US3009343A - Laundry machine - Google Patents

Description

J. BOCHAN LAUNDRY MACHINE Nov. 21, 1961 5 Sheets-Sheet 1 Filed Feb. 10, 1960 HIS ATTORNEY Nov. 21, 1961 J. BOCHAN 3,009,343

LAUNDRY MACHINE Filed Feb. 10, 1960 ESheets-Sheet 2 FIGZ INVENTOR 3'0 H N 50!; H AN WWW H S ATTORNEY Nov. 21, 1961 J. BOCHAN 3,009,343

LAUNDRY MACHINE Filed Feb. 10, 1960 5 Sheets-Sheet 3 F'lGB INVENTOR J'OHN BOCHAN gym/ M H l S ATTORNEY Nov. 21, 1961 J. BOCHAN 3,009,343

LAUNDRY MACHINE Filed Feb. 10, 1960 5 Sheets-Sheet 4 INVENTOR 35a TOHN SOCHAN H 5 ATTORNEY Nov. 21, 1961 J. BOCHAN LAUNDRY MACHINE Filed Feb. 10, 1960 FIG. 7 IZ O O O O O O O O L 87 INVENTOR JOHN BOCHAN H l S ATTORNEY United States Patent 3,009,343 LAUNDRY MACHINE John Bochan, Louisville, Ky., assignor to General Electric Company, a corporation of New York Filed Feb. 10, 1960, Ser. No. 7,788 2 Claims. (CI. 6820) This invention relates to domestic laundry machines, and more particularly to an improved domestic laundry machine of the type which uses a conveyor belt arrangement for providing the motion of the clothes which is required during laundry operations.

It is an object of my invention to provide a laundry machine which includes novel means for effecting the motion of the clothing generally deemed necessary in order for laundry operations to be carried out effectively.

A further object of my invention is to provide a laundry machine wherein a conveyor belt system raises the clothes to the top of a receptacle in the machine and thereafter permits them to fall freely to the bottom, this cycle continuing during the laundry operation.

Yet a further more specific object of one aspect of my invention is to provide a laundry machine having a conveyor belt system therein in which a substantial part of the treating of the clothes is provided as they are released from the top of the conveyor belt system and allowed to fall to the bottom thereof.

Yet a further object of my invention is to provide such an improved machine wherein the conveyor belt system, in addition to providing movement of the clothes, is also effective after washing and rinsing operations to effect the removal of liquid from the clothes.

In carrying out my invention, I provide a laundry machine which has a clothes receptacle in which there is a relatively wide endless conveyor belt which is so driven and guided that at any given instant the belt has a first portion travelling in a substantially horizontal direction substantially below the top of the receptacle, and a second portion travelling from one end of the first portion in an upward direction toward the top of the receptacle. The second portion of the conveyor belt cooperates with suitable means which secure .the articles of clothing against the second portion so as to carry them upwardly to a point short of the upper end of the second portion, whereby the clothes then fall from the upper end of the second portion down toward the first portion. Suitable means, depending upon what particular treatment of the clothing is desired, are provided for treating the clothes, generally during their free tumbling descent toward the first portion.

The features of my invention which are believed to be novel are set forth with particularity in the appended claims. My invention itself, however, both as to its organization and method of operation, may best be understood by reference to the following description taken in conjunction with the accompanying drawings.

In the drawings,

FIGURE 1 is a front elevational view of a laundry machine, specifically a combination clothes washer and dryer, incorporating my invention in one embodiment thereof, the view being partly broken away and partly in section to illustrate details;

FIGURE 2 is a side elevational view of my invention, broken away to illustrate the components controlling and operating the clothes-treating equipment;

FIGURE 3 is a side elevational view of my invention, broken away to illustrate the clothes-treating equipment;

FIGURE 4 is a side elevational view of a second embodiment of my invention, partly broken away to illustrate the components controlling and operating the clothestreating equipment;

FIGURE 5 is a second side elevational view of the same machine shown in FIGURE 4, partly broken away to illustrate details of the clothes-treating equipment;

FIGURE 6 is a view along line 6-6 in FIGURE 5;

FIGURE 7 is a view along line 7-7 in FIGURE 5; and

FIGURE 8 is a view along line 8-4; in FIGURE 5.

