US3815533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum thread trimmer
Assignee: Individual
•
Filing: 1973-02-06
•
Granted: 1974-06-11
•
Expires: 1993-02-06
Abstract
Abstract A vacuum thread trimmer for attachment to a conventional sewing machine including a vacuum box connected to a vacuum machine with the vacuum box having a reciprocating cutter mounted therein and driven by an electric motor suspended below the sewing machine table. The vacuum box is hollow and the cutter is hollow so that as to permit the severed thread to pass therethrough to the suction outlet.
Inventors
- 👤 M Bray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:17
CPC Classifications
D; D05; D05B; D05B65/00; D05B65/06; D05D; D05D2207/00; D05D2207/02; D05D2207/04; Y; Y10; Y10S; Y10S112/00; Y10S112/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
A vacuum thread trimmer attachment for sewing machines of the type having a sewing table comprising a relatively thin elongate vacuum box detachably secured to said sewing table on the upper surface thereof, an electric motor secured to one end of said vacuum box and extending through said sewing table in depending relation to said vacuum box, a vacuum conduit communicating with and depending from said vacuum box and adapted to be connected to a source of vacuum, a cutter bar, means completely within said vacuum box supporting and guiding said cutter bar for longitudinal sliding reciprocation completely within said vacuum box, means on said motor within said vacuum box cooperating with means on said cutter bar for reciprocating said cutter bar, a cover detachably secured to said vacuum box, and cutting edges on said cover at the end thereof opposite said motor cooperating with cutting edges on said cutter bar for severing thread therebetween with said severed thread removed by said source of vacuum.
Claim 2
Dependent Claim
165 words
A vacuum thread trimmer attachment for sewing machines of the type having a sewing table comprising a relatively thin elongate vacuum box detachably secured to said sewing table on the upper surface thereof, an electric motor secured to one end of said vacuum box and extending through said sewing table in depending relation to said vacuum box, a vacuum conduit communicating with and depending from said vacuum box and adapted to be connected to a source of vacuum, a cutter bar, means completely within said vacuum box supporting and guiding said cutter bar for longitudinal sliding reciprocation completely within said vacuum box, means on said motor within said vacuum box cooperating with means on said cutter bar for reciprocating said cutter bar, a cover detachably secured to said vacuum box, and cutting edges on said cover at the end thereof opposite said motor cooperating with cutting edges on said cutter bar for severing thread therebetween with said severed thread removed by said source of vacuum.
Claim 3
Dependent Claim
41 words
A device as claimed in claim 1 wherein the cutting edges on said cover are spaced apart and guide means are provided on said vacuum box between said spaced apart cutters for guiding the threads to said spaced apart cutting edges.
Claim 4
Dependent Claim
20 words
A device as claimed in claim 2 wherein the cutting edges on said cutter bar are arranged in a V-shape.
Claim 5
Dependent Claim
25 words
A device as claimed in claim 3 wherein said cutter bar includes a hollow cutter blade with said cutting edges formed on said cutter blade.
Claim 6
Dependent Claim
44 words
A device as claimed in claim 1 wherein the means for reciprocating said cutter bar comprises a transverse slot in said cutter bar and a crank on said motor engaged in said transverse slot for reciprocating said cutter bar on rotation of said motor.
References Cited (Backward Citations)
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Cited
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |