US2452807A - Sealed refrigeration unit - Google Patents

Description

Nov. 2,1948. THOMPSON 2,452,8(57

SEALED REFRIGERATION UNIT Filed may 19, 1945 s Sheets-Sheet 1 W Y I u S 5% INVEN TOR.

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r7 Tran/YE V Nov. 2, 1948. H. E. THOMPSON SEALED REFRIGERATION UNIT 'Filed May 19, 1945- :s Sheets-Sheet 2 M21 M2 mmvmn. v E E A44 g 'rr Z Ta fz pam \T M, YZIMQ 1948- r-:. E. THOMPSON 9 SEALED REFRIGERATION imm' Filed May 19, 1945 5 Shams-Sheet 3 Patented Nov. 2, 1948 UNITED STATES PATENT OFFICE 2,452,801. sump narmoanarlon Um'r Harry E. Thompson, Sidney, Ohio ApplicationMay 1c, 1945, Serial No. 594,637 8 Claims. (01. 230-58) This invention relates to sealed refrigeration units and has for its principal object the provision of,a new and novel form of mechanism for controlling the circuit to the starting windmechanically connected by means extending through the casing with the switch for operating the latter; the provision of a construction as above described in which the connecting means between the switch and the centrifugally operated mechanism on opposite sides of the casing includes a movable member projecting through the casing and sealed with respect thereto; the

provision of a construction as above described in which the movable member interconnecting the switch and the centrifugal mechanism is mounted for pivotal movement on the casing; the provision of a. construction as above described in which the movable member is sealed to the casing by means of a flexible member sealed to both it and to the casing; and the provision of a 'construction as above described in which theseal between the movable member and the casing comprises a flexible metallic member.

The above being among the objects of. the present invention the same "consists in, certain novel features of construction and combinations of parts to be hereinafter described withreference to the accompanying drawings, and then claimed, having the above and other objects in view.

In the accompanying drawings which illustrate suitable embodiments of the present invention and in which like numerals refer to like parts throughout the several different views,

Fig. 1 is a partially broken, partiallysectioned side elevational view of one form of sealed refrigerant motor compressor unit to which'fthe present invention is applicable;

Fig. 2 is a fragmentary, partially broken, partially sectioned view taken in the same plane as in Fig. 1 and showing the centrifugal actuated mechanism in side elevation, the centrifugal mechanism being shown in full lines in motor operation position;

Fig. 3 is an end elevatlonal view of the centrifugal mechanism shown in Fig. 2, taken on the line 3-3 of- Fig. 2;

Fig. 4 is an enlarged, fragmentary sectional view taken in the same plane as Fig. 1 and illustrating in greater detail the mounting of the connecting member between the centrifugally actuated mechanism and the switch, together with the seal therefor;

Figs. 5, 8, and 7 are views similar to Fig. 4 illustrating modified forms of construction;

Fig. 8 is a partially broken, partially sectioned view of a different form of scaled motor-compressor unit to which a modified form of the present-invention is shown applied; and,

Fig. 9 is an enlarged, fragmentary sectional view taken on the line 9-! of Fig. 8.

The present invention is applicable to substantially any conventional type of sealed motorcompressor unit for refrigerating systems or for other uses but, for the purpose of illustration, in the accompanying drawings it is shown in conjunction with a sealed motor-compressor unit of the general type illustrated in the U. S. Patent No. 2,035,276, issued March 24, 1936, to John R. Replogle on Refrigerant condensing unit, and owned by the assignee of-the present invention.

As indicated in Fig. 1 such motor-compressor unit may be briefly described as comprising a generally cylindrical casing or housing iii one end ofwhich is formed to provide a pair of cylinders l2 integral therewith and arranged with their axes perpendicular to the axis of the casing l0. Intermediate its ends the casing I 0 is provided with an. integral transverse apertured wall it centrally terminating in a hub portion IS in which a bearing I 8 is secured for rotatably supporting the hollow drive shaft 20. Press-fitted concentrically into the main portion of the casing I0 is the field structure, indicated generally at 22, of a conventional electric motor having a rotor indicated generally at 24 suitably fixed to the drive shaft 20 concentrically therewith.

