US 2027543 A
Description (OCR text may contain errors)
1936 v G. E. LOFGREN- 2,027,543
- SUCTION NOZZLE Filed. Oct. 7, 1935 2 Sheets-Sheet 1 g J v ATTORNEY 1935- G. E. LOFGREN- 2,027,543
SUCTION NOZZLE Filed Oct. 7, 1935 2 sheets-sheet 2 .23 a" u. Z I u x vi /m0 m W-W/MW fizzy. 6; i7 46 F 2f jfl 4 j Patented Jan. '14, 1936 UNITED STATES 2.027.543 I SUCTION nozzm Gustaf Einar Lotgren, Rye, N. Y., assignor t'o Electrolux Corporation, Dover, Deb, a. corporation of Delaware Application October i, 1933,' Serial No. 692,565
3 Claims. (Cl. 15-157) My invention relates to suction nozzles for vacuum cleaners and more particularly to nozzles .for picking up hairs or fibers which are relatively difficuit to pick up with nozzles used for large surfaces. Dog hairs and lint are difficult to pick up merely by suction. -Mechanical agitation is also ineffective for certain fibers, threads and the like. A combination of scraping and suction is practical, but scraping is not good for rugs and particularly for certain rugs of fine quality because the scraping cuts off the rug. Furthermore, a tool or nozzle having teeth or other scraping means does not readily move on many rugs, or at least not readily in one direction on a rug. The rug is sometimes soconstructed that the nozzle moves readily in one direction but not in the other whereas normal nozzle movement is backwards and forwards.
The object of my invention is to provide a nozzle for readily picking up lint, hairs, threads and the like without using mechanical agitation-or scraping. To this end I use a smooth surfaced nozzle capable of gliding easily in any d'rection on a mg or other surface, regardless of the fabric structure, and cause the air in small volume to have rotary movement, so to speak a cyclone eflect, adjacent the surface to which the piece to be picked up is adhering.
Thus the vortex twists the lint or other substance and the suction removes it. The accompanying drawings illustrate the preferred embodiment of myinvention.
Fig. 1 is a vertical central cross-sectional view of a nozzle embodying my invention and is taken on theline l-l of Fig. 2; I
Fig. 2 is a sectional view of the same nozzle taken on the line 2-2 of Fig.1 and on the line 2-2 of Fig. 3;
Fig. 3 is a bottom view of the nozzle shown in Figs. 1 and 2; i
Fig. 4 is a view taken on the line 4-4 of Fig. 2;
Fig. 5 is a vertical cross-sectional view of another embodiment of the invention, taken on lines 5-5 of Figs. 6 and 7;
Fig. .6 is a. cross-sectional view taken on the lines 8-6 of Figs. 5 and '7; and
Fig. '7 is across-sectional view taken on the line 1--1 of Fig. 5. v The nozzle l shown in Figs. 1 to 4 comprises an oval-shaped base portion or shank H and an upper tubular portion It. On the bottom of the base portion is a smooth contact surface l3. A
- central passage M- intersects the contact surface l3 and passes through the tubular portion It. The lower part or passage i4 adjacent the 'shown by the arrows B.
contact surface 13 may be termed the mouth of the nozzle and the lower part of the surrounding structure, essentially the base portion l|,may be termed the lip or lip structure of the nozzle, which surrounds the nozzle mouth. The upper or outlet part of the passage l4 istapered or otherwise formed to receive and engage the end I of an air hose connected to a source of suction suchas the fan of a vacuum cleaner. Passage I4 is preferably of circular cross-section as shown; It will be seen that the outlet connection is of greater cross-sectional area than the mouth.
A plurality of grooves. 66, which are preferably straight, are cut, cast or otherwise formed in is the bottom or contact surface I3 of the nozzle l'p. These grooves l6 extend from the vertical side wall of the base portion H to the passage 14. They open tangentially into the passage or mouth M. The passage It may be tapered inwardly at the bottom. The nozzle may be made of one piece and of any material'such as aluminum, hard rubber, or
a phenol condensation product. It is not essential that the bottom surface l3 be smooth but this is preferred so that the nozzle will glide easily on the rug l'l or other surface or substance to be cleaned.
In operation, air is drawn through the passage il in the direction of the arrow A. The nozzle being placed against the rug l1, air is drawn. through the open-sided grooves in the direction As this air passes through the grooves it, it is in contact with the carpet or other material to be cleaned and can 5 pick up dust or dirt therefrom.
The air enters the passage M tangentially from the grooves or channels l8 and consequently forms a vortex, the air rotatingabout and approaching the center of passage M. It will be seen that the lip provides 4 a deflector for each' air stream entering the nozzle, thereby assisting the forming of the vortex. This vortex is adjacent the carpet or surface to be cleaned and the whirl of the air twists any hairs or'flbers so that they are dislodged and taken up into the air stream which flows on helically into the upwardly extending passage M. The lower end of the passage may be inclined as shown so that dust particles thrown outwardly due to centrifugal force can readily pass upwardly in the passage ll.
Figs. 5, \8, and 'i show a duplex swivel nozzle embodying the invention. Attached to the hose end It is an elbow 20 having an internal passage 2| which corresponds to the upper part of the passage ll in the embodiment of Figs. 1 to 4. a
The elbow has an end piece 22 and is cut away at 23 to provide an opening for communication with either of the nozzle openings. The nozzle is provided with a large nozzle opening 24 and a smaller opening 25, which latter corresponds to the lower part 01 the passage I4 01' the embodiment of Figs. 1 to 4. In the position shown in the drawings the interior of the elbow 20 is connected through the opening 23 with the vertical passage or bore 25. The. passage 25 intersects the bottom smooth surface l3. This part oi. the nozzle is similar to that of Figs. 1 to 4. A plurality oi grooves or channels it are formed in the bottom surface and communicate tangentially with the passage 25. The elbow 20 is provided with a boss 28 into which is screwed a screw 21, forming a pivot whereby the body of the nozzle is adapted to rotate on the 'elbow 20. One side of the nozzle is provided with a weight 28 whereby on lifting the nozzle from the floor the weighted side is moved downwardly by gravityand the nozzle can be readily turned around. On turning the nozzle around, the opening 23 provides communication between the passage 2| and the large nozzle opening 24 while closing the communication between the passage 2| and the passage 25. The operation oi! the smaller nozzle of this embodimen't will be clear from the description of Figs. 1to4.. InthestructureshowninFlgaSto'l, the
nozzle opening 24 is used for ordinary rug cleaning and the nozzle is tumedaround to use the smaller opening 25 when it is desired to pick up a thread or the like which adheres to the carpet or other material being cleaned. 5 It will be understood that the invention is not limited to the structure shown and may be applied in a variety of forms to a variety 01' forms and sizes of nozzle. The invention is most effective, however, if used with a small nozzle open- 10 m I claim: 1. A suction nozzle having a mouth surrounded with a surface contacting lip, said lip being provided .with grooves forming communications be- 15 tween the mouth and the atmosphere when the nozzle is in operative position, said grooves being so arranged that a single vortex of air will be produced in said mouth during the normal operation of the nozzle, said lip providing a de- 20 flector for each air stream entering the nozzle thereby assisting the forming oi! said vortex.
2. A suction. nozzle as claimed in claim 1 in which the mouth is oi circular cross-section and the grooves are tangential to the mouth.
3. A suction nozzle as claimed in claim I having an outlet connection of greater cross-sectional area than the mouth.
oos'rar' EINAR 10mm. so