US 3359594 A
Description (OCR text may contain errors)
B. .1. PASTOOR 3,359,594
FOLDING CLOS URES Dec. 26, 1967 2 Sheets-Sheet l Filed April 2, 1965 INVENTOR f BEA/0 J. PAsTooR Attorney.:
Dec. 26, 1967 B, J. PASTOOR FOLDING CLOSURES 2 Sheets-Shee 2 Filed April 2, 1965 INVENTOR ,5E/v0 J. PAsTooR n Atlorney United States Patent O 3,359,594 FOLDING CLOSURES Beno Johannes Pastoor, 1170 Warden Ave., Scarborough, Ontario, Canada Filed Apr. 2, 1965, Ser. No. 444,970 Claims. (Cl. 16-178) The invention relates to improvements in folding closures and more particularly to closures adapted for use as concertina-type folding doors, or as overhead rolling doors in general use for garages and the like.
In doors of this type, a plurality of slats are joined in hinged relationship at their longitudinal edges and their efficiency, to a great extent, depends on the reliability of their hinges.
Previously known hinges of this general type are often unsuitable for this particular use because they do not provide full support along the whole edges of the slats, and where a plurality of such hinges are used at one joint the slightest misalignment results in malfunction of the hinge. Another disadvantage of conventional folding closures is that the hinged edges fully abut only when the slats are fully coplanar, with the result that, until such coplanar relationship is attained, unsightly gaps are left between the hinged sections, so that the unit must either be covered with a somewhat slack outer covering or must be engineered to be an exact lit in the doorway when fully extended.
Furthermore, after conventional hinges become worn with use, the adjacent hinged edges are no longer fully contiguous so that, as in the case of garage doors, they cease to be fully waterproof, their etliciency therefore being decreased so that rain or the like may enter the gaps and so contribute to rapid deterioration of the doors.
I have found that these disadvantages may be overcome by providing the slats which comprise such doors with members of circular, or part circular sections which extend the length of their longitudinal edges, one of each pair of mating edges having a smaller diameter member than the other of the pair, the rst being contained in the second in close, concentric, sliding relationship, and a labyrinth-like development of this principle to permit full and free relation between such slats while precluding the formation of any gap between their edges.
It is, therefore, a primary object of the present invention to provide a folding closure in which the slats are in full edge to edge contact over their full length so that the possibility of misalignment is substantially obviated.
Another object of the invention is to provide a folding closure in which there are no gaps between adjoining slats, regardless of the distance the closure must be extended.
A further object of the invention is to provide a folding closure which is substantially weatherproof, especially when utilized with the slats horizontal.
A still further object of the invention is to provide a folding closure in which the hinges may be multi-walled to ensure adequate support and also to provide a labyrinthtype seal between the slats.
Still another object of the invention is to provide a folding closure in which the slats may be divided horizontally in the case of a door closure into a plurality of separate panels to provide, for instance, a contrasting colour eifect, without upsetting the operation or eiciency of the closure.
A still further object of the invention is to provide a folding closure in which the hinge portion may be detachable from the slats, thereby enabling large slat sections, or a plurality of slat sections, to be utilized and readily interchanged if desired and providing the possibility of contrasting colour effects between the hinge portion and the detachable slats.
And generally the objects of the invention lare to provide a folding closure which will be attractive in appear- ICC ance, simple to operate, elicient in use and which can be produced economically.
With the above and other objects in view the invention consists in the novel features of construction, arrangements and combinations of parts set out herein and more particularly pointed out in the claims for novelty following.
In describing the invention reference will be made to the accompanying drawings in which:
FIGURE 1 is a perspective view of a folding closure showing my invention applied to a door opening, the closure being partially open.
FIGURE 2 is an enlarged fractional sectional view through a slat, taken on the line 2-2 of FIGURE 1.
FIGURE 3 is an enlarged cross sectional view through two slats in their folded relation, taken on the line 3 3 of FIGURE 1.
FIGURE 4 is an enlarged, fractional, horizontally sectioned view through a modified construction wherein the hinge elements have detachable connection with the slats.
FIGURE 5 is a sectional plan view of the structure of FIGURE 4, shown in fully folded condition.
FIGURE 6 is a sectional plan view of a further modification of the hinge structure wherein the portions of the co-operating hinge elements of a pair of elements which are adapted for connection to contiguous slats are differently formed.
