US3707739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded brush head
Assignee: NAT BRUSH CO
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Filing: 1970-12-09
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Granted: 1973-01-02
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Expires: 1990-12-09
Abstract
Abstract A brush head of pushbrooms, or the like, with molded threads so that threaded handles can be screwed therein. The threads formed in such brush head have thread deformations that are formed by protuberances located on a pair of mold parts of such configurations so that the contoured portions formed by the mold parts closely approximate a complete thread within the respective openings to receive a threaded end of a broom handle. The contoured portions of the mold parts are fashioned to provide a zero draft or taper angle between the mold parts and the threads formed thereby so that linear parting of the mold parts is then possible. A pair of angularly disposed threaded openings can be formed by the mold.
Inventors
- 👤 B Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:05
CPC Classifications
B; B25; B25G; B25G3/00; B25G3/02; B25G3/12; B25G3/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A head for a workpiece including, a body of molded material having a working portion, at least one threaded opening formed in said body on a side thereof displaced from said working portion, said threaded opening having a plurality of internal threads with thread interruptions therein which allow linear parting of mold pieces during manufacturing of the head, said threads permitting entrance of a threaded handle and providing secure threaded interconnection therewith.
Claim 2
Dependent Claim
72 words
A head for a workpiece including, a body of molded material having a working portion, at least one threaded opening formed in said body on a side thereof displaced from said working portion, said threaded opening having a plurality of internal threads with thread interruptions therein which allow linear parting of mold pieces during manufacturing of the head, said threads permitting entrance of a threaded handle and providing secure threaded interconnection therewith.
Claim 3
Dependent Claim
71 words
The head of claim 1 wherein said body of molded material has a threaded opening on each side of the head and the axis of one opening is at an angle with respect to the axis of the other opening within a range of 40* to 135*, and both openings are at an angle with respect to the vertical axis of the head within a range of 20* to 60* .
Claim 4
Dependent Claim
57 words
The head of claim 1 wherein said body of molded material has a threaded opening on each side of the head and the axis of one opening is at an angle of 90* with respect to the other opening, and both openings are at an angle of 45* with respect to the vertical axis of the head.
Claim 5
Dependent Claim
141 words
A brush head for a pushbroom including in combination, a body of molded material having one substantially flat side and adapted to hold brush bristles, a plurality of bristles secured to said body and extending from said one side of said body, a pair of threaded openings formed in said body on the side thereof opposite to said one side, with the axis of each opening being at an angle within the range from 20* to 60* with respect to an axis perpendicular to said one side, said threaded openings each having a plurality of internal threads with interruptions in said threads on opposite sides of said openings to allow linear parting of mold pieces during molding of the brush head, said threads in each opening being adapted to cooperate with a threaded broom handle to provide secure threaded interconnection therewith.
Claim 6
Dependent Claim
141 words
A brush head for a pushbroom including in combination, a body of molded material having one substantially flat side and adapted to hold brush bristles, a plurality of bristles secured to said body and extending from said one side of said body, a pair of threaded openings formed in said body on the side thereof opposite to said one side, with the axis of each opening being at an angle within the range from 20* to 60* with respect to an axis perpendicular to said one side, said threaded openings each having a plurality of internal threads with interruptions in said threads on opposite sides of said openings to allow linear parting of mold pieces during molding of the brush head, said threads in each opening being adapted to cooperate with a threaded broom handle to provide secure threaded interconnection therewith.
Claim 7
Dependent Claim
50 words
The brush head of claim 4 wherein the axis of one opening is at an angle of substantially 90* with respect to the axis of the other opening, and the axes of both openings are at angles of substantially 45* with respect to the axis perpendicular to said one side.
References Cited (Backward Citations)
US3431967A
Cited
US3524210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |