US2711146A - Cooling means for sewing machines - Google Patents

Description

June 21, 1955 A. c. PETERSON EI'AL 2,711,146

COOLING MEANS FOR SEWING MACHINES 4 Sheets-Sheet 1 Original Filed Aug. 2, 1950 FIG. I

&

INVENTORS. ALBERT C. PETERSON JOHN G. ATTWOOD ATTORNEY June 21, 1955 A. c. PETERSON ETAL 2,711,146

coouuc MEANS FOR SEWING MACHINES Original Filed Aug. 2. 1950 v 4 sheets-sheet 2 FIG. 2

86 I05 Q "i v INVENTORS.

92 ALBERT C. PETERSON BY JOHN G. ATTWOOD ATTORNEY.

June 21, 1955 A. c. PETERSON ETAL 2,711,146

COOLING MEANS FOR SEWING MACg-IINES Original Filed Aug. '2. 1950 4 Sheets-Sheet 3 FIG. 3

INVENTORS. 4 ALBERT c. PETERSON BY JOHN G. ATTWOOD as v . ATTORNEY.

June 21, 1955 ,A. c. PETERSON ETAL I 2,711,146

COOLING MEANS FOR SEWING MACHINES Original Filed Aug. 2. 1950 4 Sheets-Sheet 4 minim] E PETER JOHN G. ATTWO BY ATTORNEY.

United States Parent 0 COOLING MEANS FOR SEWING MACHINES Albert C. Peterson, Park Ridge and John G. Attwood, Oak Park, 11]., assignors to Union Special Machine Company, Chicago, Ill., a corporation of Illinois Original application August 2, 1950, Serial No. 177,154,

now Patent No. 2,684,652, dated July 27, 1954. Divided and this application December 13, 1952, Serial No. 325,856

6 Claims. c1. 112 -218 This invention relates to industrial sewing machines I.-

continuous and safe operation of the machines at high speeds.

More particularly, the invention relates to machines of the overedge seaming type and especially-to machines of this character whichare not equipped with completely closed lubricant tight housings. This application is a division of our pending application, Serial No. 177,154, filed on August 2, 1950, now Patent No. 2,684,652, granted July 27, 1954. I

As set forth in said parent application, the invention involves a novel arrangement for insuring adequate but not excessive lubrication of the principal operating parts of the machine. The arrangement is such that leakage or spattering' of the lubricant which would result in soilingv the work or the clothing of the operator and would require frequentreplacementof the lubricant is heldto a minimum. p

In conjunction with the improved lubrication features it has been an important object of the invention to provide simple but effective means for removing heat from the operating parts thereby minimizing deterioration of the lubricant and'enabling long continuous operation of the machine at high speeds. Toward the foregoing end the invention involves the provision ofheat dissipating means comprising an arrangement for rapid transfer of heat from the operating parts to the atmosphere within the machine frame and the continuous-removal of the heated air from within the frame. Such means are arranged to perform their functions, moreover, in such a way that leakage or loss of the lubricant which is being continuously circulated, is held to a minimum.-

Other objects, features, and advantages will appear from the detailed description of an illustrative form of the invention which will now be givenin conjunction with the accompanying drawings in which:

Fig. 1 is a view, partly in front elevation and partly in vertical section, showing an overedgerwith a lubricant reservoir pan mounted in a table top;

Fig. 2 is a sideelevational view-of the machine and reservoir pan mounted in a table top which is shown in cross-section, the machine and pan being mounted in a different relation to the table top than in Fig. 1;.

Fig. 3 is-a view partly in elevation and-partly inlongitudinal section through the machinqreservoir pan, and supporting table top, the parts beingin the same relation as in-Fig;. 2;

Fig; 4 is a detailview, in elevation, of aspecial lubricant delivery element, a number of which are embodied in the machine;

Fig.5 is a detail view,in'perspective showing. a guard or deflector provided in the machine; 4 J v 6 is an outer face view of a combined handwheel and pulley mounted on themairi' shaft of the machine;

the parts in properly assembled relation.

, 2,711,146 Patented June 2 1, 19,55

Fig. 7 is an axial sectional view through the handwheel and pulley;

Fig. 8 is an elevational view showing the inner face of the handwheel and pulley; and

Fig. 9 is a detail view showing in elevation a portion of the frame of the machine in the region of the main shaft, the latter being shown in section. Referring now to the drawings, the invention has been illustrated as applied to an overedge sewing machine of the general type disclosed in the patents to Christensen et al. No. 1,751,508, granted March 25, 1930; Zeier No. 1,864,391, granted June 21, 1932; Rubel ,No; 2,494,901, granted January 17, 1950; and Sauer No. 2,502,346, granted March 28, 1950. It will be understood, however, that the invention is not limited for use in connection with this specific type of machine.

In Figs. 1, 2 and 3 there is shown, in section; the top 10 of a sewing table of any suitable construction. On this is mounted a lubricant reservoir panll which serves to carry the sewing machinedesignated generally at 12. The relationship between the table top and the sewing machine with its connected reservoir pan may be either as indicated in Fig. 1 or as indicated in Figs. 2 and 3 In the latter arrangement a horizontally extending flange lie at the top of the reservoir pan .is disposed above the top of the table and is supported by a plurality (preferably 4) of vibration isolating members. These may suitably be similar to those shown in the patent to Thompson No. 1,948,193, granted February 20, 1934. Each may comprise a central pin or stud 13' having an enlarged lower head portion 13a pressed into and surrounded by acylindrical vibration absorbing element 15 formed of cork or felt or the like; The lower and' upper ends of element 15 are enclosed and retained by a pair of cuplike members 14 and 16. Pin 13 extends through an opening in the member 16 from which it projects a suitable distance to cooperate Withan opening 11b (Fig; 7) provided in the flange 11a of the reservoir pan. The pin 13 may be secured in any suitable way to the flange, as by a relatively tight fit or by screw threads or by a knurled or ribbed formation or the like. 7 The vibration absorbing units are adapted to fit snugly into suitable recesses provided in the upper surface of the top 1'0 of the table. An opening 10a (Figs. 2 and 3) is provided through the table top to receive the main body of the reservoir pan, this opening being of suitable size to provide the necessary clearance.

In Fig. 1 there is shown an alternative arrangement of the sewing machine and reservoir pan in relation to the table top. This may be employed when it is desired to have the work supporting surface of the sewingmachine closer to the top of the table. The reservoir pan 1'1 in'this arrangement is disposed completely below the tabletop; It is suspended in' this position by means of bolts 13b '4 cooperating with the holes '11b in the flange llaiof the reservoir pan. Nuts 13d above and below the flangc'lla serve to retain the pan in any desired position along the bolts. To absorb vibration each of the bolts 13])" is Sui"- rounded by an element lfia'formed of cork-oi compressed I felt or other suitable vibration absorbing materialretained by cup- like elements 14a and 16a; The; upper eiid of each bolt 13b is provided with an enlarged been 130' C6- operating with the'upper face of thecup 16a to m airitiiiii When this arrangement of the parts isemployed the table is no't only provided with suitable recesses or pockets to receiveithe vibration absorbing members, but the hottoms'of these recesses are provided with openings through which the bolts 13b may'extenddownwardly. The tabletop is also provided with a somewhat larger opening 141b than is provided fo r'the arrangements of Figs. 2 and 3 topermit the free passage of the base 17 of the sewing machine through this opening.

In either of the arrangements described above, the base 17 of the sewing machine is secured to the flange 11a of the reservoir pan. For this purpose the base of the machine frame is provided with a plurality of laterally extending foot portions provided with suitable openings aligned with threaded openings in the flange of the reservoir pan. Screws 22 (Fig. 2) or 22a (Fig. l) countersunk in the openings in the foot portions of the sewing machine frame and threaded into the tapped holes in the pan serve to secure the parts in the manner shown.

