US2912988A - Combined dishwasher and sink apparatus - Google Patents

Description

Nov. 17, 1959 F. A. KocHENDoRl-'FER 2,912,988

COMBINED DrsHwAsHER AND sINK APPARATUS Nav. 17, 1959 F. A. KocHENDoRFFER 2,912,988

COMBINED DISHWASHER AND SINK APPARATUS Filed Nov. 19, 1957 5 Sheets-Sheet 2 Nov. 17, 1959 F. AfKocHENDoRr-'FER .COMBINED DIsHwAsHER AND sINK APPARATUS Filed Nov. 19. 1957 5 Sheets-Sheet 3 m mm, m A MMM rm \m.N .m M Y,w *MQ B Mr@ Nov. 17, 1959 F. A. KocHENDoRx-'FER 2,912,988

COMBINED DIsHwAsHER AND sINK APPARATUS Filed Nov. 19. 1957 5 Sheets-Sheet 4 Nov. 17, 1959 F. A. KocHENDoRl-ER COMBINED DIsHwAsHER AND sINK APPARATUS Filed Nov. 19. 1957 5 Sheets-Sheet 5 Fredr/b/r Alexander lmchendorffer INVENTOR.

A BY ad 6mm R. NN @i NQ T United States Patent COMBINED -DISHWASHER AND SlNK APPARATUS Fredrick Alexander Kochendorli'er, Erie, Ia. Application November 19, 1957, SerialNo. 697,431

13 claims. (ci. 134-58) My invention relates to combined dishwasher and sink apparatus for use in Ithe kitchen or the like.

The primary object of my invention is to provide a dishwashing and rinsing apparatus for attachment to one end of a sink under a drainboard for the sink and which includes a sanitary dishwashing and rinsing cabinet swingable from an inoperative position in which it is hidden and out of the way under the drainboard into an operative position over the sink for draining wash and rinse water into the sink all to the end that no extra floor space is required for the dishwashing and rinsing apparatus in addition 4to that occupied by the sink and drainboard.

Another object is to provide apparatus as in the foregoing in which the washing apparatus includes perforated spray pipes for discharging spray of wash water against dishes in the cabinet and spray nozzle equipped pipes for rinsing the dishes together with means for connecting the perforated and spray nozzle equipped pipes to wash and rinse water discharge nozzles for water under pressure in response to swinging of the cabinet into operative position.

Still another object is to provide in the dishwashing and rinsing apparatus a tank for supplying wash water to the wash water discharge nozzle, means communicating the tank with the sink at one end thereof for ow of Water from the sink into the tank to the wash water discharge nozzle, a pump in the tank for pumping water therefrom out of the wash water discharge nozzle and a motor for driving the pump hidden from view under the sink.

Still another object is to provide valve means for draining the sink and tank simultaneously at will for use of the sink alone when the cabinet is in inoperative posit1on.

Still another object is to provide valve controlled means for connecting the rinse water discharge nozzle to a domestic hot water boiler for rinsing the dishes with hot water.

Yet another object is to provide in the dishwashing and rinsing apparatus a switch for controlling the motor for operation and stopping thereof and including an operating lever and means operative by said lever when the motor is stopped to open the valve and whereby the dishes may be rinsed and washed by separate operations under control of a single lever.

Yet another object is to provide means for counterbalancing -the cabinet when it is swung into inoperative position.

Yet another object is to provide apparatus as in the foregoing which is of simple, inexpensive and durable construction and in which all parts are readily accessible for repair or replacement purposes..

These together wi-th other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a plan` view of my improved apparatus partly broken away and with the cabinet removed;

Figure 2 is a view in front elevation with the cabinet shown in full lines swung into operative position and showing in broken lines the cabinet swung under the drain board;

Figure 3 is a view in vertical transverse section partly in elevation taken on the line 3 3 of Figure 1;

Figure 4 is an enlarged view in vertical transverse section taken on the line 4 4 of Figure l;

Figure 5 is a further enlarged fragmentary view in vertical transverse section taken on the line 5 5 of Figure 4;

Figure 6 is an enlarged view in vertical section taken on the line 6 6 of Figure 4;

Figure 7 is an enlarged perspective view partly in broken lines of the cabinet;

Figure 8 is an enlarged fragmentary view in longitudinal section partly broken away and taken on the linel 8 3 of Figure 7;

Figure 9 is an enlarged fragmentary view in horizontal section taken on the line 9 9 of Figure 2 and illustrating details of the cabinet; Y

Figure 10 is an enlarged fragmentary View in rear elevation of the counterbalancing means for the cabinet;

Figure 11 is an enlarged plan view of a tray-forming part of the cabinet; l

Figure 12 is a view in longitudinal vertical section taken on the line 12-12 of Figure 1l;

Figure 13 is an enlarged fragmentary view in vertical section of the wash water discharge nozzle taken on the line 13 13 of Figure 4;

Figure 14 is an enlarged fragmentary exploded view trating in detail the control valve of the means for connecting the rinse water nozzle to the domestic hot Water boiler; and

Figure 17 is an enlarged fragmentary view in longitudinal section taken on the line 17 17 of Figure 7.

Referring to the drawings by numerals, and wherein there is illustrated a preferred embodiment 0f my invention the numeral 1 designates generally the sink which is of the duplex rectangular type having left and right hand wells 3, 5 and the usual swivel faucet 7 and corner supporting legs 9. v At one end, preferably the left hand end 11, the sink 1 is provided with a pair of outwardly projecting apertured side lugs 13 and a down turned lip 15 which the wash water supply tank 21 depends in elevated f position at the front and transversely of the stand with a rear wall 29 bolted, as at 31, to said ends 27 and a bottom central supporting leg 33 bolted as at 32 to a lug. 34 on said tank. A bottom V-shaped brace 35 connects. the lower portions of the rear legs 25 to the leg 33 and is suitably xed thereto. A rear transverse skeletonshelf 37 extends forwardly of and is suitably fixed to the rear legs and braced by diagonal braces 39 bolted as at 41 to ,v said legs 25 and shelf 37. The shelf 37 is disposed at' the lower portion of the stand 17 and serves a purpose presently described.

The unit 17 is detachably attached to the end Wall of the sink 1 in communication with the left hand Well 3 to receive wash water from said well 3 and by means of the following. The yfront wall 43 of the wash water supply tank 21 is cut down at its upper edge 415 and removably engaiged under the lip 15 with the top of said tank substantially level with the top of the sink 1 and rear and front end walls 47, 49 of said tank areapertured, as at 51, for receiving bolts 53 extended through the lugs 15 and said end walls 47, 49. A cylindrical inlet nipple 55 on the front wall 43 of said tank 21 projects through a circular port 57 in the end 11 of the sink 1. A removably sealing gasket 59 surrounds the nipple 55 within the well 3. As will be seen the tank 21 extends endwise transversely of the sink '1.

The drainboard 20 is vertically swingably mounted on the stand for swinging upwardly and rearwardly into upright inoperative position as shown in full lines in Figures l and 3 of the drawings for a purpose presently seen and for swinging downwardly and forwardly into forwardly and downwardly inclined operative position as shown in full lines in Figure 2 of the drawings and is slidable forwardly and rearwardly and spring tensioned for forward sliding for a purpose presently seen and by the following means.

A pair of lateral studs 61 on bottom lugs, as at 63, on the rear end of the drainboard 20 are pivotally and slidably engaged in horizontal slots, as at 65, in a pair of rearwardly extending lugs 67 on the rear legs 25. A pair of tension springs 69 suitably terminally attached to the studs l61 and to depending ears 71 on the side bars 23 urge the studs -61 and drainboard 20 forwardly. As best shown in Figure 2, the lugs 67 limit upward and rearward swinging of the drainboard 20 and when said board is in the downswung, forwardly slid, operative position, it overlaps the top of the tank 21 and the end wall 11 to close said tank and drain into the well 3 over a downturned front end drain lip 73 on said board.

The wash water and rinse water discharge nozzles 75, 77, respectively, comprise stand pipes 76, 7S in the tank 21 adjacent opposite ends 47, 49 of the latter and which have on upper ends thereof cylindrical vertical tubular seat members 79, 81 having beveled edge upper ends 83, 85 and vertically slidable on the pipes 76, 78 and spring loaded by coil springs 87, 89 therein interposed between said upper ends 83, 85 and collars 91, 93 on said pipes 76, 78. Upper end flanges 95, 97 and the stand pipes 76, 78 limit upward sliding of the seat members 79, 81.