FIGURE 7 is a perspective view of a modified form of door construction wherein the slats are formed of two superimposed sections which may be of Contrasting colour, joined together, the side walls of the two slats being partially broken.
FIGURE 8 is a perspective view, foreshortened, of a bottom supporting plate, utilized in the modification of FIGURE 7.
FIGURE 9 is an enlarged fractional sectional view through a slat, taken on the line 9-9 of FIGURE 7.
FIGURE l0 is a fragmentary perspective view of a modified form of slat supporting plate and associate slat.
FIGURE 11 is a fractional perspective view of a garage door of the roll-up type, showing the invention adapted thereto.
FIGURE 12 is an enlarged sectional and elevation of my hinge construction adaptable to the door structure shown in FIGURE ll.
FIGURE 13 is a side elevation of the complete garage door installation of FIGURE 11, shown in a diagrammatic form.
FIGURE 14 is an enlarged sectional and elevation of a multi-walled, labyrinth-type modication of my inventionadaptable to the door structure shown in FIGURE 1l.
Llke numeral of reference indicate corresponding parts in the various figures.
Referring to the drawings and particularly lirst to FIG- URES 1-3, in which the invention is shown applied t0 a door of the concertina type adapted to operate with- 1n a door frame, 20 denotes generally a door frame of conventional type, which consists of a top frame member 21 and vertical members 22, and 23 denotes generally my folding door assembly.
The closure member 23 consists of a plurality of elongated slats 24, each of which comprises a hollow member of rectangular cross section, and having parallel sides 24a closed at their edges by walls 24b. The closure assembly is formed by placing in edgewise relation to each other the number of slats required and by hinging together the adjacent edges of adjoining slats throughout the full length of said slats.
FIGURE 3 particularly illustrates the hinge mechanism, wherein the edges of each pair of meeting edges support co-operating hinge devices, or assemblies, designated generally as and 26, respectively, which are adapted for interconnection in such a manner as to permit such hinged slats to be swung from coplanar relationship to substantially parallel positions, as when the doorway is fully opened, or between lesser limits when such is required.
The hinge assemblies 25 and 26 are preferably formed as integral parts lof the edge walls of the slats to be hingedly connected and they extend laterally from the edge walls for the full length of the slats.
The hinge element 25 consists of two semi-circular walls 27 and 28 curving in opposite directions from a short web 29 which extends outwardly from the edge 24h, the wall 27 being' of considerably greater diameter than the wall 28 and extends from the slat edge in a semi circle which terminates in an end 30 in substantial opposition t0 the web 29. The Wall 28 extends from a v short outward web 31 in a curve opposite to the Wall 27.
The Wall 28 is of lesser diameter than the wall 27 and is coaxial with said Wall 27 and said Wall 28 terminates in an end 32 considerably short of the end 30 of said wall 27. Each edge of each slat contiguous to the slat having a hinge element 25, has a short web 33, of a slightly greater length than the web 29 of the slat to which it is to be hinged and from the outer end of each said web 33 extends a semi-circular wall 34 which is adapted to contain the wall 28 of the hinge member 25, as is clearly shown in FIGUR'E- 3. The wall 34 terminates in a web 35 Which-extends radially inwards at a point but slightly removed from and at right angles to the end 32 of the wall 28, when the two hingedly connected slats are folded to parallel relationship, as in FIGURE 3, and said web 35 terminates in a cylindrical centre post 36 Which is concentric to the wall 34.
From t-he drawing it will be obvious that the maximum diameter of the centre post 36 is slightly less than the internal diameter of the wall 28; the thickness of the wall 28 is slightly less than the width of the gap between the wall 34 and the post 36; the external diameter of the wall 34 is slightly less than the internal diameter of the wall 27.
Thus, upon assembly of an edge of one slat to that of another slat, which is effected by sliding them longitudinally into axial engagement to bring the walls 27, 28, 34 and the centre post into concentric relation the edges of the two slats become hingedly connected and cannot be separated under any normal circumstances by radial or lateral stress.
It should be noted that, as illustrated, when adjoining slats are folded flatly against each other, at least a 4minimal clearance must exist between the outer end 32 of the wall 28 and the web 35. Conversely, the maximum relative angle of opening between adjacent slats is governed by the point at which the Webs 31 and 35 come into relation.