Referring now to FIGURES 1, 2 and 3 of the drawings, and more particularly at first to FIGURE 1, there is shown a laundry machine, more specifically a combination washer-dryer, generally indicated by the numeral 1. The machine is provided in the conventional manner with an outer cabinet or casing 2 which is supported on a base 3 and which has as its upper surface a portion 4 which includes a lid member 5. Lid 5 can be opened so as to provide access through an opening 5a (FIGURE 3) in portion 4 to the interior of the machine. Top section 4 may also support a control panel 6 having suitable controls, generally indicated by the numeral 7, and a suitable indicating dial shown by the numeral 8.

An internal dividing wall 9 is provided from the front to the back of the cabinet 2 so as to divide the cabinet into two entirely separate sections or compartments 10 and 11. Within section 10 there are provided the transmission and controlling components, while in section 11 Y is provided the actual receptacle in which the clothes are treated and the equipment which performs the treatment on the clothes as controlled by the equipment in section 10.

Section 11 (see particularly FIGURES 1 and 3) includes an imperforate tub 12 which, as can be seen, substantially fills section 11 from the top almost to the bottom and from side to side. Within tub 12 three rollers 13, 14 and 15 extend substantially across the full width of the tub. Roller 13 is mounted upon a shaft 16 which extends through wall section 9 in sealed relation thereto and is connected to suitable driving apparatus which will be described herebelow. Roller 14 is mounted on a shaft 17 secured at the end of an arm 18 which in turn is secured on a shaft 19. Shaft 19 extends through wall 9 for a purpose which will also be hereinafter described. Roller 15 is mounted on a shaft 20 secured at the end of an arm 21 rotatable about a pin 22; suitable spring means 23 bias roller 15 to the right as viewed in FIGURE 3. Arranged so as to pass over the three rollers 13, 14 and 15 is a belt 24 which is provided with regularly spaced perforations 25 (FIGURE 1) and is of an appropriate width so as to extend substantially from one side to the other of the tub 12. Belt 25 may be formed of any suitable pliable material with substantial strength as, for instance, rubber with a fabric core.

Also mounted in section 11 so as to be within tub 12 are an additional pair of rollers 26 and 27 respectively mounted on rotatably supported shafts 28 and 29. Shaft 28 extends through wall 9 into engagement with driving apparatus as will be further described herebelow. An endless conveyor belt 30 is mounted to pass over the two rollers 26 and 27 so as to be driven by the rotation of roller 26. Belt 30* is preferably of substantially the same width as belt 24. Suitable tension may be provided in belt 30 by the provision of a small movable roller 31 mounted at the end of an arm 32 rotatably mounted on a pin 32a and biased to the right (as viewed in FIGURE 3) by a spring member 33.

It will readily be seen that with belt 30 positioned as shown in the machine, belt 24 is caused to take asubstantially L-shaped configuration including a generally horizontally extending portion 34 near the bottom of tub 12 and a generally upwardly extending portion 35 connecting with one end of portion 34. Spring 23, with its tendency to move roller 15 to the right, thereby also causes roller 14 to be moved over to the right on arm 18 as much as is permitted by the presence of roller 27.

In order to operate the belts 24 and 30, I provide suitable transmissions means which include, as viewed in FIG- URE 2, a driving motor 34a secured on base 3 of the machine in compartment 10. A pulley 35a is secured at the end of the motor shaft and is joined by a belt 36a (which may be of the conventional V-type configuration) to a larger pulley 36 mounted on shaft 28. In addition to the roller 26 and the pulley 36, I provide on shaft 28 a gear member 37 which meshes with a twin gear member 38 secured on the part of shaft 16 which extends into compartment 10. It will be seen that during operation of motor 3412 motion will be transmitted from pulley 35a through belt 36a to pulley 36 so as to rotate shaft 28 and, through gears 37 and 38, to shaft 16, with both shafts rotating at substantially the same speed. This rotation of the shafts 28 and 16 then causes the rollers 26 and 13 respectively secured on the shafts to drive their respective belts 30 and 24. The direction of rotation of the motor is clockwise, as viewed in FIGURE 2, so that portion 35 of belt 24 and adjoining portion 39 of belt 30 are both travelling in an upward direction.

With this driving arrangement, each point on belt 24 will repeatedly first be a part of the generally horizontal portion 34 thereof, then at the end of portion 34 become part of portion 35 of the belt, and then pass around the back of rollers .13, 14 and 15 so as to return to portion 34. It will readily be seen that any article landing on portion 34 will be carried to the left (in FIGURE 3) and will then be engaged by the belt 30 so as to be carried between portions 34 and 39 of belts 24 and 30 respectively upwardly between them. The resilient mounting of roller 15 and the movable arrangement of roller 14 permit both of these rollers to move so as to permit clothing, whether it be in bunches or single items, to pass between the two belts and be carried upwardly between the sections 35 and 39 thereof. In response to the introduction of bunched clothing between the two belts there is a force overcoming the action of spring 23 to move the rollers 14 and 15 to the left sufficiently to accommodate the bunched clothing and permit it to enter between the two belt portions 35 and 39.

It will be observed that the roller 26 is located somewhat below the level of roller 13 so that the top of belt 30 is substantially below the top of belt 24. When clothing has been carried upwardly to a point where it is released by the belt portion 39 it then must necessarily fall, lacking support; because of the motion of the belt 30 it falls over to the right and tumbles freely downwardly towards belt portion 34. In order to insure that all of the clothing tumbling down lands properly on the belt portion 34 and is not caught between the edge of the belt and the side of tub 12, suitable guiding means may be provided such as, for instance, guiding baffles, one of which is shown by the numeral 40. The batlie may, as shown, extend upwardly through perforated portion 41 so as to be secured at point 42 to the front of tub '12.

In order to effect the desired washing operation in the machine it is normally necessary to introduce water to the machine, and this may be done in the conventional manner. The water supply means includes connections 43 and 44 in section through which hot and cold water is supplied from a suitable source to the machine for the washing operation. A valve controlled by a solenoid 45 admits hot water to the machine and a valve controlled by a solenoid 46 admits cold water to the machine. The hot and cold water valves under the control of the solenoids 45 and 46 discharge through a common conduit 47 which has a downwardly extending opening outlet 48 discharging through a suitable air gap into a funnel 49. Funnel 49 is formed as an opening in the wall 9 so that water entering the funnel is carried into the compartment 11 and tub 12. Any suitable control means such as, for instance, a pressure sensitive mechanism 50 may be provided in order to terminate the supply of water after an appropriate amount has entered tub 12. For instance, a suitable water level is obtained when the water rises in the tub 12 to a level just at that of the portion 34 of belt 24.

In order to provide a washing action, the water is recirculated from the bottom of tub 12 by a pump 51 which may be driven by any suitable means such as, for instance, a pump motor 52. The pump 51 has a pair of outlets, one being connected to a recirculation conduit 53 and the other being connected to a drain conduit 54. When the pump rotates in one direction water is forced through the recirculation conduit and out into a pipe 55 having openings 55a positioned so as to cause the water to be sprayed into the portion of tub 12 through which the clothes fall once they have been lifted by the belts 24 and 30. Thus, part of the washing action of the machine is provided by lifting the clothes up and then dropping them through the spray of water which, for washing operations, may be caused to contain a suitable amount of detergent or other desired cleanser. The impact as the clothes land on the portion 34 of the belt effects a further mechanical cleaning action. Thus, the cleaning action of the machine is a combination of the chemical action of the detergent as it is introduced by the spray into intimate relationship with all portions of the clothing as it drops and of the mechanical washing action caused by the impact as the clothing lands on the belt portion 34.

Pump 51 is reversible and in its second direction of rotation causes the water in tub 12 to be passed out through conduit 54 to a suitable drain (not shown). While the recirculation and pumping system is per se not a part of my invention, a suitable pump for effecting this type of action is fully described and illustrated in my Patent 2,883,843, issued on April 28, 1959, and assigned to the General Electric Company, assignee of the present invention.

In order to remove a substantial part of the washing liquid at the end of a washing operation, the water may be removed as described by the draining action of pump 51. In addition, a substantial amount of liquid may be squeezed out of the clothes by passing them up between the belt portions 35 and 39. In order to increase the belt pressure on the clothes during this liquid removal portion of the operation, there may be provided suitable means such as, for instance, a lever arm 55b which is secured on shaft 19 and is connected at its outer end by a chain 56 to a pulley 57 operated by a small gear motor assembly 58. The gear motor assembly may be of the conventional type which may remain energized in a stalled condition without any harm to itself.