The Wash water discharge nozzle 75 discharges water under pressure from the supply tank 21 and for that purpose the stand pipe 76 thereof is coupled at its lower end, as at 99, to a discharge neck 101 of a centrifugal pump 103 located in a depending water leg 105 at the rear end of the tank 21 and having a bottom drain sump 107 and an arcuate pocket 109 thereon above said sump.

The pump 103 comprises a cylindrical casing 111 inserted through a front opening 112 in the leg 105 and is provided with an inlet opening 113 in one side for taking in water from the leg 105, its other side being open and provided with a ange 115 and a cover plate 117 lbolted together and to the leg 105 as at 119. The shaft 121 of the pump impeller 123 is journaled in a bearing 125 in the leg 105 and extends horizontally beneath the sink 1 through a bearing 127 on the cover plate 117 and is aligned and coupled, as at 129, to the armature shaft 131 of a motor 133.

The motor 133 is bolted, as at 135, in suspended position beneath the sink 1 toa motor mounting bracket 137 of suitable skeleton form extending forwardly and horizontally from and suitably iixed to the leg 105 and suitably aper-tured -as at 139 to receive the bolts 135. A diagonal brace bar 141 is bolted as at 143, 145 to the bracket 137 andk pocket 109. The motor 133 may be connected by plug in leads, not shown, to an electric outlet box of a dwelling.

The rinse water discharge nozzle 77 is adapted to discharge rinse water from a domestic hot water boiler, not shown. For this purpose, the stand pipe 78 of said nozzle 77 rises from and is suitably xed by a plug 149 to a horizontal ledge 1-47 in the upper portion and front end of the tank 21, said ledge and plug closing the lower end of said pipe 7S. A horizontal hot water pipe 149 for connection to said boiler extends across the tank 21 in the rear thereof through the rear wall 29 of said tank into said tank with a flanged elbow coupling 151 and a clamping nut 153 thereon sealingly connecting said pipe 149 to said wall 29, said pipe being connected to the stand pipe 78 by a T coupling 155.

A quick acting valve 157 is interposed in the hot water pipe 149 in the tank 21 to control discharge of water from the rinse water discharge nozzle 77. The valve 157 is of a conventional type with a depending valve stem `159 spring loaded as at 161 for normally closing said valve and upwardly movable to open the valve.

A motor control micro-switch 163, normally open, for the motor 133 is operatively connected by leads 165 to the motor 133 and is enclosed in a switch box 167 on the front end 49 of the tank 21. A rock shaft 169 extends through the box 167 into the tank 21 and is provided with a cam 171 in the box 1'67 for closing said switch by operation of a hand lever 173 counterclockwise as viewed in Figure 2 from an on position to an off position indicated by legends 175, 177 on the front end 49 of the tank 21. A second cam 179 on the shaft 169 within the tank is operative to raise the valve stem 159 and open the valve 157 by operation of the lever 173 counterclockwise from the olf position to a rinse position indicated by a rinse legend 181 on the front end 49 of the tank 21. if the lever 173 is released in the rinse position the valve stern 159 in response to the urge of the spring 161 will rock the cam 179 and the rock shaft 169 to return the hand lever 173 and cam 171 to the off position.

The means for draining the tank 21 and the sink 1 comprises a drain valve 185 having a T casing 187 and a valve member 1'89 in said casing on a plunger stem 191 upwardly slidable in a top tubular guide 193 on said casing 187 to unseat 'and open said valve 185. A spring 195 in the casing 187 normally retracts the stem 191 and valve member 189 to close'the valve 185. The plunger stem 191 is rotatable clockwise as indicated in Figure 4 to engage a locking tongue 194 with a locking lulg 196 on the guide to lock the valve 185 open and said stem is rotatable in the opposite direction to disengage the tongue 194 from the lug 196 for closing of the valve 185 by the spring 195.

