US 3559227 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
Y Feb.1! ,.ll971 G. R. scHLElcHER 3,559,227
wINnow CLEANING bEvIcE Enea Apri-1 14, 1969 54 sheets-sheet 1 f 62 a6 a7 73 g2 ,1,6 /f 68 F50 6.9 In "46 f," se
4 l Y 0 -r--Z 56 f/f :fa/,f i E f7 f/ 30 f /7 5 Y E ya gy# Afaz f5. ,f k f4 'i9 24 l zo# ,f L 7, Amig 4 5g 52 INVENTOR George R. .Schleicher BY Wwf G. R. SCHLEI'CHER WINDOW CLEANING DEVICE y Feb. 2, 1971 5 Sheets-Sheet 2 med P1311 14, 1969 INVENTQR l iso/gel Sch/sicher' BY u7 ATTORNEY.;
G. R. scHLVElcf-IR wmnow CLEANING DEVICE Filed April 14. 1969 5. Sheets-Sheet 5 INV ENT OR .S egrge RSc/r/e/'c'her Y @Mg/w? ATTO NEYs Feb.y 2, 1971 G. R. QCHLEICHER wINnow CLEANING DEVICE 5 Sheets-Sheet 4 Filed April 14, 1969 INVENTOR ATToREYs 3,559,227 WINDOW CLEANING DEVICE George R. Schleicher, 1749 Grand Concourse, Bronx, N.Y. 10453 Filed Apr. 14, 1969, Ser. No. 815,643 Int. Cl. A471 1/08 U.S. Cl. 15-250.04 11 Claims ABSTRACT F THE DISCLOSURE A window cleaning device whereby the outer side of a window may be readily and easily washed without the necessity of the operator or washer passing through the windowto the outer side thereof, the construction being such as to permit the washing of the outer side of a window by an operator positioned at the inner side of the window with ease. The device consists of a squeegee mounted and carried on a frame and wheel operable over the 'window sill and provided with two handles, one for each hand of the operator, the squeegee being on the outside of the window when in operative position the handles being inside the window actuating the device. A small container of detergent and water is connected to the squeegee and a highly controlled slow drip of water is delivered to the squeegee wiper blade end just sufficiently to lubricate and clean the blade and to wash the window surface.
The invention relates to new and useful improvements in 'window cleaning devices for the outside of the window from the inner side thereof.
An important object of the invention is to provide a window cleaning device with an inclined wheel adapted to ride along the window sill for carrying the squeegee therealong on the outside of the window pane and a pair of handles inside the window for manipulating the device and actuating the wheel over the sill.
Another object of the invention is to provide means for supplying a constant slow drip of detergent and water to the Wiper blade during the cleaning operation, the device being controlled from inside the window.
Other objects of the invention are to provide a window cleaning device of this kind that is durable, simple in construction, light in weight, adjustable to diiferent window heights, economical to manufacture and eiiicient in operation.
For a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:
FIG. 1 is a vertical sectional View taken through a window showing my window cleaning device embodying the invention in operative position thereon upon the lower window raised slightly to accommodate the movement of the device along the window sill.
FIG. 1A is a bottom perspective View as seen along line 1A-1A of FIG. 1 and showing a socket for the attachment of a third handle thereto.
FIG. 2 is a fragmentary perspective view of the means for mounting the detergent and water bottle upon the squeegee arm and its connection to the wiper blades.
FIG. 3 is a fragmentary perspective view of one handle with the air tube means for controlling the liow of water from the bottle to the wiper.
FIG. 4 is a detail elevational view of the wheel and handle means for moving the device across the window ane. p FIG. 5 is an enlarged sectional View taken on line 5-5 of FIG. 4 of the wheel and internal cone angle mounting means therefor.
FIG. V6 is a detail elevational View of a modilied form United States Patent Oce Patented Feb. 2 1971 of one of the handles for manipulating the cleaning device across the window.
FIG. 7 is a view similar to FIG. 1 of my window cleaning device constructed according to another modified form of the invention.
FIG. 8 is an enlarged vertical sectional view taken on line 8 8 of FIG. 7 of the wheel and looping into the large diameter end of the angle mounting means thereof.
FIG. 9 is a vertical sectional View taken on line 9 9 of FIG. 8.
FIG. l0 is a detail fragmentary perspective view of one mechanism for controlling the flow of water to the water supply hose.
