US1815315A - Refrigerating apparatus - Google Patents

Description

' y 1, 1931. c. F. KETTERING 1,815,315

REFRIGERATING APPARATUS Filed April 13, 1927 5 Sheets-Sheet 1 y 1931- c. F. KETTERING 1,815,315

REFRIGERATING APPARATUS Filed April 15. 1927 s Sheets-Shet 2 y 21, 1931- c. F. KETTERING REFRIGERATING APPARATUS Filed April 15, 1927 3 Sheets-Sheet 3 Patented July 211, i935.

GEABLES F. KETTERING, OF DAYTON, OHIU, ASSEGNOR, BY MESNE ASSIGNMENTS, TU

FRIGIDA'IBE CQEPORATIGN, A

CURPORATION QB DELAWARE FIEFRIGERATKFTG APPARATUS Application filed April 523,

The present invention relates to mounting devices, apparatus having moving parts and it is among the objects of the present invention to minimize noises and vibrations and to dissipate those vibrations which may be created.

Une manner of carrying out the above object is to suspend the apparatus from a floating support the point of least vibration of the appai Mus.

Another object of the present invention is to vieldingiy resist the turning of the apparatus about its point of suspension and to yieldingly resist lateral movement of apparatus.

Further objects and advantages of the present invention will be'apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings:

Fig. 1 is a top plan View of the improved apparatus, as applied to a refrigerator,

Fig. 2 is a front view of the apparatus, the refrigerator disclosure being fragmentary and in section,

Fig. 3 is a sectional view taken on line 3-3 of Fig. l,

Fig. a is a fragmentary sectional view taken on line 4-4 of Fig. 1,

Fig. 5 is a fragmentary sectional view taken on line 5-5 of Fig. 1,

Fig. 6 is a fragmentary sectional view taken on line 6-6 of Fig. 2,

Fig. 7 is a fragmentary sectional View taken on line 7 7 of Fig. 6, and

Fig. 8 is a diagrammatic view of the apparatus.

Referring to the drawings, for the purpose of illustration, the improved mounting device'is herein shown as applied to a refrigerator in which 20 indicates a cabinet having a refrigerating compartment 21 and a machine compartment 22. Upright end posts 23, 24:, 25,-and 26 carry intermediate their ends, a frame comprising rails 28, 29, 30, and 31. An open top compartment lining 32 issecured tothese rails and is covered with insulating material 33. A platform 35 which 192?. serial No. 283,459.

constitutes the major portion of the top wall of compartment 21 is carried by the frame. The platform 35 includes rails 36, 37, 38, and 39 which rest upon the frame and from which depends a frame 4.0. Frame 28 extend-s into the opening formed by rails 28, 29, 80, and 81 and carries a cooling unit 41 a partition 42. Insulating material 43- for the topwall of the cabinet is carried within the frames.

An eiectric motor drives pulley :6 and a fan The pulley 46 drives a iiywheei pulley e8 of a compressor through a belt 00-. The compressor herein shown is of the recip ocating type and is connected by a suction pipe 51 with the cooling unit L1 and by a discharge pipe 52 with a condenser 53.

....e compressor 49 and motor 45 are carried by a base 55. This base includes paralleliy arranged angle iron bars 56 and 57 which are r the axis (indicated at 64.) of the crankshaft;

of said compressor; and these lugs are secured to the bars 56 and 57 by bolts 66. By mounting the compressor adjacent the axis of the compressor, vibration, tending to be created by the operation of the crankshaft and reciprocating piston, will be minimized.

As clearly shown in Fig. 6, a motor mounting plate 68 is secured to bars 56 and 57 by bolts 69. Rubber bushings 7 0 are secured to and held in place on the opposite sides of the plate 68 by straps 71 and screws 72. These bushings are each provided with a central opening arranged to snugly fit the reduced cylindrically shaped ends 73 of a rod 74. The middle portion of this rod is rectangular in contour to'provide a flat supporting face for a motor mounting bracket 75. This bracket is secured to the rod 7 1 by rivets 7 6 and suitably attached to the motor 45. By this construction and arran 'ement, the motor 45 is carried by the bushings 70, which bushings will absorb vibrations of the motor to thus dissipate motor hum and thereby prevent transmission of vibration to the base 55. This mounting also permits the motor to turn about the axis of the rod 7 4 for the purpose of readily adjusting the tension of belt 50. A 5 bracket 77 is secured to the motor 45 by the motor end cover screws 78 and includes an extending portion 79 carrying a vibration absorbing bushing such as rubber 79a which receives a rod 80. The lower end of the rod 80 0 is securedby one of the compressor mounting bolts 66; Portion 79 is adjustably clamped to the rod 80 by nuts 81. By adjusting the nuts 81, the motor 45 can be swung about the axis of'rod 74 to increase or decrease the belt tension.

In order to minimize vibration of the motor and compressor apparatus and to extinguish or absorb the vibrations which are created and to prevent the transfer of such vibrations to the platform 35, the base 55 is suspended V from a, floating support. I have discovered that this type of'support is most effective when applied at the center of oscillation of the ap-' paratus when freely suspended. Any suit able method canbe utilized in determining the center of oscillation of the apparatus For example, the entire apparatus can be suspended. from a plurality of long, li ht springs and theapparatus operated as un er normal condition. The point where the smallest amount ofmovement takes place will be the most desirable supporting point.