The righthand end of the drive shaft 20, as

viewed in Fig. 1, is provided with a pair of axially spaced eccentrics 28 on each of which is mounted the big end of a connecting rod 28. The small or upper end of each connecting rod 28 is connected by means of a piston pin 29 to a piston 30 received in the corresponding cylinder H. The bores of the cylinders 12 open upon the top face of the casing 1'0 and are closed by a. conventional valve plate-32 and cylinder head 34 fixed thereto in sealed relation as by means of bolts 36. The rlghthand or crankcase portion of the casing i0 is provided with an aperture therethrough which bottomof which a tube 48 projects in concentric relation with respect to the drive shaft 28 and centrally into the 'bore of the same where it is relatively closely but relatively rotatably received within a sleeve 88 which is threaded into the bore of the shaft 28 at the leftha'nd end of the latter. An oil slinger 52 fixed to the lefthand end of the rotor 24 is adapted to dip into a body of, oil in the lower portion of the casing I8 and cause such oil to be thrown about within the casing III. A portion of such oil finds its way into the trough 48wh'er'e it is fed by gravity through the tube 48 into the hollowinterior of the drive shaft 28 where it is conducted to the wearing surfaces between the drive shaft 28 and its bearing i8 and the wearing surfaces between the eccentrics the casing I8 is of open.

The yoke members 14 are disposed on diametri-' their opposite free ends pivotally mounted on the opposite pins I2, the yoke members I4 being ofis'et fromone another axially'of the pins I2 as brought out in Fig. 8 by a distance substantially equal to the thickness of the material from which the yoke members 14 are formed, so that the yoke members may be identical to. each other.

cally-opposite sides of the tube 48 and, as indicated by dotted lines in Fig. 3, the portion connecting the legs of each member I4 is bowed outwardly for clearance purpo es as will hereinafter be more fully appreciated.

Each yoke member I4 midway between its sides is provided with-an arm 18, shown formed integrally therewith and projecting upwardly and to the right, as viewed in Figs. 1 and 2, in

28 and the connecting rods 28. and is conducted through the connecting rods 28 to the piston pins 28 and the bores of the cylinders I2.

The motor, comprising the field structure 22 and the rotor 24, may be of a synchronous of other type of electric motor having a conventional form of starting winding, a portion of motor reaches a predetermined speed, at which time the starting winding is de-energized as it is then not required. The present invention has particular relation to'means for controlling the energization and de-energizing of the starting winding.

To control the energizing and de-energizing of the starting winding a suitable or conventional type of electric switch indicated generally at 82 is mounted in fixed relation on the outer face of the cover 42 by means of a bracket 64 secured in place by one or more screws 88. The particular switch shown by way of illustration has an axially movable operating button or plunger 88 which is spring pressed toward projected position in which position the switch 82 is open and which, when in depressed position, the switch 82 is closed. Any suitable or conventional centrifugally operated mechanism responsive to the speed of the drive shaft and driven therefrom may be employed for the pur-- poses of the present invention and connected to the switch 62, or its equivalent, in accordance with the present invention. The particular centrifugally operated mechanism shown is therefore shown in an illustrative, and not in a limiting sense.

The particular centrifugally operated mechanism shown is mounted on a head 5| integral with the outer end of the sleeve 68. The head BI. as brought out in Fig. 2, is provided with a pair of diametrically opposed, axially outwardly projecting lugs I8 to each of which is secured a radially outwardly extending pivot pin 12. A pair of U or yoke-shaped members 14 have perpendicular relationship with respect to the length of the side portions of the yoke 14. The free end of each arm I8 is laterally projected to provide hook-like extensions I8, and a coil tension spring 88 is tensioned between the hooklike extensions 18 of both yoke members I4 on the corresponding sides of the tube 48, the springs 88 thus tending to cause the yoke members I4 to pivot toward one another about the pivot pins I2.- Additionally, each arm of each yoke member 14 intermediate its opposite ends is provided with an integral outwardly'struck portion 82 which portions of both yoke members on the corresponding sides of the tube 48 project toward one another and are arranged for contacting relationship with respect to each other when the yoke members 14 are drawn towards each other under the influence of the springs 88. In this connection it will be understoodthat the relation of the'parts shown in Figs. 1 and 2 are those which they assume in operation and with the starting circuit cut out.