A short lateral pipe line 199 detachably connects the valve 185 to the sump 107 for draining the tank 21. A rearwardly extending main dnain pipe line 201 is coupled to the bottom of the valve casing by an elbow 203 and nipple 205 to extend over and close to a floor to discharge remote from the apparatus. A right angled drain pipe line 207 connects the bottom of the left well 3 to one side of the valve casing 187. Another right angled drain pipe line 209 connects the bottom of the right well 5 to a fitting 210 in the main drain pipe lineV 201. A vertical overflow pipe 211 is suitably detachably connected to the tank 21 as at 213 and is coupled to the main drain pipe line 201 by the fitting 210.

The cabinet 19 comprises a rectangular open frame 21S best shown in Figure 7 and which extends endwise longitudinally of the sink 1 and stand 17. The frame 215 comprises at one end a pair of corner upright pipes 217, 219 having a pair of outwardly facing angle bars 221 suitably fastened thereto in upright position and a pair of upper and lower cross pipes 223, 225 communireating. with the pipes 217, 219 by means of elbow couplings 227, 229 and T couplings 226, 228, the pipes 217, 219, 223, 225 and couplings forming a rectangular rear end manifold on the frame 215. At its other end forming a front end of the frame 215, said frame comprising a pair of outwardly facing angle bars 230, 232 connected by a pair of upper and lower transverse angle bars 231, 233 with channels facing inwardly of said frame.

A pair of upper and lower longitudinal side pipes 235, 237 are terminally coupled to the elbow couplings 229 and T couplings 228 at one end and at their other ends to upper and lower sleeve couplings 239, 241 on the angle bar 232 and a pair of upper and lower longitudinal side rods 243, 245 are secured at their ends to the elbow coupling 227 and T coupling 226 and to the angle bar 232 at their outer end by sleeve couplings 234.

Longitudinal perforated top and bottom laterally spaced W-ash water spray pipes 247, 249 are connected at one end to nipples 251 on the pipes 223, 225 with locking nuts 253 on said ends and have their other ends beveled and seated with a sealing flt in the angle bars 231, 233, as shown in Figure 8 with reference to one of the pipes 249. As will be understood the top and bottom water spray pipes 247, 249 spray downwardly and. upwardly respectively.

Top and bottom rinse water spray pipes 255, 257 with downwardly and upwardly opening iine spray nozzles 259 and 261 thereon are secured by T couplings 263, 265 to the pipes 235, 237 to extend transversely of the frame 215.

A pair of angle side track bars 267 are suitably iixed in the lower portion of the frame 215 longitudinally thereof to the pipes 217, 219 and angle bars 230, 232 for a purpose presently clear.

A sheet metal hood 271 closes the top and sides of the frame 215 and is bolted as at 273 to the angle bars 221, 227, 229 through bolt holes 275 in said bars.

Upright pairs of front and rear end channel guides 277, 279 are secured to the channel bars 230, 232 and 221 at the front and rear ends of the frame 215 by the bolts 273 for front and rear vertically sliding doors 281, 283 for closing the ends of the frame 215. The doors 281, 283 are formed of suitably framed waterproof fabric panels 285, as best shown in Figures 3 and 9 in connection with the front door 281.

The upright pipes 217, 219 terminate below the frame 215 in a pair of wash and rinse water inlet nipples 387, 289 having internally beveled lower ends 288 a's best shown in Figure 8 in connection with the wash water yinlet nipple 287, and which are adapted to seat with a sealing tit on the seat members 79, 81 to admit wash and rinse water from the wash and rinse water nozzles 75, 77 to the pipes 217, 219 and 223, 225 forming the manifold end of the frame 215 and the pipes 223 and 225 are partitioned intermediate their ends by plugs 291, 293 to divert wash water into the Wash Water spray pipes 247, 249 and rinse water through the longitudinal side pipes 235, 237 into the rinse water spray pipes 255, 257.

The cabinet 19 is hinged to the rear wall 29 of the supply tank 21 for swinging upwardly and forwardly into operative position over the left wall 3 as best shown in Figure 2 and for swinging downwardly and rearwardly into the stand 17 between the side bars 23 in the rear of the supply tank 21 to rest on the shelf 37 as best shown in broken lines in Figure 2 and to seat the wash and rinse water intake nipples 287 and 289 on the seat members 79, 81 of the wash and rinse water nozzles'75, 77 in response to swinging of said cabinet 19 into operative position so vthat wash and-rinse water will be fed to the'wash water spray pipes 247, 249 and to the rinse water " spray pipes 255, 257 in the operative position of said cabinet.