When it is desired to remove liquid from the clothes, the gear motor 58 is energized to cause pulley 57 to rotate so as to wind up the chain 56. The chain then exerts a force on the outer end of arm 55b which carries with it the shaft 19 and therefore the arm 18 and roller 14. As a result of this, the force exerted by the gear motor tending to wind up chain 56 on pulley 57 causes a substantially greater amount of force to be exerted by roller 14 in pushing belt 24 to the right against the belt 30 and roller 27 than is the case when a washing operation is being provided. During the removal operation, the pump 51 is operated by motor 52 in the direction to effect draining, as described, and thus all Water squeezed out of the clothes drains down to the bottom of the tub where it is removed by the pump.

It will be seen that with the apparatus described, a typical washing cycle which may, as a simple example, include a washing operation, a water removal operation, a rinsing operation, and a last water removal operation, may be provided.

I In order to give a complete laundering operation, the machine may further include suitable heat drying means so as to cause complete drying of the clothes to be effected after they have been squeezed to a state of partial dryness. In order to effect the complete drying, a conduit system 59 may be provided in compartment 10. The conduit system includes an inlet 60 which communicates with the atmosphere (for instance, by louvers 60a at the side of the machine 1) and through which air is pulled in by a blower assembly 61 which may be operated in any conventional manner such as, for instance, by a separate motor 62. The air pulled in by blower assembly 61 is then passed from the outlet 62a of the blower over a heater assembly 63 which may conventionally be of the electric type wherein resistance heating coils are connected across a suitable source of electric power. After passing over the heater assembly 63, the air then passes out through opening 64 into compartment 1-]. near the bottom front thereof. An air outlet 65 is provided at the back of the machine adja cent the top of the compartment 11, so that the heated air flows up in the compartment from inlet 64 to outlet 65. In so doing, it contacts the clothes which are tumbling down as a result of the action of belt portions 35 and 39. The heating of the clothes causes vaporization of the moisture in the clothes and migration of the vapor with the air out through outlet 65. Thus, in this manner, drying of the clothes may be effected in machine 1. I

The machine, as described thus far, is relatively basic in nature. It will, however, be recognized that many conveniences and safety features may be added without departing from thescope of the invention. As one example, in order to prevent even the slender possibility that operation of the machine will be fouled by clothes adhering to belt 24 and then passing over the top thereof and around the back thererof, a suitable perforated guard 66 may be provided. Under ordinary circumstances, guard 66 will simply operate to scrape off any clothes which may not previously have tumbled down toward portion 34 of belt 24. However, under particularly adverse circumstances, it may occur that there will be bunching of the adhering clothes such that a substan tial amount of force will be exerted on the member 66. Member 66 is secured to rotate a shaft 67 which in turn is secured to a switch operating mechanism 68 positioned to operate a switch 69. When the force of bunched clothes causes member 66 to move to the left (as viewed in FIGURE 3) shaft 67 is pivoted to cause member 68 to operate switch 69. Switch 69 may be connected to the electrical system of the machine (not shown) in the conventional manner to cause motor 34a to be shut off when this occurs so that damage to the machine is avoided.

A further improvement which may be provided is that of a pedal 70 which may be connected to a switch controlling motor 34a so that depression of the pedal causes the motor to run. The particular advantage of pedal 70 in this case will arise from the fact that the operator of the machine may keep the belts running intermittently while the lid is open so that all of the clothes are automatically brought up to her at the speed she desires. This will, in effect, cause the clothes to be fed up at the rate best suited to the operator who then need not lean down at all, but can merely pick up the clothes as they come up to a point just a little below the opening 5a.

It will, of course, be understood that the two examples of additional safeguards and conveniences which may be used with my machine as described are intended to be merely exemplary, and there is no intent to exclude the many other conveniences which will readily come to mind upon disclosure of my invention to those skilled in the art.

'In operation, a suitable control mechanism (not shown) of the conventional type is included and may be, as is also conventional, secured within the control panel 6 of the machine. In the complete cycle, the control mechanism will cause the machine to proceed through (1) a washing operation, (2) a water extraction operation, (3) a rinsing operation, (4) a water extraction operation and (5) a heat drying operation.

To summarize the various operations provided, the washing operation is effected, after an appropriate amount of water has been provided and the valves have been closed by central member 50, by energizing the motor 34a so as to cause belts 24 and 30 to operate as described, and energizing motor 52 to operate pump 51 in the direction to cause recirculation of washing liquid through outlets 55a. At this time, in the conventional cycle, the gear motor 58, blower motor 62 and heater 63 will not be energized. With motors 34a and 52 energized, the clothes are continually carried up by the cooperating belt portions 35 and 39 and then tumbled down onto belt portion 34 as water is taken by the pump and forced through conduit 53 and outlets 55a to spray onto the clothes as they drop. This action is the same for both washing and rinsing, it being understood that suitable treating liquids may be provided for either or both of these two operations, and that the water temperature may be varied by energization of either one or both of the valve solenoids 45 and 46.

The water extraction operation which is provided after the washing operation and the rinsing operation consists of the same movement of belts '24 and 30 by the operation of motor 34a with, in addition, the gear motor 58 energized and the direction of rotation of motor 52 reversed. The energization of the gear motor causes a substantially greater amount of pressure to be exerted on clothes as they pass up between the two belts 24 and 30 and the opposite rotation of pump 51 causes all freestanding liquid to be removed from the bottom of the machine.

When it is time for the drying operation, after the last extraction operation, the motor 34a continues to be energized, the motor 52 continues to be energized in its second direction, gear motor 58 is de-energized, and the blower motor 62 and heater 63 are energized. The action of motor 34a continues to cause the clothes to pass up toward the top of the receptacle and then tumble down toward belt portion 34. At the same time, as described, hot air is passing upwardly from inlet 64 to outlet 65 so as to dry the clothes. This action continues for as long as desired, either by a straight timed operation or as part of an automatic cycle of the type well known in the art, until the completion of the cycle at which time all components are deenergized and the clothes all lie on belt portion 34.

Now the operator need only open lid '5, and then operate the belts by means of pedal at a speed appropriate to feed the clothes up between belt portions 35 and 39 so as to bring them within easy grasping distance.

Referring now to FIGURES 4, 5, 6, 7, and 8, a second embodiment of my invention will be described, with like numerals being used for like parts.

The same type of driving system is used as before. In the case of the embodiment of FIGURES 5-8, the belt 36a drives a pulley 71 which is mounted on the same shaft 72 as a sprocketed roller 73. A sprocket 74 mounted on shaft 72 is connected to a sprocket 75 through a timing belt or chain 76 so as to cause the shaft 77 upon which sprocket 75 is mounted to rotate at the same speed 70 as shaft 72. Shaft 77 in turn is secured to a sprocketed roller member 78 so that rollers 73 and 78 are both posi-' 7 6 tioned so as to pass over the three rollers 73, 78 and 79 is an endless conveyor belt 81 which is similar to belt 24 of the first embodiment in that it has a substantial width, approximately that of the tub 12, and a substantial number of perforations 82.

A shaft 83 is rotatably secured, as shown in FIGURE 5, and a plurality of spaced pulleys 84 are positioned on the shaft 83 and are joined to pulley grooves formed in roller 73 by a plurality of V-belts 85 (see also FIGURE 7). It will readily be observed that the spaced V-belts passing over the roller 73 and the pulleys 84 constitute a support for the horizontally extending portion 86 of belt 81. The direction of rotation of rollers 73 and 78 is such as to cause each point on the surface of belt 81 to pass first through portion 86 and then to move on to the upwardly extending portion 87 of the belt which extends from the left end of portion 86 (as viewed in FIG- URE up to a point adjacent the top of the tub 12.

In contact with the back of portion 87 of the belt, so that the belt slides thereover, is a manifold 88 which, viewing FIGURES 5, 6, and 8 jointly, will be seen to consist of a housing in which a number of parallel grooves 89, all connected to a conduit 90, are positioned so that each is directly beneath a row of the perforations 82. With this construction, as the belt 81 slides upwardly over the surface of the manifold member 88, the conduit 98 is in communication through the grooves 89 in the manifold 88 with the surface of portion 87 of belt 81. Conduit 90 communicates with an assembly, generally indicated by the numeral 91, which includes a pump of any conventional well-known type and suitable means for separating moisture from air. Pumps of the general type suited for this purpose and conventional bathe means for separating moisture out of air are both well known and therefore are not shown in detail, it being understood that they are included in the representations of assembly 91. The assembly 91 includes an outlet 92 through which air is passed out of the machine and an outlet pipe 93 through which moisture (whose presence will be explained herebelow) may drip out into the bottom of the tub 12.