Mounted on the tube 48 between the head 5| of the sleeve 58 and the inner end of the trough 48 is a sleeve 88 held against substantial axial movement by means of a flexible washer 88 and a resilient gasket 98 interposed between it and the opposed wall of the trough 46. Rotatably and axially slideably mounted upon the exterior of the sleeve 88 is a cone member 92 provided with an outwardly facing frusto-conical face concentric to the axis of the tube 48 and the shaft 28 and it is adapted to be moved axially outwardly on the sleeve 86 by the yoke member I4 moving under the influence of the springs 98 when the motor is de-energized. The cone member 92 has a hub 9-8 which is provided with a relatively deep circumferentially extending groove 98 within which the springs 88 are received. The reception of the springs 88 in the groove 98 serves as a connection between the yoke members 14 and the cone member 82 acting towlthdraw the cone member 92 axially inwardly when the yoke members swing away from each other when the motor attains a predetermined speed, and serving to pro- Ject the cone member 92 axially outwardly when the yoke members are drawn together by the springs 88 when the motor isde-energ'zed.

In order to utilize the axial movement of the cone member 92 to control the switch 62 the following mechanism is provided in accordance with the present invention. A member I88 is pivotally mounted between its ends on a pin I82 fixed with respect to the motor compressor housing for movement in-a plane radial to the axis of the shaft I28. It'wlll be understood that the member I88, although shown as and described herein as a pin, may assume any desired form or shape. The pin I80 projects through the end wall of the motor-compressor housing in approximately parallel relation with respect to the axis of the shaft 20, and radially ofl'set therefrom. In the particular case shown the pin I I positioned to be engaged by the frusto-conical surface of the cone member 02 when the latter is moved to its axially outer position under the influence of the springs 00 when the motor is at rest.,

The axially outer end of the pin I00 lies in engagement with the push-button 03 of the switch 82, and when the, cone member 32 moves to the last-described position, indicated in dotted lines. it causes the pin I00 to pi ot about its pivot pin I02 and force the plunger 08 inwardly to move the switch 82 to closed circuit position. When the electric motor is energized the springs 80 maintain the yoke members I4 in their contracted position until the motor approaches a predetermined speed at which time the centrifugal force acting upon the yoke members I4 is suflicient to cause them to pivot outwardly about their pivot pins I2, and in so doing act through the springs 80 to withdraw the cone member 92 from contacting relationship with respect to the pin I 00. Under the last-mentioned condition the force of spring within the switch 62 which tends to force the plunger 68 outwardly acts upon the pin I00 to return the pin to its normal running position shown in full lines and in which his free of contact with the cone member 92. At the same time the switch 82 is moved to open circuit position which breaks the circuit through the starting winding 60. Each'time the motor is de-energized, the springs 80 will draw yoke members I4 toward each other and thus force the cone member 92 axially outwardly during which time it will engage the inner end of the pin I00 and pivot the pin I00 in a direction to close the circuit through the starting winding through the switch 82 so as to condition the pin I30 as at I24. Thus the bellowsl l8 effectively seals the opening II4 through which the pin I00 protects and, being very flexible. it offers no substantlal resistance to pivotal movement of the pin I00 about its pivot pin I02.

The same type of seal as illustrated in Fig. 4 may be applied to a type of housing construction wherein a plug member such as the plug member I08 is welded, instead of being bolted, to the motor housing. In Fig. 5 the housing corresponding to the housing I0 previously described is illustrated at I and as being provided with an opening I3I therein for reception of the pilot portion I32 of the mounting member I34. The mounting memmotor to again start as soon as the control switch for the unit is closed. This construction thus provides means whereby a centrifugal device which operates closely to a given motor speed is employed for controlling the circuit to the st rting windings of a sealed motor, through a switch located exteriorly of the motor sealing means.