For hinging the cabinet 19, a pair of lateral rearwardly extending hinge arms 295 on the nipples 287, 289 are pivoted as at 297 to a pair of rearwardly extend- Jing hinge arms 299 in the rear wall 29 of the tank 21. The hinge arms 295 seat in notches 296 in the rear wall 6 29 of the tank 21 to establish the operative position of the cabinet 19.

The counterbalance means for the cabinet comprises the following. One of the pivots 297 is xed to the hinge arm 295 of the frame 215 through which said pivot extends and this one pivot comprises a short shaft 100 extending outwardly horizontally rearwardly of the stand Y nal rack rods 118, 120 is provided for holding plates and the like therein in upright position and for sliding into the frame 215 on the track bars 267 into and out of the cabinet. If desired, an immersion type electric heater 269 may be inserted into the tank 21 through the front end wall 49 and suitably xed in said wall.

The operation of my invention will be readily understood from the foregoing and the following.

When it is desired to use the apparatus the drainboard '1 if swung downwardly and forwardly into operative position is slid rearwardly and swung upwardly into upright inoperative position as shown in Figures 1, 2 and 3. The cabinet 19 is then swung out of inoperative position into operative position, all as previously described.

'The tray 116 loaded with dishes is then slid into the frame 215 of the cabinet 19 through either end of the frame upon opening of the appropriate door 281, 283. When the cabinet 19 is swung into operative position the intake nipples 287, 289 are seated and sealed on the seat Vmembers 79, 81 of the wash water and rinse water nozzles 75, 77 so that wash and rinse water may be injected out of said nozzles 75, 77 into the wash water spray pipes 247, 249 and the rinse water spray pipes 255, 257.

The drainboard 20 may then be swung down into operative position to be slid forwardly by the springs 69 to engage its lip 73 with the rear side of the cabinet 19 and rest on the tank 21 as shownl in full lines in Figure 2.

The hand lever 173 may then be operated to on position to close the switch 163 and start the motor 133 and pump 103 to pump wash water from the tank 21 which has been fed with water `from the left well 3. Thus wash water will be forced through the wash water nozzle 75, nipple 287 into the pipe 217 and the pipes 223, 225 of the frame 215 to be diverted into the Wash water spray pipes 247, 249 for wash spraying purposes. When the washing operation is completed the hand lever 173 is moved to off position to permit the switch 163 to open and stop the motor 133 and pump 103 and the washing operation.

Next the hand lever 173 is moved to the Rinse position thereby rotating the cam 179 to lift the valve stern 159 to open the quick acting valve 157. This communicates the hot water pipe 149 with the rinse water nozzle 77 whereby water under pressure from a boiler to which said pipe 149 is connected will be forced through said nozzle 77, the rinse water nipple 289 into the pipe 219 to be diverted by the plugs 291, 293 into the rinse spray pipes 255, 257 and rinse nozzles. Thus the dishes 'will be rinsed by hot water.

After the rinsing operation the hand lever 173 may be released for return to off position in the manner already described, the tray 116 of washed and rinsed dishes may be removed from either end of the cabinet 19 by opening the appropriate door 281, 283, the drainboard 20 swung into inoperative position and the cabinet 19 swung into inoperative position, after which the drainboard may be swung into operative position and'slid forwardly by the springs 69 so that its front end wall overlies the tank 21 as shown in broken lines in Figure 2, whereby the drainboard may be used as part of the sink 1 and to close the tank 21.

By opening the drainvalve 18S in the manner already described the sink 1 and tank 21 may be drained.

By detaching the bolts 53 and the drain valve 185 from the sump 107 and tilting the stand 17 of the washing and rinsing unit downwardly and forwardly to disengage the water supply tank 21 from the lip 15 the entire washing and rinsing unit including the drainboard 20 may be detached from the sink. Then the drain valve 185 may be used together with the drain pipes 207, 201, 209 as drainage means for the sink. As will be understood the cabinet 19 drains into the left well 3 and the right well is for such purposes as soaking pots and pans therein.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

l. In combination a sink having a well and an end wall, a stand extending outwardly from said end wall and having a wash water supply tank opposed to said end wall, means communicating said well and tank through said end wall for ow of water into said tank from said well, an open bottom dish washing and rinsing cabinet having wash water and rinse water spray pipes therein, means hinging said cabinet to said tank for swinging from a down swung, inoperative position within said stand upwardly into an operative position over said well, a pair of wash and rinse water nozzles upstanding in said tank, and means on said cabinet for connecting said wash water and rinse water spray, pipes to said nozzles respectively in response to swinging of said cabinet into operative position, means including a motor for feeding wash water from said tank under pressure into said wash water nozzle, and means including a valve for feeding water under pressure from a remote source to said rinse water nozzle.