In upwardly extending portions 17a and 17b of the frame of the sewing machine, a main operating shaft 23 is journaled. Bearing sleeves or bushings 24 and 25 having a pressfit in suitable openings in the frame serve to support the shaft with its axis inclined somewhat to the horizontal to facilitate operation of the reciprocating needle in the manner to be explained. At its left end (Fig. 3) the shaft extends outwardly from the frame and carries a combined handwheel and pulley 26 adapted to receive power for operating the machine by means of a V-belt 27 connected, in a manner well understood, with a power driving unit preferably carried by the table beneath the top 10. This belt passes through an opening 27a (Fig. 3) provided in the laterally extending flange of the reservoir pan. It also passes downwardly through the opening 10a 01' 10b in the table top. At the opposite end of the shaft 23 there is carried a crank arm 28 which, through a pivotally connected link 29, serves to reciprocate a needle bar 30 mounted in a bearing sleeve 31 carried by the frame of the machine. Needle bar 34) is disposed at a small acute angle to the vertical, its axis being perpendicular to that of the shaft 23. A needle 32 carried by the needle bar is thus caused to reciprocate along a line best suited for the production of an overedge stitch in conjunction with the complementary stitch forming devices. The latter include an under looper 33 carried by an arm 34 arranged for oscillation, in a manner well known in the art, and also include an overedge looper or spreader 35 carried by an arm 36 arranged to impart suitable oscillatory movements to the overedge element. The particular form and arrangement and mode of operation of the stitch forming devices constitute no part of the present invention. These may, if desired, be constructed in accordance with the above mentioned patent to Zeier No. 1,864,391, or they may, if desired, be formed and arranged in accordance with the patent to Rubel No. 2,494,901. Suffice it to say that the loopers or looper and spreader may be operated by a plurality of eccentrics 37 and 38 (Fig. 3) carried by the shaft 23. These eccentrics are of the spherical type and cooperate with straps at the upper ends of pitmans 39 and 46 which are, in turn, connected through suitable mechanism with the looper carriers.

For advancing the work in the course of stitch formation, a feed dog of conventional form may be employed. The shank 41 of such a feed dog is indicated in Fig. 3, this being secured to a reciprocating bar 42 connected by a link 43 with an arm 44 of a feed rocker carried by a shaft 45. Suitable connections are provided from the main shaft for oscillating the feed rocker, these connections including a pitman 46 having a strap at its upper end (:0- operating with a spherical eccentric 47 on the main shaft. Lifting and lowering movements are imparted to the feed dog by a link 48 connected at its lower end in a suitable manner with the feed bar supporting means and at its upper end with a pin 49 connected by a pitmanSi) with a spherical eccentric 51 on the main shaft. Pin 49 extends outwardly from an arm 52 pivotally mounted at 53 on the frame, this arm carrying at its outer end a trimmer blade 54. The latter cooperates with a stationary trimmer blade 55 (Figs. 1 and 2) suitably mounted below the work supporting surface of the machine.

Cooperating with the feed dog in advancing the work 4 p 7 is a presser foot 56 (Figs. 1 and '2) carried by the forward end of an arm 57 carried by a rockably mounted shaft journaled in the frame. As will be understood the arm 57 is normally spring urged to yieldingly press the presser foot against the work. Whenever desired, it may be lifted from the work by means of an arm 58 (Figs. 2 and 3) secured to the rock shaft carrying the arm 57. A chain 59 or other suitable connection from the arm 58 may be I attached at its other end to a foot treadleor knee operated member for lifting the presser foot when desired.

The improved lubrication system of the machine, in-

volves a main lubricant reservoir 60 at the top of the frame. from the main frame and is secured to the two upstanding portions 17a and 17b of the frame by means of a plurality of screws 61 and 62 (Fig. 3).

and convey lubricant by capillary action. of the strip is interposed between the top of the main frame extension 17a and an outwardly extending flange at the bottom of the reservoir casting. Similarly, the

right end of the strip is interposed between the upper reservoir, above the level 65, for the introduction of lubricant.

For delivering lubricant from the reservoir to the various eccentrics on the main shaft 23 there is provided a series of wick filled tubes 72 (Figs. 3 and 4) extending through the bottom wall of the reservoir and projecting downwardly a suitable distance therefrom; Wicking 73 carried by the tubes extends into the reser.

voir to receive lubricant and conduct it by capillary action to the lower ends of the tubes. At the lowerfend of each tube there is provided a small loop of wire. 74

having its free end soldered or brazed or otherwise secured to the outer surface of the tube 72 adjacent its lower end. These loops 74 are preferably formed of copper or brass or other metal which may be readily bent and remain set in any desired shape.

As shown in Fig. 3, they may serve to deliver the lubricant directly to the side surfaces of the severaleccentrics 37, 38, 47 and 51. The relatively thin character of the wire and the flat form of the loops enables the latter to fit between closely spacedrparts for the delivery of the lubricant to precise points. In lieu of the wire loops 74, each of the tubes 72 may, if desired,

be provided with similarly shaped elements formed of thin sheet material adapted to be readily bent and re-.

main set in the manner explained. Also a single wire, not looped, may be attached to the lower end of a tube 72 at only one side and bent in the same manner.

While the wick filled tubes '72 are arranged to deliver I a relatively small, regulated amount of lubricant to the eccentrics a certain excess beyond the actual lubrication requirements of the eccentrics will be supplied..

This excess is thrown by centrifugal force from theeccentrics and a portion is deposited upon the under surface of the strip 63. By capillary action the lubricant so received will be delivered to the opposite ends of the strip. The portion delivered toward the left (Fig. 3) will be supplied to wicking 75 extending from the un der surface of the strip 63 to the, surface of the journaled portion of the shaft 23 within the bearing sleeve 24. The frame and bearing sleeve will, of course, be provided with aligned openings for this purpose. 'Wick- This reservoir is formed as a casting separate,

Along the .un-' der surface of the reservoir there is provided a flat strip es of felt or other suitable material adapted to collect The left end.

This enables the lower ends of the loops to be located closely; adjacent to the point where the lubricant is desired. 7

ing 76 may be provided on the under side of the journaled portion of the shaft and held in engagement with the latter by a spring 77 to insure the maintenance of an adequate supply of lubricant at the hearing. In a similar manner the right end of the strip 63 serves to deliver lubricant to the upper end of wicking 78 provided in a vertical passage in the frame communicating with the bearing sleeve 25 and extending through the latter to the surface of the journaled portion of shaft 23. At an intermediate point the passage containing the wicking 78 communicates with a laterally extending tube 79 which carries suitable wicking for conducting a small part of the lubricant from the wicking 78 to one or more of the points requiring lubrication in the needle bar reciprocating mechanism, such as the pivotal connection between the crank 28 and link 29. Beneath the journaled portion of the shaft 23 wicking St) is provided to maintain an adequate supply of lubricant at the bearing. Excess lubricant will be delivered to a passage 81 from which it is discharged by a tube 82 to parts beneath it, which may require lubrication, and some will be returned to the sump.

Turning now to the reservoir pan, this, as best shown in Fig. 3, is provided with a lubricant receiving space 83 above a large filter member 84. Any excess lubricant delivered to the various operating parts of the machine will be returned by gravity to the space 83. The filtering member 84 is preferably formed of a plurality of layers, the upper and lower of which are relatively coarse screens carrying between them a layer of felt or the like.

Beneath the filter member 84, a downwardly extending portion 86 of the reservoir pan provides a sump for the accumulation of the excess lubricant. In a thickened wall portion 87 of the sump there is mounted a cylindrical pump housing 88 having a radially extending flange 89 secured .by screws 90 or the like to the outer face of the wall 87. A suitable gasket is preferably provided between the fiange Y89 and the outer face of the wall. Within the member 88 there is journaled a shaft 91 which carries on its outer end a pulley 92. The latter is arranged to cooperate with the outer face of one branch of the belt 27 in its passage from the pulley of the power .drive (.not shown) to the pulley 26 of the sewing machine. carries a gear 93 which may, if desired, be formed integrally with the shaft. This gear meshes with another .gear :94 carried by a spindle 95 journaled in a suitable opening .in the member '88 parallel with the shaft 91. A disc 96 having a slightly greater thickness than the width of the gears 93 and 94 is provided with a cloverlike aperture at its center to partially surround the gears and provide intake and discharge ports. Outwardly of the disc 96 is a closure disc 97, which, together with the disc 96, is suitably secured to the housing 88 by 'a plurality of screws 98. An :opening extending through the disc 97 communicates with the intake side of the gear pump and serves .to 'deliver lubricant from the sump to the pump. A discharge passage is provided in the hous ing memberSS at the opposite .s'ide'of the gears 93 .and 94. This discharge passage, not shown herein but disclosed in said parent application, communicates with an upwardly extending passage 102 (Fig. 2 which receives a threaded nipple 103 forming part of a union serving to connect the lower end .of a conduit 104 with the reservoir pan. "This conduit at its upper end is con- .nected with the inlet opening .67 (Fig. 3) in the upper reservoir.

The reservoir pan is preferably provided with a spoutlike extension 109 (Fig. l) which projects outwardly and upwardly from one wall of the sump at an angle of about 45 A filling opening 110 (Fig. 3) is provided lengthwise of the spout and carries at its upper end a removable screw plug 110a (Fig. 2). On removal of the latter the lubricant in the sump may be replenished. An oil gauge,

At its inner end the shaft 91 :4

preferably in the form of a Lucite plug 111, similar to that disclosed in the patent to Sauer No. 2,301,460, granted November 10, 1942, extending from the outer end of the spout to the inner end thereof, may be provided to indicate the level of the lubricant-in the sump.