The slat assembly constituting the folding closure is adapted to be supported from a carriage mounted on a track 37 which is mounted transversely of the door opening preferably in a suitable recess transversely of the top door frame member. This trackway may be of any of the well known trackways for the purpose and which for purposes of illustration only is shown as consisting of a frame having two spaced recesses 38 in which the wheels 39 carried on an axle 40 of the carriage assembly are adapted to roll.
4In order that each slat may be mounted independently for free rotation during the folding movement thereof across the door opening, a cylindrical shaft 41 is suspended from the axle in the longitudinal centre of the axle and depends downwards a `considerable distance below the trackwayy and enters a vertical sleeve 42 which is located in the exact centre of the slat which it is to support, said sleeve 42 being formed integral with and as a central tubular enlargement of the web 43 which extends across the slat and joins with the sides 24a. The
shaft 41 is provided with a circumferential groove 44 at some point within the sleeve 42 and in this groove is seated a circlip 45 which is of suicient outside diameter to extend beyond the shaft 41 into a groove 45a formed interiorly of the sleeve, to provide an abutment for the said sleeve and so provide a support for the slat. The web 43 supporting the sleeve 42 also contributes to the strength of the slat.
From the foregoing description of FIGURES 1, 2 and 3 it will be noted that in this broad embodiment of the invention, any required number of slats may be hingedly joined and rollably suspended from the track 37, the arrangement of the hinges being such that the door may be opened and closed in concertina fashion.
In FIGURES 4 and 5 a modified embodiment of the invention is illustrated for use with folding closures which must of necessity comprise a number of wide, heavy slats as, for instance, those utilized in schools, hospitals, gymnasiums and the like, for sub-dividing large rooms. In this embodiment of the invention the hinge assemblies adapted to connect contiguous edges of each two adjacent slats are separable from the slats and are readily interlocked therewith. In this embodiment FIGURES 4 and 5 show three slat sections which, although identical in construction, are for purpose of facility in describing their hinged relation, designated 50, a and 50b.
Each of such three slats and each other associated therewith, is hollow, of elongated rectangular section and is divided internally by a plurality of vertical, transverse walls 51 for maximum strength and lightness. A vertical sleeve 52 similar to the sleeve 42 of the structure shown in FIGURES 2 and 9 is located within each slat by means of a cross web 53, the sleeve 52 bein-g adapted to guide and locate the shaft 41 of the carriage assembly which rolls on the track 37. The slats are individually suspended from the respective shafts 41 similarly to the manner in which the slats 24 are suspended for turning movement on said shaft 41.
Each longitudinal edge 57 of each slat supports an endwise located T-device, the stem 58 of which extends outwardly from the transverse centre of the slat edge and the head 59 of which extends transversely of and in parallel relation to the edge of the slat.
In FIGURES 4 and 5 the slats 50 and 50a are interconnected by co-operating `hinge assemblies 60 which interlockingly engage with and connect the T-sections of adjacent slats, and the slats 50a and 50b are connected by co-operating hinge assemblies 60a which engage with and hingedly connect the T-sections carried by the contiguous edges of said slats 50a and Stb.
The co-operating hinge parts constituting the hinge assembly() employed to hingedly connect two adjacent slats, such as those designated 50 and 50a, and the hinge parts constituting the hinge assembly employed to hingedly connect the slats 50a and 50b, are carried by and form lateral projections from elongated box-like carriers 61, which are located at the ends of the respective hinge assemblies and have detachable connection with the T-devices carried by opposed slat edges. These box-like carriers are of rectangular cross section and are adapted to extend throughout the lengths of the slat edges with their outer sides paralleling the edges of the slats and slotted lengthwise, as at 61a, to slidably receive the stems 58 of the T-devices of opposing slat edges to place the heads 59 of the T-devices within the boxlike carriers and so support the hinge assemblies throughont their lengths.
The box-like carriers can readily be associated with the appropriate T-devices by placing them in endwise relation thereto and sliding the said elements into interlocking relative engagement. It will be obvious that the hinge assemblies can be readily attached to or detached fromthe slats.
Each hinge assembly adapted to hingedly connect adjacent slats along their -opposing edges consists, as stated above, of hinge parts carried by opposing box-like carriers 61. One of each pair of carriers 61, such as is carried by the slat 50a facing the slat 50 edgewise, carries as integral parts thereof from a web 62, two walls 64 and 65, each of substantially semi-circular section, the wall 64 being of larger diameter than the wall 65. The walls 64 and 65 are coaxial and extend outwards from the web 62 in opposite directions. The opposing box-like carrier 61 has an edgewise extending web 66 from which extends a semi-circular sectioned wall 67 which closely fits within the wall 64 and which at its end joins with a web 67a which extends radially inwards and terminates in a tubular centre post 68 which is coaxial with the wall 67 and is spaced from the wall 67 a distance slightly greater than the thickness of the wall 65 to freely receive the latter when the slats 50 and 50a are hingedly towards one another to bring the webs 62 and 66 towards one another as in the folding movement of the slats 50 and 50a.
Reference to FIGURE 4 will show that the curved walls 64 and 67 are of such horizontal extent as to substantially abut the webs 66 and 62 respectively, and that in such circumstances the slats 50 and 50a are held from coplanar relationship and so give a pleated appearance to the closure from the sides when fully extended. It is obvious, therefore, that the horizontal ex- Ytent of said walls will determine the pleated appearance of the closure an-d that such appearance may be readily predetermined in the construction of the closure.
As will be also noted from FIGURE 4, the curved elements comprising alternate hinge assemblies are curved in like direction while those with which they alternate are oppositely directed, this being necessary in order that the slats may swing in concertina fold fashion.
In FIGURE 5 the position assumed by the slats of FIGURE 4, and the hinge parts connecting same in the completely folded condition thereof, are clearly shown.
In FIGURE 6 a structure is shown wherein the portions of a hinge assembly which actually interlock to form the hinge construction are identical with the corresponding parts shown in FIGURE 4, but, the means for connecting one of the carriers (left side of FIGURE 6) for one of said parts to one slat corresponds to the means shown in FIGURE v4 and the means for connecting the carrier for the other hinge element to the other slat differs from the means shown in FIGURE 4.
Whereas in FIGURE 4 the slat 50a is clearly shown as having T-devices extending from opposite ends thereof and box-like carriers 61 have their adjacent walls provided with slots 61a to allow of interengagement of the carriers andthe slats, in FIGURE 6 the T-devices, designated at 70, associated with one hinge element, is formed as an extension of the outer wall of a carrier 71 and -the contiguous edge of the slat to ybe hingedly connected thereto is provided with a longitudinal slot 72 to receive the stem of the T-device to place the T-head within the slat to connect the hinge elements to the slats.
The means illustrated in FIGURE 6 (right hand side of hinge assembly) for connecting the carrier to the corresponding end of the associated slat corresponds to the means shown in FIGURE 4 yin that the carrier61 has its outer wall provided with a `slot 61a and the corresponding end of the slat carries a T-device for interlocking engagement with the carrier.
If desired, the outer edge of the slat designated 73 in FIGURE 6 may be provided with a slot 74 to permit of such edge being interconnected with a carrier having a T-extension.
In FIGURES 7, 8 and 9 a form of the invention is illustrated in which each of the slats of the closure consists of upper and lower sections75 and 76, respectively, joined in vertically aligned relation and each having hinge elements (not shown as same may be of any of lthe type described hereinbefore) falso vertically aligned `and adapted to lbe cooperatively related. Theupper and lower slat sections may be of contrasting colors or of different materials, as desired, to provide a closure having a novel and pleasing appearance.
As means to secure the slat sections in proper superimposed, close, endwise engagement with each other a sleeve 77, corresponding substantially to the sleeve 42 shown in FIGURE 2 extends downwards through the top slat section and engages a similar sleeve 78 in the bottom slat section and terminates short of the lower end of the bottom slat section. These sleeves 77 and 78 provide a housing for a headed shaft 79 which extends completely through the aligned slat sections and has its lower end Portion threaded, as at 81, to extend beyond the lower end of the sleeve 78.
Each sectional slat is provided with a shoe 82 on which it is adapted to rest and which is provided with an upstanding open-topped sleeve 83 in its longitudinal centre provided with internal threads 84 into which the threaded lower end v81 o}f the slat or rod 79 is adapted to be threaded by the aid of a Isuitable tool, (not shown) engagable with the head 85 of the said shaft. It is obvious that when the shaft is turned in the appropriate directions the shoe will be drawn up and will thus draw the upper and lower slat sections and their hinge parts tightly together.
The shoes 82 preferably have flat lower surfaces and have their ends rounded, as at [86, and have shallow upstanding side walls 87 to closely engage the sides of the lower slats. It is preferable, also, that there be provided at least one pair of upstanding floor bosses 88 and 89 at opposite sides of the sleeves 83 spaced therefrom endwise with respect to said sleeve, said bosses having straight vertical sides 90 extending parallel with the side walls 87 and spaced therefrom a suicient distance at each side to snugly receive the side walls -of the lower slats and being of the required dimensions lengthwise to engage the transverse reinforcing walls 51, so as to prevent misalignment of the shoes with respect to the slats.
IIn order to hold the upper and lower sections of the slats against horizontal misalignment each slat has therewithin in surface contact with vertically -aligned interior surfaces of the slat sections, a Hat-sided plate 90 which stands on the associated shoel 82 and extends upwards completely through the lower section and terminates within the upper slat section.
In FIGURE 10 a modified form of slat supporting shoe is designated generally by the numeral 91. This shoe has a at lupper surface 92 with rounded ends 93 and has shallow, parallel, upstanding side walls 94 positioned between the rounded ends. These upstanding side walls have top marginal portions 95 of reduced length with re- 'spect to said walls, positioned medially of the lengths incline of the slots 96 correspond with the incline of the anges 95. The slat-s and their shoes can readily be connected simply by raising the slats sufficiently to bring the slots 96 and the shoe flanges 95 into endwise alignment, upon which endwise relative movement will cause the shoe flanges to enter the slots. The hinge sections can now be lowered to rest on the rounded ends of theshoes.
The shoe anges are ma-de to correspond in length with the transverse depths of the slat walls from edge to edge, in which event it will be found that the slats and the shoes will be held to their relative positions by the edges of the hinge sections.
Referring now to FIGURES 11-13 wherein an extremely simple version of the invention is illustrated, suitable for use with garage doors or the like which require only a limited angular movement between adjoining slats.
=In the embodiment shown in said FIGURIES 11-13 the slats designated generally by the numeral 97, are arranged horizontally in edgewise parallel hinged relation and each may vconsist of .a number of hollow, integral sections 98. In this `arrangement the endmost sections of the slats are provided with hinge means for joining the slats to adjacent slats. y
'In FIGURE 12 a hinge connection between the meeting edges of two slats is shown, in which one edge of one slat section has an edgewise extending part 99 from which extends in opposite directions curved Iarms 100 and 101 of substantially equal length which describe in cross section the major part of a circle open along its part substantially in opposition to the part 99, as at 102, and the edge of the slat which is to -be co-operatively joined to the hinge element just described has an edgewise extending part 103 terminating in a full .circular section tube 104 adapted to `be a close sliding t within the part circle formed by the arms 100 and 101.
This arrangement allows the slats to depend from each other while the vportions 100 and 101 and 104 of the hinge mechanism remain fully connected. The relative angular movement between adjacent slats is, of course, Ilimited by the distance between the edges 105 and 106 of the arms 100 and 101 which act as stops for the part 103 and apart from the necessity of being a major arc, the design criterion determining the spacing between edges 105 and 106 is reliant on the space available for overhead storage, as shown at 107 in FIGURE 13, and consequently upon the maximum relative angles between adjacent door sections or slats 97 engendered during the rolling 4up or rolling down of the door.
It should be noted that upon assembling a number of slats 97 together, the mating hinge portions are slid axially into full engagement, although certain lapplications are envisioned wherein the slats may be fabricated of, say, a resilient plastic, where it will -be possible to assemble the tubes 104 to their positions within the arms 100 and 101 by a simple snap action, the weight of the material being so little as to preclude the possibility of the slats being inadvertently detached in the same manner.
Insofar asweatherproofing i-s concerned, it will be obvious that the semi-circular portion formed by the arms 100 and 101 acts asla shroud for the hin-ge mechanism as a whole and rain water or the like is deflected downwardly Aand away vfrom the hinge joint, and in addition the full surfacel contact between the component parts of ythe hinge effectively prevents the ingress of moisture by capillary action.
`FIGIURE 14 illustrates a similar but more sophisticated ,hinge than that shown in FIGURE 12, the uppermost component 108v comprising a pair of concentric, spaced apart, semi-.circular arms 109 and 110 joined by a radial web 111 at their inner sides and widely spaced at their outer ends. The annular gaps between the arms 109 and 110 are `adapted to receive a slotted tube-like member comprising semi-circular arms 112 and 113 which extend from an extension l114 of the one slat. A tubular member 1,15 iscarried by a web 1116 and is a close sliding fit within the innermost arms 109 and 110. The slotted tube-like device formedv by the `arms 112 and 113 and the centre tube v 115 form the lower component of one hinge element. The
I presently preferred forms of constructions and arrangement and certain modifications thereof, these are capable of variation and modification. I, therefore, do lnot wish to be limited to the precise details of construction and arrangements set out herein but desire to avail myself of such variations and modifications as come within the spirit of the invention.
What I claim is: v l1. A hinge construction comprising first and second 'j parts each provided with a web terminating in fastening means at one end thereof to secure the part to apanel or the like, said web lying in a plane substantially in coincidence with the plane of one side of a panel t0 which it is to be secured, the web of said first part supporting at its other end a radially spaced concentric arrangement of at least one partial cylindrical member and a compete cylindrical member supported by an inturned axial edge 0f the innermost of said partial cylindrical members, said inturned edge being located substantially opposite the supporting web of the arrangement in a plane substantially in common with the plane of the web, the web of the second part supporting at its other end an arrangement of at least two radially spaced partial cylindrical members telescopically slidable in an axial direction into concentric journable intermeshing relationship with the concentric cylindrical arrangement of the first part, the innermost partial cylindrical member of the second part journably meshing with the complete cylindrical member of the first part, the partial cylindrical members Aof the secondy part arcuately extending alternately in opposite directions from an axial edge of the web of that second part with the circumferential length of at least one of the partial cylindrical members of the second part being proportioned with respect to its point of Contact with the web of the first part and the circumferential length of the innermost partial cylindrical member of the first part being proportioned with respect to its point of contact with a web of the second part, to allow limited relative rotational movement between the cylinder arrangements when intermeshed, the axis of the cylindrical arrangements of one part lying substantially in a plane common with that of the supporting web of that part, and wherein in the folded position of the hinge the webs of the parts project substantially in the same direction with respect to the axis of the intermeshed cylinders.
2. The hinge construction as claimed in claim 1 wherein said fastening means each terminate in a plane projecting perpendicular to the plane of its associated web and parallel to the axis of the cylindrical arrangement of that part and in opposite directions with respect to each other when the hinge is assembled and in folded position.
3. A hinge construction comprising first and second parts provided with fastening means to secure the part to a panel or the like, said first part being provided with a web supporting a radially spaced concentric arrangement of at least one partial cylindrical member and a complete cylindrical member supported by an inturned edge of the innermost of said partial cylindrical members, said inturned edge being located substantially opposite the supporting web with respect to the arrangement and in a plane common with the plane of the one side of the web, said second part being provided with a web supporting a radially spaced concentric arrangement of partial cylindrical members telescopically slidable in ,a longitudinal direction onto and into intermeshed relationship with the cylindrical members of the first part, the innermost partial cylindrical member of the second part being rotatable between the complete y-cylindrical member and the innermost partial cylindrical member ofthe first part, the
axis of each arrangement lying in a plane common with vone side of the panel to which it is to be secured wherein, when said hinge parts are assembled in folded position, the innermost partial cylindrical members of the second part is enclosed between the complete cylindrical member and the innermost par-tial cylindrical member of the first part and said common planes are immediately adjacent each other in parallel relationship.
4. The hinge construction as claimed in claim 3 wherein the partial cylindrical members of one part alternately and arcuately project in opposite directions from the supporting web.
5. The hinge construction as claimed in claim 3 wherein the axis of the arrangement of cylindrical members of each Part are in a plane common with their associated Support-ingY WtlJS, said fastening means each terminating 9 in a plane perpendicular to the said common plane and 3,056,451 projecting in opposite directions with respect to each other 3,118,702 when the hinge is in assembled folded position.
1,384,844 References Cited 5 588,493 UNITED STATES PATENTS 524228 2,365,378 12/1944 Benson 160-235 2,641,018 6/1953 Snyder 160-235 10 10/ 1962 Federline et al. 160-235 X 1/1964 Kale et al i60-235 X FOREIGN PATENTS 11/1964 France. 11/ 1933 Germany.
8/ 1940 Great Britain.
DAVID J. WILLIAMOWSKY, Primary Examiner.
DENNIS L. TAYLOR, Exwminer.