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Publication numberUS2385223 A
Publication typeGrant
Publication dateSep 18, 1945
Filing dateOct 21, 1938
Priority dateOct 21, 1938
Publication numberUS 2385223 A, US 2385223A, US-A-2385223, US2385223 A, US2385223A
InventorsMoore James R
Original AssigneeStanley G Harwood
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Clothes-drying machine
US 2385223 A
Images(3)
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Description  (OCR text may contain errors)

P 1945- J. R. MOORE 2,335,223

CLOTHES DRYING MACHINE Filed Oct. 21, 1938 3 Sheets-Sheetl 11v VEN TOR. MMES A. M9025 W Z A TTORNEY Sept, 18, 1945. J. R. MOORE CLOTHES DRYING MACHINE Filed Oct. 21, 1938 3 Sheets-Sheet 2 INVENTOR.

JAM/5 1?. M49?! BY 2 ATTORNEY Sept. 18, 1945. J. R. MOORE 3 CLOTHES DRYING MACHINE Filed Oct. 21, 1938 I5 Sheets-Sheet 3 INV EN TOR. .544!!! f. 1/00 9 #W ATTORNEY Patented Sept. 18, 1945 CLOTHES-DRYIN G MACHINE James R. Moore, Minneapolis, Minn., as'signor, by mesne assignments, to Stanley G. Harwood,

Minneapolis, Minn.

Application October 21, 1938, Serial No. 236,189

6 Claims.

This application is a continuation in part of my pending application Serial No. 177,123, for Clothes drying machine, filed November 29, 1937.

The present invention has relation generally to equipment for drying articles or material, and, in the disclosure as made, relates to a machine designed to be more especially useful to the purpose of causing clothes or other fabric articles or material to be dried.

An object of the invention is to provide a machine or equipment for drying clothes or other articles or material which will be adapted to production of maximum drying action upon the clothes, articles or material to be dried by expenditure of minimum in heat energy.

A further object is to provide a machine or equipment of the present character which will include a drying chamber adapted to receive wet, damp or moist clothes or other articles or material to be dried, means for heating said drying chamber, and a construction and arrangement through the instrumentality of which substantially all heat applied to said drying chamber by said means can be effectively utilized to the accomplishment of drying action upon clothes, articles or material placed in said drying chamber.

A further object is to provide a machine or e uipment for drying clothes or other articles or material which in its entirety will be of novel and improved construction.

And a further objectis to provide a machine or equipment of the present nature wherein will be incorporated various improved features and characteristics of construction novel both as individual entities of saidmachine orequipment and in combination with each other.

It is also an object to provide a novel method of drying laundry.

With the above objects in view, the invention comprises the construction, arrangement and combination of parts as now to be fully described and as hereinafter to be specifically claimed, it being understood that the disclosure herein is merely illustrative and intended in no way in a limiting sense, changes in details of construction and arrangement of parts being permissible so long as within the spirit of the invention and the scopeof the claims which follow.

In the accompanying drawings forming a part of this specification,

Fig. 1 is a front perspective view of a clothes drying machine including the features and characteristics of the invention;

Fig. 2 is a side elevational view of the clothes drying machine as it would appear from the left side of Fig. 1;

Fig. 3 is a plan view, on a reduced scale, of the clothes drying machine of Fig. 1;

Fig. 4 is an enlarged vertical central transverse sectional view, taken on line 44 in Fig. 3;

Fig. 4a is a detail sectional view of the mounting for the article supporting device or drum of the machine;

Fig. 4b is a detail sectional view of a door of the clothes drying machine for allowing access to the article supporting device or drum of said machine;

Fig. 5 is a vertical central longitudinal sectional view, taken on line 5-5 in Fig. 3;

Fig. 6 is a horizontal sectional view, taken as on line 6-6 in Fig.5;

Fig. 7 is an enlarged fragmentary sectional view, partially broken away, taken on line 1-1 in Fig. 2;

Fig. 8 is an enlarged plan view detailing power transmitting mechanism of the machine;

Fig. 9 is an edge view of the disclosure of Fig. 8; and

Fig. 10 is a fragmentary sectional view, corresponding generally with the disclosure of Fig. 5, illustrating a clothes drying machine of slightly modified construction made according to the invention.

The clothes drying machine in the disclosed embodiment of the invention is externally of generally rectilinear conformation and internally of generally cylindrical conformation. More explicitly, an inner cylindrical housing l5 of the machine is provided in spaced relation to outer upper, front and side or end walls, denoted l6, ll, l8 and I9, respectively, thereof, and insulating material 20 is suitably disposed between said housing [5 and said walls l6, l1, l8 and I9. The housing I 5 and the walls l6, l1, l8 and I9 desirably may be composed of sheet metal. A removable metal cover 2| is arranged over an opening in the upper wall I6. The insulating material 20 may be of any composition suitable to its purpose. A rearward wall 22 of the machine may be of any suitable material. As disclosed, the major portion of the rearward wall 22 is composed of asbestos. The front end wall 23 of the cylindrical housing [5 is'in contiguou relation with insulating material 20 and the rear end wall 24 of said housing I5 is in contiguous relation with the rearward wall 22. In use, the clothes drying machine may rest upon any suitable supporting surface therefor, as, for example, the floor of a laundry or basement.

The cylindrical housing l5 communicates through a. passageway 25 at its lower portion with an outlet passageway 26 below said housing l5 and leading to an outlet 21 from the clothes drying machine at a lower portion of the side or end wall l8 thereof. The passageway 25 is coextensive in width with the housing l5, and the outlet passageway 26 is coextensive in width with said passageway 25. A horizontal wall 28 constitutes the lower wall of the outlet passageway 26, as well as the lower wall of the machine. A horizontal wall 29 parallel with, in spaced relation to and above the wall 28 constitutes the upper wall of said outlet passageway 26. Said wall 28 meets the front end wall 23, extends past the rear end wall 24, and meets the side or end Walls I8 and IQ of the machine. Said wall 29 meets the front end wall 23, rear end wall 24, and the side or end wall l8. The edge of the wall 29 opposite said wall l8 meets a lower portion of the cylindrical housing |5 at the adjacent side of the passageway 25. The side of said passageway 25 opposite the horizontal wall 29 is defined by a vertical wall 38 which extends downwardly from the housing I5. The vertical wall 38 is disposed transversely of the clothes drying machine and extends between the front end wall 23 and the rear end wall 24 of said housing I5. The lower edge of said vertical wall3ll meets thewall 28.

Air is adapted to travel downwardly from the interior of the housing |5 through the passageway 25 and the outlet passageway 26 to and out of the outlet 21. A fan or blower 3| is disposed within the machine at the side of the vertical wall 36 opposite the outlet passageway 26. A casing for the fan or blower 3| is denoted 32. An inlet is provided for admitting air to the fan or blower casing 32, and an exhaust 33 from said casing extends through an opening 34 in the vertical wall 30. The exhaust 33 terminates in the outlet passageway 26 at location beneath and centrally of the passageway 25 and is as disclosed situated between the front and rear walls 23 and 24, in spaced relation to each of said front and rear walls and in alinement with the outlet 21.

The fan or blower 3| forces air out of the exhaust 33, past the central portion of the passageway 25, through the outlet passageway 26, and from the macine out of the outlet 21.

Said fan or blower 3| is fixed upon a horizontal shaft 35 driven by an electric motor 36 suitably mounted upon the lower wall 28 and situated within the machine. The motor shaft 35 includes a portion thereof extending in direction from the motor 36 opposite the fan or blower which fixedly carries a drive pulley 31.

Save for the passageway 25 leading from the interior of the cylindrical housing l5 at the lower portion thereof into the outlet passageway 26 said housing is adapted to be completely closed when the machine is in operation.

As illustrated, the front wall I! andthe front end wall 23 of the machine include a substantially centrally situated opening 38, circular as shown, and said openin 38 is adapted to be covered by a circular door 39 which is rotatably supported, as at 40, upon the front walls l1 and 23. The door 39 when open allows access to an article supporting device or drum 4|, presently to be described, of the machine. Said article supporting device or drum 4| is within the cylindrical housing l5 and said housing constitutes a drying chamber 42 of the machine about the article supporting device or drum. The door 39 is of course closed during operation of the is situated in back of a flange 43 upon the interior surface of the front end wall 23, and when the door is open it is situated within the chamber 42 above the opening 38, about as disclosed in dotted lines in Fig. 1. A manually manipulable handle 44 is for the purpose of opening and closing said door 38.

An upper portion of the cylindrical housing l5 includes an ofi-set or recess 45 in which a heating element'46 is situated. The heating element 46 shown in Fig. 5 is an electrical resistance element adapted to be energized from any suitable source (not shown). While the heating element 46 may be located anywhere within the chamber, it is preferably placed at or near the top, since if located near the bottom, the articles being dried might be scorched, should the motor drive for the drum be accidentally disabled.

In Fig. 10 the upper portion of the housing I5 is regular, or continuously curved, and a gas burning chamber 41 is disposed within the machine and above said housing l5. A gas line 48 leads into the chamber 41, and an exhaust outlet 49 leads from said chamber. Save for the different types of heating elements or members employed, the disclosures of Figs. 5 and 10 are substantially similar. Heaters of types other than as disclosed may of course :be utilized.

The article supporting device or drum 4| is adapted to receive articles or material of any nature, such as clothes, or other fabric articles, or, in fact, any articles or material, to be dried, the articles or material being placed in said article supporting device or drum 4| through the opening 38 while the door 38 is open.

Means is provided for mounting the article supporting device or drum 4| in the drying chamber 42 so that said device or drum can be rotated in said drying chamber while the latter is being heated by the heating element or member of the machine. The heat applied by the heating element or member of course provides the desired vaporizing action upon moisture in the clothes, articles or material which are being dried.

The article supporting device or drum 4| includes a forward circular sheet metal end wall 50, a rearward circular sheet metal end wall 5|, and a cylindrical perforate or screen member 52. The forward end wall 50 includes a central circular opening 53 which alines with the opening 38. Each of the end walls 50 and 5| includes an outwardly extending marginal flange, denoted 54 and 55, respectively, and the opposite side edge portions or margins of the perforate or screen member 52 overlap said flanges 54 and 55 and are suitably and conveniently secured thereto. The rearward end wall 5| includes a central circular opening 56 which receives a substantially cylindrical portion of a spider 51 in such manner that said cylindrical portion is situated within the article supporting device or drum 4|, beneath a substantially conical cover member 58 for the cylindrical portion of the spider suitably and conveniently secured to and against the inner surface of said rearward end wall 5|, as at 59. Legs 60 of the spider 51 are positioned in contiguous relation with the outer surface of the rearward end wall 5|. As shown, said spider has three legs 60 spaced at degrees apart. A metal strap extends radially from each leg 66 and is disposed in contiguous relation with said rearward end wall 5|. The inner end of each metal strap 6| is secured to the rearward end wall 5| by a bolt, rivet or fastener 62 which also secures the corresponding leg 60 to said rearward end wall. A plurality of tumbler members or ribs 63 extend transversely of the article supporting device or drum 4| between the forward and rearward end walls 58 and 5| thereof. As shown, there are three tumbler members or ribs 63, one corresponding to each metal strap GI, and each tumbler member or rib is approximately V-shapein cross-section. That is, each member or rib 63 includes an outer base 84 at the inner side of the perforate or screen member 52 secured to said perforate or screen member by rivets 65 which also secure a retaining member 68 for the tumbler member or rib against the perforate or screen member at the outer side thereof. The retaining members 66 as shown extend the full ,width of the article supporting device or drum 4|. Each tumbler member or rib 63 includes an inner base 61 and divergent side walls 68 connecting said bases 64 and 81. Cross rods 69 extend between the end walls 58 and 5|, including a cross rod 69 at the inner side of each tumbler member or rib 63 in adjacent relation with or contiguous relation with the inner base 61 of the corresponding tumbler member or rib, The opposite end portions of each cross rod 69 are mounted in and extend outwardly beyond the forward and rearward end walls 58 and 5|, respectively, of the article supporting device or drum. The forward end of each cross rod 69 threadably receives a nut 18 which is drawn up against said forward end wall 50. The rearward end portion of each cross rod 69 is arranged in the outer end portion of a corresponding metal strap 6| at the rear side of the rearward end wall 5|, and the rearward end of each cross rod threadably receives a nut 1| which is drawn up against said corresponding metal strap 6|, Obviously, the cross rods 69 and the nuts 10 and 1| cooperate with the transverse members or ribs 63 and the retaining members 66 to maintain the walls 50 and 5| in fixed, spaced apart relation, cooperate with the rearward end wall 5| to rigidly secure the outer ends of the metal straps 6| to said rearward end wall, and cooperate with the forward end wall 58 and the rearward end wall 5| to fix the positions of the transverse members or ribs 63 within the article supporting device or drum 4| and relatively to the perforate or screen member 52.

A mounting for the article supporting device or drum 4| includes the substantially cylindrical part of the spider 51. A horizontal hollow bearing 12 is supported, as at 13, in the rear end wall 24 and the rearward wall 22 and extends inwardly beyond and outwardly beyond said walls 24 and 22, respectively. The inner portion of the hollow bearing 12 is disposed within the cylindrical part of the spider 51 between its legs 68, and the inner end of said bearing 12 is as shown in proximate relation to the inner end of said cylindrical part of said spider. The horizontal bearing 12 supportsa bushing 14 in the outer portion thereof and a bushing 15 in the inner portion thereof. A horizontal stud shaft 16 is suitably and conveniently mounted in the bushings I4 and 15 to extend beyond both the inner and outer ends of the hollow bearings 12. The inner end portion of the stud shaft 16 snugly enters an opening 11 in the cylindrical part of the spider 51 and perpendicular to the plane of the rearward end wall 5|, and a cross pin 18 is arranged in said cylindrical part of said spider and extends tlirough the stud shaft to fixedly secure the spider upon the irmer end portion of the stud shaft. The

outer end portion of said stud shaft 16 fixedly carries a drive pulley 1.9 arranged in proximate relation to or contiguous relation with the outer end of the hollow bearing 12.

The construction includes mechanism for transmitting power from the motor shaft 35 and its drive pulley 31. As shown, said power transmitting mechanism is situated within a space 89 of the machine between the rearward wall 22 and an outer vertical closure wall 8| at the rear of said rearward wall 22 and in spaced relation thereto. The rearward edges of the side or end walls I8 and I9 meet the closure wall 8| to close the space 88 at the rear of the machine, and said space 88 is open at location above and adjacent to vertical wall 30 to the space of the machine which houses the electric motor 36.

An idler unit of the power transmitting mechanism includes a relatively large pulley 82 and a considerably smaller pulley 83. The large pulley 82 and the small pulley 83 constitute a single rigid structure rotatably mounted upon a post 84. A belt 85 rides upon the pulleys 31 and 82 and a belt 86 rides upon the pulleys 19 and 83.

To equalize belt tension between the two belts 85 and 86 and to provide for belt adjustment to take up slack, the post 84 which carries the pulley unit 82, 83 is fixed in a bar 81 of an extensible lever including a second bar 88. The bar 81 is slidably secured to the bar 88 by means of a headed and nutted bolt 89 which passes through said bar 88 and through an elongated slot 90 in the bar 81. The headed and nutted bolt 89 is mounted or supported in a member 9| itself suitably and conveniently fixed to the rearward wall 22 of the machine. Evidently, the bolt 89 oscillatably supports the extensible lever consisting of the two bars 81 and 88 upon the rearward wall 22. Said bars 81 and 88 may be retained in alining relation with each other through the instrumentality of a flange 92 upon one end of the bar 88 arranged in a longitudinal end slot 93 in the bar 81. As disclosed, the post 84 is situated upon the bar 81 at location between the longitudinal end slot 93 and the headed and nut ted bolt 89 and extends away from the surface of said bar 81 which is opposite the bar 88. A flange 94 upon the end of the bar 88 opposite the end of said bar having the flange 92 is disposed in spaced relation to the bolt 89 at the side thereof opposite the post 84 and in alining relation with said post, and a coil spring 95 secured to the adjacent end portion of the bar 81, as at 96, and to the flange 94, as at 91, resiliently urges said bar 81 toward said flange 84 and away'from the pulleys 31 and 19 and thus resiliently urges the pulley unit 82, 83 in direction to preclude the possibility of slack in each of the belts 85 and 86. The arrangement is such that the tension upon said belts 85 and 86 is equalized, the extensible lever 81, 88 oscillating or moving to position compatible with equalization of belt tension upon the diiferent belts 85 and 86. Stated differently, the pulley unit 82, 83 is free to adjust itself in response to belt tension so that the tension upon the belt 85 will counteract the tension upon the belt 86, and vice versa.

A hereinbefore stated, clothes or other articles or material to be dried are placed in the article supporting device or drum 4| through the openings 38 and 53, and when a desired quantity of clothes or articles or material has been inserted into said article supporting device or drum, the door 39 is closed. The heating element or member, as in Fig. 5, or as in Fig. 10, is of course made operative to impart heat to the drying chamber 42. Upon energization of the electric motor 36 the shaft 35 is rotated to actuate the fan or blower 3| and to also drive or rotate the article supporting device or drum 4| through the instrumentality of the transmission as illustrated and described. The fan or blower 3| creates flow of air through the outlet passageway 25, past the passageway 25, and from the outlet 21.

The heating element, member or unit employed operates to raise the temperature within the drying chamber 42, as Well as within the article supporting device or drum 4 I, so that moisture laden articles to be dried become heated. Thus, the moisture is converted into steam and/or hot vapor which tend to be removed from the articles.

Rotation of the article supportin device or drum 4| results in a tumbling action upon the clothes or articles, due to the action of the tumbler members or ribs 63 which function to lift and drop the clothes or articles as said article supporting device or drum rotates. The tumbling action assists the drying effect, and said tumbler members or ribs 53 obviously function or operate to produce a tendency toward a general spreading out of the clothes or articles in the supportin device or drum 4| so that said clothes or articles readily will be dried.

Because of the fact that the atmosphere within the chamber is stirred by the rotation of the drum, the opening 25 may, of course, be placed at any point in the periphery of the chamber. However, since the heater is preferably located at the top, it is better from a practical standpoint to locate the opening 25 generally opposite the heater. Moreover, from a manufacturingstandpoint, it is preferable to locate the evacuation mechanism in the lower part of the structure and consequently to place the opening 25 at the bottom.

Because of the fact that the heating element, member or unit is at or adjacent an upper portion of the drying chamber, air at higher location or elevation in said dryin chamber would tend to have a temperature greater than that of air at lower location or elevation in the drying chamber. However, because of the stirring action of the drum and the articles therein, there is a definite tendency to difiuse the heat generated and thereby equalize the air temperature in all parts of the chamber.

In any construction and arrangement including the principles of the invention, moister air is adapted to be removed from said drying chamber by way of a passageway, such as 25, or equivalent, through the instrumentality of mechanically or artificially produced air currents, and air from the outside of the machine is adapted to enter said drying chamber through said passageway in replacement of the moister air. That is, moister air which is removed from the drying chamber is replaced as it is removed by drier air entering through the opening 25 of said drying chamber into the interior thereof.

Were the moister air not removed in some manner or other from the drying chamber, and from the passageway adjacent the opening 25 of said drying chamber in the disclosed embodiment of the invention, after said moister air had become saturated to be non-useful to the advancement of the dryin operation, saturated, non-drying air would build up in the drying chamber and cause the drying action to be retarded. Desirably. air which has become saturated and nondrying constantly and continuously is removed from location where it possibly can cause accumulation of moister air within the drying chamber by provision of constant and continuous flow of a current of air, which aptly is termed a carrier current of air, past the opening of said drying chamber.

The construction and arrangement preferably will be such that only saturated air which no longer is able effectively to further the drying operation will move to and through the opening 25. Thus, substantially all heat applied in said drying chamber effectually will be utilized to the accomplishment of drying action upon clothes, articles or material placed in the drying chamber to be dried, and saturated air removed from said drying chamber will cause no noticeable increase in temperature of atmosphere surrounding the drying chamber When the drying machine herein specifically illustrated and described is in operation, saturated air constantly and continuously is removed from the drying chamber 42 with a slow and gentle flow through the passageway 25 into the outlet passageway 26 containing air constituted as a carrier current of air constantly and continuously caused to travel through said outlet passageway 26 by operation of the fan or blower 3|.

. Said carrier current of air constantly and continuously by an aspirating action removes the saturated air which is drawn into the outlet passageway 26 from the central portion of said outlet passageway 25 and from the drying machine. and air from the carrier current of air constantly and continuously travels from the outlet passageway 26 through the passageway 25, the end portions of which permit such inflow. into said drying chamber and replaces the saturated air as this becomes removed from said drying chamber.

What is claimed is:

1. A laundry drier comprising, in combination, a chamber to receive the laundry and having an opening but otherwise closed, means for directly applying heat to the contents of the chamber,

means for agitating the laundry during the course of drying, and means for producing a current of air flowing across said opening exteriorly of the chamber to force relatively dry unheated air into the chamber and to carry away moisture laden air from the chamber as it is replaced by said relatively dry air.

2. A laundry drier comprising, in combination, a chamber to receive the laundry and having an opening but otherwise closed, means within the chamber for generating heat, means for agitating the laundry during the course of drying, and

, means for producing a current of air and having an outlet directing said air transversely across said opening exteriorly of the chamber to draw moisture laden air from said chamber and to supply relatively dry air thereto.

3. A laundry drier comprising, in combination, a chamber to receive the laundry and having an opening but otherwise closed, means for applying heat directly to the contents of the chamber, means for agitating the laundry in the chamber during the course of drying, and means for drawing moisture laden air from the chamber through one part of said opening and to supply relatively dry air to the chamber through another part of said opening.

4. A laundry drier comprising, in combination, a chamber to receive the laundry, means within the chamber for tumbling the laundry therein, means for applying heat directly to the laundry as it is being tumbled, said chamber being provided with an opening but being otherwise closed, and means for producing a current of air and having an outlet directing said air across a part of said opening to draw moisture laden air from said chamber and to permit relatively dry air being taken in through another part of said opening to supplant the air removed.

5. A laundry drier comprising, in combination, a chamber to receive the laundry and having an opening but otherwise closed, means within the chamber for generating heat, means for agitating the laundry during the course of drying, and means for producing a current of air and having an outlet directing said air across the central portion of said opening to draw moisture laden air from said chamber through said central portion leaving the end portions of said opening free to permit the inflow into the chamber of relatively dry air to supplant the moisture laden air withdrawn through said central portion.

6. A laundry drier comprising, in combination,

a chamber to receive the laundry to be dried and having an opening in the bottom thereof but otherwise closed, means within the chamber for tumbling the laundry therein, means for supplying heat directly to the laundry as it is being tumbled, and means for directing a current of air transversely across the central portion of said opening whereby moisture laden air will be withdrawn from the chamberthrough said central portion, the end portions of said opening being free to provide for ingress of air to supplant the air removed.

JAMES R. MOORE.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2460422 *Jul 28, 1945Feb 1, 1949Smith Corp A OClothes drier
US2486315 *Dec 30, 1947Oct 25, 1949Westinghouse Electric CorpDrying apparatus
US2540955 *Sep 19, 1945Feb 6, 1951Hamilton Mfg CoLaundry drier
US2550118 *Jul 31, 1944Apr 24, 1951Lovell Mfg CoClothes drier
US2564132 *Sep 24, 1949Aug 14, 1951Jack & Heintz IncAutomatic tensioning device
US2633646 *Jul 6, 1950Apr 7, 1953Maytag CoMethod and means of drying clothes
US2645035 *Feb 28, 1949Jul 14, 1953Machf Reineveld N VDrying apparatus for laundry work
US2707837 *Feb 3, 1951May 10, 1955Gen ElectricClothes drier
US2780008 *Sep 25, 1953Feb 5, 1957Gen Motors CorpDomestic appliance
US2820623 *Apr 20, 1956Jan 21, 1958White Sewing Machine CorpClothes drier
US2855698 *Feb 27, 1957Oct 14, 1958Easy Washing Machine Company LClothes drier drums
US2927379 *Jul 26, 1957Mar 8, 1960David TannDrying drum with absorbent wall
US3512268 *May 3, 1968May 19, 1970Miller Laundry Machinery CoCommercial laundry dryer
US7627960 *Jun 30, 2003Dec 8, 2009General Electric CompanyClothes dryer drum projections
US7661203 *Jun 20, 2007Feb 16, 2010Candy S.P.A.Basket for washing machine, washer-dryer, and the like
US7992321 *Dec 19, 2007Aug 9, 2011Electrolux Home ProductsLaundry dryer having three roller drum support system and reversing idler assembly
US8046933 *Oct 1, 2007Nov 1, 2011Lg Electronics Inc.Apparatus for detecting a belt-cutoff of dryer and method for detecting the same
Classifications
U.S. Classification34/599
International ClassificationD06F58/02
Cooperative ClassificationD06F58/02
European ClassificationD06F58/02