During the operation of the machine, the water circulation portion of the washing system is the same as before in that pump 51 causes recirculation of the water in spray form from outlet 55 into the tub 12. When assembly 91 is in operation, a substantial amount of suction is exerted through grooves 89 and perforations 82 on the surface of belt portion 87. Consequently, as clothes are carried by the movement of the belt to the bottom of portion 87 the suction exerted by the operation of assembly 91 causes the garments being washed to be held by suction to rising portion 87 so that the clothes are carried upwardly as long as the suction is exerted. Of course, when the clothes rise to a point above the top of the grooves 89 in manifold 88 there is no longer any means for holding these clothes on the belt portion 87 and the clothes consequently tumble downwardly to land on belt portion 86, while at the same time the washing action is provided by the spraying of washing liquid from outlets 55a together with the impact of the clothes as they land on the belt portion 86. The clothes thus go through this cycle continuously, being carried up on portion 87 by the suction exerted through the manifold 88 behind portion 87, and then tumbling down to be washed.

After the washing operation is complete, the water extraction operation is then provided by continuing the action of the assembly 91 While at the same time reversing the direction of pump 51. The reversal of the pump 51 causes the freestanding liquid to be pumped out to drain. At the same time, the powerful suction of air through the clothes as they are held on rising portion 87 of the belt 81 causes a very substantial amount of liquid to be extracted from the clothes.

The concept of this means of removing liquid from clothes is not my invention, but is fully described and claimed in application Serial No. 846,436, filed October 14, 1959, by James M. Finder and assigned to the General Electric Company, assignee of the present invention. During removal of the water in this manner, air is pulled through the clothes and a substantial amount of the water in the clothes is picked up by the air passing through the clothes and is carried with the air through conduit into assembly 91 where the air and water are separated, the air passing out through duct 92 and the water passing out through conduit 93 and then flowing to the pump 51 to be drained.

After a suitable period of this operation, the water extraction operation is terminated. Thus, the machine of FIGURES 4, S, 6, 7, and 8 may be caused to have a washing operation as described followed by an extrac tion operation as described, with these then being followed similarly by a rinse operation and a final extraction operation. The machine as described is simply a washing machine rather than a combination washing and drying machine. It will, however, be understood that heating means of any conventional type such as that described in connection with the embodiment of FIGURES 1, 2, and 3 may readily be incorporated in this embodiment and that a drying operation will be obtained with the action of the assembly 91 both providing the lifting power for the clothes and helping to dry the clothes quicker.

It will be seen from the foregoing that my invention provides, in all embodiments thereof, an improved washing machine wherein by use of a belt conveyor arrangement the operating parts of the machine are substantially simplified over what previously has been provided, with nonetheless fully effective operation in all phases of the home laundry field, namely, washing, water extracting, and drying.

While in accordance with the patent statutes I have described what at present are considered to be the preferred embodiments of my invention, it will be obvious to those skilled in the art that various changes and modifications may be made without departing from the invention and I therefore aim in the appended claims to cover all such equivalent variations as fall within the true spirit and scope of the invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A laundry machine comprising: a clothes receptacle; a relatively wide perforated endless conveyor belt, and means guiding said belt, said belt having first and second portions at any given instant, said first portion being positioned by said guide means to extend in a substantially horizontal direction substantially below the top of said receptacle, said second portion being positioned by said guide means to extend in an upward direction from said first portion toward the top of said receptacle; means driving said belt so that each point thereon passes through said first and second portions sequentially; means cooperating with said second portion to secure articles thereagainst thereby to carry them upwardly, said cooperating means comprising suction means positioned behind and in engagement with said second portion thereby to exert suction through the perforations in said second portion, said cooperating means terminating adjacent the upper end of said second portion so as to cause clothes to fall from said upper end toward said first portion; and means for treating clothes during their movement in said receptacle.

2. The apparatus defined in claim 1 wherein said drive means and said suction means cooperatively cause said belt to assume a substantially L-shaped configuration, the upper horizontal portion of the L constituting said first portion and the inner vertical portion of the L constituting said second portion, said suction means including a manifold positioned between the two rising parts of the 5,482 Porter Mar. 21, 1848 357,076 Fitzpatrick Feb. 1, 1887 10 Lambach Mar. 14, 189 3 Yates Meir. 25, 1924 Schenck Apr. 7, 193-1 Barifii May 12, 1942 Morrison Ian. 24, 1950 Johnson Sept. 26, 1950 Johnson Sept. 26, 1950

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