|Publication number||US1448690 A|
|Publication date||Mar 13, 1923|
|Filing date||Feb 18, 1922|
|Priority date||Feb 18, 1922|
|Publication number||US 1448690 A, US 1448690A, US-A-1448690, US1448690 A, US1448690A|
|Inventors||Hetzer Anton, Paul C Hetzer|
|Original Assignee||Hetzer Anton, Paul C Hetzer|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (12), Classifications (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Mak. 13, 1923. 1,448,690 P. c. HETZER ET AL l VACUUM CUP Filed Feb. 18, 1922 Patented Mar. 13, 1923.
UNITED 1,44aa PntI-:lNTjolr'rlcls.A
.PAUL C. HE'IZER ANDANTN HETZ'ER, or CHICAGO, ILLINOIS.
Applicationk led February 18, 1922.. Serial'No. 537,416.
To all whom t may concern.'
Be it known that we,- PA,UI: G.Hni'nn and rlLN'roN l-lnrznn, both` citizens .of thev United States, and both residingat Chicago,
inthe county of Cook and State olf-Illinois,
v have invented certain` new and useful Improvements in Vacuum Cups, .ofwh-ich the following is a specification.'
This invention pertains to avacuum cupv designed primarily for use in the feeding of sheets of paper in a kprinting press, although the invention is applicable to other uses in which it is desired to employ suctionrfor the feeding of thin sheetsv of materials suchl as paper, cardboard or sheets offmetal which must be lifted successively from` a pile or stack and fed one at a time therefrom.yk ln the feeding of such thin sheets of materials, and especially the feeding of sheets ofpaper,`
ydifficulty has heretofore been experienced in:
' securing a uni-form and reliable suction by reason of inequalities in the stackingof paper, so that it is not alwayspossibleto advance the suction cup in perpendicular relation to thek surfacey of the sheet kto be acted upon7 which will occasionally present its surface in oblique relation to the cup. This is particularly true where the cups are designed to act upon. the sheets of paper or the like close to the edge of zthepile, which may be somewhat depressed as compared with the surface at `the center of thel pile'. Furthermore, difficulties are sometimesexperienced by reason of slight imperfectionsY in the rim of the cup which maybe worn or nicked, so that a perfect suction Will'notg be maintained, or possibly by irregularities Figure l is a side elevation ofthe cup and'y `mounting of the present invention;v
Fig. 2 is a sectional elevation ofthe same Fig. 3 is a top or plan view ofthe'mounting; and f Fig. 4 is a cross sectional elevation taken on the line 4 4 of Fig.r `2,. f
The cup l0 is formed offrubber orlike resilient material and is of widely' `flaring tion thereto.
bell shaped configuration provided around itsrixn with an annular,y flange or bead lf for initial contact with the sheet to be acted upon. At a point considerably within the interior vof the cup is an. inner annular flange or shoulder 12 which serves -to'i'nsure sec# ondaI-y contact with the' sheet, the surface of which will ordinarilybe drawn or suc'- tioned up into the interior of the cupto a slight degree after the initial contactis effected. The initial contactv also serves to spread or extend the rim of the cup so as tobringl the inner shoulder more closely to thevgenera-l surface of the pile of sheets be-y neath the cup.` c
, The4k cup at its upper end terminates in a 'flaring neck 13 which' enters the shouldered outer end 14 of a stemv l\5, and bears kagainst the tapered outer end of a clincher nipple 16,l
the. upper rimof' which bears against an annularlange 171, the parts being clamped and sealed by f the action of a jam nut 18 threaded into the shouldered outerend of the stein and having an inner reduced bead or ange 191 whichv engages the cupbehind the upper .fiaredj neck thereofl and forces;-
the sameclos'ely against the beveled end of the clincher nipple 16,'y y
rlhe stem l5 isprovidedY slightly below its extreme yupper end with an @outstanding flange 20 which on oppositesidesk ispro vided with semi-circular recesses 2l which slide upon the inwardly protrudingportions of` a pair of oppositelyk disposed guide pins: 22 which are housed within the kwalls of a centrally bored kcasing 23provided at its lower end with an inturned lip 24 through which the guide pinsare tightly entered, and which?l lip vfits snugly against' the outer surface of the stem 15. The lip provides a shoulder which carries a lower Washer 25`coacting with an upper washer 26,4 the upper washer being notched in alignment with the notches. or Cuts in the flanges to slide upon the guide pins in` closely sealed rela- The casing 23 is closed at its upper endsr by means of a: plug 27 which is` threaded into and vabuts against an upper annular shoulder 28, the plug terminating in a nipplev 29i threaded on its interior 30 and squared f on its outer surface 31 to receive a y'wrench or the like; The nipple is designed to be secured onto a pipe or tube which is'c'onnected witha vacuumA pumpr or the like, not ShWIl.' i f The plug has inwardly extending therefrom a tubular guide stem 32 which fits closely within the bore in the outer stem 15, and a coil spring 33 encircling the guide stem serves to exert a light spring pressure on the cup and associated parts permitting the same to yield, however, when any substantial pressure is encountered. The body of the casing is squared or angled on its extreme endat the point 34 to receive a wrench or the like which facilitates the adjusting creasing spring pressure on the paper surface, causing a flaring of the rubber cup until all portions thereof are brought into sealing contact with the paper surface, ir-
respective of irregularities therein. This sealing effect will be increased by the drawing of the paper surface within the cup until Contact isv effected with the inner bead or shoulder, so that a perfect seal will be effected, irrespective of irregularities in the stacking of the paper or from other causes.
The sealing arrangement provides an easy sliding fit between the outer stem and the guide stem, the guide pins serving to permit the reciprocation of the two members with respect to one another without permitting any relative rotation thereof. rIhe method of packing the sliding surfaces is one which affords a complete seal and at the same time permit easy reciprocation of the members with respect to one another, and the yielding of the spring enablesa seal to be effected under light contact, so that ordinarily sheets of freshly printed matter may be lifted and fed without smearing, which is of substantial importance in the art to which the present invention pertains.
1. In a pneumatic sealing device, the combination of a cup, an outer tubular stem which carries the cup, an inner tubular stem upon which the outer stem is slidably mounted, a spring bearing against the outer stem, a casing surrounding the inner stem and the upper portion of the outer stem, and coacting guide members on the casing and the outer stern for permitting recession of the outer `stem within the casing, substantially as described.
2. In a pneumatic sealing device, the combination of a cup, an outer tubular stein which carries the cup, an inner tubular stem upon which the outer stem is siidably mounted, a casing surrounding the inner stem and the upper portion of the outer stem, co-acting guide members on the casing and the outer stem for permitting recession of the outer stem within the casing, and a spring within the casing encircling the inner stem and bearing yagainst the outer stem, substantially as described.
3. In a pneumatic sealing device, the combination of a cup, an outer tubular stem which carries the cup, an inner tubular stein upon which kthe outer stem is slidably mounted, a spring bearing against the outer stem, a casing surrounding the inner stem and the upper portion of the outer stem, and guide pins carried by the casing and engaging the outer stem for permitting reciprocation thereof, substantially as described. p
4.' In a pneumatic sealing device, the combination of a cup, an outer tubular stem which carries the cup, an inner tubular stem upon which the outer stem is slidably mounted, a casing surrounding the inner stem and the upper portion of the outer stem, guide pins carried by the casing and engaging the outer stem for permitting reciprocation thereof, and a spring within the casing encircling the inner stem and bearing against the outer stem, substantiallyas described.
5. In a pneumatic sealing device, the combination of a cup, an outer stem to which the cup is secured, said stem being provided near its upper end with an annular flange, a casing provided at its lower end with an inturned lip snugly embracing the outer stem, a packing carried by said lip for sealing the outer stem within the casing, a pair of guide members caried by the casing and engaging the flange on the outer stem, a packing carried by said flange, a plug closing the upper end of the easing and provided with a depending inner stem telescoping into the outer stem, and a spring encircling the inner stem and bearing against the outer stem, substantially as described.
6. In a pneumatic sealing device, a flexible cup of bell shaped formation centrally perforated through its head and provided with a peripheral lip, and further provided at a point distant from the lip with a low annular inner bead or ange forming a secondary sealing device around the mouth of the perforation, substantially as described.
7. In a pneumatic sealing device, a iieXible cup of bell shaped formation centrally perforated through its head and provided with a peripheral lip, and further provided at a point distant from the lip with a low annular inner bead or iange forming a secondary sealing device around the mouth of the perforations, a tubular stem to which the perforated head of the cup is secured, a casing within which the stem is slidably mounted, and a spring interposed between the casing and the stern for holding the latter in outwardly projected position and allowing inward recession thereof under pres- 5 sure, substantially as described.
8. In a pneumatic sealing device, a cup of bell-shaped formation provided with a peripheral lip and provided at a point distant from the lip With an inner bead or ange forming a secondary sealing device, a tubu- 10 lar stem to which the cup is secured, a spring bearing against the stem, a casing Within which saidv stem is slidably mounted, and sealing members sealing the stem in sliding relation to the casing, substantially 15 as described.
PAUL C. HETZER. ANTON HETZER.
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|U.S. Classification||294/189, 279/3, 269/21|