Twisted-in-wire brush and method of manufacturing same
A bristle structure including at least two stem wires spirally wound together to form a longitudinally extending core of the bristle structure and a plurality of bristles extending outwardly from the longitudinally extending core. Each of the bristles has a first end and an opposed second end, and each of the bristles is clamped between the stem wires such that the second end of each bristle extends a greater distance from the longitudinally extending core than the first end of the each bristle.
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The present invention relates to a twisted-in-wire brush having an offset helical bristle pattern, and a method of making the brush.
BACKGROUND OF THE INVENTIONTwisted-in-wire (TIW) brushes are well known in the art. These brushes mechanically retain bristles between two or four stem wires. Traditionally, the bristles are centered lengthwise between the stem wires, which are then twisted to lock the bristles in place and to create a generally cylindrical brush having an outside diameter equal to the length of the bristles used.
As shown in
The resulting brush 10 has bristles 20 spirally revolving to form two helixes extending centered along the axis 40. Outer ends of the bristles 20 revolve to form an outside diameter 60 which is equal to the length of the bristles 20.
The stem wires 30 can extend beyond the brush portion containing bristles 20. This extension portion can be covered with a handle 70, as shown in
As shown in
The uniform outer diameter functions well when the brush is used against surfaces that have a correspondingly continuous or uniform surface (e.g., the inside of a round pipe or tube, or the flat surface of a metal plate). Problems arise, however, when such a brush is tasked with performing a cleaning function on an irregular surface. One such problem begins when a user attempts to force a typical TIW brush into recess portions of a surface such as in corners or along a grate, which often collect dirt and grime to be removed. For the typical TIW brush to reach these locations, many of the bristles must be bent or otherwise deformed to allow some of the bristles to reach the recessed surface. If such bristles are metallic in nature, the bristles may become permanently deformed, thus effectively ruining those portions of the brush for future use.
Another problem with traditional TIW brushes is their lack of space available to accept larger or bulky residue. Residue such as grease chunks, soil, or lint must be forced through the outside diameter of the TIW brush and then be lodged near the stem wire intermixed between the individual bristles. While this may seem like an advantage, any such residue is very difficult to remove allowing the TIW brush to be reused in the future.
Another disadvantage of traditional TIW brushes becomes apparent when the brushes are made having a relatively large outside diameter. Material costs for all metals and plastics have skyrocketed from historic levels. Traditional TIW brushes would require the bristles in such a brush having a large outside diameter to be the same length as the diameter of the brush itself. The cost of the bristles may then become a significant factor requiring a consumer to purchase a brush which is shorter than required or smaller in outside diameter than required. Either concession may reduce the cleaning effect desired by the consumer.
To avoid some of these pitfalls normally seen in traditional TIW brushes, designers have resorted to trimming selective bristles of a traditional TIW brush to form a contoured design. For example, TIW brushes used in the mascara industry often have bristles trimmed in a helical or arcuate shape to better allow the transfer of mascara from the TIW brush to a user's eyelash. The economy of such trimming is, however, questionable. The trimming process adds an additional, time consuming step to the process of manufacturing a TIW brush, and the raw materials that are trimmed from the brush during manufacture are typically wasted. While it is possible that the trimmed bristle material may be recycled, that material would need to be completely remanufactured before the material could be used again as a bristle.
For at least the reasons explained above, it is clear that a new TIW brush and method of manufacture is required to solve the above problems, while, at the same time decreasing the amount of waste created during the manufacturing process.
SUMMARY OF THE INVENTIONIt is an object of the present invention to overcome the problems with prior art brush designs, as discussed above. In accordance with one embodiment of the present invention, a bristle structure is provided that includes at least two stem wires spirally wound together to form a longitudinally extending core of the bristle structure. A plurality of bristles extend outwardly from the longitudinally extending core, and each of the bristles has a first end and opposed second end. The bristles are clamped between the stem wires such that the second end of each bristle extends a greater distance from the longitudinally extending core than the first end of each bristle.
The resultant bristle structure includes two helical patterns extending along the length of the brush, which provides a contoured outer brush surface that is more effective at cleaning irregular work surfaces.
In accordance with a second embodiment of the present invention, a bristle brush is provided that includes at least two stem wires spirally wound together to form a longitudinally extending core having a first end and an opposed second end. The bristle brush further comprises first and second support arms respectively extending from the first and second ends of the longitudinally extending core, and a plurality of bristles extending outward from the longitudinally extending core. Each of the bristles has a first end and an opposed second end, and is clamped between the stem wires such that the second end of each bristle extends a greater distance from the longitudinally extending core than the first end of the bristle. A handle is coupled to at least one of the first and second support arms.
Preferably, the first and second support arms are integral extensions of the stem wires that form the longitudinally extending core. According to one embodiment of the present invention, the first and second support arms extend along the longitudinally extending core, and a handle is coupled to only one of the support arms such that the handle also extends in substantially the same direction as the longitudinally extending core. In accordance with another embodiment, at least a portion of each of the first and second support arms extend in a direction substantially perpendicular to the longitudinally extending core, and a handle is coupled to both of the support arms such that the handle also extends in a direction substantially perpendicular to the longitudinally extending core.
In accordance with another embodiment of the present invention, a method of manufacturing a bristle structure includes the steps of positioning a plurality of bristles between at least two stem wires such that a first end of each bristle extends outward from the stem wires a first distance and a second end of each bristle extends outward from the stem wires a second distance greater than the first distance. The method further includes the step of spirally winding the stem wires together to form a longitudinally extending core of the bristle structure and to clamp the bristles between the stem wires. The first ends of the bristles collectively forming a first helical pattern extending along the longitudinally extending core and the second ends of the bristles collectively form a second helical pattern extending along the longitudinally extending core.
For a fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description of a preferred mode of practicing the invention, read in connection with the accompanying drawings in which:
For the sake of clarity,
The brush 100 takes on an auger-like appearance where the larger diameter 180 and the smaller diameter 160 helically extend along the length of the brush 100. Debris and other residue can easily reside in the brush 100 between the smaller diameter 160 and the larger diameter 180 helixes. Furthermore, the bristles 120 forming the larger diameter helix 180 can more easily reach into surface discontinuities and around rises, such as ribs of a grate (e.g., BBQ grill).
Referring now to
The process of aligning the bristles between the stem wires and subsequently twisting the stem wires can be accomplished through manual means. However, for the quantities and efficiency required with a larger scale production, an automatic machine can be selected. For example, a TIW brush 100 in accordance with the present invention can be made using a modified Borghi AB4 continuous cycle twisting machine. In the Borghi twisting machine, guides are typically arranged to center the bristles between two converging stem wires. The method of making a brush 100 in accordance with the present invention involves shifting the bristle guides to one side of their normal location so that the bristles 120 are no longer centered lengthwise between the two stem wires. It should be understood that other continuous cycle twisting machines can be used to create the brush 100 in accordance with the present invention.
The larger outer diameter helix 180 can be easily determined based on the distance between the bristle guides (not shown in
It should be understood that the present invention can be made with various different characteristics relating to the desired brush type. For example, the bristles 120 can be made from any known bristle material such as plastic, carbon steel, stainless steel, brass, aluminum, etc. Additionally, the stem wires 130 can be made out of similar materials such as carbon steel, stainless steel, brass, aluminum, etc. The number of bristles can also be varied according to the desired function of the brush. For example, the embodiment disclosed in
Stem wires 130 perform various functions. Stem wires 130 must be strong enough to generate sufficient grip between the two stem wires 130 to reliably retain the bristles 120. Additionally, certain uses require that the brush 100 have sufficient bending and buckling strength to allow the brush to be held in various directions and pushed into locations to be cleaned. Aside from the strength requirements, the diameter of the wire is important as the diameter sets the pitch of the helix to be formed by setting the space held between the individual bristles or groups of bristles. As is well known in the art, more stem wires 130 can be utilized to nearly double the distance between the bristles and nearly double the length of one pitch of the helix.
One application of the novel brush design according to the present invention is a grill cleaning brush, as shown in
Another application is a lint brush for cleaning dryer vents, as shown in
While the present invention has been particularly shown and described with reference to the preferred mode as illustrated in the drawings, it will be understood by one skilled in the art that various changes may be effected therein without departing from the spirit and the scope of the invention as defined by the claims.
Claims
1. A bristle structure comprising:
- at least two stem wires spirally wound together to form a longitudinally extending core of said bristle structure; and
- a plurality of bristles extending outwardly from said longitudinally extending core, each of said bristles having a first end and an opposed second end and being clamped between said stem wires such that said second end of each bristle extends a greater distance from said longitudinally extending core than said first end of said each bristle.
2. The bristle structure of claim 1, wherein all of said bristles have substantially the same length.
3. The bristle structure of claim 2, wherein said second end of each bristle extends from said longitudinally extending core a distance that is at least 10% greater than the distance that said first end of said each bristle extends from said longitudinally extending core.
4. The bristle structure of claim 2, wherein said first ends of said bristles collectively form a first helical pattern extending along said longitudinally extending core, and said second ends of said bristles collectively form a second helical pattern extending along said longitudinally extending core.
5. The bristle structure of claim 4, wherein the diameter of said first helical pattern is less than the diameter of said second helical pattern.
6. The bristle structure of claim 2, wherein said second ends of said bristles collectively form a second helical pattern extending along said longitudinally extending core, and said second helical pattern has a diameter that is greater than the length of said bristles.
7. A bristle brush comprising:
- at least two stem wires spirally wound together to form a longitudinally extending core having a first end and an opposed second end;
- first and second support arms respectively extending from said first and second ends of said longitudinally extending core;
- a plurality of bristles extending outward from said longitudinally extending core, each of said bristles having a first end and an opposed second end, and being clamped between said stem wires such that said second end of each bristle extends a greater distance from said longitudinally extending core than said first end of said each bristle; and
- a handle coupled to at least one of said first and second support arms.
8. The bristle brush of claim 7, wherein said first and second support arms are integral extensions of the stem wires that form said longitudinally extending core.
9. The bristle brush of claim 8, wherein said first and second support arms extend along said longitudinally extending core, and said handle is coupled to only one of said support arms such that said handle also extends in substantially the same direction as said longitudinally extending core.
10. A lint brush for cleaning the exhaust duct of a clothes dryer comprising the bristle brush of claim 9.
11. The bristle brush of claim 8, wherein at least a portion of each of said first and second support arms extends in a direction substantially perpendicular to said longitudinally extending core, and said handle is coupled to both of said support arms such that said handle also extends in a direction substantially perpendicular to said longitudinally extending core.
12. A grill brush for cleaning the grill rods of a barbeque grill comprising the bristle brush of claim 11.
13. The bristle brush of claim 7, wherein all of said bristles have substantially the same length.
14. The bristle brush of claim 13, wherein said second end of each bristle extends from said longitudinally extending core a distance that is at least 10% greater than the distance that said first end of said each bristle extends from said longitudinally extending core.
15. The bristle brush of claim 13, wherein said first ends of said bristles collectively form a first helical pattern extending along said longitudinally extending core, and said second ends of said bristles collectively form a second helical pattern extending along said longitudinally extending core.
16. The bristle brush of claim 15, wherein the diameter of said first helical pattern is less than the diameter of said second helical pattern.
17. The bristle brush of claim 13, wherein said second ends of said bristles collectively form a second helical pattern extending along said longitudinally extending core, and said second helical pattern has a diameter that is greater than the length of said bristles.
18. A method of manufacturing a bristle structure, comprising the steps of:
- positioning a plurality of bristles between at least two stem wires such that a first end of each bristle extends outward from the stem wires a first distance and a second end of each bristle extends outward from the stem wires a second distance greater than the first distance; and
- spirally winding the stem wires together to form a longitudinally extending core of the bristle structure and to clamp the bristles between the stem wires, whereby the first ends of the bristles collectively form a first helical pattern extending along the longitudinally extending core, and the second ends of the bristles collectively form a second helical pattern extending along the longitudinally extending core.
19. The method of claim 18, wherein all of the bristles have substantially the same length.
20. The method of claim 19, wherein the second end of each bristle extends from the longitudinally extending core a distance that is at least 10% greater than the distance that the first end of said each bristle extends from the longitudinally extending core.
21. The method of claim 19, wherein the diameter of the first helical pattern is less than the diameter of the second helical pattern.
22. The method of claim 19, wherein the diameter of the second helical pattern is greater than the length of the bristles.
Type: Application
Filed: Aug 25, 2006
Publication Date: Feb 28, 2008
Applicant: Brushtech, Inc. (Plattsburgh, NY)
Inventor: Armen G. Gunjian (Plattsburgh, NY)
Application Number: 11/509,916
International Classification: A46B 3/18 (20060101);