperating cover section having a parting line parallel to the axis of said armature, said parts assembly section extending beyond the axis of said armature, a brush mounting including means forming a brush holder recess in said parts assembly section and having an opening exposed to said parting line for inserting a brushholder into said recess, a brush and spring in said holder, means forming an irregular recess in said parts assembling section open to said parting line for inserting cap fastener means non-rotatably in said irregular recess, said fastener means being independent of said brush holder and said spring extending through said fastener means, a cap connected to said fastener means to secure said brush and spring in said holder, and means attaching said sections together to complete said housing.

3. A brush assembly for a dynamo electric machine, a housing for said machine, an armature in said housing, said housing formed in a parts assembly section and a cooperating cover section having a parting line parallel to the axis of said armature, said parts assembly section extending beyond the axis of said armature, a brush mounting in said parts assembly section including means forming a brush holder recess having an opening exposed at said parting line, a brush holder inserted through said opening into said recess, retainer means mounted on said parts assembly section at said parting line and extending across said opening to said recess into engagement with said brush holder to secure the latter in said recess, and means attaching said cover section to said parts assembly section. e

4. In a dynamo electric machine as in claim 2, and retainer means mounted on said parts assembly section at said parting line and extending across said opening in said brush holder recess into engagement with said brush holder to secure the latter in said recess.

commutator 47 into the fan chamber 88 from which it is discharged through an unshown peripheral opening.

, While I have shown and described but one embodiment of my invention, it is to be understood that this embodiment is to be taken as illustrative only and not in a limiting sense. I do not wish to be limited to the particular structure shown and described but to include all equivalent variations except as limited by the scope of the claims.

l. A brush assembly for a dynamo electric machine having a motor housing, means forming a bore in said housing, a brush holder in said bore, a brush and spring in said holder, means in said housing forming a recess, acap fastener non-rotatably mounted in said recess independently of said brush holder and said spring extending through said cap fastener, and a cap attached to said fastener to secure said brush and spring in said holder.

5. A motor assembly for a dynamo electric machine having a motor housing formed-of a parts assembly sectron and a cover section, an armature in said housing, a bearing for said armature in said housing, means forming a walled recess in said parts assembly section for said bearing, said bearing having a flange exterior of said recess and bearing against a wall thereof, and means integrally formed in said parts assembly section spaced from said recess wall and abutting said bearing flange to prevent axial movement of said bering in said housing.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,928,965 Dormeyer Oct. 3, 1933 2,040,188 Smellie May 12, 1936 2,141,920 Lenhart Dec. 27, 1938 2,246,270 Staak June 17, 1941 2,366,481 Berg Jan. 2, 1945 2,372,660 Coss Apr. ,3, 1945 2,644,190 Brown et a1. July 7, 1953

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