To prevent overheating of the machine duringhigh speed operations over long periods of time, special cooling means are provided. These include a disc 112 formed of a good heat conducting metal, such as copper or aluminum, secured in any suitable way to the shaft 23 intermediate the eccentrics 37 and 47. This disc serves to pick up heat from the shaft and its connected parts, by conduction, and the heat is then conveyed quickly to the periphery of the disc. The latter, by virtue of its rapid movement, serves to transfer theheat to the air within the housing. Continuous movement of the air within the housing and constant withdrawal of the heated air is effected by means of a fan 1-13 (Figs. 7 and 8) which is secured to the inner face of the ha'ndwheel and pulley 26 by means .of a plurality of screws 114. The fan comprises simply a thin disc having bent up portions 115 projecting from the face thereof and extending radially outwardly from points near the axis of the pulley member to the periphery thereof. The blades 115 provide a centrifugal blower action serving to discharge radially outwardly the air which is drawn in adjacent the inner ends of the blades. Such air is supplied through openings 116 (Fig. 9) provided through the upwardly extending portion 17a of the frame around and closely adjacent tothe bea-ring sleeve 24. It will be apparent that in this way the heated air is constantly withdrawn from the interior of the housing whenever the machine is in operation. Since the frame, as previously indicated, is not air-tight, air may enter the same freely at a number of points to replace the air withdrawn. The arrangement is such that a relatively large volume of air may be .drawn into and discharged from the interior of the frame without producing high velocity movement of theair. Accordingly, very little lubricant is entrained in the air that is withdrawn. To reduce further the tendency to entrain lubricant inthe air withdrawn from thehousing, a guard-memher 117 (Figs. 3 and 5:) is provided. This has a platelike portion 115 provided with openings119- adapted to receive the screws 61 and an opening 119a.throu gh which the wicking 75 may pass. The plate like portion 118 isinterposed between the top of the frame extension 17a and the under surface of the strip 63. A downwardly extending portion 120 of the guard member is slotted, as indicated at 121 (Fig. 5), to straddle the shaft 23. Pertion 120 extends over the inner ends of the openings 1-16 through the frame but is spaced slightly therefrom. The arrangement is such that lubricant mist cannot be discharged directly through the openings 116 but adequate space is provided for the movement of ,air around the edges of portion 120 .at a relatively low velocity to the inner ends of the openings 116. The major-portion of any'lubricant mist thatmay'be entrained in the air'will be deposited on the various interior surfaces, including those on the member 1-17, before the air reaches the fan. Such lubricant will then bereturned-to the sump.

From the foregoing it will be seen that-the present invention provides fully automatic means for lubricating the various relatively moving surfaces of the operating parts of an overedge sewing-machine of the character indicated. The lubricant is continuously recirculated, in the course of supplying adequate lubricant to the surfaces requiring the same, and through the provision of the 'fil- :ter ing means it -is insured that only clean'lubricant is so supplied. This-is in-spite of'the-accessibility of the lubricantto lint, filler-materials and other objectionable particles. As a consequence the machine is capable of continuous operation at higher speeds than heretofore, and this is made further possible by the provision of the cooling means.

While an illustrative embodiment of the invention has been described in considerable detail and various modifications have been suggested, it will be understood that numerous other changes may be made in the construction and arrangement of the various parts without departing from the general principles and scope of the invention.

What we claim is:

1. In a sewing machine having a frame carrying and substantially enclosing stitch forming and work feeding devices, a bearing mounted in a wall of said frame, a main operating shaft journaled in said bearing and projecting outwardly from said frame, connections for said shaft for operating said devices, and a pulley on said shaft exterior of said frame for driving the same, the combination of means for cooling the parts within said frame which comprises a heat conducting member mounted on said shaft for rotation therewith within said frame, said member being in heat conducting relation to said shaft and having large surfaces for transmitting heat therefrom to the air within said frame, and air suction means carried by said shaft exterior of said frame adjacent said pulley, said frame being provided with at least one opening adjacent said shaft for the passage of air from within said frame to said air suction means.

2. In a sewing machine having a frame carrying and substantially enclosing stitch forming and work feeding devices, means for creating a lubricant mist within said frame, a bearing mounted in a wall of said frame, a main operating shaft journaied in said bearing and projecting outwardly from said frame, connections from said shaft for operating said devices, and a pulley on said shaft exterior of said frame for driving the same, the combination of means for cooling the parts within said frame which comprises a heat conducting member mounted on said shaft for rotation therewith within said frame, said member being in heat conducting relation to said shaft and having large surfaces for transmitting heat therefrom to the air Within said frame, air suction means carried by said shaft exterior of said frame adjacent said pulley, said frame being provided with at least one opening adjacent said shaft for the passage of air from within said frame to said air suction means, and a shield adjacent the inner end of said bearing substantially surrounding said shaft and extending across the inner end of said opening but spaced slightly therefrom, said shield serving to prevent the discharge of lubricant through said opening but enabling the movement of air around the shield and outwardly through the opening.

3. In a sewing machine having a frame carrying and substantially enclosing stitch forming and work feeding devices, a bearing mounted in a wall of said frame, a main operating shaft journaled in said bearing and projecting outwardly from said frame, a plurality of eccentrics on said shaft for operating said devices, and a pulley on said shaft exterior of said frame for driving the same, the combination of means for cooling the parts within said frame which comprises a disc formed of a metal having high heat conductivity mounted on said shaft between two of said eccentrics for rotation therewith within said frame, said disk being in heat conducting relation to said shaft and having large surfaces for transmitting heat therefrom to the air within said frame, and air suction means carried by said shaft exterior of said frame adjacent said pulley, said frame being provided with at least one opening adjacent said shaft for the passage of air from within said frame to said air suction means.

4. In a sewing machine having a frame carrying and substantially enclosing stitch forming and work feeding devices, a bearing mounted in a wall of said frame, a main operating shaft journaled in said bearing and projecting outwardly from said frame, connections from said shaft for operating said devices, and a pulley on said shaft exterior of said frame for driving the same, the combina- 1 tion of means for cooling the parts within said frame which comprises a heat conducting member mounted on said shaft for rotation therewith within said frame,said member being in heat conducting relation to said shaft and having large surfaces for transmitting heat therefrom to the air within said frame, and air suction means carried by said pulley, said frame being provided with at least one opening adjacent said shaft for the passage of air from within said frame to said air suction means.

5. In a sewing machine having a frame carrying and substantially enclosing stich forming and work feeding devices, a'bearing mounted in a wall of said frame, a main operating shaft journaled in said bearing and projecting- V outwardly from said frame, connecti0ns from said shaft for operating said devices, means for supplying lubricant tosaid connections, a portion of the lubricant being thrown from said connections upon operation thereof, and a pulley on said shaft exterior of said frame for driv ing the same, the combination of means for cooling the parts within said frame which comprises a heat conducting member mounted on said shaft for rotation therewith within said frame, said member being in heat conducting relation to said shaft and having large surfaces for transmitting heat therefrom to the air within said frame, air

suction means carried by said shaft exterior of said frame adjacent said pulley, said frame being provided withat least one opening adjacent said shaft for the passage of air from within said frame to said air suction means, and a shield adjacent the inner end of said bearing substantially surrounding said shaft and extending across *the* inner end of said opening but spaced slightly therefrom, said shield serving to catch lubricant entrained in the air in its movement toward said opening and to prevent the discharge of lubricant through said opening but enabling the movement of air around the shield and outwardly through the opening.

6. In a sewing machine having a frame carrying and substantially enclosing stitch forming and work feeding devices, a bearingmounted in a wall of said frame, a main operating shaft journaled in said bearing and projecting outwardly from said frame, connections from said shaft for operating said devices, means for supplying lubricant to said connections, a portion of the lubricant being thrown from said connections upon operation thereof, and a pulley on said shaft exterior of said frame for driving the same, the combination'of means for cooling the parts within said frame which comprises a heat conducting.

member mounted on said shaft for rotation therewith within said frame, said member being in heat conducting relation to said shaft and having largesurfaces for transmitting heat therefrom to the air within said frame, air suction means carried by said shaft exterior of said frame adjacent said pulley, said frame being provided with at least one opening adjacent said shaft for the passage of air from within said frame to said air suction means, and,

means in the path of movement of air from within said frame to said opening for collecting lubricant entrained in the air but enabling the movement of air to and through said opening. 7 a

References Cited in the file of this patent UNITED STATES PATENTS 1,684,601 Shpater Sept. 18, 1928f 1,919,782 Fischbein July 25, 1933 2,483,036 Christensen Sept. 27, 1949 r 2,627,829 Wallenberg et al. Feb. 10, 1953

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