The construction above described for cutting in and out the starting windings for the electric motor being associated with a sealed motor-compressor unit it is, of course, necessary to seal the pin I00 to the motor housing, and the preferred method of effecting this seal is best brought out in Fig 4. As there ilustratcd the pin I00 proiects through the opening H4 in the plug I00 which opening is counterbored on either side of the pivot pin I02 to provide clearance for movemerit oi' the nin' I00 about such pivot r-in. A metallic bellows H6 surrounds the pin I00 inwardly of the plug I06 and is provided with a collar extension H8 at its outer end which is received in the corresponding counterbore of the opening II4 so as to center it with respect therebr I34 is provided with an axial opening therethrough for reception of the pin I 00a corresponding to the pin I00. In this case the pin I00a is pivotally mounted by means of pivot pin I02a, corresponding to the pivot pin I02 previously described. The collar or mounting member I34 is welded, brazed, soldered or the like as at I36 to the outer face of the housing I 30 and thereby sealed thereto. In this case the bellows IIBa corresponding to the bellows previously described has its axially outer end sealed to the inner end-of the pilot portion I32 by soldering, brazing or the like and its axially inner end sealed to the pin Him in a similar manner. It will be appreciated that the construction illustrated in Fig. 5 will function in a substantially identical manner to that illustrated in Fig. 4.

In Fig. 6 a construction is shown which employs pin instead of a metallic bellows. In this case the member I08b may be considered as being equivalent to the member I06 previously described and adapted to be secured to the cover member 42 in a similar or mechanically equivalent manner. It is centrally provided with a centrally apertured axial boss or extension I30 through which the pin IIJIlb, corresponding to the pin I00 previously described, projects and in which it is pivoted by means of the pin I02b preferably substantially in the plane of the inner face of the member I05b as shown. A circular diaphragm having a circularly corrugated body portion I40 lying substantially in the plane of the inner face of the member IBM) is sealed at its radially outer margin to the member I08b by soldering, welding, brr zing or the like and its central portion is provided with an axially offset portion I42 which first extends axially to clear the boss I38, and then radially inwardly to the pin I0|Ib to which it is suitably sealed as by soldering, brazing or the like, Preferably the axially inner face of the member I08b radially inwardly of the periphery of the body I40 of the diaphragm and radially outwardly of the boss I 38 is axially relieved as at I44 to provide operating clearance for the corrugated body portion I40 of the diaphragm. It will be appreciated that the construction illustrated in Fig. 6 will provide an effective seal and at the same time will be sufficiently flexible to permit the necessary pivotal movement of the shaft I00b to operate the cooperating switch controlling the starting winding of the motor.

In Fig. 7 a modified form of seal for the switch operating pin I000, corresponding to the pin I00 first described, is shown. In this case the mounting member I080 is substantially identical to the mounting member I051: of Fig. 6 except that it is not relieved as the mounting member IOGb is reaseaeo'v lieved t I, but otherwise it is identical and the pin I0 0 is similarly mounted thereon by means of the pivot pin I02c. In thiscase in order to provide a seal between the pin i000 and the member I00c a flexible rubber member I00 is provided in surrounding relationship with respect to the pin I000 and the central boss I000 and is suitably sealed to both thereof as by vulcanizing, bysuitable adhesive. or the like. The member I00 may be of any suitable rubber or rubber-like composition impervious to air and to the refrigerant being employed and, of course, to the eflects of lubricating oil which may find its way into contact therewith from the interior of the motor-compressor unit.