Byv experiment it has been found that the center of oscillation of the apparatus shown herein, during normal operation, is approximately at the point indicated at A in Fig. 8. Therefore, the apparatus is suspended from a floating support at this point. The support includes a plate 83- secured at the oppositeends thereof to rails 36 and 37 by screws 84. A IT-shaped upright 85 is suitably secured to plate 83 and the extending arms thereofcarry springs 86 and 87. The lower end of spring 86 is connected with a short strip 88, which strip is suitably secured to an angle iron bar 57. An l -shaped strip 89 is suitably secured to bar 56 and is perforated to receive a bolt 90 to which thelower end of spring 87 is connected. Bolt 90 is adapted to be raised or lowered by adjusting a nut 91.

l have also discovered that the center of oscillation shifts a certain amount due to various reasons, as for example difierences in speed, load, belt tension, etc., and although this center shifts to a certain degree from the point of suspensiomi desired results are still maintained. It is apparent then that for practical purposes, the point of suspension and the center of oscillation need not be coin-- cident. Therefore, if the center of oscillation should fall at a point, at which it would be difficult or expensive to suspend the apparatus, the point of suspension may be shifted 35 in any direction (preferably vertically) from the apparatus is not quite level.

the center of oscillation and still obtain substantial results.

In order to limit the oscillating movement of the apparatusfabout its support at the center of oscillation, I provide a resilient conmotion between the platform 35 and some.

than on the motor side.

In the present embodiment the resilient connection referred to comprises springs 93. Each spring 93 is connected at one end to an car 94, each of the ears being secured to one of the bars 56 or 57. The other end of each spring is attached to a clip 99 supported in a slot in a sleeve 96 threaded on the upper end of a stud. 95. This stud is secured to the rail 38 of platform35 and extends upwardly between and near the compressor end of the bars 56/ and 57 Thus the apparatus issupported in static balance, the springs 93 yielding enough to allow a certain amount of oscillation about the center of oscillation. Any vibration which would otherwise be transmitted to the platform is absorbed by the springs.

ally of the stud 95 and limit any lateral oscillation which may be set up, for example, when At the motorend of the apparatus there is provided a stud 101 which is secured to the "compressor side of thecenter of oscillation The springs 93, it will be noted, extend later- I rail 39 and disposed between bars 56 and 57.

Ears 102 are suitably secured to the bars 56 and 57 and springs 103 are each connected with one of the ears and with the stud v101. These springs extend laterally from the stud 101 and tend to limit the lateral movement of the motor end of the apparatus.

By virtue of the arrangement of the driving and driven members as a rigid mechanical apparatus, and the supporting of this apparatus in a manner to permit itsmovement underthe action of the forces set up by the normal operation of the driving and driven members, any forces which would otherwise be transmitted to the platform and cause vibration are dissipated by the acceleration of the mass which is necessary to produce such movement; and such vibrations that are present at the point of attachment are absorbed in the suspending springs 86 and 87. Therefore, substantially no vibrations@ are transmitted to the upright 85 and the base 35. Thus noises are substantially eliminated.

During the starting operation,'due to the essary to move the compressor from a static positiom the resistance ofi'ered the motor is difierent than during normal running, and,

torque of the motor and due to the forcenectherefore the center of oscillation is removed from the point A. Consequently the springs 93 will not provide the required balancin properties and the apparatus will tend to teeter slightly. In order to limit this teeter, a shock absorbing material such as felt 104 is disposed below the U-shaped tie strips 58 and 59 against which the strips may strike their down movement. Similar shock absorbing material 105 is provided above the strip 59 to limit the upward movement of strip 59 and likewise the base 55. The felt 105 is carried by a U-shaped member 106 threaded on thetically for the purpose of leveling the base,

and when level, the base will be in the position shown in the drawings.

Due to the fact that the compressor ismovable during operation, it is necessary to pro-- vide a yielding connection between the condenser 53 and the compressor. Therefore, the connecting pipe 52' is provided with'a large U-shaped portion 108 and the inlet pipe 51 is provided with a U-bencl 109 which will provide suflicient resiliency between said compressor and other parts of the system.

By virtue of the construction shown and described herein, noises are substantially eliminated. Vibrations are minimized and those vibrations which are created are dissipated before they are transmitted to the rigid support 85. Therefore, vibrations are not transmitted to the cabinet.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred form, it is to be understood that other Y forms might be adopted, all coming wit hin the scope of the claims which follow. What is claimed is as follows: 1. In combination, a system comprising a driven member and a driving member therefor, common means for supporting saidmembers, the movement of said members,

- .during normal operation, setting up oscillation of the system as a whole about an axis,

' and means for resiliently supporting the system substantially at said axis and means for yieldingly limiting the lateral movement of said system.

2. In combination, a system comprising a driven member and a driving member therefor, common means for supporting said members, the movement of said members, during normal operation, setting up oscillation of the system as a whole about an axis, means for yieldingly supporting the system substantially at said axis, and means for yieldingly resisting the turning of the system about said supporting means.

3. In combination, a system comprising a driven member and a driving member therefor, common means for supporting said members, the movement of said members, during normal operation, setting up oscillation of the system as a whole about an axis, means for yieldingly supporting the system substantially at said axis, and means for yieldingly resisting the turning of the system about said supporting means and for yieldingly resisting lateral movement of the system.

4. In combination, a system comprising a driven member and driving member therefor, common means for supporting said members, the movement of said members, during normal operation, setting up Oscillation of the system as a whole about an axis, means for resiliently supporting the system substantially at said axis, means on one side of ,said axis for resisting lateral movement of the system, and means on the other side of said axis for'augmenting the first resisting means and for yieldingly resisting the turning of the system about said resilient supporting means.

5. In combination, a system comprising a driven member and a driving member therefor, common means for supporting said members, the movement of sald members, during normal operation, settlng 11p oscillation of the system as a whole about an axis,

and supporting and bracing means for resiliently supporting the system substantially at said axis and for yieldingly limiting the lateral movement of said system.

In testimony whereof I hereto aflix my signature.

CHARLES KETTERING.

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