US 2637410 A
Description (OCR text may contain errors)
May 5, 1953 F. A. MARTIN ETAL 2,637,410
FILTER STRUCTURE FOR sucwxon CLEANING APPARATUS Filed April 25, 1951 2 SHEETS--SHEET 1 FlG.l
INVENTORS. FRANK A. MARTIN BY M LVIN H. RIPPLE ATT'Y y 5, 3 I F. A. MARTIN ETI'AL 2,637,410
FILTER STRUCTURE FOR SUCTION CLEANING APPARATUS Filed April 25, 1951 2 SHEETS-SHEET 2 INVENTORS: FRANK A. MARTIN ELVIN H. RIPPLE ATT'Y Patented May 5, 1953 iCiEi FILTER; STRUGTURE FORrSUCTIlDN CLEANING APPARATUS liFrank AflMartin, Akron, and' Melvin'H. Ripple,
Canton; Ohio," ass ignors to The lloover' (Jonip-any, North Ganton, Ghio, a. -.corporation@;of
ApplicationAmtil. 25,. 1951, SerialNo. 222,734
7 Glaims. (Cl. 183 -el) The present invention r'elates "to filterr structures for use with suction. cleaning apparatuses and in.particular to an arrangement permitting the end of the filter not normally attachedrtothe suction cleaner exhaust outlet to be simply and efiectively sealed during use of the filter with the cleaner and to open automatically to its maximum extent when removedirom the. cleane to empty the filter, of accumulated dirt.
It is aparticular object of, our invention to provide .a suctionoleaner filter sack having emptyingenden'closing a resilient liner member which. is normally hiasedlto open the mouth oi thejfilter. to substantially its. maximum extent but whichpositions the partswhen. so opened to fold automaticallyinto aflat structure by thev application. 01a light isidewise pressure thereto for reassembly Withthe cleaner.
.Itis a. further. .objectof the present invention to provide. a suction cleaner. filter each having". a i molded. plastic insert lther'ein molded: to provide two vcomparatively.rigid side rail members connected byanair. of leaf members hingedLto the side rails and. each other by. integral hinges. arrangedito anglethe hinge leaves inwardly to-' ward each other when unstressed so that .sidewise pressure applied to the rail-members.causes the hinge leaf members automatically to fold in- Wardlyuintoproper. position. for assemblyof the cleaner mouth in a mounting clip.
'It is .a. further object of thepresentinvention ot provide an elastic. material insert for. a suction cleaner bag mouth having an integral hinge construction vlzhichibiases the insert .to a predetermined; open; emptying position but which. readily folds: into aflatcondition without imposing excessivestresses upon tie elastic material and without crushing. the...fi1ter. material.
Otherobiects, and..adv.an.tages of the. invention will become I apparent as. the. description proceeds when taken .in. connection. with the. accompanying drawing. in which:
Figure. l is aplan view of -aplastic. insertimeinher for a suction cleaner andifilter bag;
Figure 2 is a broken view illustrating. the. device of Figure l the flat folded. condition;
Figures is. a perspective vievvoithe, enml ying end. of a suction. cleanerfilter sack-embodyin the present invention and. positioned, in. the... emptying condition. thereof Figure 4 is a. sectionalovieww taken. alongthe line 4-4 of. Figure 5;.illustrating .the.,.roanner in which the ioldedendof; the bag, is secured-in the mounting clip; and
Figure 5 is a broken view illustrating a suction cleaner filter embodying invention andattachedto amounting clip.
Referring now to the drawing indetailand first'to' Figure 1 thereof, there is 'i-l'lustrateda'suo tioncleaner-filter mouth'iramel made of anelastomeric meter 1. Preferably the frame l is maolded in a go. rally rectangular-shape of suitable plastic such 1.03"PG1Y811'11Y1BI18. The frame 1 comprises opposed side rails 2;; and 3 connected to each other at their left handends,-as viewed-in Figure .1,- by a pair oi-hinge leaves land: i -and atitheir righthandends byasecondpair-of hingc leaves and l. The-hingeleaves l and 5'are hinged together by means of an elongated-"fiat hinge section ll atthe center of the frame i.
