US1694939A - Process of assembling filter-stack units - Google Patents

Description

De'c. l1, 1928. 1,694,939

v. R. HEFTLER PROCESS oF ASSEMBLING FxLTER STACK UNITS Filed Dec. 30, 1927 gwuemkya N9@ @@Qi* atroz/"ms I YPatented Dec. 11, 192s.

UNITED STATES- VIGTOR R. HEFTLER, OF DETROIT, MICHIGAN.

PROCESS lOIEl ASSEMBLING FILTER-STACK UNITS.

Application lcd December 3D, 1927. Serial No. 243,602.

This invention relates to an improved method of assembling the component laminary elements of a filter construction lsuch as is described and claimed in Letters Patent No. v 1,641,485, issued to me on September 6, 1927, which, however, made no eort to specify whether this particular phase of the devices manufacture should be effected manually or mechanically. The positioning of each disc upon the correlating member may of course be effected manually, but this is at best a long and tedious operation, and the process herein described is designed to simplify and abbreviate the work without impairment of the eiiciency of the completed structure, it being understood, as clearly brought out in the patent referred to, that the essence of the filter stack is 'the substantially coaxial and non-rotatable assemblage of the two classes of filtering dises in such a way as to form the stack described; and let it be pointed out at the outset that while in that patent and herein the central or correlating stem was assumed to be squared or at least rectangular, any non-circular cross section for the stem and for the correspondingly apertured center portions of the discs may be employed, Without departure from the fair spirit of my invention; for example, a hexagonal, Octagonal, or elliptical contour could be adopted without change of function or results.

In the drawings:

Figure 1 is a plan view vof two representative forms of filter disc which may bel designated as 'A and B respectively, whose alternating arrangement about a correlating stem results in the building up of the filter element.

Figure 2 is a perspective of several of these discs positioned coaxially and suiiciently spacedly, so ,as to bring out their cooperating function when assembled in the filter stack as a whole.

Figure 3 is a perspective view of aribbon of metal inwhich have been cut, in alternating relation along successive sections thereof, apertures corresponding in position to theintraeri heral portions of a complete disc of eadh o the series, A and B.

Figure 4 is. a 1an view of such a ribbon.

Figure 5 is a ragmentary plan View suggestin a slight modification wherein a ribbon o doub e lthe lordinary width is provided, in order that transversely of each unit of lengthwise'extent two partially cutcentral aperture, as C, four equidistantly spaced holes, as D, and four intermediately placed cut-away portions, as E, but, that relatively to the sides and corners of the squared hole C, these other two characterlstic parts -of the disc of series A and series B are placed on opposite sides of one another; for example, .that whereas the lower right corner of the squared aperture C in the disc A points radially outward substantially along the lower edge of one of the cut-away segments E, as brought out by the dotted line G, the corresponding lower right corner of the squared portion C of the disc B similarly points outward along the dotted line H substantially following` the top edge of one of the cut-away portions E.

It will be obvious from a study of the two types of washer, A and B, shown side by side in Figure 1, that if one of them, as for example A, were turned through a half circle, with its edge nearest B- as an axis, so as to-be superimposed, face downward upon the latter, the two would, in this position be of identical contour. Since, however, .the

'process involves an yentire abstinence from any overturning of either from their initial common plane as they are successively stamped out from the ribbon and fall successively in place in the stackthe two types of washers do vary in the respects shown.

It is thus obvious that if an alternated series of discs A and B are arranged about a squared stem passing through their similarly squared centers, the four open or cutaway peripheral portions E of each will lie in registry with unbroken peripheral portions as Q, of the disc above and the disc below, thus constituting the inlets leading .to the longitudinal channels in the stack as a whole, formed by the alternated registry of the four holes D in each disc and of the inner ends of the four cut-away portions E ofthe adjoining discs. If owever, some means such as the squaring of the stem K and the corresponding shaping of the central aperture lC in each-disc were not resorted to, this arrangement would not be automaticallyv effected when the discs are posiof a metallic or other ribbonlike strip, and

the first step of my process merely consists in thus preparing the strip M in the man- .ner broughtl out in Figures 3 and 4, either by successive punching with alternated. punches of variant cut or preferably by a single die cutting step, whose act-ive points or edges result in a cutting of the groups of apertures designated as a and b in Figure 3. These, it will be noted, are identical, except for positioning of the holes D and apertures E relatively to the sides and corners of the `square portion C. This still leaves the component material which is to result in the various discs sufficiently integrated with the web of the ribbon so that except for the forming of the holes it is unsevered therev from. All that remains, however, to complete the contouring of each dise lof either type A or type B is a further cutting operation by a round die, 'as-L, whose line of operative activity is indicated 'by the dotted line J, whichin Figures 4 and 5 isV truly circular, whereas in perspective Figure 3 it is shown as elliptical.

To effect this, the partiallyprepared ribbon M is successively positioned aided if desired by the accurately spaced guide holes P near the lateral edges of the ribbon so that in turn each of these partly formed disc sections are axially coincident with the central axis of the squared stem K, or other correlating member which is placed slightly subjacent thereof. As each section of the ribbon is brought into this position, it is subjectedto the action of a circular cutting die such as has just been described, and which I have indicated at L, which completes the severance in succession of those portions of the web of the ribbon which have formed the discs A and B from the remaining marginal portion thereof which may then be scrapped. These now severed disc sections are thus released by gravity-induced fall upon and over the squared stem K, and since they have beeny cut as regards their apertured portions in the alternating arrangement already mentioned, it is obvious that they will automatically fall thus upon and about the squared stem K thus leffecting the assemblage of its component disc elements rapidly, accurately, and with a minimum of labor. In the ribbon illustrated in perspective in Figure 8, I have indicated at R the cut-out hole left in the ribbon M after the final stamping out of each disc unit hasbeen completed. In thev broader form of ribbon illustrated in Figure- 5 these holes 'P may conveniently be positioned along the middle line thereof.

I desire it to be understood that I do not laniinary elements of a filtering stack, whichVU consists in first partiallystamping out the diverse members in alternating relationfrom a ribbon, and thereafter. successively sub- 'ecting each partially cut portion ofthe ribon to the action of a cutting die positioned in coaxial relation over a receiving element.

2. The process of effecting the alternated positioning upon a non-circular stem of a series of laminar-y filtering discs of similar though vva-riantly oriented interior perforatiofi, consisting in first partially cutting out units 'of each type alt-ernatingly from a ribbon and thereafter successively positioning each unit of the ribbon as thus cut in coaxial relation over a. receiving means and subjecting it to the completing cutting'action of a die of suitable contour, whereby each is blanked out from the remainder of the ribbon.

3. The process of building up about a stem a surrounding stack of laminary filtering elements in alternated peripheral registry, which consists in first perforating a .ribbon with selected components of each type of disc in successive pairs, and thereafter successivel positionin each section of the ribbon as t us prepare over the stem and completing the cutting operation. by eoaxially ap lied die action, whereby each unit is release in turn-for descent to its desired position of relative` orientation about the stem.

4. The process of formin and mounting about a stem a series of isc elements of similar contour though of alternated relative peripheral orientation, consisting in successively cutting out the interior portions of each disc lengthwise of a ribbon of the selected component material, and thereafter positioning each section of the ribbon Vas thus prepared in coaxial relation above the stem and successively liberating each unit from the surrounding web of the ribbon by eoaxially applied die action, 4for descent about the stem in maintained relative peripheral arrangement. v

5. 'lhc process of forming and positioning in alternating relation about a 'correlating stem a plurality of laminary filtering discs sitioned cut-away portions, consisting 1n first effecting the interior cutting required for each type of disc in alternating relation along the ribbon of selected material, and thereafter successively positioning each unit of the ribbon as thus prepared in coaxial relation over the stem and subjecting it to further cutting operation along the line of the intended periphery of each disc by a coaxially moving die member, whereby each disc unit is in turn released from the web of the ribbon for descent to its intended position about the stem.

6. The process of forming and positioning about a stem the component alternated discs of a filtering stack, which consists in first subjecting successive sections oi' a ribbon of selected material to alternatingly variant cutting operations whereby the intra-peripheral apertures characteristic of each type of disc are made in desired relative position, and thereafter successively positioning each section of the ribbon as thus prepared in eoaxial relaton over the stem and effecting the severance of each from the web of the ribbon by further appropriate cutting operation and allowing the then released and formeel discs to fall into position about the stem.

7. T he process of producing filtering discs of rariantly arranged intra-peripheral contour and of arranging them in desired alternat`on and relative orientation upon a correlating stem, which consists in first Cutting out partial outlines oi each characteristic type in successive alternation along. a ribbon or' suitable material, and thereafter completing the severance of' each unit from the Web 4()l ofthe material in smilar sequence as each is successively positioned m coax1al relatlon `tothe subjacently located stem, whereby each `unit When freed from the web of the ribbon may fall about the stem in suitably oriented.

relation to the adjacent units.

8. The process of assembling laminary units of alternatingly diverse periphera orientation in superimposed relation, consisting in partially blanking the same from parent stock and subsequently completing the severance thereof in position of operative alignment over a receiving element, and delivering them to the receiving element.

9. The process of assembling in coaxial relation a plurality of laminar-y units which are peripherally similar though of alternatingly variant orientation, consisting in effecting their partial severance from parent stock and then successively completing the severance of thev members ot' eachclass of' units in alternated relation over a receiving element whose` operative engagement, with each then severed unit efects the maintenance of their desired alternation.

10. The process .of producing and positioning in alternated coaxial relation a series of laminary elements of' similar though diversely oriented contour, consisting in first effecting the partial severance of the elements of each class from parent stock and thereafter alternatingly presenting such partly severed elements to the final severing action of an. operating member at the moment that each in succession is located o erativeiy adjacent a receiving element w ose action thereupon results in the maintenance of the desired alternation of the several elements. j

In testimony whereof I sign this specification.

VICTOR R. HEFTLER.

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