US2295965A - Suction cleaner - Google Patents

Description

F. L. PIERCE SUCTION CLEANER Filed Nov. 18, 1959 5m E5, w42.

2 Sheets-Sheet 1 INVENTOR Mam wg ATTORNEY Sept. 5, 1942. F. L.. PIERCE SUCTION CLEANER Filed Nov. 18, 1959 2 Sheets-Sheet 2 ATTORNEY Patente Sept. l5, 1942 UNITED STATES sUc'rxoN CLEANER Frank L. Pierce, Garden City, N. Y., assigner to The Hoover Company, North Canton, Ohio, a

corporation of Ohio 9 Claims.

The present invention relates to suction cleaners in general and more particularly to a new and novel construction for resiliently mounting a motor.

It is an object of the present invention to provide a new and improved suction cleaner construction. A further object is to provide a construction for maintaining a constant clearance between the labyrinth plate and fan. Another object is to provide a construction for resiliently supporting a motor bearing and a fan labyrinth plate as a unit. A further object is to provide means for resiliently mounting the motor, labyrinth plate and fan. Other objects and advantages of the invention will be apparent from the specification and drawings, wherein;

Figure 1 is a sectional view of a suction cleaner illustrating one embodiment of the invention;

Figure 2 is an exploded perspective view of the means for resiliently mounting the top motor bearing, and

Figure 3 is an exploded fragmentary perspective view of the means for resiliently mounting the bottom motor bearing.

The embodiment of the invention herein described comprises a suction cleaner having a main casing lo provided with a nozzle Il communicating through a suction passageway I2 with a fan chamber i3 discharging through an exhaust passageway I4 into a dust-filtering bag l5 removably attached to a ange I6 on the casing l0. Removably mounted on the casing l is a motor housing I3 of electric insulating material which encloses a motor I9 provided with a frame 20, eld stack 2l, field coil 22 and an armature 23 having its shaft 24 supported at its opposite ends in top and bottom bearings 25 and 26 respectively. Rigidly attached to the armature shaft 24 is a fan 21 and a pulley 28 which has driving connec-l tion with a belt 29 extending through the suction passageway l2 for operating a surface contacting member 30 rotatably mounted in the nozzle H. The casing I0 is supported on front and rear wheels 3| and 32 respectively and a handle 33 is pivoted on a bracket 34 for moving the cleaner over the surface to be cleaned.

The top bearing 25 includes an oil porous sleeve 35 rigidly supported between the bearing housing plates 31 and 38 which form a chamber containing oil-retaining material 39 to lubricate the porous sleeve bearing 36. The plates 31 and 38 have :their peripheral edges secured together and are rigldlyattached to a bearing supporting member 40 which is mounted on a projecting portion forms part of the motor bottom plate M. is a support the bearing 25 the member 4@ is provided with an annular collar 42 on which are spaced projections 43 seated in similarly spaced recesses 44 along the inner circumference of. a resilient ring 45. The ring 45 may be of rubber and is provided along its outer periphery with recesses 46 to receive similarly spaced projections 41 formed on a collar 48 depending integrally from the motor housing i8. Attached to the armature shaft 24, adjacent the sleeve bearing 36, is a ventilating fan 49 disposed in a chamber El) formed by the top wall 5I and the projecting wall 4l of the motor frame, the bearing supporting member 40 and the lower bearing housing plate 81.

The bottom bearing 26 comprises an oil-porous sleeve rigidly supported between a dislr t and a cup-shaped portion 51, the latter forming part of the motor bottom plate 58 which is removably attached to the motor` frame 20. Disposed be tween the 'disk 56 and the cup-shaped portion bi is oil-retaining material 59 to lubricate the sleeve bearing 55. The disk 56 is held in position with respect to the sleeve bearing E5 by means of a. depending collar 6o which is rigidly attached to the bottom plate 58 by annularly spaced pins el, the lower edge of the collar t@ bearing against the disk 5B. l In order to resiliently support the lower bearing construction 26 a resilient rubber ring 65 of inverted hat-shape configuration is interposed between the motor bottom plate 5t and a depending flange 1l defining an opening in a member t@ which is removably mounted on the casing l@ and forms the top wall of the fan chamber I3. The rubber ring B5 is supported by means of spaced recesses 14 in its outer periphery which receive the pins 6l and 15 projecting respectively from the motor bottom plate b3 and the fan chamber wall G6.

Attached to the bearing housing plate b1, which labyrinth plate 'lllhaving a depending peripheral flange 13 which is received in predetermined spaced relation in an annular groove 19 in the wall oi' the ian 21. This labyrinth construction prevents entrance of foreign material between the fan 21 and the labyrinth plate 11 and thus protects the bearing 26. A resilient rubber ring is mounted in a groove 8| provided in the fan chamber wall 6G and beers against the labyrinth plate 11 to prevent entrance of foreign material therebetween.

In operation, when the surface contacting member 30'is rotating the motor it will be sub- 4l of the motor frame 20. In order to resiliently 55 jected to a belt pull tending to tilt the fan 21 towards the nozzle il. Under these conditions the clearance between the labyrinth plate 11 and the fan 21 will remain substantially constant, since the labyrinth plate 11 is rigidly mounted on the bearing 26 and moves with the latter and the amature shaft 2t, such movement being permitted by the resilient rings 45 and 65. In maintaining a constant clearance between the fan 21 and labyrinth plate 11 any foreign material therebetween is not compressed and thus a drag on the motor i9 is prevented.