Similarlythe hinge leavesf 5- "l are'joined-hy another hinge section 8. ""The-side-rails-2and 3 are joined to the hinge leaves lfltol inclusive at the corners of thegframe-by: elongated fiat-hi-nge sections 9. The sections llyandfl havea-smaller cross section and are I101,flE3Xlbl(-Y than thehinge leaves. and side rails; hence the hinging action always occurs at the sections-8 and fi. "Thefiat hingesections't'are so connected to the hinge leaf portionsof the frame that theyiorm s1nooth=continuations ofzthe inside-surfaces of the hinge leaves and present outwardly facin indentation ill. The hinge sections 9" so connected to the hinge leaves tol inclusive; that they form a continuation oi the outside surface of the hinge leaves and an inwardly facing indentation l l with the inner surfaces of the'h-ingeyleaves andside rails. The siderails are designed to be mo-rerig'id than the hinge leaves lto i and are tl'rereioremade .The, angular relationship is-not-criticaland the internal angle betweenthe siderails --and the hinge. leaves may lee-fromseventy-toeighty-five degrees, for example. *Eaclrof the side-rails at its. center portion is; provided 'with an inwardly directed .nib ii for apurpose to-he described-"hereinaiter. The external; s-urfaceflof the rail 2 opposite thenio'l his provided with-an elongated indentation .l tto accommodate a bag seam 'to'be described hereinafter.
Itisapparent fromfiigure l that a light-pressure applied to "theside--rai1s2and 3-tending" to 3 push the same towards each other will cause the frame I to fold into the flat condition illustrated in Figure 2.
When the frame is folded, the elongated fiat and narrow hinge sections 8 and 9 assume a substantially circular shape as shown in Figure 2 to provide substantially circular openings at the junction point between each pair of hinge leaves and the junction point between each hinge leaf and side rail. As a result of this, the hinge sections of the plastic frame assume an arcuate relationship in which they are stressed about an arc which is within the elastic limits of the par ticular material. For example, using polyethylene, the radius of the internal are at the folded hinges may be as small as one-twentieth of an inch. The openings thus formed also provide space for filter material as Will be apparent as the description proceeds. In the folded condition of the frame, the projecting nibs I extend into the space between the now juxtaposed hinge sections 8 to aid in forming a seal at this point.
Each of the sections of the frame I is rectangular in cross-section with the long dimension of the rectangle at right angles to the plane of Figure 1. Cross-sections of portions of the frame are shown in Figure 4. In the folded condition of the frame, the hinge leaves 4 and 5 are juxtaposed and in parallel relation to each other and to the side rails 2 and 3. Similarly, the hinge leaves 6 and I are juxtaposed in parallel relationship to each other, to the side rails 2 and 3 and are aligned with the hinge leaves 4 and 5. The stresses in the hinge sections 8 and 9, when the frame is in the folded condition of Figure 2, naturally tend to spring the frame to the open, unstressed condition illustrated in Figure l, which is the shape in which the same is originally molded. If the leaves are moved closer to a right angular relationship with the side rails, that is, away from each other from the position illustrated in Figure 1, the stress in the hinges 8 and 9 tends to return the frame to the condition illustrated in Figure 1. A small space has been shown between each juxtaposed portion of the frame in folded condition in Figure 2 to illustrate the space taken up by enclosing filter fabric as will be apparent from Figures 3 and 4.
Figure 3 illustrates the open end of a suction cleaner filter 20 incorporating the frame I and in its relaxed or emptying condition. The frame I is not visible in Figure 3 as it is covered by the material of the filter 20. The reference characters applied to the frame side rails and hinge leaves in Figure 1 are applied to the corresponding parts in Figure 3 in order to locate the frame with reference to the filter 20. Th material of the filter 20 is formed in tubular shape with the edges overlapping to form a seam indicated at 2| which is secured by stitching 22 to form a tubular body. The tubular filter 20 thus formed is preferably turned inside out as is the frame I. The tubular body is then telescoped through the frame and the free end turned down around the frame to cover the same and then stitched to the body of the bag by stitching indicated at 23. The filter 20 and now in-sewn frame is then turned right side out to produce the structure indicated in Figure 3 with the inturned flap 24 of the filter stitched to the body of the filter on the inside thereof. The filter then presents a tailored external appearance and the tubular body 20 is substantially fiush with the outside surfaces of the internal frame I. The seam 2I-22 of the filter 20 is aligned with the inden- 4 tation I6 in the side rail 2 so that the double thickness of material lies in the indentation, and a smooth continuous external surface is provided at the top of the assembled filter at this point.
When the assembled filter is collapsed to bring the top frame member into the condition illustrated in Figure 2, the double thickness of filter material positioned between each juxtaposed hinge leaf pair and hinge leaf side rail pair forms a seal which prevents the escape of dirt and air through the filter mouth. The folding operation causes the material on the inside of the filter to bunch or gather at the hinges. The gathered material fills and seals the circular openings formed at the hinge points when the frame is in folded condition and also provides a shaping form for the hinge sections barring the formation of sharp bends therein. The nibs I5 on the side rails project into and seal the space left between the hinges 8 when the frame is folded. The present construction provides a completely sealed filter mouth which avoids crushing or biting of the filter material and which has no relatively movable mechanical parts positioned internally of the filter material.
The collapsed emptying end of the filter may be slid sideways into a U-shaped sealing and supporting clamp 26 of spring material shown in Figures 4 and 5. The clamp 26 has converging bottom wings 21 which press the material of the filter together below the portion thereof encasing the frame I to form a neat finished appearance and to insure an air and dirt seal at the mouth portion of the filter 20. The space beneath the frame I at the apex of the angularly positioned wings 21 forms ample space for accommodating the various flap portions 24 of the filter material which are turned over the frame I and are stitched back to the filter to trap the frame. The spring clip 25 forms a moderately tight fit with the frame encasing portion of the filter so as to press the same tightly together to form a complete air and dirt seal. therebetween.
The lower portion of the filter is necked in as indicated in Figure 5 and is secured to a clamping ring 28 of any desired type which will be utilized for the purpose of securing the lower end of the filter 20 to the exhaust outlet of a suction cleaner. The spring clip 26 is provided with a bail section 3I at its top to which a suitable support, such as a tape or spring, may be attached for mounting the upper end of the filter from a suction cleaner propelling handle in a known manner.
Our invention provides a filter in which the 'upper or emptying mouth thereof automatically opens substantially to the full extent provided by the filter fabric with the hinge leaves angled slightly inwardly to ensure proper folding in response to a light pressure on the side rails of the frame. The frame seals completely without crushing the filter fabric or catching the same in mechanical devices, and the filter fabric gathered at the hinges provides a proper radius of curvature for the hinge straps.
1. A folding frame for filter sack mouths cornbiased to move said principal members apart until each of said leaves assumes a position forming an internal angle less than a right angle with the principal member to which it is directly connected whereby pressure applied to the outside of said principal members will move said members together folding said leaf members together between said principal members.
2. A filter comprising a tubular body of filtering material having an open mouth portion, a frame secured to the open mouth portion of said filter body comprising a one piece body of plastic material having a pair of opposed side frame sections, a thin section elongated fiat hinge portion joined to each end of each of said side frame sections, a hinge leaf member joined to each of said hinge portions, and a thin section elongated flat hinge portion joining each pair of hinge leaf members joined to corresponding ends of said side members.
3. Apparatus according to claim 2 in which the filter material defining the open mouth portion of said tubular body is turned over said frame to enclose and conceal the same, and said flat hinge portions are offset from the faces of said side frames and hinge leaf members to define substantially circular openings accommodating gathered filter material when said frame is folded with said hinge leaf members folded between said side frames.
4. A device of the character described comprising a frame of elastomeric material composed of a pair of opposed side rails, a pair of opposed folding members each comprising a pair of hinge leaves joined by a hinge, and hinges joining the ends of said folding members to the ends of said side rails to form a polygonal frame in which said hinges comprise elongated flexible sections of said frame having a lesser cross-section than said side rails and hinge leaves, the hinges joining said side rails to said folding members are offset outwardly from the inner faces thereof, and the hinges joining the hinge leaves of said folding members are offset inwardly from the outer faces thereof whereby members joined by a hinge member, hinge memsaid hinge members have a smaller cross-section said hinges assume an arcuate form around substantially circular openings when said frame is collapsed with the hinge leaves of each of said folding members lying between said side rails in substantially parallel relation to each other and to said side rails.
5. Apparatus according to claim 4 including a tubular filter body having an open end portion turned back upon itself around said frame to enclose the same in said filter body.
6. A filter mouth frame comprising a onepiece body of elastomeric material including, a pair of opposed rail members, a pair of opposed folding members each comprising a pair of leaf bers joining the ends of each of said folding members to corresponding ends of said rail members, and said hinge members being formed t bias said frame to an open position in which sai rail members are spaced apart and each of sai leaf members is spaced from and forms an internal angle less than a right angle with the rail member to which it is directly hinged. 1 '7. Apparatus according to claim 6 in whic than said leaf members and said rail members the hinge members joining a principa1 membe to a leaf member are offset outwardly of th inner faces thereof, and the hinge members joining the leaf members forming said folding members are offset inwardly from the outer face thereof.
FRANK A. MARTIN.
MELVIN H. RIPPLE.
References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,513,395 Holmes Oct. 28, 192 1,753,458 Willis Apr. 8, 193 1,787,224 White Dec. 30, 193 2,364,069 Hahn Dec. 5, 194 2,503,918' Osborn Apr. 11, 195