FIG. 11 is a view similar to FIG. 1 of the squeegee blade and water container removed from the wheel support and applied to a handle piece for single hand operation on the inner side of the window.
FIG. l2 is a fragmentary perspective view of a squeegee wiper blade showing a modified connection between the water hose and the blade to adapt the squeegee for use under the overlapped upper window when the lower window is being raised to clean.
FIG. 13 is a cross-sectional view taken on line 13-13 of FIG. 12.
FIG. 14 is an enlarged vertical sectional view taken on line 14-14 of FIG. 13.
FIG. 15 is a perspective detail View of the connecting sleeve shown in FIG. 12 for the exible supply tube with the wiper blade.
FIG. 16 is a fragmentary vertical view of a still further form of cleaning device in which the supply detergent and water bottle can be located on a separate support inside the window and free of the cleaning device except for the rubber hose connection thereof extending to the rubber blade water outlet.
FIG. 17 is a fragmentary rear elevational view of the upper wiper end of the window cleaning device.
FIG. 18 is a fragmentary collective view of the adjustable connection between the U-shaped frame leg and the wiper supporting sleeve, and
FIG. 19 is an enlarged fragmentary View of the hose tube nozzle snapped fastened over the upper edge of the blade to deliver the detergent and water to the top of the blade and window surface.
Referring now particularly to the form of the invention shown in FIGS. 1 to 4, a window cleaning device 10 is illustrated, in operative position on the pane 12 of the lower sash 14 of a window raised slightly to accommodate the cleaning device. The pane 13 of the upper sash 15 is shown thereabove. The device 10 is placed against shoulder 16 for guided movement across the window sills, a portion of the device protruding inwardly from the window from which handles extend to work the device.
The window cleaning device 10 comprises an elongated generally U-shaped frame 15, of bar metal, square in cross-section, having an elongated vertical leg portion 17, a horizontal bight portion 19 and a shorter vertical leg handle portion 21. An internal cone surfaced metal ring 20 is positioned around the bight portion 19 adjacent the short leg portion 21. The lbody of the ring 20 is disposed at a slight angle to the horizontal as viewed in FIG. 1 and turnably carried upon the ring 20, is a plastic wheel or roller 24, FIG. 5, having an integral hub portion 26 rotatably supported upon a stub shaft 28 threaded into a hole in the ring 20 and engaging the lower face of the bight portion of the frame. The stub shaft 28 is disposed at an angle to the horizontal similarly to the wheel 24 so that the body of the wheel is also disposed at an angle to the horizontal. The plastic wheel 24 turns on the shaft. A plastic hand knob 30 is xed upon the top end of the short leg portion 21 serving as one handle. Another handle member 32 consisting of a metal strap, turned upon itself midway its ends forming spaced parallel arms 34 and a connection bight portion 36, is pivotally mounted at its spaced free ends on pivot pin 38 extending through aligned holes in the ring and engaging the sides of the bight portion 19 of the U-shaped frame 15, the arms 34 spanning the ring 20 and the bight portion 19 of the frame and the short leg portion 21.
A squeegee blade device 40 is pivotally mounted on a telescopic extension 17 retained in adjusted position on the free end of leg portion 17 of the frame 15 by a hand fastening screw 17, the mounting consisting of a U- shaped clamp bracket 42 having side portions 44, 44 connected by a `bight portion 46 and with extensions 48, 48. The squeegee blade device 40 has an elongated rubber blade 50 clamped along one long edge therebetween the sides 52, 52 of an elongated metal member 54. The blade member 54 is pivotally mounted on a pivot pin 56 extending through aligned holes in the clamp extensions 48, 48 and the metal plate 54. The rubber blade 50 can extend under the lower edge of the upper window pane 13 and out the slightly raised lower window pane 12 at the top thereof.
The frame 15 with the squeegee device 40 is attached thereto and adapted to be manually passed across the window panes by grasping the handle 30 in one hand and the handle member 32 in the other hand and moving both hands laterally over the window sill. During this operation, the wheel 24 rolls along a shoulder 58 on the window sill and is guided thereby, with the wiper blade 50 in engagement with the outer surface of the pane 12 of the lower window pane 12 as seen in FIG. 1. The angled position of the wheel 24 facilitates this movement. After making the rst pass and return across the top of the window pane 12, the lower pane 12 is raised to locate the wiper blade 50 thereon for the second pass and return across the pane 12. The lower window pane 12 can be again raised for further passes of the wiper blade 50 and in this manner continued until the full window pane is washed.
