US1863043A - Motor support for ventilating fans - Google Patents

Description

J1me 1932- c. E. JOHNSON MOTOR SUPPORT FOR VENTILATING FANS Filed Jan.- 13, 1951 w MW 3 4 ATTaQ/VE 4 Patented June 14, 1932 more!) STATES PATENT OFFICE CARL E. JOHNSON, OF PASADENA, CALIFORNIA MOTOR SUPPORT FOR VENTILATING FANS Application filed January 13, 1931. Serial No. 508,481. 7

\ mission of vibrations from the motorto the fan. These transmitted vibrations cause noises which are conveyed through the ventilating pipe associated with the fan. Such a practice, therefore, of connecting a motor to a ventilating fan is very objectionable in theatres and halls where absolute quiet is necessary.

It is an object of my invention to eliminate this objectionable feature resulting from the present practice of attaching the motor directly to the fan by providing a structure for accomplishing this attachment which will absorb or damp out the vibrations of the motor so that they are not transmitted to the fan.

To accomplish this purpose I provide a resilient means adapted to be interposed in the connection between the motor and the fan. With such a construction it is desirable that the motor should be adapted to be easily, quickly and adjustably attached through-the resilient means to the fan.

It is a corresponding purpose of my invention to provide a construction for attaching a motor to aian which permits the motor to be easily and quickly attached to the fan through a resilient means and in such a manner that this attachment is adjustable. I It is a further object of my invention to provide such a construction of a sufiiciently rigid nature to require little or no attention or repairs.

It is still another object of my invention to provide a construction of the class described in which the parts most apt to be worn may be easily replaced and cheaply manufactured.

To illustrate my means of accomplishing the foregoing ob ects, and others, some of which will be made evident hereinafter, I will describe a preferred and alternative form of embodiment of my invention, these embodiments being illustrated in the drawing.

In the drawing, which is for illustrative purposes only,

Fig. 1 is a partially sectioned view of the 5.1 motor support of my invention.

Fig. 2 is a view taken as indicated by the line 22 of Fig. 1.

Fig. 3 is a fragmentary view of an alternative form of my invention. co

Referring to the drawing, and particularly to Fig. 1, the numeral 11 indicates an electric motor which includes a stator 12 and a rotor13. The motor 11 may be of conventional induction type, but is preferably 05 of the variable-speed type, such as those motors having wound rotors or dual-wound stators. The rotor 13 is non-rotatably secured to a shaft 14, which is mounted in bearings 15. The bearings 15 are disposed in bearing recesses 16 formed by an inwardly extending annular flange 17 on each of two endbells 18. Each of the end-bells 18 is provided with a cylindrical, inwardly extending side wall 19, on the inner surface of which is formed an inwardly extending annular shoulder 20. As illustrated in Fig 1, the annular shoulders 20 are adapted to cooperate to engage between them the sides of the stator 12. Each of the side walls 19 is 30 provided with an opening 21 therethrough parallel to the axis of the rotor 13 and for a purpose which will be later described.

The shaft 14 extends through a central 0 lindrical opening 22 formed in one of th 'e end-bells 18 and is non-rotatably secured as by a key 23 to a rotor 24 of a fan 25. Attached to the rotor 24 of the fan 25 is a series of blades 26 adapted to be rotated by the shaft 14 within a cylindrical casing 27.

- The ventilating fan 25 may be of the blower or exhaust type, the form herein illustrated including an inlet opening '28 in the side of the casing 27 and an outlet opening (not shown) in the periphery of the casing 27 The supporting structure of my invention indicated by the numeral 29 includes a ring v30 having openings 31 therein adapted to coincide with the openings 21 of the end-bells 18. The ring 30 is of a width substantially equal to the width of an annular flange 32 formed on the outer surface of each of the end-bells 18 so that the ring 30 may be positioned upon and secured to the flange 32. The ring 30 is provided with a plurality of radial arms 33, here shown as three in number, each of which is provided at its outer end with a hub portion 34 having a cylindrical opening therethrough parallel to the axis of the ring 30. As illustrated in Figs. 1 and 2, each of the arms 33 may be provided with a web 35 extending down its middle to provide additional strength.

Each of the hub portions 34 is adapted to receive a lining 36 of resilient material such as rubber, which extends throughout the length of the hub portion 34. The lining 36 provides a central cylindrical opening 37 adapted to receive a bolt 38.

