US3996330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a molded brush back
Assignee: PRO Corp A CORP OF
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Filing: 1975-10-23
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Granted: 1976-12-07
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Expires: 1995-10-23
Abstract
Abstract A finished plastic-handled brush is prepared by a single molding step involving gateless molding of the brush back by a tunnel-gating and novel punch-pin finishing apparatus and process which eliminates the usual gate stud, and removing the finished brush back and securing tufts of bristles in the face of the brush back to complete the brush construction.
Inventors
- 👤 Kenneth B. Jones
- 👤 Walter C. Gorenflo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:59
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/57; B29C45/572; B29C45/26; B29C45/2626; B29C45/27; B29C45/28; B29C45/2806; B29C2045/577; Y; Y10; Y10S; Y10S425/00; Y10S425/805
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
The process of making a finished brush back, comprising: injecting a plastified thermoplastic material into a cavity of a mold through a tunnel gate communicating with said cavity, moving a punch pin into said gate until an end of said pin is flush with an inner surface of a wall of said mold defining said cavity, to force thermoplastic material from said gate into said cavity, accomplishing said moving by moving horizontally one wedge of a pair of cooperating wedges to actuate a second wedge of said pair causing it to move transversely to the direction of movement of said first wedge, said second wedge actuating said pin, while preventing movement of said second wedge, in a direction parallel to the direction of movement of said first wedge, by movably receiving a guide pin in an aperture therein.
Claim 2
Dependent Claim
138 words
The process of making a finished brush back, comprising: injecting a plastified thermoplastic material into a cavity of a mold through a tunnel gate communicating with said cavity, moving a punch pin into said gate until an end of said pin is flush with an inner surface of a wall of said mold defining said cavity, to force thermoplastic material from said gate into said cavity, accomplishing said moving by moving horizontally one wedge of a pair of cooperating wedges to actuate a second wedge of said pair causing it to move transversely to the direction of movement of said first wedge, said second wedge actuating said pin, while preventing movement of said second wedge, in a direction parallel to the direction of movement of said first wedge, by movably receiving a guide pin in an aperture therein.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the punch-pin movement is provided by a cam slide.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the cam slide is operated by means of a hydraulic cylinder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |