|Publication number||US3551936 A|
|Publication date||Jan 5, 1971|
|Filing date||Aug 7, 1968|
|Priority date||Aug 7, 1968|
|Publication number||US 3551936 A, US 3551936A, US-A-3551936, US3551936 A, US3551936A|
|Inventors||Louis F Kutik, Erich W Gronemeyer|
|Original Assignee||Louis F Kutik, Erich W Gronemeyer|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (8), Classifications (16)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Ja n. 5, 1971 Filed Aug. 7. 1968 @llllllllllllllllllillm L. F. KUTIK L- BRISTLED PRODUCT 2 Sheets-Sheet. 1
INVENTORS LOUIS F. KUTIK BYERICH W. GRONEMEYER Jan, 5, 1971 K ETAL 3,551,936
BRISTLED PRODUCT Filed Aug. 7, 1968 2 Sheets-Sheet 2 INVENTORS LOUIS F. KUTIK I BY ERICH vv. GRONEMEYER Q m, MM
United States Patent W U.S. Cl. -187 7 Claims ABSTRACT OF THE DISCLOSURE A bristled product including a backing portion made of plastic material and plastic bristles integral therewith. The backing portion is in a zig-zag or accordian or pleated configuration such that it may be collapsed to position the bristles closer together than in the extended condition.
BACKGROUND OF THE INVENTION This invention is related to the inventions described and claimed in the previous U.S. Pat. Nos. Re. 26,403 and 3,357,058 of Louis F. Kutik which respectively cover a bristled product and method and apparatus for making such bristled product. In the earlier of these patents, a brush is disclosed in which the bristles are integral with the backing portion of the brush, and the bristles of each adjacent row are staggered with respect to the other bristles and have fiat sides and sharp edges, such being particularly desirable in toothbrushes for good flexing and cleaning action. The injection molding of such brushes is covered in the later patent, and this involves the use of a mold of relatively thin laminations with the laminations having slots cut entirely therethrough in the shape of the bristles to be formed, the slots communicating with a cavity for forming the backing portion of the brush.
In some cases, it is desirable to make brushes ha-ving relatively long bristles, examples of such brushes being paint brushes, brooms, industrial brushes, utility brushes and others. It has been found as a practical matter that if the slots in the laminations are more than about six times longer than the center-to-center spacing between slots, there is an excessive tendency for the material of the laminations or plates between slots to bend sidewise and thus narrow a slot. This interferes with the proper molding of the bristles, and can also interfere with removal of bristles from the slots.
It has also been found that in some cases it is desirable to increase the density of the bristles beyond that obtained with the bristled product in the condition it has when it is removed from the mold. Thus, with a given spacing of slots in a plate or lamination of the mold, a given distance between rows of bristles will be attained. For some brushes, such as paint brushes, it is desirable to have the rows of bristles closer together than is obtained by normal spacing of the slots, and this is particularly true where the brush is to have long bristles.
SUMMARY OF THE INVENTION The present invention alows the use of slotted laminations or plates for molding bristled products with long bristles by providing means for bracing the material be tween slots to prevent sidewise deflection thereof during the molding process. In a preferred embodiment, the bracing means consists of pins which extend through openings in the plates, there being at least one opening between each adjacent pair of slots. The longer the slots, the more openings, and pins are provided between each adjacent pair of slots. The use of such pins requires a relatively great lateral separation between each adjacent pair of slots, and since the slots of alternate plates are 3,551,930 Patented Jan. 5, 1971 aligned, the rows of bristles in the product formed by the mold will also be widely separated. The invention provides a way of reducing the separation between these rows of bristles, and this is accomplished by molding the backing of the product in a zig-zag or accordian or collapsible configuration such that it may be collapsed to position the bristles closer together than in the extended condition of the backing portion. The invention includes the product with the zig-zag backing. The product may include a holder retaining the backing portion in the collapsed condition and providing a handle to be grasped in manipulating the product where it is used as a brush or broom.
An object of the invention is to provide a bristled product including a plastic backing portion and plastic bristles integral therewith wherein the backing portions can be collapsed to increase the density of the bristles.
Another object of the invention is to provide a bristled product having a backing portion and integral bristles wherein the backing portion has a pleated configuration facilitating collapsing or folding thereof.
A further object of the invention is to provide a pleated backing for a bristled product having peaks and valleys with rows of bristles located respectively at the valleys and with the peaks between the rows of bristles so that the backing can be collapsed to position the rows of bristles closer together than in the extended condition of the backing portion.
Other objects of this invention will appear in the following description and appended claims, reference being had to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.
On the drawings:
FIG. 1 is a perspective view of a bristle brush of the type having a backing portion with relatively long bristles integral with the backing portion;
FIG. 2 is an exploded perspective view showing three of a plurality of plates or laminations which are assembled together with pins to form a mold for molding the brush of FIG. 1;
BIG. 3 is a perspective view of a large number of laminations as shown in FIG. 2 assembled together;
FIG. 4 is a fragmentary sectional view of a mold utilizing the laminations of FIGS. 2 and 3;
FIG. 5 is a perspective view showing a modification of the plates or laminations of FIG. 2 to utilize longer slots, the material between slots being braced by two pins-instead of one as in FIG. 2;
FIG. 6 is a perspective view of a paint brush in a partially disassembled conditon showing a pleated backing with relatively long bristles integral therewith;
FIG. 7 is an elevational view, partly in section, showing the paint brush of FIG. 6 in assembled condition, and also showing in dashed lines the condition of the parts of the brush just prior toassembly;
FIG. 8 is a fragmentary sectional view of a mold in which the pleated backing and bristles for the brush of FIGS. 6 and 7 can be molded; and
FIG. 9 is a cross-sectional View of a collapsed backing portion with integral bristles held in place by a holder having a handle thereon.
Before explaining the present invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of other embodiments and of being practiced or carried out in various ways. Also, it is to be understood that the phaseology or terminology employed herein is for the purpose of description and not of limitation.
As shown on the drawings:
A brush is shown in FIG. 1, and includes a plastic backing portion or head 12 and a plurality of elongated plastic bristles 14 integral with the head 12 and projecting from one side thereof. This brush is of the type described and claimed in the aforementioned Pat. No. 3,214,777 and so will not be described in detail herein. It is worth mentioning, however, that the bristles 14 may be arranged in parallel rows, and that the bristles in adjoining rows may either be aligned with each other or may offset from each other depending upon the type of mold which is used to fabricate the brush.
FIGS. 2, 3 and 4 illustrate a mold assembly in accordance with the invention which may be used in fabricating the brush 10 of FIG. 1.
The mold 16 (FIG. 4) includes a plurality of laminations or plates 18 which are specifically designed to facilitate the injection molding of relatively long bristles 14 on the backing portion 12 of the brush. Laminations 18 are of two types, those designated 18a being provided with slots 20 and those designated 1811 having no slots therein. Slots 20 are cut, ground or otherwise formed entirely through plate 18a and have the shape and dimensions desired for the bristles 14. The slots 20 open at the top edge 22 of plate 18a, and when all of the plates 18 are assembled in a mold 16 and as in FIG. 4, the open ends 20 at edge 22 communicate with a cavity 24 having the shape and dimensions of the backing portion 12 of the brush. It may be that the unslotted plates 1811 on opposite sides of plate 18a close the slots 20 at the sides thereof so that the slots are closed on all sides except at the open ends which communicate with cavity 24.
In the mold 16 of FIG. 4, the plates 18 are clamped together laterally by blocks 26 and 28, and holding force may be applied to one of the blocks such as 28 by suitable clamping or holding means. In the illustrated embodiment, a hydraulic or pneumatic cylinder device is employed which has a piston 30 for applying force to the block 28 to hold the plates 18 together. It will be understood, however, that other holding means can be employed, and a wedging device for this purpose is described and claimed in applicants Pat. No. 3,357,058. Additional blocks 32 and 34 are provided on the top and bottom respectively of the mold 16, and the block 34 cooperates with blocks 26 and 28 and plates 18 to define the cavity 24 for the backing portion of the brush. Similar blocks are provided at the front and rear ends of the mold.
Plasticized material is introduced into the cavity 24 through a passage 36, and this plasticized material is in jected under pressure into cavity 24 and the slots 20 of the slotted plates 18a. When the plastic has solidified, the mold is separated and the brush is removed from cavity 24 and slots 20. The structure for separating the mold and for removing the brush from the mold may be of the type illustrated in FIGS. 18 and 19 of applicants prior Pat. No. 3,357,058.
It has been found that when the slots 20 are made more than about six times greater in length than the width W which is the center-to-center spacing between the slots 20, there is a tendency for the material between the slots, such as at 40, to bend sideways as a result of an injection pressure. Thus, a slot at one side of the material will be narrowed and a slot at the other side of the material 40 will be enlarged. This not only makes the bristles formed by the slots non-uniform in size, but it may also interfere with the removal of the bristles from the slots. Specifically,
those slots which are narrowed as a result of the deflection of the material 40 might tend to bind a bristle formed therein, and thus make it diflicult to remove a bristle from the slot.
In accordance with the invention, this problem is solved by bracing the material 40 between each adjacent pair of slots 20 to prevent sidewise displacement of the material 40. In the illustrated embodiment, this bracing is accomplished by providing at least one opening 42 through the material 40 between each adjacent pair of slots, and by providing pins 44 which extend through the openings 42 and engage the material 40 to prevent it from being deflected. The pins 44 fit snugly in the openings 42 so that they contact material 40 and hold it against displacement. Of course, openings 46 are also provided in the plates 18b on opposite sides of plate 18a, the openings 46 being in alignment with respect to the openings 42 in plate 18a. Thus, each pin 44 is inserted through an aligned set of openings in the plates 18a and 18b. Although only three plates are shown in FIG. 2, it will be readily understood that openings 42 and 46 are provided in all of the plates 18 included in the assembly of plates shown in FIGS. 3 and 4. Somewhat larger openings 46' and 42 are provided in the material at the ends of the plates 18a and 18b as shown, and the pins 44 fitted in these openings are also somewhat larger than pins 44. It will be understood, however, that this difference in size is not essential.
At the ends of the plates 18a and 18b opposite those where the openings 42 and 46 are provided, additional openings 50 and 52 are formed in all plates to receive guide pins 54 and 56 for retaining the respective ends of the plates in alignment. The pins 54 and 56 may extend only through the thickness of the plate assembly as shown in FIG. 4, or they may extend through blocks 26 and 28 if desired.
The longer the bristle defining slots, the more tendency there is for the molding pressure to deflect the material btween the slots. FIG. 5 shows an embodiment in which a plate 60 is provided with slots 62 which are substantially longer than the slots 20 of FIG. 2, although the slots 62 are in all other respects similar to the slots 20. It is apparent with slots as long as the slots 62, the material 64 between each adjacent pair of slots is comparatively weak and may be very easily deflected if their is a substantial imbalance of pressure in the two slots on opposite sides of the material 64. Accordingly, to brace the material 64 properly, two openings 66 and 68 are provided in the material 64 between each adjacent pair of slots, and two pins 70 and 72 are received snugly by the openings 66 and 68. Of course, openings 74 and 76 are provided in the plates 78 on opposite sides of plate 60 in alignment with openings 66 and 68 respectively in order to receive the pins 70 and 72. It will be apparent that the pins 70 and 72 extend through a whole series of plates identical to the plates 60 and 78 shown in FIG. 5. Guide openings 80 and 82 and guide pins 84 are also provided.
In order to receive the pins 44 in the embodiment of FIGS. 2 through 4 or the pins 70 and 72 in the embodiment of FIG. 5, it is apparent that the material between slots must be wide enough to accommodate the pins. Since this width might be greater than is desired for the spacing between rows of bristles in some brushes, it is desirable to provide some way of increasing the density of the bristles. This has been accomplished in the embodiment of FIGS. 6, 7 and 8 by providing a brush which has a collapsible backing portion, as will now be described.
FIGS. 6 and 7 illustrate a brush which has a plastic backing portion 92 with a zig-zag or pleated configuration allowing it to be collapsed. The backing portion 92 includes a series of peaks 94 and a series of valleys 96 with rows of bristles 98 being provided respectively on the valleys 96 of the backing portion. The peaks 94 are located between the rows 98 of bristles. The backing portion 92 may be molded integrally at 100 with holder members 102 and 104, and the holder members 102 and 104 may be joined together in the manner illustrated in FIG. 7 to form a holder for the brush, the holder providing a handle 106 to be grasped in manipulating the brush. Alignment pins 107 and 109 are provided on member 104 to be received in openings in member 102 when these members are assembled as in FIG. 7. In the completed brush, the holder members 102, 104 cooperably define a socket receiving the compressed backing portion 92 therein.
In FIG. 7, the backing portion 92 and the holder members 102 and 104 are shown in dashed lines in an extended condition prior to assembly to form the complete brush. When the holder members 102 and 106 are brought together, the pleated backing portion 92 collapses or folds to the configuration shown in solid lines in FIG. 7, thus positioning the rows of bristles 98 closer together than when the backing portion is in its extended condition.
FIG. 8 illustrates the method and apparatus for molding the backing portion 92 and rows 98 of bristles shown in FIGS. 6 and 7. Since this apparatus is very similar to that shown in FIG. 2, like reference numerals will be used for like parts. A plurality of plates 18 are provided and as indicated in FIG. 2, there are slotted plates 18a and unslotted plates 18b on opposite sides of plates 18a.
Only the slotted plates 18a are shown in FIG. 8. The bristle defining slots 20 open at their ends into a zig-zag or accordian-fold shaped cavity 24' which is defined by the edge 22 of the plate 18a and a block 110 which is also part of the mold. The edges 22 of the plates 18 have a zig-zag configuration desired for one surface of the backing portion 92, and the block 110 also has a zig-zag configuration at projections 112 matching that of the edges 22' but spaced from those edges so as to define the cavity 24'. The pins 44 for bracing the material 40 between each adjacent pair of slots are apparent, as are the pins 54 and 56 for aligning the plates 18.
The mold includes side blocks 114 and 116, an upper block 118, and suitable surrounding structure for retaining the plates 18 in the proper positions. Clamping blocks similar to blocks 26 and 28 of FIG. 4, and a holding device similar to piston 30 may also be used.
In molding the backing portions 92 and the bristles 98, plasticized plastic material is injected under pressure through a passageway 120 into the backing-defining cavity 24 and from there into the slots 20. After the plastic has solidified, the mold is separated and the bristled product is removed from the mold. The backing portion 92 formed by the mold is then collapsed and held in collapsed condition as with holder members 102 and 104 in the manner described previously.
FIG. 9 shows an embodiment similar to that of FIGS. 6 and 7. In this embodiment, the bristled product 130 includes a plastic backing portion 132 of a pleated configuration held in a collapsed or compressed condition by a holder 134 having a handle 136 which can be grasped in manipulating the product. The backing portion 132 is initially molded to have a pleated configuration like the backing portion 92 shown in FIG. 6. Thus, backing portion 132 has peaks 128 and valleys 140, with the rows 142 of bristles projecting from the valleys 140. The peaks 138 are located between the valleys 140. Thus, when the backing portion 130 is compressed and collapsed as shown in FIG. 9, the valleys 140 contact each other and the peaks 138 also contact each other to give a certain amount of rigidity to the backing portion, even though the peaks and valeys are fiat in this embodiment. The backing portion 132 includes upturned sides 144 which are received in slots at the sides of the holder 134 and portion 144 have lips 146 which, together with the fingers 148, secure the backing portion 132 in place in the receiving socket defined by the holder 134 and the fingers 148.
