US4490872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral brush section
Assignee: United Rotary Brush Corp
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Filing: 1984-05-11
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Granted: 1985-01-01
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Expires: 2004-05-11
Abstract
Abstract A helical brush section consisting of a split tubular support or drum. The drum is offset at the split when the brush strip is helically wound thereon with its ends corresponding to the shoulders at the ends of the offset drum. Then the section is subjected to axial pressure to restore the drum to cylindrical form which distorts and flattens the ends of the brush strip inwardly substantially flush with the drum ends. Multiples of this resulting section are adapted to be disposed on a mandrel with their adjacent edges and shoulders in axially-abutting relationship to form a continuous helical rotary brush with a minimum of bristle gaps at the flattened ends of the brush strips.
Inventors
- 👤 Arthur E. Drumm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:28
CPC Classifications
A; A46; A46B; A46B5/00; A46B3/00; A46B3/08; A46B3/10; A46B3/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
A helical brush section for use in axially-aligned relationship to form a rotary brush comprising a tubular bristle-carrying drum, a brush strip helically wound on the drum from one end to the other with its ends at the drum ends, said strip being formed of a channel which carries radially-projecting bristles, said ends of the brush strip having the corresponding channel ends distorted inwardly substantially flush with the corresponding drum ends, said tubular support being rolled sheet metal joined at a longitudinal joint where the adjacent edges of the sheet are offset longitudinally to form opposed end helical edges and shoulders and the brush strip is helically wound thereon until its ends correspond to the shoulder and the drum is restored by axial pressure to cylindrical form which distorts the ends of the channel substantially flush with the drum ends.
Claim 2
Dependent Claim
140 words
A helical brush section for use in axially-aligned relationship to form a rotary brush comprising a tubular bristle-carrying drum, a brush strip helically wound on the drum from one end to the other with its ends at the drum ends, said strip being formed of a channel which carries radially-projecting bristles, said ends of the brush strip having the corresponding channel ends distorted inwardly substantially flush with the corresponding drum ends, said tubular support being rolled sheet metal joined at a longitudinal joint where the adjacent edges of the sheet are offset longitudinally to form opposed end helical edges and shoulders and the brush strip is helically wound thereon until its ends correspond to the shoulder and the drum is restored by axial pressure to cylindrical form which distorts the ends of the channel substantially flush with the drum ends.
Claim 3
Dependent Claim
42 words
A helical brush section according to claim 1 in which the bristle-carrying brush strip is wound helically about the drum in convolutions of selected pitch from one drum end to the other and is secured thereto at a plurality of angular positions.
Claim 4
Dependent Claim
57 words
A helical brush section according to claim 2 in which the bristle-carrying strip is in the form of a channel having bristles of U-form mounted therein with their closed ends in the channel, and a retaining wire extends through such ends and beyond the adjacent ends of the channel with such ends secured to said tubular support.
Claim 5
Dependent Claim
26 words
A helical brush-section according to claim 3 in which the drum has notches in its ends to provide edges where it is welded to the channel.
Claim 6
Dependent Claim
40 words
A helical brush section according to claim 4 in which the shoulders of the offset drum have notches into which the respective ends of the retaining wire are bent radially inwardly and then over the inner surface of the drum.
Claim 7
Dependent Claim
25 words
An assembly of helical brush sections of the structure defined in claim 2 disposed on a mandrel in abutting axial contact at the drum ends.
Claim 8
Dependent Claim
18 words
An assembly according to claim 6 including means for clamping the sections in axial contact on the mandrel.
Claim 9
Independent Claim
89 words
The method of forming a helical brush section which comprises forming a tubular support by offsetting the adjacent edges of a longitudinally-split tube at the split thereof to form opposed helical edges at its ends terminating in shoulders, and mounting thereon a helically-extending bristle-carrying strip with its ends corresponding to the shoulders and then subjecting the assembly to axial pressure to eliminate the offset of the tube so it is of substantially cylindrical form with the ends of the strip distorted to substantially flush relationship with the tube ends.
Claim 10
Independent Claim
89 words
The method of forming a helical brush section which comprises forming a tubular support by offsetting the adjacent edges of a longitudinally-split tube at the split thereof to form opposed helical edges at its ends terminating in shoulders, and mounting thereon a helically-extending bristle-carrying strip with its ends corresponding to the shoulders and then subjecting the assembly to axial pressure to eliminate the offset of the tube so it is of substantially cylindrical form with the ends of the strip distorted to substantially flush relationship with the tube ends.
Claim 11
Dependent Claim
43 words
The method of claim 8 in which the strip is formed as a channel with radially-projecting bristles, and winding the strip on the tube helically from one shoulder to the other and attaching the strip to the tube before applying the axial pressure.
Claim 12
Dependent Claim
28 words
The method of claim 9 in which the attaching is by welding at nothces formed at the ends of the tube to the channel of the brush strip.
Claim 13
Dependent Claim
17 words
The method of claim 10 in which driving collars are welded within the drum at axially-spaced positions.
Claim 14
Dependent Claim
48 words
The method of claim 7 in which the strip has U-shaped bristles held in the channel by means including a retaining wire having ends extending beyond the channel which is bent into notches at the tube shoulders into contact with its inner surface where they are welded thereto.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |