US1253535A

US1253535A - Suction-cleaner.

Info

Publication number: US1253535A
Application number: US75557813A
Authority: US
Inventors: William W Rosenfield
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-03-20
Filing date: 1913-03-20
Publication date: 1918-01-15
Anticipated expiration: 1935-01-15

Description

W. W. ROSENF|ELD- Patented Jan. 15, 1918.

' WILLIAM W. BLUSENFIELD, OF NEW WORK, N. Y.

suo'rlon' e'nnaunn.

Specification of Letters Patent.

Patented Jan. 115, 19118.,

Application filed March a0, 1913. Serial No. 755,57e.

To all whom it may concern:

Be it known that l, WILLIAM W. Rosen- FIELD, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements :in Suction-Cleaners, fully described and represented in: the following specification and the accompanying drawings, forming a part of the same.

This invention relates to a sound muflling device for suction cleaners. The invention has been made especially with the idea of providing means for mu ing the sound produced by electrically driven suction cleaners of the self-contained type in which the motor, fan, suction nozzle and dirt. receptacle 1 charge pipe leading from the fan chamber.

. my invention. I have found that by making (iii This sound is very considerably reduced by the discharge tube of a suitable length it is possible to mufiie or to avoid intensifying the vibrations of the air discharged through the tube under the action of the fan, such suitable length being a length which will not respond to vibrations corresponding to the operating speed of the fan, and, best and most conveniently for a cleaner of the type shown, a length greater than, but less than twice the length of, the shortest tube which will respond to vibrations set up by the fan, or vibrations corresponding to the operating speed of the fan.

There is more 'or less difl'erence in the speeds of revolution of the fans in difierent suction cleaners of the same make and style,

and even in any particular cleaner the fan will be driven at difierent speeds under varying operating conditions; and have noticed that-With lntendedly identical cleaners having discharge conduits of the same length, the noise due, apparently, to vibrations in the discharge conduit is much greater in some than in others. In order to meet the conditions resulting from such differences and variations in operating speed of the suction fans, I find it best that the total length of the discharge tube should be greater than that of the shortest tube which will respond to vibrations of the air corre sponding to the lowest normal operating speed of revolution of the fan and less than twice the length of the shortest tube which will respond to vibrations corresponding to the highest normal operating speed of revolution of the fan.

To provide a discharge tube of suitable length to serve the purpose of the invention,

ll preferably attach to the rigid discharge tube or conduit leading from the fan chamher, a muflier formed of a short piece of tube, preferably of flexible rubber fabric tubing, which extends into the porous receptacle ordust collecting bag. There is an additional advantage in having the tube project into the bag in that a space is thus provided aroundthe muflier tube in which dust discharged into the bag may collect.

In the accompanying drawing 1 have.

shown in side elevation partly broken away a self-contained suction cleaner provided with mufliing means in accordance with the present invention.

Referring to the drawing, the suction cleaner shown has a body formed by a motor casing 10 and a fan casing 11 joined one to theother and each being of cylindrical form and set horizontal. Secured to the front of the fan casing is a downwardly extral opening with the interior of the fan casing, the lower end of the casing 12 being contracted in the direction longitudinal of the machine and extended transversely of the machine to form a suction or cleaning nozzle 13 having its bottom edge or face formed with an elongated intake slot. The machine is supported by the suction nozzle and by a pair of running wheels 14 and is operated by means of a pivoted handle 15. A rotary fan 16 mounted within the fan casing is driven by an electric motor mounted Within the motorcasing 10. Adischarge passage 17 leads ofi tangentially from the bottom of the fan chamber and communilllifl cates through a backwardly leading discharge conduit or tube 18 with a receptacle 19 for the dirt and dust discharged from the operating fan chamber. The dirt receptacle 19 may be a bag or suitable close woven fabric as shown, one end being connected to the. dis-. charge conduit as by being secured to a short length of tubin 20 adapted to .slip into the end of the condilit 18, and the other end of the bag being suitably supported from the handle and being formed with an opening for cleaning out the bag which is n'ormally'closed; or any other suitable receptacle of a porous nature to'permit the air to escape while retaining the dirt, dust,

- scraps, etc. received from the fan, might be provided. Vhen the machine'isin use, the,

suction fan rotating at high speed draws the air in strongly through the intake passage and forces it out through the discharge passage, the dirt and dust from the carpet or rug or other material or surface over which the cleaner is moved being thus drawn in tension of the discharge conduit 18 into the dust collecting bag 19, being in the particular construction shown secured to the connecting pipe 20.- The effect of this muffler tube 25 is to make the whole discharge tube of a suitable length to muflle or to avoid intensifying the sound produced by the vibrations of the air through the tube under the action of the fan. The result might be obtained by simply lengthening the tube or conduit 18, but this. would, with the bag connected to the tube in the manner shown in the drawin s, bring the lower end of the bag 19 too ar in the rear of the-machine for convenience, and, furthermore, there is, as before pointed out, an important advantage in having the tube project into the bag since the dust discharged into the bag may thus collect around the muffler tube instead of falling back into the tube, and a clear passage for the discharge of air and dust from the fan charnber into the bag is maintained at all times. For this purpose the tube so projecting into the bag should, as shown, be self-supporting or normally non-collapsing, but also flexible so as to readily bend upward with the bag when the pivoted handle is thrown up to vertical position.

For best results, as before stated, the t0- discharged tarmac tal'len h of'the discharge tube including the mu er extension should be greater than that of a tube which will respond to vibrations of the air corresponding to the lowest normal speed of revolution of the fan and less than twice the length of the shortest tube which will respond to vibrations corresponding to the highest normal speed of revolution of the fan.

What is claimed is: 1. In a suction. cleaner, with a rotary suction fan and a porous receptacle into which a discharge conduit leads from thefan casing, of means for muffling the sound produced by the air passing sion of the discharge conduit an extending.

a substantial distance, into the porous receptacle.

2. In a suction cleaner, the combination with a rotary suctlon fan and a porous receptacle into the bottom of which a conduit leads from the fan casing, of a self-sustain the combination through the discharge conduit under the acing sound muffling discharge pipe of flexible.

rubber fabric tubing arranged to extend a substantial distance into the porous recep- "tacle so as to leave a space for dirt to collect about the end of said pipe.

3. In a suction cleaner, the combination with a rotary suction fan and a porous receptacle into which a discharge conduit leads from the fan casing, of a self-sustaining dis-- charge tube, the discharge end of which extends a substantial distance into the porous receptacle and whichis of a length greater than that of a tube which will respond to vibrations of the air corresponding to the lowest normal operating speed of the fan and less than twice the length of the short-, est tube which will respond to vibrations corresponding to the highest normal operating speed of the fan.

4. In a suction cleaner, the combination with a rotary suction fan and a dust receptacle of porous flexible material supported from a vertically swinging pivoted handle rod and connected at its ower end to the discharge conduit leading from the fan casing, of a flexible and normally non-collapsing discharge tube extending from the dis charge conduit into the dust receptacle so as to leave space for dirt to collect about said tube.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM W. ROSENFIELD. Witnesses: v EMIL W. OPPENHEIM, l a C. A. CORNELL. l