The supporting structure of my invention includes also two end-plates 39 of a diameter slightly larger than the diameter of the hub portion 34. One of the end plates 39 is provided with a central cylindrical opening 40 having a diameter substantially equal to the external diameter of the lining 36. The other of the end plates 39 has a central cylindrical opening 40a of a diameter substantially equal to the diameter of the opening 37. Adapted to be positioned upon the bolt 38 adjacent each of the end plates 39 is a cylindrical pad 41 of resilient material such as rubber. Each of the pads 41 has an external diameter substantially equal to the external diameter of the end plates 39 and is provided with a central cylindrical bore 42 adapted to receive the bolt 38. The pads 41 abut against the end plates 39 and the ends of the lining 36.

As best illustrated in Fig. 1, one end of the bolt 38 is adapted to be threadedly received in a ring 43 which bears against the inner surface of the end of the casing 27. One of the pads 41 of resilient material is placed upon the bolt 38 adjacent the outer surface of the end of the casing 27 and that one of the end plates 39 having the larger central opening 40 is placed against this resilient pad 41. The lining 36 being assembled as indicated in Fig. 1 inside the hub portion 34 and around the bolt 38, the other one of the end plates 39 is placed adjacent the hub portion 34, and a second resilient pad 41 is positioned upon the bolt 38 so that it contacts that end plate 39. A second plate 44 is then positioned upon the bolt 38 so that it engages the other surface of the resilient pad 41. This entire assembly is held in proper position upon the'bolt 38 by a nut 45 screwed upon the end of the bolt 38 until the proper degree of compression of the pads 41 has been achieved.

The ring 30 is attached to the end-bells 18 by bolts 46 which pass through the openings 21 of the end-bells 18. As indicated in Fig.

1, the bolts 46 pass through the end-bells 18 after the end-bells have been positioned one on either side of the stator 12 so that when the bolts 46 are projected through the openings 31 in the ring 30 and secured in place by nuts 47 and lock washers 48, the end-bells 18 cooperate to lock the stator 12 in its proper position.

It should be noted that the bolts 46 operate to secure the end-bells 18, the stator 12, and the ring 30 all in their proper positions relative to each other. It should also be noted that only three bolts 38 are required to attach the arms 33 to the fan casing 27. It should be apparent that with such a construction the motor 11 may be adj ustably attached to the fan 25 so that the fan rotor 24 rotates in its proper relation to the fan casing 27. It should likewise be apparent that, by means of the three bolts 38 and the three nuts 45, the resilient pads 41 may be compressed to any extent desired so that the correct degree of resilient effect may be secured in the attachment between the motor 11 and the fan 25.

In Fig. 3 there is illustrated an alternative form of my invention which differs from the preferred form already described in that no ring 30 is required. Instead, each of the arms 33 is provided at its inner end with a hub portion 49 having an opening 50 adapted to permit the extension of one of the bolts 46 therethrough. Such an embodiment of my invention has the advantage of being somewhat cheaper in its manufacture than the preferred embodiment herein'before described.

In both embodiments of my invention the resilient pads 41 operate to absorb or damp out vibrations between the motor 11 and the fan 25 in the direction of the axis of the bolts 38. The resilient lining 36 operates to absorb or damp out vibrations perpendicular to this axis so that vibrations in whatever direction they may occur are diminished or eliminated between the motor 11 and the fan 25, and thus not transmitted to the fan 25. Such a construction, therefore, prevents the transmission through the ventilating pipes of those audible noises caused by the vi- W brations of the motor which have been proven objectionable in the present practice of attaching the motor to the fan. It is a feature of the invention that the resilient means 1 rotor 24 and the casing 27 should excessive vibration of the motor occur.

Inasmuch as the only parts of the supporting construction of my invention apt to be worn or to require replacement are the resilient pads 41 and the resilient linings 36, and inasmuch as these may be replaced simply by the removal of the three bolts 38, it should be apparent that I have by my invention provided a supporting structure in which the re lacement of the parts may be accompllshed by the expenditure of very little time and effort.

Although the embodiments of my invention hereinbefore illustrated and described are fully capable of performing those objects primarily stated, my invention may be embodied in various other forms, and consequently I do not wish to be restricted to those embodiments hereinbefore set forth.

I claim as my invention:

In a support construction for a motor driven fan, the combination of: a ring adapted to be attached to the casing of said motor; arms on said ring, each of said arms having an opening at its end; a resilient lining in each of said openings; a resilient pad on one side of each of said arms; and bolts adapted to extend through said openings and engaging said linings to adjustably secure a fan against said resilient pads.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 8 day of J an., 1931.

CARL E. JOHNSON.

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