According to the invention, it is contemplated that the rubber wiper blade 50 of the squeegee device 40 be moistened. For this purpose, a detergent or water bottle is mounted in upright position above the top of the squeegee device 40 on an elongated bracket frame 62 having inwardly bent ends 64 and 66, the end 66 being turned upwardly at its extremity as indicated at 68. The turned up end 68 is inserted into the clamp bracket 42 alongside the top end of the leg portion 17 and is clamped in position by a set screw 69 passing through a hole in the bight portion 46 of the clamp bracket 52. Flange 64 supports the bottle 60. The bottle contains detergent or water 70 adapted to ow by gravity onto the wiper 50. The bottle is closed at the top by a removable cap 72 having a conical air inlet 74 and has a water outlet 76 in the bottom thereof.
A short water hose 78 has one end attached to the water botttle outlet 76 and extending through a hole in the ange 64 of the bottle supporting frame bracket 62. The other end of the water hose is inserted under a metal strap'80 xed over the top end of the blade member 54 of the squeegee device 40, so that the free end of the hose is in position over wiper blade edge 82, FIG. 5. The water hose 78 passes through a sheet metal hose clamp 84 xed on the bracket frame 62 by means of a sleeve 86. An integral spring finger 87 normally interlocks with a curved ange 90 to squeeze the hose and stop the passage of water therethrough.
An elongated air hose 92 has one end attached to the conical air inlet 74 on the removable cap 72 and extends downwardly along the U-shaped frame 1S to the top of the short leg portion 21 thereof where the free end is supported by a tiltable hose clamp plate 94 clamped to the handle 30 by means of a spring bracket 96. The hose clamp 94 has a bent end 98 at its lower end, FIG. l, normally pressing against the air hose 92 thereby shutting off the entrance of air thereinto from its free end 102. By
pressing inwardly on the other end of hose clamp plate 94, the bent end 98 moves outwardly away from the air hose permitting air to pass therethrough and upwardly to the top of the detergent bottle 60. Rubber rings 100, 100 on leg portion 17 of frame 15 guides and supports the hose 92 therealong.
With the construction herein set forth, it will be seen that to wash the window, the lower sash 14 is opened to allow the washing device 10 to be passed outwardly over the window sills. The bottom sash is then lowered and the device 10 positioned as shown in FIG. l, with the bight portion 19 of the U-shaped rod frame 15 under the lower rail of the lower sash 14, with the handles 30 and 32 inside the window and with the squeegee 40 in engagement with the pane 12 of the lower sash 14 under the upper pane 13 and at the very top thereof. The wheel 24 is held against the shoulder 58 of the window sill 18 as shown in FIG. l. The operator grasps handle 30 with one hand and handle 32 with the other hand and manually moves the device 10 along the window sills and across the pane 12, the wheel riding along the shoulder 58 of the sill and the wiper blade 50 moving across the pane 12. At the start of the washing operation, the spring iinger 87 is released from its interlock with the curved flange 90 of the hose clamp 84 whereby pressure of the air hose 78 is released. By pressing the hose clamp plate 94 inwardly by the nger of the hand holding handle 30, the bent end 98 of plate 94 is released from its engagement with the air hose 92 thereby permitting air to enter the entrance end 102 of the air hose so that detergent or water may drip by gravity into the water hose 78 onto the upper end of the wiper blade 50. The hose clamp 96 is released on the return pass of the device 10 over the window pane to withhold the detergent and allow the window pane to be wiped clean ofthe detergent.
An adapter tubular sleeve 104 is shown xed on the bight portion 19 of the frame 15 for releasably mounting a third handle 106, FIGS. lA- and 4. The sleeve 104 has a slot 108, intersecting one end thereof for receiving a set screw for removably securing the angled shank 112 of the handle 106 in position. The handle 106 may be used for manipulating the washing device 10 when a different handhold is desired.
In FIG. 6, a handle 114 is formed of a flat rectangularshaped plastic plate 116 with a reduced end portion 118 with a hole therein. A U-shaped bracket 120 is slidably mounted on the bight portion 19 of the rod frame 15 and has sides provided with aligned holes registering with the hole in the reduced end portion of the handle to accommodate a threaded clamping bolt 122 extending through the bracket and handle and secured by a wing nut 124. This handle 114 serves the same purpose as handle 106.
A modified window washing device 10' with a slightly different U-shaped frame 15 shown in FIGS. 7 and 10, includes a modified apparatus for holding and supplying water to the Wiper 50 is shown. A different shaped bracket 62' has a bent end 68 clamped in bracket 42 by set screw 69. The other end of the bracket 62 is bent to provide a support for a water bottle 60. This bottle is open at the top with a beaded rim 126 and is closed by a removable cap 72 having a disc-shaped body 128 with a downwardly extending peripheral ange 130 adapted to snap over the beaded rim 126. The cap is retained on the neck of the bottle by ring 132 connected to the flange 130 by an integral connecting strip 134. The bottle 60 has an outlet 60 from which water hose 78 extends and its free end is secured to the top end wiper blade of plate 52 by a strap 80'. The water hose 78' passes from the outlet in the bottle through a channel-shaped member 138 on the bracket 62 through a transverse hole `139 in the bracket and downwardly therealong in a groove 142 in the other side thereof, and under a metal ring 86' on the bracket 62. A set screw 144 extending through a hole 86 in the ring engages the water hose in the groove to clamp the hose to cut olf the supply of water to the wiper blade 50. The sliding channel-shaped member 138 has an extension extending under ring 86 and is bent outwardly at its free end forming a nger piece 148 used for sliding the member 138. The plate 138 is held in adjusted position by a set screw 150 on the ring 86.
When it is desired to supply water to the wiper blade 50 set screw 144 is turned to release the water hose 78 and cap 72 is opened to admit air to the top 0f the bottle so that water drips from the hose onto the wiper by gravity.
In this form as shown in FIGS. 8 and 9, the bore of the ring 20 on bight portion 19' is tapered as-indicated at 152 instead of being straight as in FIG, 1. Stub shaft screw 28 rotatably secures a wheel 24 to the ring 20. The wheel is enclosed with a shell 153 of rubber to have frictional engagement with sill S. The window washing device 10 is similar to device 10 and similar reference numerals used to indicate similar parts. By this construction the ring 20 can be angled upon the bight portion 1-9 of frame 15 to better adapt the wheel to the sill shoulder 16 and balance the bottle weight.
In FIG. 11', a window washing device 10" is shown adapted for single handed operation inside the window. In this form U-shaped member 15 has one of its elongated legs 156 clamped in the bracket 42" by set screw 69 to support the squeegee device 40". The other leg 158 is grasped by the hand of the operator to manipulate the device 10 of the window pane. A bottle 60 is constructed and supported similarly to the bottle 60" of FIG. 7, and with the water hose 78' connected to the bottle 60" and wiper 50".
In operation, the U-shaped frame .15 is grasped by the hand and device 10 moved across the pane 12" with the wiper 50" wiping the surface of the pane, the set screw 144" having first been released and the cap 72" removed from the top of the bottle 60".
" In FIGS. l2 and l5, a different means for operatively connecting one end of water hose 78a to wiper blade 50a of the squeegee device 40a. Hose 78a is connected to a sleeve 160 having bifurcations 162 which grip the sides of the U-shaped plate 52a of the squeegee device. Plate 52a has a hole 164 formed in its bight portion that permits the detergent or water to seep through on a wiper plate and upwardly and over the top end surface p 58a' of the blade, the upper of the plates 52a as indicated at 52a' rising above the blade top surface 58a" to direct the water flow forwardly over the top surface 58a'.
In FIGS. 16 to 19, a U-shaped frame 175 is formed of rod 0r tubing and includes a short leg 176 having a handgrip knob 177 at its upper end receiving a flexible detergent or water delivery hose 178 that is extended into the" knob end of the leg portion 176 and through its central hose 179'and outwardly through a side opening 181. The U-shaped frame 175 further has a bight portion 182 adapted to pass under the windows 12 and 13 which supports by a clip 183 a continuation of the hose 178 which extends upwardly along an outer leg portion 184 of the frame 175 and supported by further clips 185 and 186 thereon. The upper end of the leg portion 184 has an outwardly-extending threaded stud 187 over which a telescoping tube 188 extends for a slide fit with the stud being received in an elongated open ended slot 189. By applying a hand nut 191 to the stud 187 the sleeve 188 will be.- retained in its adjusted position therealong. The upper end of the sleeve 188 is forked as indicated at 192 and a wiper blade 193 is pivotally connected to the fork end 192 by a pivot pin 194 so that the wiper 193 may readily be accommodated to the window surface.