Thus, the invention provides bristled products which facilitates the provision of long bristles on the products, and also provides a way of increasing the density of the bristles, even though the bristles are integral with the backing portion of the product. The structure involved in the product is not complicated and all that is required to increase the density of the bristles is to collapse or compress the backing portion of the product. The method and apparatus for molding the product have been provided with eflicient means for preventing sidewise deflections of portions of the bristle-defining plates. This allows longer bristles to be molded on the product. The structure for preventing such deflection is compatible with the molding of the collapsible backing portion, as has been described.
Having thus described our invention, we claim:
1. In a bristled product of the type including a backing portion having a plurality of bristles projecting from one side thereof, the improvement wherein said backing portion has a collapsed condition and an extended condition and in the extended condition thereof said backing portion has a pleated configuration and includes a plurality of valleys at which rows of bristles are respectively located and a plurality of peaks located respectively between adjacent ones of said valleys, said backing portion being collapsible into said collapsed condition wherein said rows of bristles are closer together than in said extended condition of said backing portion.
2. The bristled product as claimed in claim 1 including a holder for said backing portion holding the same in said collapsed condition.
3. The bristled product as claimed in claim 2 in which said holder includes a handle to be grasped manually to permit manipulation of said product.
4. The bristled product as claimed in claim 2 in which with said holder holding said backing portion in said collapsed condition thereof, said valleys of said backing portion are in contacting relation each with the valleys at the side or sides thereof.
'5. In a bristled product of the type including a backing portion made of plastic material and a plurality of plastic bristles integral with said backing portion, the improvements wherein said backing portion has a pleated configuration and includes a plurality of peaks and valleys with rows of bristles located at least at said valleys, said backing portion having a collapsed condition wherein said rows of bristles are respectively adjacent to each other, and handle means having a retaining socket receiving the compressed backing portion there- 1n.
6. In a product as defined in claim 5, the further improvement of said handle means being integral with said backing portion and comprising separate sections secured together to define said socket.
7. In a product as defined in claim 5, the further improvements of said handle means being separate from said backing portion and means securing said backing means in said retaining socket.
References Cited UNITED STATES PATENTS 1,739,324 12/1929 Neissl 15-202 2,171,591 9/1939 =Minich 15-l88X 2,871,494 2/1959 Weyl 15-203X 2,986,606 6/1961 Weyl l5-203 3,398,419 8/1968 Carlos l5146X 3,402,416 *9/1968 Shaw et a1. 15-187X FOREIGN PATENTS 886,285 1/1962 Great Britain.
PETER FELDMAN, Primary Examiner US. Cl. X.R.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3687413 *||Dec 15, 1969||Aug 29, 1972||American Cyanamid Co||Fabrication of plastic spinnerettes by means of stacked mandrels|
|US3707013 *||Oct 23, 1970||Dec 26, 1972||Nils Arne Erkers||Disposable brush-like cleaning utensils, particularly intended for dental hygiene purposes|
|US4325901 *||Jul 3, 1980||Apr 20, 1982||Schlegel (Uk) Limited||Method of brush manufacture|
|US4514356 *||Apr 8, 1983||Apr 30, 1985||Harrison David E||Method of molding a plastic toilet seat hinge connectable bed plate|
|US4819670 *||Aug 20, 1987||Apr 11, 1989||Albert Saferstein||Flexible lice comb|
|US5380069 *||Apr 14, 1992||Jan 10, 1995||Klinkhammer; Ronald W.||Pleated panel strip brush construction|
|EP1876005A1 *||Jul 7, 2006||Jan 9, 2008||RKT Rodinger Kunststoff-Technik GmbH||Injection mould with lamellar elements|
|WO1987003242A1 *||Nov 27, 1985||Jun 4, 1987||American Mold Company, Inc.||Stack mold|
|U.S. Classification||15/187, 15/203, 425/129.1, 425/805, 425/542, 15/207.2, 15/143.1, 15/146, 264/243|
|International Classification||B29C45/26, A46B1/00|
|Cooperative Classification||B29C45/2626, Y10S425/805, A46B1/00|
|European Classification||A46B1/00, B29C45/26H|