In Fig. 8 the application of the presentinvention to a different type of sealed motor-compressor unit is shown, and In this connection it will be understood that any of the forms of seals and 'pin mountings heretofore shown and described herein may be applied to this diflerentform of unit if desired. In the construction shown inFig. 8 the motor-compressor unit is contained within a cylindrical housing, I00 arranged with its axis vertical and adapted to be supported by means of legs I02. The housing I00 in this case may be of the type which is made in two halves each of cuplike conformation and their meeting edges brought together and welded to form a single onepfece construction. The motor field assembly I00 is mounted in the housing I00 in any suitable or conventional manner and the rotor I00 is fixed to the vertically directed shaft I08 suitably mounted within the housing I00 and the lower end of which is suitably connected to a conventional type of compressor (not shown) which it is adapted to drive. The upper end ofthe shaft I 08 carries a member I00 which is the full equiva-s lent of the head portion 0i of the sleeve member 00 described in connection with Fig. 1, and upon it and slidably mounted upon the upper end of the shaft I08 and is provided with a hub having a groove I08 therein corresponding to the groove tion. I The member I10 has a pilot portion I12 which generally fits an opening provided in the housing I00 for the reception of the same and the member I10 is brazed or soldered to the housinl I00 as at I10 to seal and secure it thereto.

In this last-described construction the pilot pinsproject perpendicularly therethrough centrally of the corresponding faces I10 and through the corresponding side wall of the pilot portion I12. The pins I00 are axially aligned with each other and preferably disposed with their axes in diametric relation with respect to both the pilot portion I12 and the pin I00d.

The base of the strap member I10 is positioned inwardly of the inner end of the pilot portion I12 and the pin I00d projects centrally through it and is secured thereto. In the particular case shown, the pin I00d is made in two parts connected through the base of the strap member I10, this being a convenient way of securing the pin to the strap member. It will be appreciated that in fixing the pin I00d to the strap member I10 the pin is mounted for pivotal movement about the axes of the pins I00. This construction thus permits a sealing bellows I02, corresponding to the bellows 08 in the first-described construction, the groove I08 is adapted to receive the springs 00 therein thereby to control the axial position of the member I02 in accordance with the pivotal position of the yoke members 10 in the same general manner as the cone member 02 is controlled thereby in the first-described construction. In this case, however, the pin member I 00d instead of project- IIS and to of Figs. ,4 and 5, respectively, to be employed but in this case extending in both directions axially of the pivotal axis for the pin I00d. In other words, the bellows I02 surrounds the pin I00d within the member I10 and its pilot extension I12, its outer end being sealed, as by soldering or the like. to the outer end of the member I10, and its inner end being sealed, as by soldering of -the like. to the pin I00d at the base of the strap I18. Preferably the inner end of the strap I18 is soldered or the like to the bellows I82 and both parts of the pin I00d so as to flx all of these parts together.

It will be noted, as best brought out in Fig. 9, that in this last-described construction pivotal movement of the pin I00d about the axis of the pins I00 to control the switch 02d is accompanied by bending of the sealing bellows I02 about an axis between its ends.' It also permits a longer bellows than in the first-described constructions to be used. As a result the stresses on the bellows I82 during pivotal movement or the pin I00d are very low and the resistance of the bellows I02 to pivotal movement of the pin I00d is negligible.

In a. manner similar to the construction firstdescribed. in the construction shown in Fig. 8

ing through the housing I00 in parallel relation with respect to the axis of the shaft I08 extends in radial relation with respect to the axis of the shaft I08 with its inner end overlying the upper face of the member I02 and particularly the flange I00 thereof. It is provided on its lower face with a button I00 for engagement with the flange I00. The pin I00d projects out through the casing I00 through a collar member I10 in which it is permitted the necessary movement to operate the button 68d of the cooperating switch 6211 which maybe identical to the switch 02 of the first-described construction and connected to the starting windings in the field structure I 00 in the same when the motor is tie-energized the springs 00 draw the yoke arms 10 together and lift the member I62 on the shaft I00, the flange I00 striking the button I00 and causing the pin I00d to pivot upwardly toward the position illustrated by dotted 7 lines, thus causing the outer end of the pin I00d to be depressed and in being depressed It moves the button 084 of the switch 62d downwardly to close the circuit through the switch 02d which is in series with the starting windings for the electric motor described. Thus the construction illustrated in Fig. 8 operates in substantially the same manner as the construction first-described.

Having thus described my invention, what I claim by Letters Patent is:

i. In a motor-compressor unit of the class wherein a motor and a compressor are sealed within a housing and are provided with a common operating shaft, the motor being of a type provided with a starting winding, the combination with said motor of centrifugally actuated mechanism driven thereby including a member movable axially of said shaft, a switch mounted upon the outside of said housing and connected in the series with said starting winding, a member projecting through an opening in a wall of said hous ing and mounted for pivotal movement about an axis extending transversely thereof, the outer end of the second-mentioned member lying-in operative relation with respect to said switch and the inner end of said second-mentioned member lying in cooperative relationship with respect to said axially movable member, and means sealed to said housing and to said second-mentioned member sealing said opening against the flow of fluid therethrough between the interior and exterior of said housing, the relationship ofsaid parts being such that when said centrifugally actuated mechanism is inactive said switch is in closed position and when said centrifugally actuated mechanism is active and said motor reaches a predetermined speed, said switch is open,

2. In a motor compressor of the class wherein a motor and a compressor are mounted within a gas-tight housing and are provided with a common operating shaft, and the motor is an electric motor provided with a starting winding, the combination with said shaft of centrifugally actuated mechanism driven thereby within the said housing and including a member adapted to be moved axially of said shaft thereby, an electric switch mounted on the exterior of said housing and connected in series with said starting winding, a pin mounted for pivotal movement on said housing projecting through an opening in said housing and operative'y connecting said switch and .said member for simultaneous movement in at least one direction of movement of each thereof, and a flexible impervious member sealed to both said pin and to said housing thereby to provide a fluid seal for said opening.

3. A sealed motor-compressor unit of the class wherein an electric motor having a starting winding, and a compressor, are provided with a common housing and a common operating shaft and said housing seals said motor and compressor from the atmosphere exterior to said housing, the combination with said shaft of centrifugally ac- 10 wherein an electric motor having a starting winding, and a compressor, are provided with a common housing and a common operating shaft and said housing seals said motor and compressor from the atmosphere exterior to said housing,

the combination with said shaft 01' centrifugally actuated mechanism driven thereby within said housing, said mechanism including a member movable thereby axially of said shaft within said housing, said housing having an opening therethrough, a pin projecting through said opening, and pivoted intermediate its ends with respect to said housing for movement in said opening about a line transverse to the length of said pin, a flexible metallic member surrounding said pin and having its opposite ends sealed to said pin and with respect to said housing, respectively, sealing the interior of said housing against communication with the atmosphere through said opening, the inner end of said pin extending into operative relationship with respect to said member whereby said pin is adapted to be pivoted about its pivotal axis upon movement of said member axially of said shaft in one direction under the influence of said centrifugally actuated mechanism, and a switch mounted on the exterior of said housing and operatively connected with the Outer end of said pin, said switch being connected in series with said starting winding of said motor.

5. A sealed motor-compressor unit of the class wherein an electric motor having a starting winding, and a compressor, are provided with a common housing and a common operating shaft and said housing seals said motor and compressor from the atmosphere exterior to said housing, the combination with said shaft of centrifugally actuated mechanism driven thereby within said housing, said mechanism including a member movable thereby axially of said shaft within said housing, said housing having an opening therethrough, a pin projecting through said opening and pivoted intermediate itsends with respect to said housing for movement in said opening tuated mechanism driven thereby within said and pivoted intermediate its ends about an axis fixed with respect to said housing for movement in said opening about a line transverse to the length of said pin, flexible means sealed to said pin and with respect to saidhousing sealing the interior of said housing against communication with the atmosphere through said opening, the inner end of said pin extending into operative relationship with respect to said member whereby said pin is adapted to be pivoted about its pivotal axis upon movement of said member axially of said shaft in one direction under the influence of said centrifugally actuated mechanism, and a switch mounted on the exterior of said housing and operatively connected with the outer end of said pin, said switch being connected in series with said starting winding of said motor.