The hose 178 is further held upon the sleeve 188 by a clip or band 195 and extends upwardly as best seen in FIGS. 17 and 19 for connection to a nozzle pipe 196 having a hook end 197 that is tight fitted downwardly over the metal portion of a wiperblade 193 so as to deliver the detergent and water forwardly through a small hole or orifice 198 at the high point of the hook end 197 onto the top edge of the rubber wiper blade material 199 so as to lubricate and clean the wiper blade and provide detergent to wash the window surface. The hook end 197 of the nozzle pipe 1'96 is hollow throughout its length but closed at 201, FIG. 19, so as to limit the outflow of water `through the opening 198 in small amounts yet suicient to effect the complete cleaning of the window surface.
The detergent and water for this purpose is contained in a bottle 203 that is supported by a double bent wire hook bail 204 over a molding 205 above the wiper blade 193 outside the window so that the detergent and water can flow by gravity. The bottle 203 has a nozzle 206 by which the hose tube 178 is connected with the bottle 203.
Under the handgrip knob 177 is secured a plate 207 which can be flexed by depressing with the linger an upturned end 208 of a plate 209 secured by rivets 210 to the depending end of plate 207, An inwardly turned end 211 is adapted to engage the hose tube 178 against the short leg portion 176 of the frame 175 just below the opening 181 so as to normally maintain the tube 178 against passage of the detergent and water but when flexed by the finger to the position shown in FIG. 16 the water is allowed to pass upwardly through the hose tube 178 to the hook end nozzle pipe 196 and be discharged through its hole 198 over the upper end of the wiper blade 193 and onto the window surface being cleaned.
A U-shaped handle member 214 Similar to that used in the other forms of the invention is connected by pivot pins 215 along with a plastic wheel 216 in the same manner as described in connection with the other forms of -the invention as shown in FIGS. 5 and 8. The wheel 216 when the cleaning device is put into use abuts shoulder 16 for guided movement across the window sill S.
All of the above forms of the invention are preferably made from parts of lightweight metal such as aluminum and plastic and which can readily be handled by the two hands of the operator and retained in the vertical position against the window surface so that a clean sweep of the window surface is eected squarely from one side of the window to the other. when one pass of the cleaning device has been made across the window and returned without water one portion of the window is cleaned. The lower window 12 is thereafter raised to do the neX-t portion of the window in a similar manner and the iinal cleaning as effected on the last and bottom pass upon the window, the lower window being raised each time. When the upper window is to be cleaned it is brought down to the lowered position and the lower window will have been raised after being cleaned to the upper position. The top portion of the upper window is then rst cleaned in the same manner with the window being raised and returned toward its upper position with each successive cleaning pass of the wiper blade. Finally when both windows have been cleaned the cleaning device is unseated from the sill shoulder 16 and drawn inwardly through open windows and taken to the next window for cleaning, the windows just cleaned having been closed. The next window will be cleaned in the same manner.
What is claimed is:
1. A window washing device comprising a U-shaped frame with leg and bight portions, a wheel, and means for mounting the wheel upon the bight portion of said frame with its wheel axes extending parallel to and adjacent one leg portion thereof, a squeegee device pivotally mounted on the end of the other leg of the frame, said squeegee device including an elongated metal member and a rubber wiper blade in said metal member, a handle on the free end of said one leg of the frame, another handle pivotally connected to -the means for mounting the wheel upon bight portion, the-bight portion of the frame being adapted to lie over the sill with wheel thereon and the handles on the inside of the window pane -to be washed while the squeegee device bears against the outside thereof.
2. A window washing device as defined in claim 1, wherein the wheel is mounted at a slant to the vertical, said mounting means of the wheel including oversize ring around the bight portion of the frame adjacent the one leg thereof, said ring being tilted at a slight angle to the vertical and from the bight portion, a stub shaft carried by the wheel axially thereof, said stub shaft extending through a hole in the ring and engaging the underside of the bight portion of the frame, said wheel being turnable on said stub shaft, the axis of said stub shaft being aligned with the vertical plane of the ring and perpendicular to the axis thereof.