2. The combination of claim 1, and a drain board pivoted on said stand and swingable downwardly over the cabinet in the inoperative position of said cabinet and swingable upwardly into an upright inoperative position to permit said cabinet to be swung upwardly into operative position.

3. The combination of claim l, and valve controlled means for draining said sink and tank simultaneously.

4. The combination of claim 1, and means operatively connected to said stand and hinging means for counterbalancing swinging of said cabinet.

5. The combination of claim 1, said means for feeding wash water to said wash water nozzle comprising a pump in said tank operatively connected to said wash water nozzle, and a motor mounted on said stand and operatively connected to said pump.

6. The combination of claim 1, said cabinet having open ends, a dish receiving tray slidable into and out of either end of the cabinet, and doors for closing said ends of the cabinet.

7. The combination of claim 1, said means for connecting said wash and rinse water spray pipes to said nipples comprising a pair of depending nipples seating on said nozzles and manifold pipes in said cabinet communicating with said nipples and said wash and rinse water spray pipes.

8. The combination of claim l, and a switch on said tank operatively connected to said motor and having a switch closing lever, and means operatively connected to said lever for opening said valve by movement of said lever.

9. The combination of claim l, said cabinet including a rectangular frame having manifold pipes in one end, connected to said spray pipes, said means for connecting said spray pipes to said nozzles comprising a pair of nozzles connected to said manifold pipes and seating on said nozzles, one of said manifold pipes being partitioned to divert water to different spray pipes separately.

10. In combination a sink having an end wall, a stand extending outwardly from said end wall, an upright water discharge nozzle, means mounting said nozzle on said stand, said nozzle being adapted for connection to a source of water supply under pressure, an open bottom dish washing cabinet having spray pipes therein, means hinging said cabinet on said stand for swinging from a down swung inoperative position in said stand upwardly into an operative position over said sink to drain therein, and means on said cabinet for connecting said spray pipes to said nozzle in response to swinging of the cabinet into operative position.

ll. The combination of claim l0 and a drain board pivoted on said stand and swingable from an upright position downwardly over the cabinet in the inoperative position of said cabinet.

12. The combination of claim 11, said drain board being slidable on said stand over said nozzle when the cabinet is in inoperative position.

13. A cabinet for washing dishes comprising a rectangular open frame, said frame including an upright end manifold having a pair of top and bottom manifold pipes and upright side manifold pipes, said manifold pipes being joined together in right angular formation, said side manifold pipes having bottom nipples for passing wash and rinse water under pressure into each of said side manifold pipes respectively, longitudinal top and bottom spray pipes in said frame extending laterally from said top and bottom manifold pipes for spraying water therefrom, transverse top and bottom spray pipes in said frame extending across said top and bottom longitudinal spray pipes at a right angle thereto, top and bottom branch manifold pipes in one side of the frame communicating said transverse spray pipes with said manifold for conducting water from said manifold to said transverse spray pipes, and partitions in said upper and lower manifold pipes for directing wash water therefrom to said longitudinal spray pipes -and rinse water from said manifold to said branch manifold pipes.

References Cited in the file of this patent UNITED STATES PATENTS 563,663 Horrocks July 7, 1896 735,840 Strelitzer Aug. 11, 1903 799,331 Grothe Sept. 12, 1905 1,697,894 Wright Jan. 8, 1929 2,031,816 Blakeslee Feb. 25, 1936 2,264,846 Huebsch Dec. 2, 1941 2,268,900 Read Jan. 6, 1942 2,407,533 Brock Sept. 10, 1946 2,586,620 De Hart Feb. 19, 1952 2,619,099 Young Nov. 25, 1952 2,722,227 Lot Nov. 1, 1955

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