4. A sealed motor-compressor unit of the class about a line transverse to the length of said pin, a flexible metallicbellows surrounding said pin within said housing and having one end thereof sealed with respect to said housing and the opposite end thereof sealed to said pin and sealing the interior of said housing against communication with the atmosphere through said opening, the inner end oi said pin extending into operative relationship with respect to said member whereby said pin is adapted to be pivoted about its pivotal axis upon movement of said member axially of said shaft in one direction under the influence of said centrifugally actuated mechanism, and a switch mounted on the exterior of said housing and operatively connected with the outer end of said pin, said switch being connected in series with said starting winding of said motor.

6. A sealed motor-compressor unit of the class wherein an electric motor having a starting winding, and a compressor, are provided with a common housing and a common operating shaft and said housing seals said motor and compressor from the atmosphere exterior to said housing, the combination with said shaft of centrifugally actuated mechanism driven thereby within said housing, said mechanism including a member movable thereby axially of said shaft within said housing, said housing having an opening therethrough, a pin projecting through said opening and pivoted intermediate its ends with respect to said housing for movement in said opening about a line transverse to the length of said pin.

. aesasor a flexible diaphragm having a central opening therethrouglrthrough which said pin projects and being otherwise imperforate. said flexible diaphragm being sealed with respect to said housing at itsouter periphery and sealed to said pin at its inner periphery with the plane of its body substantially including the pivotal axis of said, pin and sealing the interior of 4 said housing against communication with the atmosphere through said 0 extending int operative relationship with re-' spect to said member whereby said pinis adopted to be pivoted about its pivotal axis upon movement of said memberlaxially of said shaft 'in one direction under the influence of said centrifugally actuated mechanism. and a switch mounted on the exterior of said housing and operatively connected with the outer end of said pin, said switch being connected in series with said starting wind,

ing of said motor.

"I. A sealed motor-compressoramit of the class wherein an electric motor having a starting winding. and a compressor, are provided with a common housing and -a common operating shaft and said housing seals said motor and compressor from the atmosphere exterior to said housing. the combination with said shaft of centrifugally actuated mechanism driven thereby within said housing, said mechanism including a member movable thereby axially ofsaid shaft within said housing, said housing having an opening therethrough, a pin projecting through said opening in approximate parallel relation with respect to theaxis of said shaft and pivoted intermediate its ends with respect to said housing for movement in said opening-about a line transverse to the lengthoi' said pin,- flexible means sealed to said pin and tosaid housing seallngthe interior of said housing against communication 12 outer end of said pin. said switch being connected in series with said starting winding of said motor.

8. A sealed motor-compressor unit of the class wherein an electric motor having a starting winding, and a compressor, are provided with a common housing and a common operating shaft r and said housing seals said motor and compressor mg. .the inner end of said Din from the atmosphere exterior to. said housing. the combination with said shaft of centrifugally actuated mechanism driven thereby within said housing, said mechanism including a member movable thereby axially of said shaft within said housing, said housing having an opening therethrough, a pin-proiecting through said opening in approximately radial relation with respect to the axis of sai shaft and pivoted intermediate its ends with r p'ect to said housing for-movem with the outer end 01 said pin, said switch being with :the atmosphere through said opening. the

inner end of said .pin extending into operative relationship with respect to saidmember'whe'reby said pin .is adapted to be. pivoted: about its pivotal axis vupon movement! said member axially of said shaft in one direction under the influence of said centrifugally actuated mechanism, and a switch mounted on the exterior oi said housing and operatively connected with the ment in said opening about a line transverse to the length of said-pin. flexible means sealed to said pin and with respect to said housing sealing the interior of said housing against communication with the atmosphere through said opening'. the inner end of said pin extending into operative relationship with respect to said member whereby said pin is adapted to be pivoted about its pivotal axis; upon movement of said member axially of said shaft in one direction under the influence of said centrifugally actuated mechanism, and a switch mounted on the ex terior of said housing and operativeiy connected connected in series with said starting winding of said motor.

1 HARRY Er THOMPSON:

REFERENCES crrnn The following references are of record in the file of this patent:

I UNITED STATES PATENTS Number v Cody Feb. 24, 1942

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