During operation of the motor the fan 21 vibrates, however the clearance between the labyrinth plate 11 and fan remains substantially constant since the bearing 26 and the attached labyrinth plate 11 and the bearing 25 are mounted in the resilient rings 45 and 65 so as to vibrate in unison with the fan 21,

When the motor is subjected to belt pull the resilient rings d5 and S5 will be in compression and tension, and when the motor is subjected to torsional vibration the rubber rings 45 and 85 will be subjected to a shearing stress. The projections 43 and 41 extending into the recesses in the resilient ring 45, and the pins 6| and 15 extending into the recesses in the lower rubber ring 65 prevent rotation of the motor due to torsional vibration.

From the foregoing it will be perceived that the upper and lower resilient rings 45 and 65 are easily assembled by registering projections in corresponding recesses, and that the rings 45 and 65 resiliently support the top and lower motor bearings, Since the labyrinth plate 11 is rigidly attached to the lower bearing housing it will move in unison with the fan 21 to thereby maintain substantially constant clearance between the fan and labyrinth plate. Also, since the bearings 25 and 26 and labyrinth plate 11 are all rigidly attached to the motor frame and the latter is at no point rigidly ailixed to the cleaner, but is resiliently mounted thereon by the rubber rings 45 and 65, the motor and its rigidly attached parts will be shifted as a unit whenever the motor is vibrated.

I claim:

1. A suction cleaner comprising a motor, a fan chamber having afan mounted on said motor, means for resiliently supporting said motor to permit vibration of the same, a labyrinth plate having a portion rigidly mounted on said resiliently supported motor and its unsupported portion spaced from said fan to prevent foreign material from entering therebetween, said labyrinth plate and fan vibrating in unison with said motor upon vibration of the latteron said resilient means to thereby maintain said clearance between said fan and labyrinth plate substantially constant.

2. A suction cleaner comprising a motor, bearing means for said motor, means for resiliently supporting said bearing means to permit vibration of said motor, a fan chamber having a fan rigidly on said motor, a labyrinth plate having its inner periphery rigidly attached to said resiliently mounted bearing means for movement therewith, said labyrinth plate having its outer periphery unsupported and spaced from said fan to prevent foreign material from entering therebetween, said labyrinth plate, bearing means and fan moving in unison with said motor upon vibration of the latter on said resilient means to thereby maintain said clearance between said fan and labyrinth plate substantially constant.

chamber, a fan in said chamber and mounted on said motor, spaced bearing means rigidly at tached to said motor and supporting the motor 3. A suction cleaner comprising a motor, a ian armature shaft, a labyrinth plate having its inner periphery rigidly attached to one of said spaced bearing means and its outer periphery unsupported, means for resiliently supporting saidspaced bearing means, said motor, spaced bearing means, fan and labyrinth plate moving as a unit in said resilient means upon vibration of said motor.

4. A suction cleaner comprising a motor, a frame for Said motor, a motor armature shaft bearing rigidly attached to said motor frame, means for supporting said motor frame, resilient means interposed between said motor frame and supporting means for resiliently supporting said motor to permit vibration of the latter with respect to said supporting means, a fan mounted on said motor, and a labyrinth plate rigidly attached to said bearing and having an unsupported portion spaced from said fan, whereby said motor frame, bearing, labyrinth plate and fan vibrate in unison to maintain a constant clearance between seid fan and labyrinth plate.

5. In a suction cleaner having a casing, a motor in a frame mounted on the casing and operating a fan, the combination of a bearing attached to the frame for the motor, a labyrinth plate having its inner periphery rigidly attached to said bearing and its outer periphery unsupported and spaced from said fan to prevent accumulation of foreign matter therebetween, and resilient means interposed between said motor frame and casing for resiliently supporting said motor frame on said casing, the motor, fan, bearing and labyrinth plate moving as a unit in said resilient means with respect to said casing upon vibration of said motor.

6. In a suction cleaner having a casing, a motor in a frame mounted on the casing and operating a ian, the combination of a bearing attached to the trame for the motor, a labyrinth plate having its inner periphery rigidly attached to said bearing and its outer periphery unsupported and spaced from said fan, resilient means interposed between said motor frame and casing for resiliently supporting said motor frame on said casing, means for subjecting said resilient means to shearing stress upon torsional vibration of said motor frame, said bearing and labyrinth plate moving as a unit with said motor frame upon torsional vibration of said motor frame.

7. A motor-fan unit comprising a casing for said fan and supporting said motor, a bearing attached to said motor, a labyrinth plate having its inner periphery rigidly attached to said bearing and its outer periphery unsupported and spaced from said fan, and resilient means interposed between said casing and motor for resiliently supporting the latter with respect to said casing, the motor, fan, bearing and labyrinth plate moving as a unit in said resilient means with respect to said casing upon vibration of said motor.

8. A suction cleaner comprising a motor. a fan chamber, a fan in said chamber and mounted on said motor, a labyrinth plate between the back of said ian and a wall of said fan chamber to prevent foreign material from entering between said fan and labyrinth plate, said labyrinth plate being unsupported at its outer portion, and resilient means between said ian chamber wall and said labyrinth plate toprevent foreign mateto close said opening in said wall to said fan rial from entering therebetween. chamber, and a labyrinth plate between said 9. A suction cleaner comprising a motor, a fan fan and said fan chamber wall and unsupported chamber having an opening in a wall thereof at its outer portion to prevent foreign material through which the motor shaft extends into said 6 yfrom entering between said fan and labyrinth chamber, a. i'an in said chamber and mounted on plate. y said motor shaft, resilient means in said open- FRANK L. PIERCE. ing for resiliently supporting said motor and also

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