3. A window washing device as defined in claim 1, wherein the handles are so arranged and positioned relatively to one another that one hand of the operator may grasp one handle to keep the squeegee tilted against the window while the other hand grasps the other handle to move the wheel and frame along the sill and the squeegee across the pane of glass being washed.
4. A window washing device as defined in claim 3, and a container of water supported on the top end of the other leg of the frame, said container having an inlet for air and an outlet for water, an air hose connected at one end to said inlet and extending to the one handle, clamp means for closing said opening within reach of the finger of the operator when manipulating the handle on the one leg, and a water hose connected at one end to the outlet in the container, and to the upper end of the wiper blade of the squeegee device for moistening the wiper blade and spilling water to pane surface.
5. A window washing device as defined in claim 4, wherein the hose clamp means within reach of the finger of the operator while having his hand on the one leg handle of the frame for controlling the entrance of air into the air hose consists of an elongated plate tiltably and biasingly mounted on the one leg adjacent the handle on the top end thereof, the end of said air hose being carried on the end of the tiltable plate, a flange on one end of the tiltable plate adapted to press the air hose against the side of the leg to squeegee the same for preventing air passing therethrough.
6. A window washing device as defined in claim 1, wherein the U-shaped frame has the one leg short and the other leg long, said squeegee being supported on the top end of said long leg, said other handle being U-shaped and swingable in the vertical plane of the short leg, the handle, legs running along the sides of the wheel mounting means and pivotally connected thereto, the axis of the wheel being tilted at a slight slant to the horizontal bight portion of the frame.
7. A window washing device as defined in claim 6, and hose clamp means adjacent the outlet in the container for controlling the flow of water through the water hose, said hose clamp means including a plate-like bracket having a flange on one end and a spring finger constituting an extension of the other end, said spring finger having a bent portion midway its ends adapted to squeeze the water hose for stopping flow of water therethrough, said 8 squeegee device including a bracket removably mounted upon the upper end of the other leg, said hose clamp means being carried by the squeegee mounting bracket;
8. A window washing device as defined in claim 6, and a container of water supported on the top end of the long leg of the frame, said container being open at the top and having an outlet for water in the bottom end thereof, a removable cap for covering the opening in the top of the container, a water hose connected at one end to the outlet in the container, and extending to the upper end of the wiper blade of the squeegee for moistening said wiper blade, the cap on said container adapted to be open to permit air to enter at the top of the water in the container.
9. A window Washing device as defined in claim 6, wherein said squeegee device includes a metal plate, U- shaped in cross section, the rubber blade being clamped between the sides thereof, formed with a hole in its bight portion midway its ends, a sleeve having a bifurcated end, the bifurcations of the end of the sleeve grasping the sides of the plate of the squeegee device, the bore in the sleeve being aligned with the hole in the plate of the squeegee device, the other end of the bifurcated sleeve adapted to receive and accommodate the end of the water hose for moistening the member of the squeegee device, the top end surface of the rubber blade lying short of the end of the metal plate so that water upon being elevated in the metal plate will be directed outwardly over the top end surface of the rubber blade to spill thereof onto the blade and window pane.
10. A window washing device as defined in claim 1, a water bottle and a rubber hose extending therefrom, a nozzle pipe having hook-shaped and closed end adapted to tightly fit over the upper end of the metal and rubber wiper blade, said hook-shaped end having an opening to direct water flow over the upper end of the blade.
11. A window-washing device as defined in claim 1, and a water bottle, a rubber hose extending from the bottle through the handle and the one leg of the frame and outwardly of the leg to the wiper blade, a spring plate on the leg adjacent to the handle and overlying the hose exteriorly of the leg and adapted to normally clamp the hose thereagainst to restrict the water flow, the spring plate being in reach of the finger of the operator while his hand is upon the handle to tilt the plate from its clamping position and open the hose for flow of water to the blade.
References Cited UNITED STATES PATENTS 2,086,054 7/1937 Swenson 15-250.11 2,196,551 4/1940 Fischer et al. 15-250.,11X 2,323,555 7/1943 Matthews et al. 15-250.11
ROBERT W. MICHELL, Primary Examiner U.S. Cl. X.R. 15-250.11